Stefan Krah | ee3bac4 | 2020-02-24 11:15:26 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Memoryview object implementation |
| 3 | * -------------------------------- |
| 4 | * |
| 5 | * This implementation is a complete rewrite contributed by Stefan Krah in |
| 6 | * Python 3.3. Substantial credit goes to Antoine Pitrou (who had already |
| 7 | * fortified and rewritten the previous implementation) and Nick Coghlan |
| 8 | * (who came up with the idea of the ManagedBuffer) for analyzing the complex |
| 9 | * ownership rules. |
| 10 | * |
| 11 | */ |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 12 | |
| 13 | #include "Python.h" |
Victor Stinner | a15e260 | 2020-04-08 02:01:56 +0200 | [diff] [blame] | 14 | #include "pycore_abstract.h" // _PyIndex_Check() |
Victor Stinner | bcda8f1 | 2018-11-21 22:27:47 +0100 | [diff] [blame] | 15 | #include "pycore_object.h" |
Gregory P. Smith | 8cb6569 | 2015-04-25 23:22:26 +0000 | [diff] [blame] | 16 | #include "pystrhex.h" |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 17 | #include <stddef.h> |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 18 | |
Gregory P. Smith | 0c2f930 | 2019-05-29 11:46:58 -0700 | [diff] [blame] | 19 | /*[clinic input] |
| 20 | class memoryview "PyMemoryViewObject *" "&PyMemoryView_Type" |
| 21 | [clinic start generated code]*/ |
| 22 | /*[clinic end generated code: output=da39a3ee5e6b4b0d input=e2e49d2192835219]*/ |
| 23 | |
| 24 | #include "clinic/memoryobject.c.h" |
Antoine Pitrou | 6e6cc83 | 2010-09-09 12:59:39 +0000 | [diff] [blame] | 25 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 26 | /****************************************************************************/ |
| 27 | /* ManagedBuffer Object */ |
| 28 | /****************************************************************************/ |
| 29 | |
| 30 | /* |
| 31 | ManagedBuffer Object: |
| 32 | --------------------- |
| 33 | |
| 34 | The purpose of this object is to facilitate the handling of chained |
| 35 | memoryviews that have the same underlying exporting object. PEP-3118 |
| 36 | allows the underlying object to change while a view is exported. This |
| 37 | could lead to unexpected results when constructing a new memoryview |
| 38 | from an existing memoryview. |
| 39 | |
| 40 | Rather than repeatedly redirecting buffer requests to the original base |
| 41 | object, all chained memoryviews use a single buffer snapshot. This |
| 42 | snapshot is generated by the constructor _PyManagedBuffer_FromObject(). |
| 43 | |
| 44 | Ownership rules: |
| 45 | ---------------- |
| 46 | |
| 47 | The master buffer inside a managed buffer is filled in by the original |
| 48 | base object. shape, strides, suboffsets and format are read-only for |
| 49 | all consumers. |
| 50 | |
| 51 | A memoryview's buffer is a private copy of the exporter's buffer. shape, |
| 52 | strides and suboffsets belong to the memoryview and are thus writable. |
| 53 | |
| 54 | If a memoryview itself exports several buffers via memory_getbuf(), all |
| 55 | buffer copies share shape, strides and suboffsets. In this case, the |
| 56 | arrays are NOT writable. |
| 57 | |
| 58 | Reference count assumptions: |
| 59 | ---------------------------- |
| 60 | |
| 61 | The 'obj' member of a Py_buffer must either be NULL or refer to the |
| 62 | exporting base object. In the Python codebase, all getbufferprocs |
| 63 | return a new reference to view.obj (example: bytes_buffer_getbuffer()). |
| 64 | |
| 65 | PyBuffer_Release() decrements view.obj (if non-NULL), so the |
| 66 | releasebufferprocs must NOT decrement view.obj. |
| 67 | */ |
| 68 | |
| 69 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 70 | #define CHECK_MBUF_RELEASED(mbuf) \ |
| 71 | if (((_PyManagedBufferObject *)mbuf)->flags&_Py_MANAGED_BUFFER_RELEASED) { \ |
| 72 | PyErr_SetString(PyExc_ValueError, \ |
| 73 | "operation forbidden on released memoryview object"); \ |
| 74 | return NULL; \ |
Antoine Pitrou | 6e6cc83 | 2010-09-09 12:59:39 +0000 | [diff] [blame] | 75 | } |
| 76 | |
Antoine Pitrou | 6e6cc83 | 2010-09-09 12:59:39 +0000 | [diff] [blame] | 77 | |
Benjamin Peterson | 82cce4c | 2016-09-08 11:56:06 -0700 | [diff] [blame] | 78 | static inline _PyManagedBufferObject * |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 79 | mbuf_alloc(void) |
Antoine Pitrou | bc42040 | 2008-12-07 20:14:49 +0000 | [diff] [blame] | 80 | { |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 81 | _PyManagedBufferObject *mbuf; |
| 82 | |
| 83 | mbuf = (_PyManagedBufferObject *) |
| 84 | PyObject_GC_New(_PyManagedBufferObject, &_PyManagedBuffer_Type); |
| 85 | if (mbuf == NULL) |
| 86 | return NULL; |
| 87 | mbuf->flags = 0; |
| 88 | mbuf->exports = 0; |
| 89 | mbuf->master.obj = NULL; |
| 90 | _PyObject_GC_TRACK(mbuf); |
| 91 | |
| 92 | return mbuf; |
| 93 | } |
| 94 | |
| 95 | static PyObject * |
| 96 | _PyManagedBuffer_FromObject(PyObject *base) |
| 97 | { |
| 98 | _PyManagedBufferObject *mbuf; |
| 99 | |
| 100 | mbuf = mbuf_alloc(); |
| 101 | if (mbuf == NULL) |
| 102 | return NULL; |
| 103 | |
| 104 | if (PyObject_GetBuffer(base, &mbuf->master, PyBUF_FULL_RO) < 0) { |
Stefan Krah | 1649c1b | 2012-03-05 17:45:17 +0100 | [diff] [blame] | 105 | mbuf->master.obj = NULL; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 106 | Py_DECREF(mbuf); |
| 107 | return NULL; |
| 108 | } |
| 109 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 110 | return (PyObject *)mbuf; |
Antoine Pitrou | c3b3924 | 2009-01-03 16:59:18 +0000 | [diff] [blame] | 111 | } |
| 112 | |
| 113 | static void |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 114 | mbuf_release(_PyManagedBufferObject *self) |
Antoine Pitrou | c3b3924 | 2009-01-03 16:59:18 +0000 | [diff] [blame] | 115 | { |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 116 | if (self->flags&_Py_MANAGED_BUFFER_RELEASED) |
| 117 | return; |
| 118 | |
| 119 | /* NOTE: at this point self->exports can still be > 0 if this function |
| 120 | is called from mbuf_clear() to break up a reference cycle. */ |
| 121 | self->flags |= _Py_MANAGED_BUFFER_RELEASED; |
| 122 | |
| 123 | /* PyBuffer_Release() decrements master->obj and sets it to NULL. */ |
| 124 | _PyObject_GC_UNTRACK(self); |
| 125 | PyBuffer_Release(&self->master); |
| 126 | } |
| 127 | |
| 128 | static void |
| 129 | mbuf_dealloc(_PyManagedBufferObject *self) |
| 130 | { |
| 131 | assert(self->exports == 0); |
| 132 | mbuf_release(self); |
| 133 | if (self->flags&_Py_MANAGED_BUFFER_FREE_FORMAT) |
| 134 | PyMem_Free(self->master.format); |
| 135 | PyObject_GC_Del(self); |
Antoine Pitrou | bc42040 | 2008-12-07 20:14:49 +0000 | [diff] [blame] | 136 | } |
| 137 | |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 138 | static int |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 139 | mbuf_traverse(_PyManagedBufferObject *self, visitproc visit, void *arg) |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 140 | { |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 141 | Py_VISIT(self->master.obj); |
| 142 | return 0; |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 143 | } |
| 144 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 145 | static int |
| 146 | mbuf_clear(_PyManagedBufferObject *self) |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 147 | { |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 148 | assert(self->exports >= 0); |
| 149 | mbuf_release(self); |
| 150 | return 0; |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 151 | } |
| 152 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 153 | PyTypeObject _PyManagedBuffer_Type = { |
| 154 | PyVarObject_HEAD_INIT(&PyType_Type, 0) |
| 155 | "managedbuffer", |
| 156 | sizeof(_PyManagedBufferObject), |
| 157 | 0, |
| 158 | (destructor)mbuf_dealloc, /* tp_dealloc */ |
Jeroen Demeyer | 530f506 | 2019-05-31 04:13:39 +0200 | [diff] [blame] | 159 | 0, /* tp_vectorcall_offset */ |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 160 | 0, /* tp_getattr */ |
| 161 | 0, /* tp_setattr */ |
Jeroen Demeyer | 530f506 | 2019-05-31 04:13:39 +0200 | [diff] [blame] | 162 | 0, /* tp_as_async */ |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 163 | 0, /* tp_repr */ |
| 164 | 0, /* tp_as_number */ |
| 165 | 0, /* tp_as_sequence */ |
| 166 | 0, /* tp_as_mapping */ |
| 167 | 0, /* tp_hash */ |
| 168 | 0, /* tp_call */ |
| 169 | 0, /* tp_str */ |
| 170 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 171 | 0, /* tp_setattro */ |
| 172 | 0, /* tp_as_buffer */ |
| 173 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */ |
| 174 | 0, /* tp_doc */ |
| 175 | (traverseproc)mbuf_traverse, /* tp_traverse */ |
| 176 | (inquiry)mbuf_clear /* tp_clear */ |
| 177 | }; |
| 178 | |
| 179 | |
| 180 | /****************************************************************************/ |
| 181 | /* MemoryView Object */ |
| 182 | /****************************************************************************/ |
| 183 | |
| 184 | /* In the process of breaking reference cycles mbuf_release() can be |
| 185 | called before memory_release(). */ |
| 186 | #define BASE_INACCESSIBLE(mv) \ |
| 187 | (((PyMemoryViewObject *)mv)->flags&_Py_MEMORYVIEW_RELEASED || \ |
| 188 | ((PyMemoryViewObject *)mv)->mbuf->flags&_Py_MANAGED_BUFFER_RELEASED) |
| 189 | |
| 190 | #define CHECK_RELEASED(mv) \ |
| 191 | if (BASE_INACCESSIBLE(mv)) { \ |
| 192 | PyErr_SetString(PyExc_ValueError, \ |
| 193 | "operation forbidden on released memoryview object"); \ |
| 194 | return NULL; \ |
| 195 | } |
| 196 | |
| 197 | #define CHECK_RELEASED_INT(mv) \ |
| 198 | if (BASE_INACCESSIBLE(mv)) { \ |
| 199 | PyErr_SetString(PyExc_ValueError, \ |
| 200 | "operation forbidden on released memoryview object"); \ |
| 201 | return -1; \ |
| 202 | } |
| 203 | |
| 204 | #define CHECK_LIST_OR_TUPLE(v) \ |
| 205 | if (!PyList_Check(v) && !PyTuple_Check(v)) { \ |
| 206 | PyErr_SetString(PyExc_TypeError, \ |
| 207 | #v " must be a list or a tuple"); \ |
| 208 | return NULL; \ |
| 209 | } |
| 210 | |
| 211 | #define VIEW_ADDR(mv) (&((PyMemoryViewObject *)mv)->view) |
| 212 | |
| 213 | /* Check for the presence of suboffsets in the first dimension. */ |
Antoine Pitrou | 31084ba | 2015-03-19 23:29:36 +0100 | [diff] [blame] | 214 | #define HAVE_PTR(suboffsets, dim) (suboffsets && suboffsets[dim] >= 0) |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 215 | /* Adjust ptr if suboffsets are present. */ |
Antoine Pitrou | 31084ba | 2015-03-19 23:29:36 +0100 | [diff] [blame] | 216 | #define ADJUST_PTR(ptr, suboffsets, dim) \ |
| 217 | (HAVE_PTR(suboffsets, dim) ? *((char**)ptr) + suboffsets[dim] : ptr) |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 218 | |
| 219 | /* Memoryview buffer properties */ |
| 220 | #define MV_C_CONTIGUOUS(flags) (flags&(_Py_MEMORYVIEW_SCALAR|_Py_MEMORYVIEW_C)) |
| 221 | #define MV_F_CONTIGUOUS(flags) \ |
| 222 | (flags&(_Py_MEMORYVIEW_SCALAR|_Py_MEMORYVIEW_FORTRAN)) |
| 223 | #define MV_ANY_CONTIGUOUS(flags) \ |
| 224 | (flags&(_Py_MEMORYVIEW_SCALAR|_Py_MEMORYVIEW_C|_Py_MEMORYVIEW_FORTRAN)) |
| 225 | |
| 226 | /* Fast contiguity test. Caller must ensure suboffsets==NULL and ndim==1. */ |
| 227 | #define MV_CONTIGUOUS_NDIM1(view) \ |
| 228 | ((view)->shape[0] == 1 || (view)->strides[0] == (view)->itemsize) |
| 229 | |
| 230 | /* getbuffer() requests */ |
| 231 | #define REQ_INDIRECT(flags) ((flags&PyBUF_INDIRECT) == PyBUF_INDIRECT) |
| 232 | #define REQ_C_CONTIGUOUS(flags) ((flags&PyBUF_C_CONTIGUOUS) == PyBUF_C_CONTIGUOUS) |
| 233 | #define REQ_F_CONTIGUOUS(flags) ((flags&PyBUF_F_CONTIGUOUS) == PyBUF_F_CONTIGUOUS) |
| 234 | #define REQ_ANY_CONTIGUOUS(flags) ((flags&PyBUF_ANY_CONTIGUOUS) == PyBUF_ANY_CONTIGUOUS) |
| 235 | #define REQ_STRIDES(flags) ((flags&PyBUF_STRIDES) == PyBUF_STRIDES) |
| 236 | #define REQ_SHAPE(flags) ((flags&PyBUF_ND) == PyBUF_ND) |
| 237 | #define REQ_WRITABLE(flags) (flags&PyBUF_WRITABLE) |
| 238 | #define REQ_FORMAT(flags) (flags&PyBUF_FORMAT) |
| 239 | |
| 240 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 241 | /**************************************************************************/ |
| 242 | /* Copy memoryview buffers */ |
| 243 | /**************************************************************************/ |
| 244 | |
| 245 | /* The functions in this section take a source and a destination buffer |
| 246 | with the same logical structure: format, itemsize, ndim and shape |
| 247 | are identical, with ndim > 0. |
| 248 | |
| 249 | NOTE: All buffers are assumed to have PyBUF_FULL information, which |
| 250 | is the case for memoryviews! */ |
| 251 | |
| 252 | |
| 253 | /* Assumptions: ndim >= 1. The macro tests for a corner case that should |
| 254 | perhaps be explicitly forbidden in the PEP. */ |
| 255 | #define HAVE_SUBOFFSETS_IN_LAST_DIM(view) \ |
| 256 | (view->suboffsets && view->suboffsets[dest->ndim-1] >= 0) |
| 257 | |
Benjamin Peterson | 82cce4c | 2016-09-08 11:56:06 -0700 | [diff] [blame] | 258 | static inline int |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 259 | last_dim_is_contiguous(const Py_buffer *dest, const Py_buffer *src) |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 260 | { |
| 261 | assert(dest->ndim > 0 && src->ndim > 0); |
| 262 | return (!HAVE_SUBOFFSETS_IN_LAST_DIM(dest) && |
| 263 | !HAVE_SUBOFFSETS_IN_LAST_DIM(src) && |
| 264 | dest->strides[dest->ndim-1] == dest->itemsize && |
| 265 | src->strides[src->ndim-1] == src->itemsize); |
| 266 | } |
| 267 | |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 268 | /* This is not a general function for determining format equivalence. |
| 269 | It is used in copy_single() and copy_buffer() to weed out non-matching |
| 270 | formats. Skipping the '@' character is specifically used in slice |
| 271 | assignments, where the lvalue is already known to have a single character |
| 272 | format. This is a performance hack that could be rewritten (if properly |
| 273 | benchmarked). */ |
Benjamin Peterson | 82cce4c | 2016-09-08 11:56:06 -0700 | [diff] [blame] | 274 | static inline int |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 275 | equiv_format(const Py_buffer *dest, const Py_buffer *src) |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 276 | { |
| 277 | const char *dfmt, *sfmt; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 278 | |
| 279 | assert(dest->format && src->format); |
| 280 | dfmt = dest->format[0] == '@' ? dest->format+1 : dest->format; |
| 281 | sfmt = src->format[0] == '@' ? src->format+1 : src->format; |
| 282 | |
| 283 | if (strcmp(dfmt, sfmt) != 0 || |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 284 | dest->itemsize != src->itemsize) { |
| 285 | return 0; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 286 | } |
| 287 | |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 288 | return 1; |
| 289 | } |
| 290 | |
| 291 | /* Two shapes are equivalent if they are either equal or identical up |
| 292 | to a zero element at the same position. For example, in NumPy arrays |
| 293 | the shapes [1, 0, 5] and [1, 0, 7] are equivalent. */ |
Benjamin Peterson | 82cce4c | 2016-09-08 11:56:06 -0700 | [diff] [blame] | 294 | static inline int |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 295 | equiv_shape(const Py_buffer *dest, const Py_buffer *src) |
| 296 | { |
| 297 | int i; |
| 298 | |
| 299 | if (dest->ndim != src->ndim) |
| 300 | return 0; |
| 301 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 302 | for (i = 0; i < dest->ndim; i++) { |
| 303 | if (dest->shape[i] != src->shape[i]) |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 304 | return 0; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 305 | if (dest->shape[i] == 0) |
| 306 | break; |
| 307 | } |
| 308 | |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 309 | return 1; |
| 310 | } |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 311 | |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 312 | /* Check that the logical structure of the destination and source buffers |
| 313 | is identical. */ |
| 314 | static int |
| 315 | equiv_structure(const Py_buffer *dest, const Py_buffer *src) |
| 316 | { |
| 317 | if (!equiv_format(dest, src) || |
| 318 | !equiv_shape(dest, src)) { |
| 319 | PyErr_SetString(PyExc_ValueError, |
Stefan Krah | 674a42b | 2013-02-19 13:44:49 +0100 | [diff] [blame] | 320 | "memoryview assignment: lvalue and rvalue have different " |
| 321 | "structures"); |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 322 | return 0; |
| 323 | } |
| 324 | |
| 325 | return 1; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 326 | } |
| 327 | |
| 328 | /* Base case for recursive multi-dimensional copying. Contiguous arrays are |
| 329 | copied with very little overhead. Assumptions: ndim == 1, mem == NULL or |
| 330 | sizeof(mem) == shape[0] * itemsize. */ |
| 331 | static void |
| 332 | copy_base(const Py_ssize_t *shape, Py_ssize_t itemsize, |
| 333 | char *dptr, const Py_ssize_t *dstrides, const Py_ssize_t *dsuboffsets, |
| 334 | char *sptr, const Py_ssize_t *sstrides, const Py_ssize_t *ssuboffsets, |
| 335 | char *mem) |
| 336 | { |
| 337 | if (mem == NULL) { /* contiguous */ |
| 338 | Py_ssize_t size = shape[0] * itemsize; |
| 339 | if (dptr + size < sptr || sptr + size < dptr) |
| 340 | memcpy(dptr, sptr, size); /* no overlapping */ |
| 341 | else |
| 342 | memmove(dptr, sptr, size); |
| 343 | } |
| 344 | else { |
| 345 | char *p; |
| 346 | Py_ssize_t i; |
| 347 | for (i=0, p=mem; i < shape[0]; p+=itemsize, sptr+=sstrides[0], i++) { |
Antoine Pitrou | 31084ba | 2015-03-19 23:29:36 +0100 | [diff] [blame] | 348 | char *xsptr = ADJUST_PTR(sptr, ssuboffsets, 0); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 349 | memcpy(p, xsptr, itemsize); |
| 350 | } |
| 351 | for (i=0, p=mem; i < shape[0]; p+=itemsize, dptr+=dstrides[0], i++) { |
Antoine Pitrou | 31084ba | 2015-03-19 23:29:36 +0100 | [diff] [blame] | 352 | char *xdptr = ADJUST_PTR(dptr, dsuboffsets, 0); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 353 | memcpy(xdptr, p, itemsize); |
| 354 | } |
| 355 | } |
| 356 | |
| 357 | } |
| 358 | |
| 359 | /* Recursively copy a source buffer to a destination buffer. The two buffers |
| 360 | have the same ndim, shape and itemsize. */ |
| 361 | static void |
| 362 | copy_rec(const Py_ssize_t *shape, Py_ssize_t ndim, Py_ssize_t itemsize, |
| 363 | char *dptr, const Py_ssize_t *dstrides, const Py_ssize_t *dsuboffsets, |
| 364 | char *sptr, const Py_ssize_t *sstrides, const Py_ssize_t *ssuboffsets, |
| 365 | char *mem) |
| 366 | { |
| 367 | Py_ssize_t i; |
| 368 | |
| 369 | assert(ndim >= 1); |
| 370 | |
| 371 | if (ndim == 1) { |
| 372 | copy_base(shape, itemsize, |
| 373 | dptr, dstrides, dsuboffsets, |
| 374 | sptr, sstrides, ssuboffsets, |
| 375 | mem); |
| 376 | return; |
| 377 | } |
| 378 | |
| 379 | for (i = 0; i < shape[0]; dptr+=dstrides[0], sptr+=sstrides[0], i++) { |
Antoine Pitrou | 31084ba | 2015-03-19 23:29:36 +0100 | [diff] [blame] | 380 | char *xdptr = ADJUST_PTR(dptr, dsuboffsets, 0); |
| 381 | char *xsptr = ADJUST_PTR(sptr, ssuboffsets, 0); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 382 | |
| 383 | copy_rec(shape+1, ndim-1, itemsize, |
| 384 | xdptr, dstrides+1, dsuboffsets ? dsuboffsets+1 : NULL, |
| 385 | xsptr, sstrides+1, ssuboffsets ? ssuboffsets+1 : NULL, |
| 386 | mem); |
| 387 | } |
| 388 | } |
| 389 | |
| 390 | /* Faster copying of one-dimensional arrays. */ |
| 391 | static int |
| 392 | copy_single(Py_buffer *dest, Py_buffer *src) |
| 393 | { |
| 394 | char *mem = NULL; |
| 395 | |
| 396 | assert(dest->ndim == 1); |
| 397 | |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 398 | if (!equiv_structure(dest, src)) |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 399 | return -1; |
| 400 | |
| 401 | if (!last_dim_is_contiguous(dest, src)) { |
| 402 | mem = PyMem_Malloc(dest->shape[0] * dest->itemsize); |
| 403 | if (mem == NULL) { |
| 404 | PyErr_NoMemory(); |
| 405 | return -1; |
| 406 | } |
| 407 | } |
| 408 | |
| 409 | copy_base(dest->shape, dest->itemsize, |
| 410 | dest->buf, dest->strides, dest->suboffsets, |
| 411 | src->buf, src->strides, src->suboffsets, |
| 412 | mem); |
| 413 | |
| 414 | if (mem) |
| 415 | PyMem_Free(mem); |
| 416 | |
| 417 | return 0; |
| 418 | } |
| 419 | |
| 420 | /* Recursively copy src to dest. Both buffers must have the same basic |
| 421 | structure. Copying is atomic, the function never fails with a partial |
| 422 | copy. */ |
| 423 | static int |
| 424 | copy_buffer(Py_buffer *dest, Py_buffer *src) |
| 425 | { |
| 426 | char *mem = NULL; |
| 427 | |
| 428 | assert(dest->ndim > 0); |
| 429 | |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 430 | if (!equiv_structure(dest, src)) |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 431 | return -1; |
| 432 | |
| 433 | if (!last_dim_is_contiguous(dest, src)) { |
| 434 | mem = PyMem_Malloc(dest->shape[dest->ndim-1] * dest->itemsize); |
| 435 | if (mem == NULL) { |
| 436 | PyErr_NoMemory(); |
| 437 | return -1; |
| 438 | } |
| 439 | } |
| 440 | |
| 441 | copy_rec(dest->shape, dest->ndim, dest->itemsize, |
| 442 | dest->buf, dest->strides, dest->suboffsets, |
| 443 | src->buf, src->strides, src->suboffsets, |
| 444 | mem); |
| 445 | |
| 446 | if (mem) |
| 447 | PyMem_Free(mem); |
| 448 | |
| 449 | return 0; |
| 450 | } |
| 451 | |
| 452 | /* Initialize strides for a C-contiguous array. */ |
Benjamin Peterson | 82cce4c | 2016-09-08 11:56:06 -0700 | [diff] [blame] | 453 | static inline void |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 454 | init_strides_from_shape(Py_buffer *view) |
| 455 | { |
| 456 | Py_ssize_t i; |
| 457 | |
| 458 | assert(view->ndim > 0); |
| 459 | |
| 460 | view->strides[view->ndim-1] = view->itemsize; |
| 461 | for (i = view->ndim-2; i >= 0; i--) |
| 462 | view->strides[i] = view->strides[i+1] * view->shape[i+1]; |
| 463 | } |
| 464 | |
| 465 | /* Initialize strides for a Fortran-contiguous array. */ |
Benjamin Peterson | 82cce4c | 2016-09-08 11:56:06 -0700 | [diff] [blame] | 466 | static inline void |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 467 | init_fortran_strides_from_shape(Py_buffer *view) |
| 468 | { |
| 469 | Py_ssize_t i; |
| 470 | |
| 471 | assert(view->ndim > 0); |
| 472 | |
| 473 | view->strides[0] = view->itemsize; |
| 474 | for (i = 1; i < view->ndim; i++) |
| 475 | view->strides[i] = view->strides[i-1] * view->shape[i-1]; |
| 476 | } |
| 477 | |
Stefan Krah | 7d12d9d | 2012-07-28 12:25:55 +0200 | [diff] [blame] | 478 | /* Copy src to a contiguous representation. order is one of 'C', 'F' (Fortran) |
| 479 | or 'A' (Any). Assumptions: src has PyBUF_FULL information, src->ndim >= 1, |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 480 | len(mem) == src->len. */ |
| 481 | static int |
Stefan Krah | 7d12d9d | 2012-07-28 12:25:55 +0200 | [diff] [blame] | 482 | buffer_to_contiguous(char *mem, Py_buffer *src, char order) |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 483 | { |
| 484 | Py_buffer dest; |
| 485 | Py_ssize_t *strides; |
| 486 | int ret; |
| 487 | |
Stefan Krah | 7d12d9d | 2012-07-28 12:25:55 +0200 | [diff] [blame] | 488 | assert(src->ndim >= 1); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 489 | assert(src->shape != NULL); |
| 490 | assert(src->strides != NULL); |
| 491 | |
| 492 | strides = PyMem_Malloc(src->ndim * (sizeof *src->strides)); |
| 493 | if (strides == NULL) { |
| 494 | PyErr_NoMemory(); |
| 495 | return -1; |
| 496 | } |
| 497 | |
Stefan Krah | 7d12d9d | 2012-07-28 12:25:55 +0200 | [diff] [blame] | 498 | /* initialize dest */ |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 499 | dest = *src; |
| 500 | dest.buf = mem; |
Stefan Krah | 7d12d9d | 2012-07-28 12:25:55 +0200 | [diff] [blame] | 501 | /* shape is constant and shared: the logical representation of the |
| 502 | array is unaltered. */ |
| 503 | |
| 504 | /* The physical representation determined by strides (and possibly |
| 505 | suboffsets) may change. */ |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 506 | dest.strides = strides; |
Stefan Krah | 7d12d9d | 2012-07-28 12:25:55 +0200 | [diff] [blame] | 507 | if (order == 'C' || order == 'A') { |
| 508 | init_strides_from_shape(&dest); |
| 509 | } |
| 510 | else { |
| 511 | init_fortran_strides_from_shape(&dest); |
| 512 | } |
| 513 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 514 | dest.suboffsets = NULL; |
| 515 | |
| 516 | ret = copy_buffer(&dest, src); |
| 517 | |
| 518 | PyMem_Free(strides); |
| 519 | return ret; |
| 520 | } |
| 521 | |
| 522 | |
| 523 | /****************************************************************************/ |
| 524 | /* Constructors */ |
| 525 | /****************************************************************************/ |
| 526 | |
| 527 | /* Initialize values that are shared with the managed buffer. */ |
Benjamin Peterson | 82cce4c | 2016-09-08 11:56:06 -0700 | [diff] [blame] | 528 | static inline void |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 529 | init_shared_values(Py_buffer *dest, const Py_buffer *src) |
| 530 | { |
| 531 | dest->obj = src->obj; |
| 532 | dest->buf = src->buf; |
| 533 | dest->len = src->len; |
| 534 | dest->itemsize = src->itemsize; |
| 535 | dest->readonly = src->readonly; |
| 536 | dest->format = src->format ? src->format : "B"; |
| 537 | dest->internal = src->internal; |
| 538 | } |
| 539 | |
| 540 | /* Copy shape and strides. Reconstruct missing values. */ |
| 541 | static void |
| 542 | init_shape_strides(Py_buffer *dest, const Py_buffer *src) |
| 543 | { |
| 544 | Py_ssize_t i; |
| 545 | |
| 546 | if (src->ndim == 0) { |
| 547 | dest->shape = NULL; |
| 548 | dest->strides = NULL; |
| 549 | return; |
| 550 | } |
| 551 | if (src->ndim == 1) { |
| 552 | dest->shape[0] = src->shape ? src->shape[0] : src->len / src->itemsize; |
| 553 | dest->strides[0] = src->strides ? src->strides[0] : src->itemsize; |
| 554 | return; |
| 555 | } |
| 556 | |
| 557 | for (i = 0; i < src->ndim; i++) |
| 558 | dest->shape[i] = src->shape[i]; |
| 559 | if (src->strides) { |
| 560 | for (i = 0; i < src->ndim; i++) |
| 561 | dest->strides[i] = src->strides[i]; |
| 562 | } |
| 563 | else { |
| 564 | init_strides_from_shape(dest); |
| 565 | } |
| 566 | } |
| 567 | |
Benjamin Peterson | 82cce4c | 2016-09-08 11:56:06 -0700 | [diff] [blame] | 568 | static inline void |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 569 | init_suboffsets(Py_buffer *dest, const Py_buffer *src) |
| 570 | { |
| 571 | Py_ssize_t i; |
| 572 | |
| 573 | if (src->suboffsets == NULL) { |
| 574 | dest->suboffsets = NULL; |
| 575 | return; |
| 576 | } |
| 577 | for (i = 0; i < src->ndim; i++) |
| 578 | dest->suboffsets[i] = src->suboffsets[i]; |
| 579 | } |
| 580 | |
| 581 | /* len = product(shape) * itemsize */ |
Benjamin Peterson | 82cce4c | 2016-09-08 11:56:06 -0700 | [diff] [blame] | 582 | static inline void |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 583 | init_len(Py_buffer *view) |
| 584 | { |
| 585 | Py_ssize_t i, len; |
| 586 | |
| 587 | len = 1; |
| 588 | for (i = 0; i < view->ndim; i++) |
| 589 | len *= view->shape[i]; |
| 590 | len *= view->itemsize; |
| 591 | |
| 592 | view->len = len; |
| 593 | } |
| 594 | |
| 595 | /* Initialize memoryview buffer properties. */ |
| 596 | static void |
| 597 | init_flags(PyMemoryViewObject *mv) |
| 598 | { |
| 599 | const Py_buffer *view = &mv->view; |
| 600 | int flags = 0; |
| 601 | |
| 602 | switch (view->ndim) { |
| 603 | case 0: |
| 604 | flags |= (_Py_MEMORYVIEW_SCALAR|_Py_MEMORYVIEW_C| |
| 605 | _Py_MEMORYVIEW_FORTRAN); |
| 606 | break; |
| 607 | case 1: |
| 608 | if (MV_CONTIGUOUS_NDIM1(view)) |
| 609 | flags |= (_Py_MEMORYVIEW_C|_Py_MEMORYVIEW_FORTRAN); |
| 610 | break; |
| 611 | default: |
| 612 | if (PyBuffer_IsContiguous(view, 'C')) |
| 613 | flags |= _Py_MEMORYVIEW_C; |
| 614 | if (PyBuffer_IsContiguous(view, 'F')) |
| 615 | flags |= _Py_MEMORYVIEW_FORTRAN; |
| 616 | break; |
| 617 | } |
| 618 | |
| 619 | if (view->suboffsets) { |
| 620 | flags |= _Py_MEMORYVIEW_PIL; |
| 621 | flags &= ~(_Py_MEMORYVIEW_C|_Py_MEMORYVIEW_FORTRAN); |
| 622 | } |
| 623 | |
| 624 | mv->flags = flags; |
| 625 | } |
| 626 | |
| 627 | /* Allocate a new memoryview and perform basic initialization. New memoryviews |
| 628 | are exclusively created through the mbuf_add functions. */ |
Benjamin Peterson | 82cce4c | 2016-09-08 11:56:06 -0700 | [diff] [blame] | 629 | static inline PyMemoryViewObject * |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 630 | memory_alloc(int ndim) |
| 631 | { |
| 632 | PyMemoryViewObject *mv; |
| 633 | |
| 634 | mv = (PyMemoryViewObject *) |
| 635 | PyObject_GC_NewVar(PyMemoryViewObject, &PyMemoryView_Type, 3*ndim); |
| 636 | if (mv == NULL) |
| 637 | return NULL; |
| 638 | |
| 639 | mv->mbuf = NULL; |
| 640 | mv->hash = -1; |
| 641 | mv->flags = 0; |
| 642 | mv->exports = 0; |
| 643 | mv->view.ndim = ndim; |
| 644 | mv->view.shape = mv->ob_array; |
| 645 | mv->view.strides = mv->ob_array + ndim; |
| 646 | mv->view.suboffsets = mv->ob_array + 2 * ndim; |
Richard Oudkerk | 3e0a1eb | 2012-05-28 21:35:09 +0100 | [diff] [blame] | 647 | mv->weakreflist = NULL; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 648 | |
| 649 | _PyObject_GC_TRACK(mv); |
| 650 | return mv; |
| 651 | } |
| 652 | |
| 653 | /* |
| 654 | Return a new memoryview that is registered with mbuf. If src is NULL, |
| 655 | use mbuf->master as the underlying buffer. Otherwise, use src. |
| 656 | |
| 657 | The new memoryview has full buffer information: shape and strides |
| 658 | are always present, suboffsets as needed. Arrays are copied to |
| 659 | the memoryview's ob_array field. |
| 660 | */ |
| 661 | static PyObject * |
| 662 | mbuf_add_view(_PyManagedBufferObject *mbuf, const Py_buffer *src) |
| 663 | { |
| 664 | PyMemoryViewObject *mv; |
| 665 | Py_buffer *dest; |
| 666 | |
| 667 | if (src == NULL) |
| 668 | src = &mbuf->master; |
| 669 | |
| 670 | if (src->ndim > PyBUF_MAX_NDIM) { |
| 671 | PyErr_SetString(PyExc_ValueError, |
| 672 | "memoryview: number of dimensions must not exceed " |
Victor Stinner | 45e8e2f | 2014-05-14 17:24:35 +0200 | [diff] [blame] | 673 | Py_STRINGIFY(PyBUF_MAX_NDIM)); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 674 | return NULL; |
| 675 | } |
| 676 | |
| 677 | mv = memory_alloc(src->ndim); |
| 678 | if (mv == NULL) |
| 679 | return NULL; |
| 680 | |
| 681 | dest = &mv->view; |
| 682 | init_shared_values(dest, src); |
| 683 | init_shape_strides(dest, src); |
| 684 | init_suboffsets(dest, src); |
| 685 | init_flags(mv); |
| 686 | |
| 687 | mv->mbuf = mbuf; |
| 688 | Py_INCREF(mbuf); |
| 689 | mbuf->exports++; |
| 690 | |
| 691 | return (PyObject *)mv; |
| 692 | } |
| 693 | |
| 694 | /* Register an incomplete view: shape, strides, suboffsets and flags still |
| 695 | need to be initialized. Use 'ndim' instead of src->ndim to determine the |
| 696 | size of the memoryview's ob_array. |
| 697 | |
| 698 | Assumption: ndim <= PyBUF_MAX_NDIM. */ |
| 699 | static PyObject * |
| 700 | mbuf_add_incomplete_view(_PyManagedBufferObject *mbuf, const Py_buffer *src, |
| 701 | int ndim) |
| 702 | { |
| 703 | PyMemoryViewObject *mv; |
| 704 | Py_buffer *dest; |
| 705 | |
| 706 | if (src == NULL) |
| 707 | src = &mbuf->master; |
| 708 | |
| 709 | assert(ndim <= PyBUF_MAX_NDIM); |
| 710 | |
| 711 | mv = memory_alloc(ndim); |
| 712 | if (mv == NULL) |
| 713 | return NULL; |
| 714 | |
| 715 | dest = &mv->view; |
| 716 | init_shared_values(dest, src); |
| 717 | |
| 718 | mv->mbuf = mbuf; |
| 719 | Py_INCREF(mbuf); |
| 720 | mbuf->exports++; |
| 721 | |
| 722 | return (PyObject *)mv; |
| 723 | } |
| 724 | |
| 725 | /* Expose a raw memory area as a view of contiguous bytes. flags can be |
| 726 | PyBUF_READ or PyBUF_WRITE. view->format is set to "B" (unsigned bytes). |
| 727 | The memoryview has complete buffer information. */ |
| 728 | PyObject * |
| 729 | PyMemoryView_FromMemory(char *mem, Py_ssize_t size, int flags) |
| 730 | { |
| 731 | _PyManagedBufferObject *mbuf; |
| 732 | PyObject *mv; |
| 733 | int readonly; |
| 734 | |
| 735 | assert(mem != NULL); |
| 736 | assert(flags == PyBUF_READ || flags == PyBUF_WRITE); |
| 737 | |
| 738 | mbuf = mbuf_alloc(); |
| 739 | if (mbuf == NULL) |
| 740 | return NULL; |
| 741 | |
| 742 | readonly = (flags == PyBUF_WRITE) ? 0 : 1; |
| 743 | (void)PyBuffer_FillInfo(&mbuf->master, NULL, mem, size, readonly, |
| 744 | PyBUF_FULL_RO); |
| 745 | |
| 746 | mv = mbuf_add_view(mbuf, NULL); |
| 747 | Py_DECREF(mbuf); |
| 748 | |
| 749 | return mv; |
| 750 | } |
| 751 | |
| 752 | /* Create a memoryview from a given Py_buffer. For simple byte views, |
| 753 | PyMemoryView_FromMemory() should be used instead. |
| 754 | This function is the only entry point that can create a master buffer |
| 755 | without full information. Because of this fact init_shape_strides() |
| 756 | must be able to reconstruct missing values. */ |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 757 | PyObject * |
Antoine Pitrou | ee58fa4 | 2008-08-19 18:22:14 +0000 | [diff] [blame] | 758 | PyMemoryView_FromBuffer(Py_buffer *info) |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 759 | { |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 760 | _PyManagedBufferObject *mbuf; |
| 761 | PyObject *mv; |
Travis E. Oliphant | 8ae62b6 | 2007-09-23 02:00:13 +0000 | [diff] [blame] | 762 | |
Antoine Pitrou | 5bffa79 | 2011-02-24 20:50:49 +0000 | [diff] [blame] | 763 | if (info->buf == NULL) { |
| 764 | PyErr_SetString(PyExc_ValueError, |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 765 | "PyMemoryView_FromBuffer(): info->buf must not be NULL"); |
Antoine Pitrou | 5bffa79 | 2011-02-24 20:50:49 +0000 | [diff] [blame] | 766 | return NULL; |
| 767 | } |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 768 | |
| 769 | mbuf = mbuf_alloc(); |
| 770 | if (mbuf == NULL) |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 771 | return NULL; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 772 | |
| 773 | /* info->obj is either NULL or a borrowed reference. This reference |
| 774 | should not be decremented in PyBuffer_Release(). */ |
| 775 | mbuf->master = *info; |
| 776 | mbuf->master.obj = NULL; |
| 777 | |
| 778 | mv = mbuf_add_view(mbuf, NULL); |
| 779 | Py_DECREF(mbuf); |
| 780 | |
| 781 | return mv; |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 782 | } |
| 783 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 784 | /* Create a memoryview from an object that implements the buffer protocol. |
| 785 | If the object is a memoryview, the new memoryview must be registered |
| 786 | with the same managed buffer. Otherwise, a new managed buffer is created. */ |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 787 | PyObject * |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 788 | PyMemoryView_FromObject(PyObject *v) |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 789 | { |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 790 | _PyManagedBufferObject *mbuf; |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 791 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 792 | if (PyMemoryView_Check(v)) { |
| 793 | PyMemoryViewObject *mv = (PyMemoryViewObject *)v; |
| 794 | CHECK_RELEASED(mv); |
| 795 | return mbuf_add_view(mv->mbuf, &mv->view); |
| 796 | } |
| 797 | else if (PyObject_CheckBuffer(v)) { |
| 798 | PyObject *ret; |
| 799 | mbuf = (_PyManagedBufferObject *)_PyManagedBuffer_FromObject(v); |
| 800 | if (mbuf == NULL) |
| 801 | return NULL; |
| 802 | ret = mbuf_add_view(mbuf, NULL); |
| 803 | Py_DECREF(mbuf); |
| 804 | return ret; |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 805 | } |
Guido van Rossum | 5dde61d | 2007-09-25 22:10:05 +0000 | [diff] [blame] | 806 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 807 | PyErr_Format(PyExc_TypeError, |
R David Murray | 861470c | 2014-10-05 11:47:01 -0400 | [diff] [blame] | 808 | "memoryview: a bytes-like object is required, not '%.200s'", |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 809 | Py_TYPE(v)->tp_name); |
| 810 | return NULL; |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 811 | } |
| 812 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 813 | /* Copy the format string from a base object that might vanish. */ |
| 814 | static int |
| 815 | mbuf_copy_format(_PyManagedBufferObject *mbuf, const char *fmt) |
| 816 | { |
| 817 | if (fmt != NULL) { |
| 818 | char *cp = PyMem_Malloc(strlen(fmt)+1); |
| 819 | if (cp == NULL) { |
| 820 | PyErr_NoMemory(); |
| 821 | return -1; |
| 822 | } |
| 823 | mbuf->master.format = strcpy(cp, fmt); |
| 824 | mbuf->flags |= _Py_MANAGED_BUFFER_FREE_FORMAT; |
| 825 | } |
| 826 | |
| 827 | return 0; |
| 828 | } |
| 829 | |
| 830 | /* |
| 831 | Return a memoryview that is based on a contiguous copy of src. |
| 832 | Assumptions: src has PyBUF_FULL_RO information, src->ndim > 0. |
| 833 | |
| 834 | Ownership rules: |
| 835 | 1) As usual, the returned memoryview has a private copy |
| 836 | of src->shape, src->strides and src->suboffsets. |
| 837 | 2) src->format is copied to the master buffer and released |
| 838 | in mbuf_dealloc(). The releasebufferproc of the bytes |
| 839 | object is NULL, so it does not matter that mbuf_release() |
| 840 | passes the altered format pointer to PyBuffer_Release(). |
| 841 | */ |
| 842 | static PyObject * |
| 843 | memory_from_contiguous_copy(Py_buffer *src, char order) |
| 844 | { |
| 845 | _PyManagedBufferObject *mbuf; |
| 846 | PyMemoryViewObject *mv; |
| 847 | PyObject *bytes; |
| 848 | Py_buffer *dest; |
| 849 | int i; |
| 850 | |
| 851 | assert(src->ndim > 0); |
| 852 | assert(src->shape != NULL); |
| 853 | |
| 854 | bytes = PyBytes_FromStringAndSize(NULL, src->len); |
| 855 | if (bytes == NULL) |
| 856 | return NULL; |
| 857 | |
| 858 | mbuf = (_PyManagedBufferObject *)_PyManagedBuffer_FromObject(bytes); |
| 859 | Py_DECREF(bytes); |
| 860 | if (mbuf == NULL) |
| 861 | return NULL; |
| 862 | |
| 863 | if (mbuf_copy_format(mbuf, src->format) < 0) { |
| 864 | Py_DECREF(mbuf); |
| 865 | return NULL; |
| 866 | } |
| 867 | |
| 868 | mv = (PyMemoryViewObject *)mbuf_add_incomplete_view(mbuf, NULL, src->ndim); |
| 869 | Py_DECREF(mbuf); |
| 870 | if (mv == NULL) |
| 871 | return NULL; |
| 872 | |
| 873 | dest = &mv->view; |
| 874 | |
| 875 | /* shared values are initialized correctly except for itemsize */ |
| 876 | dest->itemsize = src->itemsize; |
| 877 | |
| 878 | /* shape and strides */ |
| 879 | for (i = 0; i < src->ndim; i++) { |
| 880 | dest->shape[i] = src->shape[i]; |
| 881 | } |
| 882 | if (order == 'C' || order == 'A') { |
| 883 | init_strides_from_shape(dest); |
| 884 | } |
| 885 | else { |
| 886 | init_fortran_strides_from_shape(dest); |
| 887 | } |
| 888 | /* suboffsets */ |
| 889 | dest->suboffsets = NULL; |
| 890 | |
| 891 | /* flags */ |
| 892 | init_flags(mv); |
| 893 | |
| 894 | if (copy_buffer(dest, src) < 0) { |
| 895 | Py_DECREF(mv); |
| 896 | return NULL; |
| 897 | } |
| 898 | |
| 899 | return (PyObject *)mv; |
| 900 | } |
| 901 | |
| 902 | /* |
| 903 | Return a new memoryview object based on a contiguous exporter with |
| 904 | buffertype={PyBUF_READ, PyBUF_WRITE} and order={'C', 'F'ortran, or 'A'ny}. |
| 905 | The logical structure of the input and output buffers is the same |
| 906 | (i.e. tolist(input) == tolist(output)), but the physical layout in |
| 907 | memory can be explicitly chosen. |
Serhiy Storchaka | 009b811 | 2015-03-18 21:53:15 +0200 | [diff] [blame] | 908 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 909 | As usual, if buffertype=PyBUF_WRITE, the exporter's buffer must be writable, |
| 910 | otherwise it may be writable or read-only. |
| 911 | |
| 912 | If the exporter is already contiguous with the desired target order, |
| 913 | the memoryview will be directly based on the exporter. |
| 914 | |
| 915 | Otherwise, if the buffertype is PyBUF_READ, the memoryview will be |
| 916 | based on a new bytes object. If order={'C', 'A'ny}, use 'C' order, |
| 917 | 'F'ortran order otherwise. |
| 918 | */ |
| 919 | PyObject * |
| 920 | PyMemoryView_GetContiguous(PyObject *obj, int buffertype, char order) |
| 921 | { |
| 922 | PyMemoryViewObject *mv; |
| 923 | PyObject *ret; |
| 924 | Py_buffer *view; |
| 925 | |
| 926 | assert(buffertype == PyBUF_READ || buffertype == PyBUF_WRITE); |
| 927 | assert(order == 'C' || order == 'F' || order == 'A'); |
| 928 | |
| 929 | mv = (PyMemoryViewObject *)PyMemoryView_FromObject(obj); |
| 930 | if (mv == NULL) |
| 931 | return NULL; |
| 932 | |
| 933 | view = &mv->view; |
| 934 | if (buffertype == PyBUF_WRITE && view->readonly) { |
| 935 | PyErr_SetString(PyExc_BufferError, |
| 936 | "underlying buffer is not writable"); |
| 937 | Py_DECREF(mv); |
| 938 | return NULL; |
| 939 | } |
| 940 | |
| 941 | if (PyBuffer_IsContiguous(view, order)) |
| 942 | return (PyObject *)mv; |
| 943 | |
| 944 | if (buffertype == PyBUF_WRITE) { |
| 945 | PyErr_SetString(PyExc_BufferError, |
| 946 | "writable contiguous buffer requested " |
| 947 | "for a non-contiguous object."); |
| 948 | Py_DECREF(mv); |
| 949 | return NULL; |
| 950 | } |
| 951 | |
| 952 | ret = memory_from_contiguous_copy(view, order); |
| 953 | Py_DECREF(mv); |
| 954 | return ret; |
| 955 | } |
| 956 | |
| 957 | |
Serhiy Storchaka | 80a5036 | 2020-07-18 11:12:05 +0300 | [diff] [blame] | 958 | /*[clinic input] |
| 959 | @classmethod |
| 960 | memoryview.__new__ |
| 961 | |
| 962 | object: object |
| 963 | |
| 964 | Create a new memoryview object which references the given object. |
| 965 | [clinic start generated code]*/ |
| 966 | |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 967 | static PyObject * |
Serhiy Storchaka | 80a5036 | 2020-07-18 11:12:05 +0300 | [diff] [blame] | 968 | memoryview_impl(PyTypeObject *type, PyObject *object) |
| 969 | /*[clinic end generated code: output=7de78e184ed66db8 input=f04429eb0bdf8c6e]*/ |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 970 | { |
Serhiy Storchaka | 80a5036 | 2020-07-18 11:12:05 +0300 | [diff] [blame] | 971 | return PyMemoryView_FromObject(object); |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 972 | } |
| 973 | |
| 974 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 975 | /****************************************************************************/ |
Stefan Krah | 7d12d9d | 2012-07-28 12:25:55 +0200 | [diff] [blame] | 976 | /* Previously in abstract.c */ |
| 977 | /****************************************************************************/ |
| 978 | |
| 979 | typedef struct { |
| 980 | Py_buffer view; |
| 981 | Py_ssize_t array[1]; |
| 982 | } Py_buffer_full; |
| 983 | |
| 984 | int |
| 985 | PyBuffer_ToContiguous(void *buf, Py_buffer *src, Py_ssize_t len, char order) |
| 986 | { |
| 987 | Py_buffer_full *fb = NULL; |
| 988 | int ret; |
| 989 | |
| 990 | assert(order == 'C' || order == 'F' || order == 'A'); |
| 991 | |
| 992 | if (len != src->len) { |
| 993 | PyErr_SetString(PyExc_ValueError, |
| 994 | "PyBuffer_ToContiguous: len != view->len"); |
| 995 | return -1; |
| 996 | } |
| 997 | |
| 998 | if (PyBuffer_IsContiguous(src, order)) { |
| 999 | memcpy((char *)buf, src->buf, len); |
| 1000 | return 0; |
| 1001 | } |
| 1002 | |
| 1003 | /* buffer_to_contiguous() assumes PyBUF_FULL */ |
| 1004 | fb = PyMem_Malloc(sizeof *fb + 3 * src->ndim * (sizeof *fb->array)); |
| 1005 | if (fb == NULL) { |
| 1006 | PyErr_NoMemory(); |
| 1007 | return -1; |
| 1008 | } |
| 1009 | fb->view.ndim = src->ndim; |
| 1010 | fb->view.shape = fb->array; |
| 1011 | fb->view.strides = fb->array + src->ndim; |
| 1012 | fb->view.suboffsets = fb->array + 2 * src->ndim; |
| 1013 | |
| 1014 | init_shared_values(&fb->view, src); |
| 1015 | init_shape_strides(&fb->view, src); |
| 1016 | init_suboffsets(&fb->view, src); |
| 1017 | |
| 1018 | src = &fb->view; |
| 1019 | |
| 1020 | ret = buffer_to_contiguous(buf, src, order); |
| 1021 | PyMem_Free(fb); |
| 1022 | return ret; |
| 1023 | } |
| 1024 | |
| 1025 | |
| 1026 | /****************************************************************************/ |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1027 | /* Release/GC management */ |
| 1028 | /****************************************************************************/ |
| 1029 | |
| 1030 | /* Inform the managed buffer that this particular memoryview will not access |
| 1031 | the underlying buffer again. If no other memoryviews are registered with |
| 1032 | the managed buffer, the underlying buffer is released instantly and |
| 1033 | marked as inaccessible for both the memoryview and the managed buffer. |
| 1034 | |
| 1035 | This function fails if the memoryview itself has exported buffers. */ |
| 1036 | static int |
| 1037 | _memory_release(PyMemoryViewObject *self) |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 1038 | { |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1039 | if (self->flags & _Py_MEMORYVIEW_RELEASED) |
| 1040 | return 0; |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 1041 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1042 | if (self->exports == 0) { |
| 1043 | self->flags |= _Py_MEMORYVIEW_RELEASED; |
| 1044 | assert(self->mbuf->exports > 0); |
| 1045 | if (--self->mbuf->exports == 0) |
| 1046 | mbuf_release(self->mbuf); |
| 1047 | return 0; |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 1048 | } |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1049 | if (self->exports > 0) { |
| 1050 | PyErr_Format(PyExc_BufferError, |
| 1051 | "memoryview has %zd exported buffer%s", self->exports, |
| 1052 | self->exports==1 ? "" : "s"); |
| 1053 | return -1; |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 1054 | } |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 1055 | |
Victor Stinner | 47ee8a6 | 2020-01-27 22:37:44 +0100 | [diff] [blame] | 1056 | PyErr_SetString(PyExc_SystemError, |
| 1057 | "_memory_release(): negative export count"); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1058 | return -1; |
| 1059 | } |
| 1060 | |
Serhiy Storchaka | 80a5036 | 2020-07-18 11:12:05 +0300 | [diff] [blame] | 1061 | /*[clinic input] |
| 1062 | memoryview.release |
| 1063 | |
| 1064 | Release the underlying buffer exposed by the memoryview object. |
| 1065 | [clinic start generated code]*/ |
| 1066 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1067 | static PyObject * |
Serhiy Storchaka | 80a5036 | 2020-07-18 11:12:05 +0300 | [diff] [blame] | 1068 | memoryview_release_impl(PyMemoryViewObject *self) |
| 1069 | /*[clinic end generated code: output=d0b7e3ba95b7fcb9 input=bc71d1d51f4a52f0]*/ |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1070 | { |
| 1071 | if (_memory_release(self) < 0) |
| 1072 | return NULL; |
| 1073 | Py_RETURN_NONE; |
| 1074 | } |
| 1075 | |
| 1076 | static void |
| 1077 | memory_dealloc(PyMemoryViewObject *self) |
| 1078 | { |
| 1079 | assert(self->exports == 0); |
| 1080 | _PyObject_GC_UNTRACK(self); |
| 1081 | (void)_memory_release(self); |
| 1082 | Py_CLEAR(self->mbuf); |
Richard Oudkerk | 3e0a1eb | 2012-05-28 21:35:09 +0100 | [diff] [blame] | 1083 | if (self->weakreflist != NULL) |
| 1084 | PyObject_ClearWeakRefs((PyObject *) self); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1085 | PyObject_GC_Del(self); |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 1086 | } |
| 1087 | |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 1088 | static int |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1089 | memory_traverse(PyMemoryViewObject *self, visitproc visit, void *arg) |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 1090 | { |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1091 | Py_VISIT(self->mbuf); |
| 1092 | return 0; |
| 1093 | } |
Guido van Rossum | 5dde61d | 2007-09-25 22:10:05 +0000 | [diff] [blame] | 1094 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1095 | static int |
| 1096 | memory_clear(PyMemoryViewObject *self) |
| 1097 | { |
| 1098 | (void)_memory_release(self); |
| 1099 | Py_CLEAR(self->mbuf); |
| 1100 | return 0; |
| 1101 | } |
| 1102 | |
| 1103 | static PyObject * |
| 1104 | memory_enter(PyObject *self, PyObject *args) |
| 1105 | { |
| 1106 | CHECK_RELEASED(self); |
| 1107 | Py_INCREF(self); |
| 1108 | return self; |
| 1109 | } |
| 1110 | |
| 1111 | static PyObject * |
| 1112 | memory_exit(PyObject *self, PyObject *args) |
| 1113 | { |
Serhiy Storchaka | 80a5036 | 2020-07-18 11:12:05 +0300 | [diff] [blame] | 1114 | return memoryview_release_impl((PyMemoryViewObject *)self); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1115 | } |
| 1116 | |
| 1117 | |
| 1118 | /****************************************************************************/ |
| 1119 | /* Casting format and shape */ |
| 1120 | /****************************************************************************/ |
| 1121 | |
| 1122 | #define IS_BYTE_FORMAT(f) (f == 'b' || f == 'B' || f == 'c') |
| 1123 | |
Benjamin Peterson | 82cce4c | 2016-09-08 11:56:06 -0700 | [diff] [blame] | 1124 | static inline Py_ssize_t |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1125 | get_native_fmtchar(char *result, const char *fmt) |
| 1126 | { |
| 1127 | Py_ssize_t size = -1; |
| 1128 | |
| 1129 | if (fmt[0] == '@') fmt++; |
| 1130 | |
| 1131 | switch (fmt[0]) { |
| 1132 | case 'c': case 'b': case 'B': size = sizeof(char); break; |
| 1133 | case 'h': case 'H': size = sizeof(short); break; |
| 1134 | case 'i': case 'I': size = sizeof(int); break; |
| 1135 | case 'l': case 'L': size = sizeof(long); break; |
Benjamin Peterson | af580df | 2016-09-06 10:46:49 -0700 | [diff] [blame] | 1136 | case 'q': case 'Q': size = sizeof(long long); break; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1137 | case 'n': case 'N': size = sizeof(Py_ssize_t); break; |
| 1138 | case 'f': size = sizeof(float); break; |
| 1139 | case 'd': size = sizeof(double); break; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1140 | case '?': size = sizeof(_Bool); break; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1141 | case 'P': size = sizeof(void *); break; |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 1142 | } |
Guido van Rossum | 5dde61d | 2007-09-25 22:10:05 +0000 | [diff] [blame] | 1143 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1144 | if (size > 0 && fmt[1] == '\0') { |
| 1145 | *result = fmt[0]; |
| 1146 | return size; |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 1147 | } |
Guido van Rossum | 5dde61d | 2007-09-25 22:10:05 +0000 | [diff] [blame] | 1148 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1149 | return -1; |
| 1150 | } |
| 1151 | |
Benjamin Peterson | 82cce4c | 2016-09-08 11:56:06 -0700 | [diff] [blame] | 1152 | static inline const char * |
Stefan Krah | fa5d6a5 | 2015-01-29 14:27:23 +0100 | [diff] [blame] | 1153 | get_native_fmtstr(const char *fmt) |
| 1154 | { |
| 1155 | int at = 0; |
| 1156 | |
| 1157 | if (fmt[0] == '@') { |
| 1158 | at = 1; |
| 1159 | fmt++; |
| 1160 | } |
| 1161 | if (fmt[0] == '\0' || fmt[1] != '\0') { |
| 1162 | return NULL; |
| 1163 | } |
| 1164 | |
| 1165 | #define RETURN(s) do { return at ? "@" s : s; } while (0) |
| 1166 | |
| 1167 | switch (fmt[0]) { |
| 1168 | case 'c': RETURN("c"); |
| 1169 | case 'b': RETURN("b"); |
| 1170 | case 'B': RETURN("B"); |
| 1171 | case 'h': RETURN("h"); |
| 1172 | case 'H': RETURN("H"); |
| 1173 | case 'i': RETURN("i"); |
| 1174 | case 'I': RETURN("I"); |
| 1175 | case 'l': RETURN("l"); |
| 1176 | case 'L': RETURN("L"); |
Stefan Krah | fa5d6a5 | 2015-01-29 14:27:23 +0100 | [diff] [blame] | 1177 | case 'q': RETURN("q"); |
| 1178 | case 'Q': RETURN("Q"); |
Stefan Krah | fa5d6a5 | 2015-01-29 14:27:23 +0100 | [diff] [blame] | 1179 | case 'n': RETURN("n"); |
| 1180 | case 'N': RETURN("N"); |
| 1181 | case 'f': RETURN("f"); |
| 1182 | case 'd': RETURN("d"); |
Stefan Krah | fa5d6a5 | 2015-01-29 14:27:23 +0100 | [diff] [blame] | 1183 | case '?': RETURN("?"); |
Stefan Krah | fa5d6a5 | 2015-01-29 14:27:23 +0100 | [diff] [blame] | 1184 | case 'P': RETURN("P"); |
| 1185 | } |
| 1186 | |
| 1187 | return NULL; |
| 1188 | } |
| 1189 | |
| 1190 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1191 | /* Cast a memoryview's data type to 'format'. The input array must be |
| 1192 | C-contiguous. At least one of input-format, output-format must have |
| 1193 | byte size. The output array is 1-D, with the same byte length as the |
| 1194 | input array. Thus, view->len must be a multiple of the new itemsize. */ |
| 1195 | static int |
| 1196 | cast_to_1D(PyMemoryViewObject *mv, PyObject *format) |
| 1197 | { |
| 1198 | Py_buffer *view = &mv->view; |
| 1199 | PyObject *asciifmt; |
| 1200 | char srcchar, destchar; |
| 1201 | Py_ssize_t itemsize; |
| 1202 | int ret = -1; |
| 1203 | |
| 1204 | assert(view->ndim >= 1); |
| 1205 | assert(Py_SIZE(mv) == 3*view->ndim); |
| 1206 | assert(view->shape == mv->ob_array); |
| 1207 | assert(view->strides == mv->ob_array + view->ndim); |
| 1208 | assert(view->suboffsets == mv->ob_array + 2*view->ndim); |
| 1209 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1210 | asciifmt = PyUnicode_AsASCIIString(format); |
| 1211 | if (asciifmt == NULL) |
| 1212 | return ret; |
| 1213 | |
| 1214 | itemsize = get_native_fmtchar(&destchar, PyBytes_AS_STRING(asciifmt)); |
| 1215 | if (itemsize < 0) { |
| 1216 | PyErr_SetString(PyExc_ValueError, |
| 1217 | "memoryview: destination format must be a native single " |
| 1218 | "character format prefixed with an optional '@'"); |
| 1219 | goto out; |
| 1220 | } |
| 1221 | |
Stefan Krah | 0c51595 | 2015-08-08 13:38:10 +0200 | [diff] [blame] | 1222 | if ((get_native_fmtchar(&srcchar, view->format) < 0 || |
| 1223 | !IS_BYTE_FORMAT(srcchar)) && !IS_BYTE_FORMAT(destchar)) { |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1224 | PyErr_SetString(PyExc_TypeError, |
| 1225 | "memoryview: cannot cast between two non-byte formats"); |
| 1226 | goto out; |
| 1227 | } |
| 1228 | if (view->len % itemsize) { |
| 1229 | PyErr_SetString(PyExc_TypeError, |
| 1230 | "memoryview: length is not a multiple of itemsize"); |
| 1231 | goto out; |
| 1232 | } |
| 1233 | |
Serhiy Storchaka | ef1585e | 2015-12-25 20:01:53 +0200 | [diff] [blame] | 1234 | view->format = (char *)get_native_fmtstr(PyBytes_AS_STRING(asciifmt)); |
Stefan Krah | fa5d6a5 | 2015-01-29 14:27:23 +0100 | [diff] [blame] | 1235 | if (view->format == NULL) { |
| 1236 | /* NOT_REACHED: get_native_fmtchar() already validates the format. */ |
| 1237 | PyErr_SetString(PyExc_RuntimeError, |
| 1238 | "memoryview: internal error"); |
| 1239 | goto out; |
| 1240 | } |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1241 | view->itemsize = itemsize; |
| 1242 | |
| 1243 | view->ndim = 1; |
| 1244 | view->shape[0] = view->len / view->itemsize; |
| 1245 | view->strides[0] = view->itemsize; |
| 1246 | view->suboffsets = NULL; |
| 1247 | |
| 1248 | init_flags(mv); |
Serhiy Storchaka | 009b811 | 2015-03-18 21:53:15 +0200 | [diff] [blame] | 1249 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1250 | ret = 0; |
| 1251 | |
| 1252 | out: |
| 1253 | Py_DECREF(asciifmt); |
| 1254 | return ret; |
| 1255 | } |
| 1256 | |
| 1257 | /* The memoryview must have space for 3*len(seq) elements. */ |
| 1258 | static Py_ssize_t |
| 1259 | copy_shape(Py_ssize_t *shape, const PyObject *seq, Py_ssize_t ndim, |
| 1260 | Py_ssize_t itemsize) |
| 1261 | { |
| 1262 | Py_ssize_t x, i; |
| 1263 | Py_ssize_t len = itemsize; |
| 1264 | |
| 1265 | for (i = 0; i < ndim; i++) { |
| 1266 | PyObject *tmp = PySequence_Fast_GET_ITEM(seq, i); |
| 1267 | if (!PyLong_Check(tmp)) { |
| 1268 | PyErr_SetString(PyExc_TypeError, |
| 1269 | "memoryview.cast(): elements of shape must be integers"); |
| 1270 | return -1; |
| 1271 | } |
| 1272 | x = PyLong_AsSsize_t(tmp); |
| 1273 | if (x == -1 && PyErr_Occurred()) { |
| 1274 | return -1; |
| 1275 | } |
| 1276 | if (x <= 0) { |
| 1277 | /* In general elements of shape may be 0, but not for casting. */ |
| 1278 | PyErr_Format(PyExc_ValueError, |
| 1279 | "memoryview.cast(): elements of shape must be integers > 0"); |
| 1280 | return -1; |
| 1281 | } |
| 1282 | if (x > PY_SSIZE_T_MAX / len) { |
| 1283 | PyErr_Format(PyExc_ValueError, |
| 1284 | "memoryview.cast(): product(shape) > SSIZE_MAX"); |
| 1285 | return -1; |
| 1286 | } |
| 1287 | len *= x; |
| 1288 | shape[i] = x; |
| 1289 | } |
| 1290 | |
| 1291 | return len; |
| 1292 | } |
| 1293 | |
| 1294 | /* Cast a 1-D array to a new shape. The result array will be C-contiguous. |
| 1295 | If the result array does not have exactly the same byte length as the |
| 1296 | input array, raise ValueError. */ |
| 1297 | static int |
| 1298 | cast_to_ND(PyMemoryViewObject *mv, const PyObject *shape, int ndim) |
| 1299 | { |
| 1300 | Py_buffer *view = &mv->view; |
| 1301 | Py_ssize_t len; |
| 1302 | |
| 1303 | assert(view->ndim == 1); /* ndim from cast_to_1D() */ |
| 1304 | assert(Py_SIZE(mv) == 3*(ndim==0?1:ndim)); /* ndim of result array */ |
| 1305 | assert(view->shape == mv->ob_array); |
| 1306 | assert(view->strides == mv->ob_array + (ndim==0?1:ndim)); |
| 1307 | assert(view->suboffsets == NULL); |
| 1308 | |
| 1309 | view->ndim = ndim; |
| 1310 | if (view->ndim == 0) { |
| 1311 | view->shape = NULL; |
| 1312 | view->strides = NULL; |
| 1313 | len = view->itemsize; |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 1314 | } |
| 1315 | else { |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1316 | len = copy_shape(view->shape, shape, ndim, view->itemsize); |
| 1317 | if (len < 0) |
| 1318 | return -1; |
| 1319 | init_strides_from_shape(view); |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 1320 | } |
Guido van Rossum | 5dde61d | 2007-09-25 22:10:05 +0000 | [diff] [blame] | 1321 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1322 | if (view->len != len) { |
| 1323 | PyErr_SetString(PyExc_TypeError, |
| 1324 | "memoryview: product(shape) * itemsize != buffer size"); |
| 1325 | return -1; |
| 1326 | } |
| 1327 | |
| 1328 | init_flags(mv); |
| 1329 | |
| 1330 | return 0; |
| 1331 | } |
| 1332 | |
| 1333 | static int |
| 1334 | zero_in_shape(PyMemoryViewObject *mv) |
| 1335 | { |
| 1336 | Py_buffer *view = &mv->view; |
| 1337 | Py_ssize_t i; |
| 1338 | |
| 1339 | for (i = 0; i < view->ndim; i++) |
| 1340 | if (view->shape[i] == 0) |
| 1341 | return 1; |
| 1342 | |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 1343 | return 0; |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 1344 | } |
| 1345 | |
Guido van Rossum | 5dde61d | 2007-09-25 22:10:05 +0000 | [diff] [blame] | 1346 | /* |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1347 | Cast a copy of 'self' to a different view. The input view must |
| 1348 | be C-contiguous. The function always casts the input view to a |
| 1349 | 1-D output according to 'format'. At least one of input-format, |
| 1350 | output-format must have byte size. |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 1351 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1352 | If 'shape' is given, the 1-D view from the previous step will |
| 1353 | be cast to a C-contiguous view with new shape and strides. |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 1354 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1355 | All casts must result in views that will have the exact byte |
| 1356 | size of the original input. Otherwise, an error is raised. |
| 1357 | */ |
Serhiy Storchaka | 80a5036 | 2020-07-18 11:12:05 +0300 | [diff] [blame] | 1358 | /*[clinic input] |
| 1359 | memoryview.cast |
| 1360 | |
| 1361 | format: unicode |
| 1362 | shape: object = NULL |
| 1363 | |
| 1364 | Cast a memoryview to a new format or shape. |
| 1365 | [clinic start generated code]*/ |
| 1366 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1367 | static PyObject * |
Serhiy Storchaka | 80a5036 | 2020-07-18 11:12:05 +0300 | [diff] [blame] | 1368 | memoryview_cast_impl(PyMemoryViewObject *self, PyObject *format, |
| 1369 | PyObject *shape) |
| 1370 | /*[clinic end generated code: output=bae520b3a389cbab input=138936cc9041b1a3]*/ |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 1371 | { |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1372 | PyMemoryViewObject *mv = NULL; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1373 | Py_ssize_t ndim = 1; |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 1374 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1375 | CHECK_RELEASED(self); |
| 1376 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1377 | if (!MV_C_CONTIGUOUS(self->flags)) { |
| 1378 | PyErr_SetString(PyExc_TypeError, |
| 1379 | "memoryview: casts are restricted to C-contiguous views"); |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 1380 | return NULL; |
| 1381 | } |
Antoine Pitrou | 60b1834 | 2013-10-03 19:55:41 +0200 | [diff] [blame] | 1382 | if ((shape || self->view.ndim != 1) && zero_in_shape(self)) { |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1383 | PyErr_SetString(PyExc_TypeError, |
| 1384 | "memoryview: cannot cast view with zeros in shape or strides"); |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 1385 | return NULL; |
| 1386 | } |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1387 | if (shape) { |
| 1388 | CHECK_LIST_OR_TUPLE(shape) |
| 1389 | ndim = PySequence_Fast_GET_SIZE(shape); |
| 1390 | if (ndim > PyBUF_MAX_NDIM) { |
| 1391 | PyErr_SetString(PyExc_ValueError, |
| 1392 | "memoryview: number of dimensions must not exceed " |
Victor Stinner | 45e8e2f | 2014-05-14 17:24:35 +0200 | [diff] [blame] | 1393 | Py_STRINGIFY(PyBUF_MAX_NDIM)); |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 1394 | return NULL; |
| 1395 | } |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1396 | if (self->view.ndim != 1 && ndim != 1) { |
| 1397 | PyErr_SetString(PyExc_TypeError, |
| 1398 | "memoryview: cast must be 1D -> ND or ND -> 1D"); |
| 1399 | return NULL; |
| 1400 | } |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 1401 | } |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1402 | |
| 1403 | mv = (PyMemoryViewObject *) |
| 1404 | mbuf_add_incomplete_view(self->mbuf, &self->view, ndim==0 ? 1 : (int)ndim); |
| 1405 | if (mv == NULL) |
| 1406 | return NULL; |
| 1407 | |
| 1408 | if (cast_to_1D(mv, format) < 0) |
| 1409 | goto error; |
| 1410 | if (shape && cast_to_ND(mv, shape, (int)ndim) < 0) |
| 1411 | goto error; |
| 1412 | |
| 1413 | return (PyObject *)mv; |
| 1414 | |
| 1415 | error: |
| 1416 | Py_DECREF(mv); |
| 1417 | return NULL; |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 1418 | } |
| 1419 | |
Serhiy Storchaka | 80a5036 | 2020-07-18 11:12:05 +0300 | [diff] [blame] | 1420 | /*[clinic input] |
| 1421 | memoryview.toreadonly |
| 1422 | |
| 1423 | Return a readonly version of the memoryview. |
| 1424 | [clinic start generated code]*/ |
| 1425 | |
Antoine Pitrou | 480ab05 | 2018-04-14 19:49:21 +0200 | [diff] [blame] | 1426 | static PyObject * |
Serhiy Storchaka | 80a5036 | 2020-07-18 11:12:05 +0300 | [diff] [blame] | 1427 | memoryview_toreadonly_impl(PyMemoryViewObject *self) |
| 1428 | /*[clinic end generated code: output=2c7e056f04c99e62 input=dc06d20f19ba236f]*/ |
Antoine Pitrou | 480ab05 | 2018-04-14 19:49:21 +0200 | [diff] [blame] | 1429 | { |
| 1430 | CHECK_RELEASED(self); |
| 1431 | /* Even if self is already readonly, we still need to create a new |
| 1432 | * object for .release() to work correctly. |
| 1433 | */ |
| 1434 | self = (PyMemoryViewObject *) mbuf_add_view(self->mbuf, &self->view); |
| 1435 | if (self != NULL) { |
| 1436 | self->view.readonly = 1; |
| 1437 | }; |
| 1438 | return (PyObject *) self; |
| 1439 | } |
| 1440 | |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 1441 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1442 | /**************************************************************************/ |
| 1443 | /* getbuffer */ |
| 1444 | /**************************************************************************/ |
| 1445 | |
| 1446 | static int |
| 1447 | memory_getbuf(PyMemoryViewObject *self, Py_buffer *view, int flags) |
| 1448 | { |
| 1449 | Py_buffer *base = &self->view; |
| 1450 | int baseflags = self->flags; |
| 1451 | |
| 1452 | CHECK_RELEASED_INT(self); |
| 1453 | |
| 1454 | /* start with complete information */ |
| 1455 | *view = *base; |
| 1456 | view->obj = NULL; |
| 1457 | |
| 1458 | if (REQ_WRITABLE(flags) && base->readonly) { |
| 1459 | PyErr_SetString(PyExc_BufferError, |
| 1460 | "memoryview: underlying buffer is not writable"); |
| 1461 | return -1; |
| 1462 | } |
| 1463 | if (!REQ_FORMAT(flags)) { |
| 1464 | /* NULL indicates that the buffer's data type has been cast to 'B'. |
| 1465 | view->itemsize is the _previous_ itemsize. If shape is present, |
| 1466 | the equality product(shape) * itemsize = len still holds at this |
| 1467 | point. The equality calcsize(format) = itemsize does _not_ hold |
| 1468 | from here on! */ |
| 1469 | view->format = NULL; |
| 1470 | } |
| 1471 | |
| 1472 | if (REQ_C_CONTIGUOUS(flags) && !MV_C_CONTIGUOUS(baseflags)) { |
| 1473 | PyErr_SetString(PyExc_BufferError, |
| 1474 | "memoryview: underlying buffer is not C-contiguous"); |
| 1475 | return -1; |
| 1476 | } |
| 1477 | if (REQ_F_CONTIGUOUS(flags) && !MV_F_CONTIGUOUS(baseflags)) { |
| 1478 | PyErr_SetString(PyExc_BufferError, |
| 1479 | "memoryview: underlying buffer is not Fortran contiguous"); |
| 1480 | return -1; |
| 1481 | } |
| 1482 | if (REQ_ANY_CONTIGUOUS(flags) && !MV_ANY_CONTIGUOUS(baseflags)) { |
| 1483 | PyErr_SetString(PyExc_BufferError, |
| 1484 | "memoryview: underlying buffer is not contiguous"); |
| 1485 | return -1; |
| 1486 | } |
| 1487 | if (!REQ_INDIRECT(flags) && (baseflags & _Py_MEMORYVIEW_PIL)) { |
| 1488 | PyErr_SetString(PyExc_BufferError, |
| 1489 | "memoryview: underlying buffer requires suboffsets"); |
| 1490 | return -1; |
| 1491 | } |
| 1492 | if (!REQ_STRIDES(flags)) { |
| 1493 | if (!MV_C_CONTIGUOUS(baseflags)) { |
| 1494 | PyErr_SetString(PyExc_BufferError, |
| 1495 | "memoryview: underlying buffer is not C-contiguous"); |
| 1496 | return -1; |
| 1497 | } |
| 1498 | view->strides = NULL; |
| 1499 | } |
| 1500 | if (!REQ_SHAPE(flags)) { |
| 1501 | /* PyBUF_SIMPLE or PyBUF_WRITABLE: at this point buf is C-contiguous, |
| 1502 | so base->buf = ndbuf->data. */ |
| 1503 | if (view->format != NULL) { |
| 1504 | /* PyBUF_SIMPLE|PyBUF_FORMAT and PyBUF_WRITABLE|PyBUF_FORMAT do |
| 1505 | not make sense. */ |
| 1506 | PyErr_Format(PyExc_BufferError, |
Stefan Krah | 674a42b | 2013-02-19 13:44:49 +0100 | [diff] [blame] | 1507 | "memoryview: cannot cast to unsigned bytes if the format flag " |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1508 | "is present"); |
| 1509 | return -1; |
| 1510 | } |
| 1511 | /* product(shape) * itemsize = len and calcsize(format) = itemsize |
| 1512 | do _not_ hold from here on! */ |
| 1513 | view->ndim = 1; |
| 1514 | view->shape = NULL; |
| 1515 | } |
| 1516 | |
| 1517 | |
| 1518 | view->obj = (PyObject *)self; |
| 1519 | Py_INCREF(view->obj); |
| 1520 | self->exports++; |
| 1521 | |
| 1522 | return 0; |
| 1523 | } |
| 1524 | |
| 1525 | static void |
| 1526 | memory_releasebuf(PyMemoryViewObject *self, Py_buffer *view) |
| 1527 | { |
| 1528 | self->exports--; |
| 1529 | return; |
| 1530 | /* PyBuffer_Release() decrements view->obj after this function returns. */ |
| 1531 | } |
| 1532 | |
| 1533 | /* Buffer methods */ |
| 1534 | static PyBufferProcs memory_as_buffer = { |
| 1535 | (getbufferproc)memory_getbuf, /* bf_getbuffer */ |
| 1536 | (releasebufferproc)memory_releasebuf, /* bf_releasebuffer */ |
| 1537 | }; |
| 1538 | |
| 1539 | |
| 1540 | /****************************************************************************/ |
| 1541 | /* Optimized pack/unpack for all native format specifiers */ |
| 1542 | /****************************************************************************/ |
| 1543 | |
| 1544 | /* |
| 1545 | Fix exceptions: |
| 1546 | 1) Include format string in the error message. |
| 1547 | 2) OverflowError -> ValueError. |
| 1548 | 3) The error message from PyNumber_Index() is not ideal. |
| 1549 | */ |
| 1550 | static int |
| 1551 | type_error_int(const char *fmt) |
| 1552 | { |
| 1553 | PyErr_Format(PyExc_TypeError, |
| 1554 | "memoryview: invalid type for format '%s'", fmt); |
| 1555 | return -1; |
| 1556 | } |
| 1557 | |
| 1558 | static int |
| 1559 | value_error_int(const char *fmt) |
| 1560 | { |
| 1561 | PyErr_Format(PyExc_ValueError, |
| 1562 | "memoryview: invalid value for format '%s'", fmt); |
| 1563 | return -1; |
| 1564 | } |
| 1565 | |
| 1566 | static int |
| 1567 | fix_error_int(const char *fmt) |
| 1568 | { |
| 1569 | assert(PyErr_Occurred()); |
| 1570 | if (PyErr_ExceptionMatches(PyExc_TypeError)) { |
| 1571 | PyErr_Clear(); |
| 1572 | return type_error_int(fmt); |
| 1573 | } |
| 1574 | else if (PyErr_ExceptionMatches(PyExc_OverflowError) || |
| 1575 | PyErr_ExceptionMatches(PyExc_ValueError)) { |
| 1576 | PyErr_Clear(); |
| 1577 | return value_error_int(fmt); |
| 1578 | } |
| 1579 | |
| 1580 | return -1; |
| 1581 | } |
| 1582 | |
| 1583 | /* Accept integer objects or objects with an __index__() method. */ |
| 1584 | static long |
| 1585 | pylong_as_ld(PyObject *item) |
| 1586 | { |
| 1587 | PyObject *tmp; |
| 1588 | long ld; |
| 1589 | |
Serhiy Storchaka | 5f4b229d | 2020-05-28 10:33:45 +0300 | [diff] [blame] | 1590 | tmp = _PyNumber_Index(item); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1591 | if (tmp == NULL) |
| 1592 | return -1; |
| 1593 | |
| 1594 | ld = PyLong_AsLong(tmp); |
| 1595 | Py_DECREF(tmp); |
| 1596 | return ld; |
| 1597 | } |
| 1598 | |
| 1599 | static unsigned long |
| 1600 | pylong_as_lu(PyObject *item) |
| 1601 | { |
| 1602 | PyObject *tmp; |
| 1603 | unsigned long lu; |
| 1604 | |
Serhiy Storchaka | 5f4b229d | 2020-05-28 10:33:45 +0300 | [diff] [blame] | 1605 | tmp = _PyNumber_Index(item); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1606 | if (tmp == NULL) |
| 1607 | return (unsigned long)-1; |
| 1608 | |
| 1609 | lu = PyLong_AsUnsignedLong(tmp); |
| 1610 | Py_DECREF(tmp); |
| 1611 | return lu; |
| 1612 | } |
| 1613 | |
Benjamin Peterson | af580df | 2016-09-06 10:46:49 -0700 | [diff] [blame] | 1614 | static long long |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1615 | pylong_as_lld(PyObject *item) |
| 1616 | { |
| 1617 | PyObject *tmp; |
Benjamin Peterson | af580df | 2016-09-06 10:46:49 -0700 | [diff] [blame] | 1618 | long long lld; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1619 | |
Serhiy Storchaka | 5f4b229d | 2020-05-28 10:33:45 +0300 | [diff] [blame] | 1620 | tmp = _PyNumber_Index(item); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1621 | if (tmp == NULL) |
| 1622 | return -1; |
| 1623 | |
| 1624 | lld = PyLong_AsLongLong(tmp); |
| 1625 | Py_DECREF(tmp); |
| 1626 | return lld; |
| 1627 | } |
| 1628 | |
Benjamin Peterson | af580df | 2016-09-06 10:46:49 -0700 | [diff] [blame] | 1629 | static unsigned long long |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1630 | pylong_as_llu(PyObject *item) |
| 1631 | { |
| 1632 | PyObject *tmp; |
Benjamin Peterson | af580df | 2016-09-06 10:46:49 -0700 | [diff] [blame] | 1633 | unsigned long long llu; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1634 | |
Serhiy Storchaka | 5f4b229d | 2020-05-28 10:33:45 +0300 | [diff] [blame] | 1635 | tmp = _PyNumber_Index(item); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1636 | if (tmp == NULL) |
Benjamin Peterson | af580df | 2016-09-06 10:46:49 -0700 | [diff] [blame] | 1637 | return (unsigned long long)-1; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1638 | |
| 1639 | llu = PyLong_AsUnsignedLongLong(tmp); |
| 1640 | Py_DECREF(tmp); |
| 1641 | return llu; |
| 1642 | } |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1643 | |
| 1644 | static Py_ssize_t |
| 1645 | pylong_as_zd(PyObject *item) |
| 1646 | { |
| 1647 | PyObject *tmp; |
| 1648 | Py_ssize_t zd; |
| 1649 | |
Serhiy Storchaka | 5f4b229d | 2020-05-28 10:33:45 +0300 | [diff] [blame] | 1650 | tmp = _PyNumber_Index(item); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1651 | if (tmp == NULL) |
| 1652 | return -1; |
| 1653 | |
| 1654 | zd = PyLong_AsSsize_t(tmp); |
| 1655 | Py_DECREF(tmp); |
| 1656 | return zd; |
| 1657 | } |
| 1658 | |
| 1659 | static size_t |
| 1660 | pylong_as_zu(PyObject *item) |
| 1661 | { |
| 1662 | PyObject *tmp; |
| 1663 | size_t zu; |
| 1664 | |
Serhiy Storchaka | 5f4b229d | 2020-05-28 10:33:45 +0300 | [diff] [blame] | 1665 | tmp = _PyNumber_Index(item); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1666 | if (tmp == NULL) |
| 1667 | return (size_t)-1; |
| 1668 | |
| 1669 | zu = PyLong_AsSize_t(tmp); |
| 1670 | Py_DECREF(tmp); |
| 1671 | return zu; |
| 1672 | } |
| 1673 | |
| 1674 | /* Timings with the ndarray from _testbuffer.c indicate that using the |
| 1675 | struct module is around 15x slower than the two functions below. */ |
| 1676 | |
| 1677 | #define UNPACK_SINGLE(dest, ptr, type) \ |
| 1678 | do { \ |
| 1679 | type x; \ |
| 1680 | memcpy((char *)&x, ptr, sizeof x); \ |
| 1681 | dest = x; \ |
| 1682 | } while (0) |
| 1683 | |
| 1684 | /* Unpack a single item. 'fmt' can be any native format character in struct |
| 1685 | module syntax. This function is very sensitive to small changes. With this |
| 1686 | layout gcc automatically generates a fast jump table. */ |
Benjamin Peterson | 82cce4c | 2016-09-08 11:56:06 -0700 | [diff] [blame] | 1687 | static inline PyObject * |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1688 | unpack_single(const char *ptr, const char *fmt) |
| 1689 | { |
Benjamin Peterson | af580df | 2016-09-06 10:46:49 -0700 | [diff] [blame] | 1690 | unsigned long long llu; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1691 | unsigned long lu; |
| 1692 | size_t zu; |
Benjamin Peterson | af580df | 2016-09-06 10:46:49 -0700 | [diff] [blame] | 1693 | long long lld; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1694 | long ld; |
| 1695 | Py_ssize_t zd; |
| 1696 | double d; |
| 1697 | unsigned char uc; |
| 1698 | void *p; |
| 1699 | |
| 1700 | switch (fmt[0]) { |
| 1701 | |
| 1702 | /* signed integers and fast path for 'B' */ |
Andy Lester | e6be9b5 | 2020-02-11 20:28:35 -0600 | [diff] [blame] | 1703 | case 'B': uc = *((const unsigned char *)ptr); goto convert_uc; |
| 1704 | case 'b': ld = *((const signed char *)ptr); goto convert_ld; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1705 | case 'h': UNPACK_SINGLE(ld, ptr, short); goto convert_ld; |
| 1706 | case 'i': UNPACK_SINGLE(ld, ptr, int); goto convert_ld; |
| 1707 | case 'l': UNPACK_SINGLE(ld, ptr, long); goto convert_ld; |
| 1708 | |
| 1709 | /* boolean */ |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1710 | case '?': UNPACK_SINGLE(ld, ptr, _Bool); goto convert_bool; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1711 | |
| 1712 | /* unsigned integers */ |
| 1713 | case 'H': UNPACK_SINGLE(lu, ptr, unsigned short); goto convert_lu; |
| 1714 | case 'I': UNPACK_SINGLE(lu, ptr, unsigned int); goto convert_lu; |
| 1715 | case 'L': UNPACK_SINGLE(lu, ptr, unsigned long); goto convert_lu; |
| 1716 | |
| 1717 | /* native 64-bit */ |
Benjamin Peterson | af580df | 2016-09-06 10:46:49 -0700 | [diff] [blame] | 1718 | case 'q': UNPACK_SINGLE(lld, ptr, long long); goto convert_lld; |
| 1719 | case 'Q': UNPACK_SINGLE(llu, ptr, unsigned long long); goto convert_llu; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1720 | |
| 1721 | /* ssize_t and size_t */ |
| 1722 | case 'n': UNPACK_SINGLE(zd, ptr, Py_ssize_t); goto convert_zd; |
| 1723 | case 'N': UNPACK_SINGLE(zu, ptr, size_t); goto convert_zu; |
| 1724 | |
| 1725 | /* floats */ |
| 1726 | case 'f': UNPACK_SINGLE(d, ptr, float); goto convert_double; |
| 1727 | case 'd': UNPACK_SINGLE(d, ptr, double); goto convert_double; |
| 1728 | |
| 1729 | /* bytes object */ |
| 1730 | case 'c': goto convert_bytes; |
| 1731 | |
| 1732 | /* pointer */ |
| 1733 | case 'P': UNPACK_SINGLE(p, ptr, void *); goto convert_pointer; |
| 1734 | |
| 1735 | /* default */ |
| 1736 | default: goto err_format; |
| 1737 | } |
| 1738 | |
| 1739 | convert_uc: |
| 1740 | /* PyLong_FromUnsignedLong() is slower */ |
| 1741 | return PyLong_FromLong(uc); |
| 1742 | convert_ld: |
| 1743 | return PyLong_FromLong(ld); |
| 1744 | convert_lu: |
| 1745 | return PyLong_FromUnsignedLong(lu); |
| 1746 | convert_lld: |
| 1747 | return PyLong_FromLongLong(lld); |
| 1748 | convert_llu: |
| 1749 | return PyLong_FromUnsignedLongLong(llu); |
| 1750 | convert_zd: |
| 1751 | return PyLong_FromSsize_t(zd); |
| 1752 | convert_zu: |
| 1753 | return PyLong_FromSize_t(zu); |
| 1754 | convert_double: |
| 1755 | return PyFloat_FromDouble(d); |
| 1756 | convert_bool: |
| 1757 | return PyBool_FromLong(ld); |
| 1758 | convert_bytes: |
| 1759 | return PyBytes_FromStringAndSize(ptr, 1); |
| 1760 | convert_pointer: |
| 1761 | return PyLong_FromVoidPtr(p); |
| 1762 | err_format: |
| 1763 | PyErr_Format(PyExc_NotImplementedError, |
| 1764 | "memoryview: format %s not supported", fmt); |
| 1765 | return NULL; |
| 1766 | } |
| 1767 | |
| 1768 | #define PACK_SINGLE(ptr, src, type) \ |
| 1769 | do { \ |
| 1770 | type x; \ |
| 1771 | x = (type)src; \ |
| 1772 | memcpy(ptr, (char *)&x, sizeof x); \ |
| 1773 | } while (0) |
| 1774 | |
| 1775 | /* Pack a single item. 'fmt' can be any native format character in |
| 1776 | struct module syntax. */ |
| 1777 | static int |
| 1778 | pack_single(char *ptr, PyObject *item, const char *fmt) |
| 1779 | { |
Benjamin Peterson | af580df | 2016-09-06 10:46:49 -0700 | [diff] [blame] | 1780 | unsigned long long llu; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1781 | unsigned long lu; |
| 1782 | size_t zu; |
Benjamin Peterson | af580df | 2016-09-06 10:46:49 -0700 | [diff] [blame] | 1783 | long long lld; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1784 | long ld; |
| 1785 | Py_ssize_t zd; |
| 1786 | double d; |
| 1787 | void *p; |
| 1788 | |
| 1789 | switch (fmt[0]) { |
| 1790 | /* signed integers */ |
| 1791 | case 'b': case 'h': case 'i': case 'l': |
| 1792 | ld = pylong_as_ld(item); |
| 1793 | if (ld == -1 && PyErr_Occurred()) |
| 1794 | goto err_occurred; |
| 1795 | switch (fmt[0]) { |
| 1796 | case 'b': |
| 1797 | if (ld < SCHAR_MIN || ld > SCHAR_MAX) goto err_range; |
| 1798 | *((signed char *)ptr) = (signed char)ld; break; |
| 1799 | case 'h': |
| 1800 | if (ld < SHRT_MIN || ld > SHRT_MAX) goto err_range; |
| 1801 | PACK_SINGLE(ptr, ld, short); break; |
| 1802 | case 'i': |
| 1803 | if (ld < INT_MIN || ld > INT_MAX) goto err_range; |
| 1804 | PACK_SINGLE(ptr, ld, int); break; |
| 1805 | default: /* 'l' */ |
| 1806 | PACK_SINGLE(ptr, ld, long); break; |
| 1807 | } |
| 1808 | break; |
| 1809 | |
| 1810 | /* unsigned integers */ |
| 1811 | case 'B': case 'H': case 'I': case 'L': |
| 1812 | lu = pylong_as_lu(item); |
| 1813 | if (lu == (unsigned long)-1 && PyErr_Occurred()) |
| 1814 | goto err_occurred; |
| 1815 | switch (fmt[0]) { |
| 1816 | case 'B': |
| 1817 | if (lu > UCHAR_MAX) goto err_range; |
| 1818 | *((unsigned char *)ptr) = (unsigned char)lu; break; |
| 1819 | case 'H': |
| 1820 | if (lu > USHRT_MAX) goto err_range; |
| 1821 | PACK_SINGLE(ptr, lu, unsigned short); break; |
| 1822 | case 'I': |
| 1823 | if (lu > UINT_MAX) goto err_range; |
| 1824 | PACK_SINGLE(ptr, lu, unsigned int); break; |
| 1825 | default: /* 'L' */ |
| 1826 | PACK_SINGLE(ptr, lu, unsigned long); break; |
| 1827 | } |
| 1828 | break; |
| 1829 | |
| 1830 | /* native 64-bit */ |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1831 | case 'q': |
| 1832 | lld = pylong_as_lld(item); |
| 1833 | if (lld == -1 && PyErr_Occurred()) |
| 1834 | goto err_occurred; |
Benjamin Peterson | af580df | 2016-09-06 10:46:49 -0700 | [diff] [blame] | 1835 | PACK_SINGLE(ptr, lld, long long); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1836 | break; |
| 1837 | case 'Q': |
| 1838 | llu = pylong_as_llu(item); |
Benjamin Peterson | af580df | 2016-09-06 10:46:49 -0700 | [diff] [blame] | 1839 | if (llu == (unsigned long long)-1 && PyErr_Occurred()) |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1840 | goto err_occurred; |
Benjamin Peterson | af580df | 2016-09-06 10:46:49 -0700 | [diff] [blame] | 1841 | PACK_SINGLE(ptr, llu, unsigned long long); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1842 | break; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1843 | |
| 1844 | /* ssize_t and size_t */ |
| 1845 | case 'n': |
| 1846 | zd = pylong_as_zd(item); |
| 1847 | if (zd == -1 && PyErr_Occurred()) |
| 1848 | goto err_occurred; |
| 1849 | PACK_SINGLE(ptr, zd, Py_ssize_t); |
| 1850 | break; |
| 1851 | case 'N': |
| 1852 | zu = pylong_as_zu(item); |
| 1853 | if (zu == (size_t)-1 && PyErr_Occurred()) |
| 1854 | goto err_occurred; |
| 1855 | PACK_SINGLE(ptr, zu, size_t); |
| 1856 | break; |
| 1857 | |
| 1858 | /* floats */ |
| 1859 | case 'f': case 'd': |
| 1860 | d = PyFloat_AsDouble(item); |
| 1861 | if (d == -1.0 && PyErr_Occurred()) |
| 1862 | goto err_occurred; |
| 1863 | if (fmt[0] == 'f') { |
| 1864 | PACK_SINGLE(ptr, d, float); |
| 1865 | } |
| 1866 | else { |
| 1867 | PACK_SINGLE(ptr, d, double); |
| 1868 | } |
| 1869 | break; |
| 1870 | |
| 1871 | /* bool */ |
| 1872 | case '?': |
| 1873 | ld = PyObject_IsTrue(item); |
| 1874 | if (ld < 0) |
| 1875 | return -1; /* preserve original error */ |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1876 | PACK_SINGLE(ptr, ld, _Bool); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 1877 | break; |
| 1878 | |
| 1879 | /* bytes object */ |
| 1880 | case 'c': |
| 1881 | if (!PyBytes_Check(item)) |
| 1882 | return type_error_int(fmt); |
| 1883 | if (PyBytes_GET_SIZE(item) != 1) |
| 1884 | return value_error_int(fmt); |
| 1885 | *ptr = PyBytes_AS_STRING(item)[0]; |
| 1886 | break; |
| 1887 | |
| 1888 | /* pointer */ |
| 1889 | case 'P': |
| 1890 | p = PyLong_AsVoidPtr(item); |
| 1891 | if (p == NULL && PyErr_Occurred()) |
| 1892 | goto err_occurred; |
| 1893 | PACK_SINGLE(ptr, p, void *); |
| 1894 | break; |
| 1895 | |
| 1896 | /* default */ |
| 1897 | default: goto err_format; |
| 1898 | } |
| 1899 | |
| 1900 | return 0; |
| 1901 | |
| 1902 | err_occurred: |
| 1903 | return fix_error_int(fmt); |
| 1904 | err_range: |
| 1905 | return value_error_int(fmt); |
| 1906 | err_format: |
| 1907 | PyErr_Format(PyExc_NotImplementedError, |
| 1908 | "memoryview: format %s not supported", fmt); |
| 1909 | return -1; |
| 1910 | } |
| 1911 | |
| 1912 | |
| 1913 | /****************************************************************************/ |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 1914 | /* unpack using the struct module */ |
| 1915 | /****************************************************************************/ |
| 1916 | |
| 1917 | /* For reasonable performance it is necessary to cache all objects required |
| 1918 | for unpacking. An unpacker can handle the format passed to unpack_from(). |
| 1919 | Invariant: All pointer fields of the struct should either be NULL or valid |
| 1920 | pointers. */ |
| 1921 | struct unpacker { |
| 1922 | PyObject *unpack_from; /* Struct.unpack_from(format) */ |
| 1923 | PyObject *mview; /* cached memoryview */ |
| 1924 | char *item; /* buffer for mview */ |
| 1925 | Py_ssize_t itemsize; /* len(item) */ |
| 1926 | }; |
| 1927 | |
| 1928 | static struct unpacker * |
| 1929 | unpacker_new(void) |
| 1930 | { |
| 1931 | struct unpacker *x = PyMem_Malloc(sizeof *x); |
| 1932 | |
| 1933 | if (x == NULL) { |
| 1934 | PyErr_NoMemory(); |
| 1935 | return NULL; |
| 1936 | } |
| 1937 | |
| 1938 | x->unpack_from = NULL; |
| 1939 | x->mview = NULL; |
| 1940 | x->item = NULL; |
| 1941 | x->itemsize = 0; |
| 1942 | |
| 1943 | return x; |
| 1944 | } |
| 1945 | |
| 1946 | static void |
| 1947 | unpacker_free(struct unpacker *x) |
| 1948 | { |
| 1949 | if (x) { |
| 1950 | Py_XDECREF(x->unpack_from); |
| 1951 | Py_XDECREF(x->mview); |
| 1952 | PyMem_Free(x->item); |
| 1953 | PyMem_Free(x); |
| 1954 | } |
| 1955 | } |
| 1956 | |
| 1957 | /* Return a new unpacker for the given format. */ |
| 1958 | static struct unpacker * |
| 1959 | struct_get_unpacker(const char *fmt, Py_ssize_t itemsize) |
| 1960 | { |
| 1961 | PyObject *structmodule; /* XXX cache these two */ |
| 1962 | PyObject *Struct = NULL; /* XXX in globals? */ |
| 1963 | PyObject *structobj = NULL; |
| 1964 | PyObject *format = NULL; |
| 1965 | struct unpacker *x = NULL; |
| 1966 | |
| 1967 | structmodule = PyImport_ImportModule("struct"); |
| 1968 | if (structmodule == NULL) |
| 1969 | return NULL; |
| 1970 | |
| 1971 | Struct = PyObject_GetAttrString(structmodule, "Struct"); |
| 1972 | Py_DECREF(structmodule); |
| 1973 | if (Struct == NULL) |
| 1974 | return NULL; |
| 1975 | |
| 1976 | x = unpacker_new(); |
| 1977 | if (x == NULL) |
| 1978 | goto error; |
| 1979 | |
| 1980 | format = PyBytes_FromString(fmt); |
| 1981 | if (format == NULL) |
| 1982 | goto error; |
| 1983 | |
Petr Viktorin | ffd9753 | 2020-02-11 17:46:57 +0100 | [diff] [blame] | 1984 | structobj = PyObject_CallOneArg(Struct, format); |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 1985 | if (structobj == NULL) |
| 1986 | goto error; |
| 1987 | |
| 1988 | x->unpack_from = PyObject_GetAttrString(structobj, "unpack_from"); |
| 1989 | if (x->unpack_from == NULL) |
| 1990 | goto error; |
| 1991 | |
| 1992 | x->item = PyMem_Malloc(itemsize); |
| 1993 | if (x->item == NULL) { |
| 1994 | PyErr_NoMemory(); |
| 1995 | goto error; |
| 1996 | } |
| 1997 | x->itemsize = itemsize; |
| 1998 | |
| 1999 | x->mview = PyMemoryView_FromMemory(x->item, itemsize, PyBUF_WRITE); |
| 2000 | if (x->mview == NULL) |
| 2001 | goto error; |
| 2002 | |
| 2003 | |
| 2004 | out: |
| 2005 | Py_XDECREF(Struct); |
| 2006 | Py_XDECREF(format); |
| 2007 | Py_XDECREF(structobj); |
| 2008 | return x; |
| 2009 | |
| 2010 | error: |
| 2011 | unpacker_free(x); |
| 2012 | x = NULL; |
| 2013 | goto out; |
| 2014 | } |
| 2015 | |
| 2016 | /* unpack a single item */ |
| 2017 | static PyObject * |
| 2018 | struct_unpack_single(const char *ptr, struct unpacker *x) |
| 2019 | { |
| 2020 | PyObject *v; |
| 2021 | |
| 2022 | memcpy(x->item, ptr, x->itemsize); |
Petr Viktorin | ffd9753 | 2020-02-11 17:46:57 +0100 | [diff] [blame] | 2023 | v = PyObject_CallOneArg(x->unpack_from, x->mview); |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 2024 | if (v == NULL) |
| 2025 | return NULL; |
| 2026 | |
| 2027 | if (PyTuple_GET_SIZE(v) == 1) { |
| 2028 | PyObject *tmp = PyTuple_GET_ITEM(v, 0); |
| 2029 | Py_INCREF(tmp); |
| 2030 | Py_DECREF(v); |
| 2031 | return tmp; |
| 2032 | } |
| 2033 | |
| 2034 | return v; |
| 2035 | } |
| 2036 | |
| 2037 | |
| 2038 | /****************************************************************************/ |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2039 | /* Representations */ |
| 2040 | /****************************************************************************/ |
| 2041 | |
| 2042 | /* allow explicit form of native format */ |
Benjamin Peterson | 82cce4c | 2016-09-08 11:56:06 -0700 | [diff] [blame] | 2043 | static inline const char * |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2044 | adjust_fmt(const Py_buffer *view) |
| 2045 | { |
| 2046 | const char *fmt; |
| 2047 | |
| 2048 | fmt = (view->format[0] == '@') ? view->format+1 : view->format; |
| 2049 | if (fmt[0] && fmt[1] == '\0') |
| 2050 | return fmt; |
| 2051 | |
| 2052 | PyErr_Format(PyExc_NotImplementedError, |
| 2053 | "memoryview: unsupported format %s", view->format); |
| 2054 | return NULL; |
| 2055 | } |
| 2056 | |
| 2057 | /* Base case for multi-dimensional unpacking. Assumption: ndim == 1. */ |
| 2058 | static PyObject * |
| 2059 | tolist_base(const char *ptr, const Py_ssize_t *shape, |
| 2060 | const Py_ssize_t *strides, const Py_ssize_t *suboffsets, |
| 2061 | const char *fmt) |
| 2062 | { |
| 2063 | PyObject *lst, *item; |
| 2064 | Py_ssize_t i; |
| 2065 | |
| 2066 | lst = PyList_New(shape[0]); |
| 2067 | if (lst == NULL) |
| 2068 | return NULL; |
| 2069 | |
| 2070 | for (i = 0; i < shape[0]; ptr+=strides[0], i++) { |
Antoine Pitrou | 31084ba | 2015-03-19 23:29:36 +0100 | [diff] [blame] | 2071 | const char *xptr = ADJUST_PTR(ptr, suboffsets, 0); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2072 | item = unpack_single(xptr, fmt); |
| 2073 | if (item == NULL) { |
| 2074 | Py_DECREF(lst); |
| 2075 | return NULL; |
| 2076 | } |
| 2077 | PyList_SET_ITEM(lst, i, item); |
| 2078 | } |
| 2079 | |
| 2080 | return lst; |
| 2081 | } |
| 2082 | |
| 2083 | /* Unpack a multi-dimensional array into a nested list. |
| 2084 | Assumption: ndim >= 1. */ |
| 2085 | static PyObject * |
| 2086 | tolist_rec(const char *ptr, Py_ssize_t ndim, const Py_ssize_t *shape, |
| 2087 | const Py_ssize_t *strides, const Py_ssize_t *suboffsets, |
| 2088 | const char *fmt) |
| 2089 | { |
| 2090 | PyObject *lst, *item; |
| 2091 | Py_ssize_t i; |
| 2092 | |
| 2093 | assert(ndim >= 1); |
| 2094 | assert(shape != NULL); |
| 2095 | assert(strides != NULL); |
| 2096 | |
| 2097 | if (ndim == 1) |
| 2098 | return tolist_base(ptr, shape, strides, suboffsets, fmt); |
| 2099 | |
| 2100 | lst = PyList_New(shape[0]); |
| 2101 | if (lst == NULL) |
| 2102 | return NULL; |
| 2103 | |
| 2104 | for (i = 0; i < shape[0]; ptr+=strides[0], i++) { |
Antoine Pitrou | 31084ba | 2015-03-19 23:29:36 +0100 | [diff] [blame] | 2105 | const char *xptr = ADJUST_PTR(ptr, suboffsets, 0); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2106 | item = tolist_rec(xptr, ndim-1, shape+1, |
| 2107 | strides+1, suboffsets ? suboffsets+1 : NULL, |
| 2108 | fmt); |
| 2109 | if (item == NULL) { |
| 2110 | Py_DECREF(lst); |
| 2111 | return NULL; |
| 2112 | } |
| 2113 | PyList_SET_ITEM(lst, i, item); |
| 2114 | } |
| 2115 | |
| 2116 | return lst; |
| 2117 | } |
| 2118 | |
| 2119 | /* Return a list representation of the memoryview. Currently only buffers |
| 2120 | with native format strings are supported. */ |
Serhiy Storchaka | 80a5036 | 2020-07-18 11:12:05 +0300 | [diff] [blame] | 2121 | /*[clinic input] |
| 2122 | memoryview.tolist |
| 2123 | |
| 2124 | Return the data in the buffer as a list of elements. |
| 2125 | [clinic start generated code]*/ |
| 2126 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2127 | static PyObject * |
Serhiy Storchaka | 80a5036 | 2020-07-18 11:12:05 +0300 | [diff] [blame] | 2128 | memoryview_tolist_impl(PyMemoryViewObject *self) |
| 2129 | /*[clinic end generated code: output=a6cda89214fd5a1b input=21e7d0c1860b211a]*/ |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2130 | { |
Serhiy Storchaka | 80a5036 | 2020-07-18 11:12:05 +0300 | [diff] [blame] | 2131 | const Py_buffer *view = &self->view; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2132 | const char *fmt; |
| 2133 | |
Serhiy Storchaka | 80a5036 | 2020-07-18 11:12:05 +0300 | [diff] [blame] | 2134 | CHECK_RELEASED(self); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2135 | |
| 2136 | fmt = adjust_fmt(view); |
| 2137 | if (fmt == NULL) |
| 2138 | return NULL; |
| 2139 | if (view->ndim == 0) { |
| 2140 | return unpack_single(view->buf, fmt); |
| 2141 | } |
| 2142 | else if (view->ndim == 1) { |
| 2143 | return tolist_base(view->buf, view->shape, |
| 2144 | view->strides, view->suboffsets, |
| 2145 | fmt); |
| 2146 | } |
| 2147 | else { |
| 2148 | return tolist_rec(view->buf, view->ndim, view->shape, |
| 2149 | view->strides, view->suboffsets, |
| 2150 | fmt); |
| 2151 | } |
| 2152 | } |
| 2153 | |
Serhiy Storchaka | 80a5036 | 2020-07-18 11:12:05 +0300 | [diff] [blame] | 2154 | /*[clinic input] |
| 2155 | memoryview.tobytes |
| 2156 | |
| 2157 | order: str(accept={str, NoneType}, c_default="NULL") = 'C' |
| 2158 | |
| 2159 | Return the data in the buffer as a byte string. |
| 2160 | |
| 2161 | Order can be {'C', 'F', 'A'}. When order is 'C' or 'F', the data of the |
| 2162 | original array is converted to C or Fortran order. For contiguous views, |
| 2163 | 'A' returns an exact copy of the physical memory. In particular, in-memory |
| 2164 | Fortran order is preserved. For non-contiguous views, the data is converted |
| 2165 | to C first. order=None is the same as order='C'. |
| 2166 | [clinic start generated code]*/ |
| 2167 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2168 | static PyObject * |
Serhiy Storchaka | 80a5036 | 2020-07-18 11:12:05 +0300 | [diff] [blame] | 2169 | memoryview_tobytes_impl(PyMemoryViewObject *self, const char *order) |
| 2170 | /*[clinic end generated code: output=1288b62560a32a23 input=0efa3ddaeda573a8]*/ |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2171 | { |
| 2172 | Py_buffer *src = VIEW_ADDR(self); |
Stefan Krah | d08ea70 | 2019-02-02 18:57:41 +0100 | [diff] [blame] | 2173 | char ord = 'C'; |
| 2174 | PyObject *bytes; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2175 | |
| 2176 | CHECK_RELEASED(self); |
| 2177 | |
Stefan Krah | d08ea70 | 2019-02-02 18:57:41 +0100 | [diff] [blame] | 2178 | if (order) { |
| 2179 | if (strcmp(order, "F") == 0) { |
| 2180 | ord = 'F'; |
| 2181 | } |
| 2182 | else if (strcmp(order, "A") == 0) { |
| 2183 | ord = 'A'; |
| 2184 | } |
| 2185 | else if (strcmp(order, "C") != 0) { |
| 2186 | PyErr_SetString(PyExc_ValueError, |
| 2187 | "order must be 'C', 'F' or 'A'"); |
| 2188 | return NULL; |
| 2189 | } |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2190 | } |
| 2191 | |
| 2192 | bytes = PyBytes_FromStringAndSize(NULL, src->len); |
| 2193 | if (bytes == NULL) |
| 2194 | return NULL; |
| 2195 | |
Stefan Krah | d08ea70 | 2019-02-02 18:57:41 +0100 | [diff] [blame] | 2196 | if (PyBuffer_ToContiguous(PyBytes_AS_STRING(bytes), src, src->len, ord) < 0) { |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2197 | Py_DECREF(bytes); |
| 2198 | return NULL; |
| 2199 | } |
| 2200 | |
| 2201 | return bytes; |
| 2202 | } |
| 2203 | |
Gregory P. Smith | 0c2f930 | 2019-05-29 11:46:58 -0700 | [diff] [blame] | 2204 | /*[clinic input] |
| 2205 | memoryview.hex |
| 2206 | |
| 2207 | sep: object = NULL |
| 2208 | An optional single character or byte to separate hex bytes. |
| 2209 | bytes_per_sep: int = 1 |
| 2210 | How many bytes between separators. Positive values count from the |
| 2211 | right, negative values count from the left. |
| 2212 | |
| 2213 | Return the data in the buffer as a str of hexadecimal numbers. |
| 2214 | |
| 2215 | Example: |
| 2216 | >>> value = memoryview(b'\xb9\x01\xef') |
| 2217 | >>> value.hex() |
| 2218 | 'b901ef' |
| 2219 | >>> value.hex(':') |
| 2220 | 'b9:01:ef' |
| 2221 | >>> value.hex(':', 2) |
| 2222 | 'b9:01ef' |
| 2223 | >>> value.hex(':', -2) |
| 2224 | 'b901:ef' |
| 2225 | [clinic start generated code]*/ |
| 2226 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2227 | static PyObject * |
Gregory P. Smith | 0c2f930 | 2019-05-29 11:46:58 -0700 | [diff] [blame] | 2228 | memoryview_hex_impl(PyMemoryViewObject *self, PyObject *sep, |
| 2229 | int bytes_per_sep) |
| 2230 | /*[clinic end generated code: output=430ca760f94f3ca7 input=539f6a3a5fb56946]*/ |
Gregory P. Smith | 8cb6569 | 2015-04-25 23:22:26 +0000 | [diff] [blame] | 2231 | { |
| 2232 | Py_buffer *src = VIEW_ADDR(self); |
Stefan Krah | 0ce5b6e | 2015-11-10 18:17:22 +0100 | [diff] [blame] | 2233 | PyObject *bytes; |
| 2234 | PyObject *ret; |
| 2235 | |
Gregory P. Smith | 8cb6569 | 2015-04-25 23:22:26 +0000 | [diff] [blame] | 2236 | CHECK_RELEASED(self); |
Stefan Krah | 0ce5b6e | 2015-11-10 18:17:22 +0100 | [diff] [blame] | 2237 | |
| 2238 | if (MV_C_CONTIGUOUS(self->flags)) { |
Gregory P. Smith | 0c2f930 | 2019-05-29 11:46:58 -0700 | [diff] [blame] | 2239 | return _Py_strhex_with_sep(src->buf, src->len, sep, bytes_per_sep); |
Stefan Krah | 0ce5b6e | 2015-11-10 18:17:22 +0100 | [diff] [blame] | 2240 | } |
| 2241 | |
Stefan Krah | d08ea70 | 2019-02-02 18:57:41 +0100 | [diff] [blame] | 2242 | bytes = PyBytes_FromStringAndSize(NULL, src->len); |
Stefan Krah | 0ce5b6e | 2015-11-10 18:17:22 +0100 | [diff] [blame] | 2243 | if (bytes == NULL) |
| 2244 | return NULL; |
| 2245 | |
Stefan Krah | d08ea70 | 2019-02-02 18:57:41 +0100 | [diff] [blame] | 2246 | if (PyBuffer_ToContiguous(PyBytes_AS_STRING(bytes), src, src->len, 'C') < 0) { |
| 2247 | Py_DECREF(bytes); |
| 2248 | return NULL; |
| 2249 | } |
| 2250 | |
Gregory P. Smith | 0c2f930 | 2019-05-29 11:46:58 -0700 | [diff] [blame] | 2251 | ret = _Py_strhex_with_sep( |
| 2252 | PyBytes_AS_STRING(bytes), PyBytes_GET_SIZE(bytes), |
| 2253 | sep, bytes_per_sep); |
Stefan Krah | 0ce5b6e | 2015-11-10 18:17:22 +0100 | [diff] [blame] | 2254 | Py_DECREF(bytes); |
| 2255 | |
| 2256 | return ret; |
Gregory P. Smith | 8cb6569 | 2015-04-25 23:22:26 +0000 | [diff] [blame] | 2257 | } |
| 2258 | |
| 2259 | static PyObject * |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2260 | memory_repr(PyMemoryViewObject *self) |
| 2261 | { |
| 2262 | if (self->flags & _Py_MEMORYVIEW_RELEASED) |
| 2263 | return PyUnicode_FromFormat("<released memory at %p>", self); |
| 2264 | else |
| 2265 | return PyUnicode_FromFormat("<memory at %p>", self); |
| 2266 | } |
| 2267 | |
| 2268 | |
| 2269 | /**************************************************************************/ |
| 2270 | /* Indexing and slicing */ |
| 2271 | /**************************************************************************/ |
| 2272 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2273 | static char * |
Antoine Pitrou | 31084ba | 2015-03-19 23:29:36 +0100 | [diff] [blame] | 2274 | lookup_dimension(Py_buffer *view, char *ptr, int dim, Py_ssize_t index) |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2275 | { |
Antoine Pitrou | 31084ba | 2015-03-19 23:29:36 +0100 | [diff] [blame] | 2276 | Py_ssize_t nitems; /* items in the given dimension */ |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2277 | |
| 2278 | assert(view->shape); |
| 2279 | assert(view->strides); |
| 2280 | |
Antoine Pitrou | 31084ba | 2015-03-19 23:29:36 +0100 | [diff] [blame] | 2281 | nitems = view->shape[dim]; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2282 | if (index < 0) { |
| 2283 | index += nitems; |
| 2284 | } |
| 2285 | if (index < 0 || index >= nitems) { |
Antoine Pitrou | 31084ba | 2015-03-19 23:29:36 +0100 | [diff] [blame] | 2286 | PyErr_Format(PyExc_IndexError, |
| 2287 | "index out of bounds on dimension %d", dim + 1); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2288 | return NULL; |
| 2289 | } |
| 2290 | |
Antoine Pitrou | 31084ba | 2015-03-19 23:29:36 +0100 | [diff] [blame] | 2291 | ptr += view->strides[dim] * index; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2292 | |
Antoine Pitrou | 31084ba | 2015-03-19 23:29:36 +0100 | [diff] [blame] | 2293 | ptr = ADJUST_PTR(ptr, view->suboffsets, dim); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2294 | |
| 2295 | return ptr; |
| 2296 | } |
| 2297 | |
Antoine Pitrou | 31084ba | 2015-03-19 23:29:36 +0100 | [diff] [blame] | 2298 | /* Get the pointer to the item at index. */ |
| 2299 | static char * |
| 2300 | ptr_from_index(Py_buffer *view, Py_ssize_t index) |
| 2301 | { |
| 2302 | char *ptr = (char *)view->buf; |
| 2303 | return lookup_dimension(view, ptr, 0, index); |
| 2304 | } |
| 2305 | |
| 2306 | /* Get the pointer to the item at tuple. */ |
| 2307 | static char * |
| 2308 | ptr_from_tuple(Py_buffer *view, PyObject *tup) |
| 2309 | { |
| 2310 | char *ptr = (char *)view->buf; |
| 2311 | Py_ssize_t dim, nindices = PyTuple_GET_SIZE(tup); |
| 2312 | |
| 2313 | if (nindices > view->ndim) { |
| 2314 | PyErr_Format(PyExc_TypeError, |
| 2315 | "cannot index %zd-dimension view with %zd-element tuple", |
| 2316 | view->ndim, nindices); |
| 2317 | return NULL; |
| 2318 | } |
| 2319 | |
| 2320 | for (dim = 0; dim < nindices; dim++) { |
| 2321 | Py_ssize_t index; |
| 2322 | index = PyNumber_AsSsize_t(PyTuple_GET_ITEM(tup, dim), |
| 2323 | PyExc_IndexError); |
| 2324 | if (index == -1 && PyErr_Occurred()) |
| 2325 | return NULL; |
Stefan Krah | 7c3f385 | 2015-11-10 18:35:19 +0100 | [diff] [blame] | 2326 | ptr = lookup_dimension(view, ptr, (int)dim, index); |
Antoine Pitrou | 31084ba | 2015-03-19 23:29:36 +0100 | [diff] [blame] | 2327 | if (ptr == NULL) |
| 2328 | return NULL; |
| 2329 | } |
| 2330 | return ptr; |
| 2331 | } |
| 2332 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2333 | /* Return the item at index. In a one-dimensional view, this is an object |
| 2334 | with the type specified by view->format. Otherwise, the item is a sub-view. |
| 2335 | The function is used in memory_subscript() and memory_as_sequence. */ |
| 2336 | static PyObject * |
| 2337 | memory_item(PyMemoryViewObject *self, Py_ssize_t index) |
| 2338 | { |
| 2339 | Py_buffer *view = &(self->view); |
| 2340 | const char *fmt; |
| 2341 | |
| 2342 | CHECK_RELEASED(self); |
| 2343 | |
| 2344 | fmt = adjust_fmt(view); |
| 2345 | if (fmt == NULL) |
| 2346 | return NULL; |
| 2347 | |
| 2348 | if (view->ndim == 0) { |
| 2349 | PyErr_SetString(PyExc_TypeError, "invalid indexing of 0-dim memory"); |
| 2350 | return NULL; |
| 2351 | } |
| 2352 | if (view->ndim == 1) { |
| 2353 | char *ptr = ptr_from_index(view, index); |
| 2354 | if (ptr == NULL) |
| 2355 | return NULL; |
| 2356 | return unpack_single(ptr, fmt); |
| 2357 | } |
| 2358 | |
| 2359 | PyErr_SetString(PyExc_NotImplementedError, |
| 2360 | "multi-dimensional sub-views are not implemented"); |
| 2361 | return NULL; |
| 2362 | } |
| 2363 | |
Antoine Pitrou | 31084ba | 2015-03-19 23:29:36 +0100 | [diff] [blame] | 2364 | /* Return the item at position *key* (a tuple of indices). */ |
| 2365 | static PyObject * |
| 2366 | memory_item_multi(PyMemoryViewObject *self, PyObject *tup) |
| 2367 | { |
| 2368 | Py_buffer *view = &(self->view); |
| 2369 | const char *fmt; |
| 2370 | Py_ssize_t nindices = PyTuple_GET_SIZE(tup); |
| 2371 | char *ptr; |
| 2372 | |
| 2373 | CHECK_RELEASED(self); |
| 2374 | |
| 2375 | fmt = adjust_fmt(view); |
| 2376 | if (fmt == NULL) |
| 2377 | return NULL; |
| 2378 | |
| 2379 | if (nindices < view->ndim) { |
| 2380 | PyErr_SetString(PyExc_NotImplementedError, |
| 2381 | "sub-views are not implemented"); |
| 2382 | return NULL; |
| 2383 | } |
| 2384 | ptr = ptr_from_tuple(view, tup); |
| 2385 | if (ptr == NULL) |
| 2386 | return NULL; |
| 2387 | return unpack_single(ptr, fmt); |
| 2388 | } |
| 2389 | |
Benjamin Peterson | 82cce4c | 2016-09-08 11:56:06 -0700 | [diff] [blame] | 2390 | static inline int |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2391 | init_slice(Py_buffer *base, PyObject *key, int dim) |
| 2392 | { |
| 2393 | Py_ssize_t start, stop, step, slicelength; |
| 2394 | |
Serhiy Storchaka | b879fe8 | 2017-04-08 09:53:51 +0300 | [diff] [blame] | 2395 | if (PySlice_Unpack(key, &start, &stop, &step) < 0) { |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2396 | return -1; |
| 2397 | } |
Serhiy Storchaka | b879fe8 | 2017-04-08 09:53:51 +0300 | [diff] [blame] | 2398 | slicelength = PySlice_AdjustIndices(base->shape[dim], &start, &stop, step); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2399 | |
| 2400 | |
| 2401 | if (base->suboffsets == NULL || dim == 0) { |
| 2402 | adjust_buf: |
| 2403 | base->buf = (char *)base->buf + base->strides[dim] * start; |
| 2404 | } |
| 2405 | else { |
| 2406 | Py_ssize_t n = dim-1; |
| 2407 | while (n >= 0 && base->suboffsets[n] < 0) |
| 2408 | n--; |
| 2409 | if (n < 0) |
| 2410 | goto adjust_buf; /* all suboffsets are negative */ |
| 2411 | base->suboffsets[n] = base->suboffsets[n] + base->strides[dim] * start; |
| 2412 | } |
| 2413 | base->shape[dim] = slicelength; |
| 2414 | base->strides[dim] = base->strides[dim] * step; |
| 2415 | |
| 2416 | return 0; |
| 2417 | } |
| 2418 | |
| 2419 | static int |
| 2420 | is_multislice(PyObject *key) |
| 2421 | { |
| 2422 | Py_ssize_t size, i; |
| 2423 | |
| 2424 | if (!PyTuple_Check(key)) |
| 2425 | return 0; |
| 2426 | size = PyTuple_GET_SIZE(key); |
| 2427 | if (size == 0) |
| 2428 | return 0; |
| 2429 | |
| 2430 | for (i = 0; i < size; i++) { |
| 2431 | PyObject *x = PyTuple_GET_ITEM(key, i); |
| 2432 | if (!PySlice_Check(x)) |
| 2433 | return 0; |
| 2434 | } |
| 2435 | return 1; |
| 2436 | } |
| 2437 | |
Antoine Pitrou | 31084ba | 2015-03-19 23:29:36 +0100 | [diff] [blame] | 2438 | static Py_ssize_t |
| 2439 | is_multiindex(PyObject *key) |
| 2440 | { |
| 2441 | Py_ssize_t size, i; |
| 2442 | |
| 2443 | if (!PyTuple_Check(key)) |
| 2444 | return 0; |
| 2445 | size = PyTuple_GET_SIZE(key); |
| 2446 | for (i = 0; i < size; i++) { |
| 2447 | PyObject *x = PyTuple_GET_ITEM(key, i); |
Victor Stinner | a15e260 | 2020-04-08 02:01:56 +0200 | [diff] [blame] | 2448 | if (!_PyIndex_Check(x)) { |
Antoine Pitrou | 31084ba | 2015-03-19 23:29:36 +0100 | [diff] [blame] | 2449 | return 0; |
Victor Stinner | a15e260 | 2020-04-08 02:01:56 +0200 | [diff] [blame] | 2450 | } |
Antoine Pitrou | 31084ba | 2015-03-19 23:29:36 +0100 | [diff] [blame] | 2451 | } |
| 2452 | return 1; |
| 2453 | } |
| 2454 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2455 | /* mv[obj] returns an object holding the data for one element if obj |
| 2456 | fully indexes the memoryview or another memoryview object if it |
| 2457 | does not. |
| 2458 | |
| 2459 | 0-d memoryview objects can be referenced using mv[...] or mv[()] |
| 2460 | but not with anything else. */ |
| 2461 | static PyObject * |
| 2462 | memory_subscript(PyMemoryViewObject *self, PyObject *key) |
| 2463 | { |
| 2464 | Py_buffer *view; |
| 2465 | view = &(self->view); |
Serhiy Storchaka | 009b811 | 2015-03-18 21:53:15 +0200 | [diff] [blame] | 2466 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2467 | CHECK_RELEASED(self); |
| 2468 | |
| 2469 | if (view->ndim == 0) { |
| 2470 | if (PyTuple_Check(key) && PyTuple_GET_SIZE(key) == 0) { |
| 2471 | const char *fmt = adjust_fmt(view); |
| 2472 | if (fmt == NULL) |
| 2473 | return NULL; |
| 2474 | return unpack_single(view->buf, fmt); |
| 2475 | } |
| 2476 | else if (key == Py_Ellipsis) { |
| 2477 | Py_INCREF(self); |
| 2478 | return (PyObject *)self; |
| 2479 | } |
| 2480 | else { |
| 2481 | PyErr_SetString(PyExc_TypeError, |
| 2482 | "invalid indexing of 0-dim memory"); |
| 2483 | return NULL; |
| 2484 | } |
| 2485 | } |
| 2486 | |
Victor Stinner | a15e260 | 2020-04-08 02:01:56 +0200 | [diff] [blame] | 2487 | if (_PyIndex_Check(key)) { |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2488 | Py_ssize_t index; |
| 2489 | index = PyNumber_AsSsize_t(key, PyExc_IndexError); |
| 2490 | if (index == -1 && PyErr_Occurred()) |
| 2491 | return NULL; |
| 2492 | return memory_item(self, index); |
| 2493 | } |
| 2494 | else if (PySlice_Check(key)) { |
| 2495 | PyMemoryViewObject *sliced; |
| 2496 | |
| 2497 | sliced = (PyMemoryViewObject *)mbuf_add_view(self->mbuf, view); |
| 2498 | if (sliced == NULL) |
| 2499 | return NULL; |
| 2500 | |
| 2501 | if (init_slice(&sliced->view, key, 0) < 0) { |
| 2502 | Py_DECREF(sliced); |
| 2503 | return NULL; |
| 2504 | } |
| 2505 | init_len(&sliced->view); |
| 2506 | init_flags(sliced); |
| 2507 | |
| 2508 | return (PyObject *)sliced; |
| 2509 | } |
Antoine Pitrou | 31084ba | 2015-03-19 23:29:36 +0100 | [diff] [blame] | 2510 | else if (is_multiindex(key)) { |
| 2511 | return memory_item_multi(self, key); |
| 2512 | } |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2513 | else if (is_multislice(key)) { |
| 2514 | PyErr_SetString(PyExc_NotImplementedError, |
| 2515 | "multi-dimensional slicing is not implemented"); |
| 2516 | return NULL; |
| 2517 | } |
| 2518 | |
| 2519 | PyErr_SetString(PyExc_TypeError, "memoryview: invalid slice key"); |
| 2520 | return NULL; |
| 2521 | } |
| 2522 | |
| 2523 | static int |
| 2524 | memory_ass_sub(PyMemoryViewObject *self, PyObject *key, PyObject *value) |
| 2525 | { |
| 2526 | Py_buffer *view = &(self->view); |
| 2527 | Py_buffer src; |
| 2528 | const char *fmt; |
| 2529 | char *ptr; |
| 2530 | |
| 2531 | CHECK_RELEASED_INT(self); |
| 2532 | |
| 2533 | fmt = adjust_fmt(view); |
| 2534 | if (fmt == NULL) |
| 2535 | return -1; |
| 2536 | |
| 2537 | if (view->readonly) { |
| 2538 | PyErr_SetString(PyExc_TypeError, "cannot modify read-only memory"); |
| 2539 | return -1; |
| 2540 | } |
| 2541 | if (value == NULL) { |
| 2542 | PyErr_SetString(PyExc_TypeError, "cannot delete memory"); |
| 2543 | return -1; |
| 2544 | } |
| 2545 | if (view->ndim == 0) { |
| 2546 | if (key == Py_Ellipsis || |
| 2547 | (PyTuple_Check(key) && PyTuple_GET_SIZE(key)==0)) { |
| 2548 | ptr = (char *)view->buf; |
| 2549 | return pack_single(ptr, value, fmt); |
| 2550 | } |
| 2551 | else { |
| 2552 | PyErr_SetString(PyExc_TypeError, |
| 2553 | "invalid indexing of 0-dim memory"); |
| 2554 | return -1; |
| 2555 | } |
| 2556 | } |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2557 | |
Victor Stinner | a15e260 | 2020-04-08 02:01:56 +0200 | [diff] [blame] | 2558 | if (_PyIndex_Check(key)) { |
Antoine Pitrou | 31084ba | 2015-03-19 23:29:36 +0100 | [diff] [blame] | 2559 | Py_ssize_t index; |
| 2560 | if (1 < view->ndim) { |
| 2561 | PyErr_SetString(PyExc_NotImplementedError, |
| 2562 | "sub-views are not implemented"); |
| 2563 | return -1; |
| 2564 | } |
| 2565 | index = PyNumber_AsSsize_t(key, PyExc_IndexError); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2566 | if (index == -1 && PyErr_Occurred()) |
| 2567 | return -1; |
| 2568 | ptr = ptr_from_index(view, index); |
| 2569 | if (ptr == NULL) |
| 2570 | return -1; |
| 2571 | return pack_single(ptr, value, fmt); |
| 2572 | } |
| 2573 | /* one-dimensional: fast path */ |
| 2574 | if (PySlice_Check(key) && view->ndim == 1) { |
| 2575 | Py_buffer dest; /* sliced view */ |
| 2576 | Py_ssize_t arrays[3]; |
| 2577 | int ret = -1; |
| 2578 | |
| 2579 | /* rvalue must be an exporter */ |
| 2580 | if (PyObject_GetBuffer(value, &src, PyBUF_FULL_RO) < 0) |
| 2581 | return ret; |
| 2582 | |
| 2583 | dest = *view; |
| 2584 | dest.shape = &arrays[0]; dest.shape[0] = view->shape[0]; |
| 2585 | dest.strides = &arrays[1]; dest.strides[0] = view->strides[0]; |
| 2586 | if (view->suboffsets) { |
| 2587 | dest.suboffsets = &arrays[2]; dest.suboffsets[0] = view->suboffsets[0]; |
| 2588 | } |
| 2589 | |
| 2590 | if (init_slice(&dest, key, 0) < 0) |
| 2591 | goto end_block; |
| 2592 | dest.len = dest.shape[0] * dest.itemsize; |
| 2593 | |
| 2594 | ret = copy_single(&dest, &src); |
| 2595 | |
| 2596 | end_block: |
| 2597 | PyBuffer_Release(&src); |
| 2598 | return ret; |
| 2599 | } |
Antoine Pitrou | 31084ba | 2015-03-19 23:29:36 +0100 | [diff] [blame] | 2600 | if (is_multiindex(key)) { |
| 2601 | char *ptr; |
| 2602 | if (PyTuple_GET_SIZE(key) < view->ndim) { |
| 2603 | PyErr_SetString(PyExc_NotImplementedError, |
| 2604 | "sub-views are not implemented"); |
| 2605 | return -1; |
| 2606 | } |
| 2607 | ptr = ptr_from_tuple(view, key); |
| 2608 | if (ptr == NULL) |
| 2609 | return -1; |
| 2610 | return pack_single(ptr, value, fmt); |
| 2611 | } |
| 2612 | if (PySlice_Check(key) || is_multislice(key)) { |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2613 | /* Call memory_subscript() to produce a sliced lvalue, then copy |
| 2614 | rvalue into lvalue. This is already implemented in _testbuffer.c. */ |
| 2615 | PyErr_SetString(PyExc_NotImplementedError, |
| 2616 | "memoryview slice assignments are currently restricted " |
| 2617 | "to ndim = 1"); |
| 2618 | return -1; |
| 2619 | } |
| 2620 | |
| 2621 | PyErr_SetString(PyExc_TypeError, "memoryview: invalid slice key"); |
| 2622 | return -1; |
| 2623 | } |
| 2624 | |
| 2625 | static Py_ssize_t |
| 2626 | memory_length(PyMemoryViewObject *self) |
| 2627 | { |
| 2628 | CHECK_RELEASED_INT(self); |
| 2629 | return self->view.ndim == 0 ? 1 : self->view.shape[0]; |
| 2630 | } |
| 2631 | |
| 2632 | /* As mapping */ |
| 2633 | static PyMappingMethods memory_as_mapping = { |
| 2634 | (lenfunc)memory_length, /* mp_length */ |
| 2635 | (binaryfunc)memory_subscript, /* mp_subscript */ |
| 2636 | (objobjargproc)memory_ass_sub, /* mp_ass_subscript */ |
| 2637 | }; |
| 2638 | |
| 2639 | /* As sequence */ |
| 2640 | static PySequenceMethods memory_as_sequence = { |
Nick Coghlan | a0f169c | 2013-10-02 22:06:54 +1000 | [diff] [blame] | 2641 | (lenfunc)memory_length, /* sq_length */ |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2642 | 0, /* sq_concat */ |
| 2643 | 0, /* sq_repeat */ |
| 2644 | (ssizeargfunc)memory_item, /* sq_item */ |
| 2645 | }; |
| 2646 | |
| 2647 | |
| 2648 | /**************************************************************************/ |
| 2649 | /* Comparisons */ |
| 2650 | /**************************************************************************/ |
| 2651 | |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 2652 | #define MV_COMPARE_EX -1 /* exception */ |
| 2653 | #define MV_COMPARE_NOT_IMPL -2 /* not implemented */ |
| 2654 | |
| 2655 | /* Translate a StructError to "not equal". Preserve other exceptions. */ |
| 2656 | static int |
| 2657 | fix_struct_error_int(void) |
| 2658 | { |
| 2659 | assert(PyErr_Occurred()); |
| 2660 | /* XXX Cannot get at StructError directly? */ |
| 2661 | if (PyErr_ExceptionMatches(PyExc_ImportError) || |
| 2662 | PyErr_ExceptionMatches(PyExc_MemoryError)) { |
| 2663 | return MV_COMPARE_EX; |
| 2664 | } |
| 2665 | /* StructError: invalid or unknown format -> not equal */ |
| 2666 | PyErr_Clear(); |
| 2667 | return 0; |
| 2668 | } |
| 2669 | |
| 2670 | /* Unpack and compare single items of p and q using the struct module. */ |
| 2671 | static int |
| 2672 | struct_unpack_cmp(const char *p, const char *q, |
| 2673 | struct unpacker *unpack_p, struct unpacker *unpack_q) |
| 2674 | { |
| 2675 | PyObject *v, *w; |
| 2676 | int ret; |
| 2677 | |
| 2678 | /* At this point any exception from the struct module should not be |
| 2679 | StructError, since both formats have been accepted already. */ |
| 2680 | v = struct_unpack_single(p, unpack_p); |
| 2681 | if (v == NULL) |
| 2682 | return MV_COMPARE_EX; |
| 2683 | |
| 2684 | w = struct_unpack_single(q, unpack_q); |
| 2685 | if (w == NULL) { |
| 2686 | Py_DECREF(v); |
| 2687 | return MV_COMPARE_EX; |
| 2688 | } |
| 2689 | |
| 2690 | /* MV_COMPARE_EX == -1: exceptions are preserved */ |
| 2691 | ret = PyObject_RichCompareBool(v, w, Py_EQ); |
| 2692 | Py_DECREF(v); |
| 2693 | Py_DECREF(w); |
| 2694 | |
| 2695 | return ret; |
| 2696 | } |
| 2697 | |
| 2698 | /* Unpack and compare single items of p and q. If both p and q have the same |
| 2699 | single element native format, the comparison uses a fast path (gcc creates |
| 2700 | a jump table and converts memcpy into simple assignments on x86/x64). |
| 2701 | |
| 2702 | Otherwise, the comparison is delegated to the struct module, which is |
| 2703 | 30-60x slower. */ |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2704 | #define CMP_SINGLE(p, q, type) \ |
| 2705 | do { \ |
| 2706 | type x; \ |
| 2707 | type y; \ |
| 2708 | memcpy((char *)&x, p, sizeof x); \ |
| 2709 | memcpy((char *)&y, q, sizeof y); \ |
| 2710 | equal = (x == y); \ |
| 2711 | } while (0) |
| 2712 | |
Benjamin Peterson | 82cce4c | 2016-09-08 11:56:06 -0700 | [diff] [blame] | 2713 | static inline int |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 2714 | unpack_cmp(const char *p, const char *q, char fmt, |
| 2715 | struct unpacker *unpack_p, struct unpacker *unpack_q) |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2716 | { |
| 2717 | int equal; |
| 2718 | |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 2719 | switch (fmt) { |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2720 | |
| 2721 | /* signed integers and fast path for 'B' */ |
Andy Lester | e6be9b5 | 2020-02-11 20:28:35 -0600 | [diff] [blame] | 2722 | case 'B': return *((const unsigned char *)p) == *((const unsigned char *)q); |
| 2723 | case 'b': return *((const signed char *)p) == *((const signed char *)q); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2724 | case 'h': CMP_SINGLE(p, q, short); return equal; |
| 2725 | case 'i': CMP_SINGLE(p, q, int); return equal; |
| 2726 | case 'l': CMP_SINGLE(p, q, long); return equal; |
| 2727 | |
| 2728 | /* boolean */ |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2729 | case '?': CMP_SINGLE(p, q, _Bool); return equal; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2730 | |
| 2731 | /* unsigned integers */ |
| 2732 | case 'H': CMP_SINGLE(p, q, unsigned short); return equal; |
| 2733 | case 'I': CMP_SINGLE(p, q, unsigned int); return equal; |
| 2734 | case 'L': CMP_SINGLE(p, q, unsigned long); return equal; |
| 2735 | |
| 2736 | /* native 64-bit */ |
Benjamin Peterson | af580df | 2016-09-06 10:46:49 -0700 | [diff] [blame] | 2737 | case 'q': CMP_SINGLE(p, q, long long); return equal; |
| 2738 | case 'Q': CMP_SINGLE(p, q, unsigned long long); return equal; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2739 | |
| 2740 | /* ssize_t and size_t */ |
| 2741 | case 'n': CMP_SINGLE(p, q, Py_ssize_t); return equal; |
| 2742 | case 'N': CMP_SINGLE(p, q, size_t); return equal; |
| 2743 | |
| 2744 | /* floats */ |
| 2745 | /* XXX DBL_EPSILON? */ |
| 2746 | case 'f': CMP_SINGLE(p, q, float); return equal; |
| 2747 | case 'd': CMP_SINGLE(p, q, double); return equal; |
| 2748 | |
| 2749 | /* bytes object */ |
| 2750 | case 'c': return *p == *q; |
| 2751 | |
| 2752 | /* pointer */ |
| 2753 | case 'P': CMP_SINGLE(p, q, void *); return equal; |
| 2754 | |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 2755 | /* use the struct module */ |
| 2756 | case '_': |
| 2757 | assert(unpack_p); |
| 2758 | assert(unpack_q); |
| 2759 | return struct_unpack_cmp(p, q, unpack_p, unpack_q); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2760 | } |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 2761 | |
| 2762 | /* NOT REACHED */ |
| 2763 | PyErr_SetString(PyExc_RuntimeError, |
| 2764 | "memoryview: internal error in richcompare"); |
| 2765 | return MV_COMPARE_EX; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2766 | } |
| 2767 | |
| 2768 | /* Base case for recursive array comparisons. Assumption: ndim == 1. */ |
| 2769 | static int |
| 2770 | cmp_base(const char *p, const char *q, const Py_ssize_t *shape, |
| 2771 | const Py_ssize_t *pstrides, const Py_ssize_t *psuboffsets, |
| 2772 | const Py_ssize_t *qstrides, const Py_ssize_t *qsuboffsets, |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 2773 | char fmt, struct unpacker *unpack_p, struct unpacker *unpack_q) |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2774 | { |
| 2775 | Py_ssize_t i; |
| 2776 | int equal; |
| 2777 | |
| 2778 | for (i = 0; i < shape[0]; p+=pstrides[0], q+=qstrides[0], i++) { |
Antoine Pitrou | 31084ba | 2015-03-19 23:29:36 +0100 | [diff] [blame] | 2779 | const char *xp = ADJUST_PTR(p, psuboffsets, 0); |
| 2780 | const char *xq = ADJUST_PTR(q, qsuboffsets, 0); |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 2781 | equal = unpack_cmp(xp, xq, fmt, unpack_p, unpack_q); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2782 | if (equal <= 0) |
| 2783 | return equal; |
| 2784 | } |
| 2785 | |
| 2786 | return 1; |
| 2787 | } |
| 2788 | |
| 2789 | /* Recursively compare two multi-dimensional arrays that have the same |
| 2790 | logical structure. Assumption: ndim >= 1. */ |
| 2791 | static int |
| 2792 | cmp_rec(const char *p, const char *q, |
| 2793 | Py_ssize_t ndim, const Py_ssize_t *shape, |
| 2794 | const Py_ssize_t *pstrides, const Py_ssize_t *psuboffsets, |
| 2795 | const Py_ssize_t *qstrides, const Py_ssize_t *qsuboffsets, |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 2796 | char fmt, struct unpacker *unpack_p, struct unpacker *unpack_q) |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2797 | { |
| 2798 | Py_ssize_t i; |
| 2799 | int equal; |
| 2800 | |
| 2801 | assert(ndim >= 1); |
| 2802 | assert(shape != NULL); |
| 2803 | assert(pstrides != NULL); |
| 2804 | assert(qstrides != NULL); |
| 2805 | |
| 2806 | if (ndim == 1) { |
| 2807 | return cmp_base(p, q, shape, |
| 2808 | pstrides, psuboffsets, |
| 2809 | qstrides, qsuboffsets, |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 2810 | fmt, unpack_p, unpack_q); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2811 | } |
| 2812 | |
| 2813 | for (i = 0; i < shape[0]; p+=pstrides[0], q+=qstrides[0], i++) { |
Antoine Pitrou | 31084ba | 2015-03-19 23:29:36 +0100 | [diff] [blame] | 2814 | const char *xp = ADJUST_PTR(p, psuboffsets, 0); |
| 2815 | const char *xq = ADJUST_PTR(q, qsuboffsets, 0); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2816 | equal = cmp_rec(xp, xq, ndim-1, shape+1, |
| 2817 | pstrides+1, psuboffsets ? psuboffsets+1 : NULL, |
| 2818 | qstrides+1, qsuboffsets ? qsuboffsets+1 : NULL, |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 2819 | fmt, unpack_p, unpack_q); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2820 | if (equal <= 0) |
| 2821 | return equal; |
| 2822 | } |
| 2823 | |
| 2824 | return 1; |
| 2825 | } |
| 2826 | |
| 2827 | static PyObject * |
| 2828 | memory_richcompare(PyObject *v, PyObject *w, int op) |
| 2829 | { |
| 2830 | PyObject *res; |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 2831 | Py_buffer wbuf, *vv; |
| 2832 | Py_buffer *ww = NULL; |
| 2833 | struct unpacker *unpack_v = NULL; |
| 2834 | struct unpacker *unpack_w = NULL; |
| 2835 | char vfmt, wfmt; |
| 2836 | int equal = MV_COMPARE_NOT_IMPL; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2837 | |
| 2838 | if (op != Py_EQ && op != Py_NE) |
| 2839 | goto result; /* Py_NotImplemented */ |
| 2840 | |
| 2841 | assert(PyMemoryView_Check(v)); |
| 2842 | if (BASE_INACCESSIBLE(v)) { |
| 2843 | equal = (v == w); |
| 2844 | goto result; |
| 2845 | } |
| 2846 | vv = VIEW_ADDR(v); |
| 2847 | |
| 2848 | if (PyMemoryView_Check(w)) { |
| 2849 | if (BASE_INACCESSIBLE(w)) { |
| 2850 | equal = (v == w); |
| 2851 | goto result; |
| 2852 | } |
| 2853 | ww = VIEW_ADDR(w); |
| 2854 | } |
| 2855 | else { |
| 2856 | if (PyObject_GetBuffer(w, &wbuf, PyBUF_FULL_RO) < 0) { |
| 2857 | PyErr_Clear(); |
| 2858 | goto result; /* Py_NotImplemented */ |
| 2859 | } |
| 2860 | ww = &wbuf; |
| 2861 | } |
| 2862 | |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 2863 | if (!equiv_shape(vv, ww)) { |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2864 | PyErr_Clear(); |
| 2865 | equal = 0; |
| 2866 | goto result; |
| 2867 | } |
| 2868 | |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 2869 | /* Use fast unpacking for identical primitive C type formats. */ |
| 2870 | if (get_native_fmtchar(&vfmt, vv->format) < 0) |
| 2871 | vfmt = '_'; |
| 2872 | if (get_native_fmtchar(&wfmt, ww->format) < 0) |
| 2873 | wfmt = '_'; |
| 2874 | if (vfmt == '_' || wfmt == '_' || vfmt != wfmt) { |
| 2875 | /* Use struct module unpacking. NOTE: Even for equal format strings, |
| 2876 | memcmp() cannot be used for item comparison since it would give |
| 2877 | incorrect results in the case of NaNs or uninitialized padding |
| 2878 | bytes. */ |
| 2879 | vfmt = '_'; |
| 2880 | unpack_v = struct_get_unpacker(vv->format, vv->itemsize); |
| 2881 | if (unpack_v == NULL) { |
| 2882 | equal = fix_struct_error_int(); |
| 2883 | goto result; |
| 2884 | } |
| 2885 | unpack_w = struct_get_unpacker(ww->format, ww->itemsize); |
| 2886 | if (unpack_w == NULL) { |
| 2887 | equal = fix_struct_error_int(); |
| 2888 | goto result; |
| 2889 | } |
| 2890 | } |
| 2891 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2892 | if (vv->ndim == 0) { |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 2893 | equal = unpack_cmp(vv->buf, ww->buf, |
| 2894 | vfmt, unpack_v, unpack_w); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2895 | } |
| 2896 | else if (vv->ndim == 1) { |
| 2897 | equal = cmp_base(vv->buf, ww->buf, vv->shape, |
| 2898 | vv->strides, vv->suboffsets, |
| 2899 | ww->strides, ww->suboffsets, |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 2900 | vfmt, unpack_v, unpack_w); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2901 | } |
| 2902 | else { |
| 2903 | equal = cmp_rec(vv->buf, ww->buf, vv->ndim, vv->shape, |
| 2904 | vv->strides, vv->suboffsets, |
| 2905 | ww->strides, ww->suboffsets, |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 2906 | vfmt, unpack_v, unpack_w); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2907 | } |
| 2908 | |
| 2909 | result: |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 2910 | if (equal < 0) { |
| 2911 | if (equal == MV_COMPARE_NOT_IMPL) |
| 2912 | res = Py_NotImplemented; |
| 2913 | else /* exception */ |
| 2914 | res = NULL; |
| 2915 | } |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2916 | else if ((equal && op == Py_EQ) || (!equal && op == Py_NE)) |
| 2917 | res = Py_True; |
| 2918 | else |
| 2919 | res = Py_False; |
| 2920 | |
| 2921 | if (ww == &wbuf) |
| 2922 | PyBuffer_Release(ww); |
Nick Coghlan | 06e1ab0 | 2012-08-25 17:59:50 +1000 | [diff] [blame] | 2923 | |
| 2924 | unpacker_free(unpack_v); |
| 2925 | unpacker_free(unpack_w); |
| 2926 | |
| 2927 | Py_XINCREF(res); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2928 | return res; |
| 2929 | } |
| 2930 | |
| 2931 | /**************************************************************************/ |
| 2932 | /* Hash */ |
| 2933 | /**************************************************************************/ |
| 2934 | |
| 2935 | static Py_hash_t |
| 2936 | memory_hash(PyMemoryViewObject *self) |
| 2937 | { |
| 2938 | if (self->hash == -1) { |
| 2939 | Py_buffer *view = &self->view; |
| 2940 | char *mem = view->buf; |
Stefan Krah | 4af77a0 | 2012-11-02 17:49:22 +0100 | [diff] [blame] | 2941 | Py_ssize_t ret; |
| 2942 | char fmt; |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2943 | |
| 2944 | CHECK_RELEASED_INT(self); |
| 2945 | |
| 2946 | if (!view->readonly) { |
| 2947 | PyErr_SetString(PyExc_ValueError, |
| 2948 | "cannot hash writable memoryview object"); |
| 2949 | return -1; |
| 2950 | } |
Stefan Krah | 4af77a0 | 2012-11-02 17:49:22 +0100 | [diff] [blame] | 2951 | ret = get_native_fmtchar(&fmt, view->format); |
| 2952 | if (ret < 0 || !IS_BYTE_FORMAT(fmt)) { |
| 2953 | PyErr_SetString(PyExc_ValueError, |
| 2954 | "memoryview: hashing is restricted to formats 'B', 'b' or 'c'"); |
| 2955 | return -1; |
| 2956 | } |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2957 | if (view->obj != NULL && PyObject_Hash(view->obj) == -1) { |
| 2958 | /* Keep the original error message */ |
| 2959 | return -1; |
| 2960 | } |
| 2961 | |
| 2962 | if (!MV_C_CONTIGUOUS(self->flags)) { |
| 2963 | mem = PyMem_Malloc(view->len); |
| 2964 | if (mem == NULL) { |
| 2965 | PyErr_NoMemory(); |
| 2966 | return -1; |
| 2967 | } |
Stefan Krah | 7d12d9d | 2012-07-28 12:25:55 +0200 | [diff] [blame] | 2968 | if (buffer_to_contiguous(mem, view, 'C') < 0) { |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2969 | PyMem_Free(mem); |
| 2970 | return -1; |
| 2971 | } |
| 2972 | } |
| 2973 | |
| 2974 | /* Can't fail */ |
Christian Heimes | 985ecdc | 2013-11-20 11:46:18 +0100 | [diff] [blame] | 2975 | self->hash = _Py_HashBytes(mem, view->len); |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 2976 | |
| 2977 | if (mem != view->buf) |
| 2978 | PyMem_Free(mem); |
| 2979 | } |
| 2980 | |
| 2981 | return self->hash; |
| 2982 | } |
| 2983 | |
| 2984 | |
| 2985 | /**************************************************************************/ |
| 2986 | /* getters */ |
| 2987 | /**************************************************************************/ |
| 2988 | |
| 2989 | static PyObject * |
| 2990 | _IntTupleFromSsizet(int len, Py_ssize_t *vals) |
| 2991 | { |
| 2992 | int i; |
| 2993 | PyObject *o; |
| 2994 | PyObject *intTuple; |
| 2995 | |
| 2996 | if (vals == NULL) |
| 2997 | return PyTuple_New(0); |
| 2998 | |
| 2999 | intTuple = PyTuple_New(len); |
| 3000 | if (!intTuple) |
| 3001 | return NULL; |
| 3002 | for (i=0; i<len; i++) { |
| 3003 | o = PyLong_FromSsize_t(vals[i]); |
| 3004 | if (!o) { |
| 3005 | Py_DECREF(intTuple); |
| 3006 | return NULL; |
| 3007 | } |
| 3008 | PyTuple_SET_ITEM(intTuple, i, o); |
| 3009 | } |
| 3010 | return intTuple; |
| 3011 | } |
| 3012 | |
| 3013 | static PyObject * |
Serhiy Storchaka | d4f9cf5 | 2018-11-27 19:34:35 +0200 | [diff] [blame] | 3014 | memory_obj_get(PyMemoryViewObject *self, void *Py_UNUSED(ignored)) |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 3015 | { |
| 3016 | Py_buffer *view = &self->view; |
| 3017 | |
| 3018 | CHECK_RELEASED(self); |
| 3019 | if (view->obj == NULL) { |
| 3020 | Py_RETURN_NONE; |
| 3021 | } |
| 3022 | Py_INCREF(view->obj); |
| 3023 | return view->obj; |
| 3024 | } |
| 3025 | |
| 3026 | static PyObject * |
Serhiy Storchaka | d4f9cf5 | 2018-11-27 19:34:35 +0200 | [diff] [blame] | 3027 | memory_nbytes_get(PyMemoryViewObject *self, void *Py_UNUSED(ignored)) |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 3028 | { |
| 3029 | CHECK_RELEASED(self); |
| 3030 | return PyLong_FromSsize_t(self->view.len); |
| 3031 | } |
| 3032 | |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 3033 | static PyObject * |
Serhiy Storchaka | d4f9cf5 | 2018-11-27 19:34:35 +0200 | [diff] [blame] | 3034 | memory_format_get(PyMemoryViewObject *self, void *Py_UNUSED(ignored)) |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 3035 | { |
Antoine Pitrou | 6e6cc83 | 2010-09-09 12:59:39 +0000 | [diff] [blame] | 3036 | CHECK_RELEASED(self); |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 3037 | return PyUnicode_FromString(self->view.format); |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 3038 | } |
| 3039 | |
| 3040 | static PyObject * |
Serhiy Storchaka | d4f9cf5 | 2018-11-27 19:34:35 +0200 | [diff] [blame] | 3041 | memory_itemsize_get(PyMemoryViewObject *self, void *Py_UNUSED(ignored)) |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 3042 | { |
Antoine Pitrou | 6e6cc83 | 2010-09-09 12:59:39 +0000 | [diff] [blame] | 3043 | CHECK_RELEASED(self); |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 3044 | return PyLong_FromSsize_t(self->view.itemsize); |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 3045 | } |
| 3046 | |
| 3047 | static PyObject * |
Serhiy Storchaka | d4f9cf5 | 2018-11-27 19:34:35 +0200 | [diff] [blame] | 3048 | memory_shape_get(PyMemoryViewObject *self, void *Py_UNUSED(ignored)) |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 3049 | { |
Antoine Pitrou | 6e6cc83 | 2010-09-09 12:59:39 +0000 | [diff] [blame] | 3050 | CHECK_RELEASED(self); |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 3051 | return _IntTupleFromSsizet(self->view.ndim, self->view.shape); |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 3052 | } |
| 3053 | |
| 3054 | static PyObject * |
Serhiy Storchaka | d4f9cf5 | 2018-11-27 19:34:35 +0200 | [diff] [blame] | 3055 | memory_strides_get(PyMemoryViewObject *self, void *Py_UNUSED(ignored)) |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 3056 | { |
Antoine Pitrou | 6e6cc83 | 2010-09-09 12:59:39 +0000 | [diff] [blame] | 3057 | CHECK_RELEASED(self); |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 3058 | return _IntTupleFromSsizet(self->view.ndim, self->view.strides); |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 3059 | } |
| 3060 | |
| 3061 | static PyObject * |
Serhiy Storchaka | d4f9cf5 | 2018-11-27 19:34:35 +0200 | [diff] [blame] | 3062 | memory_suboffsets_get(PyMemoryViewObject *self, void *Py_UNUSED(ignored)) |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 3063 | { |
Antoine Pitrou | 6e6cc83 | 2010-09-09 12:59:39 +0000 | [diff] [blame] | 3064 | CHECK_RELEASED(self); |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 3065 | return _IntTupleFromSsizet(self->view.ndim, self->view.suboffsets); |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 3066 | } |
| 3067 | |
| 3068 | static PyObject * |
Serhiy Storchaka | d4f9cf5 | 2018-11-27 19:34:35 +0200 | [diff] [blame] | 3069 | memory_readonly_get(PyMemoryViewObject *self, void *Py_UNUSED(ignored)) |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 3070 | { |
Antoine Pitrou | 6e6cc83 | 2010-09-09 12:59:39 +0000 | [diff] [blame] | 3071 | CHECK_RELEASED(self); |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 3072 | return PyBool_FromLong(self->view.readonly); |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 3073 | } |
| 3074 | |
| 3075 | static PyObject * |
Serhiy Storchaka | d4f9cf5 | 2018-11-27 19:34:35 +0200 | [diff] [blame] | 3076 | memory_ndim_get(PyMemoryViewObject *self, void *Py_UNUSED(ignored)) |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 3077 | { |
Antoine Pitrou | 6e6cc83 | 2010-09-09 12:59:39 +0000 | [diff] [blame] | 3078 | CHECK_RELEASED(self); |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 3079 | return PyLong_FromLong(self->view.ndim); |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 3080 | } |
| 3081 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 3082 | static PyObject * |
| 3083 | memory_c_contiguous(PyMemoryViewObject *self, PyObject *dummy) |
| 3084 | { |
| 3085 | CHECK_RELEASED(self); |
| 3086 | return PyBool_FromLong(MV_C_CONTIGUOUS(self->flags)); |
| 3087 | } |
| 3088 | |
| 3089 | static PyObject * |
| 3090 | memory_f_contiguous(PyMemoryViewObject *self, PyObject *dummy) |
| 3091 | { |
| 3092 | CHECK_RELEASED(self); |
| 3093 | return PyBool_FromLong(MV_F_CONTIGUOUS(self->flags)); |
| 3094 | } |
| 3095 | |
| 3096 | static PyObject * |
| 3097 | memory_contiguous(PyMemoryViewObject *self, PyObject *dummy) |
| 3098 | { |
| 3099 | CHECK_RELEASED(self); |
| 3100 | return PyBool_FromLong(MV_ANY_CONTIGUOUS(self->flags)); |
| 3101 | } |
| 3102 | |
Alexander Belopolsky | f73c69e | 2012-09-03 16:51:01 -0400 | [diff] [blame] | 3103 | PyDoc_STRVAR(memory_obj_doc, |
| 3104 | "The underlying object of the memoryview."); |
| 3105 | PyDoc_STRVAR(memory_nbytes_doc, |
| 3106 | "The amount of space in bytes that the array would use in\n" |
| 3107 | " a contiguous representation."); |
| 3108 | PyDoc_STRVAR(memory_readonly_doc, |
| 3109 | "A bool indicating whether the memory is read only."); |
| 3110 | PyDoc_STRVAR(memory_itemsize_doc, |
| 3111 | "The size in bytes of each element of the memoryview."); |
Alexander Belopolsky | 397e5c9 | 2012-09-03 16:29:11 -0400 | [diff] [blame] | 3112 | PyDoc_STRVAR(memory_format_doc, |
| 3113 | "A string containing the format (in struct module style)\n" |
| 3114 | " for each element in the view."); |
Alexander Belopolsky | f73c69e | 2012-09-03 16:51:01 -0400 | [diff] [blame] | 3115 | PyDoc_STRVAR(memory_ndim_doc, |
| 3116 | "An integer indicating how many dimensions of a multi-dimensional\n" |
| 3117 | " array the memory represents."); |
Alexander Belopolsky | 397e5c9 | 2012-09-03 16:29:11 -0400 | [diff] [blame] | 3118 | PyDoc_STRVAR(memory_shape_doc, |
| 3119 | "A tuple of ndim integers giving the shape of the memory\n" |
| 3120 | " as an N-dimensional array."); |
| 3121 | PyDoc_STRVAR(memory_strides_doc, |
| 3122 | "A tuple of ndim integers giving the size in bytes to access\n" |
| 3123 | " each element for each dimension of the array."); |
| 3124 | PyDoc_STRVAR(memory_suboffsets_doc, |
| 3125 | "A tuple of integers used internally for PIL-style arrays."); |
Alexander Belopolsky | f73c69e | 2012-09-03 16:51:01 -0400 | [diff] [blame] | 3126 | PyDoc_STRVAR(memory_c_contiguous_doc, |
| 3127 | "A bool indicating whether the memory is C contiguous."); |
| 3128 | PyDoc_STRVAR(memory_f_contiguous_doc, |
| 3129 | "A bool indicating whether the memory is Fortran contiguous."); |
| 3130 | PyDoc_STRVAR(memory_contiguous_doc, |
| 3131 | "A bool indicating whether the memory is contiguous."); |
Alexander Belopolsky | 397e5c9 | 2012-09-03 16:29:11 -0400 | [diff] [blame] | 3132 | |
Stefan Krah | bcaf599 | 2014-05-18 00:35:09 +0200 | [diff] [blame] | 3133 | |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 3134 | static PyGetSetDef memory_getsetlist[] = { |
Alexander Belopolsky | f73c69e | 2012-09-03 16:51:01 -0400 | [diff] [blame] | 3135 | {"obj", (getter)memory_obj_get, NULL, memory_obj_doc}, |
| 3136 | {"nbytes", (getter)memory_nbytes_get, NULL, memory_nbytes_doc}, |
Alexander Belopolsky | e370c38 | 2012-09-03 16:43:55 -0400 | [diff] [blame] | 3137 | {"readonly", (getter)memory_readonly_get, NULL, memory_readonly_doc}, |
| 3138 | {"itemsize", (getter)memory_itemsize_get, NULL, memory_itemsize_doc}, |
| 3139 | {"format", (getter)memory_format_get, NULL, memory_format_doc}, |
| 3140 | {"ndim", (getter)memory_ndim_get, NULL, memory_ndim_doc}, |
| 3141 | {"shape", (getter)memory_shape_get, NULL, memory_shape_doc}, |
| 3142 | {"strides", (getter)memory_strides_get, NULL, memory_strides_doc}, |
| 3143 | {"suboffsets", (getter)memory_suboffsets_get, NULL, memory_suboffsets_doc}, |
Alexander Belopolsky | f73c69e | 2012-09-03 16:51:01 -0400 | [diff] [blame] | 3144 | {"c_contiguous", (getter)memory_c_contiguous, NULL, memory_c_contiguous_doc}, |
| 3145 | {"f_contiguous", (getter)memory_f_contiguous, NULL, memory_f_contiguous_doc}, |
| 3146 | {"contiguous", (getter)memory_contiguous, NULL, memory_contiguous_doc}, |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 3147 | {NULL, NULL, NULL, NULL}, |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 3148 | }; |
| 3149 | |
| 3150 | |
Antoine Pitrou | 6e6cc83 | 2010-09-09 12:59:39 +0000 | [diff] [blame] | 3151 | static PyMethodDef memory_methods[] = { |
Serhiy Storchaka | 80a5036 | 2020-07-18 11:12:05 +0300 | [diff] [blame] | 3152 | MEMORYVIEW_RELEASE_METHODDEF |
| 3153 | MEMORYVIEW_TOBYTES_METHODDEF |
Gregory P. Smith | 0c2f930 | 2019-05-29 11:46:58 -0700 | [diff] [blame] | 3154 | MEMORYVIEW_HEX_METHODDEF |
Serhiy Storchaka | 80a5036 | 2020-07-18 11:12:05 +0300 | [diff] [blame] | 3155 | MEMORYVIEW_TOLIST_METHODDEF |
| 3156 | MEMORYVIEW_CAST_METHODDEF |
| 3157 | MEMORYVIEW_TOREADONLY_METHODDEF |
Stefan Krah | e4c0799 | 2012-07-28 14:10:02 +0200 | [diff] [blame] | 3158 | {"__enter__", memory_enter, METH_NOARGS, NULL}, |
| 3159 | {"__exit__", memory_exit, METH_VARARGS, NULL}, |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 3160 | {NULL, NULL} |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 3161 | }; |
| 3162 | |
dxflores | b0ac5d7 | 2020-09-08 08:28:45 +0100 | [diff] [blame] | 3163 | /**************************************************************************/ |
| 3164 | /* Memoryview Iterator */ |
| 3165 | /**************************************************************************/ |
| 3166 | |
| 3167 | static PyTypeObject PyMemoryIter_Type; |
| 3168 | |
| 3169 | typedef struct { |
| 3170 | PyObject_HEAD |
| 3171 | Py_ssize_t it_index; |
| 3172 | PyMemoryViewObject *it_seq; // Set to NULL when iterator is exhausted |
| 3173 | Py_ssize_t it_length; |
| 3174 | const char *it_fmt; |
| 3175 | } memoryiterobject; |
| 3176 | |
| 3177 | static void |
| 3178 | memoryiter_dealloc(memoryiterobject *it) |
| 3179 | { |
| 3180 | _PyObject_GC_UNTRACK(it); |
| 3181 | Py_XDECREF(it->it_seq); |
| 3182 | PyObject_GC_Del(it); |
| 3183 | } |
| 3184 | |
| 3185 | static int |
| 3186 | memoryiter_traverse(memoryiterobject *it, visitproc visit, void *arg) |
| 3187 | { |
| 3188 | Py_VISIT(it->it_seq); |
| 3189 | return 0; |
| 3190 | } |
| 3191 | |
| 3192 | static PyObject * |
| 3193 | memoryiter_next(memoryiterobject *it) |
| 3194 | { |
| 3195 | PyMemoryViewObject *seq; |
| 3196 | seq = it->it_seq; |
| 3197 | if (seq == NULL) { |
| 3198 | return NULL; |
| 3199 | } |
| 3200 | |
| 3201 | if (it->it_index < it->it_length) { |
| 3202 | CHECK_RELEASED(seq); |
| 3203 | Py_buffer *view = &(seq->view); |
| 3204 | char *ptr = (char *)seq->view.buf; |
| 3205 | |
| 3206 | ptr += view->strides[0] * it->it_index++; |
| 3207 | ptr = ADJUST_PTR(ptr, view->suboffsets, 0); |
| 3208 | if (ptr == NULL) { |
| 3209 | return NULL; |
| 3210 | } |
| 3211 | return unpack_single(ptr, it->it_fmt); |
| 3212 | } |
| 3213 | |
| 3214 | it->it_seq = NULL; |
| 3215 | Py_DECREF(seq); |
| 3216 | return NULL; |
| 3217 | } |
| 3218 | |
| 3219 | static PyObject * |
| 3220 | memory_iter(PyObject *seq) |
| 3221 | { |
| 3222 | if (!PyMemoryView_Check(seq)) { |
| 3223 | PyErr_BadInternalCall(); |
| 3224 | return NULL; |
| 3225 | } |
| 3226 | PyMemoryViewObject *obj = (PyMemoryViewObject *)seq; |
| 3227 | int ndims = obj->view.ndim; |
| 3228 | if (ndims == 0) { |
| 3229 | PyErr_SetString(PyExc_TypeError, "invalid indexing of 0-dim memory"); |
| 3230 | return NULL; |
| 3231 | } |
| 3232 | if (ndims != 1) { |
| 3233 | PyErr_SetString(PyExc_NotImplementedError, |
| 3234 | "multi-dimensional sub-views are not implemented"); |
| 3235 | return NULL; |
| 3236 | } |
| 3237 | |
| 3238 | const char *fmt = adjust_fmt(&obj->view); |
| 3239 | if (fmt == NULL) { |
| 3240 | return NULL; |
| 3241 | } |
| 3242 | |
| 3243 | memoryiterobject *it; |
| 3244 | it = PyObject_GC_New(memoryiterobject, &PyMemoryIter_Type); |
| 3245 | if (it == NULL) { |
| 3246 | return NULL; |
| 3247 | } |
| 3248 | it->it_fmt = fmt; |
| 3249 | it->it_length = memory_length(obj); |
| 3250 | it->it_index = 0; |
| 3251 | Py_INCREF(seq); |
| 3252 | it->it_seq = obj; |
| 3253 | _PyObject_GC_TRACK(it); |
| 3254 | return (PyObject *)it; |
| 3255 | } |
| 3256 | |
| 3257 | static PyTypeObject PyMemoryIter_Type = { |
| 3258 | PyVarObject_HEAD_INIT(&PyType_Type, 0) |
| 3259 | .tp_name = "memory_iterator", |
| 3260 | .tp_basicsize = sizeof(memoryiterobject), |
| 3261 | // methods |
| 3262 | .tp_dealloc = (destructor)memoryiter_dealloc, |
| 3263 | .tp_getattro = PyObject_GenericGetAttr, |
| 3264 | .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, |
| 3265 | .tp_traverse = (traverseproc)memoryiter_traverse, |
| 3266 | .tp_iter = PyObject_SelfIter, |
| 3267 | .tp_iternext = (iternextfunc)memoryiter_next, |
| 3268 | }; |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 3269 | |
| 3270 | PyTypeObject PyMemoryView_Type = { |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 3271 | PyVarObject_HEAD_INIT(&PyType_Type, 0) |
Stefan Krah | 9a2d99e | 2012-02-25 12:24:21 +0100 | [diff] [blame] | 3272 | "memoryview", /* tp_name */ |
| 3273 | offsetof(PyMemoryViewObject, ob_array), /* tp_basicsize */ |
| 3274 | sizeof(Py_ssize_t), /* tp_itemsize */ |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 3275 | (destructor)memory_dealloc, /* tp_dealloc */ |
Jeroen Demeyer | 530f506 | 2019-05-31 04:13:39 +0200 | [diff] [blame] | 3276 | 0, /* tp_vectorcall_offset */ |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 3277 | 0, /* tp_getattr */ |
| 3278 | 0, /* tp_setattr */ |
Jeroen Demeyer | 530f506 | 2019-05-31 04:13:39 +0200 | [diff] [blame] | 3279 | 0, /* tp_as_async */ |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 3280 | (reprfunc)memory_repr, /* tp_repr */ |
| 3281 | 0, /* tp_as_number */ |
Raymond Hettinger | 159eac9 | 2009-06-23 20:38:54 +0000 | [diff] [blame] | 3282 | &memory_as_sequence, /* tp_as_sequence */ |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 3283 | &memory_as_mapping, /* tp_as_mapping */ |
Antoine Pitrou | ce4a9da | 2011-11-21 20:46:33 +0100 | [diff] [blame] | 3284 | (hashfunc)memory_hash, /* tp_hash */ |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 3285 | 0, /* tp_call */ |
Benjamin Peterson | 8761855 | 2009-02-08 15:00:52 +0000 | [diff] [blame] | 3286 | 0, /* tp_str */ |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 3287 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 3288 | 0, /* tp_setattro */ |
| 3289 | &memory_as_buffer, /* tp_as_buffer */ |
| 3290 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */ |
Serhiy Storchaka | 80a5036 | 2020-07-18 11:12:05 +0300 | [diff] [blame] | 3291 | memoryview__doc__, /* tp_doc */ |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 3292 | (traverseproc)memory_traverse, /* tp_traverse */ |
| 3293 | (inquiry)memory_clear, /* tp_clear */ |
| 3294 | memory_richcompare, /* tp_richcompare */ |
Richard Oudkerk | 3e0a1eb | 2012-05-28 21:35:09 +0100 | [diff] [blame] | 3295 | offsetof(PyMemoryViewObject, weakreflist),/* tp_weaklistoffset */ |
dxflores | b0ac5d7 | 2020-09-08 08:28:45 +0100 | [diff] [blame] | 3296 | memory_iter, /* tp_iter */ |
Antoine Pitrou | 35b7e83 | 2009-01-03 19:20:36 +0000 | [diff] [blame] | 3297 | 0, /* tp_iternext */ |
| 3298 | memory_methods, /* tp_methods */ |
| 3299 | 0, /* tp_members */ |
| 3300 | memory_getsetlist, /* tp_getset */ |
| 3301 | 0, /* tp_base */ |
| 3302 | 0, /* tp_dict */ |
| 3303 | 0, /* tp_descr_get */ |
| 3304 | 0, /* tp_descr_set */ |
| 3305 | 0, /* tp_dictoffset */ |
| 3306 | 0, /* tp_init */ |
| 3307 | 0, /* tp_alloc */ |
Serhiy Storchaka | 80a5036 | 2020-07-18 11:12:05 +0300 | [diff] [blame] | 3308 | memoryview, /* tp_new */ |
Travis E. Oliphant | b99f762 | 2007-08-18 11:21:56 +0000 | [diff] [blame] | 3309 | }; |