Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 1 | /* |
| 2 | / Author: Sam Rushing <rushing@nightmare.com> |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 3 | / Hacked for Unix by A.M. Kuchling <amk1@bigfoot.com> |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 4 | / $Id$ |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 5 | |
| 6 | / mmapmodule.cpp -- map a view of a file into memory |
| 7 | / |
| 8 | / todo: need permission flags, perhaps a 'chsize' analog |
| 9 | / not all functions check range yet!!! |
| 10 | / |
| 11 | / |
| 12 | / Note: This module currently only deals with 32-bit file |
| 13 | / sizes. |
| 14 | / |
| 15 | / The latest version of mmapfile is maintained by Sam at |
| 16 | / ftp://squirl.nightmare.com/pub/python/python-ext. |
| 17 | */ |
| 18 | |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 19 | #include <Python.h> |
| 20 | |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 21 | #ifndef MS_WIN32 |
| 22 | #define UNIX |
| 23 | #endif |
| 24 | |
| 25 | #ifdef MS_WIN32 |
| 26 | #include <windows.h> |
| 27 | #endif |
| 28 | |
| 29 | #ifdef UNIX |
| 30 | #include <unistd.h> |
| 31 | #include <sys/mman.h> |
Andrew M. Kuchling | 7b9fb92 | 2000-06-17 22:41:22 +0000 | [diff] [blame] | 32 | #include <sys/stat.h> |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 33 | #endif |
| 34 | |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 35 | #include <string.h> |
| 36 | #include <sys/types.h> |
| 37 | |
| 38 | static PyObject *mmap_module_error; |
| 39 | |
| 40 | typedef struct { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 41 | PyObject_HEAD |
| 42 | char * data; |
| 43 | size_t size; |
| 44 | size_t pos; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 45 | |
| 46 | #ifdef MS_WIN32 |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 47 | HANDLE map_handle; |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 48 | INT_PTR file_handle; |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 49 | char * tagname; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 50 | #endif |
| 51 | |
| 52 | #ifdef UNIX |
Andrew M. Kuchling | 7b9fb92 | 2000-06-17 22:41:22 +0000 | [diff] [blame] | 53 | int fd; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 54 | #endif |
| 55 | } mmap_object; |
| 56 | |
| 57 | static void |
| 58 | mmap_object_dealloc(mmap_object * m_obj) |
| 59 | { |
| 60 | #ifdef MS_WIN32 |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 61 | UnmapViewOfFile (m_obj->data); |
| 62 | CloseHandle (m_obj->map_handle); |
| 63 | CloseHandle ((HANDLE)m_obj->file_handle); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 64 | #endif /* MS_WIN32 */ |
| 65 | |
| 66 | #ifdef UNIX |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 67 | if (m_obj->data!=NULL) { |
Andrew M. Kuchling | 9bc5f33 | 2000-06-18 04:25:08 +0000 | [diff] [blame] | 68 | msync(m_obj->data, m_obj->size, MS_SYNC); |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 69 | munmap(m_obj->data, m_obj->size); |
| 70 | } |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 71 | #endif /* UNIX */ |
| 72 | |
Guido van Rossum | b18618d | 2000-05-03 23:44:39 +0000 | [diff] [blame] | 73 | PyObject_Del(m_obj); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 74 | } |
| 75 | |
| 76 | static PyObject * |
| 77 | mmap_close_method (mmap_object * self, PyObject * args) |
| 78 | { |
Andrew M. Kuchling | 841b9fb | 2000-06-03 20:43:43 +0000 | [diff] [blame] | 79 | if (!PyArg_ParseTuple(args, ":close")) |
Andrew M. Kuchling | 961fe17 | 2000-06-03 19:41:42 +0000 | [diff] [blame] | 80 | return NULL; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 81 | #ifdef MS_WIN32 |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 82 | UnmapViewOfFile (self->data); |
| 83 | CloseHandle (self->map_handle); |
| 84 | CloseHandle ((HANDLE)self->file_handle); |
| 85 | self->map_handle = (HANDLE) NULL; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 86 | #endif /* MS_WIN32 */ |
| 87 | |
| 88 | #ifdef UNIX |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 89 | munmap(self->data, self->size); |
| 90 | self->data = NULL; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 91 | #endif |
| 92 | |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 93 | Py_INCREF (Py_None); |
| 94 | return (Py_None); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 95 | } |
| 96 | |
| 97 | #ifdef MS_WIN32 |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 98 | #define CHECK_VALID(err) \ |
| 99 | do { \ |
| 100 | if (!self->map_handle) { \ |
| 101 | PyErr_SetString (PyExc_ValueError, "mmap closed or invalid"); \ |
| 102 | return err; \ |
| 103 | } \ |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 104 | } while (0) |
| 105 | #endif /* MS_WIN32 */ |
| 106 | |
| 107 | #ifdef UNIX |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 108 | #define CHECK_VALID(err) \ |
| 109 | do { \ |
| 110 | if (self->data == NULL) { \ |
| 111 | PyErr_SetString (PyExc_ValueError, "mmap closed or invalid"); \ |
| 112 | return err; \ |
| 113 | } \ |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 114 | } while (0) |
| 115 | #endif /* UNIX */ |
| 116 | |
| 117 | static PyObject * |
| 118 | mmap_read_byte_method (mmap_object * self, |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 119 | PyObject * args) |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 120 | { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 121 | char value; |
Guido van Rossum | 36d4f8b | 2000-04-10 21:34:37 +0000 | [diff] [blame] | 122 | char * where; |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 123 | CHECK_VALID(NULL); |
Andrew M. Kuchling | 841b9fb | 2000-06-03 20:43:43 +0000 | [diff] [blame] | 124 | if (!PyArg_ParseTuple(args, ":read_byte")) |
Andrew M. Kuchling | 961fe17 | 2000-06-03 19:41:42 +0000 | [diff] [blame] | 125 | return NULL; |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 126 | if (self->pos < self->size) { |
Guido van Rossum | 36d4f8b | 2000-04-10 21:34:37 +0000 | [diff] [blame] | 127 | where = self->data + self->pos; |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 128 | value = (char) *(where); |
| 129 | self->pos += 1; |
| 130 | return Py_BuildValue("c", (char) *(where)); |
| 131 | } else { |
| 132 | PyErr_SetString (PyExc_ValueError, "read byte out of range"); |
| 133 | return NULL; |
| 134 | } |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 135 | } |
| 136 | |
| 137 | static PyObject * |
| 138 | mmap_read_line_method (mmap_object * self, |
Andrew M. Kuchling | 961fe17 | 2000-06-03 19:41:42 +0000 | [diff] [blame] | 139 | PyObject * args) |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 140 | { |
Fred Drake | 56a87a0 | 2000-04-04 18:17:35 +0000 | [diff] [blame] | 141 | char * start = self->data+self->pos; |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 142 | char * eof = self->data+self->size; |
| 143 | char * eol; |
| 144 | PyObject * result; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 145 | |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 146 | CHECK_VALID(NULL); |
Andrew M. Kuchling | 841b9fb | 2000-06-03 20:43:43 +0000 | [diff] [blame] | 147 | if (!PyArg_ParseTuple(args, ":readline")) |
Andrew M. Kuchling | 961fe17 | 2000-06-03 19:41:42 +0000 | [diff] [blame] | 148 | return NULL; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 149 | |
Fred Drake | 56a87a0 | 2000-04-04 18:17:35 +0000 | [diff] [blame] | 150 | eol = memchr(start, '\n', self->size - self->pos); |
| 151 | if (!eol) |
| 152 | eol = eof; |
| 153 | else |
| 154 | ++eol; /* we're interested in the position after the |
| 155 | newline. */ |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 156 | result = PyString_FromStringAndSize(start, (eol - start)); |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 157 | self->pos += (eol - start); |
| 158 | return (result); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 159 | } |
| 160 | |
| 161 | static PyObject * |
| 162 | mmap_read_method (mmap_object * self, |
Andrew M. Kuchling | 961fe17 | 2000-06-03 19:41:42 +0000 | [diff] [blame] | 163 | PyObject * args) |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 164 | { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 165 | long num_bytes; |
| 166 | PyObject *result; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 167 | |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 168 | CHECK_VALID(NULL); |
| 169 | if (!PyArg_ParseTuple (args, "l", &num_bytes)) |
| 170 | return(NULL); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 171 | |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 172 | /* silently 'adjust' out-of-range requests */ |
| 173 | if ((self->pos + num_bytes) > self->size) { |
| 174 | num_bytes -= (self->pos+num_bytes) - self->size; |
| 175 | } |
| 176 | result = Py_BuildValue("s#", self->data+self->pos, num_bytes); |
| 177 | self->pos += num_bytes; |
| 178 | return (result); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 179 | } |
| 180 | |
| 181 | static PyObject * |
| 182 | mmap_find_method (mmap_object *self, |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 183 | PyObject *args) |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 184 | { |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 185 | int start = self->pos; |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 186 | char * needle; |
| 187 | int len; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 188 | |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 189 | CHECK_VALID(NULL); |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 190 | if (!PyArg_ParseTuple (args, "s#|i", &needle, &len, &start)) { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 191 | return NULL; |
| 192 | } else { |
| 193 | char * p = self->data+self->pos; |
| 194 | char * e = self->data+self->size; |
| 195 | while (p < e) { |
| 196 | char * s = p; |
| 197 | char * n = needle; |
| 198 | while ((s<e) && (*n) && !(*s-*n)) { |
| 199 | s++, n++; |
| 200 | } |
| 201 | if (!*n) { |
| 202 | return Py_BuildValue ( |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 203 | "i", |
| 204 | (int) (p - (self->data + start))); |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 205 | } |
| 206 | p++; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 207 | } |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 208 | return Py_BuildValue ("l", (long) -1); |
| 209 | } |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 210 | } |
| 211 | |
| 212 | static PyObject * |
| 213 | mmap_write_method (mmap_object * self, |
Andrew M. Kuchling | 7b9fb92 | 2000-06-17 22:41:22 +0000 | [diff] [blame] | 214 | PyObject * args) |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 215 | { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 216 | long length; |
| 217 | char * data; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 218 | |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 219 | CHECK_VALID(NULL); |
| 220 | if (!PyArg_ParseTuple (args, "s#", &data, &length)) |
| 221 | return(NULL); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 222 | |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 223 | if ((self->pos + length) > self->size) { |
| 224 | PyErr_SetString (PyExc_ValueError, "data out of range"); |
| 225 | return NULL; |
| 226 | } |
| 227 | memcpy (self->data+self->pos, data, length); |
| 228 | self->pos = self->pos+length; |
| 229 | Py_INCREF (Py_None); |
| 230 | return (Py_None); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 231 | } |
| 232 | |
| 233 | static PyObject * |
| 234 | mmap_write_byte_method (mmap_object * self, |
Andrew M. Kuchling | 961fe17 | 2000-06-03 19:41:42 +0000 | [diff] [blame] | 235 | PyObject * args) |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 236 | { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 237 | char value; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 238 | |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 239 | CHECK_VALID(NULL); |
| 240 | if (!PyArg_ParseTuple (args, "c", &value)) |
| 241 | return(NULL); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 242 | |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 243 | *(self->data+self->pos) = value; |
| 244 | self->pos += 1; |
| 245 | Py_INCREF (Py_None); |
| 246 | return (Py_None); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 247 | } |
| 248 | |
| 249 | static PyObject * |
| 250 | mmap_size_method (mmap_object * self, |
Andrew M. Kuchling | 961fe17 | 2000-06-03 19:41:42 +0000 | [diff] [blame] | 251 | PyObject * args) |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 252 | { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 253 | CHECK_VALID(NULL); |
Andrew M. Kuchling | 841b9fb | 2000-06-03 20:43:43 +0000 | [diff] [blame] | 254 | if (!PyArg_ParseTuple(args, ":size")) |
Andrew M. Kuchling | 961fe17 | 2000-06-03 19:41:42 +0000 | [diff] [blame] | 255 | return NULL; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 256 | |
| 257 | #ifdef MS_WIN32 |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 258 | if (self->file_handle != (INT_PTR) -1) { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 259 | return (Py_BuildValue ( |
| 260 | "l", |
| 261 | GetFileSize ((HANDLE)self->file_handle, NULL))); |
| 262 | } else { |
| 263 | return (Py_BuildValue ("l", self->size) ); |
| 264 | } |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 265 | #endif /* MS_WIN32 */ |
| 266 | |
| 267 | #ifdef UNIX |
Andrew M. Kuchling | 7b9fb92 | 2000-06-17 22:41:22 +0000 | [diff] [blame] | 268 | { |
| 269 | struct stat buf; |
| 270 | if (-1 == fstat(self->fd, &buf)) { |
| 271 | PyErr_SetFromErrno(mmap_module_error); |
| 272 | return NULL; |
| 273 | } |
| 274 | return (Py_BuildValue ("l", buf.st_size) ); |
| 275 | } |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 276 | #endif /* UNIX */ |
| 277 | } |
| 278 | |
| 279 | /* This assumes that you want the entire file mapped, |
| 280 | / and when recreating the map will make the new file |
| 281 | / have the new size |
| 282 | / |
| 283 | / Is this really necessary? This could easily be done |
| 284 | / from python by just closing and re-opening with the |
| 285 | / new size? |
| 286 | */ |
| 287 | |
| 288 | static PyObject * |
| 289 | mmap_resize_method (mmap_object * self, |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 290 | PyObject * args) |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 291 | { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 292 | unsigned long new_size; |
| 293 | CHECK_VALID(NULL); |
| 294 | if (!PyArg_ParseTuple (args, "l", &new_size)) { |
| 295 | return NULL; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 296 | #ifdef MS_WIN32 |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 297 | } else { |
| 298 | DWORD dwErrCode = 0; |
| 299 | /* First, unmap the file view */ |
| 300 | UnmapViewOfFile (self->data); |
| 301 | /* Close the mapping object */ |
| 302 | CloseHandle ((HANDLE)self->map_handle); |
| 303 | /* Move to the desired EOF position */ |
| 304 | SetFilePointer ((HANDLE)self->file_handle, |
| 305 | new_size, NULL, FILE_BEGIN); |
| 306 | /* Change the size of the file */ |
| 307 | SetEndOfFile ((HANDLE)self->file_handle); |
| 308 | /* Create another mapping object and remap the file view */ |
| 309 | self->map_handle = CreateFileMapping ( |
| 310 | (HANDLE) self->file_handle, |
| 311 | NULL, |
| 312 | PAGE_READWRITE, |
| 313 | 0, |
| 314 | new_size, |
| 315 | self->tagname); |
| 316 | if (self->map_handle != NULL) { |
| 317 | self->data = (char *) MapViewOfFile (self->map_handle, |
| 318 | FILE_MAP_WRITE, |
| 319 | 0, |
| 320 | 0, |
| 321 | 0); |
| 322 | if (self->data != NULL) { |
| 323 | self->size = new_size; |
| 324 | Py_INCREF (Py_None); |
| 325 | return Py_None; |
| 326 | } else { |
| 327 | dwErrCode = GetLastError(); |
| 328 | } |
| 329 | } else { |
| 330 | dwErrCode = GetLastError(); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 331 | } |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 332 | PyErr_SetFromWindowsErr(dwErrCode); |
| 333 | return (NULL); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 334 | #endif /* MS_WIN32 */ |
| 335 | |
| 336 | #ifdef UNIX |
| 337 | #ifndef MREMAP_MAYMOVE |
| 338 | } else { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 339 | PyErr_SetString(PyExc_SystemError, |
| 340 | "mmap: resizing not available--no mremap()"); |
| 341 | return NULL; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 342 | #else |
| 343 | } else { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 344 | void *newmap; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 345 | |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 346 | newmap = mremap(self->data, self->size, new_size, MREMAP_MAYMOVE); |
| 347 | if (newmap == (void *)-1) |
| 348 | { |
| 349 | PyErr_SetFromErrno(mmap_module_error); |
| 350 | return NULL; |
| 351 | } |
| 352 | self->data = newmap; |
| 353 | self->size = new_size; |
| 354 | Py_INCREF(Py_None); |
| 355 | return Py_None; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 356 | #endif /* MREMAP_MAYMOVE */ |
| 357 | #endif /* UNIX */ |
| 358 | } |
| 359 | } |
| 360 | |
| 361 | static PyObject * |
| 362 | mmap_tell_method (mmap_object * self, PyObject * args) |
| 363 | { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 364 | CHECK_VALID(NULL); |
Andrew M. Kuchling | 841b9fb | 2000-06-03 20:43:43 +0000 | [diff] [blame] | 365 | if (!PyArg_ParseTuple(args, ":tell")) |
Andrew M. Kuchling | 961fe17 | 2000-06-03 19:41:42 +0000 | [diff] [blame] | 366 | return NULL; |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 367 | return (Py_BuildValue ("l", self->pos) ); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 368 | } |
| 369 | |
| 370 | static PyObject * |
| 371 | mmap_flush_method (mmap_object * self, PyObject * args) |
| 372 | { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 373 | size_t offset = 0; |
| 374 | size_t size = self->size; |
| 375 | CHECK_VALID(NULL); |
| 376 | if (!PyArg_ParseTuple (args, "|ll", &offset, &size)) { |
| 377 | return NULL; |
| 378 | } else if ((offset + size) > self->size) { |
| 379 | PyErr_SetString (PyExc_ValueError, |
| 380 | "flush values out of range"); |
| 381 | return NULL; |
| 382 | } else { |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 383 | #ifdef MS_WIN32 |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 384 | return (Py_BuildValue ( |
| 385 | "l", FlushViewOfFile (self->data+offset, size))); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 386 | #endif /* MS_WIN32 */ |
| 387 | #ifdef UNIX |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 388 | /* XXX semantics of return value? */ |
| 389 | /* XXX flags for msync? */ |
| 390 | if (-1 == msync(self->data + offset, size, |
Andrew M. Kuchling | 9bc5f33 | 2000-06-18 04:25:08 +0000 | [diff] [blame] | 391 | MS_SYNC)) |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 392 | { |
| 393 | PyErr_SetFromErrno(mmap_module_error); |
| 394 | return NULL; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 395 | } |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 396 | return Py_BuildValue ("l", 0); |
| 397 | #endif /* UNIX */ |
| 398 | } |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 399 | } |
| 400 | |
| 401 | static PyObject * |
| 402 | mmap_seek_method (mmap_object * self, PyObject * args) |
| 403 | { |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 404 | int dist; |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 405 | int how=0; |
| 406 | CHECK_VALID(NULL); |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 407 | if (!PyArg_ParseTuple (args, "i|i", &dist, &how)) { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 408 | return(NULL); |
| 409 | } else { |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 410 | size_t where; |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 411 | switch (how) { |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 412 | case 0: /* relative to start */ |
| 413 | if (dist < 0) |
| 414 | goto onoutofrange; |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 415 | where = dist; |
| 416 | break; |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 417 | case 1: /* relative to current position */ |
| 418 | if ((int)self->pos + dist < 0) |
| 419 | goto onoutofrange; |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 420 | where = self->pos + dist; |
| 421 | break; |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 422 | case 2: /* relative to end */ |
| 423 | if ((int)self->size + dist < 0) |
| 424 | goto onoutofrange; |
| 425 | where = self->size + dist; |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 426 | break; |
| 427 | default: |
| 428 | PyErr_SetString (PyExc_ValueError, |
| 429 | "unknown seek type"); |
| 430 | return NULL; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 431 | } |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 432 | if (where > self->size) |
| 433 | goto onoutofrange; |
| 434 | self->pos = where; |
| 435 | Py_INCREF (Py_None); |
| 436 | return (Py_None); |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 437 | } |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 438 | |
| 439 | onoutofrange: |
| 440 | PyErr_SetString (PyExc_ValueError, "seek out of range"); |
| 441 | return NULL; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 442 | } |
| 443 | |
| 444 | static PyObject * |
| 445 | mmap_move_method (mmap_object * self, PyObject * args) |
| 446 | { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 447 | unsigned long dest, src, count; |
| 448 | CHECK_VALID(NULL); |
| 449 | if (!PyArg_ParseTuple (args, "iii", &dest, &src, &count)) { |
| 450 | return NULL; |
| 451 | } else { |
| 452 | /* bounds check the values */ |
| 453 | if (/* end of source after end of data?? */ |
| 454 | ((src+count) > self->size) |
| 455 | /* dest will fit? */ |
| 456 | || (dest+count > self->size)) { |
| 457 | PyErr_SetString (PyExc_ValueError, |
| 458 | "source or destination out of range"); |
| 459 | return NULL; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 460 | } else { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 461 | memmove (self->data+dest, self->data+src, count); |
| 462 | Py_INCREF (Py_None); |
| 463 | return Py_None; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 464 | } |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 465 | } |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 466 | } |
| 467 | |
| 468 | static struct PyMethodDef mmap_object_methods[] = { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 469 | {"close", (PyCFunction) mmap_close_method, 1}, |
| 470 | {"find", (PyCFunction) mmap_find_method, 1}, |
| 471 | {"flush", (PyCFunction) mmap_flush_method, 1}, |
| 472 | {"move", (PyCFunction) mmap_move_method, 1}, |
| 473 | {"read", (PyCFunction) mmap_read_method, 1}, |
| 474 | {"read_byte", (PyCFunction) mmap_read_byte_method, 1}, |
| 475 | {"readline", (PyCFunction) mmap_read_line_method, 1}, |
| 476 | {"resize", (PyCFunction) mmap_resize_method, 1}, |
| 477 | {"seek", (PyCFunction) mmap_seek_method, 1}, |
| 478 | {"size", (PyCFunction) mmap_size_method, 1}, |
| 479 | {"tell", (PyCFunction) mmap_tell_method, 1}, |
| 480 | {"write", (PyCFunction) mmap_write_method, 1}, |
| 481 | {"write_byte", (PyCFunction) mmap_write_byte_method, 1}, |
| 482 | {NULL, NULL} /* sentinel */ |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 483 | }; |
| 484 | |
| 485 | /* Functions for treating an mmap'ed file as a buffer */ |
| 486 | |
| 487 | static int |
Andrew M. Kuchling | 961fe17 | 2000-06-03 19:41:42 +0000 | [diff] [blame] | 488 | mmap_buffer_getreadbuf(mmap_object *self, int index, const void **ptr) |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 489 | { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 490 | CHECK_VALID(-1); |
| 491 | if ( index != 0 ) { |
| 492 | PyErr_SetString(PyExc_SystemError, |
| 493 | "Accessing non-existent mmap segment"); |
| 494 | return -1; |
| 495 | } |
| 496 | *ptr = self->data; |
| 497 | return self->size; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 498 | } |
| 499 | |
| 500 | static int |
| 501 | mmap_buffer_getwritebuf(self, index, ptr) |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 502 | mmap_object *self; |
| 503 | int index; |
| 504 | const void **ptr; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 505 | { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 506 | CHECK_VALID(-1); |
| 507 | if ( index != 0 ) { |
| 508 | PyErr_SetString(PyExc_SystemError, |
| 509 | "Accessing non-existent mmap segment"); |
| 510 | return -1; |
| 511 | } |
| 512 | *ptr = self->data; |
| 513 | return self->size; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 514 | } |
| 515 | |
| 516 | static int |
| 517 | mmap_buffer_getsegcount(self, lenp) |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 518 | mmap_object *self; |
| 519 | int *lenp; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 520 | { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 521 | CHECK_VALID(-1); |
| 522 | if (lenp) |
| 523 | *lenp = self->size; |
| 524 | return 1; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 525 | } |
| 526 | |
| 527 | static int |
| 528 | mmap_buffer_getcharbuffer(self, index, ptr) |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 529 | mmap_object *self; |
| 530 | int index; |
| 531 | const void **ptr; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 532 | { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 533 | if ( index != 0 ) { |
| 534 | PyErr_SetString(PyExc_SystemError, |
| 535 | "accessing non-existent buffer segment"); |
| 536 | return -1; |
| 537 | } |
| 538 | *ptr = (const char *)self->data; |
| 539 | return self->size; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 540 | } |
| 541 | |
| 542 | static PyObject * |
| 543 | mmap_object_getattr(mmap_object * self, char * name) |
| 544 | { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 545 | return Py_FindMethod (mmap_object_methods, (PyObject *)self, name); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 546 | } |
| 547 | |
| 548 | static int |
| 549 | mmap_length(self) |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 550 | mmap_object *self; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 551 | { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 552 | CHECK_VALID(-1); |
| 553 | return self->size; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 554 | } |
| 555 | |
| 556 | static PyObject * |
| 557 | mmap_item(self, i) |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 558 | mmap_object *self; |
| 559 | int i; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 560 | { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 561 | CHECK_VALID(NULL); |
| 562 | if (i < 0 || i >= self->size) { |
| 563 | PyErr_SetString(PyExc_IndexError, "mmap index out of range"); |
| 564 | return NULL; |
| 565 | } |
| 566 | return PyString_FromStringAndSize(self->data + i, 1); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 567 | } |
| 568 | |
| 569 | static PyObject * |
| 570 | mmap_slice(self, ilow, ihigh) |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 571 | mmap_object *self; |
| 572 | int ilow, ihigh; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 573 | { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 574 | CHECK_VALID(NULL); |
| 575 | if (ilow < 0) |
| 576 | ilow = 0; |
| 577 | else if (ilow > self->size) |
| 578 | ilow = self->size; |
| 579 | if (ihigh < 0) |
| 580 | ihigh = 0; |
| 581 | if (ihigh < ilow) |
| 582 | ihigh = ilow; |
| 583 | else if (ihigh > self->size) |
| 584 | ihigh = self->size; |
| 585 | |
| 586 | return PyString_FromStringAndSize(self->data + ilow, ihigh-ilow); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 587 | } |
| 588 | |
| 589 | static PyObject * |
| 590 | mmap_concat(self, bb) |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 591 | mmap_object *self; |
| 592 | PyObject *bb; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 593 | { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 594 | CHECK_VALID(NULL); |
| 595 | PyErr_SetString(PyExc_SystemError, |
| 596 | "mmaps don't support concatenation"); |
| 597 | return NULL; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 598 | } |
| 599 | |
| 600 | static PyObject * |
| 601 | mmap_repeat(self, n) |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 602 | mmap_object *self; |
| 603 | int n; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 604 | { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 605 | CHECK_VALID(NULL); |
| 606 | PyErr_SetString(PyExc_SystemError, |
| 607 | "mmaps don't support repeat operation"); |
| 608 | return NULL; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 609 | } |
| 610 | |
| 611 | static int |
| 612 | mmap_ass_slice(self, ilow, ihigh, v) |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 613 | mmap_object *self; |
| 614 | int ilow, ihigh; |
| 615 | PyObject *v; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 616 | { |
Guido van Rossum | 36d4f8b | 2000-04-10 21:34:37 +0000 | [diff] [blame] | 617 | const char *buf; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 618 | |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 619 | CHECK_VALID(-1); |
| 620 | if (ilow < 0) |
| 621 | ilow = 0; |
| 622 | else if (ilow > self->size) |
| 623 | ilow = self->size; |
| 624 | if (ihigh < 0) |
| 625 | ihigh = 0; |
| 626 | if (ihigh < ilow) |
| 627 | ihigh = ilow; |
| 628 | else if (ihigh > self->size) |
| 629 | ihigh = self->size; |
| 630 | |
| 631 | if (! (PyString_Check(v)) ) { |
| 632 | PyErr_SetString(PyExc_IndexError, |
| 633 | "mmap slice assignment must be a string"); |
| 634 | return -1; |
| 635 | } |
| 636 | if ( PyString_Size(v) != (ihigh - ilow) ) { |
| 637 | PyErr_SetString(PyExc_IndexError, |
| 638 | "mmap slice assignment is wrong size"); |
| 639 | return -1; |
| 640 | } |
| 641 | buf = PyString_AsString(v); |
| 642 | memcpy(self->data + ilow, buf, ihigh-ilow); |
| 643 | return 0; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 644 | } |
| 645 | |
| 646 | static int |
| 647 | mmap_ass_item(self, i, v) |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 648 | mmap_object *self; |
| 649 | int i; |
| 650 | PyObject *v; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 651 | { |
Guido van Rossum | 36d4f8b | 2000-04-10 21:34:37 +0000 | [diff] [blame] | 652 | const char *buf; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 653 | |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 654 | CHECK_VALID(-1); |
| 655 | if (i < 0 || i >= self->size) { |
| 656 | PyErr_SetString(PyExc_IndexError, "mmap index out of range"); |
| 657 | return -1; |
| 658 | } |
| 659 | if (! (PyString_Check(v) && PyString_Size(v)==1) ) { |
| 660 | PyErr_SetString(PyExc_IndexError, |
| 661 | "mmap assignment must be single-character string"); |
| 662 | return -1; |
| 663 | } |
| 664 | buf = PyString_AsString(v); |
| 665 | self->data[i] = buf[0]; |
| 666 | return 0; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 667 | } |
| 668 | |
| 669 | static PySequenceMethods mmap_as_sequence = { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 670 | (inquiry)mmap_length, /*sq_length*/ |
| 671 | (binaryfunc)mmap_concat, /*sq_concat*/ |
| 672 | (intargfunc)mmap_repeat, /*sq_repeat*/ |
| 673 | (intargfunc)mmap_item, /*sq_item*/ |
| 674 | (intintargfunc)mmap_slice, /*sq_slice*/ |
| 675 | (intobjargproc)mmap_ass_item, /*sq_ass_item*/ |
| 676 | (intintobjargproc)mmap_ass_slice, /*sq_ass_slice*/ |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 677 | }; |
| 678 | |
| 679 | static PyBufferProcs mmap_as_buffer = { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 680 | (getreadbufferproc)mmap_buffer_getreadbuf, |
| 681 | (getwritebufferproc)mmap_buffer_getwritebuf, |
| 682 | (getsegcountproc)mmap_buffer_getsegcount, |
| 683 | (getcharbufferproc)mmap_buffer_getcharbuffer, |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 684 | }; |
| 685 | |
| 686 | static PyTypeObject mmap_object_type = { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 687 | PyObject_HEAD_INIT(0) /* patched in module init */ |
| 688 | 0, /* ob_size */ |
| 689 | "mmap", /* tp_name */ |
| 690 | sizeof(mmap_object), /* tp_size */ |
| 691 | 0, /* tp_itemsize */ |
| 692 | /* methods */ |
| 693 | (destructor) mmap_object_dealloc, /* tp_dealloc */ |
| 694 | 0, /* tp_print */ |
| 695 | (getattrfunc) mmap_object_getattr, /* tp_getattr */ |
| 696 | 0, /* tp_setattr */ |
| 697 | 0, /* tp_compare */ |
| 698 | 0, /* tp_repr */ |
| 699 | 0, /* tp_as_number */ |
| 700 | &mmap_as_sequence, /*tp_as_sequence*/ |
| 701 | 0, /*tp_as_mapping*/ |
| 702 | 0, /*tp_hash*/ |
| 703 | 0, /*tp_call*/ |
| 704 | 0, /*tp_str*/ |
| 705 | 0, /*tp_getattro*/ |
| 706 | 0, /*tp_setattro*/ |
| 707 | &mmap_as_buffer, /*tp_as_buffer*/ |
| 708 | Py_TPFLAGS_HAVE_GETCHARBUFFER, /*tp_flags*/ |
| 709 | 0, /*tp_doc*/ |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 710 | }; |
| 711 | |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 712 | |
| 713 | /* extract the map size from the given PyObject |
| 714 | |
| 715 | The map size is restricted to [0, INT_MAX] because this is the current |
| 716 | Python limitation on object sizes. Although the mmap object *could* handle |
| 717 | a larger map size, there is no point because all the useful operations |
| 718 | (len(), slicing(), sequence indexing) are limited by a C int. |
| 719 | |
| 720 | Returns -1 on error, with an apprpriate Python exception raised. On |
| 721 | success, the map size is returned. */ |
| 722 | static int |
| 723 | _GetMapSize(o) |
| 724 | PyObject *o; |
| 725 | { |
| 726 | if (PyInt_Check(o)) { |
| 727 | long i = PyInt_AsLong(o); |
| 728 | if (PyErr_Occurred()) |
| 729 | return -1; |
| 730 | if (i < 0) |
| 731 | goto onnegoverflow; |
| 732 | if (i > INT_MAX) |
| 733 | goto onposoverflow; |
| 734 | return (int)i; |
| 735 | } |
| 736 | else if (PyLong_Check(o)) { |
| 737 | long i = PyLong_AsLong(o); |
| 738 | if (PyErr_Occurred()) { |
| 739 | /* yes negative overflow is mistaken for positive overflow |
| 740 | but not worth the trouble to check sign of 'i' */ |
| 741 | if (PyErr_ExceptionMatches(PyExc_OverflowError)) |
| 742 | goto onposoverflow; |
| 743 | else |
| 744 | return -1; |
| 745 | } |
| 746 | if (i < 0) |
| 747 | goto onnegoverflow; |
| 748 | if (i > INT_MAX) |
| 749 | goto onposoverflow; |
| 750 | return (int)i; |
| 751 | } |
| 752 | else { |
| 753 | PyErr_SetString(PyExc_TypeError, |
| 754 | "map size must be an integral value"); |
| 755 | return -1; |
| 756 | } |
| 757 | |
| 758 | onnegoverflow: |
| 759 | PyErr_SetString(PyExc_OverflowError, |
| 760 | "memory mapped size must be positive"); |
| 761 | return -1; |
| 762 | |
| 763 | onposoverflow: |
| 764 | PyErr_SetString(PyExc_OverflowError, |
| 765 | "memory mapped size is too large (limited by C int)"); |
| 766 | return -1; |
| 767 | } |
| 768 | |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 769 | #ifdef UNIX |
| 770 | static PyObject * |
| 771 | new_mmap_object (PyObject * self, PyObject * args, PyObject *kwdict) |
| 772 | { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 773 | mmap_object * m_obj; |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 774 | PyObject *map_size_obj = NULL; |
| 775 | int map_size; |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 776 | int fd, flags = MAP_SHARED, prot = PROT_WRITE | PROT_READ; |
| 777 | char * filename; |
| 778 | int namelen; |
| 779 | char *keywords[] = {"file", "size", "flags", "prot", NULL}; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 780 | |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 781 | if (!PyArg_ParseTupleAndKeywords(args, kwdict, |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 782 | "iO|ii", keywords, |
| 783 | &fd, &map_size_obj, &flags, &prot) |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 784 | ) |
| 785 | return NULL; |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 786 | map_size = _GetMapSize(map_size_obj); |
| 787 | if (map_size < 0) |
| 788 | return NULL; |
| 789 | |
Guido van Rossum | b18618d | 2000-05-03 23:44:39 +0000 | [diff] [blame] | 790 | m_obj = PyObject_New (mmap_object, &mmap_object_type); |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 791 | if (m_obj == NULL) {return NULL;} |
| 792 | m_obj->size = (size_t) map_size; |
| 793 | m_obj->pos = (size_t) 0; |
Andrew M. Kuchling | 7b9fb92 | 2000-06-17 22:41:22 +0000 | [diff] [blame] | 794 | m_obj->fd = fd; |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 795 | m_obj->data = mmap(NULL, map_size, |
| 796 | prot, flags, |
| 797 | fd, 0); |
| 798 | if (m_obj->data == (void *)-1) |
| 799 | { |
| 800 | Py_DECREF(m_obj); |
| 801 | PyErr_SetFromErrno(mmap_module_error); |
| 802 | return NULL; |
| 803 | } |
| 804 | return (PyObject *)m_obj; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 805 | } |
| 806 | #endif /* UNIX */ |
| 807 | |
| 808 | #ifdef MS_WIN32 |
| 809 | static PyObject * |
| 810 | new_mmap_object (PyObject * self, PyObject * args) |
| 811 | { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 812 | mmap_object * m_obj; |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 813 | PyObject *map_size_obj = NULL; |
| 814 | int map_size; |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 815 | char * tagname = ""; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 816 | |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 817 | DWORD dwErr = 0; |
| 818 | int fileno; |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 819 | INT_PTR fh = 0; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 820 | |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 821 | /* Patch the object type */ |
| 822 | mmap_object_type.ob_type = &PyType_Type; |
| 823 | |
| 824 | if (!PyArg_ParseTuple(args, |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 825 | "iO|z", |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 826 | &fileno, |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 827 | &map_size_obj, |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 828 | &tagname) |
| 829 | ) |
| 830 | return NULL; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 831 | |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 832 | map_size = _GetMapSize(map_size_obj); |
| 833 | if (map_size < 0) |
| 834 | return NULL; |
| 835 | |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 836 | /* if an actual filename has been specified */ |
| 837 | if (fileno != 0) { |
| 838 | fh = _get_osfhandle(fileno); |
| 839 | if (fh==-1) { |
| 840 | PyErr_SetFromErrno(mmap_module_error); |
| 841 | return NULL; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 842 | } |
Fred Drake | 1ef4e2d | 2000-04-05 14:15:31 +0000 | [diff] [blame] | 843 | /* Win9x appears to need us seeked to zero */ |
| 844 | fseek(&_iob[fileno], 0, SEEK_SET); |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 845 | } |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 846 | |
Guido van Rossum | b18618d | 2000-05-03 23:44:39 +0000 | [diff] [blame] | 847 | m_obj = PyObject_New (mmap_object, &mmap_object_type); |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 848 | |
| 849 | if (fh) { |
| 850 | m_obj->file_handle = fh; |
| 851 | if (!map_size) { |
| 852 | m_obj->size = GetFileSize ((HANDLE)fh, NULL); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 853 | } else { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 854 | m_obj->size = map_size; |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 855 | } |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 856 | } |
| 857 | else { |
Andrew M. Kuchling | 70d2742 | 2000-06-18 04:45:14 +0000 | [diff] [blame^] | 858 | m_obj->file_handle = (INT_PTR) -1; |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 859 | m_obj->size = map_size; |
| 860 | } |
| 861 | |
| 862 | /* set the initial position */ |
| 863 | m_obj->pos = (size_t) 0; |
| 864 | |
| 865 | m_obj->map_handle = CreateFileMapping ((HANDLE) m_obj->file_handle, |
| 866 | NULL, |
| 867 | PAGE_READWRITE, |
| 868 | 0, |
| 869 | m_obj->size, |
| 870 | tagname); |
| 871 | if (m_obj->map_handle != NULL) { |
| 872 | m_obj->data = (char *) MapViewOfFile (m_obj->map_handle, |
| 873 | FILE_MAP_WRITE, |
| 874 | 0, |
| 875 | 0, |
| 876 | 0); |
| 877 | if (m_obj->data != NULL) { |
| 878 | return ((PyObject *) m_obj); |
| 879 | } else { |
| 880 | dwErr = GetLastError(); |
| 881 | } |
| 882 | } else { |
| 883 | dwErr = GetLastError(); |
| 884 | } |
| 885 | PyErr_SetFromWindowsErr(dwErr); |
| 886 | return (NULL); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 887 | } |
| 888 | #endif /* MS_WIN32 */ |
| 889 | |
| 890 | /* List of functions exported by this module */ |
| 891 | static struct PyMethodDef mmap_functions[] = { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 892 | {"mmap", (PyCFunction) new_mmap_object, |
| 893 | METH_VARARGS|METH_KEYWORDS}, |
| 894 | {NULL, NULL} /* Sentinel */ |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 895 | }; |
| 896 | |
| 897 | #ifdef MS_WIN32 |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 898 | __declspec(dllexport) void |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 899 | #endif /* MS_WIN32 */ |
| 900 | #ifdef UNIX |
| 901 | extern void |
| 902 | #endif |
| 903 | |
| 904 | initmmap(void) |
| 905 | { |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 906 | PyObject *dict, *module; |
| 907 | module = Py_InitModule ("mmap", mmap_functions); |
| 908 | dict = PyModule_GetDict (module); |
| 909 | mmap_module_error = PyExc_EnvironmentError; |
| 910 | Py_INCREF(mmap_module_error); |
| 911 | PyDict_SetItemString (dict, "error", mmap_module_error); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 912 | #ifdef PROT_EXEC |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 913 | PyDict_SetItemString (dict, "PROT_EXEC", PyInt_FromLong(PROT_EXEC) ); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 914 | #endif |
| 915 | #ifdef PROT_READ |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 916 | PyDict_SetItemString (dict, "PROT_READ", PyInt_FromLong(PROT_READ) ); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 917 | #endif |
| 918 | #ifdef PROT_WRITE |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 919 | PyDict_SetItemString (dict, "PROT_WRITE", PyInt_FromLong(PROT_WRITE) ); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 920 | #endif |
| 921 | |
| 922 | #ifdef MAP_SHARED |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 923 | PyDict_SetItemString (dict, "MAP_SHARED", PyInt_FromLong(MAP_SHARED) ); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 924 | #endif |
| 925 | #ifdef MAP_PRIVATE |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 926 | PyDict_SetItemString (dict, "MAP_PRIVATE", |
| 927 | PyInt_FromLong(MAP_PRIVATE) ); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 928 | #endif |
| 929 | #ifdef MAP_DENYWRITE |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 930 | PyDict_SetItemString (dict, "MAP_DENYWRITE", |
| 931 | PyInt_FromLong(MAP_DENYWRITE) ); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 932 | #endif |
| 933 | #ifdef MAP_EXECUTABLE |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 934 | PyDict_SetItemString (dict, "MAP_EXECUTABLE", |
| 935 | PyInt_FromLong(MAP_EXECUTABLE) ); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 936 | #endif |
| 937 | #ifdef MAP_ANON |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 938 | PyDict_SetItemString (dict, "MAP_ANON", PyInt_FromLong(MAP_ANON) ); |
| 939 | PyDict_SetItemString (dict, "MAP_ANONYMOUS", |
| 940 | PyInt_FromLong(MAP_ANON) ); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 941 | #endif |
| 942 | |
| 943 | #ifdef UNIX |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 944 | PyDict_SetItemString (dict, "PAGESIZE", |
| 945 | PyInt_FromLong( (long)getpagesize() ) ); |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 946 | #endif |
Guido van Rossum | 09fdf07 | 2000-03-31 01:17:07 +0000 | [diff] [blame] | 947 | #ifdef MS_WIN32 |
| 948 | { |
| 949 | SYSTEM_INFO si; |
| 950 | GetSystemInfo(&si); |
| 951 | PyDict_SetItemString (dict, "PAGESIZE", |
| 952 | PyInt_FromLong( si.dwPageSize ) ); |
| 953 | } |
| 954 | #endif /* MS_WIN32 */ |
Andrew M. Kuchling | 1ed7d2d | 2000-03-30 21:14:30 +0000 | [diff] [blame] | 955 | |
| 956 | } |
Andrew M. Kuchling | 961fe17 | 2000-06-03 19:41:42 +0000 | [diff] [blame] | 957 | |