Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 1 | /* zlibmodule.c -- gzip-compatible data compression */ |
Martin v. Löwis | 1dbce44 | 2001-10-09 10:54:31 +0000 | [diff] [blame] | 2 | /* See http://www.gzip.org/zlib/ */ |
Mark Hammond | ae8c268 | 2001-01-31 10:28:03 +0000 | [diff] [blame] | 3 | |
Tim Peters | ee826f8 | 2001-01-31 19:39:44 +0000 | [diff] [blame] | 4 | /* Windows users: read Python's PCbuild\readme.txt */ |
Mark Hammond | ae8c268 | 2001-01-31 10:28:03 +0000 | [diff] [blame] | 5 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 6 | |
Guido van Rossum | 97b5457 | 1997-06-03 22:21:47 +0000 | [diff] [blame] | 7 | #include "Python.h" |
| 8 | #include "zlib.h" |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 9 | |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 10 | #ifdef WITH_THREAD |
| 11 | #include "pythread.h" |
| 12 | |
| 13 | /* #defs ripped off from _tkinter.c, even though the situation here is much |
| 14 | simpler, because we don't have to worry about waiting for Tcl |
| 15 | events! And, since zlib itself is threadsafe, we don't need to worry |
| 16 | about re-entering zlib functions. |
| 17 | |
| 18 | What we _do_ have to worry about is releasing the global lock _in |
| 19 | general_ in the zlibmodule functions, because of all the calls to |
| 20 | Python functions, which assume that the global lock is held. So |
| 21 | only two types of calls are wrapped in Py_BEGIN/END_ALLOW_THREADS: |
| 22 | those that grab the zlib lock, and those that involve other |
| 23 | time-consuming functions where we need to worry about holding up |
| 24 | other Python threads. |
| 25 | |
| 26 | We don't need to worry about the string inputs being modified out |
| 27 | from underneath us, because string objects are immutable. However, |
| 28 | we do need to make sure we take on ownership, so that the strings |
| 29 | are not deleted out from under us during a thread swap. |
| 30 | |
| 31 | N.B. |
| 32 | |
| 33 | Since ENTER_ZLIB and LEAVE_ZLIB only need to be called on functions |
| 34 | that modify the components of preexisting de/compress objects, it |
| 35 | could prove to be a performance gain on multiprocessor machines if |
| 36 | there was an de/compress object-specific lock. However, for the |
| 37 | moment the ENTER_ZLIB and LEAVE_ZLIB calls are global for ALL |
| 38 | de/compress objects. |
| 39 | |
| 40 | */ |
| 41 | |
| 42 | static PyThread_type_lock zlib_lock = NULL; /* initialized on module load */ |
| 43 | |
| 44 | #define ENTER_ZLIB \ |
| 45 | { Py_BEGIN_ALLOW_THREADS PyThread_acquire_lock(zlib_lock, 1); \ |
| 46 | Py_END_ALLOW_THREADS |
| 47 | |
| 48 | #define LEAVE_ZLIB \ |
| 49 | PyThread_release_lock(zlib_lock); } |
| 50 | |
| 51 | #else |
| 52 | |
| 53 | #define ENTER_ZLIB |
| 54 | #define LEAVE_ZLIB |
| 55 | |
| 56 | #endif |
| 57 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 58 | /* The following parameters are copied from zutil.h, version 0.95 */ |
| 59 | #define DEFLATED 8 |
| 60 | #if MAX_MEM_LEVEL >= 8 |
| 61 | # define DEF_MEM_LEVEL 8 |
| 62 | #else |
| 63 | # define DEF_MEM_LEVEL MAX_MEM_LEVEL |
| 64 | #endif |
| 65 | #define DEF_WBITS MAX_WBITS |
| 66 | |
Guido van Rossum | b729a1d | 1999-04-07 20:23:17 +0000 | [diff] [blame] | 67 | /* The output buffer will be increased in chunks of DEFAULTALLOC bytes. */ |
| 68 | #define DEFAULTALLOC (16*1024) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 69 | #define PyInit_zlib initzlib |
| 70 | |
| 71 | staticforward PyTypeObject Comptype; |
| 72 | staticforward PyTypeObject Decomptype; |
| 73 | |
| 74 | static PyObject *ZlibError; |
| 75 | |
| 76 | typedef struct |
| 77 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 78 | PyObject_HEAD |
| 79 | z_stream zst; |
| 80 | PyObject *unused_data; |
| 81 | PyObject *unconsumed_tail; |
| 82 | int is_initialised; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 83 | } compobject; |
| 84 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 85 | static char compressobj__doc__[] = |
| 86 | "compressobj() -- Return a compressor object.\n" |
| 87 | "compressobj(level) -- Return a compressor object, using the given compression level.\n" |
| 88 | ; |
| 89 | |
| 90 | static char decompressobj__doc__[] = |
| 91 | "decompressobj() -- Return a decompressor object.\n" |
| 92 | "decompressobj(wbits) -- Return a decompressor object, setting the window buffer size to wbits.\n" |
| 93 | ; |
| 94 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 95 | static compobject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 96 | newcompobject(PyTypeObject *type) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 97 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 98 | compobject *self; |
| 99 | self = PyObject_New(compobject, type); |
| 100 | if (self == NULL) |
| 101 | return NULL; |
| 102 | self->is_initialised = 0; |
| 103 | self->unused_data = PyString_FromString(""); |
| 104 | if (self->unused_data == NULL) { |
| 105 | Py_DECREF(self); |
| 106 | return NULL; |
| 107 | } |
| 108 | self->unconsumed_tail = PyString_FromString(""); |
| 109 | if (self->unconsumed_tail == NULL) { |
| 110 | Py_DECREF(self); |
| 111 | return NULL; |
| 112 | } |
| 113 | return self; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 114 | } |
| 115 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 116 | static char compress__doc__[] = |
| 117 | "compress(string) -- Compress string using the default compression level, " |
| 118 | "returning a string containing compressed data.\n" |
| 119 | "compress(string, level) -- Compress string, using the chosen compression " |
| 120 | "level (from 1 to 9). Return a string containing the compressed data.\n" |
| 121 | ; |
| 122 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 123 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 124 | PyZlib_compress(PyObject *self, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 125 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 126 | PyObject *ReturnVal = NULL; |
| 127 | Byte *input, *output; |
| 128 | int length, level=Z_DEFAULT_COMPRESSION, err; |
| 129 | z_stream zst; |
| 130 | int return_error; |
| 131 | PyObject * inputString; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 132 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 133 | /* require Python string object, optional 'level' arg */ |
| 134 | if (!PyArg_ParseTuple(args, "S|i:compress", &inputString, &level)) |
| 135 | return NULL; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 136 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 137 | /* now get a pointer to the internal string */ |
| 138 | if (PyString_AsStringAndSize(inputString, (char**)&input, &length) == -1) |
| 139 | return NULL; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 140 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 141 | zst.avail_out = length + length/1000 + 12 + 1; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 142 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 143 | output=(Byte*)malloc(zst.avail_out); |
| 144 | if (output==NULL) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 145 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 146 | PyErr_SetString(PyExc_MemoryError, |
| 147 | "Can't allocate memory to compress data"); |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 148 | return NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 149 | } |
Jeremy Hylton | a37e244 | 1998-12-18 22:13:11 +0000 | [diff] [blame] | 150 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 151 | /* Past the point of no return. From here on out, we need to make sure |
| 152 | we clean up mallocs & INCREFs. */ |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 153 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 154 | Py_INCREF(inputString); /* increment so that we hold ref */ |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 155 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 156 | zst.zalloc=(alloc_func)NULL; |
| 157 | zst.zfree=(free_func)Z_NULL; |
| 158 | zst.next_out=(Byte *)output; |
| 159 | zst.next_in =(Byte *)input; |
| 160 | zst.avail_in=length; |
| 161 | err=deflateInit(&zst, level); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 162 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 163 | return_error = 0; |
| 164 | switch(err) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 165 | { |
| 166 | case(Z_OK): |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 167 | break; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 168 | case(Z_MEM_ERROR): |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 169 | PyErr_SetString(PyExc_MemoryError, |
| 170 | "Out of memory while compressing data"); |
| 171 | return_error = 1; |
| 172 | break; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 173 | case(Z_STREAM_ERROR): |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 174 | PyErr_SetString(ZlibError, |
| 175 | "Bad compression level"); |
| 176 | return_error = 1; |
| 177 | break; |
| 178 | default: { |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 179 | if (zst.msg == Z_NULL) |
| 180 | PyErr_Format(ZlibError, "Error %i while compressing data", |
| 181 | err); |
| 182 | else |
| 183 | PyErr_Format(ZlibError, "Error %i while compressing data: %.200s", |
| 184 | err, zst.msg); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 185 | deflateEnd(&zst); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 186 | return_error = 1; |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 187 | } |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 188 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 189 | |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 190 | if (!return_error) { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 191 | Py_BEGIN_ALLOW_THREADS; |
| 192 | err=deflate(&zst, Z_FINISH); |
| 193 | Py_END_ALLOW_THREADS; |
| 194 | |
| 195 | switch(err) |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 196 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 197 | case(Z_STREAM_END): |
| 198 | break; |
| 199 | /* Are there other errors to be trapped here? */ |
| 200 | default: { |
| 201 | if (zst.msg == Z_NULL) |
| 202 | PyErr_Format(ZlibError, "Error %i while compressing data", |
| 203 | err); |
| 204 | else |
| 205 | PyErr_Format(ZlibError, "Error %i while compressing data: %.200s", |
| 206 | err, zst.msg); |
| 207 | |
| 208 | deflateEnd(&zst); |
| 209 | |
| 210 | return_error = 1; |
| 211 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 212 | } |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 213 | |
| 214 | if (!return_error) { |
| 215 | err=deflateEnd(&zst); |
| 216 | if (err == Z_OK) |
| 217 | ReturnVal = PyString_FromStringAndSize((char *)output, |
| 218 | zst.total_out); |
| 219 | else { |
| 220 | if (zst.msg == Z_NULL) |
| 221 | PyErr_Format(ZlibError, |
| 222 | "Error %i while finishing compression", |
| 223 | err); |
| 224 | else |
| 225 | PyErr_Format(ZlibError, |
| 226 | "Error %i while finishing compression: %.200s", |
| 227 | err, zst.msg); |
| 228 | } |
| 229 | } |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 230 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 231 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 232 | free(output); |
| 233 | Py_DECREF(inputString); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 234 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 235 | return ReturnVal; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 236 | } |
| 237 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 238 | static char decompress__doc__[] = |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 239 | "decompress(string) -- Decompress the data in string, returning a string containing the decompressed data.\n" |
| 240 | "decompress(string, wbits) -- Decompress the data in string with a window buffer size of wbits.\n" |
| 241 | "decompress(string, wbits, bufsize) -- Decompress the data in string with a window buffer size of wbits and an initial output buffer size of bufsize.\n" |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 242 | ; |
| 243 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 244 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 245 | PyZlib_decompress(PyObject *self, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 246 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 247 | PyObject *result_str; |
| 248 | Byte *input; |
| 249 | int length, err; |
| 250 | int wsize=DEF_WBITS, r_strlen=DEFAULTALLOC; |
| 251 | z_stream zst; |
| 252 | int return_error; |
| 253 | PyObject * inputString; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 254 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 255 | if (!PyArg_ParseTuple(args, "S|ii:decompress", |
| 256 | &inputString, &wsize, &r_strlen)) |
| 257 | return NULL; |
| 258 | if (PyString_AsStringAndSize(inputString, (char**)&input, &length) == -1) |
| 259 | return NULL; |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 260 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 261 | if (r_strlen <= 0) |
| 262 | r_strlen = 1; |
Jeremy Hylton | a37e244 | 1998-12-18 22:13:11 +0000 | [diff] [blame] | 263 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 264 | zst.avail_in = length; |
| 265 | zst.avail_out = r_strlen; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 266 | |
Jeremy Hylton | 9bc9d66 | 2001-10-16 21:23:58 +0000 | [diff] [blame^] | 267 | if (!(result_str = PyString_FromStringAndSize(NULL, r_strlen))) |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 268 | return NULL; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 269 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 270 | /* Past the point of no return. From here on out, we need to make sure |
| 271 | we clean up mallocs & INCREFs. */ |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 272 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 273 | Py_INCREF(inputString); /* increment so that we hold ref */ |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 274 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 275 | zst.zalloc = (alloc_func)NULL; |
| 276 | zst.zfree = (free_func)Z_NULL; |
| 277 | zst.next_out = (Byte *)PyString_AsString(result_str); |
| 278 | zst.next_in = (Byte *)input; |
| 279 | err = inflateInit2(&zst, wsize); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 280 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 281 | return_error = 0; |
| 282 | switch(err) { |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 283 | case(Z_OK): |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 284 | break; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 285 | case(Z_MEM_ERROR): |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 286 | PyErr_SetString(PyExc_MemoryError, |
| 287 | "Out of memory while decompressing data"); |
| 288 | return_error = 1; |
| 289 | default: { |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 290 | if (zst.msg == Z_NULL) |
| 291 | PyErr_Format(ZlibError, "Error %i preparing to decompress data", |
| 292 | err); |
| 293 | else |
| 294 | PyErr_Format(ZlibError, |
| 295 | "Error %i while preparing to decompress data: %.200s", |
| 296 | err, zst.msg); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 297 | inflateEnd(&zst); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 298 | |
| 299 | return_error = 1; |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 300 | } |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 301 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 302 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 303 | do { |
| 304 | if (return_error) |
| 305 | break; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 306 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 307 | Py_BEGIN_ALLOW_THREADS |
| 308 | err=inflate(&zst, Z_FINISH); |
| 309 | Py_END_ALLOW_THREADS |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 310 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 311 | switch(err) { |
| 312 | case(Z_STREAM_END): |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 313 | break; |
Guido van Rossum | 115f517 | 1998-04-23 20:22:11 +0000 | [diff] [blame] | 314 | case(Z_BUF_ERROR): |
Andrew M. Kuchling | d923831 | 2000-10-09 14:18:10 +0000 | [diff] [blame] | 315 | /* |
| 316 | * If there is at least 1 byte of room according to zst.avail_out |
| 317 | * and we get this error, assume that it means zlib cannot |
| 318 | * process the inflate call() due to an error in the data. |
| 319 | */ |
| 320 | if (zst.avail_out > 0) |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 321 | { |
| 322 | PyErr_Format(ZlibError, "Error %i while decompressing data", |
| 323 | err); |
| 324 | inflateEnd(&zst); |
| 325 | return_error = 1; |
| 326 | break; |
| 327 | } |
Andrew M. Kuchling | d923831 | 2000-10-09 14:18:10 +0000 | [diff] [blame] | 328 | /* fall through */ |
| 329 | case(Z_OK): |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 330 | /* need more memory */ |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 331 | if (_PyString_Resize(&result_str, r_strlen << 1) == -1) { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 332 | inflateEnd(&zst); |
| 333 | result_str = NULL; |
| 334 | return_error = 1; |
| 335 | } |
| 336 | zst.next_out = (unsigned char *)PyString_AsString(result_str) \ |
| 337 | + r_strlen; |
| 338 | zst.avail_out = r_strlen; |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 339 | r_strlen = r_strlen << 1; |
| 340 | break; |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 341 | default: { |
| 342 | if (zst.msg == Z_NULL) |
| 343 | PyErr_Format(ZlibError, "Error %i while decompressing data", |
| 344 | err); |
| 345 | else |
| 346 | PyErr_Format(ZlibError, |
| 347 | "Error %i while decompressing data: %.200s", |
| 348 | err, zst.msg); |
| 349 | inflateEnd(&zst); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 350 | return_error = 1; |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 351 | } |
| 352 | } |
| 353 | } while (err != Z_STREAM_END); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 354 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 355 | if (!return_error) { |
| 356 | err = inflateEnd(&zst); |
| 357 | if (err != Z_OK) { |
| 358 | if (zst.msg == Z_NULL) |
| 359 | PyErr_Format(ZlibError, |
| 360 | "Error %i while finishing data decompression", |
| 361 | err); |
| 362 | else |
| 363 | PyErr_Format(ZlibError, |
| 364 | "Error %i while finishing data decompression: %.200s", |
| 365 | err, zst.msg); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 366 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 367 | return_error = 1; |
| 368 | return NULL; |
| 369 | } |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 370 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 371 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 372 | if (!return_error) |
| 373 | _PyString_Resize(&result_str, zst.total_out); |
| 374 | else |
| 375 | Py_XDECREF(result_str); /* sets result_str == NULL, if not already */ |
| 376 | Py_DECREF(inputString); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 377 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 378 | return result_str; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 379 | } |
| 380 | |
| 381 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 382 | PyZlib_compressobj(PyObject *selfptr, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 383 | { |
| 384 | compobject *self; |
| 385 | int level=Z_DEFAULT_COMPRESSION, method=DEFLATED; |
| 386 | int wbits=MAX_WBITS, memLevel=DEF_MEM_LEVEL, strategy=0, err; |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 387 | |
Guido van Rossum | 43713e5 | 2000-02-29 13:59:29 +0000 | [diff] [blame] | 388 | if (!PyArg_ParseTuple(args, "|iiiii:compressobj", &level, &method, &wbits, |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 389 | &memLevel, &strategy)) |
| 390 | return NULL; |
| 391 | |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 392 | self = newcompobject(&Comptype); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 393 | if (self==NULL) return(NULL); |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 394 | self->zst.zalloc = (alloc_func)NULL; |
| 395 | self->zst.zfree = (free_func)Z_NULL; |
| 396 | err = deflateInit2(&self->zst, level, method, wbits, memLevel, strategy); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 397 | switch(err) |
| 398 | { |
| 399 | case (Z_OK): |
Andrew M. Kuchling | 1c7aaa2 | 1999-01-29 21:49:34 +0000 | [diff] [blame] | 400 | self->is_initialised = 1; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 401 | return (PyObject*)self; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 402 | case (Z_MEM_ERROR): |
Andrew M. Kuchling | 1c7aaa2 | 1999-01-29 21:49:34 +0000 | [diff] [blame] | 403 | Py_DECREF(self); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 404 | PyErr_SetString(PyExc_MemoryError, |
| 405 | "Can't allocate memory for compression object"); |
| 406 | return NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 407 | case(Z_STREAM_ERROR): |
Andrew M. Kuchling | 1c7aaa2 | 1999-01-29 21:49:34 +0000 | [diff] [blame] | 408 | Py_DECREF(self); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 409 | PyErr_SetString(PyExc_ValueError, |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 410 | "Invalid initialization option"); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 411 | return NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 412 | default: |
| 413 | { |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 414 | if (self->zst.msg == Z_NULL) |
| 415 | PyErr_Format(ZlibError, |
| 416 | "Error %i while creating compression object", |
| 417 | err); |
| 418 | else |
| 419 | PyErr_Format(ZlibError, |
| 420 | "Error %i while creating compression object: %.200s", |
| 421 | err, self->zst.msg); |
Andrew M. Kuchling | 1c7aaa2 | 1999-01-29 21:49:34 +0000 | [diff] [blame] | 422 | Py_DECREF(self); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 423 | return NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 424 | } |
| 425 | } |
| 426 | } |
| 427 | |
| 428 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 429 | PyZlib_decompressobj(PyObject *selfptr, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 430 | { |
| 431 | int wbits=DEF_WBITS, err; |
| 432 | compobject *self; |
Guido van Rossum | 43713e5 | 2000-02-29 13:59:29 +0000 | [diff] [blame] | 433 | if (!PyArg_ParseTuple(args, "|i:decompressobj", &wbits)) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 434 | { |
| 435 | return NULL; |
| 436 | } |
| 437 | self=newcompobject(&Decomptype); |
| 438 | if (self==NULL) return(NULL); |
Guido van Rossum | 97b5457 | 1997-06-03 22:21:47 +0000 | [diff] [blame] | 439 | self->zst.zalloc=(alloc_func)NULL; |
| 440 | self->zst.zfree=(free_func)Z_NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 441 | err=inflateInit2(&self->zst, wbits); |
| 442 | switch(err) |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 443 | { |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 444 | case (Z_OK): |
Andrew M. Kuchling | 1c7aaa2 | 1999-01-29 21:49:34 +0000 | [diff] [blame] | 445 | self->is_initialised = 1; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 446 | return (PyObject*)self; |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 447 | case(Z_STREAM_ERROR): |
Andrew M. Kuchling | 1c7aaa2 | 1999-01-29 21:49:34 +0000 | [diff] [blame] | 448 | Py_DECREF(self); |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 449 | PyErr_SetString(PyExc_ValueError, |
| 450 | "Invalid initialization option"); |
| 451 | return NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 452 | case (Z_MEM_ERROR): |
Andrew M. Kuchling | 1c7aaa2 | 1999-01-29 21:49:34 +0000 | [diff] [blame] | 453 | Py_DECREF(self); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 454 | PyErr_SetString(PyExc_MemoryError, |
| 455 | "Can't allocate memory for decompression object"); |
| 456 | return NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 457 | default: |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 458 | { |
| 459 | if (self->zst.msg == Z_NULL) |
| 460 | PyErr_Format(ZlibError, |
| 461 | "Error %i while creating decompression object", |
| 462 | err); |
| 463 | else |
| 464 | PyErr_Format(ZlibError, |
| 465 | "Error %i while creating decompression object: %.200s", |
| 466 | err, self->zst.msg); |
Andrew M. Kuchling | 1c7aaa2 | 1999-01-29 21:49:34 +0000 | [diff] [blame] | 467 | Py_DECREF(self); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 468 | return NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 469 | } |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 470 | } |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 471 | } |
| 472 | |
| 473 | static void |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 474 | Comp_dealloc(compobject *self) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 475 | { |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 476 | ENTER_ZLIB |
| 477 | |
Andrew M. Kuchling | 1c7aaa2 | 1999-01-29 21:49:34 +0000 | [diff] [blame] | 478 | if (self->is_initialised) |
| 479 | deflateEnd(&self->zst); |
Andrew M. Kuchling | b95227d | 1999-03-25 21:21:08 +0000 | [diff] [blame] | 480 | Py_XDECREF(self->unused_data); |
Jeremy Hylton | 511e2ca | 2001-10-16 20:39:49 +0000 | [diff] [blame] | 481 | Py_XDECREF(self->unconsumed_tail); |
Guido van Rossum | b18618d | 2000-05-03 23:44:39 +0000 | [diff] [blame] | 482 | PyObject_Del(self); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 483 | |
| 484 | LEAVE_ZLIB |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 485 | } |
| 486 | |
| 487 | static void |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 488 | Decomp_dealloc(compobject *self) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 489 | { |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 490 | ENTER_ZLIB |
| 491 | |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 492 | if (self->is_initialised) |
| 493 | inflateEnd(&self->zst); |
Andrew M. Kuchling | b95227d | 1999-03-25 21:21:08 +0000 | [diff] [blame] | 494 | Py_XDECREF(self->unused_data); |
Jeremy Hylton | 511e2ca | 2001-10-16 20:39:49 +0000 | [diff] [blame] | 495 | Py_XDECREF(self->unconsumed_tail); |
Guido van Rossum | b18618d | 2000-05-03 23:44:39 +0000 | [diff] [blame] | 496 | PyObject_Del(self); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 497 | |
| 498 | LEAVE_ZLIB |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 499 | } |
| 500 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 501 | static char comp_compress__doc__[] = |
| 502 | "compress(data) -- Return a string containing a compressed version of the data.\n\n" |
| 503 | "After calling this function, some of the input data may still\n" |
| 504 | "be stored in internal buffers for later processing.\n" |
| 505 | "Call the flush() method to clear these buffers." |
| 506 | ; |
| 507 | |
| 508 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 509 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 510 | PyZlib_objcompress(compobject *self, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 511 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 512 | int err, inplen, length = DEFAULTALLOC; |
| 513 | PyObject *RetVal; |
| 514 | Byte *input; |
| 515 | unsigned long start_total_out; |
| 516 | int return_error; |
| 517 | PyObject * inputString; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 518 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 519 | if (!PyArg_ParseTuple(args, "S:compress", &inputString)) |
| 520 | return NULL; |
| 521 | if (PyString_AsStringAndSize(inputString, (char**)&input, &inplen) == -1) |
| 522 | return NULL; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 523 | |
Jeremy Hylton | 9bc9d66 | 2001-10-16 21:23:58 +0000 | [diff] [blame^] | 524 | if (!(RetVal = PyString_FromStringAndSize(NULL, length))) |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 525 | return NULL; |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 526 | |
| 527 | ENTER_ZLIB |
| 528 | |
| 529 | Py_INCREF(inputString); |
| 530 | |
| 531 | start_total_out = self->zst.total_out; |
| 532 | self->zst.avail_in = inplen; |
| 533 | self->zst.next_in = input; |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 534 | self->zst.avail_out = length; |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 535 | self->zst.next_out = (unsigned char *)PyString_AsString(RetVal); |
| 536 | |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 537 | Py_BEGIN_ALLOW_THREADS |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 538 | err = deflate(&(self->zst), Z_NO_FLUSH); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 539 | Py_END_ALLOW_THREADS |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 540 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 541 | return_error = 0; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 542 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 543 | /* while Z_OK and the output buffer is full, there might be more output, |
| 544 | so extend the output buffer and try again */ |
| 545 | while (err == Z_OK && self->zst.avail_out == 0) { |
| 546 | if (_PyString_Resize(&RetVal, length << 1) == -1) { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 547 | return_error = 1; |
| 548 | break; |
| 549 | } |
| 550 | self->zst.next_out = (unsigned char *)PyString_AsString(RetVal) \ |
| 551 | + length; |
| 552 | self->zst.avail_out = length; |
| 553 | length = length << 1; |
| 554 | |
| 555 | Py_BEGIN_ALLOW_THREADS |
| 556 | err = deflate(&(self->zst), Z_NO_FLUSH); |
| 557 | Py_END_ALLOW_THREADS |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 558 | } |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 559 | /* We will only get Z_BUF_ERROR if the output buffer was full but |
| 560 | there wasn't more output when we tried again, so it is not an error |
| 561 | condition. |
| 562 | */ |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 563 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 564 | if (!return_error) { |
| 565 | if (err != Z_OK && err != Z_BUF_ERROR) { |
| 566 | if (self->zst.msg == Z_NULL) |
| 567 | PyErr_Format(ZlibError, "Error %i while compressing", |
| 568 | err); |
| 569 | else |
| 570 | PyErr_Format(ZlibError, "Error %i while compressing: %.200s", |
| 571 | err, self->zst.msg); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 572 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 573 | return_error = 1; |
| 574 | Py_DECREF(RetVal); |
| 575 | } |
| 576 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 577 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 578 | if (return_error) |
| 579 | RetVal = NULL; /* should have been handled by DECREF */ |
| 580 | else |
| 581 | _PyString_Resize(&RetVal, self->zst.total_out - start_total_out); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 582 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 583 | Py_DECREF(inputString); |
| 584 | |
| 585 | LEAVE_ZLIB |
| 586 | |
| 587 | return RetVal; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 588 | } |
| 589 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 590 | static char decomp_decompress__doc__[] = |
Jeremy Hylton | 511e2ca | 2001-10-16 20:39:49 +0000 | [diff] [blame] | 591 | "decompress(data, max_length) -- Return a string containing\n" |
| 592 | "the decompressed version of the data.\n\n" |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 593 | "After calling this function, some of the input data may still\n" |
| 594 | "be stored in internal buffers for later processing.\n" |
Jeremy Hylton | 511e2ca | 2001-10-16 20:39:49 +0000 | [diff] [blame] | 595 | "Call the flush() method to clear these buffers.\n" |
| 596 | "If the max_length parameter is specified then the return value will be\n" |
| 597 | "no longer than max_length. Unconsumed input data will be stored in\n" |
| 598 | "the unconsumed_tail attribute." |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 599 | ; |
| 600 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 601 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 602 | PyZlib_objdecompress(compobject *self, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 603 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 604 | int err, inplen, old_length, length = DEFAULTALLOC; |
| 605 | int max_length = 0; |
| 606 | PyObject *RetVal; |
| 607 | Byte *input; |
| 608 | unsigned long start_total_out; |
| 609 | int return_error; |
| 610 | PyObject * inputString; |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 611 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 612 | if (!PyArg_ParseTuple(args, "S|i:decompress", &inputString, &max_length)) |
| 613 | return NULL; |
| 614 | if (max_length < 0) { |
| 615 | PyErr_SetString(PyExc_ValueError, |
| 616 | "max_length must be greater than zero"); |
| 617 | return NULL; |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 618 | } |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 619 | |
| 620 | if (PyString_AsStringAndSize(inputString, (char**)&input, &inplen) == -1) |
| 621 | return NULL; |
| 622 | |
| 623 | /* limit amount of data allocated to max_length */ |
| 624 | if (max_length && length > max_length) |
| 625 | length = max_length; |
Jeremy Hylton | 9bc9d66 | 2001-10-16 21:23:58 +0000 | [diff] [blame^] | 626 | if (!(RetVal = PyString_FromStringAndSize(NULL, length))) |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 627 | return NULL; |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 628 | |
| 629 | ENTER_ZLIB |
| 630 | return_error = 0; |
| 631 | |
| 632 | Py_INCREF(inputString); |
| 633 | |
| 634 | start_total_out = self->zst.total_out; |
| 635 | self->zst.avail_in = inplen; |
| 636 | self->zst.next_in = input; |
| 637 | self->zst.avail_out = length; |
| 638 | self->zst.next_out = (unsigned char *)PyString_AsString(RetVal); |
Jeremy Hylton | 511e2ca | 2001-10-16 20:39:49 +0000 | [diff] [blame] | 639 | |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 640 | Py_BEGIN_ALLOW_THREADS |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 641 | err = inflate(&(self->zst), Z_SYNC_FLUSH); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 642 | Py_END_ALLOW_THREADS |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 643 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 644 | /* While Z_OK and the output buffer is full, there might be more output. |
| 645 | So extend the output buffer and try again. |
| 646 | */ |
| 647 | while (err == Z_OK && self->zst.avail_out == 0) { |
| 648 | /* If max_length set, don't continue decompressing if we've already |
| 649 | reached the limit. |
| 650 | */ |
| 651 | if (max_length && length >= max_length) |
| 652 | break; |
Jeremy Hylton | 511e2ca | 2001-10-16 20:39:49 +0000 | [diff] [blame] | 653 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 654 | /* otherwise, ... */ |
| 655 | old_length = length; |
| 656 | length = length << 1; |
| 657 | if (max_length && length > max_length) |
| 658 | length = max_length; |
| 659 | |
| 660 | if (_PyString_Resize(&RetVal, length) == -1) { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 661 | return_error = 1; |
| 662 | break; |
| 663 | } |
| 664 | self->zst.next_out = (unsigned char *)PyString_AsString(RetVal) \ |
| 665 | + old_length; |
| 666 | self->zst.avail_out = length - old_length; |
| 667 | |
| 668 | Py_BEGIN_ALLOW_THREADS |
| 669 | err = inflate(&(self->zst), Z_SYNC_FLUSH); |
| 670 | Py_END_ALLOW_THREADS |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 671 | } |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 672 | |
| 673 | /* Not all of the compressed data could be accomodated in the output buffer |
| 674 | of specified size. Return the unconsumed tail in an attribute.*/ |
| 675 | if(max_length) { |
| 676 | Py_DECREF(self->unconsumed_tail); |
| 677 | self->unconsumed_tail = PyString_FromStringAndSize(self->zst.next_in, |
| 678 | self->zst.avail_in); |
| 679 | if(!self->unconsumed_tail) |
| 680 | return_error = 1; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 681 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 682 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 683 | /* The end of the compressed data has been reached, so set the |
| 684 | unused_data attribute to a string containing the remainder of the |
| 685 | data in the string. Note that this is also a logical place to call |
| 686 | inflateEnd, but the old behaviour of only calling it on flush() is |
| 687 | preserved. |
| 688 | */ |
| 689 | if (!return_error) { |
| 690 | if (err == Z_STREAM_END) { |
| 691 | Py_XDECREF(self->unused_data); /* Free original empty string */ |
| 692 | self->unused_data = PyString_FromStringAndSize( |
| 693 | (char *)self->zst.next_in, self->zst.avail_in); |
| 694 | if (self->unused_data == NULL) { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 695 | Py_DECREF(RetVal); |
| 696 | return_error = 1; |
| 697 | } |
| 698 | /* We will only get Z_BUF_ERROR if the output buffer was full |
| 699 | but there wasn't more output when we tried again, so it is |
| 700 | not an error condition. |
| 701 | */ |
| 702 | } else if (err != Z_OK && err != Z_BUF_ERROR) { |
| 703 | if (self->zst.msg == Z_NULL) |
| 704 | PyErr_Format(ZlibError, "Error %i while decompressing", |
| 705 | err); |
| 706 | else |
| 707 | PyErr_Format(ZlibError, "Error %i while decompressing: %.200s", |
| 708 | err, self->zst.msg); |
| 709 | Py_DECREF(RetVal); |
| 710 | return_error = 1; |
| 711 | } |
| 712 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 713 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 714 | if (!return_error) { |
| 715 | _PyString_Resize(&RetVal, self->zst.total_out - start_total_out); |
| 716 | } |
| 717 | else |
| 718 | RetVal = NULL; /* should be handled by DECREF */ |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 719 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 720 | Py_DECREF(inputString); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 721 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 722 | LEAVE_ZLIB |
| 723 | |
| 724 | return RetVal; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 725 | } |
| 726 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 727 | static char comp_flush__doc__[] = |
Jeremy Hylton | a37e244 | 1998-12-18 22:13:11 +0000 | [diff] [blame] | 728 | "flush( [mode] ) -- Return a string containing any remaining compressed data.\n" |
| 729 | "mode can be one of the constants Z_SYNC_FLUSH, Z_FULL_FLUSH, Z_FINISH; the \n" |
| 730 | "default value used when mode is not specified is Z_FINISH.\n" |
| 731 | "If mode == Z_FINISH, the compressor object can no longer be used after\n" |
| 732 | "calling the flush() method. Otherwise, more data can still be compressed.\n" |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 733 | ; |
| 734 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 735 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 736 | PyZlib_flush(compobject *self, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 737 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 738 | int err, length = DEFAULTALLOC; |
| 739 | PyObject *RetVal; |
| 740 | int flushmode = Z_FINISH; |
| 741 | unsigned long start_total_out; |
| 742 | int return_error; |
Jeremy Hylton | a37e244 | 1998-12-18 22:13:11 +0000 | [diff] [blame] | 743 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 744 | if (!PyArg_ParseTuple(args, "|i:flush", &flushmode)) |
| 745 | return NULL; |
Jeremy Hylton | a37e244 | 1998-12-18 22:13:11 +0000 | [diff] [blame] | 746 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 747 | /* Flushing with Z_NO_FLUSH is a no-op, so there's no point in |
| 748 | doing any work at all; just return an empty string. */ |
| 749 | if (flushmode == Z_NO_FLUSH) { |
| 750 | return PyString_FromStringAndSize(NULL, 0); |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 751 | } |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 752 | |
Jeremy Hylton | 9bc9d66 | 2001-10-16 21:23:58 +0000 | [diff] [blame^] | 753 | if (!(RetVal = PyString_FromStringAndSize(NULL, length))) |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 754 | return NULL; |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 755 | |
| 756 | ENTER_ZLIB |
| 757 | |
| 758 | start_total_out = self->zst.total_out; |
| 759 | self->zst.avail_in = 0; |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 760 | self->zst.avail_out = length; |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 761 | self->zst.next_out = (unsigned char *)PyString_AsString(RetVal); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 762 | |
| 763 | Py_BEGIN_ALLOW_THREADS |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 764 | err = deflate(&(self->zst), flushmode); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 765 | Py_END_ALLOW_THREADS |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 766 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 767 | return_error = 0; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 768 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 769 | /* while Z_OK and the output buffer is full, there might be more output, |
| 770 | so extend the output buffer and try again */ |
| 771 | while (err == Z_OK && self->zst.avail_out == 0) { |
| 772 | if (_PyString_Resize(&RetVal, length << 1) == -1) { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 773 | return_error = 1; |
| 774 | break; |
| 775 | } |
| 776 | self->zst.next_out = (unsigned char *)PyString_AsString(RetVal) \ |
| 777 | + length; |
| 778 | self->zst.avail_out = length; |
| 779 | length = length << 1; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 780 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 781 | Py_BEGIN_ALLOW_THREADS |
| 782 | err = deflate(&(self->zst), flushmode); |
| 783 | Py_END_ALLOW_THREADS |
Jeremy Hylton | a37e244 | 1998-12-18 22:13:11 +0000 | [diff] [blame] | 784 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 785 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 786 | /* If flushmode is Z_FINISH, we also have to call deflateEnd() to free |
| 787 | various data structures. Note we should only get Z_STREAM_END when |
| 788 | flushmode is Z_FINISH, but checking both for safety*/ |
| 789 | if (!return_error) { |
| 790 | if (err == Z_STREAM_END && flushmode == Z_FINISH) { |
| 791 | err = deflateEnd(&(self->zst)); |
| 792 | if (err != Z_OK) { |
| 793 | if (self->zst.msg == Z_NULL) |
| 794 | PyErr_Format(ZlibError, "Error %i from deflateEnd()", |
| 795 | err); |
| 796 | else |
| 797 | PyErr_Format(ZlibError, |
| 798 | "Error %i from deflateEnd(): %.200s", |
| 799 | err, self->zst.msg); |
| 800 | |
| 801 | Py_DECREF(RetVal); |
| 802 | return_error = 1; |
| 803 | } else |
| 804 | self->is_initialised = 0; |
| 805 | |
| 806 | /* We will only get Z_BUF_ERROR if the output buffer was full |
| 807 | but there wasn't more output when we tried again, so it is |
| 808 | not an error condition. |
| 809 | */ |
| 810 | } else if (err!=Z_OK && err!=Z_BUF_ERROR) { |
| 811 | if (self->zst.msg == Z_NULL) |
| 812 | PyErr_Format(ZlibError, "Error %i while flushing", |
| 813 | err); |
| 814 | else |
| 815 | PyErr_Format(ZlibError, "Error %i while flushing: %.200s", |
| 816 | err, self->zst.msg); |
| 817 | Py_DECREF(RetVal); |
| 818 | return_error = 1; |
| 819 | } |
| 820 | } |
| 821 | |
| 822 | if (!return_error) |
| 823 | _PyString_Resize(&RetVal, self->zst.total_out - start_total_out); |
| 824 | else |
| 825 | RetVal = NULL; /* should have been handled by DECREF */ |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 826 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 827 | LEAVE_ZLIB |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 828 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 829 | return RetVal; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 830 | } |
| 831 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 832 | static char decomp_flush__doc__[] = |
| 833 | "flush() -- Return a string containing any remaining decompressed data. " |
| 834 | "The decompressor object can no longer be used after this call." |
| 835 | ; |
| 836 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 837 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 838 | PyZlib_unflush(compobject *self, PyObject *args) |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 839 | /*decompressor flush is a no-op because all pending data would have been |
| 840 | flushed by the decompress method. However, this routine previously called |
| 841 | inflateEnd, causing any further decompress or flush calls to raise |
| 842 | exceptions. This behaviour has been preserved.*/ |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 843 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 844 | int err; |
| 845 | PyObject * retval; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 846 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 847 | if (!PyArg_ParseTuple(args, "")) |
| 848 | return NULL; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 849 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 850 | ENTER_ZLIB |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 851 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 852 | err = inflateEnd(&(self->zst)); |
| 853 | if (err != Z_OK) { |
| 854 | if (self->zst.msg == Z_NULL) |
| 855 | PyErr_Format(ZlibError, "Error %i from inflateEnd()", |
| 856 | err); |
| 857 | else |
| 858 | PyErr_Format(ZlibError, "Error %i from inflateEnd(): %.200s", |
| 859 | err, self->zst.msg); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 860 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 861 | retval = NULL; |
| 862 | } else { |
| 863 | self->is_initialised = 0; |
| 864 | retval = PyString_FromStringAndSize(NULL, 0); |
| 865 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 866 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 867 | LEAVE_ZLIB |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 868 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 869 | return retval; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 870 | } |
| 871 | |
| 872 | static PyMethodDef comp_methods[] = |
| 873 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 874 | {"compress", (binaryfunc)PyZlib_objcompress, METH_VARARGS, |
| 875 | comp_compress__doc__}, |
| 876 | {"flush", (binaryfunc)PyZlib_flush, METH_VARARGS, |
| 877 | comp_flush__doc__}, |
| 878 | {NULL, NULL} |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 879 | }; |
| 880 | |
| 881 | static PyMethodDef Decomp_methods[] = |
| 882 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 883 | {"decompress", (binaryfunc)PyZlib_objdecompress, METH_VARARGS, |
| 884 | decomp_decompress__doc__}, |
| 885 | {"flush", (binaryfunc)PyZlib_unflush, METH_VARARGS, |
| 886 | decomp_flush__doc__}, |
| 887 | {NULL, NULL} |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 888 | }; |
| 889 | |
| 890 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 891 | Comp_getattr(compobject *self, char *name) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 892 | { |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 893 | /* No ENTER/LEAVE_ZLIB is necessary because this fn doesn't touch |
| 894 | internal data. */ |
| 895 | |
| 896 | return Py_FindMethod(comp_methods, (PyObject *)self, name); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 897 | } |
| 898 | |
| 899 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 900 | Decomp_getattr(compobject *self, char *name) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 901 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 902 | PyObject * retval; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 903 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 904 | ENTER_ZLIB |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 905 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 906 | if (strcmp(name, "unused_data") == 0) { |
| 907 | Py_INCREF(self->unused_data); |
| 908 | retval = self->unused_data; |
| 909 | } else if (strcmp(name, "unconsumed_tail") == 0) { |
| 910 | Py_INCREF(self->unconsumed_tail); |
| 911 | retval = self->unconsumed_tail; |
| 912 | } else |
| 913 | retval = Py_FindMethod(Decomp_methods, (PyObject *)self, name); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 914 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 915 | LEAVE_ZLIB |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 916 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 917 | return retval; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 918 | } |
| 919 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 920 | static char adler32__doc__[] = |
| 921 | "adler32(string) -- Compute an Adler-32 checksum of string, using " |
| 922 | "a default starting value, and returning an integer value.\n" |
| 923 | "adler32(string, value) -- Compute an Adler-32 checksum of string, using " |
| 924 | "the starting value provided, and returning an integer value\n" |
| 925 | ; |
| 926 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 927 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 928 | PyZlib_adler32(PyObject *self, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 929 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 930 | uLong adler32val = adler32(0L, Z_NULL, 0); |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 931 | Byte *buf; |
| 932 | int len; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 933 | |
Guido van Rossum | 43713e5 | 2000-02-29 13:59:29 +0000 | [diff] [blame] | 934 | if (!PyArg_ParseTuple(args, "s#|l:adler32", &buf, &len, &adler32val)) |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 935 | return NULL; |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 936 | adler32val = adler32(adler32val, buf, len); |
| 937 | return PyInt_FromLong(adler32val); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 938 | } |
| 939 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 940 | static char crc32__doc__[] = |
| 941 | "crc32(string) -- Compute a CRC-32 checksum of string, using " |
| 942 | "a default starting value, and returning an integer value.\n" |
| 943 | "crc32(string, value) -- Compute a CRC-32 checksum of string, using " |
| 944 | "the starting value provided, and returning an integer value.\n" |
| 945 | ; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 946 | |
| 947 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 948 | PyZlib_crc32(PyObject *self, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 949 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 950 | uLong crc32val = crc32(0L, Z_NULL, 0); |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 951 | Byte *buf; |
| 952 | int len; |
Guido van Rossum | 43713e5 | 2000-02-29 13:59:29 +0000 | [diff] [blame] | 953 | if (!PyArg_ParseTuple(args, "s#|l:crc32", &buf, &len, &crc32val)) |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 954 | return NULL; |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 955 | crc32val = crc32(crc32val, buf, len); |
| 956 | return PyInt_FromLong(crc32val); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 957 | } |
| 958 | |
| 959 | |
| 960 | static PyMethodDef zlib_methods[] = |
| 961 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 962 | {"adler32", (PyCFunction)PyZlib_adler32, METH_VARARGS, |
| 963 | adler32__doc__}, |
| 964 | {"compress", (PyCFunction)PyZlib_compress, METH_VARARGS, |
| 965 | compress__doc__}, |
| 966 | {"compressobj", (PyCFunction)PyZlib_compressobj, METH_VARARGS, |
| 967 | compressobj__doc__}, |
| 968 | {"crc32", (PyCFunction)PyZlib_crc32, METH_VARARGS, |
| 969 | crc32__doc__}, |
| 970 | {"decompress", (PyCFunction)PyZlib_decompress, METH_VARARGS, |
| 971 | decompress__doc__}, |
| 972 | {"decompressobj", (PyCFunction)PyZlib_decompressobj, METH_VARARGS, |
| 973 | decompressobj__doc__}, |
| 974 | {NULL, NULL} |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 975 | }; |
| 976 | |
| 977 | statichere PyTypeObject Comptype = { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 978 | PyObject_HEAD_INIT(0) |
| 979 | 0, |
| 980 | "Compress", |
| 981 | sizeof(compobject), |
| 982 | 0, |
| 983 | (destructor)Comp_dealloc, /*tp_dealloc*/ |
| 984 | 0, /*tp_print*/ |
| 985 | (getattrfunc)Comp_getattr, /*tp_getattr*/ |
| 986 | 0, /*tp_setattr*/ |
| 987 | 0, /*tp_compare*/ |
| 988 | 0, /*tp_repr*/ |
| 989 | 0, /*tp_as_number*/ |
| 990 | 0, /*tp_as_sequence*/ |
| 991 | 0, /*tp_as_mapping*/ |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 992 | }; |
| 993 | |
| 994 | statichere PyTypeObject Decomptype = { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 995 | PyObject_HEAD_INIT(0) |
| 996 | 0, |
| 997 | "Decompress", |
| 998 | sizeof(compobject), |
| 999 | 0, |
| 1000 | (destructor)Decomp_dealloc, /*tp_dealloc*/ |
| 1001 | 0, /*tp_print*/ |
| 1002 | (getattrfunc)Decomp_getattr, /*tp_getattr*/ |
| 1003 | 0, /*tp_setattr*/ |
| 1004 | 0, /*tp_compare*/ |
| 1005 | 0, /*tp_repr*/ |
| 1006 | 0, /*tp_as_number*/ |
| 1007 | 0, /*tp_as_sequence*/ |
| 1008 | 0, /*tp_as_mapping*/ |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 1009 | }; |
| 1010 | |
| 1011 | /* The following insint() routine was blatantly ripped off from |
| 1012 | socketmodule.c */ |
| 1013 | |
| 1014 | /* Convenience routine to export an integer value. |
| 1015 | For simplicity, errors (which are unlikely anyway) are ignored. */ |
| 1016 | static void |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 1017 | insint(PyObject *d, char *name, int value) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 1018 | { |
| 1019 | PyObject *v = PyInt_FromLong((long) value); |
| 1020 | if (v == NULL) { |
| 1021 | /* Don't bother reporting this error */ |
| 1022 | PyErr_Clear(); |
| 1023 | } |
| 1024 | else { |
| 1025 | PyDict_SetItemString(d, name, v); |
| 1026 | Py_DECREF(v); |
| 1027 | } |
| 1028 | } |
| 1029 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 1030 | static char zlib_module_documentation[]= |
| 1031 | "The functions in this module allow compression and decompression " |
| 1032 | "using the zlib library, which is based on GNU zip. \n\n" |
| 1033 | "adler32(string) -- Compute an Adler-32 checksum.\n" |
| 1034 | "adler32(string, start) -- Compute an Adler-32 checksum using a given starting value.\n" |
| 1035 | "compress(string) -- Compress a string.\n" |
| 1036 | "compress(string, level) -- Compress a string with the given level of compression (1--9).\n" |
| 1037 | "compressobj([level]) -- Return a compressor object.\n" |
| 1038 | "crc32(string) -- Compute a CRC-32 checksum.\n" |
| 1039 | "crc32(string, start) -- Compute a CRC-32 checksum using a given starting value.\n" |
Andrew M. Kuchling | 313a3e3 | 1999-12-20 22:13:38 +0000 | [diff] [blame] | 1040 | "decompress(string,[wbits],[bufsize]) -- Decompresses a compressed string.\n" |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 1041 | "decompressobj([wbits]) -- Return a decompressor object (wbits=window buffer size).\n\n" |
| 1042 | "Compressor objects support compress() and flush() methods; decompressor \n" |
| 1043 | "objects support decompress() and flush()." |
| 1044 | ; |
| 1045 | |
Guido van Rossum | 3886bb6 | 1998-12-04 18:50:17 +0000 | [diff] [blame] | 1046 | DL_EXPORT(void) |
Thomas Wouters | f3f33dc | 2000-07-21 06:00:07 +0000 | [diff] [blame] | 1047 | PyInit_zlib(void) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 1048 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 1049 | PyObject *m, *d, *ver; |
| 1050 | Comptype.ob_type = &PyType_Type; |
| 1051 | Decomptype.ob_type = &PyType_Type; |
| 1052 | m = Py_InitModule4("zlib", zlib_methods, |
| 1053 | zlib_module_documentation, |
| 1054 | (PyObject*)NULL,PYTHON_API_VERSION); |
| 1055 | d = PyModule_GetDict(m); |
| 1056 | ZlibError = PyErr_NewException("zlib.error", NULL, NULL); |
| 1057 | if (ZlibError != NULL) |
| 1058 | PyDict_SetItemString(d, "error", ZlibError); |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 1059 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 1060 | PyModule_AddIntConstant(m, "MAX_WBITS", MAX_WBITS); |
| 1061 | PyModule_AddIntConstant(m, "DEFLATED", DEFLATED); |
| 1062 | PyModule_AddIntConstant(m, "DEF_MEM_LEVEL", DEF_MEM_LEVEL); |
| 1063 | PyModule_AddIntConstant(m, "Z_BEST_SPEED", Z_BEST_SPEED); |
| 1064 | PyModule_AddIntConstant(m, "Z_BEST_COMPRESSION", Z_BEST_COMPRESSION); |
| 1065 | PyModule_AddIntConstant(m, "Z_DEFAULT_COMPRESSION", Z_DEFAULT_COMPRESSION); |
| 1066 | PyModule_AddIntConstant(m, "Z_FILTERED", Z_FILTERED); |
| 1067 | PyModule_AddIntConstant(m, "Z_HUFFMAN_ONLY", Z_HUFFMAN_ONLY); |
| 1068 | PyModule_AddIntConstant(m, "Z_DEFAULT_STRATEGY", Z_DEFAULT_STRATEGY); |
| 1069 | |
| 1070 | PyModule_AddIntConstant(m, "Z_FINISH", Z_FINISH); |
| 1071 | PyModule_AddIntConstant(m, "Z_NO_FLUSH", Z_NO_FLUSH); |
| 1072 | PyModule_AddIntConstant(m, "Z_SYNC_FLUSH", Z_SYNC_FLUSH); |
| 1073 | PyModule_AddIntConstant(m, "Z_FULL_FLUSH", Z_FULL_FLUSH); |
| 1074 | |
| 1075 | ver = PyString_FromString(ZLIB_VERSION); |
| 1076 | if (ver != NULL) { |
| 1077 | PyDict_SetItemString(d, "ZLIB_VERSION", ver); |
| 1078 | Py_DECREF(ver); |
| 1079 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 1080 | |
| 1081 | #ifdef WITH_THREAD |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 1082 | zlib_lock = PyThread_allocate_lock(); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 1083 | #endif // WITH_THREAD |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 1084 | } |