Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 1 | /* zlibmodule.c -- gzip-compatible data compression */ |
Mark Hammond | ae8c268 | 2001-01-31 10:28:03 +0000 | [diff] [blame] | 2 | /* See http://www.info-zip.org/pub/infozip/zlib/ */ |
| 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 | { |
| 78 | PyObject_HEAD |
| 79 | z_stream zst; |
Andrew M. Kuchling | b95227d | 1999-03-25 21:21:08 +0000 | [diff] [blame] | 80 | PyObject *unused_data; |
Andrew M. Kuchling | 1c7aaa2 | 1999-01-29 21:49:34 +0000 | [diff] [blame] | 81 | int is_initialised; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 82 | } compobject; |
| 83 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 84 | static char compressobj__doc__[] = |
| 85 | "compressobj() -- Return a compressor object.\n" |
| 86 | "compressobj(level) -- Return a compressor object, using the given compression level.\n" |
| 87 | ; |
| 88 | |
| 89 | static char decompressobj__doc__[] = |
| 90 | "decompressobj() -- Return a decompressor object.\n" |
| 91 | "decompressobj(wbits) -- Return a decompressor object, setting the window buffer size to wbits.\n" |
| 92 | ; |
| 93 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 94 | static compobject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 95 | newcompobject(PyTypeObject *type) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 96 | { |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 97 | compobject *self; |
Guido van Rossum | b18618d | 2000-05-03 23:44:39 +0000 | [diff] [blame] | 98 | self = PyObject_New(compobject, type); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 99 | if (self == NULL) |
| 100 | return NULL; |
Andrew M. Kuchling | 1c7aaa2 | 1999-01-29 21:49:34 +0000 | [diff] [blame] | 101 | self->is_initialised = 0; |
Andrew M. Kuchling | b95227d | 1999-03-25 21:21:08 +0000 | [diff] [blame] | 102 | self->unused_data = PyString_FromString(""); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 103 | return self; |
| 104 | } |
| 105 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 106 | static char compress__doc__[] = |
| 107 | "compress(string) -- Compress string using the default compression level, " |
| 108 | "returning a string containing compressed data.\n" |
| 109 | "compress(string, level) -- Compress string, using the chosen compression " |
| 110 | "level (from 1 to 9). Return a string containing the compressed data.\n" |
| 111 | ; |
| 112 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 113 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 114 | PyZlib_compress(PyObject *self, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 115 | { |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 116 | PyObject *ReturnVal = NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 117 | Byte *input, *output; |
| 118 | int length, level=Z_DEFAULT_COMPRESSION, err; |
| 119 | z_stream zst; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 120 | int return_error; |
| 121 | PyObject * inputString; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 122 | |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 123 | /* require Python string object, optional 'level' arg */ |
| 124 | if (!PyArg_ParseTuple(args, "S|i:compress", &inputString, &level)) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 125 | return NULL; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 126 | |
| 127 | /* now get a pointer to the internal string */ |
Martin v. Löwis | caef93d | 2001-09-08 16:23:34 +0000 | [diff] [blame] | 128 | if (PyString_AsStringAndSize(inputString, (char**)&input, &length) == -1) |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 129 | return NULL; |
| 130 | |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 131 | zst.avail_out = length + length/1000 + 12 + 1; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 132 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 133 | output=(Byte*)malloc(zst.avail_out); |
| 134 | if (output==NULL) |
| 135 | { |
| 136 | PyErr_SetString(PyExc_MemoryError, |
| 137 | "Can't allocate memory to compress data"); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 138 | free(output); |
| 139 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 140 | return NULL; |
| 141 | } |
Jeremy Hylton | a37e244 | 1998-12-18 22:13:11 +0000 | [diff] [blame] | 142 | |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 143 | /* Past the point of no return. From here on out, we need to make sure |
| 144 | we clean up mallocs & INCREFs. */ |
| 145 | |
| 146 | Py_INCREF(inputString); /* increment so that we hold ref */ |
| 147 | |
Jeremy Hylton | 5bc4abe | 1998-12-21 17:15:00 +0000 | [diff] [blame] | 148 | zst.zalloc=(alloc_func)NULL; |
Guido van Rossum | 97b5457 | 1997-06-03 22:21:47 +0000 | [diff] [blame] | 149 | zst.zfree=(free_func)Z_NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 150 | zst.next_out=(Byte *)output; |
| 151 | zst.next_in =(Byte *)input; |
| 152 | zst.avail_in=length; |
| 153 | err=deflateInit(&zst, level); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 154 | |
| 155 | return_error = 0; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 156 | switch(err) |
| 157 | { |
| 158 | case(Z_OK): |
| 159 | break; |
| 160 | case(Z_MEM_ERROR): |
| 161 | PyErr_SetString(PyExc_MemoryError, |
| 162 | "Out of memory while compressing data"); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 163 | return_error = 1; |
| 164 | break; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 165 | case(Z_STREAM_ERROR): |
| 166 | PyErr_SetString(ZlibError, |
| 167 | "Bad compression level"); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 168 | return_error = 1; |
| 169 | break; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 170 | default: |
| 171 | { |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 172 | if (zst.msg == Z_NULL) |
| 173 | PyErr_Format(ZlibError, "Error %i while compressing data", |
| 174 | err); |
| 175 | else |
| 176 | PyErr_Format(ZlibError, "Error %i while compressing data: %.200s", |
| 177 | err, zst.msg); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 178 | deflateEnd(&zst); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 179 | return_error = 1; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 180 | } |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 181 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 182 | |
| 183 | if (!return_error) { |
| 184 | Py_BEGIN_ALLOW_THREADS |
| 185 | err=deflate(&zst, Z_FINISH); |
| 186 | Py_END_ALLOW_THREADS |
| 187 | |
| 188 | switch(err) |
| 189 | { |
| 190 | case(Z_STREAM_END): |
| 191 | break; |
| 192 | /* Are there other errors to be trapped here? */ |
| 193 | default: |
| 194 | { |
| 195 | if (zst.msg == Z_NULL) |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 196 | PyErr_Format(ZlibError, "Error %i while compressing data", |
| 197 | err); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 198 | else |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 199 | PyErr_Format(ZlibError, "Error %i while compressing data: %.200s", |
| 200 | err, zst.msg); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 201 | |
| 202 | deflateEnd(&zst); |
| 203 | |
| 204 | return_error = 1; |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | if (!return_error) { |
| 209 | err=deflateEnd(&zst); |
| 210 | if (err == Z_OK) |
| 211 | ReturnVal = PyString_FromStringAndSize((char *)output, zst.total_out); |
| 212 | else { |
| 213 | { |
| 214 | if (zst.msg == Z_NULL) |
| 215 | PyErr_Format(ZlibError, "Error %i while finishing compression", |
| 216 | err); |
| 217 | else |
| 218 | PyErr_Format(ZlibError, |
| 219 | "Error %i while finishing compression: %.200s", |
| 220 | err, zst.msg); |
| 221 | } |
| 222 | } |
| 223 | |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 224 | } |
| 225 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 226 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 227 | free(output); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 228 | Py_DECREF(inputString); |
| 229 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 230 | return ReturnVal; |
| 231 | } |
| 232 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 233 | static char decompress__doc__[] = |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 234 | "decompress(string) -- Decompress the data in string, returning a string containing the decompressed data.\n" |
| 235 | "decompress(string, wbits) -- Decompress the data in string with a window buffer size of wbits.\n" |
| 236 | "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] | 237 | ; |
| 238 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 239 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 240 | PyZlib_decompress(PyObject *self, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 241 | { |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 242 | PyObject *result_str; |
| 243 | Byte *input; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 244 | int length, err; |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 245 | int wsize=DEF_WBITS, r_strlen=DEFAULTALLOC; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 246 | z_stream zst; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 247 | int return_error; |
| 248 | PyObject * inputString; |
| 249 | |
| 250 | if (!PyArg_ParseTuple(args, "S|ii:decompress", &inputString, &wsize, &r_strlen)) |
| 251 | return NULL; |
Martin v. Löwis | caef93d | 2001-09-08 16:23:34 +0000 | [diff] [blame] | 252 | if (PyString_AsStringAndSize(inputString, (char**)&input, &length) == -1) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 253 | return NULL; |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 254 | |
| 255 | if (r_strlen <= 0) |
| 256 | r_strlen = 1; |
Jeremy Hylton | a37e244 | 1998-12-18 22:13:11 +0000 | [diff] [blame] | 257 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 258 | zst.avail_in=length; |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 259 | zst.avail_out=r_strlen; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 260 | |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 261 | if (!(result_str = PyString_FromStringAndSize(NULL, r_strlen))) |
| 262 | { |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 263 | PyErr_SetString(PyExc_MemoryError, |
| 264 | "Can't allocate memory to decompress data"); |
| 265 | return NULL; |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 266 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 267 | |
| 268 | /* Past the point of no return. From here on out, we need to make sure |
| 269 | we clean up mallocs & INCREFs. */ |
| 270 | |
| 271 | Py_INCREF(inputString); /* increment so that we hold ref */ |
| 272 | |
Guido van Rossum | 97b5457 | 1997-06-03 22:21:47 +0000 | [diff] [blame] | 273 | zst.zalloc=(alloc_func)NULL; |
| 274 | zst.zfree=(free_func)Z_NULL; |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 275 | zst.next_out=(Byte *)PyString_AsString(result_str); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 276 | zst.next_in =(Byte *)input; |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 277 | err=inflateInit2(&zst, wsize); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 278 | |
| 279 | return_error = 0; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 280 | switch(err) |
| 281 | { |
| 282 | case(Z_OK): |
| 283 | break; |
| 284 | case(Z_MEM_ERROR): |
| 285 | PyErr_SetString(PyExc_MemoryError, |
| 286 | "Out of memory while decompressing data"); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 287 | return_error = 1; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 288 | default: |
| 289 | { |
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; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 300 | } |
| 301 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 302 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 303 | do |
| 304 | { |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 305 | if (return_error) |
| 306 | break; |
| 307 | |
| 308 | Py_BEGIN_ALLOW_THREADS |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 309 | err=inflate(&zst, Z_FINISH); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 310 | Py_END_ALLOW_THREADS |
| 311 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 312 | switch(err) |
| 313 | { |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 314 | case(Z_STREAM_END): |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 315 | break; |
Guido van Rossum | 115f517 | 1998-04-23 20:22:11 +0000 | [diff] [blame] | 316 | case(Z_BUF_ERROR): |
Andrew M. Kuchling | d923831 | 2000-10-09 14:18:10 +0000 | [diff] [blame] | 317 | /* |
| 318 | * If there is at least 1 byte of room according to zst.avail_out |
| 319 | * and we get this error, assume that it means zlib cannot |
| 320 | * process the inflate call() due to an error in the data. |
| 321 | */ |
| 322 | if (zst.avail_out > 0) |
| 323 | { |
| 324 | PyErr_Format(ZlibError, "Error %i while decompressing data", |
| 325 | err); |
| 326 | inflateEnd(&zst); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 327 | return_error = 1; |
| 328 | break; |
Andrew M. Kuchling | d923831 | 2000-10-09 14:18:10 +0000 | [diff] [blame] | 329 | } |
| 330 | /* fall through */ |
| 331 | case(Z_OK): |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 332 | /* need more memory */ |
| 333 | if (_PyString_Resize(&result_str, r_strlen << 1) == -1) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 334 | { |
| 335 | PyErr_SetString(PyExc_MemoryError, |
| 336 | "Out of memory while decompressing data"); |
| 337 | inflateEnd(&zst); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 338 | result_str = NULL; |
| 339 | return_error = 1; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 340 | } |
Guido van Rossum | ed2554a | 1997-08-18 15:31:24 +0000 | [diff] [blame] | 341 | zst.next_out = (unsigned char *)PyString_AsString(result_str) + r_strlen; |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 342 | zst.avail_out=r_strlen; |
| 343 | r_strlen = r_strlen << 1; |
| 344 | break; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 345 | default: |
| 346 | { |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 347 | if (zst.msg == Z_NULL) |
| 348 | PyErr_Format(ZlibError, "Error %i while decompressing data", |
| 349 | err); |
| 350 | else |
| 351 | PyErr_Format(ZlibError, |
| 352 | "Error %i while decompressing data: %.200s", |
| 353 | err, zst.msg); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 354 | inflateEnd(&zst); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 355 | return_error = 1; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 356 | } |
| 357 | } |
| 358 | } while(err!=Z_STREAM_END); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 359 | |
| 360 | if (!return_error) { |
| 361 | err=inflateEnd(&zst); |
| 362 | if (err!=Z_OK) |
| 363 | { |
| 364 | if (zst.msg == Z_NULL) |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 365 | PyErr_Format(ZlibError, |
| 366 | "Error %i while finishing data decompression", |
| 367 | err); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 368 | else |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 369 | PyErr_Format(ZlibError, |
| 370 | "Error %i while finishing data decompression: %.200s", |
| 371 | err, zst.msg); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 372 | |
| 373 | return_error = 1; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 374 | return NULL; |
| 375 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 376 | } |
| 377 | |
| 378 | if (!return_error) |
| 379 | _PyString_Resize(&result_str, zst.total_out); |
| 380 | else { |
| 381 | Py_XDECREF(result_str); /* sets result_str == NULL, if not already */ |
| 382 | } |
| 383 | Py_DECREF(inputString); |
| 384 | |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 385 | return result_str; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 386 | } |
| 387 | |
| 388 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 389 | PyZlib_compressobj(PyObject *selfptr, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 390 | { |
| 391 | compobject *self; |
| 392 | int level=Z_DEFAULT_COMPRESSION, method=DEFLATED; |
| 393 | int wbits=MAX_WBITS, memLevel=DEF_MEM_LEVEL, strategy=0, err; |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 394 | |
Guido van Rossum | 43713e5 | 2000-02-29 13:59:29 +0000 | [diff] [blame] | 395 | if (!PyArg_ParseTuple(args, "|iiiii:compressobj", &level, &method, &wbits, |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 396 | &memLevel, &strategy)) |
| 397 | return NULL; |
| 398 | |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 399 | self = newcompobject(&Comptype); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 400 | if (self==NULL) return(NULL); |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 401 | self->zst.zalloc = (alloc_func)NULL; |
| 402 | self->zst.zfree = (free_func)Z_NULL; |
| 403 | err = deflateInit2(&self->zst, level, method, wbits, memLevel, strategy); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 404 | switch(err) |
| 405 | { |
| 406 | case (Z_OK): |
Andrew M. Kuchling | 1c7aaa2 | 1999-01-29 21:49:34 +0000 | [diff] [blame] | 407 | self->is_initialised = 1; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 408 | return (PyObject*)self; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 409 | case (Z_MEM_ERROR): |
Andrew M. Kuchling | 1c7aaa2 | 1999-01-29 21:49:34 +0000 | [diff] [blame] | 410 | Py_DECREF(self); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 411 | PyErr_SetString(PyExc_MemoryError, |
| 412 | "Can't allocate memory for compression object"); |
| 413 | return NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 414 | case(Z_STREAM_ERROR): |
Andrew M. Kuchling | 1c7aaa2 | 1999-01-29 21:49:34 +0000 | [diff] [blame] | 415 | Py_DECREF(self); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 416 | PyErr_SetString(PyExc_ValueError, |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 417 | "Invalid initialization option"); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 418 | return NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 419 | default: |
| 420 | { |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 421 | if (self->zst.msg == Z_NULL) |
| 422 | PyErr_Format(ZlibError, |
| 423 | "Error %i while creating compression object", |
| 424 | err); |
| 425 | else |
| 426 | PyErr_Format(ZlibError, |
| 427 | "Error %i while creating compression object: %.200s", |
| 428 | err, self->zst.msg); |
Andrew M. Kuchling | 1c7aaa2 | 1999-01-29 21:49:34 +0000 | [diff] [blame] | 429 | Py_DECREF(self); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 430 | return NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 431 | } |
| 432 | } |
| 433 | } |
| 434 | |
| 435 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 436 | PyZlib_decompressobj(PyObject *selfptr, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 437 | { |
| 438 | int wbits=DEF_WBITS, err; |
| 439 | compobject *self; |
Guido van Rossum | 43713e5 | 2000-02-29 13:59:29 +0000 | [diff] [blame] | 440 | if (!PyArg_ParseTuple(args, "|i:decompressobj", &wbits)) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 441 | { |
| 442 | return NULL; |
| 443 | } |
| 444 | self=newcompobject(&Decomptype); |
| 445 | if (self==NULL) return(NULL); |
Guido van Rossum | 97b5457 | 1997-06-03 22:21:47 +0000 | [diff] [blame] | 446 | self->zst.zalloc=(alloc_func)NULL; |
| 447 | self->zst.zfree=(free_func)Z_NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 448 | err=inflateInit2(&self->zst, wbits); |
| 449 | switch(err) |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 450 | { |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 451 | case (Z_OK): |
Andrew M. Kuchling | 1c7aaa2 | 1999-01-29 21:49:34 +0000 | [diff] [blame] | 452 | self->is_initialised = 1; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 453 | return (PyObject*)self; |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 454 | case(Z_STREAM_ERROR): |
Andrew M. Kuchling | 1c7aaa2 | 1999-01-29 21:49:34 +0000 | [diff] [blame] | 455 | Py_DECREF(self); |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 456 | PyErr_SetString(PyExc_ValueError, |
| 457 | "Invalid initialization option"); |
| 458 | return NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 459 | case (Z_MEM_ERROR): |
Andrew M. Kuchling | 1c7aaa2 | 1999-01-29 21:49:34 +0000 | [diff] [blame] | 460 | Py_DECREF(self); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 461 | PyErr_SetString(PyExc_MemoryError, |
| 462 | "Can't allocate memory for decompression object"); |
| 463 | return NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 464 | default: |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 465 | { |
| 466 | if (self->zst.msg == Z_NULL) |
| 467 | PyErr_Format(ZlibError, |
| 468 | "Error %i while creating decompression object", |
| 469 | err); |
| 470 | else |
| 471 | PyErr_Format(ZlibError, |
| 472 | "Error %i while creating decompression object: %.200s", |
| 473 | err, self->zst.msg); |
Andrew M. Kuchling | 1c7aaa2 | 1999-01-29 21:49:34 +0000 | [diff] [blame] | 474 | Py_DECREF(self); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 475 | return NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 476 | } |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 477 | } |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 478 | } |
| 479 | |
| 480 | static void |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 481 | Comp_dealloc(compobject *self) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 482 | { |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 483 | ENTER_ZLIB |
| 484 | |
Andrew M. Kuchling | 1c7aaa2 | 1999-01-29 21:49:34 +0000 | [diff] [blame] | 485 | if (self->is_initialised) |
| 486 | deflateEnd(&self->zst); |
Andrew M. Kuchling | b95227d | 1999-03-25 21:21:08 +0000 | [diff] [blame] | 487 | Py_XDECREF(self->unused_data); |
Guido van Rossum | b18618d | 2000-05-03 23:44:39 +0000 | [diff] [blame] | 488 | PyObject_Del(self); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 489 | |
| 490 | LEAVE_ZLIB |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 491 | } |
| 492 | |
| 493 | static void |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 494 | Decomp_dealloc(compobject *self) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 495 | { |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 496 | ENTER_ZLIB |
| 497 | |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 498 | if (self->is_initialised) |
| 499 | inflateEnd(&self->zst); |
Andrew M. Kuchling | b95227d | 1999-03-25 21:21:08 +0000 | [diff] [blame] | 500 | Py_XDECREF(self->unused_data); |
Guido van Rossum | b18618d | 2000-05-03 23:44:39 +0000 | [diff] [blame] | 501 | PyObject_Del(self); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 502 | |
| 503 | LEAVE_ZLIB |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 504 | } |
| 505 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 506 | static char comp_compress__doc__[] = |
| 507 | "compress(data) -- Return a string containing a compressed version of the data.\n\n" |
| 508 | "After calling this function, some of the input data may still\n" |
| 509 | "be stored in internal buffers for later processing.\n" |
| 510 | "Call the flush() method to clear these buffers." |
| 511 | ; |
| 512 | |
| 513 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 514 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 515 | PyZlib_objcompress(compobject *self, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 516 | { |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 517 | int err, inplen, length = DEFAULTALLOC; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 518 | PyObject *RetVal; |
| 519 | Byte *input; |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 520 | unsigned long start_total_out; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 521 | int return_error; |
| 522 | PyObject * inputString; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 523 | |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 524 | if (!PyArg_ParseTuple(args, "S:compress", &inputString)) |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 525 | return NULL; |
Martin v. Löwis | caef93d | 2001-09-08 16:23:34 +0000 | [diff] [blame] | 526 | if (PyString_AsStringAndSize(inputString, (char**)&input, &inplen) == -1) |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 527 | return NULL; |
| 528 | |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 529 | if (!(RetVal = PyString_FromStringAndSize(NULL, length))) { |
| 530 | PyErr_SetString(PyExc_MemoryError, |
| 531 | "Can't allocate memory to compress data"); |
| 532 | return NULL; |
| 533 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 534 | |
| 535 | ENTER_ZLIB |
| 536 | |
| 537 | Py_INCREF(inputString); |
| 538 | |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 539 | start_total_out = self->zst.total_out; |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 540 | self->zst.avail_in = inplen; |
| 541 | self->zst.next_in = input; |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 542 | self->zst.avail_out = length; |
| 543 | self->zst.next_out = (unsigned char *)PyString_AsString(RetVal); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 544 | |
| 545 | Py_BEGIN_ALLOW_THREADS |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 546 | err = deflate(&(self->zst), Z_NO_FLUSH); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 547 | Py_END_ALLOW_THREADS |
| 548 | |
| 549 | return_error = 0; |
| 550 | |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 551 | /* while Z_OK and the output buffer is full, there might be more output, |
| 552 | so extend the output buffer and try again */ |
| 553 | while (err == Z_OK && self->zst.avail_out == 0) { |
| 554 | if (_PyString_Resize(&RetVal, length << 1) == -1) { |
Jeremy Hylton | 644c17d | 1997-08-14 21:06:42 +0000 | [diff] [blame] | 555 | PyErr_SetString(PyExc_MemoryError, |
| 556 | "Can't allocate memory to compress data"); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 557 | return_error = 1; |
| 558 | break; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 559 | } |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 560 | self->zst.next_out = (unsigned char *)PyString_AsString(RetVal) + length; |
| 561 | self->zst.avail_out = length; |
| 562 | length = length << 1; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 563 | |
| 564 | Py_BEGIN_ALLOW_THREADS |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 565 | err = deflate(&(self->zst), Z_NO_FLUSH); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 566 | Py_END_ALLOW_THREADS |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 567 | } |
| 568 | /* We will only get Z_BUF_ERROR if the output buffer was full but there |
| 569 | wasn't more output when we tried again, so it is not an error condition */ |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 570 | |
| 571 | if (!return_error) { |
| 572 | if (err != Z_OK && err != Z_BUF_ERROR) { |
| 573 | if (self->zst.msg == Z_NULL) |
| 574 | PyErr_Format(ZlibError, "Error %i while compressing", |
| 575 | err); |
| 576 | else |
| 577 | PyErr_Format(ZlibError, "Error %i while compressing: %.200s", |
| 578 | err, self->zst.msg); |
| 579 | |
| 580 | return_error = 1; |
| 581 | Py_DECREF(RetVal); |
| 582 | } |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 583 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 584 | |
| 585 | if (return_error) |
| 586 | RetVal = NULL; /* should have been handled by DECREF */ |
| 587 | else |
| 588 | _PyString_Resize(&RetVal, self->zst.total_out - start_total_out); |
| 589 | |
| 590 | Py_DECREF(inputString); |
| 591 | |
| 592 | LEAVE_ZLIB |
| 593 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 594 | return RetVal; |
| 595 | } |
| 596 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 597 | static char decomp_decompress__doc__[] = |
| 598 | "decompress(data) -- Return a string containing the decompressed version of the data.\n\n" |
| 599 | "After calling this function, some of the input data may still\n" |
| 600 | "be stored in internal buffers for later processing.\n" |
| 601 | "Call the flush() method to clear these buffers." |
| 602 | ; |
| 603 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 604 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 605 | PyZlib_objdecompress(compobject *self, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 606 | { |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 607 | int err, inplen, length = DEFAULTALLOC; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 608 | PyObject *RetVal; |
| 609 | Byte *input; |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 610 | unsigned long start_total_out; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 611 | int return_error; |
| 612 | PyObject * inputString; |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 613 | |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 614 | if (!PyArg_ParseTuple(args, "S:decompress", &inputString)) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 615 | return NULL; |
Martin v. Löwis | caef93d | 2001-09-08 16:23:34 +0000 | [diff] [blame] | 616 | if (PyString_AsStringAndSize(inputString, (char**)&input, &inplen) == -1) |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 617 | return NULL; |
| 618 | |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 619 | if (!(RetVal = PyString_FromStringAndSize(NULL, length))) { |
| 620 | PyErr_SetString(PyExc_MemoryError, |
| 621 | "Can't allocate memory to compress data"); |
| 622 | return NULL; |
| 623 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 624 | |
| 625 | ENTER_ZLIB |
| 626 | return_error = 0; |
| 627 | |
| 628 | Py_INCREF(inputString); |
| 629 | |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 630 | start_total_out = self->zst.total_out; |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 631 | self->zst.avail_in = inplen; |
| 632 | self->zst.next_in = input; |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 633 | self->zst.avail_out = length; |
Guido van Rossum | ed2554a | 1997-08-18 15:31:24 +0000 | [diff] [blame] | 634 | self->zst.next_out = (unsigned char *)PyString_AsString(RetVal); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 635 | |
| 636 | Py_BEGIN_ALLOW_THREADS |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 637 | err = inflate(&(self->zst), Z_SYNC_FLUSH); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 638 | Py_END_ALLOW_THREADS |
| 639 | |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 640 | /* while Z_OK and the output buffer is full, there might be more output, |
| 641 | so extend the output buffer and try again */ |
| 642 | while (err == Z_OK && self->zst.avail_out == 0) { |
| 643 | if (_PyString_Resize(&RetVal, length << 1) == -1) { |
| 644 | PyErr_SetString(PyExc_MemoryError, |
| 645 | "Can't allocate memory to compress data"); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 646 | return_error = 1; |
| 647 | break; |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 648 | } |
| 649 | self->zst.next_out = (unsigned char *)PyString_AsString(RetVal) + length; |
| 650 | self->zst.avail_out = length; |
| 651 | length = length << 1; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 652 | Py_BEGIN_ALLOW_THREADS |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 653 | err = inflate(&(self->zst), Z_SYNC_FLUSH); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 654 | Py_END_ALLOW_THREADS |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 655 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 656 | |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 657 | /* The end of the compressed data has been reached, so set the unused_data |
| 658 | attribute to a string containing the remainder of the data in the string. |
| 659 | Note that this is also a logical place to call inflateEnd, but the old |
| 660 | behaviour of only calling it on flush() is preserved.*/ |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 661 | if (!return_error) { |
| 662 | if (err == Z_STREAM_END) { |
| 663 | Py_XDECREF(self->unused_data); /* Free the original, empty string */ |
| 664 | self->unused_data = PyString_FromStringAndSize((char *)self->zst.next_in, |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 665 | self->zst.avail_in); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 666 | if (self->unused_data == NULL) { |
| 667 | PyErr_SetString(PyExc_MemoryError, |
| 668 | "Can't allocate memory to unused_data"); |
| 669 | Py_DECREF(RetVal); |
| 670 | return_error = 1; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 671 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 672 | /* We will only get Z_BUF_ERROR if the output buffer was full but there |
| 673 | wasn't more output when we tried again, so it is not an error |
| 674 | condition */ |
| 675 | } else if (err != Z_OK && err != Z_BUF_ERROR) { |
| 676 | if (self->zst.msg == Z_NULL) |
| 677 | PyErr_Format(ZlibError, "Error %i while decompressing", |
| 678 | err); |
| 679 | else |
| 680 | PyErr_Format(ZlibError, "Error %i while decompressing: %.200s", |
| 681 | err, self->zst.msg); |
| 682 | Py_DECREF(RetVal); |
| 683 | return_error = 1; |
| 684 | } |
Andrew M. Kuchling | b95227d | 1999-03-25 21:21:08 +0000 | [diff] [blame] | 685 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 686 | |
| 687 | if (!return_error) { |
| 688 | _PyString_Resize(&RetVal, self->zst.total_out - start_total_out); |
| 689 | } |
| 690 | else |
| 691 | RetVal = NULL; /* should be handled by DECREF */ |
| 692 | |
| 693 | Py_DECREF(inputString); |
| 694 | |
| 695 | LEAVE_ZLIB |
| 696 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 697 | return RetVal; |
| 698 | } |
| 699 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 700 | static char comp_flush__doc__[] = |
Jeremy Hylton | a37e244 | 1998-12-18 22:13:11 +0000 | [diff] [blame] | 701 | "flush( [mode] ) -- Return a string containing any remaining compressed data.\n" |
| 702 | "mode can be one of the constants Z_SYNC_FLUSH, Z_FULL_FLUSH, Z_FINISH; the \n" |
| 703 | "default value used when mode is not specified is Z_FINISH.\n" |
| 704 | "If mode == Z_FINISH, the compressor object can no longer be used after\n" |
| 705 | "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] | 706 | ; |
| 707 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 708 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 709 | PyZlib_flush(compobject *self, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 710 | { |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 711 | int err, length=DEFAULTALLOC; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 712 | PyObject *RetVal; |
Jeremy Hylton | a37e244 | 1998-12-18 22:13:11 +0000 | [diff] [blame] | 713 | int flushmode = Z_FINISH; |
| 714 | unsigned long start_total_out; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 715 | int return_error; |
Jeremy Hylton | a37e244 | 1998-12-18 22:13:11 +0000 | [diff] [blame] | 716 | |
Guido van Rossum | 43713e5 | 2000-02-29 13:59:29 +0000 | [diff] [blame] | 717 | if (!PyArg_ParseTuple(args, "|i:flush", &flushmode)) |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 718 | return NULL; |
Jeremy Hylton | a37e244 | 1998-12-18 22:13:11 +0000 | [diff] [blame] | 719 | |
| 720 | /* Flushing with Z_NO_FLUSH is a no-op, so there's no point in |
| 721 | doing any work at all; just return an empty string. */ |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 722 | if (flushmode == Z_NO_FLUSH) { |
| 723 | return PyString_FromStringAndSize(NULL, 0); |
| 724 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 725 | |
Jeremy Hylton | 644c17d | 1997-08-14 21:06:42 +0000 | [diff] [blame] | 726 | if (!(RetVal = PyString_FromStringAndSize(NULL, length))) { |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 727 | PyErr_SetString(PyExc_MemoryError, |
| 728 | "Can't allocate memory to compress data"); |
| 729 | return NULL; |
| 730 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 731 | |
| 732 | ENTER_ZLIB |
| 733 | |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 734 | start_total_out = self->zst.total_out; |
| 735 | self->zst.avail_in = 0; |
| 736 | self->zst.avail_out = length; |
| 737 | self->zst.next_out = (unsigned char *)PyString_AsString(RetVal); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 738 | |
| 739 | Py_BEGIN_ALLOW_THREADS |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 740 | err = deflate(&(self->zst), flushmode); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 741 | Py_END_ALLOW_THREADS |
| 742 | |
| 743 | return_error = 0; |
| 744 | |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 745 | /* while Z_OK and the output buffer is full, there might be more output, |
| 746 | so extend the output buffer and try again */ |
| 747 | while (err == Z_OK && self->zst.avail_out == 0) { |
| 748 | if (_PyString_Resize(&RetVal, length << 1) == -1) { |
Jeremy Hylton | 644c17d | 1997-08-14 21:06:42 +0000 | [diff] [blame] | 749 | PyErr_SetString(PyExc_MemoryError, |
| 750 | "Can't allocate memory to compress data"); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 751 | return_error = 1; |
| 752 | break; |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 753 | } |
| 754 | self->zst.next_out = (unsigned char *)PyString_AsString(RetVal) + length; |
| 755 | self->zst.avail_out = length; |
| 756 | length = length << 1; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 757 | |
| 758 | Py_BEGIN_ALLOW_THREADS |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 759 | err = deflate(&(self->zst), flushmode); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 760 | Py_END_ALLOW_THREADS |
Jeremy Hylton | 644c17d | 1997-08-14 21:06:42 +0000 | [diff] [blame] | 761 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 762 | |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 763 | /* If flushmode is Z_FINISH, we also have to call deflateEnd() to free |
| 764 | various data structures. Note we should only get Z_STREAM_END when |
| 765 | flushmode is Z_FINISH, but checking both for safety*/ |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 766 | if (!return_error) { |
| 767 | if (err == Z_STREAM_END && flushmode == Z_FINISH) { |
| 768 | err=deflateEnd(&(self->zst)); |
| 769 | if (err!=Z_OK) { |
| 770 | if (self->zst.msg == Z_NULL) |
| 771 | PyErr_Format(ZlibError, "Error %i from deflateEnd()", |
| 772 | err); |
| 773 | else |
| 774 | PyErr_Format(ZlibError,"Error %i from deflateEnd(): %.200s", |
| 775 | err, self->zst.msg); |
| 776 | |
| 777 | Py_DECREF(RetVal); |
| 778 | return_error = 1; |
| 779 | } |
| 780 | else |
| 781 | self->is_initialised = 0; |
| 782 | |
| 783 | /* We will only get Z_BUF_ERROR if the output buffer was full but there |
| 784 | wasn't more output when we tried again, so it is not an error |
| 785 | condition */ |
| 786 | } else if (err!=Z_OK && err!=Z_BUF_ERROR) { |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 787 | if (self->zst.msg == Z_NULL) |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 788 | PyErr_Format(ZlibError, "Error %i while flushing", |
Jeremy Hylton | a37e244 | 1998-12-18 22:13:11 +0000 | [diff] [blame] | 789 | err); |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 790 | else |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 791 | PyErr_Format(ZlibError, "Error %i while flushing: %.200s", |
Jeremy Hylton | a37e244 | 1998-12-18 22:13:11 +0000 | [diff] [blame] | 792 | err, self->zst.msg); |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 793 | Py_DECREF(RetVal); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 794 | return_error = 1; |
Jeremy Hylton | a37e244 | 1998-12-18 22:13:11 +0000 | [diff] [blame] | 795 | } |
Jeremy Hylton | 644c17d | 1997-08-14 21:06:42 +0000 | [diff] [blame] | 796 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 797 | |
| 798 | if (!return_error) |
| 799 | _PyString_Resize(&RetVal, self->zst.total_out - start_total_out); |
| 800 | else |
| 801 | RetVal = NULL; /* should have been handled by DECREF */ |
| 802 | |
| 803 | LEAVE_ZLIB |
| 804 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 805 | return RetVal; |
| 806 | } |
| 807 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 808 | static char decomp_flush__doc__[] = |
| 809 | "flush() -- Return a string containing any remaining decompressed data. " |
| 810 | "The decompressor object can no longer be used after this call." |
| 811 | ; |
| 812 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 813 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 814 | PyZlib_unflush(compobject *self, PyObject *args) |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 815 | /*decompressor flush is a no-op because all pending data would have been |
| 816 | flushed by the decompress method. However, this routine previously called |
| 817 | inflateEnd, causing any further decompress or flush calls to raise |
| 818 | exceptions. This behaviour has been preserved.*/ |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 819 | { |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 820 | int err; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 821 | PyObject * retval; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 822 | |
Andrew M. Kuchling | 14f5158 | 2000-08-03 02:04:05 +0000 | [diff] [blame] | 823 | if (!PyArg_ParseTuple(args, "")) |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 824 | return NULL; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 825 | |
| 826 | ENTER_ZLIB |
| 827 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 828 | err=inflateEnd(&(self->zst)); |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 829 | if (err!=Z_OK) { |
| 830 | if (self->zst.msg == Z_NULL) |
| 831 | PyErr_Format(ZlibError, "Error %i from inflateEnd()", |
| 832 | err); |
| 833 | else |
| 834 | PyErr_Format(ZlibError, "Error %i from inflateEnd(): %.200s", |
| 835 | err, self->zst.msg); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 836 | |
| 837 | retval = NULL; |
| 838 | |
| 839 | } else { |
| 840 | self->is_initialised = 0; |
| 841 | retval = PyString_FromStringAndSize(NULL, 0); |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 842 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 843 | |
| 844 | LEAVE_ZLIB |
| 845 | |
| 846 | return retval; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 847 | } |
| 848 | |
| 849 | static PyMethodDef comp_methods[] = |
| 850 | { |
Andrew M. Kuchling | 14f5158 | 2000-08-03 02:04:05 +0000 | [diff] [blame] | 851 | {"compress", (binaryfunc)PyZlib_objcompress, |
| 852 | METH_VARARGS, comp_compress__doc__}, |
| 853 | {"flush", (binaryfunc)PyZlib_flush, |
| 854 | METH_VARARGS, comp_flush__doc__}, |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 855 | {NULL, NULL} |
| 856 | }; |
| 857 | |
| 858 | static PyMethodDef Decomp_methods[] = |
| 859 | { |
Andrew M. Kuchling | 14f5158 | 2000-08-03 02:04:05 +0000 | [diff] [blame] | 860 | {"decompress", (binaryfunc)PyZlib_objdecompress, |
| 861 | METH_VARARGS, decomp_decompress__doc__}, |
| 862 | {"flush", (binaryfunc)PyZlib_unflush, |
| 863 | METH_VARARGS, decomp_flush__doc__}, |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 864 | {NULL, NULL} |
| 865 | }; |
| 866 | |
| 867 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 868 | Comp_getattr(compobject *self, char *name) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 869 | { |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 870 | /* No ENTER/LEAVE_ZLIB is necessary because this fn doesn't touch |
| 871 | internal data. */ |
| 872 | |
| 873 | return Py_FindMethod(comp_methods, (PyObject *)self, name); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 874 | } |
| 875 | |
| 876 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 877 | Decomp_getattr(compobject *self, char *name) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 878 | { |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 879 | PyObject * retval; |
| 880 | |
| 881 | ENTER_ZLIB |
| 882 | |
Andrew M. Kuchling | b95227d | 1999-03-25 21:21:08 +0000 | [diff] [blame] | 883 | if (strcmp(name, "unused_data") == 0) |
| 884 | { |
| 885 | Py_INCREF(self->unused_data); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 886 | retval = self->unused_data; |
Andrew M. Kuchling | b95227d | 1999-03-25 21:21:08 +0000 | [diff] [blame] | 887 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 888 | else |
| 889 | retval = Py_FindMethod(Decomp_methods, (PyObject *)self, name); |
| 890 | |
| 891 | LEAVE_ZLIB |
| 892 | |
| 893 | return retval; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 894 | } |
| 895 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 896 | static char adler32__doc__[] = |
| 897 | "adler32(string) -- Compute an Adler-32 checksum of string, using " |
| 898 | "a default starting value, and returning an integer value.\n" |
| 899 | "adler32(string, value) -- Compute an Adler-32 checksum of string, using " |
| 900 | "the starting value provided, and returning an integer value\n" |
| 901 | ; |
| 902 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 903 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 904 | PyZlib_adler32(PyObject *self, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 905 | { |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 906 | uLong adler32val=adler32(0L, Z_NULL, 0); |
| 907 | Byte *buf; |
| 908 | int len; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 909 | |
Guido van Rossum | 43713e5 | 2000-02-29 13:59:29 +0000 | [diff] [blame] | 910 | if (!PyArg_ParseTuple(args, "s#|l:adler32", &buf, &len, &adler32val)) |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 911 | { |
| 912 | return NULL; |
| 913 | } |
| 914 | adler32val = adler32(adler32val, buf, len); |
| 915 | return PyInt_FromLong(adler32val); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 916 | } |
| 917 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 918 | static char crc32__doc__[] = |
| 919 | "crc32(string) -- Compute a CRC-32 checksum of string, using " |
| 920 | "a default starting value, and returning an integer value.\n" |
| 921 | "crc32(string, value) -- Compute a CRC-32 checksum of string, using " |
| 922 | "the starting value provided, and returning an integer value.\n" |
| 923 | ; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 924 | |
| 925 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 926 | PyZlib_crc32(PyObject *self, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 927 | { |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 928 | uLong crc32val=crc32(0L, Z_NULL, 0); |
| 929 | Byte *buf; |
| 930 | int len; |
Guido van Rossum | 43713e5 | 2000-02-29 13:59:29 +0000 | [diff] [blame] | 931 | if (!PyArg_ParseTuple(args, "s#|l:crc32", &buf, &len, &crc32val)) |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 932 | { |
| 933 | return NULL; |
| 934 | } |
| 935 | crc32val = crc32(crc32val, buf, len); |
| 936 | return PyInt_FromLong(crc32val); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 937 | } |
| 938 | |
| 939 | |
| 940 | static PyMethodDef zlib_methods[] = |
| 941 | { |
Andrew M. Kuchling | 14f5158 | 2000-08-03 02:04:05 +0000 | [diff] [blame] | 942 | {"adler32", (PyCFunction)PyZlib_adler32, |
| 943 | METH_VARARGS, adler32__doc__}, |
| 944 | {"compress", (PyCFunction)PyZlib_compress, |
| 945 | METH_VARARGS, compress__doc__}, |
| 946 | {"compressobj", (PyCFunction)PyZlib_compressobj, |
| 947 | METH_VARARGS, compressobj__doc__}, |
| 948 | {"crc32", (PyCFunction)PyZlib_crc32, |
| 949 | METH_VARARGS, crc32__doc__}, |
| 950 | {"decompress", (PyCFunction)PyZlib_decompress, |
| 951 | METH_VARARGS, decompress__doc__}, |
| 952 | {"decompressobj", (PyCFunction)PyZlib_decompressobj, |
| 953 | METH_VARARGS, decompressobj__doc__}, |
| 954 | {NULL, NULL} |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 955 | }; |
| 956 | |
| 957 | statichere PyTypeObject Comptype = { |
Guido van Rossum | 9ec0f8b | 1997-12-18 05:21:29 +0000 | [diff] [blame] | 958 | PyObject_HEAD_INIT(0) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 959 | 0, |
| 960 | "Compress", |
| 961 | sizeof(compobject), |
| 962 | 0, |
| 963 | (destructor)Comp_dealloc, /*tp_dealloc*/ |
| 964 | 0, /*tp_print*/ |
| 965 | (getattrfunc)Comp_getattr, /*tp_getattr*/ |
| 966 | 0, /*tp_setattr*/ |
| 967 | 0, /*tp_compare*/ |
| 968 | 0, /*tp_repr*/ |
| 969 | 0, /*tp_as_number*/ |
| 970 | 0, /*tp_as_sequence*/ |
| 971 | 0, /*tp_as_mapping*/ |
| 972 | }; |
| 973 | |
| 974 | statichere PyTypeObject Decomptype = { |
Guido van Rossum | 9ec0f8b | 1997-12-18 05:21:29 +0000 | [diff] [blame] | 975 | PyObject_HEAD_INIT(0) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 976 | 0, |
| 977 | "Decompress", |
| 978 | sizeof(compobject), |
| 979 | 0, |
| 980 | (destructor)Decomp_dealloc, /*tp_dealloc*/ |
| 981 | 0, /*tp_print*/ |
| 982 | (getattrfunc)Decomp_getattr, /*tp_getattr*/ |
| 983 | 0, /*tp_setattr*/ |
| 984 | 0, /*tp_compare*/ |
| 985 | 0, /*tp_repr*/ |
| 986 | 0, /*tp_as_number*/ |
| 987 | 0, /*tp_as_sequence*/ |
| 988 | 0, /*tp_as_mapping*/ |
| 989 | }; |
| 990 | |
| 991 | /* The following insint() routine was blatantly ripped off from |
| 992 | socketmodule.c */ |
| 993 | |
| 994 | /* Convenience routine to export an integer value. |
| 995 | For simplicity, errors (which are unlikely anyway) are ignored. */ |
| 996 | static void |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 997 | insint(PyObject *d, char *name, int value) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 998 | { |
| 999 | PyObject *v = PyInt_FromLong((long) value); |
| 1000 | if (v == NULL) { |
| 1001 | /* Don't bother reporting this error */ |
| 1002 | PyErr_Clear(); |
| 1003 | } |
| 1004 | else { |
| 1005 | PyDict_SetItemString(d, name, v); |
| 1006 | Py_DECREF(v); |
| 1007 | } |
| 1008 | } |
| 1009 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 1010 | static char zlib_module_documentation[]= |
| 1011 | "The functions in this module allow compression and decompression " |
| 1012 | "using the zlib library, which is based on GNU zip. \n\n" |
| 1013 | "adler32(string) -- Compute an Adler-32 checksum.\n" |
| 1014 | "adler32(string, start) -- Compute an Adler-32 checksum using a given starting value.\n" |
| 1015 | "compress(string) -- Compress a string.\n" |
| 1016 | "compress(string, level) -- Compress a string with the given level of compression (1--9).\n" |
| 1017 | "compressobj([level]) -- Return a compressor object.\n" |
| 1018 | "crc32(string) -- Compute a CRC-32 checksum.\n" |
| 1019 | "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] | 1020 | "decompress(string,[wbits],[bufsize]) -- Decompresses a compressed string.\n" |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 1021 | "decompressobj([wbits]) -- Return a decompressor object (wbits=window buffer size).\n\n" |
| 1022 | "Compressor objects support compress() and flush() methods; decompressor \n" |
| 1023 | "objects support decompress() and flush()." |
| 1024 | ; |
| 1025 | |
Guido van Rossum | 3886bb6 | 1998-12-04 18:50:17 +0000 | [diff] [blame] | 1026 | DL_EXPORT(void) |
Thomas Wouters | f3f33dc | 2000-07-21 06:00:07 +0000 | [diff] [blame] | 1027 | PyInit_zlib(void) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 1028 | { |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 1029 | PyObject *m, *d, *ver; |
Guido van Rossum | 9ec0f8b | 1997-12-18 05:21:29 +0000 | [diff] [blame] | 1030 | Comptype.ob_type = &PyType_Type; |
| 1031 | Decomptype.ob_type = &PyType_Type; |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 1032 | m = Py_InitModule4("zlib", zlib_methods, |
| 1033 | zlib_module_documentation, |
| 1034 | (PyObject*)NULL,PYTHON_API_VERSION); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 1035 | d = PyModule_GetDict(m); |
Guido van Rossum | 0cb96de | 1997-10-01 04:29:29 +0000 | [diff] [blame] | 1036 | ZlibError = PyErr_NewException("zlib.error", NULL, NULL); |
Fred Drake | 8972dfd | 1999-12-22 16:13:54 +0000 | [diff] [blame] | 1037 | if (ZlibError != NULL) |
| 1038 | PyDict_SetItemString(d, "error", ZlibError); |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 1039 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 1040 | insint(d, "MAX_WBITS", MAX_WBITS); |
| 1041 | insint(d, "DEFLATED", DEFLATED); |
| 1042 | insint(d, "DEF_MEM_LEVEL", DEF_MEM_LEVEL); |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 1043 | insint(d, "Z_BEST_SPEED", Z_BEST_SPEED); |
| 1044 | insint(d, "Z_BEST_COMPRESSION", Z_BEST_COMPRESSION); |
| 1045 | insint(d, "Z_DEFAULT_COMPRESSION", Z_DEFAULT_COMPRESSION); |
| 1046 | insint(d, "Z_FILTERED", Z_FILTERED); |
| 1047 | insint(d, "Z_HUFFMAN_ONLY", Z_HUFFMAN_ONLY); |
| 1048 | insint(d, "Z_DEFAULT_STRATEGY", Z_DEFAULT_STRATEGY); |
Jeremy Hylton | a37e244 | 1998-12-18 22:13:11 +0000 | [diff] [blame] | 1049 | |
| 1050 | insint(d, "Z_FINISH", Z_FINISH); |
| 1051 | insint(d, "Z_NO_FLUSH", Z_NO_FLUSH); |
| 1052 | insint(d, "Z_SYNC_FLUSH", Z_SYNC_FLUSH); |
| 1053 | insint(d, "Z_FULL_FLUSH", Z_FULL_FLUSH); |
| 1054 | |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 1055 | ver = PyString_FromString(ZLIB_VERSION); |
Fred Drake | 8972dfd | 1999-12-22 16:13:54 +0000 | [diff] [blame] | 1056 | if (ver != NULL) { |
| 1057 | PyDict_SetItemString(d, "ZLIB_VERSION", ver); |
| 1058 | Py_DECREF(ver); |
| 1059 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 1060 | |
| 1061 | #ifdef WITH_THREAD |
| 1062 | zlib_lock = PyThread_allocate_lock(); |
| 1063 | #endif // WITH_THREAD |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 1064 | } |