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 | |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 26 | N.B. |
| 27 | |
| 28 | Since ENTER_ZLIB and LEAVE_ZLIB only need to be called on functions |
| 29 | that modify the components of preexisting de/compress objects, it |
| 30 | could prove to be a performance gain on multiprocessor machines if |
| 31 | there was an de/compress object-specific lock. However, for the |
| 32 | moment the ENTER_ZLIB and LEAVE_ZLIB calls are global for ALL |
| 33 | de/compress objects. |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 34 | */ |
| 35 | |
| 36 | static PyThread_type_lock zlib_lock = NULL; /* initialized on module load */ |
| 37 | |
| 38 | #define ENTER_ZLIB \ |
Tim Peters | 6605c64 | 2001-10-17 03:43:54 +0000 | [diff] [blame^] | 39 | Py_BEGIN_ALLOW_THREADS \ |
| 40 | PyThread_acquire_lock(zlib_lock, 1); \ |
| 41 | Py_END_ALLOW_THREADS |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 42 | |
| 43 | #define LEAVE_ZLIB \ |
Tim Peters | 6605c64 | 2001-10-17 03:43:54 +0000 | [diff] [blame^] | 44 | PyThread_release_lock(zlib_lock); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 45 | |
| 46 | #else |
| 47 | |
| 48 | #define ENTER_ZLIB |
| 49 | #define LEAVE_ZLIB |
| 50 | |
| 51 | #endif |
| 52 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 53 | /* The following parameters are copied from zutil.h, version 0.95 */ |
| 54 | #define DEFLATED 8 |
| 55 | #if MAX_MEM_LEVEL >= 8 |
| 56 | # define DEF_MEM_LEVEL 8 |
| 57 | #else |
| 58 | # define DEF_MEM_LEVEL MAX_MEM_LEVEL |
| 59 | #endif |
| 60 | #define DEF_WBITS MAX_WBITS |
| 61 | |
Guido van Rossum | b729a1d | 1999-04-07 20:23:17 +0000 | [diff] [blame] | 62 | /* The output buffer will be increased in chunks of DEFAULTALLOC bytes. */ |
| 63 | #define DEFAULTALLOC (16*1024) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 64 | #define PyInit_zlib initzlib |
| 65 | |
| 66 | staticforward PyTypeObject Comptype; |
| 67 | staticforward PyTypeObject Decomptype; |
| 68 | |
| 69 | static PyObject *ZlibError; |
| 70 | |
| 71 | typedef struct |
| 72 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 73 | PyObject_HEAD |
| 74 | z_stream zst; |
| 75 | PyObject *unused_data; |
| 76 | PyObject *unconsumed_tail; |
| 77 | int is_initialised; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 78 | } compobject; |
| 79 | |
Jeremy Hylton | 0965e08 | 2001-10-16 21:56:09 +0000 | [diff] [blame] | 80 | static void |
| 81 | zlib_error(z_stream zst, int err, char *msg) |
| 82 | { |
| 83 | if (zst.msg == Z_NULL) |
| 84 | PyErr_Format(ZlibError, "Error %d %s", err, msg); |
| 85 | else |
| 86 | PyErr_Format(ZlibError, "Error %d %s: %.200s", err, msg, zst.msg); |
| 87 | } |
| 88 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 89 | static char compressobj__doc__[] = |
| 90 | "compressobj() -- Return a compressor object.\n" |
| 91 | "compressobj(level) -- Return a compressor object, using the given compression level.\n" |
| 92 | ; |
| 93 | |
| 94 | static char decompressobj__doc__[] = |
| 95 | "decompressobj() -- Return a decompressor object.\n" |
| 96 | "decompressobj(wbits) -- Return a decompressor object, setting the window buffer size to wbits.\n" |
| 97 | ; |
| 98 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 99 | static compobject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 100 | newcompobject(PyTypeObject *type) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 101 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 102 | compobject *self; |
| 103 | self = PyObject_New(compobject, type); |
| 104 | if (self == NULL) |
| 105 | return NULL; |
| 106 | self->is_initialised = 0; |
| 107 | self->unused_data = PyString_FromString(""); |
| 108 | if (self->unused_data == NULL) { |
| 109 | Py_DECREF(self); |
| 110 | return NULL; |
| 111 | } |
| 112 | self->unconsumed_tail = PyString_FromString(""); |
| 113 | if (self->unconsumed_tail == NULL) { |
| 114 | Py_DECREF(self); |
| 115 | return NULL; |
| 116 | } |
| 117 | return self; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 118 | } |
| 119 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 120 | static char compress__doc__[] = |
| 121 | "compress(string) -- Compress string using the default compression level, " |
| 122 | "returning a string containing compressed data.\n" |
| 123 | "compress(string, level) -- Compress string, using the chosen compression " |
| 124 | "level (from 1 to 9). Return a string containing the compressed data.\n" |
| 125 | ; |
| 126 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 127 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 128 | PyZlib_compress(PyObject *self, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 129 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 130 | PyObject *ReturnVal = NULL; |
| 131 | Byte *input, *output; |
| 132 | int length, level=Z_DEFAULT_COMPRESSION, err; |
| 133 | z_stream zst; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 134 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 135 | /* require Python string object, optional 'level' arg */ |
Jeremy Hylton | ba3dd99 | 2001-10-16 23:26:08 +0000 | [diff] [blame] | 136 | if (!PyArg_ParseTuple(args, "s#|i:compress", &input, &length, &level)) |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 137 | return NULL; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 138 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 139 | zst.avail_out = length + length/1000 + 12 + 1; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 140 | |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 141 | output = (Byte*)malloc(zst.avail_out); |
| 142 | if (output == NULL) { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 143 | PyErr_SetString(PyExc_MemoryError, |
| 144 | "Can't allocate memory to compress data"); |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 145 | return NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 146 | } |
Jeremy Hylton | a37e244 | 1998-12-18 22:13:11 +0000 | [diff] [blame] | 147 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 148 | /* Past the point of no return. From here on out, we need to make sure |
| 149 | we clean up mallocs & INCREFs. */ |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 150 | |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 151 | zst.zalloc = (alloc_func)NULL; |
| 152 | zst.zfree = (free_func)Z_NULL; |
| 153 | zst.next_out = (Byte *)output; |
| 154 | zst.next_in = (Byte *)input; |
| 155 | zst.avail_in = length; |
| 156 | err = deflateInit(&zst, level); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 157 | |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 158 | switch(err) { |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 159 | case(Z_OK): |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 160 | break; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 161 | case(Z_MEM_ERROR): |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 162 | PyErr_SetString(PyExc_MemoryError, |
| 163 | "Out of memory while compressing data"); |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 164 | goto error; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 165 | case(Z_STREAM_ERROR): |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 166 | PyErr_SetString(ZlibError, |
| 167 | "Bad compression level"); |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 168 | goto error; |
Jeremy Hylton | 0965e08 | 2001-10-16 21:56:09 +0000 | [diff] [blame] | 169 | default: |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 170 | deflateEnd(&zst); |
Jeremy Hylton | 0965e08 | 2001-10-16 21:56:09 +0000 | [diff] [blame] | 171 | zlib_error(zst, err, "while compressing data"); |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 172 | goto error; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 173 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 174 | |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 175 | Py_BEGIN_ALLOW_THREADS; |
| 176 | err = deflate(&zst, Z_FINISH); |
| 177 | Py_END_ALLOW_THREADS; |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 178 | |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 179 | if (err != Z_STREAM_END) { |
| 180 | zlib_error(zst, err, "while compressing data"); |
| 181 | deflateEnd(&zst); |
| 182 | goto error; |
| 183 | } |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 184 | |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 185 | err=deflateEnd(&zst); |
| 186 | if (err == Z_OK) |
| 187 | ReturnVal = PyString_FromStringAndSize((char *)output, |
| 188 | zst.total_out); |
| 189 | else |
| 190 | zlib_error(zst, err, "while finishing compression"); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 191 | |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 192 | error: |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 193 | free(output); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 194 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 195 | return ReturnVal; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 196 | } |
| 197 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 198 | static char decompress__doc__[] = |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 199 | "decompress(string) -- Decompress the data in string, returning a string containing the decompressed data.\n" |
| 200 | "decompress(string, wbits) -- Decompress the data in string with a window buffer size of wbits.\n" |
| 201 | "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] | 202 | ; |
| 203 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 204 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 205 | PyZlib_decompress(PyObject *self, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 206 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 207 | PyObject *result_str; |
| 208 | Byte *input; |
| 209 | int length, err; |
| 210 | int wsize=DEF_WBITS, r_strlen=DEFAULTALLOC; |
| 211 | z_stream zst; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 212 | |
Jeremy Hylton | ba3dd99 | 2001-10-16 23:26:08 +0000 | [diff] [blame] | 213 | if (!PyArg_ParseTuple(args, "s#|ii:decompress", |
| 214 | &input, &length, &wsize, &r_strlen)) |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 215 | return NULL; |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 216 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 217 | if (r_strlen <= 0) |
| 218 | r_strlen = 1; |
Jeremy Hylton | a37e244 | 1998-12-18 22:13:11 +0000 | [diff] [blame] | 219 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 220 | zst.avail_in = length; |
| 221 | zst.avail_out = r_strlen; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 222 | |
Jeremy Hylton | 9bc9d66 | 2001-10-16 21:23:58 +0000 | [diff] [blame] | 223 | if (!(result_str = PyString_FromStringAndSize(NULL, r_strlen))) |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 224 | return NULL; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 225 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 226 | zst.zalloc = (alloc_func)NULL; |
| 227 | zst.zfree = (free_func)Z_NULL; |
Jeremy Hylton | ba3dd99 | 2001-10-16 23:26:08 +0000 | [diff] [blame] | 228 | zst.next_out = (Byte *)PyString_AS_STRING(result_str); |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 229 | zst.next_in = (Byte *)input; |
| 230 | err = inflateInit2(&zst, wsize); |
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 | switch(err) { |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 233 | case(Z_OK): |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 234 | break; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 235 | case(Z_MEM_ERROR): |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 236 | PyErr_SetString(PyExc_MemoryError, |
| 237 | "Out of memory while decompressing data"); |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 238 | goto error; |
Jeremy Hylton | 0965e08 | 2001-10-16 21:56:09 +0000 | [diff] [blame] | 239 | default: |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 240 | inflateEnd(&zst); |
Jeremy Hylton | 0965e08 | 2001-10-16 21:56:09 +0000 | [diff] [blame] | 241 | zlib_error(zst, err, "while preparing to decompress data"); |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 242 | goto error; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 243 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 244 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 245 | do { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 246 | Py_BEGIN_ALLOW_THREADS |
| 247 | err=inflate(&zst, Z_FINISH); |
| 248 | Py_END_ALLOW_THREADS |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 249 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 250 | switch(err) { |
| 251 | case(Z_STREAM_END): |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 252 | break; |
Guido van Rossum | 115f517 | 1998-04-23 20:22:11 +0000 | [diff] [blame] | 253 | case(Z_BUF_ERROR): |
Andrew M. Kuchling | d923831 | 2000-10-09 14:18:10 +0000 | [diff] [blame] | 254 | /* |
| 255 | * If there is at least 1 byte of room according to zst.avail_out |
| 256 | * and we get this error, assume that it means zlib cannot |
| 257 | * process the inflate call() due to an error in the data. |
| 258 | */ |
Jeremy Hylton | 0965e08 | 2001-10-16 21:56:09 +0000 | [diff] [blame] | 259 | if (zst.avail_out > 0) { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 260 | PyErr_Format(ZlibError, "Error %i while decompressing data", |
| 261 | err); |
| 262 | inflateEnd(&zst); |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 263 | goto error; |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 264 | } |
Andrew M. Kuchling | d923831 | 2000-10-09 14:18:10 +0000 | [diff] [blame] | 265 | /* fall through */ |
| 266 | case(Z_OK): |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 267 | /* need more memory */ |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 268 | if (_PyString_Resize(&result_str, r_strlen << 1) == -1) { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 269 | inflateEnd(&zst); |
| 270 | result_str = NULL; |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 271 | goto error; |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 272 | } |
Jeremy Hylton | ba3dd99 | 2001-10-16 23:26:08 +0000 | [diff] [blame] | 273 | zst.next_out = (unsigned char *)PyString_AS_STRING(result_str) \ |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 274 | + r_strlen; |
| 275 | zst.avail_out = r_strlen; |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 276 | r_strlen = r_strlen << 1; |
| 277 | break; |
Jeremy Hylton | 0965e08 | 2001-10-16 21:56:09 +0000 | [diff] [blame] | 278 | default: |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 279 | inflateEnd(&zst); |
Jeremy Hylton | 0965e08 | 2001-10-16 21:56:09 +0000 | [diff] [blame] | 280 | zlib_error(zst, err, "while decompressing data"); |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 281 | goto error; |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 282 | } |
| 283 | } while (err != Z_STREAM_END); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 284 | |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 285 | err = inflateEnd(&zst); |
| 286 | if (err != Z_OK) { |
| 287 | zlib_error(zst, err, "while finishing data decompression"); |
Jeremy Hylton | ba3dd99 | 2001-10-16 23:26:08 +0000 | [diff] [blame] | 288 | goto error; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 289 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 290 | |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 291 | _PyString_Resize(&result_str, zst.total_out); |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 292 | return result_str; |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 293 | |
| 294 | error: |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 295 | Py_XDECREF(result_str); |
| 296 | return NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 297 | } |
| 298 | |
| 299 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 300 | PyZlib_compressobj(PyObject *selfptr, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 301 | { |
Jeremy Hylton | 49900000 | 2001-10-16 21:59:35 +0000 | [diff] [blame] | 302 | compobject *self; |
| 303 | int level=Z_DEFAULT_COMPRESSION, method=DEFLATED; |
| 304 | int wbits=MAX_WBITS, memLevel=DEF_MEM_LEVEL, strategy=0, err; |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 305 | |
Jeremy Hylton | 49900000 | 2001-10-16 21:59:35 +0000 | [diff] [blame] | 306 | if (!PyArg_ParseTuple(args, "|iiiii:compressobj", &level, &method, &wbits, |
| 307 | &memLevel, &strategy)) |
| 308 | return NULL; |
Jeremy Hylton | 41b9f00 | 1997-08-13 23:19:55 +0000 | [diff] [blame] | 309 | |
Jeremy Hylton | 49900000 | 2001-10-16 21:59:35 +0000 | [diff] [blame] | 310 | self = newcompobject(&Comptype); |
| 311 | if (self==NULL) |
| 312 | return(NULL); |
| 313 | self->zst.zalloc = (alloc_func)NULL; |
| 314 | self->zst.zfree = (free_func)Z_NULL; |
| 315 | err = deflateInit2(&self->zst, level, method, wbits, memLevel, strategy); |
| 316 | switch(err) { |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 317 | case (Z_OK): |
Jeremy Hylton | 49900000 | 2001-10-16 21:59:35 +0000 | [diff] [blame] | 318 | self->is_initialised = 1; |
| 319 | return (PyObject*)self; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 320 | case (Z_MEM_ERROR): |
Jeremy Hylton | 49900000 | 2001-10-16 21:59:35 +0000 | [diff] [blame] | 321 | Py_DECREF(self); |
| 322 | PyErr_SetString(PyExc_MemoryError, |
| 323 | "Can't allocate memory for compression object"); |
| 324 | return NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 325 | case(Z_STREAM_ERROR): |
Jeremy Hylton | 49900000 | 2001-10-16 21:59:35 +0000 | [diff] [blame] | 326 | Py_DECREF(self); |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 327 | PyErr_SetString(PyExc_ValueError, "Invalid initialization option"); |
Jeremy Hylton | 49900000 | 2001-10-16 21:59:35 +0000 | [diff] [blame] | 328 | return NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 329 | default: |
Jeremy Hylton | 0965e08 | 2001-10-16 21:56:09 +0000 | [diff] [blame] | 330 | zlib_error(self->zst, err, "while creating compression object"); |
Andrew M. Kuchling | 1c7aaa2 | 1999-01-29 21:49:34 +0000 | [diff] [blame] | 331 | Py_DECREF(self); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 332 | return NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 333 | } |
| 334 | } |
| 335 | |
| 336 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 337 | PyZlib_decompressobj(PyObject *selfptr, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 338 | { |
Jeremy Hylton | 49900000 | 2001-10-16 21:59:35 +0000 | [diff] [blame] | 339 | int wbits=DEF_WBITS, err; |
| 340 | compobject *self; |
| 341 | if (!PyArg_ParseTuple(args, "|i:decompressobj", &wbits)) |
| 342 | return NULL; |
| 343 | |
| 344 | self = newcompobject(&Decomptype); |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 345 | if (self == NULL) |
Jeremy Hylton | 49900000 | 2001-10-16 21:59:35 +0000 | [diff] [blame] | 346 | return(NULL); |
| 347 | self->zst.zalloc = (alloc_func)NULL; |
| 348 | self->zst.zfree = (free_func)Z_NULL; |
| 349 | err = inflateInit2(&self->zst, wbits); |
| 350 | switch(err) { |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 351 | case (Z_OK): |
Jeremy Hylton | 49900000 | 2001-10-16 21:59:35 +0000 | [diff] [blame] | 352 | self->is_initialised = 1; |
| 353 | return (PyObject*)self; |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 354 | case(Z_STREAM_ERROR): |
Jeremy Hylton | 49900000 | 2001-10-16 21:59:35 +0000 | [diff] [blame] | 355 | Py_DECREF(self); |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 356 | PyErr_SetString(PyExc_ValueError, "Invalid initialization option"); |
Jeremy Hylton | 49900000 | 2001-10-16 21:59:35 +0000 | [diff] [blame] | 357 | return NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 358 | case (Z_MEM_ERROR): |
Jeremy Hylton | 49900000 | 2001-10-16 21:59:35 +0000 | [diff] [blame] | 359 | Py_DECREF(self); |
| 360 | PyErr_SetString(PyExc_MemoryError, |
| 361 | "Can't allocate memory for decompression object"); |
| 362 | return NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 363 | default: |
Jeremy Hylton | 0965e08 | 2001-10-16 21:56:09 +0000 | [diff] [blame] | 364 | zlib_error(self->zst, err, "while creating decompression object"); |
Andrew M. Kuchling | 1c7aaa2 | 1999-01-29 21:49:34 +0000 | [diff] [blame] | 365 | Py_DECREF(self); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 366 | return NULL; |
Jeremy Hylton | 49900000 | 2001-10-16 21:59:35 +0000 | [diff] [blame] | 367 | } |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 368 | } |
| 369 | |
| 370 | static void |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 371 | Comp_dealloc(compobject *self) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 372 | { |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 373 | ENTER_ZLIB |
| 374 | |
Andrew M. Kuchling | 1c7aaa2 | 1999-01-29 21:49:34 +0000 | [diff] [blame] | 375 | if (self->is_initialised) |
Jeremy Hylton | 49900000 | 2001-10-16 21:59:35 +0000 | [diff] [blame] | 376 | deflateEnd(&self->zst); |
Andrew M. Kuchling | b95227d | 1999-03-25 21:21:08 +0000 | [diff] [blame] | 377 | Py_XDECREF(self->unused_data); |
Jeremy Hylton | 511e2ca | 2001-10-16 20:39:49 +0000 | [diff] [blame] | 378 | Py_XDECREF(self->unconsumed_tail); |
Guido van Rossum | b18618d | 2000-05-03 23:44:39 +0000 | [diff] [blame] | 379 | PyObject_Del(self); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 380 | |
| 381 | LEAVE_ZLIB |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 382 | } |
| 383 | |
| 384 | static void |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 385 | Decomp_dealloc(compobject *self) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 386 | { |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 387 | ENTER_ZLIB |
| 388 | |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 389 | if (self->is_initialised) |
Jeremy Hylton | 49900000 | 2001-10-16 21:59:35 +0000 | [diff] [blame] | 390 | inflateEnd(&self->zst); |
Andrew M. Kuchling | b95227d | 1999-03-25 21:21:08 +0000 | [diff] [blame] | 391 | Py_XDECREF(self->unused_data); |
Jeremy Hylton | 511e2ca | 2001-10-16 20:39:49 +0000 | [diff] [blame] | 392 | Py_XDECREF(self->unconsumed_tail); |
Guido van Rossum | b18618d | 2000-05-03 23:44:39 +0000 | [diff] [blame] | 393 | PyObject_Del(self); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 394 | |
| 395 | LEAVE_ZLIB |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 396 | } |
| 397 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 398 | static char comp_compress__doc__[] = |
| 399 | "compress(data) -- Return a string containing a compressed version of the data.\n\n" |
| 400 | "After calling this function, some of the input data may still\n" |
| 401 | "be stored in internal buffers for later processing.\n" |
| 402 | "Call the flush() method to clear these buffers." |
| 403 | ; |
| 404 | |
| 405 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 406 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 407 | PyZlib_objcompress(compobject *self, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 408 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 409 | int err, inplen, length = DEFAULTALLOC; |
| 410 | PyObject *RetVal; |
| 411 | Byte *input; |
| 412 | unsigned long start_total_out; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 413 | |
Jeremy Hylton | ba3dd99 | 2001-10-16 23:26:08 +0000 | [diff] [blame] | 414 | if (!PyArg_ParseTuple(args, "s#:compress", &input, &inplen)) |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 415 | return NULL; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 416 | |
Jeremy Hylton | 9bc9d66 | 2001-10-16 21:23:58 +0000 | [diff] [blame] | 417 | if (!(RetVal = PyString_FromStringAndSize(NULL, length))) |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 418 | return NULL; |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 419 | |
| 420 | ENTER_ZLIB |
| 421 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 422 | start_total_out = self->zst.total_out; |
| 423 | self->zst.avail_in = inplen; |
| 424 | self->zst.next_in = input; |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 425 | self->zst.avail_out = length; |
Jeremy Hylton | ba3dd99 | 2001-10-16 23:26:08 +0000 | [diff] [blame] | 426 | self->zst.next_out = (unsigned char *)PyString_AS_STRING(RetVal); |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 427 | |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 428 | Py_BEGIN_ALLOW_THREADS |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 429 | err = deflate(&(self->zst), Z_NO_FLUSH); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 430 | Py_END_ALLOW_THREADS |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 431 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 432 | /* while Z_OK and the output buffer is full, there might be more output, |
| 433 | so extend the output buffer and try again */ |
| 434 | while (err == Z_OK && self->zst.avail_out == 0) { |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 435 | if (_PyString_Resize(&RetVal, length << 1) == -1) { |
| 436 | RetVal = NULL; |
| 437 | goto error; |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 438 | } |
Jeremy Hylton | ba3dd99 | 2001-10-16 23:26:08 +0000 | [diff] [blame] | 439 | self->zst.next_out = (unsigned char *)PyString_AS_STRING(RetVal) \ |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 440 | + length; |
| 441 | self->zst.avail_out = length; |
| 442 | length = length << 1; |
| 443 | |
| 444 | Py_BEGIN_ALLOW_THREADS |
| 445 | err = deflate(&(self->zst), Z_NO_FLUSH); |
| 446 | Py_END_ALLOW_THREADS |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 447 | } |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 448 | /* We will only get Z_BUF_ERROR if the output buffer was full but |
| 449 | there wasn't more output when we tried again, so it is not an error |
| 450 | condition. |
| 451 | */ |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 452 | |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 453 | if (err != Z_OK && err != Z_BUF_ERROR) { |
| 454 | zlib_error(self->zst, err, "while compressing"); |
| 455 | Py_DECREF(RetVal); |
| 456 | RetVal = NULL; |
| 457 | goto error; |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 458 | } |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 459 | if (_PyString_Resize(&RetVal, |
| 460 | self->zst.total_out - start_total_out) < 0) |
| 461 | RetVal = NULL; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 462 | |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 463 | error: |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 464 | LEAVE_ZLIB |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 465 | return RetVal; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 466 | } |
| 467 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 468 | static char decomp_decompress__doc__[] = |
Jeremy Hylton | 511e2ca | 2001-10-16 20:39:49 +0000 | [diff] [blame] | 469 | "decompress(data, max_length) -- Return a string containing\n" |
| 470 | "the decompressed version of the data.\n\n" |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 471 | "After calling this function, some of the input data may still\n" |
| 472 | "be stored in internal buffers for later processing.\n" |
Jeremy Hylton | 511e2ca | 2001-10-16 20:39:49 +0000 | [diff] [blame] | 473 | "Call the flush() method to clear these buffers.\n" |
| 474 | "If the max_length parameter is specified then the return value will be\n" |
| 475 | "no longer than max_length. Unconsumed input data will be stored in\n" |
| 476 | "the unconsumed_tail attribute." |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 477 | ; |
| 478 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 479 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 480 | PyZlib_objdecompress(compobject *self, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 481 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 482 | int err, inplen, old_length, length = DEFAULTALLOC; |
| 483 | int max_length = 0; |
| 484 | PyObject *RetVal; |
| 485 | Byte *input; |
| 486 | unsigned long start_total_out; |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 487 | |
Jeremy Hylton | ba3dd99 | 2001-10-16 23:26:08 +0000 | [diff] [blame] | 488 | if (!PyArg_ParseTuple(args, "s#|i:decompress", &input, |
| 489 | &inplen, &max_length)) |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 490 | return NULL; |
| 491 | if (max_length < 0) { |
| 492 | PyErr_SetString(PyExc_ValueError, |
| 493 | "max_length must be greater than zero"); |
| 494 | return NULL; |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 495 | } |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 496 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 497 | /* limit amount of data allocated to max_length */ |
| 498 | if (max_length && length > max_length) |
| 499 | length = max_length; |
Jeremy Hylton | 9bc9d66 | 2001-10-16 21:23:58 +0000 | [diff] [blame] | 500 | if (!(RetVal = PyString_FromStringAndSize(NULL, length))) |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 501 | return NULL; |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 502 | |
| 503 | ENTER_ZLIB |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 504 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 505 | start_total_out = self->zst.total_out; |
| 506 | self->zst.avail_in = inplen; |
| 507 | self->zst.next_in = input; |
| 508 | self->zst.avail_out = length; |
Jeremy Hylton | ba3dd99 | 2001-10-16 23:26:08 +0000 | [diff] [blame] | 509 | self->zst.next_out = (unsigned char *)PyString_AS_STRING(RetVal); |
Jeremy Hylton | 511e2ca | 2001-10-16 20:39:49 +0000 | [diff] [blame] | 510 | |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 511 | Py_BEGIN_ALLOW_THREADS |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 512 | err = inflate(&(self->zst), Z_SYNC_FLUSH); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 513 | Py_END_ALLOW_THREADS |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 514 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 515 | /* While Z_OK and the output buffer is full, there might be more output. |
| 516 | So extend the output buffer and try again. |
| 517 | */ |
| 518 | while (err == Z_OK && self->zst.avail_out == 0) { |
| 519 | /* If max_length set, don't continue decompressing if we've already |
| 520 | reached the limit. |
| 521 | */ |
| 522 | if (max_length && length >= max_length) |
| 523 | break; |
Jeremy Hylton | 511e2ca | 2001-10-16 20:39:49 +0000 | [diff] [blame] | 524 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 525 | /* otherwise, ... */ |
| 526 | old_length = length; |
| 527 | length = length << 1; |
| 528 | if (max_length && length > max_length) |
| 529 | length = max_length; |
| 530 | |
| 531 | if (_PyString_Resize(&RetVal, length) == -1) { |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 532 | RetVal = NULL; |
| 533 | goto error; |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 534 | } |
Jeremy Hylton | ba3dd99 | 2001-10-16 23:26:08 +0000 | [diff] [blame] | 535 | self->zst.next_out = (unsigned char *)PyString_AS_STRING(RetVal) \ |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 536 | + old_length; |
| 537 | self->zst.avail_out = length - old_length; |
| 538 | |
| 539 | Py_BEGIN_ALLOW_THREADS |
| 540 | err = inflate(&(self->zst), Z_SYNC_FLUSH); |
| 541 | Py_END_ALLOW_THREADS |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 542 | } |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 543 | |
| 544 | /* Not all of the compressed data could be accomodated in the output buffer |
| 545 | of specified size. Return the unconsumed tail in an attribute.*/ |
| 546 | if(max_length) { |
| 547 | Py_DECREF(self->unconsumed_tail); |
| 548 | self->unconsumed_tail = PyString_FromStringAndSize(self->zst.next_in, |
| 549 | self->zst.avail_in); |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 550 | if(!self->unconsumed_tail) { |
| 551 | Py_DECREF(RetVal); |
| 552 | RetVal = NULL; |
| 553 | goto error; |
| 554 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 555 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 556 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 557 | /* The end of the compressed data has been reached, so set the |
| 558 | unused_data attribute to a string containing the remainder of the |
| 559 | data in the string. Note that this is also a logical place to call |
| 560 | inflateEnd, but the old behaviour of only calling it on flush() is |
| 561 | preserved. |
| 562 | */ |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 563 | if (err == Z_STREAM_END) { |
| 564 | Py_XDECREF(self->unused_data); /* Free original empty string */ |
| 565 | self->unused_data = PyString_FromStringAndSize( |
| 566 | (char *)self->zst.next_in, self->zst.avail_in); |
| 567 | if (self->unused_data == NULL) { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 568 | Py_DECREF(RetVal); |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 569 | goto error; |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 570 | } |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 571 | /* We will only get Z_BUF_ERROR if the output buffer was full |
| 572 | but there wasn't more output when we tried again, so it is |
| 573 | not an error condition. |
| 574 | */ |
| 575 | } else if (err != Z_OK && err != Z_BUF_ERROR) { |
| 576 | zlib_error(self->zst, err, "while decompressing"); |
| 577 | Py_DECREF(RetVal); |
| 578 | RetVal = NULL; |
| 579 | goto error; |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 580 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 581 | |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 582 | if (_PyString_Resize(&RetVal, self->zst.total_out - start_total_out) < 0) |
| 583 | RetVal = NULL; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 584 | |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 585 | error: |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 586 | LEAVE_ZLIB |
| 587 | |
| 588 | return RetVal; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 589 | } |
| 590 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 591 | static char comp_flush__doc__[] = |
Jeremy Hylton | a37e244 | 1998-12-18 22:13:11 +0000 | [diff] [blame] | 592 | "flush( [mode] ) -- Return a string containing any remaining compressed data.\n" |
| 593 | "mode can be one of the constants Z_SYNC_FLUSH, Z_FULL_FLUSH, Z_FINISH; the \n" |
| 594 | "default value used when mode is not specified is Z_FINISH.\n" |
| 595 | "If mode == Z_FINISH, the compressor object can no longer be used after\n" |
| 596 | "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] | 597 | ; |
| 598 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 599 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 600 | PyZlib_flush(compobject *self, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 601 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 602 | int err, length = DEFAULTALLOC; |
| 603 | PyObject *RetVal; |
| 604 | int flushmode = Z_FINISH; |
| 605 | unsigned long start_total_out; |
Jeremy Hylton | a37e244 | 1998-12-18 22:13:11 +0000 | [diff] [blame] | 606 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 607 | if (!PyArg_ParseTuple(args, "|i:flush", &flushmode)) |
| 608 | return NULL; |
Jeremy Hylton | a37e244 | 1998-12-18 22:13:11 +0000 | [diff] [blame] | 609 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 610 | /* Flushing with Z_NO_FLUSH is a no-op, so there's no point in |
| 611 | doing any work at all; just return an empty string. */ |
| 612 | if (flushmode == Z_NO_FLUSH) { |
| 613 | return PyString_FromStringAndSize(NULL, 0); |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 614 | } |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 615 | |
Jeremy Hylton | 9bc9d66 | 2001-10-16 21:23:58 +0000 | [diff] [blame] | 616 | if (!(RetVal = PyString_FromStringAndSize(NULL, length))) |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 617 | return NULL; |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 618 | |
| 619 | ENTER_ZLIB |
| 620 | |
| 621 | start_total_out = self->zst.total_out; |
| 622 | self->zst.avail_in = 0; |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 623 | self->zst.avail_out = length; |
Jeremy Hylton | ba3dd99 | 2001-10-16 23:26:08 +0000 | [diff] [blame] | 624 | self->zst.next_out = (unsigned char *)PyString_AS_STRING(RetVal); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 625 | |
| 626 | Py_BEGIN_ALLOW_THREADS |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 627 | err = deflate(&(self->zst), flushmode); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 628 | Py_END_ALLOW_THREADS |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 629 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 630 | /* while Z_OK and the output buffer is full, there might be more output, |
| 631 | so extend the output buffer and try again */ |
| 632 | while (err == Z_OK && self->zst.avail_out == 0) { |
| 633 | if (_PyString_Resize(&RetVal, length << 1) == -1) { |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 634 | RetVal = NULL; |
| 635 | goto error; |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 636 | } |
Jeremy Hylton | ba3dd99 | 2001-10-16 23:26:08 +0000 | [diff] [blame] | 637 | self->zst.next_out = (unsigned char *)PyString_AS_STRING(RetVal) \ |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 638 | + length; |
| 639 | self->zst.avail_out = length; |
| 640 | length = length << 1; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 641 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 642 | Py_BEGIN_ALLOW_THREADS |
| 643 | err = deflate(&(self->zst), flushmode); |
| 644 | Py_END_ALLOW_THREADS |
Jeremy Hylton | a37e244 | 1998-12-18 22:13:11 +0000 | [diff] [blame] | 645 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 646 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 647 | /* If flushmode is Z_FINISH, we also have to call deflateEnd() to free |
| 648 | various data structures. Note we should only get Z_STREAM_END when |
| 649 | flushmode is Z_FINISH, but checking both for safety*/ |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 650 | if (err == Z_STREAM_END && flushmode == Z_FINISH) { |
| 651 | err = deflateEnd(&(self->zst)); |
| 652 | if (err != Z_OK) { |
| 653 | zlib_error(self->zst, err, "from deflateEnd()"); |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 654 | Py_DECREF(RetVal); |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 655 | RetVal = NULL; |
| 656 | goto error; |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 657 | } |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 658 | else |
| 659 | self->is_initialised = 0; |
| 660 | |
| 661 | /* We will only get Z_BUF_ERROR if the output buffer was full |
| 662 | but there wasn't more output when we tried again, so it is |
| 663 | not an error condition. |
| 664 | */ |
| 665 | } else if (err!=Z_OK && err!=Z_BUF_ERROR) { |
| 666 | zlib_error(self->zst, err, "while flushing"); |
| 667 | Py_DECREF(RetVal); |
| 668 | RetVal = NULL; |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 669 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 670 | |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 671 | if (_PyString_Resize(&RetVal, self->zst.total_out - start_total_out) < 0) |
| 672 | RetVal = NULL; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 673 | |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 674 | error: |
| 675 | LEAVE_ZLIB; |
| 676 | |
| 677 | return RetVal; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 678 | } |
| 679 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 680 | static char decomp_flush__doc__[] = |
| 681 | "flush() -- Return a string containing any remaining decompressed data. " |
| 682 | "The decompressor object can no longer be used after this call." |
| 683 | ; |
| 684 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 685 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 686 | PyZlib_unflush(compobject *self, PyObject *args) |
Andrew M. Kuchling | 9aff4a2 | 2001-02-21 02:15:56 +0000 | [diff] [blame] | 687 | /*decompressor flush is a no-op because all pending data would have been |
| 688 | flushed by the decompress method. However, this routine previously called |
| 689 | inflateEnd, causing any further decompress or flush calls to raise |
| 690 | exceptions. This behaviour has been preserved.*/ |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 691 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 692 | int err; |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 693 | PyObject * retval = NULL; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 694 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 695 | if (!PyArg_ParseTuple(args, "")) |
| 696 | return NULL; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 697 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 698 | ENTER_ZLIB |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 699 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 700 | err = inflateEnd(&(self->zst)); |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 701 | if (err != Z_OK) |
Jeremy Hylton | 0965e08 | 2001-10-16 21:56:09 +0000 | [diff] [blame] | 702 | zlib_error(self->zst, err, "from inflateEnd()"); |
Jeremy Hylton | 9d620d0 | 2001-10-16 23:02:32 +0000 | [diff] [blame] | 703 | else { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 704 | self->is_initialised = 0; |
| 705 | retval = PyString_FromStringAndSize(NULL, 0); |
| 706 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 707 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 708 | LEAVE_ZLIB |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 709 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 710 | return retval; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 711 | } |
| 712 | |
| 713 | static PyMethodDef comp_methods[] = |
| 714 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 715 | {"compress", (binaryfunc)PyZlib_objcompress, METH_VARARGS, |
| 716 | comp_compress__doc__}, |
| 717 | {"flush", (binaryfunc)PyZlib_flush, METH_VARARGS, |
| 718 | comp_flush__doc__}, |
| 719 | {NULL, NULL} |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 720 | }; |
| 721 | |
| 722 | static PyMethodDef Decomp_methods[] = |
| 723 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 724 | {"decompress", (binaryfunc)PyZlib_objdecompress, METH_VARARGS, |
| 725 | decomp_decompress__doc__}, |
| 726 | {"flush", (binaryfunc)PyZlib_unflush, METH_VARARGS, |
| 727 | decomp_flush__doc__}, |
| 728 | {NULL, NULL} |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 729 | }; |
| 730 | |
| 731 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 732 | Comp_getattr(compobject *self, char *name) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 733 | { |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 734 | /* No ENTER/LEAVE_ZLIB is necessary because this fn doesn't touch |
| 735 | internal data. */ |
| 736 | |
| 737 | return Py_FindMethod(comp_methods, (PyObject *)self, name); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 738 | } |
| 739 | |
| 740 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 741 | Decomp_getattr(compobject *self, char *name) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 742 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 743 | PyObject * retval; |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 744 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 745 | ENTER_ZLIB |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 746 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 747 | if (strcmp(name, "unused_data") == 0) { |
| 748 | Py_INCREF(self->unused_data); |
| 749 | retval = self->unused_data; |
| 750 | } else if (strcmp(name, "unconsumed_tail") == 0) { |
| 751 | Py_INCREF(self->unconsumed_tail); |
| 752 | retval = self->unconsumed_tail; |
| 753 | } else |
| 754 | retval = Py_FindMethod(Decomp_methods, (PyObject *)self, name); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 755 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 756 | LEAVE_ZLIB |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 757 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 758 | return retval; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 759 | } |
| 760 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 761 | static char adler32__doc__[] = |
| 762 | "adler32(string) -- Compute an Adler-32 checksum of string, using " |
| 763 | "a default starting value, and returning an integer value.\n" |
| 764 | "adler32(string, value) -- Compute an Adler-32 checksum of string, using " |
| 765 | "the starting value provided, and returning an integer value\n" |
| 766 | ; |
| 767 | |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 768 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 769 | PyZlib_adler32(PyObject *self, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 770 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 771 | uLong adler32val = adler32(0L, Z_NULL, 0); |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 772 | Byte *buf; |
| 773 | int len; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 774 | |
Guido van Rossum | 43713e5 | 2000-02-29 13:59:29 +0000 | [diff] [blame] | 775 | if (!PyArg_ParseTuple(args, "s#|l:adler32", &buf, &len, &adler32val)) |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 776 | return NULL; |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 777 | adler32val = adler32(adler32val, buf, len); |
| 778 | return PyInt_FromLong(adler32val); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 779 | } |
| 780 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 781 | static char crc32__doc__[] = |
| 782 | "crc32(string) -- Compute a CRC-32 checksum of string, using " |
| 783 | "a default starting value, and returning an integer value.\n" |
| 784 | "crc32(string, value) -- Compute a CRC-32 checksum of string, using " |
| 785 | "the starting value provided, and returning an integer value.\n" |
| 786 | ; |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 787 | |
| 788 | static PyObject * |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 789 | PyZlib_crc32(PyObject *self, PyObject *args) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 790 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 791 | uLong crc32val = crc32(0L, Z_NULL, 0); |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 792 | Byte *buf; |
| 793 | int len; |
Guido van Rossum | 43713e5 | 2000-02-29 13:59:29 +0000 | [diff] [blame] | 794 | if (!PyArg_ParseTuple(args, "s#|l:crc32", &buf, &len, &crc32val)) |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 795 | return NULL; |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 796 | crc32val = crc32(crc32val, buf, len); |
| 797 | return PyInt_FromLong(crc32val); |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 798 | } |
| 799 | |
| 800 | |
| 801 | static PyMethodDef zlib_methods[] = |
| 802 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 803 | {"adler32", (PyCFunction)PyZlib_adler32, METH_VARARGS, |
| 804 | adler32__doc__}, |
| 805 | {"compress", (PyCFunction)PyZlib_compress, METH_VARARGS, |
| 806 | compress__doc__}, |
| 807 | {"compressobj", (PyCFunction)PyZlib_compressobj, METH_VARARGS, |
| 808 | compressobj__doc__}, |
| 809 | {"crc32", (PyCFunction)PyZlib_crc32, METH_VARARGS, |
| 810 | crc32__doc__}, |
| 811 | {"decompress", (PyCFunction)PyZlib_decompress, METH_VARARGS, |
| 812 | decompress__doc__}, |
| 813 | {"decompressobj", (PyCFunction)PyZlib_decompressobj, METH_VARARGS, |
| 814 | decompressobj__doc__}, |
| 815 | {NULL, NULL} |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 816 | }; |
| 817 | |
| 818 | statichere PyTypeObject Comptype = { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 819 | PyObject_HEAD_INIT(0) |
| 820 | 0, |
| 821 | "Compress", |
| 822 | sizeof(compobject), |
| 823 | 0, |
| 824 | (destructor)Comp_dealloc, /*tp_dealloc*/ |
| 825 | 0, /*tp_print*/ |
| 826 | (getattrfunc)Comp_getattr, /*tp_getattr*/ |
| 827 | 0, /*tp_setattr*/ |
| 828 | 0, /*tp_compare*/ |
| 829 | 0, /*tp_repr*/ |
| 830 | 0, /*tp_as_number*/ |
| 831 | 0, /*tp_as_sequence*/ |
| 832 | 0, /*tp_as_mapping*/ |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 833 | }; |
| 834 | |
| 835 | statichere PyTypeObject Decomptype = { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 836 | PyObject_HEAD_INIT(0) |
| 837 | 0, |
| 838 | "Decompress", |
| 839 | sizeof(compobject), |
| 840 | 0, |
| 841 | (destructor)Decomp_dealloc, /*tp_dealloc*/ |
| 842 | 0, /*tp_print*/ |
| 843 | (getattrfunc)Decomp_getattr, /*tp_getattr*/ |
| 844 | 0, /*tp_setattr*/ |
| 845 | 0, /*tp_compare*/ |
| 846 | 0, /*tp_repr*/ |
| 847 | 0, /*tp_as_number*/ |
| 848 | 0, /*tp_as_sequence*/ |
| 849 | 0, /*tp_as_mapping*/ |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 850 | }; |
| 851 | |
| 852 | /* The following insint() routine was blatantly ripped off from |
| 853 | socketmodule.c */ |
| 854 | |
| 855 | /* Convenience routine to export an integer value. |
| 856 | For simplicity, errors (which are unlikely anyway) are ignored. */ |
| 857 | static void |
Peter Schneider-Kamp | a788a7f | 2000-07-10 09:57:19 +0000 | [diff] [blame] | 858 | insint(PyObject *d, char *name, int value) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 859 | { |
| 860 | PyObject *v = PyInt_FromLong((long) value); |
| 861 | if (v == NULL) { |
| 862 | /* Don't bother reporting this error */ |
| 863 | PyErr_Clear(); |
| 864 | } |
| 865 | else { |
| 866 | PyDict_SetItemString(d, name, v); |
| 867 | Py_DECREF(v); |
| 868 | } |
| 869 | } |
| 870 | |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 871 | static char zlib_module_documentation[]= |
| 872 | "The functions in this module allow compression and decompression " |
| 873 | "using the zlib library, which is based on GNU zip. \n\n" |
| 874 | "adler32(string) -- Compute an Adler-32 checksum.\n" |
| 875 | "adler32(string, start) -- Compute an Adler-32 checksum using a given starting value.\n" |
| 876 | "compress(string) -- Compress a string.\n" |
| 877 | "compress(string, level) -- Compress a string with the given level of compression (1--9).\n" |
| 878 | "compressobj([level]) -- Return a compressor object.\n" |
| 879 | "crc32(string) -- Compute a CRC-32 checksum.\n" |
| 880 | "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] | 881 | "decompress(string,[wbits],[bufsize]) -- Decompresses a compressed string.\n" |
Guido van Rossum | 3c54030 | 1997-06-03 22:21:03 +0000 | [diff] [blame] | 882 | "decompressobj([wbits]) -- Return a decompressor object (wbits=window buffer size).\n\n" |
| 883 | "Compressor objects support compress() and flush() methods; decompressor \n" |
| 884 | "objects support decompress() and flush()." |
| 885 | ; |
| 886 | |
Guido van Rossum | 3886bb6 | 1998-12-04 18:50:17 +0000 | [diff] [blame] | 887 | DL_EXPORT(void) |
Thomas Wouters | f3f33dc | 2000-07-21 06:00:07 +0000 | [diff] [blame] | 888 | PyInit_zlib(void) |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 889 | { |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 890 | PyObject *m, *d, *ver; |
| 891 | Comptype.ob_type = &PyType_Type; |
| 892 | Decomptype.ob_type = &PyType_Type; |
| 893 | m = Py_InitModule4("zlib", zlib_methods, |
| 894 | zlib_module_documentation, |
| 895 | (PyObject*)NULL,PYTHON_API_VERSION); |
| 896 | d = PyModule_GetDict(m); |
| 897 | ZlibError = PyErr_NewException("zlib.error", NULL, NULL); |
| 898 | if (ZlibError != NULL) |
| 899 | PyDict_SetItemString(d, "error", ZlibError); |
Jeremy Hylton | cb91404 | 1997-09-04 23:39:23 +0000 | [diff] [blame] | 900 | |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 901 | PyModule_AddIntConstant(m, "MAX_WBITS", MAX_WBITS); |
| 902 | PyModule_AddIntConstant(m, "DEFLATED", DEFLATED); |
| 903 | PyModule_AddIntConstant(m, "DEF_MEM_LEVEL", DEF_MEM_LEVEL); |
| 904 | PyModule_AddIntConstant(m, "Z_BEST_SPEED", Z_BEST_SPEED); |
| 905 | PyModule_AddIntConstant(m, "Z_BEST_COMPRESSION", Z_BEST_COMPRESSION); |
| 906 | PyModule_AddIntConstant(m, "Z_DEFAULT_COMPRESSION", Z_DEFAULT_COMPRESSION); |
| 907 | PyModule_AddIntConstant(m, "Z_FILTERED", Z_FILTERED); |
| 908 | PyModule_AddIntConstant(m, "Z_HUFFMAN_ONLY", Z_HUFFMAN_ONLY); |
| 909 | PyModule_AddIntConstant(m, "Z_DEFAULT_STRATEGY", Z_DEFAULT_STRATEGY); |
| 910 | |
| 911 | PyModule_AddIntConstant(m, "Z_FINISH", Z_FINISH); |
| 912 | PyModule_AddIntConstant(m, "Z_NO_FLUSH", Z_NO_FLUSH); |
| 913 | PyModule_AddIntConstant(m, "Z_SYNC_FLUSH", Z_SYNC_FLUSH); |
| 914 | PyModule_AddIntConstant(m, "Z_FULL_FLUSH", Z_FULL_FLUSH); |
| 915 | |
| 916 | ver = PyString_FromString(ZLIB_VERSION); |
| 917 | if (ver != NULL) { |
| 918 | PyDict_SetItemString(d, "ZLIB_VERSION", ver); |
| 919 | Py_DECREF(ver); |
| 920 | } |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 921 | |
| 922 | #ifdef WITH_THREAD |
Jeremy Hylton | 9714f99 | 2001-10-16 21:19:45 +0000 | [diff] [blame] | 923 | zlib_lock = PyThread_allocate_lock(); |
Martin v. Löwis | 3bd8c1e | 2001-09-07 16:27:31 +0000 | [diff] [blame] | 924 | #endif // WITH_THREAD |
Guido van Rossum | fb22156 | 1997-04-29 15:38:09 +0000 | [diff] [blame] | 925 | } |