pike.git/src/modules/Gz/zlibmod.c:a7659b8c8d2a5f7c8eee4cbf6e7deabd01bf799f

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1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 /* || This file is part of Pike. For copyright information see COPYRIGHT. || Pike is distributed under GPL, LGPL and MPL. See the file COPYING || for more information. */ #include "module.h" #include "zlib_machine.h" #include "module_support.h" #if !defined(HAVE_LIBZ) && !defined(HAVE_LIBGZ) #undef HAVE_ZLIB_H #endif #ifdef HAVE_ZLIB_H #include "interpret.h" #include "pike_macros.h" #include "pike_types.h" #include "threads.h" #include "buffer.h" #include "operators.h" #include "bignum.h" #include <zlib.h> #define sp Pike_sp struct zipper { int level; int state; struct z_stream_s gz; struct pike_string *epilogue, *dict; #ifdef _REENTRANT DEFINE_MUTEX(lock); #endif /* _REENTRANT */ }; struct memobj { void *ptr; size_t len; int shift; }; #define BUF 32768 #define MAX_BUF (64*BUF) #undef THIS #define THIS ((struct zipper *)(Pike_fp->current_storage)) static struct program *deflate_program; /*! @module Gz *! *! The Gz module contains functions to compress and uncompress strings using *! the same algorithm as the program @tt{gzip@}. Compressing can be done in *! streaming mode or all at once. *! *! The Gz module consists of two classes; Gz.deflate and Gz.inflate. *! Gz.deflate is used to pack data *! and Gz.inflate is used to unpack data. (Think "inflatable boat") *! *! @note *! Note that this module is only available if the gzip library was *! available when Pike was compiled. *! *! Note that although these functions use the same @i{algorithm@} as *! @tt{gzip@}, they do not use the exact same format, so you cannot directly *! unzip gzipped files with these routines. Support for this will be *! added in the future. */ /*! @class deflate *! *! This class interfaces with the compression routines in the libz *! library. *! *! @note *! This class is only available if libz was available and found when *! Pike was compiled. *! *! @seealso *! @[Gz.inflate()], @[Gz.compress()], @[Gz.uncompress()] */ /*! @decl void create(int(-9..9)|void level, int|void strategy,@ *! int(8..15)|void window_size) *! @decl void create(mapping options) *! *! This function can also be used to re-initialize a Gz.deflate object *! so it can be re-used. *! *! If a mapping is passed as the only argument, it will accept the *! parameters described below as indices, and additionally it accepts *! a @expr{string@} as @expr{dictionary@}. *! *! @param level *! Indicates the level of effort spent to make the data compress *! well. Zero means no packing, 2-3 is considered 'fast', 6 is *! default and higher is considered 'slow' but gives better *! packing. *! *! If the argument is negative, no headers will be emitted. This is *! needed to produce ZIP-files, as an example. The negative value *! is then negated, and handled as a positive value. *! *! @param strategy *! The strategy to be used when compressing the data. One of the *! following. *! @int *! @value DEFAULT_STRATEGY *! The default strategy as selected in the zlib library. *! @value FILTERED *! This strategy is intented for data created by a filter or *! predictor and will put more emphasis on huffman encoding and *! less on LZ string matching. This is between DEFAULT_STRATEGY *! and HUFFMAN_ONLY. *! @value RLE *! This strategy is even closer to the HUFFMAN_ONLY in that it *! only looks at the latest byte in the window, i.e. a window *! size of 1 byte is sufficient for decompression. This mode is *! not available in all zlib versions. *! @value HUFFMAN_ONLY *! This strategy will turn of string matching completely, only *! doing huffman encoding. Window size doesn't matter in this *! mode and the data can be decompressed with a zero size window. *! @value FIXED *! In this mode dynamic huffman codes are disabled, allowing for *! a simpler decoder for special applications. This mode is not *! available in all zlib versions. *! @endint *! *! @param window_size *! Defines the size of the LZ77 window from 256 bytes to 32768 *! bytes, expressed as 2^x. */ static void gz_deflate_create(INT32 args) { int tmp, wbits = 15; int strategy = Z_DEFAULT_STRATEGY; THIS->level=Z_DEFAULT_COMPRESSION; if(THIS->gz.state) { /* mt_lock(& THIS->lock); */ deflateEnd(&THIS->gz); /* mt_unlock(& THIS->lock); */ } do_free_string(THIS->dict); THIS->dict = NULL; if(args>2) { if(TYPEOF(sp[2-args]) != T_INT) Pike_error("Bad argument 3 to gz->create()\n"); wbits = sp[2-args].u.integer; if( wbits == 0 ) wbits = 15; if( wbits < 8 || wbits > 15 ) Pike_error("Invalid window size for gz_deflate->create().\n"); } #define TTS(type) (((type) == PIKE_T_STRING && "string") \ || ((type) == PIKE_T_MAPPING && "mapping")\ || ((type) == PIKE_T_ARRAY && "array") \ || ((type) == PIKE_T_FLOAT && "float") \ || ((type) == PIKE_T_INT && "int") \ || ((type) == PIKE_T_OBJECT && "object") \ || "mixed") #define GET_TYPE(type, name) ((tmp = simple_mapping_string_lookup(m, name)) \ && (TYPEOF(*(tmp)) == PIKE_T_##type || (Pike_error("Expected type %s,"\ "got type %s for " name ".", TTS(PIKE_T_##type), TTS(TYPEOF(*tmp))), 0))) if(args) { if (TYPEOF(sp[-args]) == T_MAPPING && args == 1) { struct mapping *m = sp[-args].u.mapping; struct svalue *tmp; if (GET_TYPE(INT, "strategy")) strategy = tmp->u.integer; if (GET_TYPE(INT, "window_size")) { wbits = tmp->u.integer; if (wbits == 0) wbits = 15; if (wbits < 8 || wbits > 15) Pike_error("Invalid window size for gz_deflate->create().\n"); } if (GET_TYPE(STRING, "dictionary")) { if (tmp->u.string->size_shift) Pike_error("dictionary cannot be a wide string in " "gz_deflate->create().\n"); THIS->dict = tmp->u.string; add_ref(THIS->dict); } if (GET_TYPE(INT, "level")) { THIS->level = tmp->u.integer; goto LVL_CHECK; } } else { if(TYPEOF(sp[-args]) != T_INT) Pike_error("Bad argument 1 to gz->create()\n"); THIS->level=sp[-args].u.integer; LVL_CHECK: if( THIS->level < 0 ) { wbits = -wbits; THIS->level = -THIS->level; } if(THIS->level < Z_NO_COMPRESSION || THIS->level > Z_BEST_COMPRESSION) { Pike_error("Compression level out of range for " "gz_deflate->create()\n"); } } } if(args>1) { if(TYPEOF(sp[1-args]) != T_INT) Pike_error("Bad argument 2 to gz->create()\n"); strategy=sp[1-args].u.integer; if(strategy != Z_DEFAULT_STRATEGY && strategy != Z_FILTERED && #ifdef Z_RLE strategy != Z_RLE && #endif #ifdef Z_FIXED strategy != Z_FIXED && #endif strategy != Z_HUFFMAN_ONLY) { Pike_error("Invalid compression strategy for gz_deflate->create()\n"); } } pop_n_elems(args); THIS->gz.zalloc=Z_NULL; THIS->gz.zfree=Z_NULL; THIS->gz.opaque=(void *)THIS; /* mt_lock(& THIS->lock); */ do { tmp=deflateInit2(&THIS->gz, THIS->level, Z_DEFLATED, wbits, 9, strategy ); if (tmp == Z_STREAM_ERROR) { /* zlib 1.1.4's deflateInit2() only supports wbits 9..15 (not 8). */ if (wbits == -8) wbits = -9; else if (wbits == 8) wbits = 9; else break; continue; } break; } while(1); /* mt_unlock(& THIS->lock); */ switch(tmp) { case Z_OK: if (THIS->dict) { int err; err = deflateSetDictionary(&THIS->gz, (const Bytef*)THIS->dict->str, THIS->dict->len); if (err != Z_OK) { Pike_error("failed to set dictionary in deflate init.\n"); } } return; case Z_VERSION_ERROR: Pike_error("libz not compatible with zlib.h!!!\n"); break; case Z_MEM_ERROR: Pike_error ("Out of memory while initializing Gz.deflate.\n"); break; default: if(THIS->gz.msg) Pike_error("Failed to initialize Gz.deflate: %s\n",THIS->gz.msg); else Pike_error("Failed to initialize Gz.deflate (%d).\n", tmp); } } /*! @decl Gz.deflate clone() *! *! Clones the deflate object. Typically used to test compression *! of new content using the same exact state. *! */ static void gz_deflate_clone(INT32 UNUSED(args)) { int tmp; struct object *ob = low_clone(deflate_program); struct zipper *clone = get_storage(ob, deflate_program); clone->level = THIS->level; clone->state = THIS->state; push_object(ob); switch(tmp = deflateCopy(&clone->gz, &THIS->gz)) { case Z_OK: break; case Z_MEM_ERROR: Pike_error ("Out of memory while cloning Gz.deflate.\n"); break; default: if(THIS->gz.msg) Pike_error("Failed to clone Gz.deflate: %s\n",THIS->gz.msg); else Pike_error("Failed to clone Gz.deflate (%d).\n", tmp); } } #ifdef _REENTRANT static void do_mt_unlock (PIKE_MUTEX_T *lock) { mt_unlock (lock); } #endif static int do_deflate(struct byte_buffer *buf, struct zipper *this, int flush) { int ret=0; #ifdef _REENTRANT ONERROR uwp; THREADS_ALLOW(); mt_lock(& this->lock); THREADS_DISALLOW(); SET_ONERROR (uwp, do_mt_unlock, &this->lock); #endif if(!this->gz.state) ret=Z_STREAM_ERROR; else do { this->gz.next_out=(Bytef *)buffer_alloc(buf, /* recommended by the zlib people */ (this->gz.avail_out = this->gz.avail_in ? this->gz.avail_in+this->gz.avail_in/1000+42 : 4096)); THREADS_ALLOW(); ret=deflate(& this->gz, flush); THREADS_DISALLOW(); /* Absorb any unused space /Hubbe */ buffer_remove(buf, this->gz.avail_out); if(ret == Z_BUF_ERROR) ret=Z_OK; } while (ret==Z_OK && (this->gz.avail_in || !this->gz.avail_out)); #ifdef _REENTRANT CALL_AND_UNSET_ONERROR (uwp); #endif return ret; } void low_zlibmod_pack(struct memobj data, struct byte_buffer *buf, int level, int strategy, int wbits) { struct zipper z; int ret; if(level < Z_NO_COMPRESSION || level > Z_BEST_COMPRESSION) Pike_error("Compression level out of range for pack. %d %d %d\n", Z_DEFAULT_COMPRESSION, Z_NO_COMPRESSION, Z_BEST_COMPRESSION); if(strategy != Z_DEFAULT_STRATEGY && strategy != Z_FILTERED && #ifdef Z_RLE strategy != Z_RLE && #endif #ifdef Z_FIXED strategy != Z_FIXED && #endif strategy != Z_HUFFMAN_ONLY) Pike_error("Invalid compression strategy %d for pack.\n", strategy); if( wbits<0 ? (wbits<-15 || wbits>-8) : (wbits<8 || wbits>15 ) ) Pike_error("Invalid window size value %d for pack.\n", wbits); memset(&z, 0, sizeof(z)); z.gz.zalloc = Z_NULL; z.gz.zfree = Z_NULL; z.gz.next_in = (Bytef *)data.ptr; z.gz.avail_in = (unsigned INT32)(data.len); do { ret = deflateInit2(&z.gz, level, Z_DEFLATED, wbits, 9, strategy); if (ret == Z_STREAM_ERROR) { /* zlib 1.1.4's deflateInit2() only supports wbits 9..15 (not 8). */ if (wbits == -8) wbits = -9; else if (wbits == 8) wbits = 9; else break; continue; } break; } while(1); switch(ret) { case Z_OK: break; case Z_VERSION_ERROR: Pike_error("libz not compatible with zlib.h!!!\n"); break; case Z_MEM_ERROR: Pike_error ("Out of memory while initializing Gz.compress.\n"); break; default: deflateEnd(&z.gz); if(z.gz.msg) Pike_error("Failed to initialize Gz.compress: %s\n", z.gz.msg); else Pike_error("Failed to initialize Gz.compress (%d).\n", ret); } mt_init(&z.lock); ret = do_deflate(buf, &z, Z_FINISH); deflateEnd(&z.gz); mt_destroy(&z.lock); if(ret != Z_STREAM_END) Pike_error("Error while deflating data (%d).\n",ret); } void zlibmod_pack(struct pike_string *data, struct byte_buffer *buf, int level, int strategy, int wbits) { struct memobj lowdata; lowdata.ptr = data->str; lowdata.len = data->len; lowdata.shift = data->size_shift; low_zlibmod_pack(lowdata, buf, level, strategy, wbits); } /*! @endclass */ /*! @decl string(8bit) compress(string(8bit)|String.Buffer|System.Memory|Stdio.Buffer data, @ *! void|int(0..1) raw, @ *! void|int(0..9) level, void|int strategy, @ *! void|int(8..15) window_size) *! *! Encodes and returns the input @[data] according to the deflate *! format defined in @rfc{1951@}. *! *! @param data *! The data to be encoded. *! *! @param raw *! If set, the data is encoded without the header and footer *! defined in @rfc{1950@}. Example of uses is the ZIP container *! format. *! *! @param level *! Indicates the level of effort spent to make the data compress *! well. Zero means no packing, 2-3 is considered 'fast', 8 is *! default and higher is considered 'slow' but gives better *! packing. *! *! @param strategy *! The strategy to be used when compressing the data. One of the *! following. *! @int *! @value DEFAULT_STRATEGY *! The default strategy as selected in the zlib library. *! @value FILTERED *! This strategy is intented for data created by a filter or *! predictor and will put more emphasis on huffman encoding and *! less on LZ string matching. This is between DEFAULT_STRATEGY *! and HUFFMAN_ONLY. *! @value RLE *! This strategy is even closer to the HUFFMAN_ONLY in that it *! only looks at the latest byte in the window, i.e. a window *! size of 1 byte is sufficient for decompression. This mode is *! not available in all zlib versions. *! @value HUFFMAN_ONLY *! This strategy will turn of string matching completely, only *! doing huffman encoding. Window size doesn't matter in this *! mode and the data can be decompressed with a zero size window. *! @value FIXED *! In this mode dynamic huffman codes are disabled, allowing for *! a simpler decoder for special applications. This mode is not *! available in all zlib versions. *! @endint *! *! @param window_size *! Defines the size of the LZ77 window from 256 bytes to 32768 *! bytes, expressed as 2^x. *! *! @seealso *! @[deflate], @[inflate], @[uncompress] */ static void gz_compress(INT32 args) { struct svalue *data_arg; struct memobj data; struct byte_buffer buf; ONERROR err; int wbits = 15; int raw = 0; int level = 8; int strategy = Z_DEFAULT_STRATEGY; get_all_args(NULL, args, "%*.%d%d%d%d", &data_arg, &raw, &level, &strategy, &wbits); switch (TYPEOF(*data_arg)) { case PIKE_T_STRING: { struct pike_string *s = data_arg->u.string; data.ptr = (unsigned char*)s->str; data.len = s->len; data.shift = s->size_shift; break; } case PIKE_T_OBJECT: { enum memobj_type t = get_memory_object_memory(data_arg->u.object, &data.ptr, &data.len, &data.shift); if (t != MEMOBJ_NONE) break; } /* FALLTHRU */ default: SIMPLE_ARG_TYPE_ERROR("compress", 1, "string|String.Buffer|System.Memory|Stdio.Buffer"); } if (data.shift) Pike_error("Cannot input wide string to compress\n"); if( !wbits ) wbits = 15; if( raw ) wbits = -wbits; buffer_init(&buf); SET_ONERROR(err, buffer_free, &buf); low_zlibmod_pack(data, &buf, level, strategy, wbits); UNSET_ONERROR(err); pop_n_elems(args); push_string(buffer_finish_pike_string(&buf)); } /*! @class deflate */ /*! @decl string(8bit) deflate(string(8bit)|String.Buffer|System.Memory|Stdio.Buffer data, @ *! int|void flush) *! *! This function performs gzip style compression on a string @[data] and *! returns the packed data. Streaming can be done by calling this *! function several times and concatenating the returned data. *! *! The optional argument @[flush] should be one of the following: *! @int *! @value Gz.NO_FLUSH *! Only data that doesn't fit in the internal buffers is returned. *! @value Gz.PARTIAL_FLUSH *! All input is packed and returned. *! @value Gz.SYNC_FLUSH *! All input is packed and returned. *! @value Gz.FINISH *! All input is packed and an 'end of data' marker is appended. *! @endint *! *! @seealso *! @[Gz.inflate->inflate()] */ static void gz_deflate(INT32 args) { struct memobj data; int flush, fail; struct zipper *this=THIS; struct byte_buffer buf; ONERROR err; if(THIS->state == 1) { deflateEnd(& THIS->gz); deflateInit(& THIS->gz, THIS->level); THIS->state=0; } if(!THIS->gz.state) Pike_error("gz_deflate not initialized or destructed\n"); if(args<1) Pike_error("Too few arguments to gz_deflate->deflate()\n"); switch (TYPEOF(Pike_sp[-args])) { case PIKE_T_STRING: { struct pike_string *s = Pike_sp[-args].u.string; data.ptr = (unsigned char*)s->str; data.len = s->len; data.shift = s->size_shift; break; } case PIKE_T_OBJECT: { enum memobj_type t = get_memory_object_memory(Pike_sp[-args].u.object, &data.ptr, &data.len, &data.shift); if (t != MEMOBJ_NONE) break; } /* FALLTHRU */ default: Pike_error("Bad argument 1 to gz_deflate->deflate()\n"); } if (data.shift) Pike_error("Cannot input wide string to gz_deflate->deflate()\n"); if(args>1) { if(TYPEOF(sp[1-args]) != T_INT) Pike_error("Bad argument 2 to gz_deflate->deflate()\n"); flush=sp[1-args].u.integer; switch(flush) { case Z_PARTIAL_FLUSH: case Z_FINISH: case Z_SYNC_FLUSH: case Z_NO_FLUSH: break; default: Pike_error("Argument 2 to gz_deflate->deflate() out of range.\n"); } }else{ flush=Z_FINISH; } this->gz.next_in=(Bytef *)data.ptr; this->gz.avail_in = (unsigned INT32)(data.len); buffer_init(&buf); SET_ONERROR(err,buffer_free,&buf); fail=do_deflate(&buf,this,flush); UNSET_ONERROR(err); if(fail != Z_OK && fail != Z_STREAM_END) { buffer_free(&buf); if(THIS->gz.msg) Pike_error("Error in gz_deflate->deflate(): %s\n",THIS->gz.msg); else Pike_error("Error in gz_deflate->deflate(): %d\n",fail); } if(fail == Z_STREAM_END) THIS->state=1; pop_n_elems(args); push_string(buffer_finish_pike_string(&buf)); } static void init_gz_deflate(struct object *UNUSED(o)) { mt_init(& THIS->lock); THIS->gz.zalloc=Z_NULL; THIS->gz.zfree=Z_NULL; THIS->gz.opaque=(void *)THIS; THIS->state=0; deflateInit(& THIS->gz, THIS->level = Z_DEFAULT_COMPRESSION); THIS->epilogue = NULL; } static void exit_gz_deflate(struct object *UNUSED(o)) { /* mt_lock(& THIS->lock); */ deflateEnd(&THIS->gz); do_free_string(THIS->epilogue); do_free_string(THIS->dict); /* mt_unlock(& THIS->lock); */ mt_destroy( & THIS->lock ); } /*! @endclass */ /*******************************************************************/ /*! @class inflate *! *! This class interfaces with the uncompression routines in the libz library. *! *! @note *! This program is only available if libz was available and found when *! Pike was compiled. *! *! @seealso *! @[deflate], @[compress], @[uncompress] */ /*! @decl void create(int|void window_size) *! @decl void create(mapping options) *! *! If called with a mapping as only argument, @expr{create@} accepts *! the entries @expr{window_size@} (described below) and *! @expr{dictionary@}, which is a string to be set as dictionary. *! *! The window_size value is passed down to inflateInit2 in zlib. *! *! If the argument is negative, no header checks are done, and no *! verification of the data will be done either. This is needed for *! uncompressing ZIP-files, as an example. The negative value is then *! negated, and handled as a positive value. *! *! Positive arguments set the maximum dictionary size to an exponent *! of 2, such that 8 (the minimum) will cause the window size to be *! 256, and 15 (the maximum, and default value) will cause it to be *! 32Kb. Setting this to anything except 15 is rather pointless in *! Pike. *! *! It can be used to limit the amount of memory that is used to *! uncompress files, but 32Kb is not all that much in the great *! scheme of things. *! *! To decompress files compressed with level 9 compression, a 32Kb *! window size is needed. level 1 compression only requires a 256 *! byte window. *! *! If the @[options] version is used you can specify your own dictionary in addition to the window size. *! *! @mapping options *! @member string dictionary *! @member int window_size *! @endmapping */ static void gz_inflate_create(INT32 args) { int tmp, *tmp_p = &tmp; if(THIS->gz.state) { /* mt_lock(& THIS->lock); */ inflateEnd(&THIS->gz); /* mt_unlock(& THIS->lock); */ } THIS->gz.zalloc=Z_NULL; THIS->gz.zfree=Z_NULL; THIS->gz.opaque=(void *)THIS; if(args && TYPEOF(Pike_sp[-1]) == PIKE_T_MAPPING) { struct mapping *m = Pike_sp[-1].u.mapping; struct svalue *tmp; if (GET_TYPE(STRING, "dictionary")) { if (tmp->u.string->size_shift) Pike_error("dictionary cannot be a wide string in " "gz_inflate->create().\n"); THIS->dict = tmp->u.string; add_ref(THIS->dict); } if (GET_TYPE(INT, "window_size")) *tmp_p=inflateInit2(& THIS->gz, tmp->u.integer); else *tmp_p=inflateInit( &THIS->gz ); } else { if( args && TYPEOF(Pike_sp[-1]) == PIKE_T_INT ) { tmp=inflateInit2(& THIS->gz, Pike_sp[-1].u.integer); } else { tmp=inflateInit( &THIS->gz ); } } pop_n_elems(args); /* mt_lock(& THIS->lock); */ /* mt_unlock(& THIS->lock); */ switch(tmp) { case Z_OK: #if 0 /* this apparently works with newer zlibs only. */ if (THIS->dict) { int err; err = inflateSetDict(&THIS->gz, (const Bytef*)THIS->dict->str, THIS->dict->len); if (err != Z_OK) Pike_error("inflateSetDict on startup failed.\n"); } #endif return; case Z_VERSION_ERROR: Pike_error("libz not compatible with zlib.h!!!\n"); break; case Z_MEM_ERROR: Pike_error ("Out of memory while initializing Gz.inflate.\n"); break; default: if(THIS->gz.msg) Pike_error("Failed to initialize Gz.inflate: %s\n",THIS->gz.msg); else Pike_error("Failed to initialize Gz.inflate (%d).\n", tmp); } } static int do_inflate(struct byte_buffer *buf, struct zipper *this, int flush) { int fail=0; #ifdef _REENTRANT ONERROR uwp; THREADS_ALLOW(); mt_lock(& this->lock); THREADS_DISALLOW(); SET_ONERROR (uwp, do_mt_unlock, &this->lock); #endif if(!this->gz.state) { fail=Z_STREAM_ERROR; }else{ #if 0 static int fnord=0; fnord++; #endif do { char *loc; int ret; loc=buffer_alloc(buf, BUF); THREADS_ALLOW(); this->gz.next_out=(Bytef *)loc; this->gz.avail_out=BUF; ret=inflate(& this->gz, flush); THREADS_DISALLOW(); buffer_remove(buf, this->gz.avail_out); if(ret == Z_BUF_ERROR) ret=Z_OK; if (ret == Z_NEED_DICT && this->dict) ret = inflateSetDictionary(&this->gz, (const Bytef*)this->dict->str, this->dict->len); if(ret != Z_OK) { fail=ret; break; } } while(!this->gz.avail_out || flush==Z_FINISH || this->gz.avail_in); } #ifdef _REENTRANT CALL_AND_UNSET_ONERROR (uwp); #endif return fail; } void low_zlibmod_unpack(struct memobj data, struct byte_buffer *buf, int raw) { struct zipper z; int ret; memset(&z, 0, sizeof(z)); z.gz.zalloc = Z_NULL; z.gz.zfree = Z_NULL; z.gz.next_in=(Bytef *)data.ptr; z.gz.avail_in = (unsigned INT32)(data.len); if( raw ) ret = inflateInit2(&z.gz, -15); else ret = inflateInit( &z.gz ); switch(ret) { case Z_OK: break; case Z_VERSION_ERROR: Pike_error("libz not compatible with zlib.h!!!\n"); break; case Z_MEM_ERROR: Pike_error ("Out of memory while initializing Gz.uncompress.\n"); inflateEnd(&z.gz); break; default: inflateEnd( &z.gz ); if(z.gz.msg) Pike_error("Failed to initialize Gz.uncompress: %s\n", z.gz.msg); else Pike_error("Failed to initialize Gz.uncompress (%d).\n", ret); } mt_init(&z.lock); ret = do_inflate(buf, &z, Z_SYNC_FLUSH); mt_destroy(&z.lock); inflateEnd( &z.gz ); if(ret==Z_OK) Pike_error("Compressed data is truncated.\n"); if(ret!=Z_STREAM_END) Pike_error("Failed to inflate data (%d).\n", ret); } void zlibmod_unpack(struct pike_string *data, struct byte_buffer *buf, int raw) { struct memobj lowdata; lowdata.ptr = data->str; lowdata.len = data->len; lowdata.shift = data->size_shift; low_zlibmod_unpack(lowdata, buf, raw); } /*! @endclass */ /*! @decl string(8bit) uncompress(string(8bit)|String.Buffer|System.Memory|Stdio.Buffer data, void|int(0..1) raw) *! *! Uncompresses the @[data] and returns it. The @[raw] parameter *! tells the decoder that the indata lacks the data header and footer *! defined in @rfc{1950@}. */ static void gz_uncompress(INT32 args) { struct byte_buffer buf; struct memobj data; ONERROR err; int raw = 0; if(args<1) SIMPLE_WRONG_NUM_ARGS_ERROR("uncompress", 1); switch (TYPEOF(Pike_sp[-args])) { case PIKE_T_STRING: { struct pike_string *s = Pike_sp[-args].u.string; data.ptr = (unsigned char*)s->str; data.len = s->len; data.shift = s->size_shift; break; } case PIKE_T_OBJECT: { enum memobj_type t = get_memory_object_memory(Pike_sp[-args].u.object, &data.ptr, &data.len, &data.shift); if (t != MEMOBJ_NONE) break; } /* FALLTHRU */ default: SIMPLE_ARG_TYPE_ERROR("uncompress", 1, "string|String.Buffer|System.Memory|Stdio.Buffer"); } if (data.shift) Pike_error("Cannot input wide string to uncompress\n"); if(args>1) { if(TYPEOF(Pike_sp[1-args]) == PIKE_T_INT) raw = Pike_sp[1-args].u.integer; else SIMPLE_ARG_TYPE_ERROR("uncompress", 2, "int"); } buffer_init(&buf); SET_ONERROR(err, buffer_free, &buf); low_zlibmod_unpack(data, &buf, raw); UNSET_ONERROR(err); pop_n_elems(args); push_string(buffer_finish_pike_string(&buf)); } /*! @class inflate */ /*! @decl string(8bit) inflate(string(8bit)|String.Buffer|System.Memory|Stdio.Buffer data) *! *! This function performs gzip style decompression. It can inflate *! a whole file at once or in blocks. *! *! @example *! // whole file *! @code *! write(Gz.inflate()->inflate(stdin->read(0x7fffffff)); *! *! // streaming (blocks) *! function inflate=Gz.inflate()->inflate; *! while(string s=stdin->read(8192)) *! write(inflate(s)); *! @endcode *! *! @seealso *! @[Gz.deflate->deflate()], @[Gz.decompress] */ static void gz_inflate(INT32 args) { struct memobj data; int fail; struct zipper *this=THIS; struct byte_buffer buf; ONERROR err; if(!THIS->gz.state) Pike_error("gz_inflate not initialized or destructed\n"); if(args<1) Pike_error("Too few arguments to gz_inflate->inflate()\n"); switch (TYPEOF(Pike_sp[-args])) { case PIKE_T_STRING: { struct pike_string *s = Pike_sp[-args].u.string; data.ptr = (unsigned char*)s->str; data.len = s->len; data.shift = s->size_shift; break; } case PIKE_T_OBJECT: { enum memobj_type t = get_memory_object_memory(Pike_sp[-args].u.object, &data.ptr, &data.len, &data.shift); if (t != MEMOBJ_NONE) break; } /* FALLTHRU */ default: Pike_error("Bad argument 1 to gz_inflate->inflate()\n"); } if (data.shift) Pike_error("Cannot input wide string to gz_inflate->inflate()\n"); this->gz.next_in=(Bytef *)data.ptr; this->gz.avail_in = (unsigned INT32)(data.len); buffer_init(&buf); SET_ONERROR(err,buffer_free,&buf); fail=do_inflate(&buf,this,Z_SYNC_FLUSH); UNSET_ONERROR(err); if(fail != Z_OK && fail != Z_STREAM_END) { buffer_free(&buf); if(THIS->gz.msg) Pike_error("Error in gz_inflate->inflate(): %s\n",THIS->gz.msg); else Pike_error("Error in gz_inflate->inflate(): %d\n",fail); } pop_n_elems(args); push_string(buffer_finish_pike_string(&buf)); if(fail == Z_STREAM_END) { struct pike_string *old_epilogue = this->epilogue; if(old_epilogue) { push_string(old_epilogue); this->epilogue = NULL; } push_string(make_shared_binary_string((const char *)this->gz.next_in, this->gz.avail_in)); if(old_epilogue) f_add(2); if(TYPEOF(sp[-1]) == PIKE_T_STRING) this->epilogue = (--sp)->u.string; else pop_stack(); } } /*! @decl string(8bit) end_of_stream() *! *! This function returns 0 if the end of stream marker has not yet *! been encountered, or a string (possibly empty) containg any extra data *! received following the end of stream marker if the marker has been *! encountered. If the extra data is not needed, the result of this *! function can be treated as a logical value. */ static void gz_end_of_stream(INT32 args) { struct zipper *this=THIS; pop_n_elems(args); if(this->epilogue) ref_push_string(this->epilogue); else push_int(0); } static void init_gz_inflate(struct object *UNUSED(o)) { mt_init(& THIS->lock); THIS->gz.zalloc=Z_NULL; THIS->gz.zfree=Z_NULL; THIS->gz.opaque=(void *)THIS; inflateInit(&THIS->gz); inflateEnd(&THIS->gz); THIS->epilogue = NULL; } static void exit_gz_inflate(struct object *UNUSED(o)) { /* mt_lock(& THIS->lock); */ inflateEnd(& THIS->gz); do_free_string(THIS->epilogue); do_free_string(THIS->dict); /* mt_unlock(& THIS->lock); */ mt_destroy( & THIS->lock ); } /*! @endclass */ /*! @decl int crc32(string(8bit) data, void|int(0..) start_value) *! *! This function calculates the standard ISO3309 Cyclic Redundancy Check. */ static void gz_crc32(INT32 args) { unsigned INT32 crc; if (!args || TYPEOF(sp[-args]) != T_STRING) Pike_error("Gz.crc32: illegal or missing argument 1 (expected string)\n"); if (sp[-args].u.string->size_shift) Pike_error("Cannot input wide string to Gz.crc32\n"); if (args>1) { if (TYPEOF(sp[1-args]) != T_INT) Pike_error("Gz.crc32: illegal argument 2 (expected integer)\n"); else crc=(unsigned INT32)sp[1-args].u.integer; } else crc=0; crc=crc32(crc, (unsigned char*)sp[-args].u.string->str, (unsigned INT32)(sp[-args].u.string->len)); pop_n_elems(args); push_int64((INT64)crc); } /*! @decl int adler32(string(8bit) data, void|int(0..) start_value) *! *! This function calculates the Adler-32 Cyclic Redundancy Check. */ static void gz_adler32(INT32 args) { unsigned INT32 crc; if (!args || TYPEOF(sp[-args]) != T_STRING) Pike_error("Gz.adler32: illegal or missing argument 1 (expected string)\n"); if (sp[-args].u.string->size_shift) Pike_error("Cannot input wide string to Gz.adler32\n"); if (args>1) { if (TYPEOF(sp[1-args]) != T_INT) Pike_error("Gz.adler32: illegal argument 2 (expected integer)\n"); else crc=(unsigned INT32)sp[1-args].u.integer; } else crc=1; crc=adler32(crc, (unsigned char*)sp[-args].u.string->str, (unsigned INT32)(sp[-args].u.string->len)); pop_n_elems(args); push_int64((INT64)crc); } static void gz_deflate_size( INT32 args ) { #define L_CODES (256 + 29 + 1) #define HEAP_SIZE (2*L_CODES+1) pop_n_elems(args); /* estimation, from reading deflate.h. We could get a rather exact * value if we saved memlevel + windowbits somewhere. */ push_int( /* internal_state structure, estimating alignment */ (47 * 4) + sizeof(void*)*16 + (4*HEAP_SIZE) + (4*121) + (4*(2*19+1)) + 16*2 + (2*L_CODES+1)*5 + /* d_buf <memlevel+6>, l_buf<memlevel+6>, window<windowbits>, hash<memlevel+7> */ 16384*2 + 16384*2 + 65536*2 + 32768*2); } static void gz_inflate_size( INT32 args ) { pop_n_elems(args); /* low-order estimation, from reading inflate.h */ push_int( /* inflate_state structure. */ ((28 * sizeof(void*)) + (320 * 2) + (288 * 2)) + /* codes[] */ (2048 * 4) + /* window, really 1<<wbits, max wbits is 16. */ 65536); } /*! @endmodule */ #endif PIKE_MODULE_INIT { #ifdef HAVE_ZLIB_H struct z_stream_s z; /* Used to detect support for extensions. */ int have_rle = 0; int have_fixed = 0; start_new_program(); deflate_program = Pike_compiler->new_program; ADD_STORAGE(struct zipper); /* function(int|void,int|void,int|void:void) */ ADD_FUNCTION("create",gz_deflate_create,tFunc(tOr(tMapping, tOr(tInt,tVoid)) tOr(tInt,tVoid) tOr(tInt,tVoid),tVoid),0); /* function(:Gz.deflate) */ ADD_FUNCTION("clone", gz_deflate_clone, tFunc(tVoid,tObj), 0); /* function(string(8bit)|String.Buffer|System.Memory|Stdio.Buffer,int|void:string(8bit)) */ ADD_FUNCTION("deflate",gz_deflate,tFunc(tOr(tStr8,tObj) tOr(tInt,tVoid),tStr8),0); ADD_FUNCTION("_size_object", gz_deflate_size, tFunc(tVoid,tInt), 0); add_integer_constant("NO_FLUSH",Z_NO_FLUSH,0); add_integer_constant("PARTIAL_FLUSH",Z_PARTIAL_FLUSH,0); add_integer_constant("SYNC_FLUSH",Z_SYNC_FLUSH,0); add_integer_constant("FINISH",Z_FINISH,0); add_integer_constant("DEFAULT_STRATEGY", Z_DEFAULT_STRATEGY,0); add_integer_constant("FILTERED", Z_FILTERED,0); add_integer_constant("HUFFMAN_ONLY", Z_HUFFMAN_ONLY,0); memset(&z, 0, sizeof(z)); #ifdef Z_RLE if (deflateInit2(&z, 8, Z_DEFLATED, 9, 9, Z_RLE) == Z_OK) { have_rle = 1; deflateEnd(&z); add_integer_constant("RLE", Z_RLE,0); } #endif #ifdef Z_FIXED if (deflateInit2(&z, 8, Z_DEFLATED, 9, 9, Z_FIXED) == Z_OK) { have_fixed = 1; deflateEnd(&z); add_integer_constant("FIXED", Z_FIXED,0); } #endif set_init_callback(init_gz_deflate); set_exit_callback(exit_gz_deflate); end_class("deflate",0); start_new_program(); ADD_STORAGE(struct zipper); /* function(int|void:void) */ ADD_FUNCTION("create",gz_inflate_create,tFunc(tOr(tMapping,tOr(tInt,tVoid)),tVoid),0); /* function(string(8bit)|String.Buffer|System.Memory|Stdio.Buffer:string(8bit)) */ ADD_FUNCTION("inflate",gz_inflate,tFunc(tOr(tStr8,tObj),tStr8),0); /* function(:string(8bit)) */ ADD_FUNCTION("end_of_stream",gz_end_of_stream,tFunc(tNone,tStr8),0); ADD_FUNCTION("_size_object", gz_inflate_size, tFunc(tVoid,tInt), 0); add_integer_constant("NO_FLUSH",Z_NO_FLUSH,0); add_integer_constant("PARTIAL_FLUSH",Z_PARTIAL_FLUSH,0); add_integer_constant("SYNC_FLUSH",Z_SYNC_FLUSH,0); add_integer_constant("FINISH",Z_FINISH,0); set_init_callback(init_gz_inflate); set_exit_callback(exit_gz_inflate); end_class("inflate",0); add_integer_constant("NO_FLUSH",Z_NO_FLUSH,0); add_integer_constant("BLOCK",Z_BLOCK,0); add_integer_constant("PARTIAL_FLUSH",Z_PARTIAL_FLUSH,0); add_integer_constant("SYNC_FLUSH",Z_SYNC_FLUSH,0); add_integer_constant("FULL_FLUSH",Z_FULL_FLUSH,0); add_integer_constant("FINISH",Z_FINISH,0); add_integer_constant("DEFAULT_STRATEGY", Z_DEFAULT_STRATEGY,0); add_integer_constant("FILTERED", Z_FILTERED,0); add_integer_constant("HUFFMAN_ONLY", Z_HUFFMAN_ONLY,0); #ifdef Z_RLE if (have_rle) { add_integer_constant("RLE", Z_RLE,0); } #endif #ifdef Z_FIXED if (have_fixed) { add_integer_constant("FIXED", Z_FIXED,0); } #endif /* function(string(8bit),void|int:int) */ ADD_FUNCTION("crc32",gz_crc32,tFunc(tStr8 tOr(tVoid,tIntPos),tIntPos),0); ADD_FUNCTION("adler32",gz_adler32,tFunc(tStr8 tOr(tVoid,tIntPos),tIntPos),0); /* function(string(8bit)|String.Buffer|System.Memory|Stdio.Buffer,void|int(0..1),void|int,void|int:string(8bit)) */ ADD_FUNCTION("compress",gz_compress,tFunc(tOr(tStr8,tObj) tOr(tVoid,tInt01) tOr(tVoid,tInt09) tOr(tVoid,tInt) tOr(tVoid,tInt),tStr8),0); /* function(string(8bit)|String.Buffer|System.Memory|Stdio.Buffer,void|int(0..1):string(8bit)) */ ADD_FUNCTION("uncompress",gz_uncompress,tFunc(tOr(tStr8,tObj) tOr(tVoid,tInt01),tStr8),0); PIKE_MODULE_EXPORT(Gz, crc32); PIKE_MODULE_EXPORT(Gz, zlibmod_pack); PIKE_MODULE_EXPORT(Gz, zlibmod_unpack); #else HIDE_MODULE(); #endif } PIKE_MODULE_EXIT {}

pike.git/ src/ modules/ Gz/ zlibmod.c > a7659b8c8d2a5f7c8eee4cbf6e7deabd01bf799f [Annotate]