1 /* zlib.h -- interface of the 'zlib' general purpose compression library 2 version 1.2.4, Mar 14th, 2010 3 4 Copyright (C) 1995-2010 Jean-loup Gailly and Mark Adler 5 6 This software is provided 'as-is', without any express or implied 7 warranty. In no event will the authors be held liable for any damages 8 arising from the use of this software. 9 10 Permission is granted to anyone to use this software for any purpose, 11 including commercial applications, and to alter it and redistribute it 12 freely, subject to the following restrictions: 13 14 1. The origin of this software must not be misrepresented; you must not 15 claim that you wrote the original software. If you use this software 16 in a product, an acknowledgment in the product documentation would be 17 appreciated but is not required. 18 2. Altered source versions must be plainly marked as such, and must not be 19 misrepresented as being the original software. 20 3. This notice may not be removed or altered from any source distribution. 21 22 Jean-loup Gailly Mark Adler 23 jloup@gzip.org madler@alumni.caltech.edu 24 25 26 The data format used by the zlib library is described by RFCs (Request for 27 Comments) 1950 to 1952 in the files http://www.ietf.org/rfc/rfc1950.txt 28 (zlib format), rfc1951.txt (deflate format) and rfc1952.txt (gzip format). 29 */ 30 31 #ifndef ZLIB_H 32 #define ZLIB_H 33 34 #if defined( INC_ALL ) 35 #include "config.h" 36 #include "zconf.h" 37 #else 38 #include "misc/config.h" 39 #include "zlib/zconf.h" 40 #endif /* Compiler-specific includes */ 41 42 /* Disable gzip header inclusion and crc32 code - pcg */ 43 44 #define NO_GZIP 45 #define NO_GUNZIP 46 47 /* VxWorks includes its own internal copy of zlib so we need to correct 48 clashing global symbols in order to avoid link errors */ 49 50 #ifdef __VxWorks__ 51 #define inflate cl_inflate 52 #define inflate_copyright cl_inflate_copyright 53 #define zlibVersion cl_zlibVersion 54 #endif /* __VxWorks__ */ 55 56 /* Also need to disable attempt to include errno.h, this is never used so 57 it's easiest to edit it out of zutil.h - pcg */ 58 59 #if defined( ZLIB_INTERNAL ) && defined( _MSC_VER ) 60 /* cryptlib is built with the highest warning level, disable some of the 61 more irritating warnings produced by the zlib code. In theory we 62 could also disable warnings about K&R style declarations with 63 '#pragma warning( disable: 4131 )', but we need to catch and manually 64 fix all of these for the PalmOS gcc, so we leave them enabled - pcg */ 65 #pragma warning( disable: 4127 ) /* Conditional is constant: while( TRUE ) */ 66 #pragma warning( disable: 4244 ) /* int <-> unsigned char/short */ 67 #endif /* zlib-internal code under VC++ */ 68 69 /* For some totally insane reason zlib uses 1970s-vintage K&R-style function 70 declarations internally, requiring manual editing of every single internal 71 function prototype in every single zlib file in order for it to compile 72 - pcg */ 73 74 /* Finally, to build the asm files using MASM 8 so that VC++ 6.0 can use 75 them, use: 76 77 "C:\Program Files\Microsoft Visual Studio 8\VC\bin\ml" /c inffas32.asm 78 "C:\Program Files\Microsoft Visual Studio 8\VC\bin\ml" /c match686.asm 79 80 "C:\Program Files\Microsoft Visual Studio 8\VC\bin\x86_amd64\ml64" /c gvmat64.asm 81 "C:\Program Files\Microsoft Visual Studio 8\VC\bin\x86_amd64\ml64" /c inffasx64.asm 82 83 Don't use any of the /Z flags, which either give CVPACK errors or missing- 84 symbol errors. /coff is allowable, but has no effect - pcg */ 85 86 #ifdef __cplusplus 87 extern "C" { 88 #endif 89 90 #define ZLIB_VERSION "1.2.4" 91 #define ZLIB_VERNUM 0x1240 92 #define ZLIB_VER_MAJOR 1 93 #define ZLIB_VER_MINOR 2 94 #define ZLIB_VER_REVISION 4 95 #define ZLIB_VER_SUBREVISION 0 96 97 /* 98 The 'zlib' compression library provides in-memory compression and 99 decompression functions, including integrity checks of the uncompressed data. 100 This version of the library supports only one compression method (deflation) 101 but other algorithms will be added later and will have the same stream 102 interface. 103 104 Compression can be done in a single step if the buffers are large enough, 105 or can be done by repeated calls of the compression function. In the latter 106 case, the application must provide more input and/or consume the output 107 (providing more output space) before each call. 108 109 The compressed data format used by default by the in-memory functions is 110 the zlib format, which is a zlib wrapper documented in RFC 1950, wrapped 111 around a deflate stream, which is itself documented in RFC 1951. 112 113 The library also supports reading and writing files in gzip (.gz) format 114 with an interface similar to that of stdio using the functions that start 115 with "gz". The gzip format is different from the zlib format. gzip is a 116 gzip wrapper, documented in RFC 1952, wrapped around a deflate stream. 117 118 This library can optionally read and write gzip streams in memory as well. 119 120 The zlib format was designed to be compact and fast for use in memory 121 and on communications channels. The gzip format was designed for single- 122 file compression on file systems, has a larger header than zlib to maintain 123 directory information, and uses a different, slower check method than zlib. 124 125 The library does not install any signal handler. The decoder checks 126 the consistency of the compressed data, so the library should never crash 127 even in case of corrupted input. 128 */ 129 130 typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size)); 131 typedef void (*free_func) OF((voidpf opaque, voidpf address)); 132 133 struct internal_state; 134 135 typedef struct z_stream_s { 136 Bytef *next_in; /* next input byte */ 137 uInt avail_in; /* number of bytes available at next_in */ 138 uLong total_in; /* total nb of input bytes read so far */ 139 140 Bytef *next_out; /* next output byte should be put there */ 141 uInt avail_out; /* remaining free space at next_out */ 142 uLong total_out; /* total nb of bytes output so far */ 143 144 char *msg; /* last error message, NULL if no error */ 145 struct internal_state FAR *state; /* not visible by applications */ 146 147 alloc_func zalloc; /* used to allocate the internal state */ 148 free_func zfree; /* used to free the internal state */ 149 voidpf opaque; /* private data object passed to zalloc and zfree */ 150 151 int data_type; /* best guess about the data type: binary or text */ 152 uLong adler; /* adler32 value of the uncompressed data */ 153 uLong reserved; /* reserved for future use */ 154 } z_stream; 155 156 typedef z_stream FAR *z_streamp; 157 158 /* 159 gzip header information passed to and from zlib routines. See RFC 1952 160 for more details on the meanings of these fields. 161 */ 162 typedef struct gz_header_s { 163 int text; /* true if compressed data believed to be text */ 164 uLong time; /* modification time */ 165 int xflags; /* extra flags (not used when writing a gzip file) */ 166 int os; /* operating system */ 167 Bytef *extra; /* pointer to extra field or Z_NULL if none */ 168 uInt extra_len; /* extra field length (valid if extra != Z_NULL) */ 169 uInt extra_max; /* space at extra (only when reading header) */ 170 Bytef *name; /* pointer to zero-terminated file name or Z_NULL */ 171 uInt name_max; /* space at name (only when reading header) */ 172 Bytef *comment; /* pointer to zero-terminated comment or Z_NULL */ 173 uInt comm_max; /* space at comment (only when reading header) */ 174 int hcrc; /* true if there was or will be a header crc */ 175 int done; /* true when done reading gzip header (not used 176 when writing a gzip file) */ 177 } gz_header; 178 179 typedef gz_header FAR *gz_headerp; 180 181 /* 182 The application must update next_in and avail_in when avail_in has dropped 183 to zero. It must update next_out and avail_out when avail_out has dropped 184 to zero. The application must initialize zalloc, zfree and opaque before 185 calling the init function. All other fields are set by the compression 186 library and must not be updated by the application. 187 188 The opaque value provided by the application will be passed as the first 189 parameter for calls of zalloc and zfree. This can be useful for custom 190 memory management. The compression library attaches no meaning to the 191 opaque value. 192 193 zalloc must return Z_NULL if there is not enough memory for the object. 194 If zlib is used in a multi-threaded application, zalloc and zfree must be 195 thread safe. 196 197 On 16-bit systems, the functions zalloc and zfree must be able to allocate 198 exactly 65536 bytes, but will not be required to allocate more than this if 199 the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS, pointers 200 returned by zalloc for objects of exactly 65536 bytes *must* have their 201 offset normalized to zero. The default allocation function provided by this 202 library ensures this (see zutil.c). To reduce memory requirements and avoid 203 any allocation of 64K objects, at the expense of compression ratio, compile 204 the library with -DMAX_WBITS=14 (see zconf.h). 205 206 The fields total_in and total_out can be used for statistics or progress 207 reports. After compression, total_in holds the total size of the 208 uncompressed data and may be saved for use in the decompressor (particularly 209 if the decompressor wants to decompress everything in a single step). 210 */ 211 212 /* constants */ 213 214 #define Z_NO_FLUSH 0 215 #define Z_PARTIAL_FLUSH 1 216 #define Z_SYNC_FLUSH 2 217 #define Z_FULL_FLUSH 3 218 #define Z_FINISH 4 219 #define Z_BLOCK 5 220 #define Z_TREES 6 221 /* Allowed flush values; see deflate() and inflate() below for details */ 222 223 #define Z_OK 0 224 #define Z_STREAM_END 1 225 #define Z_NEED_DICT 2 226 #define Z_ERRNO (-1) 227 #define Z_STREAM_ERROR (-2) 228 #define Z_DATA_ERROR (-3) 229 #define Z_MEM_ERROR (-4) 230 #define Z_BUF_ERROR (-5) 231 #define Z_VERSION_ERROR (-6) 232 /* Return codes for the compression/decompression functions. Negative values 233 * are errors, positive values are used for special but normal events. 234 */ 235 236 #define Z_NO_COMPRESSION 0 237 #define Z_BEST_SPEED 1 238 #define Z_BEST_COMPRESSION 9 239 #define Z_DEFAULT_COMPRESSION (-1) 240 /* compression levels */ 241 242 #define Z_FILTERED 1 243 #define Z_HUFFMAN_ONLY 2 244 #define Z_RLE 3 245 #define Z_FIXED 4 246 #define Z_DEFAULT_STRATEGY 0 247 /* compression strategy; see deflateInit2() below for details */ 248 249 #define Z_BINARY 0 250 #define Z_TEXT 1 251 #define Z_ASCII Z_TEXT /* for compatibility with 1.2.2 and earlier */ 252 #define Z_UNKNOWN 2 253 /* Possible values of the data_type field (though see inflate()) */ 254 255 #define Z_DEFLATED 8 256 /* The deflate compression method (the only one supported in this version) */ 257 258 #define Z_NULL 0 /* for initializing zalloc, zfree, opaque */ 259 260 #define zlib_version zlibVersion() 261 /* for compatibility with versions < 1.0.2 */ 262 263 264 /* basic functions */ 265 266 ZEXTERN const char * ZEXPORT zlibVersion OF((void)); 267 /* The application can compare zlibVersion and ZLIB_VERSION for consistency. 268 If the first character differs, the library code actually used is not 269 compatible with the zlib.h header file used by the application. This check 270 is automatically made by deflateInit and inflateInit. 271 */ 272 273 /* 274 ZEXTERN int ZEXPORT deflateInit OF((z_streamp strm, int level)); 275 276 Initializes the internal stream state for compression. The fields 277 zalloc, zfree and opaque must be initialized before by the caller. If 278 zalloc and zfree are set to Z_NULL, deflateInit updates them to use default 279 allocation functions. 280 281 The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9: 282 1 gives best speed, 9 gives best compression, 0 gives no compression at all 283 (the input data is simply copied a block at a time). Z_DEFAULT_COMPRESSION 284 requests a default compromise between speed and compression (currently 285 equivalent to level 6). 286 287 deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough 288 memory, Z_STREAM_ERROR if level is not a valid compression level, or 289 Z_VERSION_ERROR if the zlib library version (zlib_version) is incompatible 290 with the version assumed by the caller (ZLIB_VERSION). msg is set to null 291 if there is no error message. deflateInit does not perform any compression: 292 this will be done by deflate(). 293 */ 294 295 296 ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush)); 297 /* 298 deflate compresses as much data as possible, and stops when the input 299 buffer becomes empty or the output buffer becomes full. It may introduce 300 some output latency (reading input without producing any output) except when 301 forced to flush. 302 303 The detailed semantics are as follows. deflate performs one or both of the 304 following actions: 305 306 - Compress more input starting at next_in and update next_in and avail_in 307 accordingly. If not all input can be processed (because there is not 308 enough room in the output buffer), next_in and avail_in are updated and 309 processing will resume at this point for the next call of deflate(). 310 311 - Provide more output starting at next_out and update next_out and avail_out 312 accordingly. This action is forced if the parameter flush is non zero. 313 Forcing flush frequently degrades the compression ratio, so this parameter 314 should be set only when necessary (in interactive applications). Some 315 output may be provided even if flush is not set. 316 317 Before the call of deflate(), the application should ensure that at least 318 one of the actions is possible, by providing more input and/or consuming more 319 output, and updating avail_in or avail_out accordingly; avail_out should 320 never be zero before the call. The application can consume the compressed 321 output when it wants, for example when the output buffer is full (avail_out 322 == 0), or after each call of deflate(). If deflate returns Z_OK and with 323 zero avail_out, it must be called again after making room in the output 324 buffer because there might be more output pending. 325 326 Normally the parameter flush is set to Z_NO_FLUSH, which allows deflate to 327 decide how much data to accumulate before producing output, in order to 328 maximize compression. 329 330 If the parameter flush is set to Z_SYNC_FLUSH, all pending output is 331 flushed to the output buffer and the output is aligned on a byte boundary, so 332 that the decompressor can get all input data available so far. (In 333 particular avail_in is zero after the call if enough output space has been 334 provided before the call.) Flushing may degrade compression for some 335 compression algorithms and so it should be used only when necessary. This 336 completes the current deflate block and follows it with an empty stored block 337 that is three bits plus filler bits to the next byte, followed by four bytes 338 (00 00 ff ff). 339 340 If flush is set to Z_PARTIAL_FLUSH, all pending output is flushed to the 341 output buffer, but the output is not aligned to a byte boundary. All of the 342 input data so far will be available to the decompressor, as for Z_SYNC_FLUSH. 343 This completes the current deflate block and follows it with an empty fixed 344 codes block that is 10 bits long. This assures that enough bytes are output 345 in order for the decompressor to finish the block before the empty fixed code 346 block. 347 348 If flush is set to Z_BLOCK, a deflate block is completed and emitted, as 349 for Z_SYNC_FLUSH, but the output is not aligned on a byte boundary, and up to 350 seven bits of the current block are held to be written as the next byte after 351 the next deflate block is completed. In this case, the decompressor may not 352 be provided enough bits at this point in order to complete decompression of 353 the data provided so far to the compressor. It may need to wait for the next 354 block to be emitted. This is for advanced applications that need to control 355 the emission of deflate blocks. 356 357 If flush is set to Z_FULL_FLUSH, all output is flushed as with 358 Z_SYNC_FLUSH, and the compression state is reset so that decompression can 359 restart from this point if previous compressed data has been damaged or if 360 random access is desired. Using Z_FULL_FLUSH too often can seriously degrade 361 compression. 362 363 If deflate returns with avail_out == 0, this function must be called again 364 with the same value of the flush parameter and more output space (updated 365 avail_out), until the flush is complete (deflate returns with non-zero 366 avail_out). In the case of a Z_FULL_FLUSH or Z_SYNC_FLUSH, make sure that 367 avail_out is greater than six to avoid repeated flush markers due to 368 avail_out == 0 on return. 369 370 If the parameter flush is set to Z_FINISH, pending input is processed, 371 pending output is flushed and deflate returns with Z_STREAM_END if there was 372 enough output space; if deflate returns with Z_OK, this function must be 373 called again with Z_FINISH and more output space (updated avail_out) but no 374 more input data, until it returns with Z_STREAM_END or an error. After 375 deflate has returned Z_STREAM_END, the only possible operations on the stream 376 are deflateReset or deflateEnd. 377 378 Z_FINISH can be used immediately after deflateInit if all the compression 379 is to be done in a single step. In this case, avail_out must be at least the 380 value returned by deflateBound (see below). If deflate does not return 381 Z_STREAM_END, then it must be called again as described above. 382 383 deflate() sets strm->adler to the adler32 checksum of all input read 384 so far (that is, total_in bytes). 385 386 deflate() may update strm->data_type if it can make a good guess about 387 the input data type (Z_BINARY or Z_TEXT). In doubt, the data is considered 388 binary. This field is only for information purposes and does not affect the 389 compression algorithm in any manner. 390 391 deflate() returns Z_OK if some progress has been made (more input 392 processed or more output produced), Z_STREAM_END if all input has been 393 consumed and all output has been produced (only when flush is set to 394 Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example 395 if next_in or next_out was Z_NULL), Z_BUF_ERROR if no progress is possible 396 (for example avail_in or avail_out was zero). Note that Z_BUF_ERROR is not 397 fatal, and deflate() can be called again with more input and more output 398 space to continue compressing. 399 */ 400 401 402 ZEXTERN int ZEXPORT deflateEnd OF((z_streamp strm)); 403 /* 404 All dynamically allocated data structures for this stream are freed. 405 This function discards any unprocessed input and does not flush any pending 406 output. 407 408 deflateEnd returns Z_OK if success, Z_STREAM_ERROR if the 409 stream state was inconsistent, Z_DATA_ERROR if the stream was freed 410 prematurely (some input or output was discarded). In the error case, msg 411 may be set but then points to a static string (which must not be 412 deallocated). 413 */ 414 415 416 /* 417 ZEXTERN int ZEXPORT inflateInit OF((z_streamp strm)); 418 419 Initializes the internal stream state for decompression. The fields 420 next_in, avail_in, zalloc, zfree and opaque must be initialized before by 421 the caller. If next_in is not Z_NULL and avail_in is large enough (the 422 exact value depends on the compression method), inflateInit determines the 423 compression method from the zlib header and allocates all data structures 424 accordingly; otherwise the allocation will be deferred to the first call of 425 inflate. If zalloc and zfree are set to Z_NULL, inflateInit updates them to 426 use default allocation functions. 427 428 inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough 429 memory, Z_VERSION_ERROR if the zlib library version is incompatible with the 430 version assumed by the caller, or Z_STREAM_ERROR if the parameters are 431 invalid, such as a null pointer to the structure. msg is set to null if 432 there is no error message. inflateInit does not perform any decompression 433 apart from possibly reading the zlib header if present: actual decompression 434 will be done by inflate(). (So next_in and avail_in may be modified, but 435 next_out and avail_out are unused and unchanged.) The current implementation 436 of inflateInit() does not process any header information -- that is deferred 437 until inflate() is called. 438 */ 439 440 441 ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush)); 442 /* 443 inflate decompresses as much data as possible, and stops when the input 444 buffer becomes empty or the output buffer becomes full. It may introduce 445 some output latency (reading input without producing any output) except when 446 forced to flush. 447 448 The detailed semantics are as follows. inflate performs one or both of the 449 following actions: 450 451 - Decompress more input starting at next_in and update next_in and avail_in 452 accordingly. If not all input can be processed (because there is not 453 enough room in the output buffer), next_in is updated and processing will 454 resume at this point for the next call of inflate(). 455 456 - Provide more output starting at next_out and update next_out and avail_out 457 accordingly. inflate() provides as much output as possible, until there is 458 no more input data or no more space in the output buffer (see below about 459 the flush parameter). 460 461 Before the call of inflate(), the application should ensure that at least 462 one of the actions is possible, by providing more input and/or consuming more 463 output, and updating the next_* and avail_* values accordingly. The 464 application can consume the uncompressed output when it wants, for example 465 when the output buffer is full (avail_out == 0), or after each call of 466 inflate(). If inflate returns Z_OK and with zero avail_out, it must be 467 called again after making room in the output buffer because there might be 468 more output pending. 469 470 The flush parameter of inflate() can be Z_NO_FLUSH, Z_SYNC_FLUSH, Z_FINISH, 471 Z_BLOCK, or Z_TREES. Z_SYNC_FLUSH requests that inflate() flush as much 472 output as possible to the output buffer. Z_BLOCK requests that inflate() 473 stop if and when it gets to the next deflate block boundary. When decoding 474 the zlib or gzip format, this will cause inflate() to return immediately 475 after the header and before the first block. When doing a raw inflate, 476 inflate() will go ahead and process the first block, and will return when it 477 gets to the end of that block, or when it runs out of data. 478 479 The Z_BLOCK option assists in appending to or combining deflate streams. 480 Also to assist in this, on return inflate() will set strm->data_type to the 481 number of unused bits in the last byte taken from strm->next_in, plus 64 if 482 inflate() is currently decoding the last block in the deflate stream, plus 483 128 if inflate() returned immediately after decoding an end-of-block code or 484 decoding the complete header up to just before the first byte of the deflate 485 stream. The end-of-block will not be indicated until all of the uncompressed 486 data from that block has been written to strm->next_out. The number of 487 unused bits may in general be greater than seven, except when bit 7 of 488 data_type is set, in which case the number of unused bits will be less than 489 eight. data_type is set as noted here every time inflate() returns for all 490 flush options, and so can be used to determine the amount of currently 491 consumed input in bits. 492 493 The Z_TREES option behaves as Z_BLOCK does, but it also returns when the 494 end of each deflate block header is reached, before any actual data in that 495 block is decoded. This allows the caller to determine the length of the 496 deflate block header for later use in random access within a deflate block. 497 256 is added to the value of strm->data_type when inflate() returns 498 immediately after reaching the end of the deflate block header. 499 500 inflate() should normally be called until it returns Z_STREAM_END or an 501 error. However if all decompression is to be performed in a single step (a 502 single call of inflate), the parameter flush should be set to Z_FINISH. In 503 this case all pending input is processed and all pending output is flushed; 504 avail_out must be large enough to hold all the uncompressed data. (The size 505 of the uncompressed data may have been saved by the compressor for this 506 purpose.) The next operation on this stream must be inflateEnd to deallocate 507 the decompression state. The use of Z_FINISH is never required, but can be 508 used to inform inflate that a faster approach may be used for the single 509 inflate() call. 510 511 In this implementation, inflate() always flushes as much output as 512 possible to the output buffer, and always uses the faster approach on the 513 first call. So the only effect of the flush parameter in this implementation 514 is on the return value of inflate(), as noted below, or when it returns early 515 because Z_BLOCK or Z_TREES is used. 516 517 If a preset dictionary is needed after this call (see inflateSetDictionary 518 below), inflate sets strm->adler to the adler32 checksum of the dictionary 519 chosen by the compressor and returns Z_NEED_DICT; otherwise it sets 520 strm->adler to the adler32 checksum of all output produced so far (that is, 521 total_out bytes) and returns Z_OK, Z_STREAM_END or an error code as described 522 below. At the end of the stream, inflate() checks that its computed adler32 523 checksum is equal to that saved by the compressor and returns Z_STREAM_END 524 only if the checksum is correct. 525 526 inflate() can decompress and check either zlib-wrapped or gzip-wrapped 527 deflate data. The header type is detected automatically, if requested when 528 initializing with inflateInit2(). Any information contained in the gzip 529 header is not retained, so applications that need that information should 530 instead use raw inflate, see inflateInit2() below, or inflateBack() and 531 perform their own processing of the gzip header and trailer. 532 533 inflate() returns Z_OK if some progress has been made (more input processed 534 or more output produced), Z_STREAM_END if the end of the compressed data has 535 been reached and all uncompressed output has been produced, Z_NEED_DICT if a 536 preset dictionary is needed at this point, Z_DATA_ERROR if the input data was 537 corrupted (input stream not conforming to the zlib format or incorrect check 538 value), Z_STREAM_ERROR if the stream structure was inconsistent (for example 539 next_in or next_out was Z_NULL), Z_MEM_ERROR if there was not enough memory, 540 Z_BUF_ERROR if no progress is possible or if there was not enough room in the 541 output buffer when Z_FINISH is used. Note that Z_BUF_ERROR is not fatal, and 542 inflate() can be called again with more input and more output space to 543 continue decompressing. If Z_DATA_ERROR is returned, the application may 544 then call inflateSync() to look for a good compression block if a partial 545 recovery of the data is desired. 546 */ 547 548 549 ZEXTERN int ZEXPORT inflateEnd OF((z_streamp strm)); 550 /* 551 All dynamically allocated data structures for this stream are freed. 552 This function discards any unprocessed input and does not flush any pending 553 output. 554 555 inflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state 556 was inconsistent. In the error case, msg may be set but then points to a 557 static string (which must not be deallocated). 558 */ 559 560 561 /* Advanced functions */ 562 563 /* 564 The following functions are needed only in some special applications. 565 */ 566 567 /* 568 ZEXTERN int ZEXPORT deflateInit2 OF((z_streamp strm, 569 int level, 570 int method, 571 int windowBits, 572 int memLevel, 573 int strategy)); 574 575 This is another version of deflateInit with more compression options. The 576 fields next_in, zalloc, zfree and opaque must be initialized before by the 577 caller. 578 579 The method parameter is the compression method. It must be Z_DEFLATED in 580 this version of the library. 581 582 The windowBits parameter is the base two logarithm of the window size 583 (the size of the history buffer). It should be in the range 8..15 for this 584 version of the library. Larger values of this parameter result in better 585 compression at the expense of memory usage. The default value is 15 if 586 deflateInit is used instead. 587 588 windowBits can also be -8..-15 for raw deflate. In this case, -windowBits 589 determines the window size. deflate() will then generate raw deflate data 590 with no zlib header or trailer, and will not compute an adler32 check value. 591 592 windowBits can also be greater than 15 for optional gzip encoding. Add 593 16 to windowBits to write a simple gzip header and trailer around the 594 compressed data instead of a zlib wrapper. The gzip header will have no 595 file name, no extra data, no comment, no modification time (set to zero), no 596 header crc, and the operating system will be set to 255 (unknown). If a 597 gzip stream is being written, strm->adler is a crc32 instead of an adler32. 598 599 The memLevel parameter specifies how much memory should be allocated 600 for the internal compression state. memLevel=1 uses minimum memory but is 601 slow and reduces compression ratio; memLevel=9 uses maximum memory for 602 optimal speed. The default value is 8. See zconf.h for total memory usage 603 as a function of windowBits and memLevel. 604 605 The strategy parameter is used to tune the compression algorithm. Use the 606 value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data produced by a 607 filter (or predictor), Z_HUFFMAN_ONLY to force Huffman encoding only (no 608 string match), or Z_RLE to limit match distances to one (run-length 609 encoding). Filtered data consists mostly of small values with a somewhat 610 random distribution. In this case, the compression algorithm is tuned to 611 compress them better. The effect of Z_FILTERED is to force more Huffman 612 coding and less string matching; it is somewhat intermediate between 613 Z_DEFAULT_STRATEGY and Z_HUFFMAN_ONLY. Z_RLE is designed to be almost as 614 fast as Z_HUFFMAN_ONLY, but give better compression for PNG image data. The 615 strategy parameter only affects the compression ratio but not the 616 correctness of the compressed output even if it is not set appropriately. 617 Z_FIXED prevents the use of dynamic Huffman codes, allowing for a simpler 618 decoder for special applications. 619 620 deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough 621 memory, Z_STREAM_ERROR if any parameter is invalid (such as an invalid 622 method), or Z_VERSION_ERROR if the zlib library version (zlib_version) is 623 incompatible with the version assumed by the caller (ZLIB_VERSION). msg is 624 set to null if there is no error message. deflateInit2 does not perform any 625 compression: this will be done by deflate(). 626 */ 627 628 ZEXTERN int ZEXPORT deflateSetDictionary OF((z_streamp strm, 629 const Bytef *dictionary, 630 uInt dictLength)); 631 /* 632 Initializes the compression dictionary from the given byte sequence 633 without producing any compressed output. This function must be called 634 immediately after deflateInit, deflateInit2 or deflateReset, before any call 635 of deflate. The compressor and decompressor must use exactly the same 636 dictionary (see inflateSetDictionary). 637 638 The dictionary should consist of strings (byte sequences) that are likely 639 to be encountered later in the data to be compressed, with the most commonly 640 used strings preferably put towards the end of the dictionary. Using a 641 dictionary is most useful when the data to be compressed is short and can be 642 predicted with good accuracy; the data can then be compressed better than 643 with the default empty dictionary. 644 645 Depending on the size of the compression data structures selected by 646 deflateInit or deflateInit2, a part of the dictionary may in effect be 647 discarded, for example if the dictionary is larger than the window size 648 provided in deflateInit or deflateInit2. Thus the strings most likely to be 649 useful should be put at the end of the dictionary, not at the front. In 650 addition, the current implementation of deflate will use at most the window 651 size minus 262 bytes of the provided dictionary. 652 653 Upon return of this function, strm->adler is set to the adler32 value 654 of the dictionary; the decompressor may later use this value to determine 655 which dictionary has been used by the compressor. (The adler32 value 656 applies to the whole dictionary even if only a subset of the dictionary is 657 actually used by the compressor.) If a raw deflate was requested, then the 658 adler32 value is not computed and strm->adler is not set. 659 660 deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a 661 parameter is invalid (e.g. dictionary being Z_NULL) or the stream state is 662 inconsistent (for example if deflate has already been called for this stream 663 or if the compression method is bsort). deflateSetDictionary does not 664 perform any compression: this will be done by deflate(). 665 */ 666 667 ZEXTERN int ZEXPORT deflateCopy OF((z_streamp dest, 668 z_streamp source)); 669 /* 670 Sets the destination stream as a complete copy of the source stream. 671 672 This function can be useful when several compression strategies will be 673 tried, for example when there are several ways of pre-processing the input 674 data with a filter. The streams that will be discarded should then be freed 675 by calling deflateEnd. Note that deflateCopy duplicates the internal 676 compression state which can be quite large, so this strategy is slow and can 677 consume lots of memory. 678 679 deflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not 680 enough memory, Z_STREAM_ERROR if the source stream state was inconsistent 681 (such as zalloc being Z_NULL). msg is left unchanged in both source and 682 destination. 683 */ 684 685 ZEXTERN int ZEXPORT deflateReset OF((z_streamp strm)); 686 /* 687 This function is equivalent to deflateEnd followed by deflateInit, 688 but does not free and reallocate all the internal compression state. The 689 stream will keep the same compression level and any other attributes that 690 may have been set by deflateInit2. 691 692 deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source 693 stream state was inconsistent (such as zalloc or state being Z_NULL). 694 */ 695 696 ZEXTERN int ZEXPORT deflateParams OF((z_streamp strm, 697 int level, 698 int strategy)); 699 /* 700 Dynamically update the compression level and compression strategy. The 701 interpretation of level and strategy is as in deflateInit2. This can be 702 used to switch between compression and straight copy of the input data, or 703 to switch to a different kind of input data requiring a different strategy. 704 If the compression level is changed, the input available so far is 705 compressed with the old level (and may be flushed); the new level will take 706 effect only at the next call of deflate(). 707 708 Before the call of deflateParams, the stream state must be set as for 709 a call of deflate(), since the currently available input may have to be 710 compressed and flushed. In particular, strm->avail_out must be non-zero. 711 712 deflateParams returns Z_OK if success, Z_STREAM_ERROR if the source 713 stream state was inconsistent or if a parameter was invalid, Z_BUF_ERROR if 714 strm->avail_out was zero. 715 */ 716 717 ZEXTERN int ZEXPORT deflateTune OF((z_streamp strm, 718 int good_length, 719 int max_lazy, 720 int nice_length, 721 int max_chain)); 722 /* 723 Fine tune deflate's internal compression parameters. This should only be 724 used by someone who understands the algorithm used by zlib's deflate for 725 searching for the best matching string, and even then only by the most 726 fanatic optimizer trying to squeeze out the last compressed bit for their 727 specific input data. Read the deflate.c source code for the meaning of the 728 max_lazy, good_length, nice_length, and max_chain parameters. 729 730 deflateTune() can be called after deflateInit() or deflateInit2(), and 731 returns Z_OK on success, or Z_STREAM_ERROR for an invalid deflate stream. 732 */ 733 734 ZEXTERN uLong ZEXPORT deflateBound OF((z_streamp strm, 735 uLong sourceLen)); 736 /* 737 deflateBound() returns an upper bound on the compressed size after 738 deflation of sourceLen bytes. It must be called after deflateInit() or 739 deflateInit2(), and after deflateSetHeader(), if used. This would be used 740 to allocate an output buffer for deflation in a single pass, and so would be 741 called before deflate(). 742 */ 743 744 ZEXTERN int ZEXPORT deflatePrime OF((z_streamp strm, 745 int bits, 746 int value)); 747 /* 748 deflatePrime() inserts bits in the deflate output stream. The intent 749 is that this function is used to start off the deflate output with the bits 750 leftover from a previous deflate stream when appending to it. As such, this 751 function can only be used for raw deflate, and must be used before the first 752 deflate() call after a deflateInit2() or deflateReset(). bits must be less 753 than or equal to 16, and that many of the least significant bits of value 754 will be inserted in the output. 755 756 deflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source 757 stream state was inconsistent. 758 */ 759 760 ZEXTERN int ZEXPORT deflateSetHeader OF((z_streamp strm, 761 gz_headerp head)); 762 /* 763 deflateSetHeader() provides gzip header information for when a gzip 764 stream is requested by deflateInit2(). deflateSetHeader() may be called 765 after deflateInit2() or deflateReset() and before the first call of 766 deflate(). The text, time, os, extra field, name, and comment information 767 in the provided gz_header structure are written to the gzip header (xflag is 768 ignored -- the extra flags are set according to the compression level). The 769 caller must assure that, if not Z_NULL, name and comment are terminated with 770 a zero byte, and that if extra is not Z_NULL, that extra_len bytes are 771 available there. If hcrc is true, a gzip header crc is included. Note that 772 the current versions of the command-line version of gzip (up through version 773 1.3.x) do not support header crc's, and will report that it is a "multi-part 774 gzip file" and give up. 775 776 If deflateSetHeader is not used, the default gzip header has text false, 777 the time set to zero, and os set to 255, with no extra, name, or comment 778 fields. The gzip header is returned to the default state by deflateReset(). 779 780 deflateSetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source 781 stream state was inconsistent. 782 */ 783 784 /* 785 ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm, 786 int windowBits)); 787 788 This is another version of inflateInit with an extra parameter. The 789 fields next_in, avail_in, zalloc, zfree and opaque must be initialized 790 before by the caller. 791 792 The windowBits parameter is the base two logarithm of the maximum window 793 size (the size of the history buffer). It should be in the range 8..15 for 794 this version of the library. The default value is 15 if inflateInit is used 795 instead. windowBits must be greater than or equal to the windowBits value 796 provided to deflateInit2() while compressing, or it must be equal to 15 if 797 deflateInit2() was not used. If a compressed stream with a larger window 798 size is given as input, inflate() will return with the error code 799 Z_DATA_ERROR instead of trying to allocate a larger window. 800 801 windowBits can also be zero to request that inflate use the window size in 802 the zlib header of the compressed stream. 803 804 windowBits can also be -8..-15 for raw inflate. In this case, -windowBits 805 determines the window size. inflate() will then process raw deflate data, 806 not looking for a zlib or gzip header, not generating a check value, and not 807 looking for any check values for comparison at the end of the stream. This 808 is for use with other formats that use the deflate compressed data format 809 such as zip. Those formats provide their own check values. If a custom 810 format is developed using the raw deflate format for compressed data, it is 811 recommended that a check value such as an adler32 or a crc32 be applied to 812 the uncompressed data as is done in the zlib, gzip, and zip formats. For 813 most applications, the zlib format should be used as is. Note that comments 814 above on the use in deflateInit2() applies to the magnitude of windowBits. 815 816 windowBits can also be greater than 15 for optional gzip decoding. Add 817 32 to windowBits to enable zlib and gzip decoding with automatic header 818 detection, or add 16 to decode only the gzip format (the zlib format will 819 return a Z_DATA_ERROR). If a gzip stream is being decoded, strm->adler is a 820 crc32 instead of an adler32. 821 822 inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough 823 memory, Z_VERSION_ERROR if the zlib library version is incompatible with the 824 version assumed by the caller, or Z_STREAM_ERROR if the parameters are 825 invalid, such as a null pointer to the structure. msg is set to null if 826 there is no error message. inflateInit2 does not perform any decompression 827 apart from possibly reading the zlib header if present: actual decompression 828 will be done by inflate(). (So next_in and avail_in may be modified, but 829 next_out and avail_out are unused and unchanged.) The current implementation 830 of inflateInit2() does not process any header information -- that is 831 deferred until inflate() is called. 832 */ 833 834 ZEXTERN int ZEXPORT inflateSetDictionary OF((z_streamp strm, 835 const Bytef *dictionary, 836 uInt dictLength)); 837 /* 838 Initializes the decompression dictionary from the given uncompressed byte 839 sequence. This function must be called immediately after a call of inflate, 840 if that call returned Z_NEED_DICT. The dictionary chosen by the compressor 841 can be determined from the adler32 value returned by that call of inflate. 842 The compressor and decompressor must use exactly the same dictionary (see 843 deflateSetDictionary). For raw inflate, this function can be called 844 immediately after inflateInit2() or inflateReset() and before any call of 845 inflate() to set the dictionary. The application must insure that the 846 dictionary that was used for compression is provided. 847 848 inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a 849 parameter is invalid (e.g. dictionary being Z_NULL) or the stream state is 850 inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the 851 expected one (incorrect adler32 value). inflateSetDictionary does not 852 perform any decompression: this will be done by subsequent calls of 853 inflate(). 854 */ 855 856 ZEXTERN int ZEXPORT inflateSync OF((z_streamp strm)); 857 /* 858 Skips invalid compressed data until a full flush point (see above the 859 description of deflate with Z_FULL_FLUSH) can be found, or until all 860 available input is skipped. No output is provided. 861 862 inflateSync returns Z_OK if a full flush point has been found, Z_BUF_ERROR 863 if no more input was provided, Z_DATA_ERROR if no flush point has been 864 found, or Z_STREAM_ERROR if the stream structure was inconsistent. In the 865 success case, the application may save the current current value of total_in 866 which indicates where valid compressed data was found. In the error case, 867 the application may repeatedly call inflateSync, providing more input each 868 time, until success or end of the input data. 869 */ 870 871 ZEXTERN int ZEXPORT inflateCopy OF((z_streamp dest, 872 z_streamp source)); 873 /* 874 Sets the destination stream as a complete copy of the source stream. 875 876 This function can be useful when randomly accessing a large stream. The 877 first pass through the stream can periodically record the inflate state, 878 allowing restarting inflate at those points when randomly accessing the 879 stream. 880 881 inflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not 882 enough memory, Z_STREAM_ERROR if the source stream state was inconsistent 883 (such as zalloc being Z_NULL). msg is left unchanged in both source and 884 destination. 885 */ 886 887 ZEXTERN int ZEXPORT inflateReset OF((z_streamp strm)); 888 /* 889 This function is equivalent to inflateEnd followed by inflateInit, 890 but does not free and reallocate all the internal decompression state. The 891 stream will keep attributes that may have been set by inflateInit2. 892 893 inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source 894 stream state was inconsistent (such as zalloc or state being Z_NULL). 895 */ 896 897 ZEXTERN int ZEXPORT inflateReset2 OF((z_streamp strm, 898 int windowBits)); 899 /* 900 This function is the same as inflateReset, but it also permits changing 901 the wrap and window size requests. The windowBits parameter is interpreted 902 the same as it is for inflateInit2. 903 904 inflateReset2 returns Z_OK if success, or Z_STREAM_ERROR if the source 905 stream state was inconsistent (such as zalloc or state being Z_NULL), or if 906 the windowBits parameter is invalid. 907 */ 908 909 ZEXTERN int ZEXPORT inflatePrime OF((z_streamp strm, 910 int bits, 911 int value)); 912 /* 913 This function inserts bits in the inflate input stream. The intent is 914 that this function is used to start inflating at a bit position in the 915 middle of a byte. The provided bits will be used before any bytes are used 916 from next_in. This function should only be used with raw inflate, and 917 should be used before the first inflate() call after inflateInit2() or 918 inflateReset(). bits must be less than or equal to 16, and that many of the 919 least significant bits of value will be inserted in the input. 920 921 If bits is negative, then the input stream bit buffer is emptied. Then 922 inflatePrime() can be called again to put bits in the buffer. This is used 923 to clear out bits leftover after feeding inflate a block description prior 924 to feeding inflate codes. 925 926 inflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source 927 stream state was inconsistent. 928 */ 929 930 ZEXTERN long ZEXPORT inflateMark OF((z_streamp strm)); 931 /* 932 This function returns two values, one in the lower 16 bits of the return 933 value, and the other in the remaining upper bits, obtained by shifting the 934 return value down 16 bits. If the upper value is -1 and the lower value is 935 zero, then inflate() is currently decoding information outside of a block. 936 If the upper value is -1 and the lower value is non-zero, then inflate is in 937 the middle of a stored block, with the lower value equaling the number of 938 bytes from the input remaining to copy. If the upper value is not -1, then 939 it is the number of bits back from the current bit position in the input of 940 the code (literal or length/distance pair) currently being processed. In 941 that case the lower value is the number of bytes already emitted for that 942 code. 943 944 A code is being processed if inflate is waiting for more input to complete 945 decoding of the code, or if it has completed decoding but is waiting for 946 more output space to write the literal or match data. 947 948 inflateMark() is used to mark locations in the input data for random 949 access, which may be at bit positions, and to note those cases where the 950 output of a code may span boundaries of random access blocks. The current 951 location in the input stream can be determined from avail_in and data_type 952 as noted in the description for the Z_BLOCK flush parameter for inflate. 953 954 inflateMark returns the value noted above or -1 << 16 if the provided 955 source stream state was inconsistent. 956 */ 957 958 ZEXTERN int ZEXPORT inflateGetHeader OF((z_streamp strm, 959 gz_headerp head)); 960 /* 961 inflateGetHeader() requests that gzip header information be stored in the 962 provided gz_header structure. inflateGetHeader() may be called after 963 inflateInit2() or inflateReset(), and before the first call of inflate(). 964 As inflate() processes the gzip stream, head->done is zero until the header 965 is completed, at which time head->done is set to one. If a zlib stream is 966 being decoded, then head->done is set to -1 to indicate that there will be 967 no gzip header information forthcoming. Note that Z_BLOCK or Z_TREES can be 968 used to force inflate() to return immediately after header processing is 969 complete and before any actual data is decompressed. 970 971 The text, time, xflags, and os fields are filled in with the gzip header 972 contents. hcrc is set to true if there is a header CRC. (The header CRC 973 was valid if done is set to one.) If extra is not Z_NULL, then extra_max 974 contains the maximum number of bytes to write to extra. Once done is true, 975 extra_len contains the actual extra field length, and extra contains the 976 extra field, or that field truncated if extra_max is less than extra_len. 977 If name is not Z_NULL, then up to name_max characters are written there, 978 terminated with a zero unless the length is greater than name_max. If 979 comment is not Z_NULL, then up to comm_max characters are written there, 980 terminated with a zero unless the length is greater than comm_max. When any 981 of extra, name, or comment are not Z_NULL and the respective field is not 982 present in the header, then that field is set to Z_NULL to signal its 983 absence. This allows the use of deflateSetHeader() with the returned 984 structure to duplicate the header. However if those fields are set to 985 allocated memory, then the application will need to save those pointers 986 elsewhere so that they can be eventually freed. 987 988 If inflateGetHeader is not used, then the header information is simply 989 discarded. The header is always checked for validity, including the header 990 CRC if present. inflateReset() will reset the process to discard the header 991 information. The application would need to call inflateGetHeader() again to 992 retrieve the header from the next gzip stream. 993 994 inflateGetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source 995 stream state was inconsistent. 996 */ 997 998 /* 999 ZEXTERN int ZEXPORT inflateBackInit OF((z_streamp strm, int windowBits, 1000 unsigned char FAR *window)); 1001 1002 Initialize the internal stream state for decompression using inflateBack() 1003 calls. The fields zalloc, zfree and opaque in strm must be initialized 1004 before the call. If zalloc and zfree are Z_NULL, then the default library- 1005 derived memory allocation routines are used. windowBits is the base two 1006 logarithm of the window size, in the range 8..15. window is a caller 1007 supplied buffer of that size. Except for special applications where it is 1008 assured that deflate was used with small window sizes, windowBits must be 15 1009 and a 32K byte window must be supplied to be able to decompress general 1010 deflate streams. 1011 1012 See inflateBack() for the usage of these routines. 1013 1014 inflateBackInit will return Z_OK on success, Z_STREAM_ERROR if any of 1015 the paramaters are invalid, Z_MEM_ERROR if the internal state could not be 1016 allocated, or Z_VERSION_ERROR if the version of the library does not match 1017 the version of the header file. 1018 */ 1019 1020 typedef unsigned (*in_func) OF((void FAR *, unsigned char FAR * FAR *)); 1021 typedef int (*out_func) OF((void FAR *, unsigned char FAR *, unsigned)); 1022 1023 ZEXTERN int ZEXPORT inflateBack OF((z_streamp strm, 1024 in_func in, void FAR *in_desc, 1025 out_func out, void FAR *out_desc)); 1026 /* 1027 inflateBack() does a raw inflate with a single call using a call-back 1028 interface for input and output. This is more efficient than inflate() for 1029 file i/o applications in that it avoids copying between the output and the 1030 sliding window by simply making the window itself the output buffer. This 1031 function trusts the application to not change the output buffer passed by 1032 the output function, at least until inflateBack() returns. 1033 1034 inflateBackInit() must be called first to allocate the internal state 1035 and to initialize the state with the user-provided window buffer. 1036 inflateBack() may then be used multiple times to inflate a complete, raw 1037 deflate stream with each call. inflateBackEnd() is then called to free the 1038 allocated state. 1039 1040 A raw deflate stream is one with no zlib or gzip header or trailer. 1041 This routine would normally be used in a utility that reads zip or gzip 1042 files and writes out uncompressed files. The utility would decode the 1043 header and process the trailer on its own, hence this routine expects only 1044 the raw deflate stream to decompress. This is different from the normal 1045 behavior of inflate(), which expects either a zlib or gzip header and 1046 trailer around the deflate stream. 1047 1048 inflateBack() uses two subroutines supplied by the caller that are then 1049 called by inflateBack() for input and output. inflateBack() calls those 1050 routines until it reads a complete deflate stream and writes out all of the 1051 uncompressed data, or until it encounters an error. The function's 1052 parameters and return types are defined above in the in_func and out_func 1053 typedefs. inflateBack() will call in(in_desc, &buf) which should return the 1054 number of bytes of provided input, and a pointer to that input in buf. If 1055 there is no input available, in() must return zero--buf is ignored in that 1056 case--and inflateBack() will return a buffer error. inflateBack() will call 1057 out(out_desc, buf, len) to write the uncompressed data buf[0..len-1]. out() 1058 should return zero on success, or non-zero on failure. If out() returns 1059 non-zero, inflateBack() will return with an error. Neither in() nor out() 1060 are permitted to change the contents of the window provided to 1061 inflateBackInit(), which is also the buffer that out() uses to write from. 1062 The length written by out() will be at most the window size. Any non-zero 1063 amount of input may be provided by in(). 1064 1065 For convenience, inflateBack() can be provided input on the first call by 1066 setting strm->next_in and strm->avail_in. If that input is exhausted, then 1067 in() will be called. Therefore strm->next_in must be initialized before 1068 calling inflateBack(). If strm->next_in is Z_NULL, then in() will be called 1069 immediately for input. If strm->next_in is not Z_NULL, then strm->avail_in 1070 must also be initialized, and then if strm->avail_in is not zero, input will 1071 initially be taken from strm->next_in[0 .. strm->avail_in - 1]. 1072 1073 The in_desc and out_desc parameters of inflateBack() is passed as the 1074 first parameter of in() and out() respectively when they are called. These 1075 descriptors can be optionally used to pass any information that the caller- 1076 supplied in() and out() functions need to do their job. 1077 1078 On return, inflateBack() will set strm->next_in and strm->avail_in to 1079 pass back any unused input that was provided by the last in() call. The 1080 return values of inflateBack() can be Z_STREAM_END on success, Z_BUF_ERROR 1081 if in() or out() returned an error, Z_DATA_ERROR if there was a format error 1082 in the deflate stream (in which case strm->msg is set to indicate the nature 1083 of the error), or Z_STREAM_ERROR if the stream was not properly initialized. 1084 In the case of Z_BUF_ERROR, an input or output error can be distinguished 1085 using strm->next_in which will be Z_NULL only if in() returned an error. If 1086 strm->next_in is not Z_NULL, then the Z_BUF_ERROR was due to out() returning 1087 non-zero. (in() will always be called before out(), so strm->next_in is 1088 assured to be defined if out() returns non-zero.) Note that inflateBack() 1089 cannot return Z_OK. 1090 */ 1091 1092 ZEXTERN int ZEXPORT inflateBackEnd OF((z_streamp strm)); 1093 /* 1094 All memory allocated by inflateBackInit() is freed. 1095 1096 inflateBackEnd() returns Z_OK on success, or Z_STREAM_ERROR if the stream 1097 state was inconsistent. 1098 */ 1099 1100 ZEXTERN uLong ZEXPORT zlibCompileFlags OF((void)); 1101 /* Return flags indicating compile-time options. 1102 1103 Type sizes, two bits each, 00 = 16 bits, 01 = 32, 10 = 64, 11 = other: 1104 1.0: size of uInt 1105 3.2: size of uLong 1106 5.4: size of voidpf (pointer) 1107 7.6: size of z_off_t 1108 1109 Compiler, assembler, and debug options: 1110 8: DEBUG 1111 9: ASMV or ASMINF -- use ASM code 1112 10: ZLIB_WINAPI -- exported functions use the WINAPI calling convention 1113 11: 0 (reserved) 1114 1115 One-time table building (smaller code, but not thread-safe if true): 1116 12: BUILDFIXED -- build static block decoding tables when needed 1117 13: DYNAMIC_CRC_TABLE -- build CRC calculation tables when needed 1118 14,15: 0 (reserved) 1119 1120 Library content (indicates missing functionality): 1121 16: NO_GZCOMPRESS -- gz* functions cannot compress (to avoid linking 1122 deflate code when not needed) 1123 17: NO_GZIP -- deflate can't write gzip streams, and inflate can't detect 1124 and decode gzip streams (to avoid linking crc code) 1125 18-19: 0 (reserved) 1126 1127 Operation variations (changes in library functionality): 1128 20: PKZIP_BUG_WORKAROUND -- slightly more permissive inflate 1129 21: FASTEST -- deflate algorithm with only one, lowest compression level 1130 22,23: 0 (reserved) 1131 1132 The sprintf variant used by gzprintf (zero is best): 1133 24: 0 = vs*, 1 = s* -- 1 means limited to 20 arguments after the format 1134 25: 0 = *nprintf, 1 = *printf -- 1 means gzprintf() not secure! 1135 26: 0 = returns value, 1 = void -- 1 means inferred string length returned 1136 1137 Remainder: 1138 27-31: 0 (reserved) 1139 */ 1140 1141 1142 /* utility functions */ 1143 1144 /* 1145 The following utility functions are implemented on top of the basic 1146 stream-oriented functions. To simplify the interface, some default options 1147 are assumed (compression level and memory usage, standard memory allocation 1148 functions). The source code of these utility functions can be modified if 1149 you need special options. 1150 */ 1151 1152 ZEXTERN int ZEXPORT compress OF((Bytef *dest, uLongf *destLen, 1153 const Bytef *source, uLong sourceLen)); 1154 /* 1155 Compresses the source buffer into the destination buffer. sourceLen is 1156 the byte length of the source buffer. Upon entry, destLen is the total size 1157 of the destination buffer, which must be at least the value returned by 1158 compressBound(sourceLen). Upon exit, destLen is the actual size of the 1159 compressed buffer. 1160 1161 compress returns Z_OK if success, Z_MEM_ERROR if there was not 1162 enough memory, Z_BUF_ERROR if there was not enough room in the output 1163 buffer. 1164 */ 1165 1166 ZEXTERN int ZEXPORT compress2 OF((Bytef *dest, uLongf *destLen, 1167 const Bytef *source, uLong sourceLen, 1168 int level)); 1169 /* 1170 Compresses the source buffer into the destination buffer. The level 1171 parameter has the same meaning as in deflateInit. sourceLen is the byte 1172 length of the source buffer. Upon entry, destLen is the total size of the 1173 destination buffer, which must be at least the value returned by 1174 compressBound(sourceLen). Upon exit, destLen is the actual size of the 1175 compressed buffer. 1176 1177 compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough 1178 memory, Z_BUF_ERROR if there was not enough room in the output buffer, 1179 Z_STREAM_ERROR if the level parameter is invalid. 1180 */ 1181 1182 ZEXTERN uLong ZEXPORT compressBound OF((uLong sourceLen)); 1183 /* 1184 compressBound() returns an upper bound on the compressed size after 1185 compress() or compress2() on sourceLen bytes. It would be used before a 1186 compress() or compress2() call to allocate the destination buffer. 1187 */ 1188 1189 ZEXTERN int ZEXPORT uncompress OF((Bytef *dest, uLongf *destLen, 1190 const Bytef *source, uLong sourceLen)); 1191 /* 1192 Decompresses the source buffer into the destination buffer. sourceLen is 1193 the byte length of the source buffer. Upon entry, destLen is the total size 1194 of the destination buffer, which must be large enough to hold the entire 1195 uncompressed data. (The size of the uncompressed data must have been saved 1196 previously by the compressor and transmitted to the decompressor by some 1197 mechanism outside the scope of this compression library.) Upon exit, destLen 1198 is the actual size of the uncompressed buffer. 1199 1200 uncompress returns Z_OK if success, Z_MEM_ERROR if there was not 1201 enough memory, Z_BUF_ERROR if there was not enough room in the output 1202 buffer, or Z_DATA_ERROR if the input data was corrupted or incomplete. 1203 */ 1204 1205 1206 /* gzip file access functions */ 1207 1208 /* 1209 This library supports reading and writing files in gzip (.gz) format with 1210 an interface similar to that of stdio, using the functions that start with 1211 "gz". The gzip format is different from the zlib format. gzip is a gzip 1212 wrapper, documented in RFC 1952, wrapped around a deflate stream. 1213 */ 1214 1215 typedef voidp gzFile; /* opaque gzip file descriptor */ 1216 1217 /* 1218 ZEXTERN gzFile ZEXPORT gzopen OF((const char *path, const char *mode)); 1219 1220 Opens a gzip (.gz) file for reading or writing. The mode parameter is as 1221 in fopen ("rb" or "wb") but can also include a compression level ("wb9") or 1222 a strategy: 'f' for filtered data as in "wb6f", 'h' for Huffman-only 1223 compression as in "wb1h", 'R' for run-length encoding as in "wb1R", or 'F' 1224 for fixed code compression as in "wb9F". (See the description of 1225 deflateInit2 for more information about the strategy parameter.) Also "a" 1226 can be used instead of "w" to request that the gzip stream that will be 1227 written be appended to the file. "+" will result in an error, since reading 1228 and writing to the same gzip file is not supported. 1229 1230 gzopen can be used to read a file which is not in gzip format; in this 1231 case gzread will directly read from the file without decompression. 1232 1233 gzopen returns NULL if the file could not be opened, if there was 1234 insufficient memory to allocate the gzFile state, or if an invalid mode was 1235 specified (an 'r', 'w', or 'a' was not provided, or '+' was provided). 1236 errno can be checked to determine if the reason gzopen failed was that the 1237 file could not be opened. 1238 */ 1239 1240 ZEXTERN gzFile ZEXPORT gzdopen OF((int fd, const char *mode)); 1241 /* 1242 gzdopen associates a gzFile with the file descriptor fd. File descriptors 1243 are obtained from calls like open, dup, creat, pipe or fileno (if the file 1244 has been previously opened with fopen). The mode parameter is as in gzopen. 1245 1246 The next call of gzclose on the returned gzFile will also close the file 1247 descriptor fd, just like fclose(fdopen(fd, mode)) closes the file descriptor 1248 fd. If you want to keep fd open, use fd = dup(fd_keep); gz = gzdopen(fd, 1249 mode);. The duplicated descriptor should be saved to avoid a leak, since 1250 gzdopen does not close fd if it fails. 1251 1252 gzdopen returns NULL if there was insufficient memory to allocate the 1253 gzFile state, if an invalid mode was specified (an 'r', 'w', or 'a' was not 1254 provided, or '+' was provided), or if fd is -1. The file descriptor is not 1255 used until the next gz* read, write, seek, or close operation, so gzdopen 1256 will not detect if fd is invalid (unless fd is -1). 1257 */ 1258 1259 ZEXTERN int ZEXPORT gzbuffer OF((gzFile file, unsigned size)); 1260 /* 1261 Set the internal buffer size used by this library's functions. The 1262 default buffer size is 8192 bytes. This function must be called after 1263 gzopen() or gzdopen(), and before any other calls that read or write the 1264 file. The buffer memory allocation is always deferred to the first read or 1265 write. Two buffers are allocated, either both of the specified size when 1266 writing, or one of the specified size and the other twice that size when 1267 reading. A larger buffer size of, for example, 64K or 128K bytes will 1268 noticeably increase the speed of decompression (reading). 1269 1270 The new buffer size also affects the maximum length for gzprintf(). 1271 1272 gzbuffer() returns 0 on success, or -1 on failure, such as being called 1273 too late. 1274 */ 1275 1276 ZEXTERN int ZEXPORT gzsetparams OF((gzFile file, int level, int strategy)); 1277 /* 1278 Dynamically update the compression level or strategy. See the description 1279 of deflateInit2 for the meaning of these parameters. 1280 1281 gzsetparams returns Z_OK if success, or Z_STREAM_ERROR if the file was not 1282 opened for writing. 1283 */ 1284 1285 ZEXTERN int ZEXPORT gzread OF((gzFile file, voidp buf, unsigned len)); 1286 /* 1287 Reads the given number of uncompressed bytes from the compressed file. If 1288 the input file was not in gzip format, gzread copies the given number of 1289 bytes into the buffer. 1290 1291 After reaching the end of a gzip stream in the input, gzread will continue 1292 to read, looking for another gzip stream, or failing that, reading the rest 1293 of the input file directly without decompression. The entire input file 1294 will be read if gzread is called until it returns less than the requested 1295 len. 1296 1297 gzread returns the number of uncompressed bytes actually read, less than 1298 len for end of file, or -1 for error. 1299 */ 1300 1301 ZEXTERN int ZEXPORT gzwrite OF((gzFile file, 1302 voidpc buf, unsigned len)); 1303 /* 1304 Writes the given number of uncompressed bytes into the compressed file. 1305 gzwrite returns the number of uncompressed bytes written or 0 in case of 1306 error. 1307 */ 1308 1309 ZEXTERN int ZEXPORTVA gzprintf OF((gzFile file, const char *format, ...)); 1310 /* 1311 Converts, formats, and writes the arguments to the compressed file under 1312 control of the format string, as in fprintf. gzprintf returns the number of 1313 uncompressed bytes actually written, or 0 in case of error. The number of 1314 uncompressed bytes written is limited to 8191, or one less than the buffer 1315 size given to gzbuffer(). The caller should assure that this limit is not 1316 exceeded. If it is exceeded, then gzprintf() will return an error (0) with 1317 nothing written. In this case, there may also be a buffer overflow with 1318 unpredictable consequences, which is possible only if zlib was compiled with 1319 the insecure functions sprintf() or vsprintf() because the secure snprintf() 1320 or vsnprintf() functions were not available. This can be determined using 1321 zlibCompileFlags(). 1322 */ 1323 1324 ZEXTERN int ZEXPORT gzputs OF((gzFile file, const char *s)); 1325 /* 1326 Writes the given null-terminated string to the compressed file, excluding 1327 the terminating null character. 1328 1329 gzputs returns the number of characters written, or -1 in case of error. 1330 */ 1331 1332 ZEXTERN char * ZEXPORT gzgets OF((gzFile file, char *buf, int len)); 1333 /* 1334 Reads bytes from the compressed file until len-1 characters are read, or a 1335 newline character is read and transferred to buf, or an end-of-file 1336 condition is encountered. If any characters are read or if len == 1, the 1337 string is terminated with a null character. If no characters are read due 1338 to an end-of-file or len < 1, then the buffer is left untouched. 1339 1340 gzgets returns buf which is a null-terminated string, or it returns NULL 1341 for end-of-file or in case of error. If there was an error, the contents at 1342 buf are indeterminate. 1343 */ 1344 1345 ZEXTERN int ZEXPORT gzputc OF((gzFile file, int c)); 1346 /* 1347 Writes c, converted to an unsigned char, into the compressed file. gzputc 1348 returns the value that was written, or -1 in case of error. 1349 */ 1350 1351 ZEXTERN int ZEXPORT gzgetc OF((gzFile file)); 1352 /* 1353 Reads one byte from the compressed file. gzgetc returns this byte or -1 1354 in case of end of file or error. 1355 */ 1356 1357 ZEXTERN int ZEXPORT gzungetc OF((int c, gzFile file)); 1358 /* 1359 Push one character back onto the stream to be read as the first character 1360 on the next read. At least one character of push-back is allowed. 1361 gzungetc() returns the character pushed, or -1 on failure. gzungetc() will 1362 fail if c is -1, and may fail if a character has been pushed but not read 1363 yet. If gzungetc is used immediately after gzopen or gzdopen, at least the 1364 output buffer size of pushed characters is allowed. (See gzbuffer above.) 1365 The pushed character will be discarded if the stream is repositioned with 1366 gzseek() or gzrewind(). 1367 */ 1368 1369 ZEXTERN int ZEXPORT gzflush OF((gzFile file, int flush)); 1370 /* 1371 Flushes all pending output into the compressed file. The parameter flush 1372 is as in the deflate() function. The return value is the zlib error number 1373 (see function gzerror below). gzflush is only permitted when writing. 1374 1375 If the flush parameter is Z_FINISH, the remaining data is written and the 1376 gzip stream is completed in the output. If gzwrite() is called again, a new 1377 gzip stream will be started in the output. gzread() is able to read such 1378 concatented gzip streams. 1379 1380 gzflush should be called only when strictly necessary because it will 1381 degrade compression if called too often. 1382 */ 1383 1384 /* 1385 ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile file, 1386 z_off_t offset, int whence)); 1387 1388 Sets the starting position for the next gzread or gzwrite on the given 1389 compressed file. The offset represents a number of bytes in the 1390 uncompressed data stream. The whence parameter is defined as in lseek(2); 1391 the value SEEK_END is not supported. 1392 1393 If the file is opened for reading, this function is emulated but can be 1394 extremely slow. If the file is opened for writing, only forward seeks are 1395 supported; gzseek then compresses a sequence of zeroes up to the new 1396 starting position. 1397 1398 gzseek returns the resulting offset location as measured in bytes from 1399 the beginning of the uncompressed stream, or -1 in case of error, in 1400 particular if the file is opened for writing and the new starting position 1401 would be before the current position. 1402 */ 1403 1404 ZEXTERN int ZEXPORT gzrewind OF((gzFile file)); 1405 /* 1406 Rewinds the given file. This function is supported only for reading. 1407 1408 gzrewind(file) is equivalent to (int)gzseek(file, 0L, SEEK_SET) 1409 */ 1410 1411 /* 1412 ZEXTERN z_off_t ZEXPORT gztell OF((gzFile file)); 1413 1414 Returns the starting position for the next gzread or gzwrite on the given 1415 compressed file. This position represents a number of bytes in the 1416 uncompressed data stream, and is zero when starting, even if appending or 1417 reading a gzip stream from the middle of a file using gzdopen(). 1418 1419 gztell(file) is equivalent to gzseek(file, 0L, SEEK_CUR) 1420 */ 1421 1422 /* 1423 ZEXTERN z_off_t ZEXPORT gzoffset OF((gzFile file)); 1424 1425 Returns the current offset in the file being read or written. This offset 1426 includes the count of bytes that precede the gzip stream, for example when 1427 appending or when using gzdopen() for reading. When reading, the offset 1428 does not include as yet unused buffered input. This information can be used 1429 for a progress indicator. On error, gzoffset() returns -1. 1430 */ 1431 1432 ZEXTERN int ZEXPORT gzeof OF((gzFile file)); 1433 /* 1434 Returns true (1) if the end-of-file indicator has been set while reading, 1435 false (0) otherwise. Note that the end-of-file indicator is set only if the 1436 read tried to go past the end of the input, but came up short. Therefore, 1437 just like feof(), gzeof() may return false even if there is no more data to 1438 read, in the event that the last read request was for the exact number of 1439 bytes remaining in the input file. This will happen if the input file size 1440 is an exact multiple of the buffer size. 1441 1442 If gzeof() returns true, then the read functions will return no more data, 1443 unless the end-of-file indicator is reset by gzclearerr() and the input file 1444 has grown since the previous end of file was detected. 1445 */ 1446 1447 ZEXTERN int ZEXPORT gzdirect OF((gzFile file)); 1448 /* 1449 Returns true (1) if file is being copied directly while reading, or false 1450 (0) if file is a gzip stream being decompressed. This state can change from 1451 false to true while reading the input file if the end of a gzip stream is 1452 reached, but is followed by data that is not another gzip stream. 1453 1454 If the input file is empty, gzdirect() will return true, since the input 1455 does not contain a gzip stream. 1456 1457 If gzdirect() is used immediately after gzopen() or gzdopen() it will 1458 cause buffers to be allocated to allow reading the file to determine if it 1459 is a gzip file. Therefore if gzbuffer() is used, it should be called before 1460 gzdirect(). 1461 */ 1462 1463 ZEXTERN int ZEXPORT gzclose OF((gzFile file)); 1464 /* 1465 Flushes all pending output if necessary, closes the compressed file and 1466 deallocates the (de)compression state. Note that once file is closed, you 1467 cannot call gzerror with file, since its structures have been deallocated. 1468 gzclose must not be called more than once on the same file, just as free 1469 must not be called more than once on the same allocation. 1470 1471 gzclose will return Z_STREAM_ERROR if file is not valid, Z_ERRNO on a 1472 file operation error, or Z_OK on success. 1473 */ 1474 1475 ZEXTERN int ZEXPORT gzclose_r OF((gzFile file)); 1476 ZEXTERN int ZEXPORT gzclose_w OF((gzFile file)); 1477 /* 1478 Same as gzclose(), but gzclose_r() is only for use when reading, and 1479 gzclose_w() is only for use when writing or appending. The advantage to 1480 using these instead of gzclose() is that they avoid linking in zlib 1481 compression or decompression code that is not used when only reading or only 1482 writing respectively. If gzclose() is used, then both compression and 1483 decompression code will be included the application when linking to a static 1484 zlib library. 1485 */ 1486 1487 ZEXTERN const char * ZEXPORT gzerror OF((gzFile file, int *errnum)); 1488 /* 1489 Returns the error message for the last error which occurred on the given 1490 compressed file. errnum is set to zlib error number. If an error occurred 1491 in the file system and not in the compression library, errnum is set to 1492 Z_ERRNO and the application may consult errno to get the exact error code. 1493 1494 The application must not modify the returned string. Future calls to 1495 this function may invalidate the previously returned string. If file is 1496 closed, then the string previously returned by gzerror will no longer be 1497 available. 1498 1499 gzerror() should be used to distinguish errors from end-of-file for those 1500 functions above that do not distinguish those cases in their return values. 1501 */ 1502 1503 ZEXTERN void ZEXPORT gzclearerr OF((gzFile file)); 1504 /* 1505 Clears the error and end-of-file flags for file. This is analogous to the 1506 clearerr() function in stdio. This is useful for continuing to read a gzip 1507 file that is being written concurrently. 1508 */ 1509 1510 1511 /* checksum functions */ 1512 1513 /* 1514 These functions are not related to compression but are exported 1515 anyway because they might be useful in applications using the compression 1516 library. 1517 */ 1518 1519 ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len)); 1520 /* 1521 Update a running Adler-32 checksum with the bytes buf[0..len-1] and 1522 return the updated checksum. If buf is Z_NULL, this function returns the 1523 required initial value for the checksum. 1524 1525 An Adler-32 checksum is almost as reliable as a CRC32 but can be computed 1526 much faster. 1527 1528 Usage example: 1529 1530 uLong adler = adler32(0L, Z_NULL, 0); 1531 1532 while (read_buffer(buffer, length) != EOF) { 1533 adler = adler32(adler, buffer, length); 1534 } 1535 if (adler != original_adler) error(); 1536 */ 1537 1538 /* 1539 ZEXTERN uLong ZEXPORT adler32_combine OF((uLong adler1, uLong adler2, 1540 z_off_t len2)); 1541 1542 Combine two Adler-32 checksums into one. For two sequences of bytes, seq1 1543 and seq2 with lengths len1 and len2, Adler-32 checksums were calculated for 1544 each, adler1 and adler2. adler32_combine() returns the Adler-32 checksum of 1545 seq1 and seq2 concatenated, requiring only adler1, adler2, and len2. 1546 */ 1547 1548 ZEXTERN uLong ZEXPORT crc32 OF((uLong crc, const Bytef *buf, uInt len)); 1549 /* 1550 Update a running CRC-32 with the bytes buf[0..len-1] and return the 1551 updated CRC-32. If buf is Z_NULL, this function returns the required 1552 initial value for the for the crc. Pre- and post-conditioning (one's 1553 complement) is performed within this function so it shouldn't be done by the 1554 application. 1555 1556 Usage example: 1557 1558 uLong crc = crc32(0L, Z_NULL, 0); 1559 1560 while (read_buffer(buffer, length) != EOF) { 1561 crc = crc32(crc, buffer, length); 1562 } 1563 if (crc != original_crc) error(); 1564 */ 1565 1566 /* 1567 ZEXTERN uLong ZEXPORT crc32_combine OF((uLong crc1, uLong crc2, z_off_t len2)); 1568 1569 Combine two CRC-32 check values into one. For two sequences of bytes, 1570 seq1 and seq2 with lengths len1 and len2, CRC-32 check values were 1571 calculated for each, crc1 and crc2. crc32_combine() returns the CRC-32 1572 check value of seq1 and seq2 concatenated, requiring only crc1, crc2, and 1573 len2. 1574 */ 1575 1576 1577 /* various hacks, don't look :) */ 1578 1579 /* deflateInit and inflateInit are macros to allow checking the zlib version 1580 * and the compiler's view of z_stream: 1581 */ 1582 ZEXTERN int ZEXPORT deflateInit_ OF((z_streamp strm, int level, 1583 const char *version, int stream_size)); 1584 ZEXTERN int ZEXPORT inflateInit_ OF((z_streamp strm, 1585 const char *version, int stream_size)); 1586 ZEXTERN int ZEXPORT deflateInit2_ OF((z_streamp strm, int level, int method, 1587 int windowBits, int memLevel, 1588 int strategy, const char *version, 1589 int stream_size)); 1590 ZEXTERN int ZEXPORT inflateInit2_ OF((z_streamp strm, int windowBits, 1591 const char *version, int stream_size)); 1592 ZEXTERN int ZEXPORT inflateBackInit_ OF((z_streamp strm, int windowBits, 1593 unsigned char FAR *window, 1594 const char *version, 1595 int stream_size)); 1596 #define deflateInit(strm, level) \ 1597 deflateInit_((strm), (level), ZLIB_VERSION, sizeof(z_stream)) 1598 #define inflateInit(strm) \ 1599 inflateInit_((strm), ZLIB_VERSION, sizeof(z_stream)) 1600 #define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \ 1601 deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\ 1602 (strategy), ZLIB_VERSION, sizeof(z_stream)) 1603 #define inflateInit2(strm, windowBits) \ 1604 inflateInit2_((strm), (windowBits), ZLIB_VERSION, sizeof(z_stream)) 1605 #define inflateBackInit(strm, windowBits, window) \ 1606 inflateBackInit_((strm), (windowBits), (window), \ 1607 ZLIB_VERSION, sizeof(z_stream)) 1608 1609 #ifdef _LARGEFILE64_SOURCE 1610 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *)); 1611 ZEXTERN off64_t ZEXPORT gzseek64 OF((gzFile, off64_t, int)); 1612 ZEXTERN off64_t ZEXPORT gztell64 OF((gzFile)); 1613 ZEXTERN off64_t ZEXPORT gzoffset64 OF((gzFile)); 1614 ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, off64_t)); 1615 ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, off64_t)); 1616 #endif 1617 1618 #if !defined(ZLIB_INTERNAL) && defined( _FILE_OFFSET_BITS ) && \ 1619 _FILE_OFFSET_BITS == 64 /* pcg */ 1620 # define gzopen gzopen64 1621 # define gzseek gzseek64 1622 # define gztell gztell64 1623 # define gzoffset gzoffset64 1624 # define adler32_combine adler32_combine64 1625 # define crc32_combine crc32_combine64 1626 # ifndef _LARGEFILE64_SOURCE 1627 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *)); 1628 ZEXTERN off_t ZEXPORT gzseek64 OF((gzFile, off_t, int)); 1629 ZEXTERN off_t ZEXPORT gztell64 OF((gzFile)); 1630 ZEXTERN off_t ZEXPORT gzoffset64 OF((gzFile)); 1631 ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, off_t)); 1632 ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, off_t)); 1633 # endif 1634 #else 1635 ZEXTERN gzFile ZEXPORT gzopen OF((const char *, const char *)); 1636 ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile, z_off_t, int)); 1637 ZEXTERN z_off_t ZEXPORT gztell OF((gzFile)); 1638 ZEXTERN z_off_t ZEXPORT gzoffset OF((gzFile)); 1639 ZEXTERN uLong ZEXPORT adler32_combine OF((uLong, uLong, z_off_t)); 1640 ZEXTERN uLong ZEXPORT crc32_combine OF((uLong, uLong, z_off_t)); 1641 #endif 1642 1643 #if !defined(ZUTIL_H) && !defined(NO_DUMMY_DECL) 1644 struct internal_state {int dummy;}; /* hack for buggy compilers */ 1645 #endif 1646 1647 ZEXTERN const char * ZEXPORT zError OF((int)); 1648 ZEXTERN int ZEXPORT inflateSyncPoint OF((z_streamp)); 1649 ZEXTERN const uLongf * ZEXPORT get_crc_table OF((void)); 1650 ZEXTERN int ZEXPORT inflateUndermine OF((z_streamp, int)); 1651 1652 #ifdef __cplusplus 1653 } 1654 #endif 1655 1656 #endif /* ZLIB_H */ 1657