1 /* $NetBSD: zlib.h,v 1.2 2020/05/04 00:18:34 agc Exp $ */ 2 3 /* zlib.h -- interface of the 'zlib' general purpose compression library 4 version 1.2.3, July 18th, 2005 5 6 Copyright (C) 1995-2005 Jean-loup Gailly and Mark Adler 7 8 This software is provided 'as-is', without any express or implied 9 warranty. In no event will the authors be held liable for any damages 10 arising from the use of this software. 11 12 Permission is granted to anyone to use this software for any purpose, 13 including commercial applications, and to alter it and redistribute it 14 freely, subject to the following restrictions: 15 16 1. The origin of this software must not be misrepresented; you must not 17 claim that you wrote the original software. If you use this software 18 in a product, an acknowledgment in the product documentation would be 19 appreciated but is not required. 20 2. Altered source versions must be plainly marked as such, and must not be 21 misrepresented as being the original software. 22 3. This notice may not be removed or altered from any source distribution. 23 24 Jean-loup Gailly Mark Adler 25 jloup@gzip.org madler@alumni.caltech.edu 26 27 28 The data format used by the zlib library is described by RFCs (Request for 29 Comments) 1950 to 1952 in the files http://www.ietf.org/rfc/rfc1950.txt 30 (zlib format), rfc1951.txt (deflate format) and rfc1952.txt (gzip format). 31 */ 32 33 #ifndef ZLIB_H 34 #define ZLIB_H 35 36 #include "config.h" 37 38 /* $NetBSD: zlib.h,v 1.2 2020/05/04 00:18:34 agc Exp $ */ 39 40 /* zconf.h -- configuration of the zlib compression library 41 * Copyright (C) 1995-2005 Jean-loup Gailly. 42 * For conditions of distribution and use, see copyright notice in zlib.h 43 */ 44 45 /* @(#) Id */ 46 47 #ifndef ZCONF_H 48 #define ZCONF_H 49 50 #include <sys/types.h> 51 52 /* we don't want these colliding with anything else out there */ 53 #define Z_PREFIX 1 54 55 /* 56 * If you *really* need a unique prefix for all types and library functions, 57 * compile with -DZ_PREFIX. The "standard" zlib should be compiled without it. 58 */ 59 #ifdef Z_PREFIX 60 # define deflateInit_ netpgpv_z_deflateInit_ 61 # define deflate netpgpv_z_deflate 62 # define deflateEnd netpgpv_z_deflateEnd 63 # define inflateInit_ netpgpv_z_inflateInit_ 64 # define inflate netpgpv_z_inflate 65 # define inflateEnd netpgpv_z_inflateEnd 66 # define deflateInit2_ netpgpv_z_deflateInit2_ 67 # define deflateSetDictionary netpgpv_z_deflateSetDictionary 68 # define deflateCopy netpgpv_z_deflateCopy 69 # define deflateReset netpgpv_z_deflateReset 70 # define deflateParams netpgpv_z_deflateParams 71 # define deflateBound netpgpv_z_deflateBound 72 # define deflatePrime netpgpv_z_deflatePrime 73 # define inflateInit2_ netpgpv_z_inflateInit2_ 74 # define inflateSetDictionary netpgpv_z_inflateSetDictionary 75 # define inflateSync netpgpv_z_inflateSync 76 # define inflateSyncPoint netpgpv_z_inflateSyncPoint 77 # define inflateCopy netpgpv_z_inflateCopy 78 # define inflateReset netpgpv_z_inflateReset 79 # define inflateBack netpgpv_z_inflateBack 80 # define inflateBackEnd netpgpv_z_inflateBackEnd 81 # define compress netpgpv_z_compress 82 # define compress2 netpgpv_z_compress2 83 # define compressBound netpgpv_z_compressBound 84 # define uncompress netpgpv_z_uncompress 85 # define adler32 netpgpv_z_adler32 86 # define crc32 netpgpv_z_crc32 87 # define get_crc_table netpgpv_z_get_crc_table 88 # define zError netpgpv_z_zError 89 90 # define alloc_func netpgpv_z_alloc_func 91 # define free_func netpgpv_z_free_func 92 # define in_func netpgpv_z_in_func 93 # define out_func netpgpv_z_out_func 94 # define Byte netpgpv_z_Byte 95 # define uInt netpgpv_z_uInt 96 # define uLong netpgpv_z_uLong 97 # define Bytef netpgpv_z_Bytef 98 # define charf netpgpv_z_charf 99 # define intf netpgpv_z_intf 100 # define uIntf netpgpv_z_uIntf 101 # define uLongf netpgpv_z_uLongf 102 # define voidpf netpgpv_z_voidpf 103 # define voidp netpgpv_z_voidp 104 #endif 105 106 #if defined(__MSDOS__) && !defined(MSDOS) 107 # define MSDOS 108 #endif 109 #if (defined(OS_2) || defined(__OS2__)) && !defined(OS2) 110 # define OS2 111 #endif 112 #if defined(_WINDOWS) && !defined(WINDOWS) 113 # define WINDOWS 114 #endif 115 #if defined(_WIN32) || defined(_WIN32_WCE) || defined(__WIN32__) 116 # ifndef WIN32 117 # define WIN32 118 # endif 119 #endif 120 #if (defined(MSDOS) || defined(OS2) || defined(WINDOWS)) && !defined(WIN32) 121 # if !defined(__GNUC__) && !defined(__FLAT__) && !defined(__386__) 122 # ifndef SYS16BIT 123 # define SYS16BIT 124 # endif 125 # endif 126 #endif 127 128 /* 129 * Compile with -DMAXSEG_64K if the alloc function cannot allocate more 130 * than 64k bytes at a time (needed on systems with 16-bit int). 131 */ 132 #ifdef SYS16BIT 133 # define MAXSEG_64K 134 #endif 135 #ifdef MSDOS 136 # define UNALIGNED_OK 137 #endif 138 139 #ifdef __STDC_VERSION__ 140 # ifndef STDC 141 # define STDC 142 # endif 143 # if __STDC_VERSION__ >= 199901L 144 # ifndef STDC99 145 # define STDC99 146 # endif 147 # endif 148 #endif 149 #if !defined(STDC) && (defined(__STDC__) || defined(__cplusplus)) 150 # define STDC 151 #endif 152 #if !defined(STDC) && (defined(__GNUC__) || defined(__BORLANDC__)) 153 # define STDC 154 #endif 155 #if !defined(STDC) && (defined(MSDOS) || defined(WINDOWS) || defined(WIN32)) 156 # define STDC 157 #endif 158 #if !defined(STDC) && (defined(OS2) || defined(__HOS_AIX__)) 159 # define STDC 160 #endif 161 162 #if defined(__OS400__) && !defined(STDC) /* iSeries (formerly AS/400). */ 163 # define STDC 164 #endif 165 166 #ifndef STDC 167 # ifndef const /* cannot use !defined(STDC) && !defined(const) on Mac */ 168 # define const /* note: need a more gentle solution here */ 169 # endif 170 #endif 171 172 /* Some Mac compilers merge all .h files incorrectly: */ 173 #if defined(__MWERKS__)||defined(applec)||defined(THINK_C)||defined(__SC__) 174 # define NO_DUMMY_DECL 175 #endif 176 177 /* Maximum value for memLevel in deflateInit2 */ 178 #ifndef MAX_MEM_LEVEL 179 # ifdef MAXSEG_64K 180 # define MAX_MEM_LEVEL 8 181 # else 182 # define MAX_MEM_LEVEL 9 183 # endif 184 #endif 185 186 /* Maximum value for windowBits in deflateInit2 and inflateInit2. 187 * WARNING: reducing MAX_WBITS makes minigzip unable to extract .gz files 188 * created by gzip. (Files created by minigzip can still be extracted by 189 * gzip.) 190 */ 191 #ifndef MAX_WBITS 192 # define MAX_WBITS 15 /* 32K LZ77 window */ 193 #endif 194 195 /* The memory requirements for deflate are (in bytes): 196 (1 << (windowBits+2)) + (1 << (memLevel+9)) 197 that is: 128K for windowBits=15 + 128K for memLevel = 8 (default values) 198 plus a few kilobytes for small objects. For example, if you want to reduce 199 the default memory requirements from 256K to 128K, compile with 200 make CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7" 201 Of course this will generally degrade compression (there's no free lunch). 202 203 The memory requirements for inflate are (in bytes) 1 << windowBits 204 that is, 32K for windowBits=15 (default value) plus a few kilobytes 205 for small objects. 206 */ 207 208 /* Type declarations */ 209 210 #ifndef OF /* function prototypes */ 211 # ifdef STDC 212 # define OF(args) args 213 # else 214 # define OF(args) () 215 # endif 216 #endif 217 218 /* The following definitions for FAR are needed only for MSDOS mixed 219 * model programming (small or medium model with some far allocations). 220 * This was tested only with MSC; for other MSDOS compilers you may have 221 * to define NO_MEMCPY in zutil.h. If you don't need the mixed model, 222 * just define FAR to be empty. 223 */ 224 #ifdef SYS16BIT 225 # if defined(M_I86SM) || defined(M_I86MM) 226 /* MSC small or medium model */ 227 # define SMALL_MEDIUM 228 # ifdef _MSC_VER 229 # define FAR _far 230 # else 231 # define FAR far 232 # endif 233 # endif 234 # if (defined(__SMALL__) || defined(__MEDIUM__)) 235 /* Turbo C small or medium model */ 236 # define SMALL_MEDIUM 237 # ifdef __BORLANDC__ 238 # define FAR _far 239 # else 240 # define FAR far 241 # endif 242 # endif 243 #endif 244 245 #if defined(WINDOWS) || defined(WIN32) 246 /* If building or using zlib as a DLL, define ZLIB_DLL. 247 * This is not mandatory, but it offers a little performance increase. 248 */ 249 # ifdef ZLIB_DLL 250 # if defined(WIN32) && (!defined(__BORLANDC__) || (__BORLANDC__ >= 0x500)) 251 # ifdef ZLIB_INTERNAL 252 # define ZEXTERN extern __declspec(dllexport) 253 # else 254 # define ZEXTERN extern __declspec(dllimport) 255 # endif 256 # endif 257 # endif /* ZLIB_DLL */ 258 /* If building or using zlib with the WINAPI/WINAPIV calling convention, 259 * define ZLIB_WINAPI. 260 * Caution: the standard ZLIB1.DLL is NOT compiled using ZLIB_WINAPI. 261 */ 262 # ifdef ZLIB_WINAPI 263 # ifdef FAR 264 # undef FAR 265 # endif 266 # include <windows.h> 267 /* No need for _export, use ZLIB.DEF instead. */ 268 /* For complete Windows compatibility, use WINAPI, not __stdcall. */ 269 # define ZEXPORT WINAPI 270 # ifdef WIN32 271 # define ZEXPORTVA WINAPIV 272 # else 273 # define ZEXPORTVA FAR CDECL 274 # endif 275 # endif 276 #endif 277 278 #if defined (__BEOS__) 279 # ifdef ZLIB_DLL 280 # ifdef ZLIB_INTERNAL 281 # define ZEXPORT __declspec(dllexport) 282 # define ZEXPORTVA __declspec(dllexport) 283 # else 284 # define ZEXPORT __declspec(dllimport) 285 # define ZEXPORTVA __declspec(dllimport) 286 # endif 287 # endif 288 #endif 289 290 #ifndef ZEXTERN 291 # define ZEXTERN extern 292 #endif 293 #ifndef ZEXPORT 294 # define ZEXPORT 295 #endif 296 #ifndef ZEXPORTVA 297 # define ZEXPORTVA 298 #endif 299 300 #ifndef FAR 301 # define FAR 302 #endif 303 304 #if !defined(__MACTYPES__) 305 typedef unsigned char Byte; /* 8 bits */ 306 #endif 307 typedef unsigned int uInt; /* 16 bits or more */ 308 typedef unsigned long uLong; /* 32 bits or more */ 309 310 #ifdef SMALL_MEDIUM 311 /* Borland C/C++ and some old MSC versions ignore FAR inside typedef */ 312 # define Bytef Byte FAR 313 #else 314 typedef Byte FAR Bytef; 315 #endif 316 typedef char FAR charf; 317 typedef int FAR intf; 318 typedef uInt FAR uIntf; 319 typedef uLong FAR uLongf; 320 321 #ifdef STDC 322 typedef void const *voidpc; 323 typedef void FAR *voidpf; 324 typedef void *voidp; 325 #else 326 typedef Byte const *voidpc; 327 typedef Byte FAR *voidpf; 328 typedef Byte *voidp; 329 #endif 330 331 #if defined(HAVE_UNISTD_H) || (defined(__NetBSD__) && (!defined(_KERNEL) && !defined(_STANDALONE))) 332 # include <sys/types.h> /* for off_t */ 333 # include <unistd.h> /* for SEEK_* and off_t */ 334 # ifdef VMS 335 # include <unixio.h> /* for off_t */ 336 # endif 337 # define z_off_t off_t 338 # define z_ptrdiff_t ptrdiff_t 339 #endif 340 #ifndef SEEK_SET 341 # define SEEK_SET 0 /* Seek from beginning of file. */ 342 # define SEEK_CUR 1 /* Seek from current position. */ 343 # define SEEK_END 2 /* Set file pointer to EOF plus "offset" */ 344 #endif 345 #ifndef z_off_t 346 # define z_off_t long 347 #endif 348 #ifndef z_ptrdiff_t 349 # define z_ptrdiff_t long 350 #endif 351 352 #if defined(__OS400__) 353 # define NO_vsnprintf 354 #endif 355 356 #if defined(__MVS__) 357 # define NO_vsnprintf 358 # ifdef FAR 359 # undef FAR 360 # endif 361 #endif 362 363 /* MVS linker does not support external names larger than 8 bytes */ 364 #if defined(__MVS__) 365 # pragma map(deflateInit_,"DEIN") 366 # pragma map(deflateInit2_,"DEIN2") 367 # pragma map(deflateEnd,"DEEND") 368 # pragma map(deflateBound,"DEBND") 369 # pragma map(inflateInit_,"ININ") 370 # pragma map(inflateInit2_,"ININ2") 371 # pragma map(inflateEnd,"INEND") 372 # pragma map(inflateSync,"INSY") 373 # pragma map(inflateSetDictionary,"INSEDI") 374 # pragma map(compressBound,"CMBND") 375 # pragma map(inflate_table,"INTABL") 376 # pragma map(inflate_fast,"INFA") 377 # pragma map(inflate_copyright,"INCOPY") 378 #endif 379 380 #endif /* ZCONF_H */ 381 #ifdef __cplusplus 382 extern "C" { 383 #endif 384 385 #define ZLIB_VERSION "1.2.3" 386 #define ZLIB_VERNUM 0x1230 387 388 /* 389 The 'zlib' compression library provides in-memory compression and 390 decompression functions, including integrity checks of the uncompressed 391 data. This version of the library supports only one compression method 392 (deflation) but other algorithms will be added later and will have the same 393 stream interface. 394 395 Compression can be done in a single step if the buffers are large 396 enough (for example if an input file is mmap'ed), or can be done by 397 repeated calls of the compression function. In the latter case, the 398 application must provide more input and/or consume the output 399 (providing more output space) before each call. 400 401 The compressed data format used by default by the in-memory functions is 402 the zlib format, which is a zlib wrapper documented in RFC 1950, wrapped 403 around a deflate stream, which is itself documented in RFC 1951. 404 405 The library also supports reading and writing files in gzip (.gz) format 406 with an interface similar to that of stdio using the functions that start 407 with "gz". The gzip format is different from the zlib format. gzip is a 408 gzip wrapper, documented in RFC 1952, wrapped around a deflate stream. 409 410 This library can optionally read and write gzip streams in memory as well. 411 412 The zlib format was designed to be compact and fast for use in memory 413 and on communications channels. The gzip format was designed for single- 414 file compression on file systems, has a larger header than zlib to maintain 415 directory information, and uses a different, slower check method than zlib. 416 417 The library does not install any signal handler. The decoder checks 418 the consistency of the compressed data, so the library should never 419 crash even in case of corrupted input. 420 */ 421 422 typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size)); 423 typedef void (*free_func) OF((voidpf opaque, voidpf address)); 424 425 struct internal_state; 426 427 typedef struct z_stream_s { 428 Bytef *next_in; /* next input byte */ 429 uInt avail_in; /* number of bytes available at next_in */ 430 uLong total_in; /* total nb of input bytes read so far */ 431 432 Bytef *next_out; /* next output byte should be put there */ 433 uInt avail_out; /* remaining free space at next_out */ 434 uLong total_out; /* total nb of bytes output so far */ 435 436 char *msg; /* last error message, NULL if no error */ 437 struct internal_state FAR *state; /* not visible by applications */ 438 439 alloc_func zalloc; /* used to allocate the internal state */ 440 free_func zfree; /* used to free the internal state */ 441 voidpf opaque; /* private data object passed to zalloc and zfree */ 442 443 int data_type; /* best guess about the data type: binary or text */ 444 uLong adler; /* adler32 value of the uncompressed data */ 445 uLong reserved; /* reserved for future use */ 446 } z_stream; 447 448 typedef z_stream FAR *z_streamp; 449 450 /* 451 gzip header information passed to and from zlib routines. See RFC 1952 452 for more details on the meanings of these fields. 453 */ 454 typedef struct gz_header_s { 455 int text; /* true if compressed data believed to be text */ 456 uLong time; /* modification time */ 457 int xflags; /* extra flags (not used when writing a gzip file) */ 458 int os; /* operating system */ 459 Bytef *extra; /* pointer to extra field or Z_NULL if none */ 460 uInt extra_len; /* extra field length (valid if extra != Z_NULL) */ 461 uInt extra_max; /* space at extra (only when reading header) */ 462 Bytef *name; /* pointer to zero-terminated file name or Z_NULL */ 463 uInt name_max; /* space at name (only when reading header) */ 464 Bytef *comment; /* pointer to zero-terminated comment or Z_NULL */ 465 uInt comm_max; /* space at comment (only when reading header) */ 466 int hcrc; /* true if there was or will be a header crc */ 467 int done; /* true when done reading gzip header (not used 468 when writing a gzip file) */ 469 } gz_header; 470 471 typedef gz_header FAR *gz_headerp; 472 473 /* 474 The application must update next_in and avail_in when avail_in has 475 dropped to zero. It must update next_out and avail_out when avail_out 476 has dropped to zero. The application must initialize zalloc, zfree and 477 opaque before calling the init function. All other fields are set by the 478 compression library and must not be updated by the application. 479 480 The opaque value provided by the application will be passed as the first 481 parameter for calls of zalloc and zfree. This can be useful for custom 482 memory management. The compression library attaches no meaning to the 483 opaque value. 484 485 zalloc must return Z_NULL if there is not enough memory for the object. 486 If zlib is used in a multi-threaded application, zalloc and zfree must be 487 thread safe. 488 489 On 16-bit systems, the functions zalloc and zfree must be able to allocate 490 exactly 65536 bytes, but will not be required to allocate more than this 491 if the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS, 492 pointers returned by zalloc for objects of exactly 65536 bytes *must* 493 have their offset normalized to zero. The default allocation function 494 provided by this library ensures this (see zutil.c). To reduce memory 495 requirements and avoid any allocation of 64K objects, at the expense of 496 compression ratio, compile the library with -DMAX_WBITS=14 (see zconf.h). 497 498 The fields total_in and total_out can be used for statistics or 499 progress reports. After compression, total_in holds the total size of 500 the uncompressed data and may be saved for use in the decompressor 501 (particularly if the decompressor wants to decompress everything in 502 a single step). 503 */ 504 505 /* constants */ 506 507 #define Z_NO_FLUSH 0 508 #define Z_PARTIAL_FLUSH 1 /* will be removed, use Z_SYNC_FLUSH instead */ 509 #define Z_SYNC_FLUSH 2 510 #define Z_FULL_FLUSH 3 511 #define Z_FINISH 4 512 #define Z_BLOCK 5 513 /* Allowed flush values; see deflate() and inflate() below for details */ 514 515 #define Z_OK 0 516 #define Z_STREAM_END 1 517 #define Z_NEED_DICT 2 518 #define Z_ERRNO (-1) 519 #define Z_STREAM_ERROR (-2) 520 #define Z_DATA_ERROR (-3) 521 #define Z_MEM_ERROR (-4) 522 #define Z_BUF_ERROR (-5) 523 #define Z_VERSION_ERROR (-6) 524 /* Return codes for the compression/decompression functions. Negative 525 * values are errors, positive values are used for special but normal events. 526 */ 527 528 #define Z_NO_COMPRESSION 0 529 #define Z_BEST_SPEED 1 530 #define Z_BEST_COMPRESSION 9 531 #define Z_DEFAULT_COMPRESSION (-1) 532 /* compression levels */ 533 534 #define Z_FILTERED 1 535 #define Z_HUFFMAN_ONLY 2 536 #define Z_RLE 3 537 #define Z_FIXED 4 538 #define Z_DEFAULT_STRATEGY 0 539 /* compression strategy; see deflateInit2() below for details */ 540 541 #define Z_BINARY 0 542 #define Z_TEXT 1 543 #define Z_ASCII Z_TEXT /* for compatibility with 1.2.2 and earlier */ 544 #define Z_UNKNOWN 2 545 /* Possible values of the data_type field (though see inflate()) */ 546 547 #define Z_DEFLATED 8 548 /* The deflate compression method (the only one supported in this version) */ 549 550 #define Z_NULL 0 /* for initializing zalloc, zfree, opaque */ 551 552 #define zlib_version zlibVersion() 553 /* for compatibility with versions < 1.0.2 */ 554 555 /* basic functions */ 556 557 ZEXTERN const char * ZEXPORT zlibVersion OF((void)); 558 /* The application can compare zlibVersion and ZLIB_VERSION for consistency. 559 If the first character differs, the library code actually used is 560 not compatible with the zlib.h header file used by the application. 561 This check is automatically made by deflateInit and inflateInit. 562 */ 563 564 /* 565 ZEXTERN int ZEXPORT deflateInit OF((z_streamp strm, int level)); 566 567 Initializes the internal stream state for compression. The fields 568 zalloc, zfree and opaque must be initialized before by the caller. 569 If zalloc and zfree are set to Z_NULL, deflateInit updates them to 570 use default allocation functions. 571 572 The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9: 573 1 gives best speed, 9 gives best compression, 0 gives no compression at 574 all (the input data is simply copied a block at a time). 575 Z_DEFAULT_COMPRESSION requests a default compromise between speed and 576 compression (currently equivalent to level 6). 577 578 deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not 579 enough memory, Z_STREAM_ERROR if level is not a valid compression level, 580 Z_VERSION_ERROR if the zlib library version (zlib_version) is incompatible 581 with the version assumed by the caller (ZLIB_VERSION). 582 msg is set to null if there is no error message. deflateInit does not 583 perform any compression: this will be done by deflate(). 584 */ 585 586 587 ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush)); 588 /* 589 deflate compresses as much data as possible, and stops when the input 590 buffer becomes empty or the output buffer becomes full. It may introduce some 591 output latency (reading input without producing any output) except when 592 forced to flush. 593 594 The detailed semantics are as follows. deflate performs one or both of the 595 following actions: 596 597 - Compress more input starting at next_in and update next_in and avail_in 598 accordingly. If not all input can be processed (because there is not 599 enough room in the output buffer), next_in and avail_in are updated and 600 processing will resume at this point for the next call of deflate(). 601 602 - Provide more output starting at next_out and update next_out and avail_out 603 accordingly. This action is forced if the parameter flush is non zero. 604 Forcing flush frequently degrades the compression ratio, so this parameter 605 should be set only when necessary (in interactive applications). 606 Some output may be provided even if flush is not set. 607 608 Before the call of deflate(), the application should ensure that at least 609 one of the actions is possible, by providing more input and/or consuming 610 more output, and updating avail_in or avail_out accordingly; avail_out 611 should never be zero before the call. The application can consume the 612 compressed output when it wants, for example when the output buffer is full 613 (avail_out == 0), or after each call of deflate(). If deflate returns Z_OK 614 and with zero avail_out, it must be called again after making room in the 615 output buffer because there might be more output pending. 616 617 Normally the parameter flush is set to Z_NO_FLUSH, which allows deflate to 618 decide how much data to accumualte before producing output, in order to 619 maximize compression. 620 621 If the parameter flush is set to Z_SYNC_FLUSH, all pending output is 622 flushed to the output buffer and the output is aligned on a byte boundary, so 623 that the decompressor can get all input data available so far. (In particular 624 avail_in is zero after the call if enough output space has been provided 625 before the call.) Flushing may degrade compression for some compression 626 algorithms and so it should be used only when necessary. 627 628 If flush is set to Z_FULL_FLUSH, all output is flushed as with 629 Z_SYNC_FLUSH, and the compression state is reset so that decompression can 630 restart from this point if previous compressed data has been damaged or if 631 random access is desired. Using Z_FULL_FLUSH too often can seriously degrade 632 compression. 633 634 If deflate returns with avail_out == 0, this function must be called again 635 with the same value of the flush parameter and more output space (updated 636 avail_out), until the flush is complete (deflate returns with non-zero 637 avail_out). In the case of a Z_FULL_FLUSH or Z_SYNC_FLUSH, make sure that 638 avail_out is greater than six to avoid repeated flush markers due to 639 avail_out == 0 on return. 640 641 If the parameter flush is set to Z_FINISH, pending input is processed, 642 pending output is flushed and deflate returns with Z_STREAM_END if there 643 was enough output space; if deflate returns with Z_OK, this function must be 644 called again with Z_FINISH and more output space (updated avail_out) but no 645 more input data, until it returns with Z_STREAM_END or an error. After 646 deflate has returned Z_STREAM_END, the only possible operations on the 647 stream are deflateReset or deflateEnd. 648 649 Z_FINISH can be used immediately after deflateInit if all the compression 650 is to be done in a single step. In this case, avail_out must be at least 651 the value returned by deflateBound (see below). If deflate does not return 652 Z_STREAM_END, then it must be called again as described above. 653 654 deflate() sets strm->adler to the adler32 checksum of all input read 655 so far (that is, total_in bytes). 656 657 deflate() may update strm->data_type if it can make a good guess about 658 the input data type (Z_BINARY or Z_TEXT). In doubt, the data is considered 659 binary. This field is only for information purposes and does not affect 660 the compression algorithm in any manner. 661 662 deflate() returns Z_OK if some progress has been made (more input 663 processed or more output produced), Z_STREAM_END if all input has been 664 consumed and all output has been produced (only when flush is set to 665 Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example 666 if next_in or next_out was NULL), Z_BUF_ERROR if no progress is possible 667 (for example avail_in or avail_out was zero). Note that Z_BUF_ERROR is not 668 fatal, and deflate() can be called again with more input and more output 669 space to continue compressing. 670 */ 671 672 673 ZEXTERN int ZEXPORT deflateEnd OF((z_streamp strm)); 674 /* 675 All dynamically allocated data structures for this stream are freed. 676 This function discards any unprocessed input and does not flush any 677 pending output. 678 679 deflateEnd returns Z_OK if success, Z_STREAM_ERROR if the 680 stream state was inconsistent, Z_DATA_ERROR if the stream was freed 681 prematurely (some input or output was discarded). In the error case, 682 msg may be set but then points to a static string (which must not be 683 deallocated). 684 */ 685 686 687 /* 688 ZEXTERN int ZEXPORT inflateInit OF((z_streamp strm)); 689 690 Initializes the internal stream state for decompression. The fields 691 next_in, avail_in, zalloc, zfree and opaque must be initialized before by 692 the caller. If next_in is not Z_NULL and avail_in is large enough (the exact 693 value depends on the compression method), inflateInit determines the 694 compression method from the zlib header and allocates all data structures 695 accordingly; otherwise the allocation will be deferred to the first call of 696 inflate. If zalloc and zfree are set to Z_NULL, inflateInit updates them to 697 use default allocation functions. 698 699 inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough 700 memory, Z_VERSION_ERROR if the zlib library version is incompatible with the 701 version assumed by the caller. msg is set to null if there is no error 702 message. inflateInit does not perform any decompression apart from reading 703 the zlib header if present: this will be done by inflate(). (So next_in and 704 avail_in may be modified, but next_out and avail_out are unchanged.) 705 */ 706 707 708 ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush)); 709 /* 710 inflate decompresses as much data as possible, and stops when the input 711 buffer becomes empty or the output buffer becomes full. It may introduce 712 some output latency (reading input without producing any output) except when 713 forced to flush. 714 715 The detailed semantics are as follows. inflate performs one or both of the 716 following actions: 717 718 - Decompress more input starting at next_in and update next_in and avail_in 719 accordingly. If not all input can be processed (because there is not 720 enough room in the output buffer), next_in is updated and processing 721 will resume at this point for the next call of inflate(). 722 723 - Provide more output starting at next_out and update next_out and avail_out 724 accordingly. inflate() provides as much output as possible, until there 725 is no more input data or no more space in the output buffer (see below 726 about the flush parameter). 727 728 Before the call of inflate(), the application should ensure that at least 729 one of the actions is possible, by providing more input and/or consuming 730 more output, and updating the next_* and avail_* values accordingly. 731 The application can consume the uncompressed output when it wants, for 732 example when the output buffer is full (avail_out == 0), or after each 733 call of inflate(). If inflate returns Z_OK and with zero avail_out, it 734 must be called again after making room in the output buffer because there 735 might be more output pending. 736 737 The flush parameter of inflate() can be Z_NO_FLUSH, Z_SYNC_FLUSH, 738 Z_FINISH, or Z_BLOCK. Z_SYNC_FLUSH requests that inflate() flush as much 739 output as possible to the output buffer. Z_BLOCK requests that inflate() stop 740 if and when it gets to the next deflate block boundary. When decoding the 741 zlib or gzip format, this will cause inflate() to return immediately after 742 the header and before the first block. When doing a raw inflate, inflate() 743 will go ahead and process the first block, and will return when it gets to 744 the end of that block, or when it runs out of data. 745 746 The Z_BLOCK option assists in appending to or combining deflate streams. 747 Also to assist in this, on return inflate() will set strm->data_type to the 748 number of unused bits in the last byte taken from strm->next_in, plus 64 749 if inflate() is currently decoding the last block in the deflate stream, 750 plus 128 if inflate() returned immediately after decoding an end-of-block 751 code or decoding the complete header up to just before the first byte of the 752 deflate stream. The end-of-block will not be indicated until all of the 753 uncompressed data from that block has been written to strm->next_out. The 754 number of unused bits may in general be greater than seven, except when 755 bit 7 of data_type is set, in which case the number of unused bits will be 756 less than eight. 757 758 inflate() should normally be called until it returns Z_STREAM_END or an 759 error. However if all decompression is to be performed in a single step 760 (a single call of inflate), the parameter flush should be set to 761 Z_FINISH. In this case all pending input is processed and all pending 762 output is flushed; avail_out must be large enough to hold all the 763 uncompressed data. (The size of the uncompressed data may have been saved 764 by the compressor for this purpose.) The next operation on this stream must 765 be inflateEnd to deallocate the decompression state. The use of Z_FINISH 766 is never required, but can be used to inform inflate that a faster approach 767 may be used for the single inflate() call. 768 769 In this implementation, inflate() always flushes as much output as 770 possible to the output buffer, and always uses the faster approach on the 771 first call. So the only effect of the flush parameter in this implementation 772 is on the return value of inflate(), as noted below, or when it returns early 773 because Z_BLOCK is used. 774 775 If a preset dictionary is needed after this call (see inflateSetDictionary 776 below), inflate sets strm->adler to the adler32 checksum of the dictionary 777 chosen by the compressor and returns Z_NEED_DICT; otherwise it sets 778 strm->adler to the adler32 checksum of all output produced so far (that is, 779 total_out bytes) and returns Z_OK, Z_STREAM_END or an error code as described 780 below. At the end of the stream, inflate() checks that its computed adler32 781 checksum is equal to that saved by the compressor and returns Z_STREAM_END 782 only if the checksum is correct. 783 784 inflate() will decompress and check either zlib-wrapped or gzip-wrapped 785 deflate data. The header type is detected automatically. Any information 786 contained in the gzip header is not retained, so applications that need that 787 information should instead use raw inflate, see inflateInit2() below, or 788 inflateBack() and perform their own processing of the gzip header and 789 trailer. 790 791 inflate() returns Z_OK if some progress has been made (more input processed 792 or more output produced), Z_STREAM_END if the end of the compressed data has 793 been reached and all uncompressed output has been produced, Z_NEED_DICT if a 794 preset dictionary is needed at this point, Z_DATA_ERROR if the input data was 795 corrupted (input stream not conforming to the zlib format or incorrect check 796 value), Z_STREAM_ERROR if the stream structure was inconsistent (for example 797 if next_in or next_out was NULL), Z_MEM_ERROR if there was not enough memory, 798 Z_BUF_ERROR if no progress is possible or if there was not enough room in the 799 output buffer when Z_FINISH is used. Note that Z_BUF_ERROR is not fatal, and 800 inflate() can be called again with more input and more output space to 801 continue decompressing. If Z_DATA_ERROR is returned, the application may then 802 call inflateSync() to look for a good compression block if a partial recovery 803 of the data is desired. 804 */ 805 806 807 ZEXTERN int ZEXPORT inflateEnd OF((z_streamp strm)); 808 /* 809 All dynamically allocated data structures for this stream are freed. 810 This function discards any unprocessed input and does not flush any 811 pending output. 812 813 inflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state 814 was inconsistent. In the error case, msg may be set but then points to a 815 static string (which must not be deallocated). 816 */ 817 818 /* Advanced functions */ 819 820 /* 821 The following functions are needed only in some special applications. 822 */ 823 824 /* 825 ZEXTERN int ZEXPORT deflateInit2 OF((z_streamp strm, 826 int level, 827 int method, 828 int windowBits, 829 int memLevel, 830 int strategy)); 831 832 This is another version of deflateInit with more compression options. The 833 fields next_in, zalloc, zfree and opaque must be initialized before by 834 the caller. 835 836 The method parameter is the compression method. It must be Z_DEFLATED in 837 this version of the library. 838 839 The windowBits parameter is the base two logarithm of the window size 840 (the size of the history buffer). It should be in the range 8..15 for this 841 version of the library. Larger values of this parameter result in better 842 compression at the expense of memory usage. The default value is 15 if 843 deflateInit is used instead. 844 845 windowBits can also be -8..-15 for raw deflate. In this case, -windowBits 846 determines the window size. deflate() will then generate raw deflate data 847 with no zlib header or trailer, and will not compute an adler32 check value. 848 849 windowBits can also be greater than 15 for optional gzip encoding. Add 850 16 to windowBits to write a simple gzip header and trailer around the 851 compressed data instead of a zlib wrapper. The gzip header will have no 852 file name, no extra data, no comment, no modification time (set to zero), 853 no header crc, and the operating system will be set to 255 (unknown). If a 854 gzip stream is being written, strm->adler is a crc32 instead of an adler32. 855 856 The memLevel parameter specifies how much memory should be allocated 857 for the internal compression state. memLevel=1 uses minimum memory but 858 is slow and reduces compression ratio; memLevel=9 uses maximum memory 859 for optimal speed. The default value is 8. See zconf.h for total memory 860 usage as a function of windowBits and memLevel. 861 862 The strategy parameter is used to tune the compression algorithm. Use the 863 value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data produced by a 864 filter (or predictor), Z_HUFFMAN_ONLY to force Huffman encoding only (no 865 string match), or Z_RLE to limit match distances to one (run-length 866 encoding). Filtered data consists mostly of small values with a somewhat 867 random distribution. In this case, the compression algorithm is tuned to 868 compress them better. The effect of Z_FILTERED is to force more Huffman 869 coding and less string matching; it is somewhat intermediate between 870 Z_DEFAULT and Z_HUFFMAN_ONLY. Z_RLE is designed to be almost as fast as 871 Z_HUFFMAN_ONLY, but give better compression for PNG image data. The strategy 872 parameter only affects the compression ratio but not the correctness of the 873 compressed output even if it is not set appropriately. Z_FIXED prevents the 874 use of dynamic Huffman codes, allowing for a simpler decoder for special 875 applications. 876 877 deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough 878 memory, Z_STREAM_ERROR if a parameter is invalid (such as an invalid 879 method). msg is set to null if there is no error message. deflateInit2 does 880 not perform any compression: this will be done by deflate(). 881 */ 882 883 ZEXTERN int ZEXPORT deflateSetDictionary OF((z_streamp strm, 884 const Bytef *dictionary, 885 uInt dictLength)); 886 /* 887 Initializes the compression dictionary from the given byte sequence 888 without producing any compressed output. This function must be called 889 immediately after deflateInit, deflateInit2 or deflateReset, before any 890 call of deflate. The compressor and decompressor must use exactly the same 891 dictionary (see inflateSetDictionary). 892 893 The dictionary should consist of strings (byte sequences) that are likely 894 to be encountered later in the data to be compressed, with the most commonly 895 used strings preferably put towards the end of the dictionary. Using a 896 dictionary is most useful when the data to be compressed is short and can be 897 predicted with good accuracy; the data can then be compressed better than 898 with the default empty dictionary. 899 900 Depending on the size of the compression data structures selected by 901 deflateInit or deflateInit2, a part of the dictionary may in effect be 902 discarded, for example if the dictionary is larger than the window size in 903 deflate or deflate2. Thus the strings most likely to be useful should be 904 put at the end of the dictionary, not at the front. In addition, the 905 current implementation of deflate will use at most the window size minus 906 262 bytes of the provided dictionary. 907 908 Upon return of this function, strm->adler is set to the adler32 value 909 of the dictionary; the decompressor may later use this value to determine 910 which dictionary has been used by the compressor. (The adler32 value 911 applies to the whole dictionary even if only a subset of the dictionary is 912 actually used by the compressor.) If a raw deflate was requested, then the 913 adler32 value is not computed and strm->adler is not set. 914 915 deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a 916 parameter is invalid (such as NULL dictionary) or the stream state is 917 inconsistent (for example if deflate has already been called for this stream 918 or if the compression method is bsort). deflateSetDictionary does not 919 perform any compression: this will be done by deflate(). 920 */ 921 922 ZEXTERN int ZEXPORT deflateCopy OF((z_streamp dest, 923 z_streamp source)); 924 /* 925 Sets the destination stream as a complete copy of the source stream. 926 927 This function can be useful when several compression strategies will be 928 tried, for example when there are several ways of pre-processing the input 929 data with a filter. The streams that will be discarded should then be freed 930 by calling deflateEnd. Note that deflateCopy duplicates the internal 931 compression state which can be quite large, so this strategy is slow and 932 can consume lots of memory. 933 934 deflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not 935 enough memory, Z_STREAM_ERROR if the source stream state was inconsistent 936 (such as zalloc being NULL). msg is left unchanged in both source and 937 destination. 938 */ 939 940 ZEXTERN int ZEXPORT deflateReset OF((z_streamp strm)); 941 /* 942 This function is equivalent to deflateEnd followed by deflateInit, 943 but does not free and reallocate all the internal compression state. 944 The stream will keep the same compression level and any other attributes 945 that may have been set by deflateInit2. 946 947 deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source 948 stream state was inconsistent (such as zalloc or state being NULL). 949 */ 950 951 ZEXTERN int ZEXPORT deflateParams OF((z_streamp strm, 952 int level, 953 int strategy)); 954 /* 955 Dynamically update the compression level and compression strategy. The 956 interpretation of level and strategy is as in deflateInit2. This can be 957 used to switch between compression and straight copy of the input data, or 958 to switch to a different kind of input data requiring a different 959 strategy. If the compression level is changed, the input available so far 960 is compressed with the old level (and may be flushed); the new level will 961 take effect only at the next call of deflate(). 962 963 Before the call of deflateParams, the stream state must be set as for 964 a call of deflate(), since the currently available input may have to 965 be compressed and flushed. In particular, strm->avail_out must be non-zero. 966 967 deflateParams returns Z_OK if success, Z_STREAM_ERROR if the source 968 stream state was inconsistent or if a parameter was invalid, Z_BUF_ERROR 969 if strm->avail_out was zero. 970 */ 971 972 ZEXTERN int ZEXPORT deflateTune OF((z_streamp strm, 973 int good_length, 974 int max_lazy, 975 int nice_length, 976 int max_chain)); 977 /* 978 Fine tune deflate's internal compression parameters. This should only be 979 used by someone who understands the algorithm used by zlib's deflate for 980 searching for the best matching string, and even then only by the most 981 fanatic optimizer trying to squeeze out the last compressed bit for their 982 specific input data. Read the deflate.c source code for the meaning of the 983 max_lazy, good_length, nice_length, and max_chain parameters. 984 985 deflateTune() can be called after deflateInit() or deflateInit2(), and 986 returns Z_OK on success, or Z_STREAM_ERROR for an invalid deflate stream. 987 */ 988 989 ZEXTERN uLong ZEXPORT deflateBound OF((z_streamp strm, 990 uLong sourceLen)); 991 /* 992 deflateBound() returns an upper bound on the compressed size after 993 deflation of sourceLen bytes. It must be called after deflateInit() 994 or deflateInit2(). This would be used to allocate an output buffer 995 for deflation in a single pass, and so would be called before deflate(). 996 */ 997 998 ZEXTERN int ZEXPORT deflatePrime OF((z_streamp strm, 999 int bits, 1000 int value)); 1001 /* 1002 deflatePrime() inserts bits in the deflate output stream. The intent 1003 is that this function is used to start off the deflate output with the 1004 bits leftover from a previous deflate stream when appending to it. As such, 1005 this function can only be used for raw deflate, and must be used before the 1006 first deflate() call after a deflateInit2() or deflateReset(). bits must be 1007 less than or equal to 16, and that many of the least significant bits of 1008 value will be inserted in the output. 1009 1010 deflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source 1011 stream state was inconsistent. 1012 */ 1013 1014 ZEXTERN int ZEXPORT deflateSetHeader OF((z_streamp strm, 1015 gz_headerp head)); 1016 /* 1017 deflateSetHeader() provides gzip header information for when a gzip 1018 stream is requested by deflateInit2(). deflateSetHeader() may be called 1019 after deflateInit2() or deflateReset() and before the first call of 1020 deflate(). The text, time, os, extra field, name, and comment information 1021 in the provided gz_header structure are written to the gzip header (xflag is 1022 ignored -- the extra flags are set according to the compression level). The 1023 caller must assure that, if not Z_NULL, name and comment are terminated with 1024 a zero byte, and that if extra is not Z_NULL, that extra_len bytes are 1025 available there. If hcrc is true, a gzip header crc is included. Note that 1026 the current versions of the command-line version of gzip (up through version 1027 1.3.x) do not support header crc's, and will report that it is a "multi-part 1028 gzip file" and give up. 1029 1030 If deflateSetHeader is not used, the default gzip header has text false, 1031 the time set to zero, and os set to 255, with no extra, name, or comment 1032 fields. The gzip header is returned to the default state by deflateReset(). 1033 1034 deflateSetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source 1035 stream state was inconsistent. 1036 */ 1037 1038 /* 1039 ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm, 1040 int windowBits)); 1041 1042 This is another version of inflateInit with an extra parameter. The 1043 fields next_in, avail_in, zalloc, zfree and opaque must be initialized 1044 before by the caller. 1045 1046 The windowBits parameter is the base two logarithm of the maximum window 1047 size (the size of the history buffer). It should be in the range 8..15 for 1048 this version of the library. The default value is 15 if inflateInit is used 1049 instead. windowBits must be greater than or equal to the windowBits value 1050 provided to deflateInit2() while compressing, or it must be equal to 15 if 1051 deflateInit2() was not used. If a compressed stream with a larger window 1052 size is given as input, inflate() will return with the error code 1053 Z_DATA_ERROR instead of trying to allocate a larger window. 1054 1055 windowBits can also be -8..-15 for raw inflate. In this case, -windowBits 1056 determines the window size. inflate() will then process raw deflate data, 1057 not looking for a zlib or gzip header, not generating a check value, and not 1058 looking for any check values for comparison at the end of the stream. This 1059 is for use with other formats that use the deflate compressed data format 1060 such as zip. Those formats provide their own check values. If a custom 1061 format is developed using the raw deflate format for compressed data, it is 1062 recommended that a check value such as an adler32 or a crc32 be applied to 1063 the uncompressed data as is done in the zlib, gzip, and zip formats. For 1064 most applications, the zlib format should be used as is. Note that comments 1065 above on the use in deflateInit2() applies to the magnitude of windowBits. 1066 1067 windowBits can also be greater than 15 for optional gzip decoding. Add 1068 32 to windowBits to enable zlib and gzip decoding with automatic header 1069 detection, or add 16 to decode only the gzip format (the zlib format will 1070 return a Z_DATA_ERROR). If a gzip stream is being decoded, strm->adler is 1071 a crc32 instead of an adler32. 1072 1073 inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough 1074 memory, Z_STREAM_ERROR if a parameter is invalid (such as a null strm). msg 1075 is set to null if there is no error message. inflateInit2 does not perform 1076 any decompression apart from reading the zlib header if present: this will 1077 be done by inflate(). (So next_in and avail_in may be modified, but next_out 1078 and avail_out are unchanged.) 1079 */ 1080 1081 ZEXTERN int ZEXPORT inflateSetDictionary OF((z_streamp strm, 1082 const Bytef *dictionary, 1083 uInt dictLength)); 1084 /* 1085 Initializes the decompression dictionary from the given uncompressed byte 1086 sequence. This function must be called immediately after a call of inflate, 1087 if that call returned Z_NEED_DICT. The dictionary chosen by the compressor 1088 can be determined from the adler32 value returned by that call of inflate. 1089 The compressor and decompressor must use exactly the same dictionary (see 1090 deflateSetDictionary). For raw inflate, this function can be called 1091 immediately after inflateInit2() or inflateReset() and before any call of 1092 inflate() to set the dictionary. The application must insure that the 1093 dictionary that was used for compression is provided. 1094 1095 inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a 1096 parameter is invalid (such as NULL dictionary) or the stream state is 1097 inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the 1098 expected one (incorrect adler32 value). inflateSetDictionary does not 1099 perform any decompression: this will be done by subsequent calls of 1100 inflate(). 1101 */ 1102 1103 ZEXTERN int ZEXPORT inflateSync OF((z_streamp strm)); 1104 /* 1105 Skips invalid compressed data until a full flush point (see above the 1106 description of deflate with Z_FULL_FLUSH) can be found, or until all 1107 available input is skipped. No output is provided. 1108 1109 inflateSync returns Z_OK if a full flush point has been found, Z_BUF_ERROR 1110 if no more input was provided, Z_DATA_ERROR if no flush point has been found, 1111 or Z_STREAM_ERROR if the stream structure was inconsistent. In the success 1112 case, the application may save the current current value of total_in which 1113 indicates where valid compressed data was found. In the error case, the 1114 application may repeatedly call inflateSync, providing more input each time, 1115 until success or end of the input data. 1116 */ 1117 1118 ZEXTERN int ZEXPORT inflateCopy OF((z_streamp dest, 1119 z_streamp source)); 1120 /* 1121 Sets the destination stream as a complete copy of the source stream. 1122 1123 This function can be useful when randomly accessing a large stream. The 1124 first pass through the stream can periodically record the inflate state, 1125 allowing restarting inflate at those points when randomly accessing the 1126 stream. 1127 1128 inflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not 1129 enough memory, Z_STREAM_ERROR if the source stream state was inconsistent 1130 (such as zalloc being NULL). msg is left unchanged in both source and 1131 destination. 1132 */ 1133 1134 ZEXTERN int ZEXPORT inflateReset OF((z_streamp strm)); 1135 /* 1136 This function is equivalent to inflateEnd followed by inflateInit, 1137 but does not free and reallocate all the internal decompression state. 1138 The stream will keep attributes that may have been set by inflateInit2. 1139 1140 inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source 1141 stream state was inconsistent (such as zalloc or state being NULL). 1142 */ 1143 1144 ZEXTERN int ZEXPORT netpgpv_inflatePrime OF((z_streamp strm, 1145 int bits, 1146 int value)); 1147 /* 1148 This function inserts bits in the inflate input stream. The intent is 1149 that this function is used to start inflating at a bit position in the 1150 middle of a byte. The provided bits will be used before any bytes are used 1151 from next_in. This function should only be used with raw inflate, and 1152 should be used before the first inflate() call after inflateInit2() or 1153 inflateReset(). bits must be less than or equal to 16, and that many of the 1154 least significant bits of value will be inserted in the input. 1155 1156 netpgpv_inflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source 1157 stream state was inconsistent. 1158 */ 1159 1160 ZEXTERN int ZEXPORT netpgpv_inflateGetHeader OF((z_streamp strm, 1161 gz_headerp head)); 1162 /* 1163 netpgpv_inflateGetHeader() requests that gzip header information be stored in the 1164 provided gz_header structure. netpgpv_inflateGetHeader() may be called after 1165 inflateInit2() or inflateReset(), and before the first call of inflate(). 1166 As inflate() processes the gzip stream, head->done is zero until the header 1167 is completed, at which time head->done is set to one. If a zlib stream is 1168 being decoded, then head->done is set to -1 to indicate that there will be 1169 no gzip header information forthcoming. Note that Z_BLOCK can be used to 1170 force inflate() to return immediately after header processing is complete 1171 and before any actual data is decompressed. 1172 1173 The text, time, xflags, and os fields are filled in with the gzip header 1174 contents. hcrc is set to true if there is a header CRC. (The header CRC 1175 was valid if done is set to one.) If extra is not Z_NULL, then extra_max 1176 contains the maximum number of bytes to write to extra. Once done is true, 1177 extra_len contains the actual extra field length, and extra contains the 1178 extra field, or that field truncated if extra_max is less than extra_len. 1179 If name is not Z_NULL, then up to name_max characters are written there, 1180 terminated with a zero unless the length is greater than name_max. If 1181 comment is not Z_NULL, then up to comm_max characters are written there, 1182 terminated with a zero unless the length is greater than comm_max. When 1183 any of extra, name, or comment are not Z_NULL and the respective field is 1184 not present in the header, then that field is set to Z_NULL to signal its 1185 absence. This allows the use of deflateSetHeader() with the returned 1186 structure to duplicate the header. However if those fields are set to 1187 allocated memory, then the application will need to save those pointers 1188 elsewhere so that they can be eventually freed. 1189 1190 If netpgpv_inflateGetHeader is not used, then the header information is simply 1191 discarded. The header is always checked for validity, including the header 1192 CRC if present. inflateReset() will reset the process to discard the header 1193 information. The application would need to call netpgpv_inflateGetHeader() again to 1194 retrieve the header from the next gzip stream. 1195 1196 netpgpv_inflateGetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source 1197 stream state was inconsistent. 1198 */ 1199 1200 /* 1201 ZEXTERN int ZEXPORT inflateBackInit OF((z_streamp strm, int windowBits, 1202 unsigned char FAR *window)); 1203 1204 Initialize the internal stream state for decompression using inflateBack() 1205 calls. The fields zalloc, zfree and opaque in strm must be initialized 1206 before the call. If zalloc and zfree are Z_NULL, then the default library- 1207 derived memory allocation routines are used. windowBits is the base two 1208 logarithm of the window size, in the range 8..15. window is a caller 1209 supplied buffer of that size. Except for special applications where it is 1210 assured that deflate was used with small window sizes, windowBits must be 15 1211 and a 32K byte window must be supplied to be able to decompress general 1212 deflate streams. 1213 1214 See inflateBack() for the usage of these routines. 1215 1216 inflateBackInit will return Z_OK on success, Z_STREAM_ERROR if any of 1217 the paramaters are invalid, Z_MEM_ERROR if the internal state could not 1218 be allocated, or Z_VERSION_ERROR if the version of the library does not 1219 match the version of the header file. 1220 */ 1221 1222 typedef unsigned (*in_func) OF((void FAR *, unsigned char FAR * FAR *)); 1223 typedef int (*out_func) OF((void FAR *, unsigned char FAR *, unsigned)); 1224 1225 ZEXTERN int ZEXPORT inflateBack OF((z_streamp strm, 1226 in_func in, void FAR *in_desc, 1227 out_func out, void FAR *out_desc)); 1228 /* 1229 inflateBack() does a raw inflate with a single call using a call-back 1230 interface for input and output. This is more efficient than inflate() for 1231 file i/o applications in that it avoids copying between the output and the 1232 sliding window by simply making the window itself the output buffer. This 1233 function trusts the application to not change the output buffer passed by 1234 the output function, at least until inflateBack() returns. 1235 1236 inflateBackInit() must be called first to allocate the internal state 1237 and to initialize the state with the user-provided window buffer. 1238 inflateBack() may then be used multiple times to inflate a complete, raw 1239 deflate stream with each call. inflateBackEnd() is then called to free 1240 the allocated state. 1241 1242 A raw deflate stream is one with no zlib or gzip header or trailer. 1243 This routine would normally be used in a utility that reads zip or gzip 1244 files and writes out uncompressed files. The utility would decode the 1245 header and process the trailer on its own, hence this routine expects 1246 only the raw deflate stream to decompress. This is different from the 1247 normal behavior of inflate(), which expects either a zlib or gzip header and 1248 trailer around the deflate stream. 1249 1250 inflateBack() uses two subroutines supplied by the caller that are then 1251 called by inflateBack() for input and output. inflateBack() calls those 1252 routines until it reads a complete deflate stream and writes out all of the 1253 uncompressed data, or until it encounters an error. The function's 1254 parameters and return types are defined above in the in_func and out_func 1255 typedefs. inflateBack() will call in(in_desc, &buf) which should return the 1256 number of bytes of provided input, and a pointer to that input in buf. If 1257 there is no input available, in() must return zero--buf is ignored in that 1258 case--and inflateBack() will return a buffer error. inflateBack() will call 1259 out(out_desc, buf, len) to write the uncompressed data buf[0..len-1]. out() 1260 should return zero on success, or non-zero on failure. If out() returns 1261 non-zero, inflateBack() will return with an error. Neither in() nor out() 1262 are permitted to change the contents of the window provided to 1263 inflateBackInit(), which is also the buffer that out() uses to write from. 1264 The length written by out() will be at most the window size. Any non-zero 1265 amount of input may be provided by in(). 1266 1267 For convenience, inflateBack() can be provided input on the first call by 1268 setting strm->next_in and strm->avail_in. If that input is exhausted, then 1269 in() will be called. Therefore strm->next_in must be initialized before 1270 calling inflateBack(). If strm->next_in is Z_NULL, then in() will be called 1271 immediately for input. If strm->next_in is not Z_NULL, then strm->avail_in 1272 must also be initialized, and then if strm->avail_in is not zero, input will 1273 initially be taken from strm->next_in[0 .. strm->avail_in - 1]. 1274 1275 The in_desc and out_desc parameters of inflateBack() is passed as the 1276 first parameter of in() and out() respectively when they are called. These 1277 descriptors can be optionally used to pass any information that the caller- 1278 supplied in() and out() functions need to do their job. 1279 1280 On return, inflateBack() will set strm->next_in and strm->avail_in to 1281 pass back any unused input that was provided by the last in() call. The 1282 return values of inflateBack() can be Z_STREAM_END on success, Z_BUF_ERROR 1283 if in() or out() returned an error, Z_DATA_ERROR if there was a format 1284 error in the deflate stream (in which case strm->msg is set to indicate the 1285 nature of the error), or Z_STREAM_ERROR if the stream was not properly 1286 initialized. In the case of Z_BUF_ERROR, an input or output error can be 1287 distinguished using strm->next_in which will be Z_NULL only if in() returned 1288 an error. If strm->next is not Z_NULL, then the Z_BUF_ERROR was due to 1289 out() returning non-zero. (in() will always be called before out(), so 1290 strm->next_in is assured to be defined if out() returns non-zero.) Note 1291 that inflateBack() cannot return Z_OK. 1292 */ 1293 1294 ZEXTERN int ZEXPORT inflateBackEnd OF((z_streamp strm)); 1295 /* 1296 All memory allocated by inflateBackInit() is freed. 1297 1298 inflateBackEnd() returns Z_OK on success, or Z_STREAM_ERROR if the stream 1299 state was inconsistent. 1300 */ 1301 1302 ZEXTERN uLong ZEXPORT zlibCompileFlags OF((void)); 1303 /* Return flags indicating compile-time options. 1304 1305 Type sizes, two bits each, 00 = 16 bits, 01 = 32, 10 = 64, 11 = other: 1306 1.0: size of uInt 1307 3.2: size of uLong 1308 5.4: size of voidpf (pointer) 1309 7.6: size of z_off_t 1310 1311 Compiler, assembler, and debug options: 1312 8: ZLIB_DEBUG 1313 9: ASMV or ASMINF -- use ASM code 1314 10: ZLIB_WINAPI -- exported functions use the WINAPI calling convention 1315 11: 0 (reserved) 1316 1317 One-time table building (smaller code, but not thread-safe if true): 1318 12: BUILDFIXED -- build static block decoding tables when needed 1319 13: DYNAMIC_CRC_TABLE -- build CRC calculation tables when needed 1320 14,15: 0 (reserved) 1321 1322 Library content (indicates missing functionality): 1323 16: NO_GZCOMPRESS -- gz* functions cannot compress (to avoid linking 1324 deflate code when not needed) 1325 17: NO_GZIP -- deflate can't write gzip streams, and inflate can't detect 1326 and decode gzip streams (to avoid linking crc code) 1327 18-19: 0 (reserved) 1328 1329 Operation variations (changes in library functionality): 1330 20: PKZIP_BUG_WORKAROUND -- slightly more permissive inflate 1331 21: FASTEST -- deflate algorithm with only one, lowest compression level 1332 22,23: 0 (reserved) 1333 1334 The sprintf variant used by gzprintf (zero is best): 1335 24: 0 = vs*, 1 = s* -- 1 means limited to 20 arguments after the format 1336 25: 0 = *nprintf, 1 = *printf -- 1 means gzprintf() not secure! 1337 26: 0 = returns value, 1 = void -- 1 means inferred string length returned 1338 1339 Remainder: 1340 27-31: 0 (reserved) 1341 */ 1342 1343 1344 /* utility functions */ 1345 1346 /* 1347 The following utility functions are implemented on top of the 1348 basic stream-oriented functions. To simplify the interface, some 1349 default options are assumed (compression level and memory usage, 1350 standard memory allocation functions). The source code of these 1351 utility functions can easily be modified if you need special options. 1352 */ 1353 1354 ZEXTERN int ZEXPORT compress OF((Bytef *dest, uLongf *destLen, 1355 const Bytef *source, uLong sourceLen)); 1356 /* 1357 Compresses the source buffer into the destination buffer. sourceLen is 1358 the byte length of the source buffer. Upon entry, destLen is the total 1359 size of the destination buffer, which must be at least the value returned 1360 by compressBound(sourceLen). Upon exit, destLen is the actual size of the 1361 compressed buffer. 1362 This function can be used to compress a whole file at once if the 1363 input file is mmap'ed. 1364 compress returns Z_OK if success, Z_MEM_ERROR if there was not 1365 enough memory, Z_BUF_ERROR if there was not enough room in the output 1366 buffer. 1367 */ 1368 1369 ZEXTERN int ZEXPORT compress2 OF((Bytef *dest, uLongf *destLen, 1370 const Bytef *source, uLong sourceLen, 1371 int level)); 1372 /* 1373 Compresses the source buffer into the destination buffer. The level 1374 parameter has the same meaning as in deflateInit. sourceLen is the byte 1375 length of the source buffer. Upon entry, destLen is the total size of the 1376 destination buffer, which must be at least the value returned by 1377 compressBound(sourceLen). Upon exit, destLen is the actual size of the 1378 compressed buffer. 1379 1380 compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough 1381 memory, Z_BUF_ERROR if there was not enough room in the output buffer, 1382 Z_STREAM_ERROR if the level parameter is invalid. 1383 */ 1384 1385 ZEXTERN uLong ZEXPORT compressBound OF((uLong sourceLen)); 1386 /* 1387 compressBound() returns an upper bound on the compressed size after 1388 compress() or compress2() on sourceLen bytes. It would be used before 1389 a compress() or compress2() call to allocate the destination buffer. 1390 */ 1391 1392 ZEXTERN int ZEXPORT uncompress OF((Bytef *dest, uLongf *destLen, 1393 const Bytef *source, uLong sourceLen)); 1394 /* 1395 Decompresses the source buffer into the destination buffer. sourceLen is 1396 the byte length of the source buffer. Upon entry, destLen is the total 1397 size of the destination buffer, which must be large enough to hold the 1398 entire uncompressed data. (The size of the uncompressed data must have 1399 been saved previously by the compressor and transmitted to the decompressor 1400 by some mechanism outside the scope of this compression library.) 1401 Upon exit, destLen is the actual size of the compressed buffer. 1402 This function can be used to decompress a whole file at once if the 1403 input file is mmap'ed. 1404 1405 uncompress returns Z_OK if success, Z_MEM_ERROR if there was not 1406 enough memory, Z_BUF_ERROR if there was not enough room in the output 1407 buffer, or Z_DATA_ERROR if the input data was corrupted or incomplete. 1408 */ 1409 1410 1411 typedef voidp gzFile; 1412 1413 ZEXTERN gzFile ZEXPORT gzopen OF((const char *path, const char *mode)); 1414 /* 1415 Opens a gzip (.gz) file for reading or writing. The mode parameter 1416 is as in fopen ("rb" or "wb") but can also include a compression level 1417 ("wb9") or a strategy: 'f' for filtered data as in "wb6f", 'h' for 1418 Huffman only compression as in "wb1h", or 'R' for run-length encoding 1419 as in "wb1R". (See the description of deflateInit2 for more information 1420 about the strategy parameter.) 1421 1422 gzopen can be used to read a file which is not in gzip format; in this 1423 case gzread will directly read from the file without decompression. 1424 1425 gzopen returns NULL if the file could not be opened or if there was 1426 insufficient memory to allocate the (de)compression state; errno 1427 can be checked to distinguish the two cases (if errno is zero, the 1428 zlib error is Z_MEM_ERROR). */ 1429 1430 ZEXTERN gzFile ZEXPORT gzdopen OF((int fd, const char *mode)); 1431 /* 1432 gzdopen() associates a gzFile with the file descriptor fd. File 1433 descriptors are obtained from calls like open, dup, creat, pipe or 1434 fileno (in the file has been previously opened with fopen). 1435 The mode parameter is as in gzopen. 1436 The next call of gzclose on the returned gzFile will also close the 1437 file descriptor fd, just like fclose(fdopen(fd), mode) closes the file 1438 descriptor fd. If you want to keep fd open, use gzdopen(dup(fd), mode). 1439 gzdopen returns NULL if there was insufficient memory to allocate 1440 the (de)compression state. 1441 */ 1442 1443 ZEXTERN int ZEXPORT gzsetparams OF((gzFile file, int level, int strategy)); 1444 /* 1445 Dynamically update the compression level or strategy. See the description 1446 of deflateInit2 for the meaning of these parameters. 1447 gzsetparams returns Z_OK if success, or Z_STREAM_ERROR if the file was not 1448 opened for writing. 1449 */ 1450 1451 ZEXTERN int ZEXPORT gzread OF((gzFile file, voidp buf, unsigned len)); 1452 /* 1453 Reads the given number of uncompressed bytes from the compressed file. 1454 If the input file was not in gzip format, gzread copies the given number 1455 of bytes into the buffer. 1456 gzread returns the number of uncompressed bytes actually read (0 for 1457 end of file, -1 for error). */ 1458 1459 ZEXTERN int ZEXPORT gzwrite OF((gzFile file, 1460 voidpc buf, unsigned len)); 1461 /* 1462 Writes the given number of uncompressed bytes into the compressed file. 1463 gzwrite returns the number of uncompressed bytes actually written 1464 (0 in case of error). 1465 */ 1466 1467 ZEXTERN int ZEXPORTVA gzprintf OF((gzFile file, const char *format, ...)); 1468 /* 1469 Converts, formats, and writes the args to the compressed file under 1470 control of the format string, as in fprintf. gzprintf returns the number of 1471 uncompressed bytes actually written (0 in case of error). The number of 1472 uncompressed bytes written is limited to 4095. The caller should assure that 1473 this limit is not exceeded. If it is exceeded, then gzprintf() will return 1474 return an error (0) with nothing written. In this case, there may also be a 1475 buffer overflow with unpredictable consequences, which is possible only if 1476 zlib was compiled with the insecure functions sprintf() or vsprintf() 1477 because the secure snprintf() or vsnprintf() functions were not available. 1478 */ 1479 1480 ZEXTERN int ZEXPORT gzputs OF((gzFile file, const char *s)); 1481 /* 1482 Writes the given null-terminated string to the compressed file, excluding 1483 the terminating null character. 1484 gzputs returns the number of characters written, or -1 in case of error. 1485 */ 1486 1487 ZEXTERN char * ZEXPORT gzgets OF((gzFile file, char *buf, int len)); 1488 /* 1489 Reads bytes from the compressed file until len-1 characters are read, or 1490 a newline character is read and transferred to buf, or an end-of-file 1491 condition is encountered. The string is then terminated with a null 1492 character. 1493 gzgets returns buf, or Z_NULL in case of error. 1494 */ 1495 1496 ZEXTERN int ZEXPORT gzputc OF((gzFile file, int c)); 1497 /* 1498 Writes c, converted to an unsigned char, into the compressed file. 1499 gzputc returns the value that was written, or -1 in case of error. 1500 */ 1501 1502 ZEXTERN int ZEXPORT gzgetc OF((gzFile file)); 1503 /* 1504 Reads one byte from the compressed file. gzgetc returns this byte 1505 or -1 in case of end of file or error. 1506 */ 1507 1508 ZEXTERN int ZEXPORT gzungetc OF((int c, gzFile file)); 1509 /* 1510 Push one character back onto the stream to be read again later. 1511 Only one character of push-back is allowed. gzungetc() returns the 1512 character pushed, or -1 on failure. gzungetc() will fail if a 1513 character has been pushed but not read yet, or if c is -1. The pushed 1514 character will be discarded if the stream is repositioned with gzseek() 1515 or gzrewind(). 1516 */ 1517 1518 ZEXTERN int ZEXPORT gzflush OF((gzFile file, int flush)); 1519 /* 1520 Flushes all pending output into the compressed file. The parameter 1521 flush is as in the deflate() function. The return value is the zlib 1522 error number (see function gzerror below). gzflush returns Z_OK if 1523 the flush parameter is Z_FINISH and all output could be flushed. 1524 gzflush should be called only when strictly necessary because it can 1525 degrade compression. 1526 */ 1527 1528 ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile file, 1529 z_off_t offset, int whence)); 1530 /* 1531 Sets the starting position for the next gzread or gzwrite on the 1532 given compressed file. The offset represents a number of bytes in the 1533 uncompressed data stream. The whence parameter is defined as in lseek(2); 1534 the value SEEK_END is not supported. 1535 If the file is opened for reading, this function is emulated but can be 1536 extremely slow. If the file is opened for writing, only forward seeks are 1537 supported; gzseek then compresses a sequence of zeroes up to the new 1538 starting position. 1539 1540 gzseek returns the resulting offset location as measured in bytes from 1541 the beginning of the uncompressed stream, or -1 in case of error, in 1542 particular if the file is opened for writing and the new starting position 1543 would be before the current position. 1544 */ 1545 1546 ZEXTERN int ZEXPORT gzrewind OF((gzFile file)); 1547 /* 1548 Rewinds the given file. This function is supported only for reading. 1549 1550 gzrewind(file) is equivalent to (int)gzseek(file, 0L, SEEK_SET) 1551 */ 1552 1553 ZEXTERN z_off_t ZEXPORT gztell OF((gzFile file)); 1554 /* 1555 Returns the starting position for the next gzread or gzwrite on the 1556 given compressed file. This position represents a number of bytes in the 1557 uncompressed data stream. 1558 1559 gztell(file) is equivalent to gzseek(file, 0L, SEEK_CUR) 1560 */ 1561 1562 ZEXTERN int ZEXPORT gzeof OF((gzFile file)); 1563 /* 1564 Returns 1 when EOF has previously been detected reading the given 1565 input stream, otherwise zero. 1566 */ 1567 1568 ZEXTERN int ZEXPORT gzdirect OF((gzFile file)); 1569 /* 1570 Returns 1 if file is being read directly without decompression, otherwise 1571 zero. 1572 */ 1573 1574 ZEXTERN int ZEXPORT gzclose OF((gzFile file)); 1575 /* 1576 Flushes all pending output if necessary, closes the compressed file 1577 and deallocates all the (de)compression state. The return value is the zlib 1578 error number (see function gzerror below). 1579 */ 1580 1581 ZEXTERN const char * ZEXPORT gzerror OF((gzFile file, int *errnum)); 1582 /* 1583 Returns the error message for the last error which occurred on the 1584 given compressed file. errnum is set to zlib error number. If an 1585 error occurred in the file system and not in the compression library, 1586 errnum is set to Z_ERRNO and the application may consult errno 1587 to get the exact error code. 1588 */ 1589 1590 ZEXTERN void ZEXPORT gzclearerr OF((gzFile file)); 1591 /* 1592 Clears the error and end-of-file flags for file. This is analogous to the 1593 clearerr() function in stdio. This is useful for continuing to read a gzip 1594 file that is being written concurrently. 1595 */ 1596 1597 /* checksum functions */ 1598 1599 /* 1600 These functions are not related to compression but are exported 1601 anyway because they might be useful in applications using the 1602 compression library. 1603 */ 1604 1605 ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len)); 1606 /* 1607 Update a running Adler-32 checksum with the bytes buf[0..len-1] and 1608 return the updated checksum. If buf is NULL, this function returns 1609 the required initial value for the checksum. 1610 An Adler-32 checksum is almost as reliable as a CRC32 but can be computed 1611 much faster. Usage example: 1612 1613 uLong adler = adler32(0L, Z_NULL, 0); 1614 1615 while (read_buffer(buffer, length) != EOF) { 1616 adler = adler32(adler, buffer, length); 1617 } 1618 if (adler != original_adler) error(); 1619 */ 1620 1621 ZEXTERN uLong ZEXPORT adler32_combine OF((uLong adler1, uLong adler2, 1622 z_off_t len2)); 1623 /* 1624 Combine two Adler-32 checksums into one. For two sequences of bytes, seq1 1625 and seq2 with lengths len1 and len2, Adler-32 checksums were calculated for 1626 each, adler1 and adler2. adler32_combine() returns the Adler-32 checksum of 1627 seq1 and seq2 concatenated, requiring only adler1, adler2, and len2. 1628 */ 1629 1630 #if !defined(_KERNEL) && !defined(_STANDALONE) 1631 ZEXTERN uLong ZEXPORT crc32 OF((uLong crc, const Bytef *buf, uInt len)); 1632 #endif 1633 /* 1634 Update a running CRC-32 with the bytes buf[0..len-1] and return the 1635 updated CRC-32. If buf is NULL, this function returns the required initial 1636 value for the for the crc. Pre- and post-conditioning (one's complement) is 1637 performed within this function so it shouldn't be done by the application. 1638 Usage example: 1639 1640 uLong crc = crc32(0L, Z_NULL, 0); 1641 1642 while (read_buffer(buffer, length) != EOF) { 1643 crc = crc32(crc, buffer, length); 1644 } 1645 if (crc != original_crc) error(); 1646 */ 1647 1648 ZEXTERN uLong ZEXPORT crc32_combine OF((uLong crc1, uLong crc2, z_off_t len2)); 1649 1650 /* 1651 Combine two CRC-32 check values into one. For two sequences of bytes, 1652 seq1 and seq2 with lengths len1 and len2, CRC-32 check values were 1653 calculated for each, crc1 and crc2. crc32_combine() returns the CRC-32 1654 check value of seq1 and seq2 concatenated, requiring only crc1, crc2, and 1655 len2. 1656 */ 1657 1658 1659 /* various hacks, don't look :) */ 1660 1661 /* deflateInit and inflateInit are macros to allow checking the zlib version 1662 * and the compiler's view of z_stream: 1663 */ 1664 ZEXTERN int ZEXPORT deflateInit_ OF((z_streamp strm, int level, 1665 const char *version, int stream_size)); 1666 ZEXTERN int ZEXPORT inflateInit_ OF((z_streamp strm, 1667 const char *version, int stream_size)); 1668 ZEXTERN int ZEXPORT deflateInit2_ OF((z_streamp strm, int level, int method, 1669 int windowBits, int memLevel, 1670 int strategy, const char *version, 1671 int stream_size)); 1672 ZEXTERN int ZEXPORT inflateInit2_ OF((z_streamp strm, int windowBits, 1673 const char *version, int stream_size)); 1674 ZEXTERN int ZEXPORT inflateBackInit_ OF((z_streamp strm, int windowBits, 1675 unsigned char FAR *window, 1676 const char *version, 1677 int stream_size)); 1678 #define deflateInit(strm, level) \ 1679 deflateInit_((strm), (level), ZLIB_VERSION, sizeof(z_stream)) 1680 #define inflateInit(strm) \ 1681 inflateInit_((strm), ZLIB_VERSION, sizeof(z_stream)) 1682 #define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \ 1683 deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\ 1684 (strategy), ZLIB_VERSION, sizeof(z_stream)) 1685 #define inflateInit2(strm, windowBits) \ 1686 inflateInit2_((strm), (windowBits), ZLIB_VERSION, sizeof(z_stream)) 1687 #define inflateBackInit(strm, windowBits, window) \ 1688 inflateBackInit_((strm), (windowBits), (window), \ 1689 ZLIB_VERSION, sizeof(z_stream)) 1690 1691 1692 #if !defined(ZUTIL_H) && !defined(NO_DUMMY_DECL) 1693 struct internal_state {int dummy;}; /* hack for buggy compilers */ 1694 #endif 1695 1696 ZEXTERN const char * ZEXPORT zError OF((int)); 1697 ZEXTERN int ZEXPORT inflateSyncPoint OF((z_streamp z)); 1698 ZEXTERN const uLongf * ZEXPORT get_crc_table OF((void)); 1699 1700 #ifdef __cplusplus 1701 } 1702 #endif 1703 1704 #endif /* ZLIB_H */ 1705