150477Speter/* $FreeBSD$ */ 228415Speter 328415Speter/* 434768Speter * This file is derived from zlib.h and zconf.h from the zlib-1.0.4 528415Speter * distribution by Jean-loup Gailly and Mark Adler, with some additions 628415Speter * by Paul Mackerras to aid in implementing Deflate compression and 728415Speter * decompression for PPP packets. 828415Speter */ 928415Speter 1028415Speter/* 1134768Speter * ==FILEVERSION 971127== 1228415Speter * 1328415Speter * This marker is used by the Linux installation script to determine 1428415Speter * whether an up-to-date version of this file is already installed. 1528415Speter */ 1628415Speter 1734768Speter 1834768Speter/* +++ zlib.h */ 19139823Simp/*- 20139823Simp zlib.h -- interface of the 'zlib' general purpose compression library 2134768Speter version 1.0.4, Jul 24th, 1996. 2228415Speter 2334768Speter Copyright (C) 1995-1996 Jean-loup Gailly and Mark Adler 2428415Speter 2528415Speter This software is provided 'as-is', without any express or implied 2628415Speter warranty. In no event will the authors be held liable for any damages 2728415Speter arising from the use of this software. 2828415Speter 2928415Speter Permission is granted to anyone to use this software for any purpose, 3028415Speter including commercial applications, and to alter it and redistribute it 3128415Speter freely, subject to the following restrictions: 3228415Speter 3328415Speter 1. The origin of this software must not be misrepresented; you must not 3428415Speter claim that you wrote the original software. If you use this software 3528415Speter in a product, an acknowledgment in the product documentation would be 3628415Speter appreciated but is not required. 3728415Speter 2. Altered source versions must be plainly marked as such, and must not be 3828415Speter misrepresented as being the original software. 3928415Speter 3. This notice may not be removed or altered from any source distribution. 4028415Speter 4128415Speter Jean-loup Gailly Mark Adler 4228415Speter gzip@prep.ai.mit.edu madler@alumni.caltech.edu 43139823Simp*/ 44139823Simp/* 4534768Speter The data format used by the zlib library is described by RFCs (Request for 4634768Speter Comments) 1950 to 1952 in the files ftp://ds.internic.net/rfc/rfc1950.txt 4734768Speter (zlib format), rfc1951.txt (deflate format) and rfc1952.txt (gzip format). 4834768Speter*/ 4934768Speter 5028415Speter#ifndef _ZLIB_H 5128415Speter#define _ZLIB_H 5228415Speter 5334768Speter#ifdef __cplusplus 5434768Speterextern "C" { 5534768Speter#endif 5628415Speter 5734768Speter 5834768Speter/* +++ zconf.h */ 5928415Speter/* zconf.h -- configuration of the zlib compression library 6034768Speter * Copyright (C) 1995-1996 Jean-loup Gailly. 6128415Speter * For conditions of distribution and use, see copyright notice in zlib.h 6228415Speter */ 6328415Speter 6434768Speter/* From: zconf.h,v 1.20 1996/07/02 15:09:28 me Exp $ */ 6528415Speter 6634768Speter#ifndef _ZCONF_H 6734768Speter#define _ZCONF_H 6834768Speter 6928415Speter/* 7034768Speter * If you *really* need a unique prefix for all types and library functions, 7134768Speter * compile with -DZ_PREFIX. The "standard" zlib should be compiled without it. 7228415Speter */ 7334768Speter#ifdef Z_PREFIX 7434768Speter# define deflateInit_ z_deflateInit_ 7534768Speter# define deflate z_deflate 7634768Speter# define deflateEnd z_deflateEnd 7734768Speter# define inflateInit_ z_inflateInit_ 7834768Speter# define inflate z_inflate 7934768Speter# define inflateEnd z_inflateEnd 8034768Speter# define deflateInit2_ z_deflateInit2_ 8134768Speter# define deflateSetDictionary z_deflateSetDictionary 8234768Speter# define deflateCopy z_deflateCopy 8334768Speter# define deflateReset z_deflateReset 8434768Speter# define deflateParams z_deflateParams 8534768Speter# define inflateInit2_ z_inflateInit2_ 8634768Speter# define inflateSetDictionary z_inflateSetDictionary 8734768Speter# define inflateSync z_inflateSync 8834768Speter# define inflateReset z_inflateReset 8934768Speter# define compress z_compress 9034768Speter# define uncompress z_uncompress 9134768Speter# define adler32 z_adler32 9297512Sphk#if 0 9334768Speter# define crc32 z_crc32 9434768Speter# define get_crc_table z_get_crc_table 9597512Sphk#endif 9628415Speter 9734768Speter# define Byte z_Byte 9834768Speter# define uInt z_uInt 9934768Speter# define uLong z_uLong 10034768Speter# define Bytef z_Bytef 10134768Speter# define charf z_charf 10234768Speter# define intf z_intf 10334768Speter# define uIntf z_uIntf 10434768Speter# define uLongf z_uLongf 10534768Speter# define voidpf z_voidpf 10634768Speter# define voidp z_voidp 10734768Speter#endif 10834768Speter 10934768Speter#if (defined(_WIN32) || defined(__WIN32__)) && !defined(WIN32) 11034768Speter# define WIN32 11134768Speter#endif 112231678Stijl#if defined(__GNUC__) || defined(WIN32) || defined(__386__) || defined(__i386__) 11334768Speter# ifndef __32BIT__ 11434768Speter# define __32BIT__ 11534768Speter# endif 11634768Speter#endif 11734768Speter#if defined(__MSDOS__) && !defined(MSDOS) 11834768Speter# define MSDOS 11934768Speter#endif 12034768Speter 12128415Speter/* 12228415Speter * Compile with -DMAXSEG_64K if the alloc function cannot allocate more 12328415Speter * than 64k bytes at a time (needed on systems with 16-bit int). 12428415Speter */ 12534768Speter#if defined(MSDOS) && !defined(__32BIT__) 12634768Speter# define MAXSEG_64K 12734768Speter#endif 12834768Speter#ifdef MSDOS 12934768Speter# define UNALIGNED_OK 13034768Speter#endif 13128415Speter 13234768Speter#if (defined(MSDOS) || defined(_WINDOWS) || defined(WIN32)) && !defined(STDC) 13334768Speter# define STDC 13434768Speter#endif 13534768Speter#if (defined(__STDC__) || defined(__cplusplus)) && !defined(STDC) 13634768Speter# define STDC 13734768Speter#endif 13834768Speter 13928415Speter#ifndef STDC 14034768Speter# ifndef const /* cannot use !defined(STDC) && !defined(const) on Mac */ 14134768Speter# define const 14228415Speter# endif 14328415Speter#endif 14428415Speter 14534768Speter/* Some Mac compilers merge all .h files incorrectly: */ 14634768Speter#if defined(__MWERKS__) || defined(applec) ||defined(THINK_C) ||defined(__SC__) 14734768Speter# define NO_DUMMY_DECL 14828415Speter#endif 14928415Speter 15028415Speter/* Maximum value for memLevel in deflateInit2 */ 15128415Speter#ifndef MAX_MEM_LEVEL 15228415Speter# ifdef MAXSEG_64K 15328415Speter# define MAX_MEM_LEVEL 8 15428415Speter# else 15528415Speter# define MAX_MEM_LEVEL 9 15628415Speter# endif 15728415Speter#endif 15828415Speter 15928415Speter/* Maximum value for windowBits in deflateInit2 and inflateInit2 */ 16028415Speter#ifndef MAX_WBITS 16128415Speter# define MAX_WBITS 15 /* 32K LZ77 window */ 16228415Speter#endif 16328415Speter 16428415Speter/* The memory requirements for deflate are (in bytes): 16528415Speter 1 << (windowBits+2) + 1 << (memLevel+9) 16628415Speter that is: 128K for windowBits=15 + 128K for memLevel = 8 (default values) 16728415Speter plus a few kilobytes for small objects. For example, if you want to reduce 16828415Speter the default memory requirements from 256K to 128K, compile with 16928415Speter make CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7" 17028415Speter Of course this will generally degrade compression (there's no free lunch). 17128415Speter 17228415Speter The memory requirements for inflate are (in bytes) 1 << windowBits 17328415Speter that is, 32K for windowBits=15 (default value) plus a few kilobytes 17428415Speter for small objects. 17528415Speter*/ 17628415Speter 17728415Speter /* Type declarations */ 17828415Speter 17928415Speter#ifndef OF /* function prototypes */ 18028415Speter# ifdef STDC 18128415Speter# define OF(args) args 18228415Speter# else 18328415Speter# define OF(args) () 18428415Speter# endif 18528415Speter#endif 18628415Speter 18734768Speter/* The following definitions for FAR are needed only for MSDOS mixed 18834768Speter * model programming (small or medium model with some far allocations). 18934768Speter * This was tested only with MSC; for other MSDOS compilers you may have 19034768Speter * to define NO_MEMCPY in zutil.h. If you don't need the mixed model, 19134768Speter * just define FAR to be empty. 19234768Speter */ 19334768Speter#if (defined(M_I86SM) || defined(M_I86MM)) && !defined(__32BIT__) 19434768Speter /* MSC small or medium model */ 19534768Speter# define SMALL_MEDIUM 19634768Speter# ifdef _MSC_VER 19734768Speter# define FAR __far 19834768Speter# else 19934768Speter# define FAR far 20034768Speter# endif 20134768Speter#endif 20234768Speter#if defined(__BORLANDC__) && (defined(__SMALL__) || defined(__MEDIUM__)) 20334768Speter# ifndef __32BIT__ 20434768Speter# define SMALL_MEDIUM 20534768Speter# define FAR __far 20634768Speter# endif 20734768Speter#endif 20834768Speter#ifndef FAR 20934768Speter# define FAR 21034768Speter#endif 21134768Speter 21228415Spetertypedef unsigned char Byte; /* 8 bits */ 21328415Spetertypedef unsigned int uInt; /* 16 bits or more */ 21428415Spetertypedef unsigned long uLong; /* 32 bits or more */ 21528415Speter 21634768Speter#if defined(__BORLANDC__) && defined(SMALL_MEDIUM) 21734768Speter /* Borland C/C++ ignores FAR inside typedef */ 21834768Speter# define Bytef Byte FAR 21934768Speter#else 22034768Speter typedef Byte FAR Bytef; 22134768Speter#endif 22234768Spetertypedef char FAR charf; 22334768Spetertypedef int FAR intf; 22434768Spetertypedef uInt FAR uIntf; 22528415Spetertypedef uLong FAR uLongf; 22628415Speter 22728415Speter#ifdef STDC 22828415Speter typedef void FAR *voidpf; 22928415Speter typedef void *voidp; 23028415Speter#else 23128415Speter typedef Byte FAR *voidpf; 23228415Speter typedef Byte *voidp; 23328415Speter#endif 23428415Speter 23528415Speter 23634768Speter/* Compile with -DZLIB_DLL for Windows DLL support */ 23734768Speter#if (defined(_WINDOWS) || defined(WINDOWS)) && defined(ZLIB_DLL) 23834768Speter# include <windows.h> 23934768Speter# define EXPORT WINAPI 24034768Speter#else 24134768Speter# define EXPORT 24234768Speter#endif 24328415Speter 24434768Speter#endif /* _ZCONF_H */ 24534768Speter/* --- zconf.h */ 24634768Speter 24734768Speter#define ZLIB_VERSION "1.0.4P" 24834768Speter 24928415Speter/* 25028415Speter The 'zlib' compression library provides in-memory compression and 25128415Speter decompression functions, including integrity checks of the uncompressed 25228415Speter data. This version of the library supports only one compression method 25328415Speter (deflation) but other algorithms may be added later and will have the same 25428415Speter stream interface. 25528415Speter 25628415Speter For compression the application must provide the output buffer and 25728415Speter may optionally provide the input buffer for optimization. For decompression, 25828415Speter the application must provide the input buffer and may optionally provide 25928415Speter the output buffer for optimization. 26028415Speter 26128415Speter Compression can be done in a single step if the buffers are large 26228415Speter enough (for example if an input file is mmap'ed), or can be done by 26328415Speter repeated calls of the compression function. In the latter case, the 26428415Speter application must provide more input and/or consume the output 26528415Speter (providing more output space) before each call. 26634768Speter 26734768Speter The library does not install any signal handler. It is recommended to 26834768Speter add at least a handler for SIGSEGV when decompressing; the library checks 26934768Speter the consistency of the input data whenever possible but may go nuts 27034768Speter for some forms of corrupted input. 27128415Speter*/ 27228415Speter 27328415Spetertypedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size)); 27434768Spetertypedef void (*free_func) OF((voidpf opaque, voidpf address)); 27528415Speter 27628415Speterstruct internal_state; 27728415Speter 27828415Spetertypedef struct z_stream_s { 27928415Speter Bytef *next_in; /* next input byte */ 28028415Speter uInt avail_in; /* number of bytes available at next_in */ 28128415Speter uLong total_in; /* total nb of input bytes read so far */ 28228415Speter 28328415Speter Bytef *next_out; /* next output byte should be put there */ 28428415Speter uInt avail_out; /* remaining free space at next_out */ 28528415Speter uLong total_out; /* total nb of bytes output so far */ 28628415Speter 28743305Sdillon const char *msg; /* last error message, NULL if no error */ 28828415Speter struct internal_state FAR *state; /* not visible by applications */ 28928415Speter 29028415Speter alloc_func zalloc; /* used to allocate the internal state */ 29128415Speter free_func zfree; /* used to free the internal state */ 29234768Speter voidpf opaque; /* private data object passed to zalloc and zfree */ 29328415Speter 29434768Speter int data_type; /* best guess about the data type: ascii or binary */ 29534768Speter uLong adler; /* adler32 value of the uncompressed data */ 29634768Speter uLong reserved; /* reserved for future use */ 29728415Speter} z_stream; 29828415Speter 29934768Spetertypedef z_stream FAR *z_streamp; 30034768Speter 30128415Speter/* 30228415Speter The application must update next_in and avail_in when avail_in has 30328415Speter dropped to zero. It must update next_out and avail_out when avail_out 30428415Speter has dropped to zero. The application must initialize zalloc, zfree and 30528415Speter opaque before calling the init function. All other fields are set by the 30628415Speter compression library and must not be updated by the application. 30728415Speter 30828415Speter The opaque value provided by the application will be passed as the first 30928415Speter parameter for calls of zalloc and zfree. This can be useful for custom 31028415Speter memory management. The compression library attaches no meaning to the 31128415Speter opaque value. 31228415Speter 31328415Speter zalloc must return Z_NULL if there is not enough memory for the object. 31428415Speter On 16-bit systems, the functions zalloc and zfree must be able to allocate 31528415Speter exactly 65536 bytes, but will not be required to allocate more than this 31628415Speter if the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS, 31728415Speter pointers returned by zalloc for objects of exactly 65536 bytes *must* 31828415Speter have their offset normalized to zero. The default allocation function 31928415Speter provided by this library ensures this (see zutil.c). To reduce memory 32028415Speter requirements and avoid any allocation of 64K objects, at the expense of 32128415Speter compression ratio, compile the library with -DMAX_WBITS=14 (see zconf.h). 32228415Speter 32328415Speter The fields total_in and total_out can be used for statistics or 32428415Speter progress reports. After compression, total_in holds the total size of 32528415Speter the uncompressed data and may be saved for use in the decompressor 32628415Speter (particularly if the decompressor wants to decompress everything in 32728415Speter a single step). 32828415Speter*/ 32928415Speter 33028415Speter /* constants */ 33128415Speter 33228415Speter#define Z_NO_FLUSH 0 33328415Speter#define Z_PARTIAL_FLUSH 1 33434768Speter#define Z_PACKET_FLUSH 2 33534768Speter#define Z_SYNC_FLUSH 3 33634768Speter#define Z_FULL_FLUSH 4 33734768Speter#define Z_FINISH 5 33834768Speter/* Allowed flush values; see deflate() below for details */ 33928415Speter 34028415Speter#define Z_OK 0 34128415Speter#define Z_STREAM_END 1 34234768Speter#define Z_NEED_DICT 2 34328415Speter#define Z_ERRNO (-1) 34428415Speter#define Z_STREAM_ERROR (-2) 34528415Speter#define Z_DATA_ERROR (-3) 34628415Speter#define Z_MEM_ERROR (-4) 34728415Speter#define Z_BUF_ERROR (-5) 34834768Speter#define Z_VERSION_ERROR (-6) 34934768Speter/* Return codes for the compression/decompression functions. Negative 35034768Speter * values are errors, positive values are used for special but normal events. 35134768Speter */ 35228415Speter 35334768Speter#define Z_NO_COMPRESSION 0 35428415Speter#define Z_BEST_SPEED 1 35528415Speter#define Z_BEST_COMPRESSION 9 35628415Speter#define Z_DEFAULT_COMPRESSION (-1) 35728415Speter/* compression levels */ 35828415Speter 35928415Speter#define Z_FILTERED 1 36028415Speter#define Z_HUFFMAN_ONLY 2 36128415Speter#define Z_DEFAULT_STRATEGY 0 36234768Speter/* compression strategy; see deflateInit2() below for details */ 36328415Speter 36428415Speter#define Z_BINARY 0 36528415Speter#define Z_ASCII 1 36628415Speter#define Z_UNKNOWN 2 36734768Speter/* Possible values of the data_type field */ 36828415Speter 36934768Speter#define Z_DEFLATED 8 37034768Speter/* The deflate compression method (the only one supported in this version) */ 37134768Speter 37228415Speter#define Z_NULL 0 /* for initializing zalloc, zfree, opaque */ 37328415Speter 37434768Speter#define zlib_version zlibVersion() 37534768Speter/* for compatibility with versions < 1.0.2 */ 37634768Speter 37734768Speter /* basic functions */ 37834768Speter 37934768Speterextern const char * EXPORT zlibVersion OF((void)); 38034768Speter/* The application can compare zlibVersion and ZLIB_VERSION for consistency. 38128415Speter If the first character differs, the library code actually used is 38228415Speter not compatible with the zlib.h header file used by the application. 38334768Speter This check is automatically made by deflateInit and inflateInit. 38428415Speter */ 38528415Speter 38634768Speter/* 38734768Speterextern int EXPORT deflateInit OF((z_streamp strm, int level)); 38828415Speter 38928415Speter Initializes the internal stream state for compression. The fields 39028415Speter zalloc, zfree and opaque must be initialized before by the caller. 39128415Speter If zalloc and zfree are set to Z_NULL, deflateInit updates them to 39228415Speter use default allocation functions. 39328415Speter 39434768Speter The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9: 39534768Speter 1 gives best speed, 9 gives best compression, 0 gives no compression at 39634768Speter all (the input data is simply copied a block at a time). 39734768Speter Z_DEFAULT_COMPRESSION requests a default compromise between speed and 39834768Speter compression (currently equivalent to level 6). 39928415Speter 40028415Speter deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not 40134768Speter enough memory, Z_STREAM_ERROR if level is not a valid compression level, 40234768Speter Z_VERSION_ERROR if the zlib library version (zlib_version) is incompatible 40334768Speter with the version assumed by the caller (ZLIB_VERSION). 40428415Speter msg is set to null if there is no error message. deflateInit does not 40528415Speter perform any compression: this will be done by deflate(). 40628415Speter*/ 40728415Speter 40828415Speter 40934768Speterextern int EXPORT deflate OF((z_streamp strm, int flush)); 41028415Speter/* 41128415Speter Performs one or both of the following actions: 41228415Speter 41328415Speter - Compress more input starting at next_in and update next_in and avail_in 41428415Speter accordingly. If not all input can be processed (because there is not 41528415Speter enough room in the output buffer), next_in and avail_in are updated and 41628415Speter processing will resume at this point for the next call of deflate(). 41728415Speter 41828415Speter - Provide more output starting at next_out and update next_out and avail_out 41928415Speter accordingly. This action is forced if the parameter flush is non zero. 42028415Speter Forcing flush frequently degrades the compression ratio, so this parameter 42128415Speter should be set only when necessary (in interactive applications). 42228415Speter Some output may be provided even if flush is not set. 42328415Speter 42428415Speter Before the call of deflate(), the application should ensure that at least 42528415Speter one of the actions is possible, by providing more input and/or consuming 42628415Speter more output, and updating avail_in or avail_out accordingly; avail_out 42728415Speter should never be zero before the call. The application can consume the 42828415Speter compressed output when it wants, for example when the output buffer is full 42934768Speter (avail_out == 0), or after each call of deflate(). If deflate returns Z_OK 43034768Speter and with zero avail_out, it must be called again after making room in the 43134768Speter output buffer because there might be more output pending. 43228415Speter 43328415Speter If the parameter flush is set to Z_PARTIAL_FLUSH, the current compression 43428415Speter block is terminated and flushed to the output buffer so that the 43528415Speter decompressor can get all input data available so far. For method 9, a future 43628415Speter variant on method 8, the current block will be flushed but not terminated. 43734768Speter Z_SYNC_FLUSH has the same effect as partial flush except that the compressed 43834768Speter output is byte aligned (the compressor can clear its internal bit buffer) 43934768Speter and the current block is always terminated; this can be useful if the 44034768Speter compressor has to be restarted from scratch after an interruption (in which 44134768Speter case the internal state of the compressor may be lost). 44234768Speter If flush is set to Z_FULL_FLUSH, the compression block is terminated, a 44328415Speter special marker is output and the compression dictionary is discarded; this 44428415Speter is useful to allow the decompressor to synchronize if one compressed block 44528415Speter has been damaged (see inflateSync below). Flushing degrades compression and 44628415Speter so should be used only when necessary. Using Z_FULL_FLUSH too often can 44728415Speter seriously degrade the compression. If deflate returns with avail_out == 0, 44828415Speter this function must be called again with the same value of the flush 44928415Speter parameter and more output space (updated avail_out), until the flush is 45028415Speter complete (deflate returns with non-zero avail_out). 45128415Speter 45228415Speter If the parameter flush is set to Z_PACKET_FLUSH, the compression 45328415Speter block is terminated, and a zero-length stored block is output, 45428415Speter omitting the length bytes (the effect of this is that the 3-bit type 45528415Speter code 000 for a stored block is output, and the output is then 45628415Speter byte-aligned). This is designed for use at the end of a PPP packet. 45728415Speter 45834768Speter If the parameter flush is set to Z_FINISH, pending input is processed, 45934768Speter pending output is flushed and deflate returns with Z_STREAM_END if there 46028415Speter was enough output space; if deflate returns with Z_OK, this function must be 46128415Speter called again with Z_FINISH and more output space (updated avail_out) but no 46228415Speter more input data, until it returns with Z_STREAM_END or an error. After 46328415Speter deflate has returned Z_STREAM_END, the only possible operations on the 46428415Speter stream are deflateReset or deflateEnd. 46528415Speter 46628415Speter Z_FINISH can be used immediately after deflateInit if all the compression 46728415Speter is to be done in a single step. In this case, avail_out must be at least 46828415Speter 0.1% larger than avail_in plus 12 bytes. If deflate does not return 46928415Speter Z_STREAM_END, then it must be called again as described above. 47028415Speter 47128415Speter deflate() may update data_type if it can make a good guess about 47228415Speter the input data type (Z_ASCII or Z_BINARY). In doubt, the data is considered 47328415Speter binary. This field is only for information purposes and does not affect 47428415Speter the compression algorithm in any manner. 47528415Speter 47628415Speter deflate() returns Z_OK if some progress has been made (more input 47728415Speter processed or more output produced), Z_STREAM_END if all input has been 47828415Speter consumed and all output has been produced (only when flush is set to 47928415Speter Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example 48028415Speter if next_in or next_out was NULL), Z_BUF_ERROR if no progress is possible. 48128415Speter*/ 48228415Speter 48328415Speter 48434768Speterextern int EXPORT deflateEnd OF((z_streamp strm)); 48528415Speter/* 48628415Speter All dynamically allocated data structures for this stream are freed. 48728415Speter This function discards any unprocessed input and does not flush any 48828415Speter pending output. 48928415Speter 49028415Speter deflateEnd returns Z_OK if success, Z_STREAM_ERROR if the 49134768Speter stream state was inconsistent, Z_DATA_ERROR if the stream was freed 49234768Speter prematurely (some input or output was discarded). In the error case, 49334768Speter msg may be set but then points to a static string (which must not be 49434768Speter deallocated). 49528415Speter*/ 49628415Speter 49728415Speter 49828415Speter/* 49934768Speterextern int EXPORT inflateInit OF((z_streamp strm)); 50034768Speter 50128415Speter Initializes the internal stream state for decompression. The fields 50234768Speter zalloc, zfree and opaque must be initialized before by the caller. If 50334768Speter zalloc and zfree are set to Z_NULL, inflateInit updates them to use default 50434768Speter allocation functions. 50528415Speter 50628415Speter inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not 50734768Speter enough memory, Z_VERSION_ERROR if the zlib library version is incompatible 50834768Speter with the version assumed by the caller. msg is set to null if there is no 50934768Speter error message. inflateInit does not perform any decompression: this will be 51034768Speter done by inflate(). 51128415Speter*/ 51228415Speter 51355205Speter#if defined(__FreeBSD__) && defined(_KERNEL) 514245102Speter#define inflate _zlib104_inflate /* FreeBSD already has an inflate :-( */ 51528415Speter#endif 51628415Speter 51734768Speterextern int EXPORT inflate OF((z_streamp strm, int flush)); 51828415Speter/* 51928415Speter Performs one or both of the following actions: 52028415Speter 52128415Speter - Decompress more input starting at next_in and update next_in and avail_in 52228415Speter accordingly. If not all input can be processed (because there is not 52328415Speter enough room in the output buffer), next_in is updated and processing 52428415Speter will resume at this point for the next call of inflate(). 52528415Speter 52628415Speter - Provide more output starting at next_out and update next_out and avail_out 52734768Speter accordingly. inflate() provides as much output as possible, until there 52834768Speter is no more input data or no more space in the output buffer (see below 52934768Speter about the flush parameter). 53028415Speter 53128415Speter Before the call of inflate(), the application should ensure that at least 53228415Speter one of the actions is possible, by providing more input and/or consuming 53328415Speter more output, and updating the next_* and avail_* values accordingly. 53428415Speter The application can consume the uncompressed output when it wants, for 53528415Speter example when the output buffer is full (avail_out == 0), or after each 53634768Speter call of inflate(). If inflate returns Z_OK and with zero avail_out, it 53734768Speter must be called again after making room in the output buffer because there 53834768Speter might be more output pending. 53928415Speter 54028415Speter If the parameter flush is set to Z_PARTIAL_FLUSH or Z_PACKET_FLUSH, 54128415Speter inflate flushes as much output as possible to the output buffer. The 54228415Speter flushing behavior of inflate is not specified for values of the flush 54328415Speter parameter other than Z_PARTIAL_FLUSH, Z_PACKET_FLUSH or Z_FINISH, but the 54428415Speter current implementation actually flushes as much output as possible 54528415Speter anyway. For Z_PACKET_FLUSH, inflate checks that once all the input data 54628415Speter has been consumed, it is expecting to see the length field of a stored 54728415Speter block; if not, it returns Z_DATA_ERROR. 54828415Speter 54928415Speter inflate() should normally be called until it returns Z_STREAM_END or an 55028415Speter error. However if all decompression is to be performed in a single step 55128415Speter (a single call of inflate), the parameter flush should be set to 55228415Speter Z_FINISH. In this case all pending input is processed and all pending 55328415Speter output is flushed; avail_out must be large enough to hold all the 55428415Speter uncompressed data. (The size of the uncompressed data may have been saved 55528415Speter by the compressor for this purpose.) The next operation on this stream must 55628415Speter be inflateEnd to deallocate the decompression state. The use of Z_FINISH 55728415Speter is never required, but can be used to inform inflate that a faster routine 55828415Speter may be used for the single inflate() call. 55928415Speter 56028415Speter inflate() returns Z_OK if some progress has been made (more input 56128415Speter processed or more output produced), Z_STREAM_END if the end of the 56228415Speter compressed data has been reached and all uncompressed output has been 56334768Speter produced, Z_NEED_DICT if a preset dictionary is needed at this point (see 56434768Speter inflateSetDictionary below), Z_DATA_ERROR if the input data was corrupted, 56534768Speter Z_STREAM_ERROR if the stream structure was inconsistent (for example if 56634768Speter next_in or next_out was NULL), Z_MEM_ERROR if there was not enough memory, 56734768Speter Z_BUF_ERROR if no progress is possible or if there was not enough room in 56834768Speter the output buffer when Z_FINISH is used. In the Z_DATA_ERROR case, the 56934768Speter application may then call inflateSync to look for a good compression block. 57034768Speter In the Z_NEED_DICT case, strm->adler is set to the Adler32 value of the 57134768Speter dictionary chosen by the compressor. 57234768Speter*/ 57328415Speter 57428415Speter 57534768Speterextern int EXPORT inflateEnd OF((z_streamp strm)); 57628415Speter/* 57728415Speter All dynamically allocated data structures for this stream are freed. 57828415Speter This function discards any unprocessed input and does not flush any 57928415Speter pending output. 58028415Speter 58128415Speter inflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state 58228415Speter was inconsistent. In the error case, msg may be set but then points to a 58328415Speter static string (which must not be deallocated). 58428415Speter*/ 58528415Speter 58634768Speter /* Advanced functions */ 58728415Speter 58828415Speter/* 58928415Speter The following functions are needed only in some special applications. 59028415Speter*/ 59128415Speter 59228415Speter/* 59334768Speterextern int EXPORT deflateInit2 OF((z_streamp strm, 59434768Speter int level, 59534768Speter int method, 59634768Speter int windowBits, 59734768Speter int memLevel, 59834768Speter int strategy)); 59934768Speter 60028415Speter This is another version of deflateInit with more compression options. The 60134768Speter fields next_in, zalloc, zfree and opaque must be initialized before by 60234768Speter the caller. 60328415Speter 60434768Speter The method parameter is the compression method. It must be Z_DEFLATED in 60534768Speter this version of the library. (Method 9 will allow a 64K history buffer and 60628415Speter partial block flushes.) 60728415Speter 60828415Speter The windowBits parameter is the base two logarithm of the window size 60928415Speter (the size of the history buffer). It should be in the range 8..15 for this 61028415Speter version of the library (the value 16 will be allowed for method 9). Larger 61128415Speter values of this parameter result in better compression at the expense of 61228415Speter memory usage. The default value is 15 if deflateInit is used instead. 61328415Speter 61434768Speter The memLevel parameter specifies how much memory should be allocated 61528415Speter for the internal compression state. memLevel=1 uses minimum memory but 61628415Speter is slow and reduces compression ratio; memLevel=9 uses maximum memory 61728415Speter for optimal speed. The default value is 8. See zconf.h for total memory 61828415Speter usage as a function of windowBits and memLevel. 61928415Speter 62034768Speter The strategy parameter is used to tune the compression algorithm. Use the 62134768Speter value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data produced by a 62234768Speter filter (or predictor), or Z_HUFFMAN_ONLY to force Huffman encoding only (no 62334768Speter string match). Filtered data consists mostly of small values with a 62434768Speter somewhat random distribution. In this case, the compression algorithm is 62534768Speter tuned to compress them better. The effect of Z_FILTERED is to force more 62634768Speter Huffman coding and less string matching; it is somewhat intermediate 62734768Speter between Z_DEFAULT and Z_HUFFMAN_ONLY. The strategy parameter only affects 62834768Speter the compression ratio but not the correctness of the compressed output even 62934768Speter if it is not set appropriately. 63028415Speter 63128415Speter If next_in is not null, the library will use this buffer to hold also 63228415Speter some history information; the buffer must either hold the entire input 63328415Speter data, or have at least 1<<(windowBits+1) bytes and be writable. If next_in 63428415Speter is null, the library will allocate its own history buffer (and leave next_in 63528415Speter null). next_out need not be provided here but must be provided by the 63628415Speter application for the next call of deflate(). 63728415Speter 63828415Speter If the history buffer is provided by the application, next_in must 63928415Speter must never be changed by the application since the compressor maintains 64028415Speter information inside this buffer from call to call; the application 64128415Speter must provide more input only by increasing avail_in. next_in is always 64228415Speter reset by the library in this case. 64328415Speter 64428415Speter deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was 64528415Speter not enough memory, Z_STREAM_ERROR if a parameter is invalid (such as 64628415Speter an invalid method). msg is set to null if there is no error message. 64728415Speter deflateInit2 does not perform any compression: this will be done by 64834768Speter deflate(). 64928415Speter*/ 65028415Speter 65134768Speterextern int EXPORT deflateSetDictionary OF((z_streamp strm, 65234768Speter const Bytef *dictionary, 65334768Speter uInt dictLength)); 65428415Speter/* 65534768Speter Initializes the compression dictionary (history buffer) from the given 65634768Speter byte sequence without producing any compressed output. This function must 65734768Speter be called immediately after deflateInit or deflateInit2, before any call 65834768Speter of deflate. The compressor and decompressor must use exactly the same 65934768Speter dictionary (see inflateSetDictionary). 66034768Speter The dictionary should consist of strings (byte sequences) that are likely 66134768Speter to be encountered later in the data to be compressed, with the most commonly 66234768Speter used strings preferably put towards the end of the dictionary. Using a 66334768Speter dictionary is most useful when the data to be compressed is short and 66434768Speter can be predicted with good accuracy; the data can then be compressed better 66534768Speter than with the default empty dictionary. In this version of the library, 66634768Speter only the last 32K bytes of the dictionary are used. 66734768Speter Upon return of this function, strm->adler is set to the Adler32 value 66834768Speter of the dictionary; the decompressor may later use this value to determine 66934768Speter which dictionary has been used by the compressor. (The Adler32 value 67034768Speter applies to the whole dictionary even if only a subset of the dictionary is 67134768Speter actually used by the compressor.) 67234768Speter 67334768Speter deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a 67434768Speter parameter is invalid (such as NULL dictionary) or the stream state 67534768Speter is inconsistent (for example if deflate has already been called for this 67634768Speter stream). deflateSetDictionary does not perform any compression: this will 67734768Speter be done by deflate(). 67834768Speter*/ 67934768Speter 68034768Speterextern int EXPORT deflateCopy OF((z_streamp dest, 68134768Speter z_streamp source)); 68234768Speter/* 68328415Speter Sets the destination stream as a complete copy of the source stream. If 68428415Speter the source stream is using an application-supplied history buffer, a new 68528415Speter buffer is allocated for the destination stream. The compressed output 68628415Speter buffer is always application-supplied. It's the responsibility of the 68728415Speter application to provide the correct values of next_out and avail_out for the 68828415Speter next call of deflate. 68928415Speter 69034768Speter This function can be useful when several compression strategies will be 69128415Speter tried, for example when there are several ways of pre-processing the input 69228415Speter data with a filter. The streams that will be discarded should then be freed 69328415Speter by calling deflateEnd. Note that deflateCopy duplicates the internal 69428415Speter compression state which can be quite large, so this strategy is slow and 69528415Speter can consume lots of memory. 69628415Speter 69734768Speter deflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not 69828415Speter enough memory, Z_STREAM_ERROR if the source stream state was inconsistent 69928415Speter (such as zalloc being NULL). msg is left unchanged in both source and 70028415Speter destination. 70128415Speter*/ 70228415Speter 70334768Speterextern int EXPORT deflateReset OF((z_streamp strm)); 70428415Speter/* 70528415Speter This function is equivalent to deflateEnd followed by deflateInit, 70628415Speter but does not free and reallocate all the internal compression state. 70728415Speter The stream will keep the same compression level and any other attributes 70828415Speter that may have been set by deflateInit2. 70928415Speter 71028415Speter deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source 71128415Speter stream state was inconsistent (such as zalloc or state being NULL). 71228415Speter*/ 71328415Speter 71434768Speterextern int EXPORT deflateParams OF((z_streamp strm, int level, int strategy)); 71534768Speter/* 71634768Speter Dynamically update the compression level and compression strategy. 71734768Speter This can be used to switch between compression and straight copy of 71834768Speter the input data, or to switch to a different kind of input data requiring 71934768Speter a different strategy. If the compression level is changed, the input 72034768Speter available so far is compressed with the old level (and may be flushed); 72134768Speter the new level will take effect only at the next call of deflate(). 72234768Speter 72334768Speter Before the call of deflateParams, the stream state must be set as for 72434768Speter a call of deflate(), since the currently available input may have to 72534768Speter be compressed and flushed. In particular, strm->avail_out must be non-zero. 72634768Speter 72734768Speter deflateParams returns Z_OK if success, Z_STREAM_ERROR if the source 72834768Speter stream state was inconsistent or if a parameter was invalid, Z_BUF_ERROR 72934768Speter if strm->avail_out was zero. 73034768Speter*/ 73134768Speter 73234768Speterextern int EXPORT deflateOutputPending OF((z_streamp strm)); 73334768Speter/* 73434768Speter Returns the number of bytes of output which are immediately 73534768Speter available from the compressor (i.e. without any further input 73634768Speter or flush). 73734768Speter*/ 73834768Speter 73928415Speter/* 74034768Speterextern int EXPORT inflateInit2 OF((z_streamp strm, 74134768Speter int windowBits)); 74234768Speter 74328415Speter This is another version of inflateInit with more compression options. The 74434768Speter fields next_out, zalloc, zfree and opaque must be initialized before by 74534768Speter the caller. 74628415Speter 74728415Speter The windowBits parameter is the base two logarithm of the maximum window 74828415Speter size (the size of the history buffer). It should be in the range 8..15 for 74928415Speter this version of the library (the value 16 will be allowed soon). The 75028415Speter default value is 15 if inflateInit is used instead. If a compressed stream 75128415Speter with a larger window size is given as input, inflate() will return with 75228415Speter the error code Z_DATA_ERROR instead of trying to allocate a larger window. 75328415Speter 75428415Speter If next_out is not null, the library will use this buffer for the history 75528415Speter buffer; the buffer must either be large enough to hold the entire output 75628415Speter data, or have at least 1<<windowBits bytes. If next_out is null, the 75728415Speter library will allocate its own buffer (and leave next_out null). next_in 75828415Speter need not be provided here but must be provided by the application for the 75928415Speter next call of inflate(). 76028415Speter 76128415Speter If the history buffer is provided by the application, next_out must 76228415Speter never be changed by the application since the decompressor maintains 76328415Speter history information inside this buffer from call to call; the application 76428415Speter can only reset next_out to the beginning of the history buffer when 76528415Speter avail_out is zero and all output has been consumed. 76628415Speter 76728415Speter inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was 76828415Speter not enough memory, Z_STREAM_ERROR if a parameter is invalid (such as 76928415Speter windowBits < 8). msg is set to null if there is no error message. 77028415Speter inflateInit2 does not perform any decompression: this will be done by 77128415Speter inflate(). 77228415Speter*/ 77328415Speter 77434768Speterextern int EXPORT inflateSetDictionary OF((z_streamp strm, 77534768Speter const Bytef *dictionary, 77634768Speter uInt dictLength)); 77734768Speter/* 77834768Speter Initializes the decompression dictionary (history buffer) from the given 77934768Speter uncompressed byte sequence. This function must be called immediately after 78034768Speter a call of inflate if this call returned Z_NEED_DICT. The dictionary chosen 78134768Speter by the compressor can be determined from the Adler32 value returned by this 78234768Speter call of inflate. The compressor and decompressor must use exactly the same 78334768Speter dictionary (see deflateSetDictionary). 78434768Speter 78534768Speter inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a 78634768Speter parameter is invalid (such as NULL dictionary) or the stream state is 78734768Speter inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the 78834768Speter expected one (incorrect Adler32 value). inflateSetDictionary does not 78934768Speter perform any decompression: this will be done by subsequent calls of 79034768Speter inflate(). 79134768Speter*/ 79234768Speter 79334768Speterextern int EXPORT inflateSync OF((z_streamp strm)); 79428415Speter/* 79528415Speter Skips invalid compressed data until the special marker (see deflate() 79628415Speter above) can be found, or until all available input is skipped. No output 79728415Speter is provided. 79828415Speter 79928415Speter inflateSync returns Z_OK if the special marker has been found, Z_BUF_ERROR 80028415Speter if no more input was provided, Z_DATA_ERROR if no marker has been found, 80128415Speter or Z_STREAM_ERROR if the stream structure was inconsistent. In the success 80228415Speter case, the application may save the current current value of total_in which 80328415Speter indicates where valid compressed data was found. In the error case, the 80428415Speter application may repeatedly call inflateSync, providing more input each time, 80528415Speter until success or end of the input data. 80628415Speter*/ 80728415Speter 80834768Speterextern int EXPORT inflateReset OF((z_streamp strm)); 80928415Speter/* 81028415Speter This function is equivalent to inflateEnd followed by inflateInit, 81128415Speter but does not free and reallocate all the internal decompression state. 81228415Speter The stream will keep attributes that may have been set by inflateInit2. 81328415Speter 81428415Speter inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source 81528415Speter stream state was inconsistent (such as zalloc or state being NULL). 81628415Speter*/ 81728415Speter 81828415Speterextern int inflateIncomp OF((z_stream *strm)); 81928415Speter/* 82028415Speter This function adds the data at next_in (avail_in bytes) to the output 82128415Speter history without performing any output. There must be no pending output, 82228415Speter and the decompressor must be expecting to see the start of a block. 82328415Speter Calling this function is equivalent to decompressing a stored block 82428415Speter containing the data at next_in (except that the data is not output). 82528415Speter*/ 82628415Speter 82734768Speter /* utility functions */ 82834768Speter 82934768Speter/* 83034768Speter The following utility functions are implemented on top of the 83134768Speter basic stream-oriented functions. To simplify the interface, some 83234768Speter default options are assumed (compression level, window size, 83334768Speter standard memory allocation functions). The source code of these 83434768Speter utility functions can easily be modified if you need special options. 83534768Speter*/ 83634768Speter 83734768Speterextern int EXPORT compress OF((Bytef *dest, uLongf *destLen, 83834768Speter const Bytef *source, uLong sourceLen)); 83934768Speter/* 84034768Speter Compresses the source buffer into the destination buffer. sourceLen is 84134768Speter the byte length of the source buffer. Upon entry, destLen is the total 84234768Speter size of the destination buffer, which must be at least 0.1% larger than 84334768Speter sourceLen plus 12 bytes. Upon exit, destLen is the actual size of the 84434768Speter compressed buffer. 84534768Speter This function can be used to compress a whole file at once if the 84634768Speter input file is mmap'ed. 84734768Speter compress returns Z_OK if success, Z_MEM_ERROR if there was not 84834768Speter enough memory, Z_BUF_ERROR if there was not enough room in the output 84934768Speter buffer. 85034768Speter*/ 85134768Speter 85234768Speterextern int EXPORT uncompress OF((Bytef *dest, uLongf *destLen, 85334768Speter const Bytef *source, uLong sourceLen)); 85434768Speter/* 85534768Speter Decompresses the source buffer into the destination buffer. sourceLen is 85634768Speter the byte length of the source buffer. Upon entry, destLen is the total 85734768Speter size of the destination buffer, which must be large enough to hold the 85834768Speter entire uncompressed data. (The size of the uncompressed data must have 85934768Speter been saved previously by the compressor and transmitted to the decompressor 86034768Speter by some mechanism outside the scope of this compression library.) 86134768Speter Upon exit, destLen is the actual size of the compressed buffer. 86234768Speter This function can be used to decompress a whole file at once if the 86334768Speter input file is mmap'ed. 86434768Speter 86534768Speter uncompress returns Z_OK if success, Z_MEM_ERROR if there was not 86634768Speter enough memory, Z_BUF_ERROR if there was not enough room in the output 86734768Speter buffer, or Z_DATA_ERROR if the input data was corrupted. 86834768Speter*/ 86934768Speter 87034768Speter 87134768Spetertypedef voidp gzFile; 87234768Speter 87334768Speterextern gzFile EXPORT gzopen OF((const char *path, const char *mode)); 87434768Speter/* 87534768Speter Opens a gzip (.gz) file for reading or writing. The mode parameter 87634768Speter is as in fopen ("rb" or "wb") but can also include a compression level 87734768Speter ("wb9"). gzopen can be used to read a file which is not in gzip format; 87834768Speter in this case gzread will directly read from the file without decompression. 87934768Speter gzopen returns NULL if the file could not be opened or if there was 88034768Speter insufficient memory to allocate the (de)compression state; errno 88134768Speter can be checked to distinguish the two cases (if errno is zero, the 88234768Speter zlib error is Z_MEM_ERROR). 88334768Speter*/ 88434768Speter 88534768Speterextern gzFile EXPORT gzdopen OF((int fd, const char *mode)); 88634768Speter/* 88734768Speter gzdopen() associates a gzFile with the file descriptor fd. File 88834768Speter descriptors are obtained from calls like open, dup, creat, pipe or 88934768Speter fileno (in the file has been previously opened with fopen). 89034768Speter The mode parameter is as in gzopen. 89134768Speter The next call of gzclose on the returned gzFile will also close the 89234768Speter file descriptor fd, just like fclose(fdopen(fd), mode) closes the file 89334768Speter descriptor fd. If you want to keep fd open, use gzdopen(dup(fd), mode). 89434768Speter gzdopen returns NULL if there was insufficient memory to allocate 89534768Speter the (de)compression state. 89634768Speter*/ 89734768Speter 89834768Speterextern int EXPORT gzread OF((gzFile file, voidp buf, unsigned len)); 89934768Speter/* 90034768Speter Reads the given number of uncompressed bytes from the compressed file. 90134768Speter If the input file was not in gzip format, gzread copies the given number 90234768Speter of bytes into the buffer. 90334768Speter gzread returns the number of uncompressed bytes actually read (0 for 90434768Speter end of file, -1 for error). */ 90534768Speter 90634768Speterextern int EXPORT gzwrite OF((gzFile file, const voidp buf, unsigned len)); 90734768Speter/* 90834768Speter Writes the given number of uncompressed bytes into the compressed file. 90934768Speter gzwrite returns the number of uncompressed bytes actually written 91034768Speter (0 in case of error). 91134768Speter*/ 91234768Speter 91334768Speterextern int EXPORT gzflush OF((gzFile file, int flush)); 91434768Speter/* 91534768Speter Flushes all pending output into the compressed file. The parameter 91634768Speter flush is as in the deflate() function. The return value is the zlib 91734768Speter error number (see function gzerror below). gzflush returns Z_OK if 91834768Speter the flush parameter is Z_FINISH and all output could be flushed. 91934768Speter gzflush should be called only when strictly necessary because it can 92034768Speter degrade compression. 92134768Speter*/ 92234768Speter 92334768Speterextern int EXPORT gzclose OF((gzFile file)); 92434768Speter/* 92534768Speter Flushes all pending output if necessary, closes the compressed file 92634768Speter and deallocates all the (de)compression state. The return value is the zlib 92734768Speter error number (see function gzerror below). 92834768Speter*/ 92934768Speter 93034768Speterextern const char * EXPORT gzerror OF((gzFile file, int *errnum)); 93134768Speter/* 93234768Speter Returns the error message for the last error which occurred on the 93334768Speter given compressed file. errnum is set to zlib error number. If an 93496755Strhodes error occurred in the filesystem and not in the compression library, 93534768Speter errnum is set to Z_ERRNO and the application may consult errno 93634768Speter to get the exact error code. 93734768Speter*/ 93834768Speter 93928415Speter /* checksum functions */ 94028415Speter 94128415Speter/* 94234768Speter These functions are not related to compression but are exported 94334768Speter anyway because they might be useful in applications using the 94428415Speter compression library. 94528415Speter*/ 94628415Speter 94734768Speterextern uLong EXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len)); 94828415Speter 94928415Speter/* 95028415Speter Update a running Adler-32 checksum with the bytes buf[0..len-1] and 95128415Speter return the updated checksum. If buf is NULL, this function returns 95228415Speter the required initial value for the checksum. 95328415Speter An Adler-32 checksum is almost as reliable as a CRC32 but can be computed 95428415Speter much faster. Usage example: 95528415Speter 95628415Speter uLong adler = adler32(0L, Z_NULL, 0); 95728415Speter 95828415Speter while (read_buffer(buffer, length) != EOF) { 95928415Speter adler = adler32(adler, buffer, length); 96028415Speter } 96128415Speter if (adler != original_adler) error(); 96228415Speter*/ 96328415Speter 96497512Sphk#if 0 96534768Speterextern uLong EXPORT crc32 OF((uLong crc, const Bytef *buf, uInt len)); 96634768Speter/* 96734768Speter Update a running crc with the bytes buf[0..len-1] and return the updated 96834768Speter crc. If buf is NULL, this function returns the required initial value 96934768Speter for the crc. Pre- and post-conditioning (one's complement) is performed 97034768Speter within this function so it shouldn't be done by the application. 97134768Speter Usage example: 97234768Speter 97334768Speter uLong crc = crc32(0L, Z_NULL, 0); 97434768Speter 97534768Speter while (read_buffer(buffer, length) != EOF) { 97634768Speter crc = crc32(crc, buffer, length); 97734768Speter } 97834768Speter if (crc != original_crc) error(); 97934768Speter*/ 98097512Sphk#endif 98134768Speter 98234768Speter 98334768Speter /* various hacks, don't look :) */ 98434768Speter 98534768Speter/* deflateInit and inflateInit are macros to allow checking the zlib version 98634768Speter * and the compiler's view of z_stream: 98734768Speter */ 98834768Speterextern int EXPORT deflateInit_ OF((z_streamp strm, int level, 98934768Speter const char *version, int stream_size)); 99034768Speterextern int EXPORT inflateInit_ OF((z_streamp strm, 99134768Speter const char *version, int stream_size)); 99234768Speterextern int EXPORT deflateInit2_ OF((z_streamp strm, int level, int method, 99334768Speter int windowBits, int memLevel, int strategy, 99434768Speter const char *version, int stream_size)); 99534768Speterextern int EXPORT inflateInit2_ OF((z_streamp strm, int windowBits, 99634768Speter const char *version, int stream_size)); 99734768Speter#define deflateInit(strm, level) \ 99834768Speter deflateInit_((strm), (level), ZLIB_VERSION, sizeof(z_stream)) 99934768Speter#define inflateInit(strm) \ 100034768Speter inflateInit_((strm), ZLIB_VERSION, sizeof(z_stream)) 100134768Speter#define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \ 100234768Speter deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\ 100334768Speter (strategy), ZLIB_VERSION, sizeof(z_stream)) 100434768Speter#define inflateInit2(strm, windowBits) \ 100534768Speter inflateInit2_((strm), (windowBits), ZLIB_VERSION, sizeof(z_stream)) 100634768Speter 100734768Speter#if !defined(_Z_UTIL_H) && !defined(NO_DUMMY_DECL) 100828415Speter struct internal_state {int dummy;}; /* hack for buggy compilers */ 100928415Speter#endif 101028415Speter 101134768SpeteruLongf *get_crc_table OF((void)); /* can be used by asm versions of crc32() */ 101234768Speter 1013204552Salfred#ifdef _KERNEL 1014204552Salfredstruct vnode; 1015204552Salfredextern gzFile gz_open OF((const char *path, const char *mode, 1016204552Salfred struct vnode *vp)); 1017204552Salfred#endif 1018204552Salfred 1019204552Salfred 102034768Speter#ifdef __cplusplus 102134768Speter} 102234768Speter#endif 102334768Speter 102428415Speter#endif /* _ZLIB_H */ 102534768Speter/* --- zlib.h */ 1026