1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
433 lines
17 KiB
C
433 lines
17 KiB
C
/* */
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/*
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* This file is derived from zlib.h and zconf.h from the zlib-0.95
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* distribution by Jean-loup Gailly and Mark Adler, with some additions
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* by Paul Mackerras to aid in implementing Deflate compression and
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* decompression for PPP packets.
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*/
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/*
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* ==FILEVERSION 960122==
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*
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* This marker is used by the Linux installation script to determine
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* whether an up-to-date version of this file is already installed.
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*/
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/* zlib.h -- interface of the 'zlib' general purpose compression library
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version 0.95, Aug 16th, 1995.
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Copyright (C) 1995 Jean-loup Gailly and Mark Adler
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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Jean-loup Gailly Mark Adler
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gzip@prep.ai.mit.edu madler@alumni.caltech.edu
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*/
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#ifndef _ZLIB_H
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#define _ZLIB_H
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/* #include "zconf.h" */ /* included directly here */
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/* zconf.h -- configuration of the zlib compression library
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* Copyright (C) 1995 Jean-loup Gailly.
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* For conditions of distribution and use, see copyright notice in zlib.h
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*/
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/* From: zconf.h,v 1.12 1995/05/03 17:27:12 jloup Exp */
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/*
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The library does not install any signal handler. It is recommended to
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add at least a handler for SIGSEGV when decompressing; the library checks
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the consistency of the input data whenever possible but may go nuts
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for some forms of corrupted input.
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*/
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/*
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* Compile with -DMAXSEG_64K if the alloc function cannot allocate more
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* than 64k bytes at a time (needed on systems with 16-bit int).
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* Compile with -DUNALIGNED_OK if it is OK to access shorts or ints
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* at addresses which are not a multiple of their size.
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* Under DOS, -DFAR=far or -DFAR=__far may be needed.
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*/
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#ifndef STDC
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# if defined(MSDOS) || defined(__STDC__) || defined(__cplusplus)
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# define STDC
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# endif
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#endif
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#ifdef __MWERKS__ /* Metrowerks CodeWarrior declares fileno() in unix.h */
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# include <unix.h>
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#endif
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/* Maximum value for memLevel in deflateInit2 */
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#ifndef MAX_MEM_LEVEL
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# ifdef MAXSEG_64K
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# define MAX_MEM_LEVEL 8
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# else
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# define MAX_MEM_LEVEL 9
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# endif
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#endif
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#ifndef FAR
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# define FAR
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#endif
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/* Maximum value for windowBits in deflateInit2 and inflateInit2 */
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#ifndef MAX_WBITS
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# define MAX_WBITS 15 /* 32K LZ77 window */
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#endif
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/* The memory requirements for deflate are (in bytes):
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1 << (windowBits+2) + 1 << (memLevel+9)
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that is: 128K for windowBits=15 + 128K for memLevel = 8 (default values)
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plus a few kilobytes for small objects. For example, if you want to reduce
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the default memory requirements from 256K to 128K, compile with
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make CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7"
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Of course this will generally degrade compression (there's no free lunch).
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The memory requirements for inflate are (in bytes) 1 << windowBits
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that is, 32K for windowBits=15 (default value) plus a few kilobytes
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for small objects.
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*/
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/* Type declarations */
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#ifndef OF /* function prototypes */
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# ifdef STDC
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# define OF(args) args
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# else
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# define OF(args) ()
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# endif
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#endif
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typedef unsigned char Byte; /* 8 bits */
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typedef unsigned int uInt; /* 16 bits or more */
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typedef unsigned long uLong; /* 32 bits or more */
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typedef Byte FAR Bytef;
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typedef char FAR charf;
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typedef int FAR intf;
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typedef uInt FAR uIntf;
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typedef uLong FAR uLongf;
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#ifdef STDC
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typedef void FAR *voidpf;
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typedef void *voidp;
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#else
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typedef Byte FAR *voidpf;
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typedef Byte *voidp;
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#endif
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/* end of original zconf.h */
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#define ZLIB_VERSION "0.95P"
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/*
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The 'zlib' compression library provides in-memory compression and
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decompression functions, including integrity checks of the uncompressed
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data. This version of the library supports only one compression method
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(deflation) but other algorithms may be added later and will have the same
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stream interface.
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For compression the application must provide the output buffer and
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may optionally provide the input buffer for optimization. For decompression,
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the application must provide the input buffer and may optionally provide
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the output buffer for optimization.
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Compression can be done in a single step if the buffers are large
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enough (for example if an input file is mmap'ed), or can be done by
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repeated calls of the compression function. In the latter case, the
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application must provide more input and/or consume the output
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(providing more output space) before each call.
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*/
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typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size));
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typedef void (*free_func) OF((voidpf opaque, voidpf address, uInt nbytes));
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struct internal_state;
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typedef struct z_stream_s {
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Bytef *next_in; /* next input byte */
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uInt avail_in; /* number of bytes available at next_in */
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uLong total_in; /* total nb of input bytes read so far */
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Bytef *next_out; /* next output byte should be put there */
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uInt avail_out; /* remaining free space at next_out */
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uLong total_out; /* total nb of bytes output so far */
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char *msg; /* last error message, NULL if no error */
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struct internal_state FAR *state; /* not visible by applications */
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alloc_func zalloc; /* used to allocate the internal state */
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free_func zfree; /* used to free the internal state */
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voidp opaque; /* private data object passed to zalloc and zfree */
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Byte data_type; /* best guess about the data type: ascii or binary */
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} z_stream;
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/*
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The application must update next_in and avail_in when avail_in has
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dropped to zero. It must update next_out and avail_out when avail_out
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has dropped to zero. The application must initialize zalloc, zfree and
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opaque before calling the init function. All other fields are set by the
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compression library and must not be updated by the application.
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The opaque value provided by the application will be passed as the first
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parameter for calls of zalloc and zfree. This can be useful for custom
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memory management. The compression library attaches no meaning to the
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opaque value.
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zalloc must return Z_NULL if there is not enough memory for the object.
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On 16-bit systems, the functions zalloc and zfree must be able to allocate
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exactly 65536 bytes, but will not be required to allocate more than this
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if the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS,
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pointers returned by zalloc for objects of exactly 65536 bytes *must*
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have their offset normalized to zero. The default allocation function
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provided by this library ensures this (see zutil.c). To reduce memory
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requirements and avoid any allocation of 64K objects, at the expense of
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compression ratio, compile the library with -DMAX_WBITS=14 (see zconf.h).
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The fields total_in and total_out can be used for statistics or
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progress reports. After compression, total_in holds the total size of
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the uncompressed data and may be saved for use in the decompressor
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(particularly if the decompressor wants to decompress everything in
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a single step).
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*/
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/* constants */
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#define Z_NO_FLUSH 0
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#define Z_PARTIAL_FLUSH 1
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#define Z_FULL_FLUSH 2
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#define Z_SYNC_FLUSH 3 /* experimental: partial_flush + byte align */
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#define Z_FINISH 4
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#define Z_PACKET_FLUSH 5
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/* See deflate() below for the usage of these constants */
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#define Z_OK 0
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#define Z_STREAM_END 1
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#define Z_ERRNO (-1)
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#define Z_STREAM_ERROR (-2)
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#define Z_DATA_ERROR (-3)
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#define Z_MEM_ERROR (-4)
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#define Z_BUF_ERROR (-5)
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/* error codes for the compression/decompression functions */
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#define Z_BEST_SPEED 1
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#define Z_BEST_COMPRESSION 9
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#define Z_DEFAULT_COMPRESSION (-1)
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/* compression levels */
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#define Z_FILTERED 1
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#define Z_HUFFMAN_ONLY 2
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#define Z_DEFAULT_STRATEGY 0
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#define Z_BINARY 0
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#define Z_ASCII 1
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#define Z_UNKNOWN 2
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/* Used to set the data_type field */
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#define Z_NULL 0 /* for initializing zalloc, zfree, opaque */
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extern char *zlib_version;
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/* The application can compare zlib_version and ZLIB_VERSION for consistency.
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If the first character differs, the library code actually used is
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not compatible with the zlib.h header file used by the application.
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*/
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/* basic functions */
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extern int inflateInit OF((z_stream *strm));
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/*
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Initializes the internal stream state for decompression. The fields
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zalloc and zfree must be initialized before by the caller. If zalloc and
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zfree are set to Z_NULL, inflateInit updates them to use default allocation
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functions.
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inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not
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enough memory. msg is set to null if there is no error message.
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inflateInit does not perform any decompression: this will be done by
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inflate().
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*/
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extern int inflate OF((z_stream *strm, int flush));
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/*
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Performs one or both of the following actions:
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- Decompress more input starting at next_in and update next_in and avail_in
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accordingly. If not all input can be processed (because there is not
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enough room in the output buffer), next_in is updated and processing
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will resume at this point for the next call of inflate().
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- Provide more output starting at next_out and update next_out and avail_out
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accordingly. inflate() always provides as much output as possible
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(until there is no more input data or no more space in the output buffer).
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Before the call of inflate(), the application should ensure that at least
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one of the actions is possible, by providing more input and/or consuming
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more output, and updating the next_* and avail_* values accordingly.
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The application can consume the uncompressed output when it wants, for
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example when the output buffer is full (avail_out == 0), or after each
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call of inflate().
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If the parameter flush is set to Z_PARTIAL_FLUSH or Z_PACKET_FLUSH,
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inflate flushes as much output as possible to the output buffer. The
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flushing behavior of inflate is not specified for values of the flush
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parameter other than Z_PARTIAL_FLUSH, Z_PACKET_FLUSH or Z_FINISH, but the
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current implementation actually flushes as much output as possible
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anyway. For Z_PACKET_FLUSH, inflate checks that once all the input data
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has been consumed, it is expecting to see the length field of a stored
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block; if not, it returns Z_DATA_ERROR.
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inflate() should normally be called until it returns Z_STREAM_END or an
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error. However if all decompression is to be performed in a single step
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(a single call of inflate), the parameter flush should be set to
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Z_FINISH. In this case all pending input is processed and all pending
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output is flushed; avail_out must be large enough to hold all the
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uncompressed data. (The size of the uncompressed data may have been saved
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by the compressor for this purpose.) The next operation on this stream must
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be inflateEnd to deallocate the decompression state. The use of Z_FINISH
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is never required, but can be used to inform inflate that a faster routine
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may be used for the single inflate() call.
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inflate() returns Z_OK if some progress has been made (more input
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processed or more output produced), Z_STREAM_END if the end of the
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compressed data has been reached and all uncompressed output has been
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produced, Z_DATA_ERROR if the input data was corrupted, Z_STREAM_ERROR if
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the stream structure was inconsistent (for example if next_in or next_out
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was NULL), Z_MEM_ERROR if there was not enough memory, Z_BUF_ERROR if no
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progress is possible or if there was not enough room in the output buffer
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when Z_FINISH is used. In the Z_DATA_ERROR case, the application may then
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call inflateSync to look for a good compression block. */
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extern int inflateEnd OF((z_stream *strm));
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/*
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All dynamically allocated data structures for this stream are freed.
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This function discards any unprocessed input and does not flush any
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pending output.
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inflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state
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was inconsistent. In the error case, msg may be set but then points to a
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static string (which must not be deallocated).
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*/
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/* advanced functions */
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extern int inflateInit2 OF((z_stream *strm,
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int windowBits));
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/*
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This is another version of inflateInit with more compression options. The
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fields next_out, zalloc and zfree must be initialized before by the caller.
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The windowBits parameter is the base two logarithm of the maximum window
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size (the size of the history buffer). It should be in the range 8..15 for
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this version of the library (the value 16 will be allowed soon). The
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default value is 15 if inflateInit is used instead. If a compressed stream
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with a larger window size is given as input, inflate() will return with
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the error code Z_DATA_ERROR instead of trying to allocate a larger window.
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If next_out is not null, the library will use this buffer for the history
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buffer; the buffer must either be large enough to hold the entire output
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data, or have at least 1<<windowBits bytes. If next_out is null, the
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library will allocate its own buffer (and leave next_out null). next_in
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need not be provided here but must be provided by the application for the
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next call of inflate().
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If the history buffer is provided by the application, next_out must
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never be changed by the application since the decompressor maintains
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history information inside this buffer from call to call; the application
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can only reset next_out to the beginning of the history buffer when
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avail_out is zero and all output has been consumed.
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inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was
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not enough memory, Z_STREAM_ERROR if a parameter is invalid (such as
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windowBits < 8). msg is set to null if there is no error message.
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inflateInit2 does not perform any decompression: this will be done by
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inflate().
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*/
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extern int inflateSync OF((z_stream *strm));
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/*
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Skips invalid compressed data until the special marker (see deflate()
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above) can be found, or until all available input is skipped. No output
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is provided.
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inflateSync returns Z_OK if the special marker has been found, Z_BUF_ERROR
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if no more input was provided, Z_DATA_ERROR if no marker has been found,
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or Z_STREAM_ERROR if the stream structure was inconsistent. In the success
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case, the application may save the current current value of total_in which
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indicates where valid compressed data was found. In the error case, the
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application may repeatedly call inflateSync, providing more input each time,
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until success or end of the input data.
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*/
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extern int inflateReset OF((z_stream *strm));
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/*
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This function is equivalent to inflateEnd followed by inflateInit,
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but does not free and reallocate all the internal decompression state.
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The stream will keep attributes that may have been set by inflateInit2.
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inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
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stream state was inconsistent (such as zalloc or state being NULL).
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*/
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extern int inflateIncomp OF((z_stream *strm));
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/*
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This function adds the data at next_in (avail_in bytes) to the output
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history without performing any output. There must be no pending output,
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and the decompressor must be expecting to see the start of a block.
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Calling this function is equivalent to decompressing a stored block
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containing the data at next_in (except that the data is not output).
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*/
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/* checksum functions */
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/*
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This function is not related to compression but is exported
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anyway because it might be useful in applications using the
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compression library.
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*/
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extern uLong adler32 OF((uLong adler, Bytef *buf, uInt len));
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/*
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Update a running Adler-32 checksum with the bytes buf[0..len-1] and
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return the updated checksum. If buf is NULL, this function returns
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the required initial value for the checksum.
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An Adler-32 checksum is almost as reliable as a CRC32 but can be computed
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much faster. Usage example:
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uLong adler = adler32(0L, Z_NULL, 0);
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while (read_buffer(buffer, length) != EOF) {
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adler = adler32(adler, buffer, length);
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}
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if (adler != original_adler) error();
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*/
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#ifndef _Z_UTIL_H
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struct internal_state {int dummy;}; /* hack for buggy compilers */
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#endif
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#endif /* _ZLIB_H */
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