#ifndef ZUTIL_H_ #define ZUTIL_H_ /* zutil.h -- internal interface and configuration of the compression library * Copyright (C) 1995-2024 Jean-loup Gailly, Mark Adler * For conditions of distribution and use, see copyright notice in zlib.h */ /* WARNING: this file should *not* be used by applications. It is part of the implementation of the compression library and is subject to change. Applications should only use zlib.h. */ #include "zbuild.h" #ifdef ZLIB_COMPAT # include "zlib.h" #else # include "zlib-ng.h" #endif typedef unsigned char uch; /* Included for compatibility with external code only */ typedef uint16_t ush; /* Included for compatibility with external code only */ typedef unsigned long ulg; extern z_const char * const PREFIX(z_errmsg)[10]; /* indexed by 2-zlib_error */ /* (size given to avoid silly warnings with Visual C++) */ #define ERR_MSG(err) PREFIX(z_errmsg)[(err) < -6 || (err) > 2 ? 9 : 2 - (err)] #define ERR_RETURN(strm, err) return (strm->msg = ERR_MSG(err), (err)) /* To be used only when the state is known to be valid */ /* common constants */ #ifndef DEF_WBITS # define DEF_WBITS MAX_WBITS #endif /* default windowBits for decompression. MAX_WBITS is for compression only */ #define MAX_BITS 15 /* all codes must not exceed MAX_BITS bits */ #define MAX_DIST_EXTRA_BITS 13 /* maximum number of extra distance bits */ #if MAX_MEM_LEVEL >= 8 # define DEF_MEM_LEVEL 8 #else # define DEF_MEM_LEVEL MAX_MEM_LEVEL #endif /* default memLevel */ #define STORED_BLOCK 0 #define STATIC_TREES 1 #define DYN_TREES 2 /* The three kinds of block type */ #define STD_MIN_MATCH 3 #define STD_MAX_MATCH 258 /* The minimum and maximum match lengths mandated by the deflate standard */ #define WANT_MIN_MATCH 4 /* The minimum wanted match length, affects deflate_quick, deflate_fast, deflate_medium and deflate_slow */ #define PRESET_DICT 0x20 /* preset dictionary flag in zlib header */ #define ADLER32_INITIAL_VALUE 1 /* initial adler-32 hash value */ #define CRC32_INITIAL_VALUE 0 /* initial crc-32 hash value */ #define ZLIB_WRAPLEN 6 /* zlib format overhead */ #define GZIP_WRAPLEN 18 /* gzip format overhead */ #define DEFLATE_HEADER_BITS 3 #define DEFLATE_EOBS_BITS 15 #define DEFLATE_PAD_BITS 6 #define DEFLATE_BLOCK_OVERHEAD ((DEFLATE_HEADER_BITS + DEFLATE_EOBS_BITS + DEFLATE_PAD_BITS) >> 3) /* deflate block overhead: 3 bits for block start + 15 bits for block end + padding to nearest byte */ #define DEFLATE_QUICK_LIT_MAX_BITS 9 #define DEFLATE_QUICK_OVERHEAD(x) ((x * (DEFLATE_QUICK_LIT_MAX_BITS - 8) + 7) >> 3) /* deflate_quick worst-case overhead: 9 bits per literal, round up to next byte (+7) */ /* target dependencies */ #ifdef AMIGA # define OS_CODE 1 #endif #ifdef __370__ # if __TARGET_LIB__ < 0x20000000 # define OS_CODE 4 # elif __TARGET_LIB__ < 0x40000000 # define OS_CODE 11 # else # define OS_CODE 8 # endif #endif #if defined(ATARI) || defined(atarist) # define OS_CODE 5 #endif #ifdef OS2 # define OS_CODE 6 #endif #if defined(MACOS) # define OS_CODE 7 #endif #ifdef __acorn # define OS_CODE 13 #endif #if defined(_WIN32) && !defined(__CYGWIN__) # define OS_CODE 10 #endif #ifdef __APPLE__ # define OS_CODE 19 #endif /* common defaults */ #ifndef OS_CODE # define OS_CODE 3 /* assume Unix */ #endif /* macros */ #define CHECK_VER_STSIZE(_ver,_stsize) ((_ver) == NULL || (_ver)[0] != PREFIX2(VERSION)[0] || (_stsize) != (int32_t)sizeof(PREFIX3(stream))) /* memory allocation functions */ void Z_INTERNAL *PREFIX(zcalloc)(void *opaque, unsigned items, unsigned size); void Z_INTERNAL PREFIX(zcfree)(void *opaque, void *ptr); typedef void *zng_calloc_func(void *opaque, unsigned items, unsigned size); typedef void zng_cfree_func(void *opaque, void *ptr); #endif /* ZUTIL_H_ */