digest 0.0.0.4 → 0.0.0.5
raw patch · 4 files changed
+2/−1933 lines, 4 filesdep +zlibPVP ok
version bump matches the API change (PVP)
Dependencies added: zlib
API changes (from Hackage documentation)
Files
- cbits/adler32.c +0/−149
- cbits/crc32.c +0/−423
- cbits/zlib.h +0/−1357
- digest.cabal +2/−4
− cbits/adler32.c
@@ -1,149 +0,0 @@-/* adler32.c -- compute the Adler-32 checksum of a data stream- * Copyright (C) 1995-2004 Mark Adler- * For conditions of distribution and use, see copyright notice in zlib.h- */--/* @(#) $Id$ */--#define ZLIB_INTERNAL-#include "zlib.h"--#define BASE 65521UL /* largest prime smaller than 65536 */-#define NMAX 5552-/* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */--#define DO1(buf,i) {adler += (buf)[i]; sum2 += adler;}-#define DO2(buf,i) DO1(buf,i); DO1(buf,i+1);-#define DO4(buf,i) DO2(buf,i); DO2(buf,i+2);-#define DO8(buf,i) DO4(buf,i); DO4(buf,i+4);-#define DO16(buf) DO8(buf,0); DO8(buf,8);--/* use NO_DIVIDE if your processor does not do division in hardware */-#ifdef NO_DIVIDE-# define MOD(a) \- do { \- if (a >= (BASE << 16)) a -= (BASE << 16); \- if (a >= (BASE << 15)) a -= (BASE << 15); \- if (a >= (BASE << 14)) a -= (BASE << 14); \- if (a >= (BASE << 13)) a -= (BASE << 13); \- if (a >= (BASE << 12)) a -= (BASE << 12); \- if (a >= (BASE << 11)) a -= (BASE << 11); \- if (a >= (BASE << 10)) a -= (BASE << 10); \- if (a >= (BASE << 9)) a -= (BASE << 9); \- if (a >= (BASE << 8)) a -= (BASE << 8); \- if (a >= (BASE << 7)) a -= (BASE << 7); \- if (a >= (BASE << 6)) a -= (BASE << 6); \- if (a >= (BASE << 5)) a -= (BASE << 5); \- if (a >= (BASE << 4)) a -= (BASE << 4); \- if (a >= (BASE << 3)) a -= (BASE << 3); \- if (a >= (BASE << 2)) a -= (BASE << 2); \- if (a >= (BASE << 1)) a -= (BASE << 1); \- if (a >= BASE) a -= BASE; \- } while (0)-# define MOD4(a) \- do { \- if (a >= (BASE << 4)) a -= (BASE << 4); \- if (a >= (BASE << 3)) a -= (BASE << 3); \- if (a >= (BASE << 2)) a -= (BASE << 2); \- if (a >= (BASE << 1)) a -= (BASE << 1); \- if (a >= BASE) a -= BASE; \- } while (0)-#else-# define MOD(a) a %= BASE-# define MOD4(a) a %= BASE-#endif--/* ========================================================================= */-uLong ZEXPORT adler32(adler, buf, len)- uLong adler;- const Bytef *buf;- uInt len;-{- unsigned long sum2;- unsigned n;-- /* split Adler-32 into component sums */- sum2 = (adler >> 16) & 0xffff;- adler &= 0xffff;-- /* in case user likes doing a byte at a time, keep it fast */- if (len == 1) {- adler += buf[0];- if (adler >= BASE)- adler -= BASE;- sum2 += adler;- if (sum2 >= BASE)- sum2 -= BASE;- return adler | (sum2 << 16);- }-- /* initial Adler-32 value (deferred check for len == 1 speed) */- if (buf == Z_NULL)- return 1L;-- /* in case short lengths are provided, keep it somewhat fast */- if (len < 16) {- while (len--) {- adler += *buf++;- sum2 += adler;- }- if (adler >= BASE)- adler -= BASE;- MOD4(sum2); /* only added so many BASE's */- return adler | (sum2 << 16);- }-- /* do length NMAX blocks -- requires just one modulo operation */- while (len >= NMAX) {- len -= NMAX;- n = NMAX / 16; /* NMAX is divisible by 16 */- do {- DO16(buf); /* 16 sums unrolled */- buf += 16;- } while (--n);- MOD(adler);- MOD(sum2);- }-- /* do remaining bytes (less than NMAX, still just one modulo) */- if (len) { /* avoid modulos if none remaining */- while (len >= 16) {- len -= 16;- DO16(buf);- buf += 16;- }- while (len--) {- adler += *buf++;- sum2 += adler;- }- MOD(adler);- MOD(sum2);- }-- /* return recombined sums */- return adler | (sum2 << 16);-}--/* ========================================================================= */-uLong ZEXPORT adler32_combine(adler1, adler2, len2)- uLong adler1;- uLong adler2;- z_off_t len2;-{- unsigned long sum1;- unsigned long sum2;- unsigned rem;-- /* the derivation of this formula is left as an exercise for the reader */- rem = (unsigned)(len2 % BASE);- sum1 = adler1 & 0xffff;- sum2 = rem * sum1;- MOD(sum2);- sum1 += (adler2 & 0xffff) + BASE - 1;- sum2 += ((adler1 >> 16) & 0xffff) + ((adler2 >> 16) & 0xffff) + BASE - rem;- if (sum1 > BASE) sum1 -= BASE;- if (sum1 > BASE) sum1 -= BASE;- if (sum2 > (BASE << 1)) sum2 -= (BASE << 1);- if (sum2 > BASE) sum2 -= BASE;- return sum1 | (sum2 << 16);-}
− cbits/crc32.c
@@ -1,423 +0,0 @@-/* crc32.c -- compute the CRC-32 of a data stream- * Copyright (C) 1995-2005 Mark Adler- * For conditions of distribution and use, see copyright notice in zlib.h- *- * Thanks to Rodney Brown <rbrown64@csc.com.au> for his contribution of faster- * CRC methods: exclusive-oring 32 bits of data at a time, and pre-computing- * tables for updating the shift register in one step with three exclusive-ors- * instead of four steps with four exclusive-ors. This results in about a- * factor of two increase in speed on a Power PC G4 (PPC7455) using gcc -O3.- */--/* @(#) $Id$ */--/*- Note on the use of DYNAMIC_CRC_TABLE: there is no mutex or semaphore- protection on the static variables used to control the first-use generation- of the crc tables. Therefore, if you #define DYNAMIC_CRC_TABLE, you should- first call get_crc_table() to initialize the tables before allowing more than- one thread to use crc32().- */--#ifdef MAKECRCH-# include <stdio.h>-# ifndef DYNAMIC_CRC_TABLE-# define DYNAMIC_CRC_TABLE-# endif /* !DYNAMIC_CRC_TABLE */-#endif /* MAKECRCH */--#include "zutil.h" /* for STDC and FAR definitions */--#define local static--/* Find a four-byte integer type for crc32_little() and crc32_big(). */-#ifndef NOBYFOUR-# ifdef STDC /* need ANSI C limits.h to determine sizes */-# include <limits.h>-# define BYFOUR-# if (UINT_MAX == 0xffffffffUL)- typedef unsigned int u4;-# else-# if (ULONG_MAX == 0xffffffffUL)- typedef unsigned long u4;-# else-# if (USHRT_MAX == 0xffffffffUL)- typedef unsigned short u4;-# else-# undef BYFOUR /* can't find a four-byte integer type! */-# endif-# endif-# endif-# endif /* STDC */-#endif /* !NOBYFOUR */--/* Definitions for doing the crc four data bytes at a time. */-#ifdef BYFOUR-# define REV(w) (((w)>>24)+(((w)>>8)&0xff00)+ \- (((w)&0xff00)<<8)+(((w)&0xff)<<24))- local unsigned long crc32_little OF((unsigned long,- const unsigned char FAR *, unsigned));- local unsigned long crc32_big OF((unsigned long,- const unsigned char FAR *, unsigned));-# define TBLS 8-#else-# define TBLS 1-#endif /* BYFOUR */--/* Local functions for crc concatenation */-local unsigned long gf2_matrix_times OF((unsigned long *mat,- unsigned long vec));-local void gf2_matrix_square OF((unsigned long *square, unsigned long *mat));--#ifdef DYNAMIC_CRC_TABLE--local volatile int crc_table_empty = 1;-local unsigned long FAR crc_table[TBLS][256];-local void make_crc_table OF((void));-#ifdef MAKECRCH- local void write_table OF((FILE *, const unsigned long FAR *));-#endif /* MAKECRCH */-/*- Generate tables for a byte-wise 32-bit CRC calculation on the polynomial:- x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x+1.-- Polynomials over GF(2) are represented in binary, one bit per coefficient,- with the lowest powers in the most significant bit. Then adding polynomials- is just exclusive-or, and multiplying a polynomial by x is a right shift by- one. If we call the above polynomial p, and represent a byte as the- polynomial q, also with the lowest power in the most significant bit (so the- byte 0xb1 is the polynomial x^7+x^3+x+1), then the CRC is (q*x^32) mod p,- where a mod b means the remainder after dividing a by b.-- This calculation is done using the shift-register method of multiplying and- taking the remainder. The register is initialized to zero, and for each- incoming bit, x^32 is added mod p to the register if the bit is a one (where- x^32 mod p is p+x^32 = x^26+...+1), and the register is multiplied mod p by- x (which is shifting right by one and adding x^32 mod p if the bit shifted- out is a one). We start with the highest power (least significant bit) of- q and repeat for all eight bits of q.-- The first table is simply the CRC of all possible eight bit values. This is- all the information needed to generate CRCs on data a byte at a time for all- combinations of CRC register values and incoming bytes. The remaining tables- allow for word-at-a-time CRC calculation for both big-endian and little-- endian machines, where a word is four bytes.-*/-local void make_crc_table()-{- unsigned long c;- int n, k;- unsigned long poly; /* polynomial exclusive-or pattern */- /* terms of polynomial defining this crc (except x^32): */- static volatile int first = 1; /* flag to limit concurrent making */- static const unsigned char p[] = {0,1,2,4,5,7,8,10,11,12,16,22,23,26};-- /* See if another task is already doing this (not thread-safe, but better- than nothing -- significantly reduces duration of vulnerability in- case the advice about DYNAMIC_CRC_TABLE is ignored) */- if (first) {- first = 0;-- /* make exclusive-or pattern from polynomial (0xedb88320UL) */- poly = 0UL;- for (n = 0; n < sizeof(p)/sizeof(unsigned char); n++)- poly |= 1UL << (31 - p[n]);-- /* generate a crc for every 8-bit value */- for (n = 0; n < 256; n++) {- c = (unsigned long)n;- for (k = 0; k < 8; k++)- c = c & 1 ? poly ^ (c >> 1) : c >> 1;- crc_table[0][n] = c;- }--#ifdef BYFOUR- /* generate crc for each value followed by one, two, and three zeros,- and then the byte reversal of those as well as the first table */- for (n = 0; n < 256; n++) {- c = crc_table[0][n];- crc_table[4][n] = REV(c);- for (k = 1; k < 4; k++) {- c = crc_table[0][c & 0xff] ^ (c >> 8);- crc_table[k][n] = c;- crc_table[k + 4][n] = REV(c);- }- }-#endif /* BYFOUR */-- crc_table_empty = 0;- }- else { /* not first */- /* wait for the other guy to finish (not efficient, but rare) */- while (crc_table_empty)- ;- }--#ifdef MAKECRCH- /* write out CRC tables to crc32.h */- {- FILE *out;-- out = fopen("crc32.h", "w");- if (out == NULL) return;- fprintf(out, "/* crc32.h -- tables for rapid CRC calculation\n");- fprintf(out, " * Generated automatically by crc32.c\n */\n\n");- fprintf(out, "local const unsigned long FAR ");- fprintf(out, "crc_table[TBLS][256] =\n{\n {\n");- write_table(out, crc_table[0]);-# ifdef BYFOUR- fprintf(out, "#ifdef BYFOUR\n");- for (k = 1; k < 8; k++) {- fprintf(out, " },\n {\n");- write_table(out, crc_table[k]);- }- fprintf(out, "#endif\n");-# endif /* BYFOUR */- fprintf(out, " }\n};\n");- fclose(out);- }-#endif /* MAKECRCH */-}--#ifdef MAKECRCH-local void write_table(out, table)- FILE *out;- const unsigned long FAR *table;-{- int n;-- for (n = 0; n < 256; n++)- fprintf(out, "%s0x%08lxUL%s", n % 5 ? "" : " ", table[n],- n == 255 ? "\n" : (n % 5 == 4 ? ",\n" : ", "));-}-#endif /* MAKECRCH */--#else /* !DYNAMIC_CRC_TABLE */-/* ========================================================================- * Tables of CRC-32s of all single-byte values, made by make_crc_table().- */-#include "crc32.h"-#endif /* DYNAMIC_CRC_TABLE */--/* =========================================================================- * This function can be used by asm versions of crc32()- */-const unsigned long FAR * ZEXPORT get_crc_table()-{-#ifdef DYNAMIC_CRC_TABLE- if (crc_table_empty)- make_crc_table();-#endif /* DYNAMIC_CRC_TABLE */- return (const unsigned long FAR *)crc_table;-}--/* ========================================================================= */-#define DO1 crc = crc_table[0][((int)crc ^ (*buf++)) & 0xff] ^ (crc >> 8)-#define DO8 DO1; DO1; DO1; DO1; DO1; DO1; DO1; DO1--/* ========================================================================= */-unsigned long ZEXPORT crc32(crc, buf, len)- unsigned long crc;- const unsigned char FAR *buf;- unsigned len;-{- if (buf == Z_NULL) return 0UL;--#ifdef DYNAMIC_CRC_TABLE- if (crc_table_empty)- make_crc_table();-#endif /* DYNAMIC_CRC_TABLE */--#ifdef BYFOUR- if (sizeof(void *) == sizeof(ptrdiff_t)) {- u4 endian;-- endian = 1;- if (*((unsigned char *)(&endian)))- return crc32_little(crc, buf, len);- else- return crc32_big(crc, buf, len);- }-#endif /* BYFOUR */- crc = crc ^ 0xffffffffUL;- while (len >= 8) {- DO8;- len -= 8;- }- if (len) do {- DO1;- } while (--len);- return crc ^ 0xffffffffUL;-}--#ifdef BYFOUR--/* ========================================================================= */-#define DOLIT4 c ^= *buf4++; \- c = crc_table[3][c & 0xff] ^ crc_table[2][(c >> 8) & 0xff] ^ \- crc_table[1][(c >> 16) & 0xff] ^ crc_table[0][c >> 24]-#define DOLIT32 DOLIT4; DOLIT4; DOLIT4; DOLIT4; DOLIT4; DOLIT4; DOLIT4; DOLIT4--/* ========================================================================= */-local unsigned long crc32_little(crc, buf, len)- unsigned long crc;- const unsigned char FAR *buf;- unsigned len;-{- register u4 c;- register const u4 FAR *buf4;-- c = (u4)crc;- c = ~c;- while (len && ((ptrdiff_t)buf & 3)) {- c = crc_table[0][(c ^ *buf++) & 0xff] ^ (c >> 8);- len--;- }-- buf4 = (const u4 FAR *)(const void FAR *)buf;- while (len >= 32) {- DOLIT32;- len -= 32;- }- while (len >= 4) {- DOLIT4;- len -= 4;- }- buf = (const unsigned char FAR *)buf4;-- if (len) do {- c = crc_table[0][(c ^ *buf++) & 0xff] ^ (c >> 8);- } while (--len);- c = ~c;- return (unsigned long)c;-}--/* ========================================================================= */-#define DOBIG4 c ^= *++buf4; \- c = crc_table[4][c & 0xff] ^ crc_table[5][(c >> 8) & 0xff] ^ \- crc_table[6][(c >> 16) & 0xff] ^ crc_table[7][c >> 24]-#define DOBIG32 DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4--/* ========================================================================= */-local unsigned long crc32_big(crc, buf, len)- unsigned long crc;- const unsigned char FAR *buf;- unsigned len;-{- register u4 c;- register const u4 FAR *buf4;-- c = REV((u4)crc);- c = ~c;- while (len && ((ptrdiff_t)buf & 3)) {- c = crc_table[4][(c >> 24) ^ *buf++] ^ (c << 8);- len--;- }-- buf4 = (const u4 FAR *)(const void FAR *)buf;- buf4--;- while (len >= 32) {- DOBIG32;- len -= 32;- }- while (len >= 4) {- DOBIG4;- len -= 4;- }- buf4++;- buf = (const unsigned char FAR *)buf4;-- if (len) do {- c = crc_table[4][(c >> 24) ^ *buf++] ^ (c << 8);- } while (--len);- c = ~c;- return (unsigned long)(REV(c));-}--#endif /* BYFOUR */--#define GF2_DIM 32 /* dimension of GF(2) vectors (length of CRC) */--/* ========================================================================= */-local unsigned long gf2_matrix_times(mat, vec)- unsigned long *mat;- unsigned long vec;-{- unsigned long sum;-- sum = 0;- while (vec) {- if (vec & 1)- sum ^= *mat;- vec >>= 1;- mat++;- }- return sum;-}--/* ========================================================================= */-local void gf2_matrix_square(square, mat)- unsigned long *square;- unsigned long *mat;-{- int n;-- for (n = 0; n < GF2_DIM; n++)- square[n] = gf2_matrix_times(mat, mat[n]);-}--/* ========================================================================= */-uLong ZEXPORT crc32_combine(crc1, crc2, len2)- uLong crc1;- uLong crc2;- z_off_t len2;-{- int n;- unsigned long row;- unsigned long even[GF2_DIM]; /* even-power-of-two zeros operator */- unsigned long odd[GF2_DIM]; /* odd-power-of-two zeros operator */-- /* degenerate case */- if (len2 == 0)- return crc1;-- /* put operator for one zero bit in odd */- odd[0] = 0xedb88320L; /* CRC-32 polynomial */- row = 1;- for (n = 1; n < GF2_DIM; n++) {- odd[n] = row;- row <<= 1;- }-- /* put operator for two zero bits in even */- gf2_matrix_square(even, odd);-- /* put operator for four zero bits in odd */- gf2_matrix_square(odd, even);-- /* apply len2 zeros to crc1 (first square will put the operator for one- zero byte, eight zero bits, in even) */- do {- /* apply zeros operator for this bit of len2 */- gf2_matrix_square(even, odd);- if (len2 & 1)- crc1 = gf2_matrix_times(even, crc1);- len2 >>= 1;-- /* if no more bits set, then done */- if (len2 == 0)- break;-- /* another iteration of the loop with odd and even swapped */- gf2_matrix_square(odd, even);- if (len2 & 1)- crc1 = gf2_matrix_times(odd, crc1);- len2 >>= 1;-- /* if no more bits set, then done */- } while (len2 != 0);-- /* return combined crc */- crc1 ^= crc2;- return crc1;-}
− cbits/zlib.h
@@ -1,1357 +0,0 @@-/* zlib.h -- interface of the 'zlib' general purpose compression library- version 1.2.3, July 18th, 2005-- Copyright (C) 1995-2005 Jean-loup Gailly and Mark Adler-- This software is provided 'as-is', without any express or implied- warranty. In no event will the authors be held liable for any damages- arising from the use of this software.-- Permission is granted to anyone to use this software for any purpose,- including commercial applications, and to alter it and redistribute it- freely, subject to the following restrictions:-- 1. The origin of this software must not be misrepresented; you must not- claim that you wrote the original software. If you use this software- in a product, an acknowledgment in the product documentation would be- appreciated but is not required.- 2. Altered source versions must be plainly marked as such, and must not be- misrepresented as being the original software.- 3. This notice may not be removed or altered from any source distribution.-- Jean-loup Gailly Mark Adler- jloup@gzip.org madler@alumni.caltech.edu--- The data format used by the zlib library is described by RFCs (Request for- Comments) 1950 to 1952 in the files http://www.ietf.org/rfc/rfc1950.txt- (zlib format), rfc1951.txt (deflate format) and rfc1952.txt (gzip format).-*/--#ifndef ZLIB_H-#define ZLIB_H--#include "zconf.h"--#ifdef __cplusplus-extern "C" {-#endif--#define ZLIB_VERSION "1.2.3"-#define ZLIB_VERNUM 0x1230--/*- The 'zlib' compression library provides in-memory compression and- decompression functions, including integrity checks of the uncompressed- data. This version of the library supports only one compression method- (deflation) but other algorithms will be added later and will have the same- stream interface.-- Compression can be done in a single step if the buffers are large- enough (for example if an input file is mmap'ed), or can be done by- repeated calls of the compression function. In the latter case, the- application must provide more input and/or consume the output- (providing more output space) before each call.-- The compressed data format used by default by the in-memory functions is- the zlib format, which is a zlib wrapper documented in RFC 1950, wrapped- around a deflate stream, which is itself documented in RFC 1951.-- The library also supports reading and writing files in gzip (.gz) format- with an interface similar to that of stdio using the functions that start- with "gz". The gzip format is different from the zlib format. gzip is a- gzip wrapper, documented in RFC 1952, wrapped around a deflate stream.-- This library can optionally read and write gzip streams in memory as well.-- The zlib format was designed to be compact and fast for use in memory- and on communications channels. The gzip format was designed for single-- file compression on file systems, has a larger header than zlib to maintain- directory information, and uses a different, slower check method than zlib.-- The library does not install any signal handler. The decoder checks- the consistency of the compressed data, so the library should never- crash even in case of corrupted input.-*/--typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size));-typedef void (*free_func) OF((voidpf opaque, voidpf address));--struct internal_state;--typedef struct z_stream_s {- Bytef *next_in; /* next input byte */- uInt avail_in; /* number of bytes available at next_in */- uLong total_in; /* total nb of input bytes read so far */-- Bytef *next_out; /* next output byte should be put there */- uInt avail_out; /* remaining free space at next_out */- uLong total_out; /* total nb of bytes output so far */-- char *msg; /* last error message, NULL if no error */- struct internal_state FAR *state; /* not visible by applications */-- alloc_func zalloc; /* used to allocate the internal state */- free_func zfree; /* used to free the internal state */- voidpf opaque; /* private data object passed to zalloc and zfree */-- int data_type; /* best guess about the data type: binary or text */- uLong adler; /* adler32 value of the uncompressed data */- uLong reserved; /* reserved for future use */-} z_stream;--typedef z_stream FAR *z_streamp;--/*- gzip header information passed to and from zlib routines. See RFC 1952- for more details on the meanings of these fields.-*/-typedef struct gz_header_s {- int text; /* true if compressed data believed to be text */- uLong time; /* modification time */- int xflags; /* extra flags (not used when writing a gzip file) */- int os; /* operating system */- Bytef *extra; /* pointer to extra field or Z_NULL if none */- uInt extra_len; /* extra field length (valid if extra != Z_NULL) */- uInt extra_max; /* space at extra (only when reading header) */- Bytef *name; /* pointer to zero-terminated file name or Z_NULL */- uInt name_max; /* space at name (only when reading header) */- Bytef *comment; /* pointer to zero-terminated comment or Z_NULL */- uInt comm_max; /* space at comment (only when reading header) */- int hcrc; /* true if there was or will be a header crc */- int done; /* true when done reading gzip header (not used- when writing a gzip file) */-} gz_header;--typedef gz_header FAR *gz_headerp;--/*- The application must update next_in and avail_in when avail_in has- dropped to zero. It must update next_out and avail_out when avail_out- has dropped to zero. The application must initialize zalloc, zfree and- opaque before calling the init function. All other fields are set by the- compression library and must not be updated by the application.-- The opaque value provided by the application will be passed as the first- parameter for calls of zalloc and zfree. This can be useful for custom- memory management. The compression library attaches no meaning to the- opaque value.-- zalloc must return Z_NULL if there is not enough memory for the object.- If zlib is used in a multi-threaded application, zalloc and zfree must be- thread safe.-- On 16-bit systems, the functions zalloc and zfree must be able to allocate- exactly 65536 bytes, but will not be required to allocate more than this- if the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS,- pointers returned by zalloc for objects of exactly 65536 bytes *must*- have their offset normalized to zero. The default allocation function- provided by this library ensures this (see zutil.c). To reduce memory- requirements and avoid any allocation of 64K objects, at the expense of- compression ratio, compile the library with -DMAX_WBITS=14 (see zconf.h).-- The fields total_in and total_out can be used for statistics or- progress reports. After compression, total_in holds the total size of- the uncompressed data and may be saved for use in the decompressor- (particularly if the decompressor wants to decompress everything in- a single step).-*/-- /* constants */--#define Z_NO_FLUSH 0-#define Z_PARTIAL_FLUSH 1 /* will be removed, use Z_SYNC_FLUSH instead */-#define Z_SYNC_FLUSH 2-#define Z_FULL_FLUSH 3-#define Z_FINISH 4-#define Z_BLOCK 5-/* Allowed flush values; see deflate() and inflate() below for details */--#define Z_OK 0-#define Z_STREAM_END 1-#define Z_NEED_DICT 2-#define Z_ERRNO (-1)-#define Z_STREAM_ERROR (-2)-#define Z_DATA_ERROR (-3)-#define Z_MEM_ERROR (-4)-#define Z_BUF_ERROR (-5)-#define Z_VERSION_ERROR (-6)-/* Return codes for the compression/decompression functions. Negative- * values are errors, positive values are used for special but normal events.- */--#define Z_NO_COMPRESSION 0-#define Z_BEST_SPEED 1-#define Z_BEST_COMPRESSION 9-#define Z_DEFAULT_COMPRESSION (-1)-/* compression levels */--#define Z_FILTERED 1-#define Z_HUFFMAN_ONLY 2-#define Z_RLE 3-#define Z_FIXED 4-#define Z_DEFAULT_STRATEGY 0-/* compression strategy; see deflateInit2() below for details */--#define Z_BINARY 0-#define Z_TEXT 1-#define Z_ASCII Z_TEXT /* for compatibility with 1.2.2 and earlier */-#define Z_UNKNOWN 2-/* Possible values of the data_type field (though see inflate()) */--#define Z_DEFLATED 8-/* The deflate compression method (the only one supported in this version) */--#define Z_NULL 0 /* for initializing zalloc, zfree, opaque */--#define zlib_version zlibVersion()-/* for compatibility with versions < 1.0.2 */-- /* basic functions */--ZEXTERN const char * ZEXPORT zlibVersion OF((void));-/* The application can compare zlibVersion and ZLIB_VERSION for consistency.- If the first character differs, the library code actually used is- not compatible with the zlib.h header file used by the application.- This check is automatically made by deflateInit and inflateInit.- */--/*-ZEXTERN int ZEXPORT deflateInit OF((z_streamp strm, int level));-- Initializes the internal stream state for compression. The fields- zalloc, zfree and opaque must be initialized before by the caller.- If zalloc and zfree are set to Z_NULL, deflateInit updates them to- use default allocation functions.-- The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9:- 1 gives best speed, 9 gives best compression, 0 gives no compression at- all (the input data is simply copied a block at a time).- Z_DEFAULT_COMPRESSION requests a default compromise between speed and- compression (currently equivalent to level 6).-- deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not- enough memory, Z_STREAM_ERROR if level is not a valid compression level,- Z_VERSION_ERROR if the zlib library version (zlib_version) is incompatible- with the version assumed by the caller (ZLIB_VERSION).- msg is set to null if there is no error message. deflateInit does not- perform any compression: this will be done by deflate().-*/---ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush));-/*- deflate compresses as much data as possible, and stops when the input- buffer becomes empty or the output buffer becomes full. It may introduce some- output latency (reading input without producing any output) except when- forced to flush.-- The detailed semantics are as follows. deflate performs one or both of the- following actions:-- - Compress more input starting at next_in and update next_in and avail_in- accordingly. If not all input can be processed (because there is not- enough room in the output buffer), next_in and avail_in are updated and- processing will resume at this point for the next call of deflate().-- - Provide more output starting at next_out and update next_out and avail_out- accordingly. This action is forced if the parameter flush is non zero.- Forcing flush frequently degrades the compression ratio, so this parameter- should be set only when necessary (in interactive applications).- Some output may be provided even if flush is not set.-- Before the call of deflate(), the application should ensure that at least- one of the actions is possible, by providing more input and/or consuming- more output, and updating avail_in or avail_out accordingly; avail_out- should never be zero before the call. The application can consume the- compressed output when it wants, for example when the output buffer is full- (avail_out == 0), or after each call of deflate(). If deflate returns Z_OK- and with zero avail_out, it must be called again after making room in the- output buffer because there might be more output pending.-- Normally the parameter flush is set to Z_NO_FLUSH, which allows deflate to- decide how much data to accumualte before producing output, in order to- maximize compression.-- If the parameter flush is set to Z_SYNC_FLUSH, all pending output is- flushed to the output buffer and the output is aligned on a byte boundary, so- that the decompressor can get all input data available so far. (In particular- avail_in is zero after the call if enough output space has been provided- before the call.) Flushing may degrade compression for some compression- algorithms and so it should be used only when necessary.-- If flush is set to Z_FULL_FLUSH, all output is flushed as with- Z_SYNC_FLUSH, and the compression state is reset so that decompression can- restart from this point if previous compressed data has been damaged or if- random access is desired. Using Z_FULL_FLUSH too often can seriously degrade- compression.-- If deflate returns with avail_out == 0, this function must be called again- with the same value of the flush parameter and more output space (updated- avail_out), until the flush is complete (deflate returns with non-zero- avail_out). In the case of a Z_FULL_FLUSH or Z_SYNC_FLUSH, make sure that- avail_out is greater than six to avoid repeated flush markers due to- avail_out == 0 on return.-- If the parameter flush is set to Z_FINISH, pending input is processed,- pending output is flushed and deflate returns with Z_STREAM_END if there- was enough output space; if deflate returns with Z_OK, this function must be- called again with Z_FINISH and more output space (updated avail_out) but no- more input data, until it returns with Z_STREAM_END or an error. After- deflate has returned Z_STREAM_END, the only possible operations on the- stream are deflateReset or deflateEnd.-- Z_FINISH can be used immediately after deflateInit if all the compression- is to be done in a single step. In this case, avail_out must be at least- the value returned by deflateBound (see below). If deflate does not return- Z_STREAM_END, then it must be called again as described above.-- deflate() sets strm->adler to the adler32 checksum of all input read- so far (that is, total_in bytes).-- deflate() may update strm->data_type if it can make a good guess about- the input data type (Z_BINARY or Z_TEXT). In doubt, the data is considered- binary. This field is only for information purposes and does not affect- the compression algorithm in any manner.-- deflate() returns Z_OK if some progress has been made (more input- processed or more output produced), Z_STREAM_END if all input has been- consumed and all output has been produced (only when flush is set to- Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example- if next_in or next_out was NULL), Z_BUF_ERROR if no progress is possible- (for example avail_in or avail_out was zero). Note that Z_BUF_ERROR is not- fatal, and deflate() can be called again with more input and more output- space to continue compressing.-*/---ZEXTERN int ZEXPORT deflateEnd OF((z_streamp strm));-/*- All dynamically allocated data structures for this stream are freed.- This function discards any unprocessed input and does not flush any- pending output.-- deflateEnd returns Z_OK if success, Z_STREAM_ERROR if the- stream state was inconsistent, Z_DATA_ERROR if the stream was freed- prematurely (some input or output was discarded). In the error case,- msg may be set but then points to a static string (which must not be- deallocated).-*/---/*-ZEXTERN int ZEXPORT inflateInit OF((z_streamp strm));-- Initializes the internal stream state for decompression. The fields- next_in, avail_in, zalloc, zfree and opaque must be initialized before by- the caller. If next_in is not Z_NULL and avail_in is large enough (the exact- value depends on the compression method), inflateInit determines the- compression method from the zlib header and allocates all data structures- accordingly; otherwise the allocation will be deferred to the first call of- inflate. If zalloc and zfree are set to Z_NULL, inflateInit updates them to- use default allocation functions.-- inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough- memory, Z_VERSION_ERROR if the zlib library version is incompatible with the- version assumed by the caller. msg is set to null if there is no error- message. inflateInit does not perform any decompression apart from reading- the zlib header if present: this will be done by inflate(). (So next_in and- avail_in may be modified, but next_out and avail_out are unchanged.)-*/---ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush));-/*- inflate decompresses as much data as possible, and stops when the input- buffer becomes empty or the output buffer becomes full. It may introduce- some output latency (reading input without producing any output) except when- forced to flush.-- The detailed semantics are as follows. inflate performs one or both of the- following actions:-- - Decompress more input starting at next_in and update next_in and avail_in- accordingly. If not all input can be processed (because there is not- enough room in the output buffer), next_in is updated and processing- will resume at this point for the next call of inflate().-- - Provide more output starting at next_out and update next_out and avail_out- accordingly. inflate() provides as much output as possible, until there- is no more input data or no more space in the output buffer (see below- about the flush parameter).-- Before the call of inflate(), the application should ensure that at least- one of the actions is possible, by providing more input and/or consuming- more output, and updating the next_* and avail_* values accordingly.- The application can consume the uncompressed output when it wants, for- example when the output buffer is full (avail_out == 0), or after each- call of inflate(). If inflate returns Z_OK and with zero avail_out, it- must be called again after making room in the output buffer because there- might be more output pending.-- The flush parameter of inflate() can be Z_NO_FLUSH, Z_SYNC_FLUSH,- Z_FINISH, or Z_BLOCK. Z_SYNC_FLUSH requests that inflate() flush as much- output as possible to the output buffer. Z_BLOCK requests that inflate() stop- if and when it gets to the next deflate block boundary. When decoding the- zlib or gzip format, this will cause inflate() to return immediately after- the header and before the first block. When doing a raw inflate, inflate()- will go ahead and process the first block, and will return when it gets to- the end of that block, or when it runs out of data.-- The Z_BLOCK option assists in appending to or combining deflate streams.- Also to assist in this, on return inflate() will set strm->data_type to the- number of unused bits in the last byte taken from strm->next_in, plus 64- if inflate() is currently decoding the last block in the deflate stream,- plus 128 if inflate() returned immediately after decoding an end-of-block- code or decoding the complete header up to just before the first byte of the- deflate stream. The end-of-block will not be indicated until all of the- uncompressed data from that block has been written to strm->next_out. The- number of unused bits may in general be greater than seven, except when- bit 7 of data_type is set, in which case the number of unused bits will be- less than eight.-- inflate() should normally be called until it returns Z_STREAM_END or an- error. However if all decompression is to be performed in a single step- (a single call of inflate), the parameter flush should be set to- Z_FINISH. In this case all pending input is processed and all pending- output is flushed; avail_out must be large enough to hold all the- uncompressed data. (The size of the uncompressed data may have been saved- by the compressor for this purpose.) The next operation on this stream must- be inflateEnd to deallocate the decompression state. The use of Z_FINISH- is never required, but can be used to inform inflate that a faster approach- may be used for the single inflate() call.-- In this implementation, inflate() always flushes as much output as- possible to the output buffer, and always uses the faster approach on the- first call. So the only effect of the flush parameter in this implementation- is on the return value of inflate(), as noted below, or when it returns early- because Z_BLOCK is used.-- If a preset dictionary is needed after this call (see inflateSetDictionary- below), inflate sets strm->adler to the adler32 checksum of the dictionary- chosen by the compressor and returns Z_NEED_DICT; otherwise it sets- strm->adler to the adler32 checksum of all output produced so far (that is,- total_out bytes) and returns Z_OK, Z_STREAM_END or an error code as described- below. At the end of the stream, inflate() checks that its computed adler32- checksum is equal to that saved by the compressor and returns Z_STREAM_END- only if the checksum is correct.-- inflate() will decompress and check either zlib-wrapped or gzip-wrapped- deflate data. The header type is detected automatically. Any information- contained in the gzip header is not retained, so applications that need that- information should instead use raw inflate, see inflateInit2() below, or- inflateBack() and perform their own processing of the gzip header and- trailer.-- inflate() returns Z_OK if some progress has been made (more input processed- or more output produced), Z_STREAM_END if the end of the compressed data has- been reached and all uncompressed output has been produced, Z_NEED_DICT if a- preset dictionary is needed at this point, Z_DATA_ERROR if the input data was- corrupted (input stream not conforming to the zlib format or incorrect check- value), Z_STREAM_ERROR if the stream structure was inconsistent (for example- if next_in or next_out was NULL), Z_MEM_ERROR if there was not enough memory,- Z_BUF_ERROR if no progress is possible or if there was not enough room in the- output buffer when Z_FINISH is used. Note that Z_BUF_ERROR is not fatal, and- inflate() can be called again with more input and more output space to- continue decompressing. If Z_DATA_ERROR is returned, the application may then- call inflateSync() to look for a good compression block if a partial recovery- of the data is desired.-*/---ZEXTERN int ZEXPORT inflateEnd OF((z_streamp strm));-/*- All dynamically allocated data structures for this stream are freed.- This function discards any unprocessed input and does not flush any- pending output.-- inflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state- was inconsistent. In the error case, msg may be set but then points to a- static string (which must not be deallocated).-*/-- /* Advanced functions */--/*- The following functions are needed only in some special applications.-*/--/*-ZEXTERN int ZEXPORT deflateInit2 OF((z_streamp strm,- int level,- int method,- int windowBits,- int memLevel,- int strategy));-- This is another version of deflateInit with more compression options. The- fields next_in, zalloc, zfree and opaque must be initialized before by- the caller.-- The method parameter is the compression method. It must be Z_DEFLATED in- this version of the library.-- The windowBits parameter is the base two logarithm of the window size- (the size of the history buffer). It should be in the range 8..15 for this- version of the library. Larger values of this parameter result in better- compression at the expense of memory usage. The default value is 15 if- deflateInit is used instead.-- windowBits can also be -8..-15 for raw deflate. In this case, -windowBits- determines the window size. deflate() will then generate raw deflate data- with no zlib header or trailer, and will not compute an adler32 check value.-- windowBits can also be greater than 15 for optional gzip encoding. Add- 16 to windowBits to write a simple gzip header and trailer around the- compressed data instead of a zlib wrapper. The gzip header will have no- file name, no extra data, no comment, no modification time (set to zero),- no header crc, and the operating system will be set to 255 (unknown). If a- gzip stream is being written, strm->adler is a crc32 instead of an adler32.-- The memLevel parameter specifies how much memory should be allocated- for the internal compression state. memLevel=1 uses minimum memory but- is slow and reduces compression ratio; memLevel=9 uses maximum memory- for optimal speed. The default value is 8. See zconf.h for total memory- usage as a function of windowBits and memLevel.-- The strategy parameter is used to tune the compression algorithm. Use the- value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data produced by a- filter (or predictor), Z_HUFFMAN_ONLY to force Huffman encoding only (no- string match), or Z_RLE to limit match distances to one (run-length- encoding). Filtered data consists mostly of small values with a somewhat- random distribution. In this case, the compression algorithm is tuned to- compress them better. The effect of Z_FILTERED is to force more Huffman- coding and less string matching; it is somewhat intermediate between- Z_DEFAULT and Z_HUFFMAN_ONLY. Z_RLE is designed to be almost as fast as- Z_HUFFMAN_ONLY, but give better compression for PNG image data. The strategy- parameter only affects the compression ratio but not the correctness of the- compressed output even if it is not set appropriately. Z_FIXED prevents the- use of dynamic Huffman codes, allowing for a simpler decoder for special- applications.-- deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough- memory, Z_STREAM_ERROR if a parameter is invalid (such as an invalid- method). msg is set to null if there is no error message. deflateInit2 does- not perform any compression: this will be done by deflate().-*/--ZEXTERN int ZEXPORT deflateSetDictionary OF((z_streamp strm,- const Bytef *dictionary,- uInt dictLength));-/*- Initializes the compression dictionary from the given byte sequence- without producing any compressed output. This function must be called- immediately after deflateInit, deflateInit2 or deflateReset, before any- call of deflate. The compressor and decompressor must use exactly the same- dictionary (see inflateSetDictionary).-- The dictionary should consist of strings (byte sequences) that are likely- to be encountered later in the data to be compressed, with the most commonly- used strings preferably put towards the end of the dictionary. Using a- dictionary is most useful when the data to be compressed is short and can be- predicted with good accuracy; the data can then be compressed better than- with the default empty dictionary.-- Depending on the size of the compression data structures selected by- deflateInit or deflateInit2, a part of the dictionary may in effect be- discarded, for example if the dictionary is larger than the window size in- deflate or deflate2. Thus the strings most likely to be useful should be- put at the end of the dictionary, not at the front. In addition, the- current implementation of deflate will use at most the window size minus- 262 bytes of the provided dictionary.-- Upon return of this function, strm->adler is set to the adler32 value- of the dictionary; the decompressor may later use this value to determine- which dictionary has been used by the compressor. (The adler32 value- applies to the whole dictionary even if only a subset of the dictionary is- actually used by the compressor.) If a raw deflate was requested, then the- adler32 value is not computed and strm->adler is not set.-- deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a- parameter is invalid (such as NULL dictionary) or the stream state is- inconsistent (for example if deflate has already been called for this stream- or if the compression method is bsort). deflateSetDictionary does not- perform any compression: this will be done by deflate().-*/--ZEXTERN int ZEXPORT deflateCopy OF((z_streamp dest,- z_streamp source));-/*- Sets the destination stream as a complete copy of the source stream.-- This function can be useful when several compression strategies will be- tried, for example when there are several ways of pre-processing the input- data with a filter. The streams that will be discarded should then be freed- by calling deflateEnd. Note that deflateCopy duplicates the internal- compression state which can be quite large, so this strategy is slow and- can consume lots of memory.-- deflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not- enough memory, Z_STREAM_ERROR if the source stream state was inconsistent- (such as zalloc being NULL). msg is left unchanged in both source and- destination.-*/--ZEXTERN int ZEXPORT deflateReset OF((z_streamp strm));-/*- This function is equivalent to deflateEnd followed by deflateInit,- but does not free and reallocate all the internal compression state.- The stream will keep the same compression level and any other attributes- that may have been set by deflateInit2.-- deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source- stream state was inconsistent (such as zalloc or state being NULL).-*/--ZEXTERN int ZEXPORT deflateParams OF((z_streamp strm,- int level,- int strategy));-/*- Dynamically update the compression level and compression strategy. The- interpretation of level and strategy is as in deflateInit2. This can be- used to switch between compression and straight copy of the input data, or- to switch to a different kind of input data requiring a different- strategy. If the compression level is changed, the input available so far- is compressed with the old level (and may be flushed); the new level will- take effect only at the next call of deflate().-- Before the call of deflateParams, the stream state must be set as for- a call of deflate(), since the currently available input may have to- be compressed and flushed. In particular, strm->avail_out must be non-zero.-- deflateParams returns Z_OK if success, Z_STREAM_ERROR if the source- stream state was inconsistent or if a parameter was invalid, Z_BUF_ERROR- if strm->avail_out was zero.-*/--ZEXTERN int ZEXPORT deflateTune OF((z_streamp strm,- int good_length,- int max_lazy,- int nice_length,- int max_chain));-/*- Fine tune deflate's internal compression parameters. This should only be- used by someone who understands the algorithm used by zlib's deflate for- searching for the best matching string, and even then only by the most- fanatic optimizer trying to squeeze out the last compressed bit for their- specific input data. Read the deflate.c source code for the meaning of the- max_lazy, good_length, nice_length, and max_chain parameters.-- deflateTune() can be called after deflateInit() or deflateInit2(), and- returns Z_OK on success, or Z_STREAM_ERROR for an invalid deflate stream.- */--ZEXTERN uLong ZEXPORT deflateBound OF((z_streamp strm,- uLong sourceLen));-/*- deflateBound() returns an upper bound on the compressed size after- deflation of sourceLen bytes. It must be called after deflateInit()- or deflateInit2(). This would be used to allocate an output buffer- for deflation in a single pass, and so would be called before deflate().-*/--ZEXTERN int ZEXPORT deflatePrime OF((z_streamp strm,- int bits,- int value));-/*- deflatePrime() inserts bits in the deflate output stream. The intent- is that this function is used to start off the deflate output with the- bits leftover from a previous deflate stream when appending to it. As such,- this function can only be used for raw deflate, and must be used before the- first deflate() call after a deflateInit2() or deflateReset(). bits must be- less than or equal to 16, and that many of the least significant bits of- value will be inserted in the output.-- deflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source- stream state was inconsistent.-*/--ZEXTERN int ZEXPORT deflateSetHeader OF((z_streamp strm,- gz_headerp head));-/*- deflateSetHeader() provides gzip header information for when a gzip- stream is requested by deflateInit2(). deflateSetHeader() may be called- after deflateInit2() or deflateReset() and before the first call of- deflate(). The text, time, os, extra field, name, and comment information- in the provided gz_header structure are written to the gzip header (xflag is- ignored -- the extra flags are set according to the compression level). The- caller must assure that, if not Z_NULL, name and comment are terminated with- a zero byte, and that if extra is not Z_NULL, that extra_len bytes are- available there. If hcrc is true, a gzip header crc is included. Note that- the current versions of the command-line version of gzip (up through version- 1.3.x) do not support header crc's, and will report that it is a "multi-part- gzip file" and give up.-- If deflateSetHeader is not used, the default gzip header has text false,- the time set to zero, and os set to 255, with no extra, name, or comment- fields. The gzip header is returned to the default state by deflateReset().-- deflateSetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source- stream state was inconsistent.-*/--/*-ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm,- int windowBits));-- This is another version of inflateInit with an extra parameter. The- fields next_in, avail_in, zalloc, zfree and opaque must be initialized- before by the caller.-- The windowBits parameter is the base two logarithm of the maximum window- size (the size of the history buffer). It should be in the range 8..15 for- this version of the library. The default value is 15 if inflateInit is used- instead. windowBits must be greater than or equal to the windowBits value- provided to deflateInit2() while compressing, or it must be equal to 15 if- deflateInit2() was not used. If a compressed stream with a larger window- size is given as input, inflate() will return with the error code- Z_DATA_ERROR instead of trying to allocate a larger window.-- windowBits can also be -8..-15 for raw inflate. In this case, -windowBits- determines the window size. inflate() will then process raw deflate data,- not looking for a zlib or gzip header, not generating a check value, and not- looking for any check values for comparison at the end of the stream. This- is for use with other formats that use the deflate compressed data format- such as zip. Those formats provide their own check values. If a custom- format is developed using the raw deflate format for compressed data, it is- recommended that a check value such as an adler32 or a crc32 be applied to- the uncompressed data as is done in the zlib, gzip, and zip formats. For- most applications, the zlib format should be used as is. Note that comments- above on the use in deflateInit2() applies to the magnitude of windowBits.-- windowBits can also be greater than 15 for optional gzip decoding. Add- 32 to windowBits to enable zlib and gzip decoding with automatic header- detection, or add 16 to decode only the gzip format (the zlib format will- return a Z_DATA_ERROR). If a gzip stream is being decoded, strm->adler is- a crc32 instead of an adler32.-- inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough- memory, Z_STREAM_ERROR if a parameter is invalid (such as a null strm). msg- is set to null if there is no error message. inflateInit2 does not perform- any decompression apart from reading the zlib header if present: this will- be done by inflate(). (So next_in and avail_in may be modified, but next_out- and avail_out are unchanged.)-*/--ZEXTERN int ZEXPORT inflateSetDictionary OF((z_streamp strm,- const Bytef *dictionary,- uInt dictLength));-/*- Initializes the decompression dictionary from the given uncompressed byte- sequence. This function must be called immediately after a call of inflate,- if that call returned Z_NEED_DICT. The dictionary chosen by the compressor- can be determined from the adler32 value returned by that call of inflate.- The compressor and decompressor must use exactly the same dictionary (see- deflateSetDictionary). For raw inflate, this function can be called- immediately after inflateInit2() or inflateReset() and before any call of- inflate() to set the dictionary. The application must insure that the- dictionary that was used for compression is provided.-- inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a- parameter is invalid (such as NULL dictionary) or the stream state is- inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the- expected one (incorrect adler32 value). inflateSetDictionary does not- perform any decompression: this will be done by subsequent calls of- inflate().-*/--ZEXTERN int ZEXPORT inflateSync OF((z_streamp strm));-/*- Skips invalid compressed data until a full flush point (see above the- description of deflate with Z_FULL_FLUSH) can be found, or until all- available input is skipped. No output is provided.-- inflateSync returns Z_OK if a full flush point has been found, Z_BUF_ERROR- if no more input was provided, Z_DATA_ERROR if no flush point has been found,- or Z_STREAM_ERROR if the stream structure was inconsistent. In the success- case, the application may save the current current value of total_in which- indicates where valid compressed data was found. In the error case, the- application may repeatedly call inflateSync, providing more input each time,- until success or end of the input data.-*/--ZEXTERN int ZEXPORT inflateCopy OF((z_streamp dest,- z_streamp source));-/*- Sets the destination stream as a complete copy of the source stream.-- This function can be useful when randomly accessing a large stream. The- first pass through the stream can periodically record the inflate state,- allowing restarting inflate at those points when randomly accessing the- stream.-- inflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not- enough memory, Z_STREAM_ERROR if the source stream state was inconsistent- (such as zalloc being NULL). msg is left unchanged in both source and- destination.-*/--ZEXTERN int ZEXPORT inflateReset OF((z_streamp strm));-/*- This function is equivalent to inflateEnd followed by inflateInit,- but does not free and reallocate all the internal decompression state.- The stream will keep attributes that may have been set by inflateInit2.-- inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source- stream state was inconsistent (such as zalloc or state being NULL).-*/--ZEXTERN int ZEXPORT inflatePrime OF((z_streamp strm,- int bits,- int value));-/*- This function inserts bits in the inflate input stream. The intent is- that this function is used to start inflating at a bit position in the- middle of a byte. The provided bits will be used before any bytes are used- from next_in. This function should only be used with raw inflate, and- should be used before the first inflate() call after inflateInit2() or- inflateReset(). bits must be less than or equal to 16, and that many of the- least significant bits of value will be inserted in the input.-- inflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source- stream state was inconsistent.-*/--ZEXTERN int ZEXPORT inflateGetHeader OF((z_streamp strm,- gz_headerp head));-/*- inflateGetHeader() requests that gzip header information be stored in the- provided gz_header structure. inflateGetHeader() may be called after- inflateInit2() or inflateReset(), and before the first call of inflate().- As inflate() processes the gzip stream, head->done is zero until the header- is completed, at which time head->done is set to one. If a zlib stream is- being decoded, then head->done is set to -1 to indicate that there will be- no gzip header information forthcoming. Note that Z_BLOCK can be used to- force inflate() to return immediately after header processing is complete- and before any actual data is decompressed.-- The text, time, xflags, and os fields are filled in with the gzip header- contents. hcrc is set to true if there is a header CRC. (The header CRC- was valid if done is set to one.) If extra is not Z_NULL, then extra_max- contains the maximum number of bytes to write to extra. Once done is true,- extra_len contains the actual extra field length, and extra contains the- extra field, or that field truncated if extra_max is less than extra_len.- If name is not Z_NULL, then up to name_max characters are written there,- terminated with a zero unless the length is greater than name_max. If- comment is not Z_NULL, then up to comm_max characters are written there,- terminated with a zero unless the length is greater than comm_max. When- any of extra, name, or comment are not Z_NULL and the respective field is- not present in the header, then that field is set to Z_NULL to signal its- absence. This allows the use of deflateSetHeader() with the returned- structure to duplicate the header. However if those fields are set to- allocated memory, then the application will need to save those pointers- elsewhere so that they can be eventually freed.-- If inflateGetHeader is not used, then the header information is simply- discarded. The header is always checked for validity, including the header- CRC if present. inflateReset() will reset the process to discard the header- information. The application would need to call inflateGetHeader() again to- retrieve the header from the next gzip stream.-- inflateGetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source- stream state was inconsistent.-*/--/*-ZEXTERN int ZEXPORT inflateBackInit OF((z_streamp strm, int windowBits,- unsigned char FAR *window));-- Initialize the internal stream state for decompression using inflateBack()- calls. The fields zalloc, zfree and opaque in strm must be initialized- before the call. If zalloc and zfree are Z_NULL, then the default library-- derived memory allocation routines are used. windowBits is the base two- logarithm of the window size, in the range 8..15. window is a caller- supplied buffer of that size. Except for special applications where it is- assured that deflate was used with small window sizes, windowBits must be 15- and a 32K byte window must be supplied to be able to decompress general- deflate streams.-- See inflateBack() for the usage of these routines.-- inflateBackInit will return Z_OK on success, Z_STREAM_ERROR if any of- the paramaters are invalid, Z_MEM_ERROR if the internal state could not- be allocated, or Z_VERSION_ERROR if the version of the library does not- match the version of the header file.-*/--typedef unsigned (*in_func) OF((void FAR *, unsigned char FAR * FAR *));-typedef int (*out_func) OF((void FAR *, unsigned char FAR *, unsigned));--ZEXTERN int ZEXPORT inflateBack OF((z_streamp strm,- in_func in, void FAR *in_desc,- out_func out, void FAR *out_desc));-/*- inflateBack() does a raw inflate with a single call using a call-back- interface for input and output. This is more efficient than inflate() for- file i/o applications in that it avoids copying between the output and the- sliding window by simply making the window itself the output buffer. This- function trusts the application to not change the output buffer passed by- the output function, at least until inflateBack() returns.-- inflateBackInit() must be called first to allocate the internal state- and to initialize the state with the user-provided window buffer.- inflateBack() may then be used multiple times to inflate a complete, raw- deflate stream with each call. inflateBackEnd() is then called to free- the allocated state.-- A raw deflate stream is one with no zlib or gzip header or trailer.- This routine would normally be used in a utility that reads zip or gzip- files and writes out uncompressed files. The utility would decode the- header and process the trailer on its own, hence this routine expects- only the raw deflate stream to decompress. This is different from the- normal behavior of inflate(), which expects either a zlib or gzip header and- trailer around the deflate stream.-- inflateBack() uses two subroutines supplied by the caller that are then- called by inflateBack() for input and output. inflateBack() calls those- routines until it reads a complete deflate stream and writes out all of the- uncompressed data, or until it encounters an error. The function's- parameters and return types are defined above in the in_func and out_func- typedefs. inflateBack() will call in(in_desc, &buf) which should return the- number of bytes of provided input, and a pointer to that input in buf. If- there is no input available, in() must return zero--buf is ignored in that- case--and inflateBack() will return a buffer error. inflateBack() will call- out(out_desc, buf, len) to write the uncompressed data buf[0..len-1]. out()- should return zero on success, or non-zero on failure. If out() returns- non-zero, inflateBack() will return with an error. Neither in() nor out()- are permitted to change the contents of the window provided to- inflateBackInit(), which is also the buffer that out() uses to write from.- The length written by out() will be at most the window size. Any non-zero- amount of input may be provided by in().-- For convenience, inflateBack() can be provided input on the first call by- setting strm->next_in and strm->avail_in. If that input is exhausted, then- in() will be called. Therefore strm->next_in must be initialized before- calling inflateBack(). If strm->next_in is Z_NULL, then in() will be called- immediately for input. If strm->next_in is not Z_NULL, then strm->avail_in- must also be initialized, and then if strm->avail_in is not zero, input will- initially be taken from strm->next_in[0 .. strm->avail_in - 1].-- The in_desc and out_desc parameters of inflateBack() is passed as the- first parameter of in() and out() respectively when they are called. These- descriptors can be optionally used to pass any information that the caller-- supplied in() and out() functions need to do their job.-- On return, inflateBack() will set strm->next_in and strm->avail_in to- pass back any unused input that was provided by the last in() call. The- return values of inflateBack() can be Z_STREAM_END on success, Z_BUF_ERROR- if in() or out() returned an error, Z_DATA_ERROR if there was a format- error in the deflate stream (in which case strm->msg is set to indicate the- nature of the error), or Z_STREAM_ERROR if the stream was not properly- initialized. In the case of Z_BUF_ERROR, an input or output error can be- distinguished using strm->next_in which will be Z_NULL only if in() returned- an error. If strm->next is not Z_NULL, then the Z_BUF_ERROR was due to- out() returning non-zero. (in() will always be called before out(), so- strm->next_in is assured to be defined if out() returns non-zero.) Note- that inflateBack() cannot return Z_OK.-*/--ZEXTERN int ZEXPORT inflateBackEnd OF((z_streamp strm));-/*- All memory allocated by inflateBackInit() is freed.-- inflateBackEnd() returns Z_OK on success, or Z_STREAM_ERROR if the stream- state was inconsistent.-*/--ZEXTERN uLong ZEXPORT zlibCompileFlags OF((void));-/* Return flags indicating compile-time options.-- Type sizes, two bits each, 00 = 16 bits, 01 = 32, 10 = 64, 11 = other:- 1.0: size of uInt- 3.2: size of uLong- 5.4: size of voidpf (pointer)- 7.6: size of z_off_t-- Compiler, assembler, and debug options:- 8: DEBUG- 9: ASMV or ASMINF -- use ASM code- 10: ZLIB_WINAPI -- exported functions use the WINAPI calling convention- 11: 0 (reserved)-- One-time table building (smaller code, but not thread-safe if true):- 12: BUILDFIXED -- build static block decoding tables when needed- 13: DYNAMIC_CRC_TABLE -- build CRC calculation tables when needed- 14,15: 0 (reserved)-- Library content (indicates missing functionality):- 16: NO_GZCOMPRESS -- gz* functions cannot compress (to avoid linking- deflate code when not needed)- 17: NO_GZIP -- deflate can't write gzip streams, and inflate can't detect- and decode gzip streams (to avoid linking crc code)- 18-19: 0 (reserved)-- Operation variations (changes in library functionality):- 20: PKZIP_BUG_WORKAROUND -- slightly more permissive inflate- 21: FASTEST -- deflate algorithm with only one, lowest compression level- 22,23: 0 (reserved)-- The sprintf variant used by gzprintf (zero is best):- 24: 0 = vs*, 1 = s* -- 1 means limited to 20 arguments after the format- 25: 0 = *nprintf, 1 = *printf -- 1 means gzprintf() not secure!- 26: 0 = returns value, 1 = void -- 1 means inferred string length returned-- Remainder:- 27-31: 0 (reserved)- */--- /* utility functions */--/*- The following utility functions are implemented on top of the- basic stream-oriented functions. To simplify the interface, some- default options are assumed (compression level and memory usage,- standard memory allocation functions). The source code of these- utility functions can easily be modified if you need special options.-*/--ZEXTERN int ZEXPORT compress OF((Bytef *dest, uLongf *destLen,- const Bytef *source, uLong sourceLen));-/*- Compresses the source buffer into the destination buffer. sourceLen is- the byte length of the source buffer. Upon entry, destLen is the total- size of the destination buffer, which must be at least the value returned- by compressBound(sourceLen). Upon exit, destLen is the actual size of the- compressed buffer.- This function can be used to compress a whole file at once if the- input file is mmap'ed.- compress returns Z_OK if success, Z_MEM_ERROR if there was not- enough memory, Z_BUF_ERROR if there was not enough room in the output- buffer.-*/--ZEXTERN int ZEXPORT compress2 OF((Bytef *dest, uLongf *destLen,- const Bytef *source, uLong sourceLen,- int level));-/*- Compresses the source buffer into the destination buffer. The level- parameter has the same meaning as in deflateInit. sourceLen is the byte- length of the source buffer. Upon entry, destLen is the total size of the- destination buffer, which must be at least the value returned by- compressBound(sourceLen). Upon exit, destLen is the actual size of the- compressed buffer.-- compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough- memory, Z_BUF_ERROR if there was not enough room in the output buffer,- Z_STREAM_ERROR if the level parameter is invalid.-*/--ZEXTERN uLong ZEXPORT compressBound OF((uLong sourceLen));-/*- compressBound() returns an upper bound on the compressed size after- compress() or compress2() on sourceLen bytes. It would be used before- a compress() or compress2() call to allocate the destination buffer.-*/--ZEXTERN int ZEXPORT uncompress OF((Bytef *dest, uLongf *destLen,- const Bytef *source, uLong sourceLen));-/*- Decompresses the source buffer into the destination buffer. sourceLen is- the byte length of the source buffer. Upon entry, destLen is the total- size of the destination buffer, which must be large enough to hold the- entire uncompressed data. (The size of the uncompressed data must have- been saved previously by the compressor and transmitted to the decompressor- by some mechanism outside the scope of this compression library.)- Upon exit, destLen is the actual size of the compressed buffer.- This function can be used to decompress a whole file at once if the- input file is mmap'ed.-- uncompress returns Z_OK if success, Z_MEM_ERROR if there was not- enough memory, Z_BUF_ERROR if there was not enough room in the output- buffer, or Z_DATA_ERROR if the input data was corrupted or incomplete.-*/---typedef voidp gzFile;--ZEXTERN gzFile ZEXPORT gzopen OF((const char *path, const char *mode));-/*- Opens a gzip (.gz) file for reading or writing. The mode parameter- is as in fopen ("rb" or "wb") but can also include a compression level- ("wb9") or a strategy: 'f' for filtered data as in "wb6f", 'h' for- Huffman only compression as in "wb1h", or 'R' for run-length encoding- as in "wb1R". (See the description of deflateInit2 for more information- about the strategy parameter.)-- gzopen can be used to read a file which is not in gzip format; in this- case gzread will directly read from the file without decompression.-- gzopen returns NULL if the file could not be opened or if there was- insufficient memory to allocate the (de)compression state; errno- can be checked to distinguish the two cases (if errno is zero, the- zlib error is Z_MEM_ERROR). */--ZEXTERN gzFile ZEXPORT gzdopen OF((int fd, const char *mode));-/*- gzdopen() associates a gzFile with the file descriptor fd. File- descriptors are obtained from calls like open, dup, creat, pipe or- fileno (in the file has been previously opened with fopen).- The mode parameter is as in gzopen.- The next call of gzclose on the returned gzFile will also close the- file descriptor fd, just like fclose(fdopen(fd), mode) closes the file- descriptor fd. If you want to keep fd open, use gzdopen(dup(fd), mode).- gzdopen returns NULL if there was insufficient memory to allocate- the (de)compression state.-*/--ZEXTERN int ZEXPORT gzsetparams OF((gzFile file, int level, int strategy));-/*- Dynamically update the compression level or strategy. See the description- of deflateInit2 for the meaning of these parameters.- gzsetparams returns Z_OK if success, or Z_STREAM_ERROR if the file was not- opened for writing.-*/--ZEXTERN int ZEXPORT gzread OF((gzFile file, voidp buf, unsigned len));-/*- Reads the given number of uncompressed bytes from the compressed file.- If the input file was not in gzip format, gzread copies the given number- of bytes into the buffer.- gzread returns the number of uncompressed bytes actually read (0 for- end of file, -1 for error). */--ZEXTERN int ZEXPORT gzwrite OF((gzFile file,- voidpc buf, unsigned len));-/*- Writes the given number of uncompressed bytes into the compressed file.- gzwrite returns the number of uncompressed bytes actually written- (0 in case of error).-*/--ZEXTERN int ZEXPORTVA gzprintf OF((gzFile file, const char *format, ...));-/*- Converts, formats, and writes the args to the compressed file under- control of the format string, as in fprintf. gzprintf returns the number of- uncompressed bytes actually written (0 in case of error). The number of- uncompressed bytes written is limited to 4095. The caller should assure that- this limit is not exceeded. If it is exceeded, then gzprintf() will return- return an error (0) with nothing written. In this case, there may also be a- buffer overflow with unpredictable consequences, which is possible only if- zlib was compiled with the insecure functions sprintf() or vsprintf()- because the secure snprintf() or vsnprintf() functions were not available.-*/--ZEXTERN int ZEXPORT gzputs OF((gzFile file, const char *s));-/*- Writes the given null-terminated string to the compressed file, excluding- the terminating null character.- gzputs returns the number of characters written, or -1 in case of error.-*/--ZEXTERN char * ZEXPORT gzgets OF((gzFile file, char *buf, int len));-/*- Reads bytes from the compressed file until len-1 characters are read, or- a newline character is read and transferred to buf, or an end-of-file- condition is encountered. The string is then terminated with a null- character.- gzgets returns buf, or Z_NULL in case of error.-*/--ZEXTERN int ZEXPORT gzputc OF((gzFile file, int c));-/*- Writes c, converted to an unsigned char, into the compressed file.- gzputc returns the value that was written, or -1 in case of error.-*/--ZEXTERN int ZEXPORT gzgetc OF((gzFile file));-/*- Reads one byte from the compressed file. gzgetc returns this byte- or -1 in case of end of file or error.-*/--ZEXTERN int ZEXPORT gzungetc OF((int c, gzFile file));-/*- Push one character back onto the stream to be read again later.- Only one character of push-back is allowed. gzungetc() returns the- character pushed, or -1 on failure. gzungetc() will fail if a- character has been pushed but not read yet, or if c is -1. The pushed- character will be discarded if the stream is repositioned with gzseek()- or gzrewind().-*/--ZEXTERN int ZEXPORT gzflush OF((gzFile file, int flush));-/*- Flushes all pending output into the compressed file. The parameter- flush is as in the deflate() function. The return value is the zlib- error number (see function gzerror below). gzflush returns Z_OK if- the flush parameter is Z_FINISH and all output could be flushed.- gzflush should be called only when strictly necessary because it can- degrade compression.-*/--ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile file,- z_off_t offset, int whence));-/*- Sets the starting position for the next gzread or gzwrite on the- given compressed file. The offset represents a number of bytes in the- uncompressed data stream. The whence parameter is defined as in lseek(2);- the value SEEK_END is not supported.- If the file is opened for reading, this function is emulated but can be- extremely slow. If the file is opened for writing, only forward seeks are- supported; gzseek then compresses a sequence of zeroes up to the new- starting position.-- gzseek returns the resulting offset location as measured in bytes from- the beginning of the uncompressed stream, or -1 in case of error, in- particular if the file is opened for writing and the new starting position- would be before the current position.-*/--ZEXTERN int ZEXPORT gzrewind OF((gzFile file));-/*- Rewinds the given file. This function is supported only for reading.-- gzrewind(file) is equivalent to (int)gzseek(file, 0L, SEEK_SET)-*/--ZEXTERN z_off_t ZEXPORT gztell OF((gzFile file));-/*- Returns the starting position for the next gzread or gzwrite on the- given compressed file. This position represents a number of bytes in the- uncompressed data stream.-- gztell(file) is equivalent to gzseek(file, 0L, SEEK_CUR)-*/--ZEXTERN int ZEXPORT gzeof OF((gzFile file));-/*- Returns 1 when EOF has previously been detected reading the given- input stream, otherwise zero.-*/--ZEXTERN int ZEXPORT gzdirect OF((gzFile file));-/*- Returns 1 if file is being read directly without decompression, otherwise- zero.-*/--ZEXTERN int ZEXPORT gzclose OF((gzFile file));-/*- Flushes all pending output if necessary, closes the compressed file- and deallocates all the (de)compression state. The return value is the zlib- error number (see function gzerror below).-*/--ZEXTERN const char * ZEXPORT gzerror OF((gzFile file, int *errnum));-/*- Returns the error message for the last error which occurred on the- given compressed file. errnum is set to zlib error number. If an- error occurred in the file system and not in the compression library,- errnum is set to Z_ERRNO and the application may consult errno- to get the exact error code.-*/--ZEXTERN void ZEXPORT gzclearerr OF((gzFile file));-/*- Clears the error and end-of-file flags for file. This is analogous to the- clearerr() function in stdio. This is useful for continuing to read a gzip- file that is being written concurrently.-*/-- /* checksum functions */--/*- These functions are not related to compression but are exported- anyway because they might be useful in applications using the- compression library.-*/--ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len));-/*- Update a running Adler-32 checksum with the bytes buf[0..len-1] and- return the updated checksum. If buf is NULL, this function returns- the required initial value for the checksum.- An Adler-32 checksum is almost as reliable as a CRC32 but can be computed- much faster. Usage example:-- uLong adler = adler32(0L, Z_NULL, 0);-- while (read_buffer(buffer, length) != EOF) {- adler = adler32(adler, buffer, length);- }- if (adler != original_adler) error();-*/--ZEXTERN uLong ZEXPORT adler32_combine OF((uLong adler1, uLong adler2,- z_off_t len2));-/*- Combine two Adler-32 checksums into one. For two sequences of bytes, seq1- and seq2 with lengths len1 and len2, Adler-32 checksums were calculated for- each, adler1 and adler2. adler32_combine() returns the Adler-32 checksum of- seq1 and seq2 concatenated, requiring only adler1, adler2, and len2.-*/--ZEXTERN uLong ZEXPORT crc32 OF((uLong crc, const Bytef *buf, uInt len));-/*- Update a running CRC-32 with the bytes buf[0..len-1] and return the- updated CRC-32. If buf is NULL, this function returns the required initial- value for the for the crc. Pre- and post-conditioning (one's complement) is- performed within this function so it shouldn't be done by the application.- Usage example:-- uLong crc = crc32(0L, Z_NULL, 0);-- while (read_buffer(buffer, length) != EOF) {- crc = crc32(crc, buffer, length);- }- if (crc != original_crc) error();-*/--ZEXTERN uLong ZEXPORT crc32_combine OF((uLong crc1, uLong crc2, z_off_t len2));--/*- Combine two CRC-32 check values into one. For two sequences of bytes,- seq1 and seq2 with lengths len1 and len2, CRC-32 check values were- calculated for each, crc1 and crc2. crc32_combine() returns the CRC-32- check value of seq1 and seq2 concatenated, requiring only crc1, crc2, and- len2.-*/--- /* various hacks, don't look :) */--/* deflateInit and inflateInit are macros to allow checking the zlib version- * and the compiler's view of z_stream:- */-ZEXTERN int ZEXPORT deflateInit_ OF((z_streamp strm, int level,- const char *version, int stream_size));-ZEXTERN int ZEXPORT inflateInit_ OF((z_streamp strm,- const char *version, int stream_size));-ZEXTERN int ZEXPORT deflateInit2_ OF((z_streamp strm, int level, int method,- int windowBits, int memLevel,- int strategy, const char *version,- int stream_size));-ZEXTERN int ZEXPORT inflateInit2_ OF((z_streamp strm, int windowBits,- const char *version, int stream_size));-ZEXTERN int ZEXPORT inflateBackInit_ OF((z_streamp strm, int windowBits,- unsigned char FAR *window,- const char *version,- int stream_size));-#define deflateInit(strm, level) \- deflateInit_((strm), (level), ZLIB_VERSION, sizeof(z_stream))-#define inflateInit(strm) \- inflateInit_((strm), ZLIB_VERSION, sizeof(z_stream))-#define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \- deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\- (strategy), ZLIB_VERSION, sizeof(z_stream))-#define inflateInit2(strm, windowBits) \- inflateInit2_((strm), (windowBits), ZLIB_VERSION, sizeof(z_stream))-#define inflateBackInit(strm, windowBits, window) \- inflateBackInit_((strm), (windowBits), (window), \- ZLIB_VERSION, sizeof(z_stream))---#if !defined(ZUTIL_H) && !defined(NO_DUMMY_DECL)- struct internal_state {int dummy;}; /* hack for buggy compilers */-#endif--ZEXTERN const char * ZEXPORT zError OF((int));-ZEXTERN int ZEXPORT inflateSyncPoint OF((z_streamp z));-ZEXTERN const uLongf * ZEXPORT get_crc_table OF((void));--#ifdef __cplusplus-}-#endif--#endif /* ZLIB_H */
digest.cabal view
@@ -1,5 +1,5 @@ name: digest-version: 0.0.0.4+version: 0.0.0.5 copyright: (c) 2008 Eugene Kirpichov license: BSD3 license-file: LICENSE@@ -34,6 +34,4 @@ if !os(windows) extra-libraries: z else- c-sources: cbits/adler32.c cbits/crc32.c- include-dirs: cbits- install-includes: zlib.h+ build-depends: zlib