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zlib: Update to version 1.3.1.2 and use context in decompression

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yuanyuanxiang
2026-01-15 14:34:10 +01:00
parent 32f298bdfb
commit 38517e20f9
14 changed files with 341 additions and 208 deletions
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126
compress/zlib/zconf.h
View File

@@ -1,5 +1,5 @@
/* zconf.h -- configuration of the zlib compression library
* Copyright (C) 1995-2024 Jean-loup Gailly, Mark Adler
/* zconf.h -- configuration of the zlib compression library
* Copyright (C) 1995-2025 Jean-loup Gailly, Mark Adler
* For conditions of distribution and use, see copyright notice in zlib.h
*/
@@ -7,8 +7,11 @@
#ifndef ZCONF_H
#define ZCONF_H
/* #undef Z_PREFIX */
/* #undef Z_HAVE_UNISTD_H */
#define HAVE_STDARG_H 1
/* #undef HAVE_UNISTD_H */
ZCONF_H
/*
* If you *really* need a unique prefix for all types and library functions,
@@ -61,6 +64,7 @@
# define deflateSetDictionary z_deflateSetDictionary
# define deflateSetHeader z_deflateSetHeader
# define deflateTune z_deflateTune
# define deflateUsed z_deflateUsed
# define deflate_copyright z_deflate_copyright
# define get_crc_table z_get_crc_table
# ifndef Z_SOLO
@@ -236,27 +240,29 @@
# endif
#endif
#if defined(ZLIB_CONST) && !defined(z_const)
# define z_const const
#else
# define z_const
#ifndef z_const
# ifdef ZLIB_CONST
# define z_const const
# else
# define z_const
# endif
#endif
#ifdef Z_SOLO
# ifdef _WIN64
typedef unsigned long long z_size_t;
typedef unsigned long long z_size_t;
# else
typedef unsigned long z_size_t;
typedef unsigned long z_size_t;
# endif
#else
# define z_longlong long long
# if defined(NO_SIZE_T)
typedef unsigned NO_SIZE_T z_size_t;
typedef unsigned NO_SIZE_T z_size_t;
# elif defined(STDC)
# include <stddef.h>
typedef size_t z_size_t;
typedef size_t z_size_t;
# else
typedef unsigned long z_size_t;
typedef unsigned long z_size_t;
# endif
# undef z_longlong
#endif
@@ -292,7 +298,7 @@ typedef unsigned long z_size_t;
for small objects.
*/
/* Type declarations */
/* Type declarations */
#ifndef OF /* function prototypes */
# ifdef STDC
@@ -310,7 +316,7 @@ typedef unsigned long z_size_t;
*/
#ifdef SYS16BIT
# if defined(M_I86SM) || defined(M_I86MM)
/* MSC small or medium model */
/* MSC small or medium model */
# define SMALL_MEDIUM
# ifdef _MSC_VER
# define FAR _far
@@ -319,7 +325,7 @@ typedef unsigned long z_size_t;
# endif
# endif
# if (defined(__SMALL__) || defined(__MEDIUM__))
/* Turbo C small or medium model */
/* Turbo C small or medium model */
# define SMALL_MEDIUM
# ifdef __BORLANDC__
# define FAR _far
@@ -330,9 +336,9 @@ typedef unsigned long z_size_t;
#endif
#if defined(WINDOWS) || defined(WIN32)
/* If building or using zlib as a DLL, define ZLIB_DLL.
* This is not mandatory, but it offers a little performance increase.
*/
/* If building or using zlib as a DLL, define ZLIB_DLL.
* This is not mandatory, but it offers a little performance increase.
*/
# ifdef ZLIB_DLL
# if defined(WIN32) && (!defined(__BORLANDC__) || (__BORLANDC__ >= 0x500))
# ifdef ZLIB_INTERNAL
@@ -342,10 +348,10 @@ typedef unsigned long z_size_t;
# endif
# endif
# endif /* ZLIB_DLL */
/* If building or using zlib with the WINAPI/WINAPIV calling convention,
* define ZLIB_WINAPI.
* Caution: the standard ZLIB1.DLL is NOT compiled using ZLIB_WINAPI.
*/
/* If building or using zlib with the WINAPI/WINAPIV calling convention,
* define ZLIB_WINAPI.
* Caution: the standard ZLIB1.DLL is NOT compiled using ZLIB_WINAPI.
*/
# ifdef ZLIB_WINAPI
# ifdef FAR
# undef FAR
@@ -354,8 +360,8 @@ typedef unsigned long z_size_t;
# define WIN32_LEAN_AND_MEAN
# endif
# include <windows.h>
/* No need for _export, use ZLIB.DEF instead. */
/* For complete Windows compatibility, use WINAPI, not __stdcall. */
/* No need for _export, use ZLIB.DEF instead. */
/* For complete Windows compatibility, use WINAPI, not __stdcall. */
# define ZEXPORT WINAPI
# ifdef WIN32
# define ZEXPORTVA WINAPIV
@@ -398,10 +404,10 @@ typedef unsigned int uInt; /* 16 bits or more */
typedef unsigned long uLong; /* 32 bits or more */
#ifdef SMALL_MEDIUM
/* Borland C/C++ and some old MSC versions ignore FAR inside typedef */
/* Borland C/C++ and some old MSC versions ignore FAR inside typedef */
# define Bytef Byte FAR
#else
typedef Byte FAR Bytef;
typedef Byte FAR Bytef;
#endif
typedef char FAR charf;
typedef int FAR intf;
@@ -409,13 +415,13 @@ typedef uInt FAR uIntf;
typedef uLong FAR uLongf;
#ifdef STDC
typedef void const *voidpc;
typedef void FAR *voidpf;
typedef void *voidp;
typedef void const *voidpc;
typedef void FAR *voidpf;
typedef void *voidp;
#else
typedef Byte const *voidpc;
typedef Byte FAR *voidpf;
typedef Byte *voidp;
typedef Byte const *voidpc;
typedef Byte FAR *voidpf;
typedef Byte *voidp;
#endif
#if !defined(Z_U4) && !defined(Z_SOLO) && defined(STDC)
@@ -430,16 +436,16 @@ typedef Byte *voidp;
#endif
#ifdef Z_U4
typedef Z_U4 z_crc_t;
typedef Z_U4 z_crc_t;
#else
typedef unsigned long z_crc_t;
typedef unsigned long z_crc_t;
#endif
#ifdef HAVE_UNISTD_H /* may be set to #if 1 by ./configure */
#if HAVE_UNISTD_H-0 /* may be set to #if 1 by ./configure */
# define Z_HAVE_UNISTD_H
#endif
#ifdef HAVE_STDARG_H /* may be set to #if 1 by ./configure */
#if HAVE_STDARG_H-0 /* may be set to #if 1 by ./configure */
# define Z_HAVE_STDARG_H
#endif
@@ -472,12 +478,8 @@ typedef unsigned long z_crc_t;
#endif
#ifndef Z_HAVE_UNISTD_H
# ifdef __WATCOMC__
# define Z_HAVE_UNISTD_H
# endif
#endif
#ifndef Z_HAVE_UNISTD_H
# if defined(_LARGEFILE64_SOURCE) && !defined(_WIN32)
# if defined(__WATCOMC__) || defined(__GO32__) || \
(defined(_LARGEFILE64_SOURCE) && !defined(_WIN32))
# define Z_HAVE_UNISTD_H
# endif
#endif
@@ -512,34 +514,36 @@ typedef unsigned long z_crc_t;
#endif
#ifndef z_off_t
# define z_off_t long
# define z_off_t long long
#endif
#if !defined(_WIN32) && defined(Z_LARGE64)
# define z_off64_t off64_t
#elif defined(__MINGW32__)
# define z_off64_t long long
#elif defined(_WIN32) && !defined(__GNUC__)
# define z_off64_t __int64
#elif defined(__GO32__)
# define z_off64_t offset_t
#else
# if defined(_WIN32) && !defined(__GNUC__)
# define z_off64_t __int64
# else
# define z_off64_t z_off_t
# endif
# define z_off64_t z_off_t
#endif
/* MVS linker does not support external names larger than 8 bytes */
#if defined(__MVS__)
#pragma map(deflateInit_,"DEIN")
#pragma map(deflateInit2_,"DEIN2")
#pragma map(deflateEnd,"DEEND")
#pragma map(deflateBound,"DEBND")
#pragma map(inflateInit_,"ININ")
#pragma map(inflateInit2_,"ININ2")
#pragma map(inflateEnd,"INEND")
#pragma map(inflateSync,"INSY")
#pragma map(inflateSetDictionary,"INSEDI")
#pragma map(compressBound,"CMBND")
#pragma map(inflate_table,"INTABL")
#pragma map(inflate_fast,"INFA")
#pragma map(inflate_copyright,"INCOPY")
#pragma map(deflateInit_,"DEIN")
#pragma map(deflateInit2_,"DEIN2")
#pragma map(deflateEnd,"DEEND")
#pragma map(deflateBound,"DEBND")
#pragma map(inflateInit_,"ININ")
#pragma map(inflateInit2_,"ININ2")
#pragma map(inflateEnd,"INEND")
#pragma map(inflateSync,"INSY")
#pragma map(inflateSetDictionary,"INSEDI")
#pragma map(compressBound,"CMBND")
#pragma map(inflate_table,"INTABL")
#pragma map(inflate_fast,"INFA")
#pragma map(inflate_copyright,"INCOPY")
#endif
#endif /* ZCONF_H */

314
compress/zlib/zlib.h
View File

@@ -1,7 +1,7 @@
/* zlib.h -- interface of the 'zlib' general purpose compression library
version 1.3.1, January 22nd, 2024
/* zlib.h -- interface of the 'zlib' general purpose compression library
version 1.3.1.2, December 8th, 2025
Copyright (C) 1995-2024 Jean-loup Gailly and Mark Adler
Copyright (C) 1995-2025 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
@@ -24,25 +24,29 @@
The data format used by the zlib library is described by RFCs (Request for
Comments) 1950 to 1952 in the files http://tools.ietf.org/html/rfc1950
Comments) 1950 to 1952 at https://datatracker.ietf.org/doc/html/rfc1950
(zlib format), rfc1951 (deflate format) and rfc1952 (gzip format).
*/
#ifndef ZLIB_H
#define ZLIB_H
#include "zconf.h"
#ifdef ZLIB_BUILD
# include <zconf.h>
#else
# include "zconf.h"
#endif
#ifdef __cplusplus
extern "C" {
#endif
#define ZLIB_VERSION "1.3.1"
#define ZLIB_VERNUM 0x1310
#define ZLIB_VERSION "1.3.1.2-audit"
#define ZLIB_VERNUM 0x1312
#define ZLIB_VER_MAJOR 1
#define ZLIB_VER_MINOR 3
#define ZLIB_VER_REVISION 1
#define ZLIB_VER_SUBREVISION 0
#define ZLIB_VER_SUBREVISION 2
/*
The 'zlib' compression library provides in-memory compression and
@@ -163,7 +167,7 @@ typedef gz_header FAR *gz_headerp;
if the decompressor wants to decompress everything in a single step).
*/
/* constants */
/* constants */
#define Z_NO_FLUSH 0
#define Z_PARTIAL_FLUSH 1
@@ -215,7 +219,7 @@ typedef gz_header FAR *gz_headerp;
/* for compatibility with versions < 1.0.2 */
/* basic functions */
/* basic functions */
ZEXTERN const char * ZEXPORT zlibVersion(void);
/* The application can compare zlibVersion and ZLIB_VERSION for consistency.
@@ -441,7 +445,7 @@ ZEXTERN int ZEXPORT inflate(z_streamp strm, int flush);
The Z_BLOCK option assists in appending to or combining deflate streams.
To assist in this, on return inflate() always sets strm->data_type to the
number of unused bits in the last byte taken from strm->next_in, plus 64 if
number of unused bits in the input 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
@@ -529,7 +533,7 @@ ZEXTERN int ZEXPORT inflateEnd(z_streamp strm);
*/
/* Advanced functions */
/* Advanced functions */
/*
The following functions are needed only in some special applications.
@@ -587,18 +591,21 @@ ZEXTERN int ZEXPORT deflateInit2(z_streamp strm,
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_STRATEGY 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.
filter (or predictor), Z_RLE to limit match distances to one (run-length
encoding), or Z_HUFFMAN_ONLY to force Huffman encoding only (no string
matching). Filtered data consists mostly of small values with a somewhat
random distribution, as produced by the PNG filters. 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 than the
default; it is intermediate between Z_DEFAULT_STRATEGY and Z_HUFFMAN_ONLY.
Z_RLE is almost as fast as Z_HUFFMAN_ONLY, but should give better
compression for PNG image data than Huffman only. The degree of string
matching from most to none is: Z_DEFAULT_STRATEGY, Z_FILTERED, Z_RLE, then
Z_HUFFMAN_ONLY. The strategy parameter affects the compression ratio but
never the correctness of the compressed output, even if it is not set
optimally for the given data. Z_FIXED uses the default string matching, but
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 any parameter is invalid (such as an invalid
@@ -609,8 +616,8 @@ ZEXTERN int ZEXPORT deflateInit2(z_streamp strm,
*/
ZEXTERN int ZEXPORT deflateSetDictionary(z_streamp strm,
const Bytef *dictionary,
uInt dictLength);
const Bytef *dictionary,
uInt dictLength);
/*
Initializes the compression dictionary from the given byte sequence
without producing any compressed output. When using the zlib format, this
@@ -653,8 +660,8 @@ ZEXTERN int ZEXPORT deflateSetDictionary(z_streamp strm,
*/
ZEXTERN int ZEXPORT deflateGetDictionary(z_streamp strm,
Bytef *dictionary,
uInt *dictLength);
Bytef *dictionary,
uInt *dictLength);
/*
Returns the sliding dictionary being maintained by deflate. dictLength is
set to the number of bytes in the dictionary, and that many bytes are copied
@@ -788,6 +795,18 @@ ZEXTERN int ZEXPORT deflatePending(z_streamp strm,
stream state was inconsistent.
*/
ZEXTERN int ZEXPORT deflateUsed(z_streamp strm,
int *bits);
/*
deflateUsed() returns in *bits the most recent number of deflate bits used
in the last byte when flushing to a byte boundary. The result is in 1..8, or
0 if there has not yet been a flush. This helps determine the location of
the last bit of a deflate stream.
deflateUsed returns Z_OK if success, or Z_STREAM_ERROR if the source
stream state was inconsistent.
*/
ZEXTERN int ZEXPORT deflatePrime(z_streamp strm,
int bits,
int value);
@@ -886,8 +905,8 @@ ZEXTERN int ZEXPORT inflateInit2(z_streamp strm,
*/
ZEXTERN int ZEXPORT inflateSetDictionary(z_streamp strm,
const Bytef *dictionary,
uInt dictLength);
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,
@@ -909,8 +928,8 @@ ZEXTERN int ZEXPORT inflateSetDictionary(z_streamp strm,
*/
ZEXTERN int ZEXPORT inflateGetDictionary(z_streamp strm,
Bytef *dictionary,
uInt *dictLength);
Bytef *dictionary,
uInt *dictLength);
/*
Returns the sliding dictionary being maintained by inflate. dictLength is
set to the number of bytes in the dictionary, and that many bytes are copied
@@ -987,13 +1006,15 @@ ZEXTERN int ZEXPORT inflatePrime(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.
This function inserts bits in the inflate input stream. The intent is to
use inflatePrime() 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 be used with raw inflate, before the first
inflate() call, after inflateInit2() or inflateReset(). It can also be used
after an inflate() return indicates the end of a deflate block or header
when using Z_BLOCK. 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. The
other bits in value can be non-zero, and will be ignored.
If bits is negative, then the input stream bit buffer is emptied. Then
inflatePrime() can be called again to put bits in the buffer. This is used
@@ -1001,7 +1022,15 @@ ZEXTERN int ZEXPORT inflatePrime(z_streamp strm,
to feeding inflate codes.
inflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source
stream state was inconsistent.
stream state was inconsistent, or if bits is out of range. If inflate was
in the middle of processing a header, trailer, or stored block lengths, then
it is possible for there to be only eight bits available in the bit buffer.
In that case, bits > 8 is considered out of range. However, when used as
outlined above, there will always be 16 bits available in the buffer for
insertion. As noted in its documentation above, inflate records the number
of bits in the bit buffer on return in data_type. 32 minus that is the
number of bits available for insertion. inflatePrime does not update
data_type with the new number of bits in buffer.
*/
ZEXTERN long ZEXPORT inflateMark(z_streamp strm);
@@ -1047,20 +1076,22 @@ ZEXTERN int ZEXPORT inflateGetHeader(z_streamp strm,
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.
was valid if done is set to one.) The extra, name, and comment pointers
much each be either Z_NULL or point to space to store that information from
the header. If extra is not Z_NULL, then extra_max contains the maximum
number of bytes that can be written 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, including the terminating zero, are
written there. If comment is not Z_NULL, then up to comm_max characters,
including the terminating zero, are written there. The application can tell
that the name or comment did not fit in the provided space by the absence of
a terminating zero. If any of extra, name, or comment are not present in
the header, then that field's pointer is set to Z_NULL. This allows the use
of deflateSetHeader() with the returned structure to duplicate the header.
Note that if those fields initially pointed to allocated memory, then the
application will need to save them 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
@@ -1219,7 +1250,7 @@ ZEXTERN uLong ZEXPORT zlibCompileFlags(void);
#ifndef Z_SOLO
/* utility functions */
/* utility functions */
/*
The following utility functions are implemented on top of the basic
@@ -1293,7 +1324,7 @@ ZEXTERN int ZEXPORT uncompress2(Bytef *dest, uLongf *destLen,
source bytes consumed.
*/
/* gzip file access functions */
/* gzip file access functions */
/*
This library supports reading and writing files in gzip (.gz) format with
@@ -1314,13 +1345,17 @@ ZEXTERN gzFile ZEXPORT gzopen(const char *path, const char *mode);
'R' for run-length encoding as in "wb1R", or 'F' for fixed code compression
as in "wb9F". (See the description of deflateInit2 for more information
about the strategy parameter.) 'T' will request transparent writing or
appending with no compression and not using the gzip format.
appending with no compression and not using the gzip format. 'T' cannot be
used to force transparent reading. Transparent reading is automatically
performed if there is no gzip header at the start. Transparent reading can
be disabled with the 'G' option, which will instead return an error if there
is no gzip header. 'N' will open the file in non-blocking mode.
"a" can be used instead of "w" to request that the gzip stream that will
be written be appended to the file. "+" will result in an error, since
'a' can be used instead of 'w' to request that the gzip stream that will
be written be appended to the file. '+' will result in an error, since
reading and writing to the same gzip file is not supported. The addition of
"x" when writing will create the file exclusively, which fails if the file
already exists. On systems that support it, the addition of "e" when
'x' when writing will create the file exclusively, which fails if the file
already exists. On systems that support it, the addition of 'e' when
reading or writing will set the flag to close the file on an execve() call.
These functions, as well as gzip, will read and decode a sequence of gzip
@@ -1339,14 +1374,22 @@ ZEXTERN gzFile ZEXPORT gzopen(const char *path, const char *mode);
insufficient memory to allocate the gzFile state, or if an invalid mode was
specified (an 'r', 'w', or 'a' was not provided, or '+' was provided).
errno can be checked to determine if the reason gzopen failed was that the
file could not be opened.
file could not be opened. Note that if 'N' is in mode for non-blocking, the
open() itself can fail in order to not block. In that case gzopen() will
return NULL and errno will be EAGAIN or ENONBLOCK. The call to gzopen() can
then be re-tried. If the application would like to block on opening the
file, then it can use open() without O_NONBLOCK, and then gzdopen() with the
resulting file descriptor and 'N' in the mode, which will set it to non-
blocking.
*/
ZEXTERN gzFile ZEXPORT gzdopen(int fd, const char *mode);
/*
Associate a gzFile with the file descriptor fd. File descriptors are
obtained from calls like open, dup, creat, pipe or fileno (if the file has
been previously opened with fopen). The mode parameter is as in gzopen.
been previously opened with fopen). The mode parameter is as in gzopen. An
'e' in mode will set fd's flag to close the file on an execve() call. An 'N'
in mode will set fd's non-blocking flag.
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
@@ -1416,10 +1459,16 @@ ZEXTERN int ZEXPORT gzread(gzFile file, voidp buf, unsigned len);
stream. Alternatively, gzerror can be used before gzclose to detect this
case.
gzread can be used to read a gzip file on a non-blocking device. If the
input stalls and there is no uncompressed data to return, then gzread() will
return -1, and errno will be EAGAIN or EWOULDBLOCK. gzread() can then be
called again.
gzread returns the number of uncompressed bytes actually read, less than
len for end of file, or -1 for error. If len is too large to fit in an int,
then nothing is read, -1 is returned, and the error state is set to
Z_STREAM_ERROR.
Z_STREAM_ERROR. If some data was read before an error, then that data is
returned until exhausted, after which the next call will signal the error.
*/
ZEXTERN z_size_t ZEXPORT gzfread(voidp buf, z_size_t size, z_size_t nitems,
@@ -1443,15 +1492,20 @@ ZEXTERN z_size_t ZEXPORT gzfread(voidp buf, z_size_t size, z_size_t nitems,
multiple of size, then the final partial item is nevertheless read into buf
and the end-of-file flag is set. The length of the partial item read is not
provided, but could be inferred from the result of gztell(). This behavior
is the same as the behavior of fread() implementations in common libraries,
but it prevents the direct use of gzfread() to read a concurrently written
file, resetting and retrying on end-of-file, when size is not 1.
is the same as that of fread() implementations in common libraries. This
could result in data loss if used with size != 1 when reading a concurrently
written file or a non-blocking file. In that case, use size == 1 or gzread()
instead.
*/
ZEXTERN int ZEXPORT gzwrite(gzFile file, voidpc buf, unsigned len);
/*
Compress and write the len uncompressed bytes at buf to file. gzwrite
returns the number of uncompressed bytes written or 0 in case of error.
returns the number of uncompressed bytes written, or 0 in case of error or
if len is 0. If the write destination is non-blocking, then gzwrite() may
return a number of bytes written that is not 0 and less than len.
If len does not fit in an int, then 0 is returned and nothing is written.
*/
ZEXTERN z_size_t ZEXPORT gzfwrite(voidpc buf, z_size_t size,
@@ -1466,6 +1520,11 @@ ZEXTERN z_size_t ZEXPORT gzfwrite(voidpc buf, z_size_t size,
if there was an error. If the multiplication of size and nitems overflows,
i.e. the product does not fit in a z_size_t, then nothing is written, zero
is returned, and the error state is set to Z_STREAM_ERROR.
If writing a concurrently read file or a non-blocking file with size != 1,
a partial item could be written, with no way of knowing how much of it was
not written, resulting in data loss. In that case, use size == 1 or
gzwrite() instead.
*/
ZEXTERN int ZEXPORTVA gzprintf(gzFile file, const char *format, ...);
@@ -1481,6 +1540,9 @@ ZEXTERN int ZEXPORTVA gzprintf(gzFile file, const char *format, ...);
zlib was compiled with the insecure functions sprintf() or vsprintf(),
because the secure snprintf() or vsnprintf() functions were not available.
This can be determined using zlibCompileFlags().
If a Z_BUF_ERROR is returned, then nothing was written due to a stall on
the non-blocking write destination.
*/
ZEXTERN int ZEXPORT gzputs(gzFile file, const char *s);
@@ -1489,6 +1551,11 @@ ZEXTERN int ZEXPORT gzputs(gzFile file, const char *s);
the terminating null character.
gzputs returns the number of characters written, or -1 in case of error.
The number of characters written may be less than the length of the string
if the write destination is non-blocking.
If the length of the string does not fit in an int, then -1 is returned
and nothing is written.
*/
ZEXTERN char * ZEXPORT gzgets(gzFile file, char *buf, int len);
@@ -1501,8 +1568,13 @@ ZEXTERN char * ZEXPORT gzgets(gzFile file, char *buf, int len);
left untouched.
gzgets returns buf which is a null-terminated string, or it returns NULL
for end-of-file or in case of error. If there was an error, the contents at
buf are indeterminate.
for end-of-file or in case of error. If some data was read before an error,
then that data is returned until exhausted, after which the next call will
return NULL to signal the error.
gzgets can be used on a file being concurrently written, and on a non-
blocking device, both as for gzread(). However lines may be broken in the
middle, leaving it up to the application to reassemble them as needed.
*/
ZEXTERN int ZEXPORT gzputc(gzFile file, int c);
@@ -1513,11 +1585,19 @@ ZEXTERN int ZEXPORT gzputc(gzFile file, int c);
ZEXTERN int ZEXPORT gzgetc(gzFile file);
/*
Read and decompress one byte from file. gzgetc returns this byte or -1
in case of end of file or error. This is implemented as a macro for speed.
As such, it does not do all of the checking the other functions do. I.e.
it does not check to see if file is NULL, nor whether the structure file
points to has been clobbered or not.
Read and decompress one byte from file. gzgetc returns this byte or -1 in
case of end of file or error. If some data was read before an error, then
that data is returned until exhausted, after which the next call will return
-1 to signal the error.
This is implemented as a macro for speed. As such, it does not do all of
the checking the other functions do. I.e. it does not check to see if file
is NULL, nor whether the structure file points to has been clobbered or not.
gzgetc can be used to read a gzip file on a non-blocking device. If the
input stalls and there is no uncompressed data to return, then gzgetc() will
return -1, and errno will be EAGAIN or EWOULDBLOCK. gzread() can then be
called again.
*/
ZEXTERN int ZEXPORT gzungetc(int c, gzFile file);
@@ -1530,6 +1610,11 @@ ZEXTERN int ZEXPORT gzungetc(int c, gzFile file);
output buffer size of pushed characters is allowed. (See gzbuffer above.)
The pushed character will be discarded if the stream is repositioned with
gzseek() or gzrewind().
gzungetc(-1, file) will force any pending seek to execute. Then gztell()
will report the position, even if the requested seek reached end of file.
This can be used to determine the number of uncompressed bytes in a gzip
file without having to read it into a buffer.
*/
ZEXTERN int ZEXPORT gzflush(gzFile file, int flush);
@@ -1559,7 +1644,8 @@ ZEXTERN z_off_t ZEXPORT gzseek(gzFile file,
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.
starting position. For reading or writing, any actual seeking is deferred
until the next read or write operation, or close operation when writing.
gzseek returns the resulting offset location as measured in bytes from
the beginning of the uncompressed stream, or -1 in case of error, in
@@ -1567,7 +1653,7 @@ ZEXTERN z_off_t ZEXPORT gzseek(gzFile file,
would be before the current position.
*/
ZEXTERN int ZEXPORT gzrewind(gzFile file);
ZEXTERN int ZEXPORT gzrewind(gzFile file);
/*
Rewind file. This function is supported only for reading.
@@ -1575,7 +1661,7 @@ ZEXTERN int ZEXPORT gzrewind(gzFile file);
*/
/*
ZEXTERN z_off_t ZEXPORT gztell(gzFile file);
ZEXTERN z_off_t ZEXPORT gztell(gzFile file);
Return the starting position for the next gzread or gzwrite on file.
This position represents a number of bytes in the uncompressed data stream,
@@ -1620,8 +1706,11 @@ ZEXTERN int ZEXPORT gzdirect(gzFile file);
If gzdirect() is used immediately after gzopen() or gzdopen() it will
cause buffers to be allocated to allow reading the file to determine if it
is a gzip file. Therefore if gzbuffer() is used, it should be called before
gzdirect().
is a gzip file. Therefore if gzbuffer() is used, it should be called before
gzdirect(). If the input is being written concurrently or the device is non-
blocking, then gzdirect() may give a different answer once four bytes of
input have been accumulated, which is what is needed to confirm or deny a
gzip header. Before this, gzdirect() will return true (1).
When writing, gzdirect() returns true (1) if transparent writing was
requested ("wT" for the gzopen() mode), or false (0) otherwise. (Note:
@@ -1631,7 +1720,7 @@ ZEXTERN int ZEXPORT gzdirect(gzFile file);
gzip file reading and decompression, which may not be desired.)
*/
ZEXTERN int ZEXPORT gzclose(gzFile file);
ZEXTERN int ZEXPORT gzclose(gzFile file);
/*
Flush all pending output for file, if necessary, close file and
deallocate the (de)compression state. Note that once file is closed, you
@@ -1659,9 +1748,10 @@ ZEXTERN int ZEXPORT gzclose_w(gzFile file);
ZEXTERN const char * ZEXPORT gzerror(gzFile file, int *errnum);
/*
Return the error message for the last error which occurred on 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.
If errnum is not NULL, *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.
The application must not modify the returned string. Future calls to
this function may invalidate the previously returned string. If file is
@@ -1681,7 +1771,7 @@ ZEXTERN void ZEXPORT gzclearerr(gzFile file);
#endif /* !Z_SOLO */
/* checksum functions */
/* checksum functions */
/*
These functions are not related to compression but are exported
@@ -1776,7 +1866,7 @@ ZEXTERN uLong ZEXPORT crc32_combine_op(uLong crc1, uLong crc2, uLong op);
*/
/* various hacks, don't look :) */
/* various hacks, don't look :) */
/* deflateInit and inflateInit are macros to allow checking the zlib version
* and the compiler's view of z_stream:
@@ -1856,13 +1946,13 @@ ZEXTERN int ZEXPORT gzgetc_(gzFile file); /* backward compatibility */
* without large file support, _LFS64_LARGEFILE must also be true
*/
#ifdef Z_LARGE64
ZEXTERN gzFile ZEXPORT gzopen64(const char *, const char *);
ZEXTERN z_off64_t ZEXPORT gzseek64(gzFile, z_off64_t, int);
ZEXTERN z_off64_t ZEXPORT gztell64(gzFile);
ZEXTERN z_off64_t ZEXPORT gzoffset64(gzFile);
ZEXTERN uLong ZEXPORT adler32_combine64(uLong, uLong, z_off64_t);
ZEXTERN uLong ZEXPORT crc32_combine64(uLong, uLong, z_off64_t);
ZEXTERN uLong ZEXPORT crc32_combine_gen64(z_off64_t);
ZEXTERN gzFile ZEXPORT gzopen64(const char *, const char *);
ZEXTERN z_off64_t ZEXPORT gzseek64(gzFile, z_off64_t, int);
ZEXTERN z_off64_t ZEXPORT gztell64(gzFile);
ZEXTERN z_off64_t ZEXPORT gzoffset64(gzFile);
ZEXTERN uLong ZEXPORT adler32_combine64(uLong, uLong, z_off64_t);
ZEXTERN uLong ZEXPORT crc32_combine64(uLong, uLong, z_off64_t);
ZEXTERN uLong ZEXPORT crc32_combine_gen64(z_off64_t);
#endif
#if !defined(ZLIB_INTERNAL) && defined(Z_WANT64)
@@ -1884,29 +1974,29 @@ ZEXTERN uLong ZEXPORT crc32_combine_gen64(z_off64_t);
# define crc32_combine_gen crc32_combine_gen64
# endif
# ifndef Z_LARGE64
ZEXTERN gzFile ZEXPORT gzopen64(const char *, const char *);
ZEXTERN z_off_t ZEXPORT gzseek64(gzFile, z_off_t, int);
ZEXTERN z_off_t ZEXPORT gztell64(gzFile);
ZEXTERN z_off_t ZEXPORT gzoffset64(gzFile);
ZEXTERN uLong ZEXPORT adler32_combine64(uLong, uLong, z_off_t);
ZEXTERN uLong ZEXPORT crc32_combine64(uLong, uLong, z_off_t);
ZEXTERN uLong ZEXPORT crc32_combine_gen64(z_off_t);
ZEXTERN gzFile ZEXPORT gzopen64(const char *, const char *);
ZEXTERN z_off_t ZEXPORT gzseek64(gzFile, z_off_t, int);
ZEXTERN z_off_t ZEXPORT gztell64(gzFile);
ZEXTERN z_off_t ZEXPORT gzoffset64(gzFile);
ZEXTERN uLong ZEXPORT adler32_combine64(uLong, uLong, z_off64_t);
ZEXTERN uLong ZEXPORT crc32_combine64(uLong, uLong, z_off64_t);
ZEXTERN uLong ZEXPORT crc32_combine_gen64(z_off64_t);
# endif
#else
ZEXTERN gzFile ZEXPORT gzopen(const char *, const char *);
ZEXTERN z_off_t ZEXPORT gzseek(gzFile, z_off_t, int);
ZEXTERN z_off_t ZEXPORT gztell(gzFile);
ZEXTERN z_off_t ZEXPORT gzoffset(gzFile);
ZEXTERN uLong ZEXPORT adler32_combine(uLong, uLong, z_off_t);
ZEXTERN uLong ZEXPORT crc32_combine(uLong, uLong, z_off_t);
ZEXTERN uLong ZEXPORT crc32_combine_gen(z_off_t);
ZEXTERN gzFile ZEXPORT gzopen(const char *, const char *);
ZEXTERN z_off_t ZEXPORT gzseek(gzFile, z_off_t, int);
ZEXTERN z_off_t ZEXPORT gztell(gzFile);
ZEXTERN z_off_t ZEXPORT gzoffset(gzFile);
ZEXTERN uLong ZEXPORT adler32_combine(uLong, uLong, z_off_t);
ZEXTERN uLong ZEXPORT crc32_combine(uLong, uLong, z_off_t);
ZEXTERN uLong ZEXPORT crc32_combine_gen(z_off_t);
#endif
#else /* Z_SOLO */
ZEXTERN uLong ZEXPORT adler32_combine(uLong, uLong, z_off_t);
ZEXTERN uLong ZEXPORT crc32_combine(uLong, uLong, z_off_t);
ZEXTERN uLong ZEXPORT crc32_combine_gen(z_off_t);
ZEXTERN uLong ZEXPORT adler32_combine(uLong, uLong, z_off_t);
ZEXTERN uLong ZEXPORT crc32_combine(uLong, uLong, z_off_t);
ZEXTERN uLong ZEXPORT crc32_combine_gen(z_off_t);
#endif /* !Z_SOLO */
@@ -1926,8 +2016,8 @@ ZEXTERN gzFile ZEXPORT gzopen_w(const wchar_t *path,
#if defined(STDC) || defined(Z_HAVE_STDARG_H)
# ifndef Z_SOLO
ZEXTERN int ZEXPORTVA gzvprintf(gzFile file,
const char *format,
va_list va);
const char *format,
va_list va);
# endif
#endif

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