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third_party
zlib
uncompr.c
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/* uncompr.c -- decompress a memory buffer
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* Copyright (C) 1995-2003, 2010, 2014, 2016 Jean-loup Gailly, Mark Adler
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* For conditions of distribution and use, see copyright notice in zlib.h
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*/
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/* @(#) $Id$ */
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#define ZLIB_INTERNAL
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#include "
zlib.h
"
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/* ===========================================================================
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Decompresses the source buffer into the destination buffer. *sourceLen is
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the byte length of the source buffer. Upon entry, *destLen is the total size
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of the destination buffer, which must be large enough to hold the entire
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uncompressed data. (The size of the uncompressed data must have been saved
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previously by the compressor and transmitted to the decompressor by some
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mechanism outside the scope of this compression library.) Upon exit,
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*destLen is the size of the decompressed data and *sourceLen is the number
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of source bytes consumed. Upon return, source + *sourceLen points to the
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first unused input byte.
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uncompress returns Z_OK if success, Z_MEM_ERROR if there was not enough
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memory, Z_BUF_ERROR if there was not enough room in the output buffer, or
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Z_DATA_ERROR if the input data was corrupted, including if the input data is
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an incomplete zlib stream.
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*/
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int
ZEXPORT
uncompress2
(dest, destLen, source, sourceLen)
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Bytef
*dest;
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uLongf
*destLen;
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const
Bytef
*source;
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uLong
*sourceLen;
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{
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z_stream
stream;
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int
err;
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const
uInt
max = (
uInt
)-1;
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uLong
len, left;
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Byte
buf[1];
/* for detection of incomplete stream when *destLen == 0 */
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len = *sourceLen;
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if
(*destLen) {
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left = *destLen;
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*destLen = 0;
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}
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else
{
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left = 1;
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dest = buf;
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}
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stream.
next_in
= (
z_const
Bytef
*)source;
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stream.
avail_in
= 0;
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stream.
zalloc
= (alloc_func)0;
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stream.
zfree
= (free_func)0;
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stream.
opaque
= (
voidpf
)0;
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err =
inflateInit
(&stream);
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if
(err !=
Z_OK
)
return
err;
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stream.
next_out
= dest;
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stream.
avail_out
= 0;
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do
{
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if
(stream.
avail_out
== 0) {
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stream.
avail_out
= left > (
uLong
)max ? max : (
uInt
)left;
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left -= stream.
avail_out
;
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}
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if
(stream.
avail_in
== 0) {
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stream.
avail_in
= len > (
uLong
)max ? max : (
uInt
)len;
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len -= stream.
avail_in
;
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}
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err =
inflate
(&stream,
Z_NO_FLUSH
);
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}
while
(err ==
Z_OK
);
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*sourceLen -= len + stream.
avail_in
;
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if
(dest != buf)
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*destLen = stream.
total_out
;
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else
if
(stream.
total_out
&& err ==
Z_BUF_ERROR
)
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left = 1;
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inflateEnd
(&stream);
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return
err ==
Z_STREAM_END
?
Z_OK
:
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err ==
Z_NEED_DICT
?
Z_DATA_ERROR
:
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err ==
Z_BUF_ERROR
&& left + stream.
avail_out
?
Z_DATA_ERROR
:
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err;
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}
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int
ZEXPORT
uncompress
(dest, destLen, source, sourceLen)
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Bytef
*dest;
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uLongf
*destLen;
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const
Bytef
*source;
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uLong
sourceLen;
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{
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return
uncompress2
(dest, destLen, source, &sourceLen);
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}
Bytef
Byte FAR Bytef
Definition:
zconf.h:400
Z_BUF_ERROR
#define Z_BUF_ERROR
Definition:
zlib.h:184
uLong
unsigned long uLong
Definition:
zconf.h:394
uncompress2
int ZEXPORT uncompress2(Bytef *dest, uLongf *destLen, const Bytef *source, uLong *sourceLen)
Definition:
uncompr.c:27
z_stream_s::zfree
free_func zfree
Definition:
zlib.h:99
Z_DATA_ERROR
#define Z_DATA_ERROR
Definition:
zlib.h:182
z_stream_s::avail_in
uInt avail_in
Definition:
zlib.h:88
Z_NEED_DICT
#define Z_NEED_DICT
Definition:
zlib.h:179
uncompress
int ZEXPORT uncompress(Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen)
Definition:
uncompr.c:86
inflateInit
#define inflateInit(strm)
Definition:
zlib.h:1795
voidpf
Byte FAR * voidpf
Definition:
zconf.h:413
z_stream_s::avail_out
uInt avail_out
Definition:
zlib.h:92
Byte
unsigned char Byte
Definition:
zconf.h:391
z_const
#define z_const
Definition:
zconf.h:237
Z_NO_FLUSH
#define Z_NO_FLUSH
Definition:
zlib.h:168
Z_OK
#define Z_OK
Definition:
zlib.h:177
z_stream_s::zalloc
alloc_func zalloc
Definition:
zlib.h:98
uLongf
uLong FAR uLongf
Definition:
zconf.h:405
Z_STREAM_END
#define Z_STREAM_END
Definition:
zlib.h:178
z_stream_s
Definition:
zlib.h:86
z_stream_s::next_in
z_const Bytef * next_in
Definition:
zlib.h:87
z_stream_s::next_out
Bytef * next_out
Definition:
zlib.h:91
ZEXPORT
#define ZEXPORT
Definition:
zconf.h:380
uInt
unsigned int uInt
Definition:
zconf.h:393
inflateEnd
int ZEXPORT inflateEnd(z_streamp strm)
Definition:
inflate.c:1277
z_stream_s::opaque
voidpf opaque
Definition:
zlib.h:100
inflate
int ZEXPORT inflate(z_streamp strm, int flush)
Definition:
inflate.c:622
z_stream_s::total_out
uLong total_out
Definition:
zlib.h:93
zlib.h
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