mirror of
https://github.com/opencv/opencv.git
synced 2024-12-12 07:09:12 +08:00
0de26fd78e
Zlib-ng is zlib replacement with optimizations for "next generation" systems. Its optimization may benifits image library decode and encode speed such as libpng. In our tests, if using zlib-ng and libpng combination on a x86_64 machine with AVX2, the time of `imdecode` amd `imencode` will drop 20% approximately. This patch enables zlib-ng's optimization if `CV_DISABLE_OPTIMIZATION` is OFF. Since Zlib-ng can dispatch intrinsics on the fly, port work is much easier. Related discussion: https://github.com/opencv/opencv/issues/22573
81 lines
2.9 KiB
C
81 lines
2.9 KiB
C
/* uncompr.c -- decompress a memory buffer
|
|
* Copyright (C) 1995-2003, 2010, 2014, 2016 Jean-loup Gailly, Mark Adler.
|
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
|
*/
|
|
|
|
#include "zbuild.h"
|
|
#include "zutil.h"
|
|
|
|
/* ===========================================================================
|
|
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 size of the decompressed data and *sourceLen is the number
|
|
of source bytes consumed. Upon return, source + *sourceLen points to the
|
|
first unused input byte.
|
|
|
|
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, including if the input data is
|
|
an incomplete zlib stream.
|
|
*/
|
|
int Z_EXPORT PREFIX(uncompress2)(unsigned char *dest, z_uintmax_t *destLen, const unsigned char *source, z_uintmax_t *sourceLen) {
|
|
PREFIX3(stream) stream;
|
|
int err;
|
|
const unsigned int max = (unsigned int)-1;
|
|
z_uintmax_t len, left;
|
|
unsigned char buf[1]; /* for detection of incomplete stream when *destLen == 0 */
|
|
|
|
len = *sourceLen;
|
|
if (*destLen) {
|
|
left = *destLen;
|
|
*destLen = 0;
|
|
} else {
|
|
left = 1;
|
|
dest = buf;
|
|
}
|
|
|
|
stream.next_in = (z_const unsigned char *)source;
|
|
stream.avail_in = 0;
|
|
stream.zalloc = NULL;
|
|
stream.zfree = NULL;
|
|
stream.opaque = NULL;
|
|
|
|
err = PREFIX(inflateInit)(&stream);
|
|
if (err != Z_OK) return err;
|
|
|
|
stream.next_out = dest;
|
|
stream.avail_out = 0;
|
|
|
|
do {
|
|
if (stream.avail_out == 0) {
|
|
stream.avail_out = left > (unsigned long)max ? max : (unsigned int)left;
|
|
left -= stream.avail_out;
|
|
}
|
|
if (stream.avail_in == 0) {
|
|
stream.avail_in = len > (unsigned long)max ? max : (unsigned int)len;
|
|
len -= stream.avail_in;
|
|
}
|
|
err = PREFIX(inflate)(&stream, Z_NO_FLUSH);
|
|
} while (err == Z_OK);
|
|
|
|
*sourceLen -= len + stream.avail_in;
|
|
if (dest != buf)
|
|
*destLen = (z_size_t)stream.total_out;
|
|
else if (stream.total_out && err == Z_BUF_ERROR)
|
|
left = 1;
|
|
|
|
PREFIX(inflateEnd)(&stream);
|
|
return err == Z_STREAM_END ? Z_OK :
|
|
err == Z_NEED_DICT ? Z_DATA_ERROR :
|
|
err == Z_BUF_ERROR && left + stream.avail_out ? Z_DATA_ERROR :
|
|
err;
|
|
}
|
|
|
|
int Z_EXPORT PREFIX(uncompress)(unsigned char *dest, z_uintmax_t *destLen, const unsigned char *source, z_uintmax_t sourceLen) {
|
|
return PREFIX(uncompress2)(dest, destLen, source, &sourceLen);
|
|
}
|