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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
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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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#include "zbuild.h"
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#include "zutil.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 Z_EXPORT PREFIX(uncompress2)(unsigned char *dest, z_uintmax_t *destLen, const unsigned char *source, z_uintmax_t *sourceLen) {
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PREFIX3(stream) stream;
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int err;
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const unsigned int max = (unsigned int)-1;
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z_uintmax_t len, left;
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unsigned char 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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} 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 unsigned char *)source;
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stream.avail_in = 0;
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stream.zalloc = NULL;
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stream.zfree = NULL;
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stream.opaque = NULL;
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err = PREFIX(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 > (unsigned long)max ? max : (unsigned int)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 > (unsigned long)max ? max : (unsigned int)len;
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len -= stream.avail_in;
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}
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err = PREFIX(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 = (z_size_t)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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PREFIX(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 Z_EXPORT PREFIX(uncompress)(unsigned char *dest, z_uintmax_t *destLen, const unsigned char *source, z_uintmax_t sourceLen) {
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return PREFIX(uncompress2)(dest, destLen, source, &sourceLen);
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}
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