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author | Sakitoshi | 2019-01-23 21:51:34 -0300 |
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committer | GitHub | 2019-01-23 21:51:34 -0300 |
commit | e424c297b7b714cf2f25582cf9b4fc30cba5599f (patch) | |
tree | ea7e23977f5403d1c5ed3e18b27d03e53e778810 /deps/compress.c | |
parent | de95fedd6981b4608cb78180e3bddde7e675223c (diff) | |
parent | c8e850f3584ba1eea367373d76d8b768a58d6d2c (diff) | |
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Merge pull request #1 from libretro/master
catch up to libretro repo
Diffstat (limited to 'deps/compress.c')
-rw-r--r-- | deps/compress.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/deps/compress.c b/deps/compress.c new file mode 100644 index 0000000..48465bd --- /dev/null +++ b/deps/compress.c @@ -0,0 +1,70 @@ +/* compress.c -- compress a memory buffer + * Copyright (C) 1995-2005 Jean-loup Gailly. + * For conditions of distribution and use, see copyright notice in zlib.h + */ + +/* @(#) $Id$ */ + +#define ZLIB_INTERNAL +#include "zlib.h" + +/* =========================================================================== + 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 0.1% larger than sourceLen plus + 12 bytes. 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. + */ +int ZEXPORT compress2 (Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen, int level) +{ + z_stream stream; + int err; + + stream.next_in = (Bytef *)source; + stream.avail_in = (uInt)sourceLen; +#ifdef MAXSEG_64K + /* Check for source > 64K on 16-bit machine: */ + if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR; +#endif + stream.next_out = dest; + stream.avail_out = (uInt)*destLen; + if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR; + + stream.zalloc = Z_NULL; + stream.zfree = Z_NULL; + stream.opaque = (voidpf)0; + + err = deflateInit(&stream, level); + if (err != Z_OK) return err; + + err = deflate(&stream, Z_FINISH); + if (err != Z_STREAM_END) { + deflateEnd(&stream); + return err == Z_OK ? Z_BUF_ERROR : err; + } + *destLen = stream.total_out; + + err = deflateEnd(&stream); + return err; +} + +/* =========================================================================== +*/ +int ZEXPORT compress (Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen) +{ + return compress2(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION); +} + +/* =========================================================================== + If the default memLevel or windowBits for deflateInit() is changed, then + this function needs to be updated. + */ +uLong ZEXPORT compressBound (uLong sourceLen) +{ + return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) + + (sourceLen >> 25) + 13; +} |