mirror of https://github.com/PCSX2/pcsx2.git
132 lines
2.6 KiB
C++
132 lines
2.6 KiB
C++
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/* The file is based of zpipe.c + minor rename and minor adaptation
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*
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* zpipe.c: example of proper use of zlib's inflate() and deflate()
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* Not copyrighted -- provided to the public domain
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* Version 1.4 11 December 2005 Mark Adler
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*/
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#include <iostream>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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//#define ZLIB_WINAPI
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#include "zlib.h"
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int def(char *src, char *dst, int bytes_to_compress, int *bytes_after_compressed)
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{
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z_stream strm;
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int ret;
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unsigned have;
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/* allocate deflate state */
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strm.zalloc = Z_NULL;
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strm.zfree = Z_NULL;
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strm.opaque = Z_NULL;
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ret = deflateInit(&strm, Z_DEFAULT_COMPRESSION) ;
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if (ret != Z_OK)
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return ret;
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/* compress */
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strm.avail_in = bytes_to_compress ;
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strm.avail_out = bytes_to_compress ;
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strm.next_in = (Bytef *)src ;
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strm.next_out = (Bytef *)dst ;
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ret = deflate(&strm, Z_FINISH) ;
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have = bytes_to_compress - strm.avail_out ;
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*bytes_after_compressed = have ;
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assert(ret == Z_STREAM_END); /* stream will be complete */
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/* clean up and return */
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(void)deflateEnd(&strm);
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return Z_OK;
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}
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int inf(char *src, char *dst, int bytes_to_decompress, int maximum_after_decompress, int* outbytes)
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{
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z_stream strm;
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int ret;
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/* allocate inflate state */
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strm.zalloc = Z_NULL;
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strm.zfree = Z_NULL;
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strm.opaque = Z_NULL;
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strm.avail_in = 0;
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strm.next_in = Z_NULL;
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ret = inflateInit(&strm);
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if (ret != Z_OK) return ret;
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/* decompress */
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strm.avail_in = bytes_to_decompress ;
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strm.next_in = (Bytef *)src ;
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strm.next_out = (Bytef *)dst ;
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strm.avail_out = maximum_after_decompress ;
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ret = inflate(&strm, Z_NO_FLUSH) ;
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assert(ret != Z_STREAM_ERROR); /* state not clobbered */
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switch (ret)
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{
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case Z_NEED_DICT:
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ret = Z_DATA_ERROR; /* and fall through */
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case Z_DATA_ERROR:
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case Z_MEM_ERROR:
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(void)inflateEnd(&strm);
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return ret;
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}
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assert(strm.avail_in == 0); /* all input will be used */
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if (outbytes != NULL) *outbytes = strm.total_out;
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/* clean up and return */
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(void)inflateEnd(&strm);
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return ret == Z_STREAM_END ? Z_OK : Z_DATA_ERROR;
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}
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/* report a zlib or i/o error */
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void zerr(int ret)
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{
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fputs("zpipe: ", stderr);
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switch (ret)
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{
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case Z_ERRNO:
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if (ferror(stdin)) fputs("error reading stdin\n", stderr);
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if (ferror(stdout)) fputs("error writing stdout\n", stderr);
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break;
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case Z_STREAM_ERROR:
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fputs("invalid compression level\n", stderr);
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break;
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case Z_DATA_ERROR:
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fputs("invalid or incomplete deflate data\n", stderr);
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break;
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case Z_MEM_ERROR:
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fputs("out of memory\n", stderr);
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break;
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case Z_VERSION_ERROR:
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fputs("zlib version mismatch!\n", stderr);
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}
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}
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