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https://github.com/DarkflameUniverse/DarkflameServer
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73 lines
2.3 KiB
C++
73 lines
2.3 KiB
C++
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#include "ZCompression.h"
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#include <zlib.h>
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namespace ZCompression
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{
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int32_t GetMaxCompressedLength(int32_t nLenSrc)
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{
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int32_t n16kBlocks = (nLenSrc + 16383) / 16384; // round up any fraction of a block
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return (nLenSrc + 6 + (n16kBlocks * 5));
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}
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int32_t Compress(const uint8_t* abSrc, int32_t nLenSrc, uint8_t* abDst, int32_t nLenDst)
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{
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z_stream zInfo = { 0 };
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zInfo.total_in = zInfo.avail_in = nLenSrc;
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zInfo.total_out = zInfo.avail_out = nLenDst;
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zInfo.next_in = const_cast<Bytef*>(abSrc);
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zInfo.next_out = abDst;
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int nErr, nRet = -1;
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nErr = deflateInit(&zInfo, Z_DEFAULT_COMPRESSION); // zlib function
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if (nErr == Z_OK) {
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nErr = deflate(&zInfo, Z_FINISH); // zlib function
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if (nErr == Z_STREAM_END) {
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nRet = zInfo.total_out;
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}
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}
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deflateEnd(&zInfo); // zlib function
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return(nRet);
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}
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int32_t Decompress(const uint8_t* abSrc, int32_t nLenSrc, uint8_t* abDst, int32_t nLenDst, int32_t& nErr)
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{
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// Get the size of the decompressed data
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z_stream zInfo = { 0 };
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zInfo.total_in = zInfo.avail_in = nLenSrc;
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zInfo.total_out = zInfo.avail_out = nLenDst;
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zInfo.next_in = const_cast<Bytef*>(abSrc);
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zInfo.next_out = abDst;
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int nRet = -1;
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nErr = inflateInit(&zInfo); // zlib function
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if (nErr == Z_OK) {
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nErr = inflate(&zInfo, Z_FINISH); // zlib function
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if (nErr == Z_STREAM_END) {
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nRet = zInfo.total_out;
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}
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}
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inflateEnd(&zInfo); // zlib function
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return(nRet);
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/*
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z_stream zInfo = { 0 };
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zInfo.total_in = zInfo.avail_in = nLenSrc;
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zInfo.total_out = zInfo.avail_out = nLenDst;
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zInfo.next_in = const_cast<Bytef*>(abSrc);
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zInfo.next_out = const_cast<Bytef*>(abDst);
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int nRet = -1;
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nErr = inflateInit(&zInfo); // zlib function
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if (nErr == Z_OK) {
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nErr = inflate(&zInfo, Z_FINISH); // zlib function
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if (nErr == Z_STREAM_END) {
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nRet = zInfo.total_out;
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}
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}
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inflateEnd(&zInfo); // zlib function
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return(nRet); // -1 or len of output
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*/
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}
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}
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