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60 lines
1.5 KiB
C++
60 lines
1.5 KiB
C++
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#include "zlib.h"
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#include <string>
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#include <stdexcept>
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#include <zlib/zlib.h>
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#include <vector>
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namespace xivps3::utils::zlib
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{
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void compress( const std::vector< char >& in, std::vector< char >& out )
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{
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// Fetching upper bound for out size
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auto out_size = compressBound( in.size() );
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out.resize( out_size );
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auto ret = compress2( reinterpret_cast<uint8_t*>(out.data()), &out_size,
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reinterpret_cast<const uint8_t*>(in.data()), in.size(), Z_BEST_COMPRESSION );
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if( ret != Z_OK )
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{
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throw std::runtime_error( "Error at zlib uncompress: " + std::to_string( ret ) );
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}
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out.resize( out_size );
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}
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void no_header_decompress( uint8_t* in, size_t in_size, uint8_t* out, size_t out_size )
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{
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z_stream strm;
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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 = in_size;
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strm.next_in = Z_NULL;
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// Init with -15 because we do not have header in this compressed data
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auto ret = inflateInit2( &strm, -15 );
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if( ret != Z_OK )
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{
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throw std::runtime_error( "Error at zlib init: " + std::to_string( ret ) );
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}
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// Set pointers to the right addresses
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strm.next_in = in;
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strm.avail_out = out_size;
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strm.next_out = out;
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// Effectively decompress data
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ret = inflate( &strm, Z_NO_FLUSH );
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if( ret != Z_STREAM_END )
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{
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throw std::runtime_error( "Error at zlib inflate: " + std::to_string( ret ) );
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}
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// Clean up
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inflateEnd( &strm );
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}
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}
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