61 lines
1.9 KiB
C++
61 lines
1.9 KiB
C++
// File: crn_lzma_codec.h
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// See Copyright Notice and license at the end of inc/crnlib.h
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#pragma once
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#include "crn_packed_uint.h"
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namespace crnlib
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{
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class lzma_codec
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{
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public:
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lzma_codec();
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~lzma_codec();
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// Always available, because we're statically linking in lzmalib now vs. dynamically loading the DLL.
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bool is_initialized() const { return true; }
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bool pack(const void* p, uint n, crnlib::vector<uint8>& buf);
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bool unpack(const void* p, uint n, crnlib::vector<uint8>& buf);
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private:
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typedef int (CRNLIB_STDCALL *LzmaCompressFuncPtr)(unsigned char *dest, size_t *destLen, const unsigned char *src, size_t srcLen,
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unsigned char *outProps, size_t *outPropsSize, /* *outPropsSize must be = 5 */
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int level, /* 0 <= level <= 9, default = 5 */
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unsigned dictSize, /* default = (1 << 24) */
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int lc, /* 0 <= lc <= 8, default = 3 */
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int lp, /* 0 <= lp <= 4, default = 0 */
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int pb, /* 0 <= pb <= 4, default = 2 */
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int fb, /* 5 <= fb <= 273, default = 32 */
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int numThreads /* 1 or 2, default = 2 */
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);
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typedef int (CRNLIB_STDCALL *LzmaUncompressFuncPtr)(unsigned char *dest, size_t *destLen, const unsigned char *src, size_t *srcLen,
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const unsigned char *props, size_t propsSize);
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LzmaCompressFuncPtr m_pCompress;
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LzmaUncompressFuncPtr m_pUncompress;
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enum { cLZMAPropsSize = 5 };
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#pragma pack(push)
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#pragma pack(1)
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struct header
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{
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enum { cSig = 'L' | ('0' << 8), cChecksumSkipBytes = 3 };
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packed_uint<2> m_sig;
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uint8 m_checksum;
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uint8 m_lzma_props[cLZMAPropsSize];
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packed_uint<4> m_comp_size;
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packed_uint<4> m_uncomp_size;
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packed_uint<4> m_adler32;
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};
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#pragma pack(pop)
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};
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} // namespace crnlib
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