mirror of
https://github.com/nillerusr/source-engine.git
synced 2024-12-23 06:36:54 +00:00
103 lines
3.2 KiB
C++
103 lines
3.2 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. ============//
|
|
//
|
|
// LZMA Codec interface for engine.
|
|
//
|
|
// LZMA SDK 9.38 beta
|
|
// 2015-01-03 : Igor Pavlov : Public domain
|
|
// http://www.7-zip.org/
|
|
//
|
|
//========================================================================//
|
|
|
|
#ifndef _LZMADECODER_H
|
|
#define _LZMADECODER_H
|
|
#pragma once
|
|
|
|
// Thanks for the useful define namespacing, LZMA
|
|
#include "../../utils/lzma/C/7zVersion.h"
|
|
#define LZMA_SDK_VERSION_MAJOR MY_VER_MAJOR
|
|
#define LZMA_SDK_VERSION_MINOR MY_VER_MINOR
|
|
|
|
#if !defined( _X360 )
|
|
#define LZMA_ID (('A'<<24)|('M'<<16)|('Z'<<8)|('L'))
|
|
#else
|
|
#define LZMA_ID (('L'<<24)|('Z'<<16)|('M'<<8)|('A'))
|
|
#endif
|
|
|
|
// bind the buffer for correct identification
|
|
#pragma pack(1)
|
|
struct lzma_header_t
|
|
{
|
|
unsigned int id;
|
|
unsigned int actualSize; // always little endian
|
|
unsigned int lzmaSize; // always little endian
|
|
unsigned char properties[5];
|
|
};
|
|
#pragma pack()
|
|
|
|
class CLZMAStream;
|
|
|
|
class CLZMA
|
|
{
|
|
public:
|
|
static unsigned int Uncompress( unsigned char *pInput, unsigned char *pOutput );
|
|
static bool IsCompressed( unsigned char *pInput );
|
|
static unsigned int GetActualSize( unsigned char *pInput );
|
|
};
|
|
|
|
// For files besides the implementation, we forward declare a dummy struct. We can't unconditionally forward declare
|
|
// this because LzmaEnc.h typedefs this directly to an unnamed struct :-/
|
|
#ifndef CLzmaDec_t
|
|
struct _CLzmaDec_t;
|
|
#define CLzmaDec_t struct _CLzmaDec_t
|
|
#endif
|
|
|
|
class CLZMAStream
|
|
{
|
|
public:
|
|
CLZMAStream();
|
|
~CLZMAStream();
|
|
|
|
// Initialize a stream to read data from a LZMA style zip file, passing the original size from the zip headers.
|
|
// Streams with a source-engine style header (lzma_header_t) do not need an init call.
|
|
void InitZIPHeader( unsigned int nCompressedSize, unsigned int nOriginalSize );
|
|
|
|
// Attempt to read up to nMaxInputBytes from the compressed stream, writing up to nMaxOutputBytes to pOutput.
|
|
// Makes progress until blocked on input or output.
|
|
// Returns false if read stops due to an error or if called at EOF (GetExpectedBytesRemaining == 0)
|
|
bool Read( unsigned char *pInput, unsigned int nMaxInputBytes,
|
|
unsigned char *pOutput, unsigned int nMaxOutputBytes,
|
|
/* out */ unsigned int &nCompressedBytesRead, /* out */ unsigned int &nOutputBytesWritten );
|
|
|
|
// Get the expected uncompressed bytes yet to be read from this stream. Returns false if not yet known, such as
|
|
// before being fed the header.
|
|
bool GetExpectedBytesRemaining( /* out */ unsigned int &nBytesRemaining );
|
|
|
|
private:
|
|
enum eHeaderParse
|
|
{
|
|
eHeaderParse_OK,
|
|
eHeaderParse_Fail,
|
|
eHeaderParse_NeedMoreBytes
|
|
};
|
|
|
|
eHeaderParse TryParseHeader( unsigned char *pInput, unsigned int nBytesAvailable, /* out */ unsigned int &nBytesConsumed );
|
|
|
|
void FreeDecoderState();
|
|
bool CreateDecoderState( const unsigned char *pProperties );
|
|
|
|
// Init from a zip-embedded LZMA stream. Requires the original size be passed from zip headers.
|
|
CLzmaDec_t *m_pDecoderState;
|
|
|
|
unsigned int m_nActualSize;
|
|
unsigned int m_nActualBytesRead;
|
|
unsigned int m_nCompressedSize;
|
|
unsigned int m_nCompressedBytesRead;
|
|
|
|
// If we have read past the header
|
|
bool m_bParsedHeader : 1;
|
|
// If InitZIPHeader() was called. We're expecting a zip-style header and have size information.
|
|
bool m_bZIPStyleHeader : 1;
|
|
};
|
|
|
|
#endif
|