Add LZSS implementation to SDK

This commit is contained in:
Kawe Mazidjatari 2023-04-05 21:38:28 +02:00
parent 69775ca234
commit dbe1850ec1
10 changed files with 558 additions and 12 deletions

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@ -0,0 +1,4 @@
#ifndef MEMDBGON_H
#define MEMDBGON_H
#endif // MEMDBGON_H

71
r5dev/public/tier1/lzss.h Normal file
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@ -0,0 +1,71 @@
//========= Copyright © 1996-2007, Valve Corporation, All rights reserved. ============//
//
// LZSS Codec. Designed for fast cheap gametime encoding/decoding. Compression results
// are not aggresive as other alogrithms, but gets 2:1 on most arbitrary uncompressed data.
//
//=====================================================================================//
#ifndef _LZSS_H
#define _LZSS_H
#pragma once
#if defined( PLAT_LITTLE_ENDIAN )
#define LZSS_ID (('S'<<24)|('S'<<16)|('Z'<<8)|('L'))
#else
#define LZSS_ID (('L'<<24)|('Z'<<16)|('S'<<8)|('S'))
#endif
// bind the buffer for correct identification
struct lzss_header_t
{
unsigned int id;
unsigned int actualSize; // always little endian
};
class CUtlBuffer;
#define DEFAULT_LZSS_WINDOW_SIZE 4096
class CLZSS
{
public:
unsigned char* Compress( unsigned char *pInput, int inputlen, unsigned int *pOutputSize );
unsigned char* CompressNoAlloc( unsigned char *pInput, int inputlen, unsigned char *pOutput, unsigned int *pOutputSize );
unsigned int Uncompress( unsigned char *pInput, unsigned char *pOutput );
//unsigned int Uncompress( unsigned char *pInput, CUtlBuffer &buf );
unsigned int SafeUncompress( unsigned char *pInput, unsigned char *pOutput, unsigned int unBufSize );
bool IsCompressed( unsigned char *pInput );
unsigned int GetActualSize( unsigned char *pInput );
// windowsize must be a power of two.
FORCEINLINE CLZSS( int nWindowSize = DEFAULT_LZSS_WINDOW_SIZE );
private:
// expected to be sixteen bytes
struct lzss_node_t
{
unsigned char *pData;
lzss_node_t *pPrev;
lzss_node_t *pNext;
char empty[4];
};
struct lzss_list_t
{
lzss_node_t *pStart;
lzss_node_t *pEnd;
};
void BuildHash( unsigned char *pData );
lzss_list_t *m_pHashTable;
lzss_node_t *m_pHashTarget;
int m_nWindowSize;
};
FORCEINLINE CLZSS::CLZSS( int nWindowSize )
{
m_nWindowSize = nWindowSize;
}
#endif

425
r5dev/tier1/lzss.cpp Normal file
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@ -0,0 +1,425 @@
//========= Copyright © 1996-2007, Valve Corporation, All rights reserved. ============//
//
// LZSS Codec. Designed for fast cheap gametime encoding/decoding. Compression results
// are not aggresive as other alogrithms, but gets 2:1 on most arbitrary uncompressed data.
//
//=====================================================================================//
#include "core/stdafx.h"
#include "tier0/platform.h"
#include "tier0/dbg.h"
#include "tier1/lzss.h"
#include "tier1/utlbuffer.h"
#include "mathlib/swap.h"
#define LZSS_LOOKSHIFT 4
#define LZSS_LOOKAHEAD ( 1 << LZSS_LOOKSHIFT )
// memdbgon must be the last include file in a .cpp file!!!
#include "tier0/memdbgon.h"
//-----------------------------------------------------------------------------
// Returns true if buffer is compressed.
//-----------------------------------------------------------------------------
bool CLZSS::IsCompressed( unsigned char *pInput )
{
lzss_header_t *pHeader = (lzss_header_t *)pInput;
if ( pHeader && pHeader->id == LZSS_ID )
{
return true;
}
// unrecognized
return false;
}
//-----------------------------------------------------------------------------
// Returns uncompressed size of compressed input buffer. Used for allocating output
// buffer for decompression. Returns 0 if input buffer is not compressed.
//-----------------------------------------------------------------------------
unsigned int CLZSS::GetActualSize( unsigned char *pInput )
{
lzss_header_t *pHeader = (lzss_header_t *)pInput;
if ( pHeader && pHeader->id == LZSS_ID )
{
return LittleLong( pHeader->actualSize );
}
// unrecognized
return 0;
}
void CLZSS::BuildHash( unsigned char *pData )
{
lzss_list_t *pList;
lzss_node_t *pTarget;
int targetindex = (unsigned int)( uintp( pData ) & 0xFFFFFFFF ) & ( m_nWindowSize - 1 );
pTarget = &m_pHashTarget[targetindex];
if ( pTarget->pData )
{
pList = &m_pHashTable[*pTarget->pData];
if ( pTarget->pPrev )
{
pList->pEnd = pTarget->pPrev;
pTarget->pPrev->pNext = 0;
}
else
{
pList->pEnd = 0;
pList->pStart = 0;
}
}
pList = &m_pHashTable[*pData];
pTarget->pData = pData;
pTarget->pPrev = 0;
pTarget->pNext = pList->pStart;
if ( pList->pStart )
{
pList->pStart->pPrev = pTarget;
}
else
{
pList->pEnd = pTarget;
}
pList->pStart = pTarget;
}
unsigned char *CLZSS::CompressNoAlloc( unsigned char *pInput, int inputLength, unsigned char *pOutputBuf, unsigned int *pOutputSize )
{
if ( inputLength <= sizeof( lzss_header_t ) + 8 )
{
return NULL;
}
// create the compression work buffers, small enough (~64K) for stack
m_pHashTable = (lzss_list_t *)stackalloc( 256 * sizeof( lzss_list_t ) );
memset( m_pHashTable, 0, 256 * sizeof( lzss_list_t ) );
m_pHashTarget = (lzss_node_t *)stackalloc( m_nWindowSize * sizeof( lzss_node_t ) );
memset( m_pHashTarget, 0, m_nWindowSize * sizeof( lzss_node_t ) );
// allocate the output buffer, compressed buffer is expected to be less, caller will free
unsigned char *pStart = pOutputBuf;
// prevent compression failure (inflation), leave enough to allow dribble eof bytes
unsigned char *pEnd = pStart + inputLength - sizeof ( lzss_header_t ) - 8;
// set the header
lzss_header_t *pHeader = (lzss_header_t *)pStart;
pHeader->id = LZSS_ID;
pHeader->actualSize = LittleLong( inputLength );
unsigned char *pOutput = pStart + sizeof (lzss_header_t);
unsigned char *pLookAhead = pInput;
unsigned char *pWindow = pInput;
unsigned char *pEncodedPosition = NULL;
unsigned char *pCmdByte = NULL;
int putCmdByte = 0;
while ( inputLength > 0 )
{
pWindow = pLookAhead - m_nWindowSize;
if ( pWindow < pInput )
{
pWindow = pInput;
}
if ( !putCmdByte )
{
pCmdByte = pOutput++;
*pCmdByte = 0;
}
putCmdByte = ( putCmdByte + 1 ) & 0x07;
int encodedLength = 0;
int lookAheadLength = inputLength < LZSS_LOOKAHEAD ? inputLength : LZSS_LOOKAHEAD;
lzss_node_t *pHash = m_pHashTable[pLookAhead[0]].pStart;
while ( pHash )
{
int matchLength = 0;
int length = lookAheadLength;
while ( length-- && pHash->pData[matchLength] == pLookAhead[matchLength] )
{
matchLength++;
}
if ( matchLength > encodedLength )
{
encodedLength = matchLength;
pEncodedPosition = pHash->pData;
}
if ( matchLength == lookAheadLength )
{
break;
}
pHash = pHash->pNext;
}
if ( encodedLength >= 3 )
{
*pCmdByte = ( *pCmdByte >> 1 ) | 0x80;
*pOutput++ = ( ( pLookAhead-pEncodedPosition-1 ) >> LZSS_LOOKSHIFT );
*pOutput++ = ( ( pLookAhead-pEncodedPosition-1 ) << LZSS_LOOKSHIFT ) | ( encodedLength-1 );
}
else
{
encodedLength = 1;
*pCmdByte = ( *pCmdByte >> 1 );
*pOutput++ = *pLookAhead;
}
for ( int i=0; i<encodedLength; i++ )
{
BuildHash( pLookAhead++ );
}
inputLength -= encodedLength;
if ( pOutput >= pEnd )
{
// compression is worse, abandon
return NULL;
}
}
if ( inputLength != 0 )
{
// unexpected failure
Assert( 0 );
return NULL;
}
if ( !putCmdByte )
{
pCmdByte = pOutput++;
*pCmdByte = 0x01;
}
else
{
*pCmdByte = ( ( *pCmdByte >> 1 ) | 0x80 ) >> ( 7 - putCmdByte );
}
*pOutput++ = 0;
*pOutput++ = 0;
if ( pOutputSize )
{
*pOutputSize = pOutput - pStart;
}
return pStart;
}
//-----------------------------------------------------------------------------
// Compress an input buffer. Caller must free output compressed buffer.
// Returns NULL if compression failed (i.e. compression yielded worse results)
//-----------------------------------------------------------------------------
unsigned char* CLZSS::Compress( unsigned char *pInput, int inputLength, unsigned int *pOutputSize )
{
unsigned char *pStart = (unsigned char *)malloc( inputLength );
unsigned char *pFinal = CompressNoAlloc( pInput, inputLength, pStart, pOutputSize );
if ( !pFinal )
{
free( pStart );
return NULL;
}
return pStart;
}
/*
// BUG BUG: This code is flaky, don't use until it's debugged!!!
unsigned int CLZSS::Uncompress( unsigned char *pInput, CUtlBuffer &buf )
{
int cmdByte = 0;
int getCmdByte = 0;
unsigned int actualSize = GetActualSize( pInput );
if ( !actualSize )
{
// unrecognized
return 0;
}
unsigned char *pBase = ( unsigned char * )buf.Base();
pInput += sizeof( lzss_header_t );
while ( !buf.IsValid() )
{
if ( !getCmdByte )
{
cmdByte = *pInput++;
}
getCmdByte = ( getCmdByte + 1 ) & 0x07;
if ( cmdByte & 0x01 )
{
int position = *pInput++ << LZSS_LOOKSHIFT;
position |= ( *pInput >> LZSS_LOOKSHIFT );
int count = ( *pInput++ & 0x0F ) + 1;
if ( count == 1 )
{
break;
}
unsigned int pos = buf.TellPut();
unsigned char *pSource = ( pBase + pos ) - position - 1;
// BUGBUG:
// This is failing!!!
// buf.WriteBytes( pSource, count );
// So have to iterate them manually
for ( int i =0; i < count; ++i )
{
buf.PutUnsignedChar( *pSource++ );
}
}
else
{
buf.PutUnsignedChar( *pInput++ );
}
cmdByte = cmdByte >> 1;
}
if ( buf.TellPut() != (int)actualSize )
{
// unexpected failure
Assert( 0 );
return 0;
}
return buf.TellPut();
}
*/
unsigned int CLZSS::SafeUncompress( unsigned char *pInput, unsigned char *pOutput, unsigned int unBufSize )
{
unsigned int totalBytes = 0;
int cmdByte = 0;
int getCmdByte = 0;
unsigned int actualSize = GetActualSize( pInput );
if ( !actualSize )
{
// unrecognized
return 0;
}
if ( actualSize > unBufSize )
{
return 0;
}
pInput += sizeof( lzss_header_t );
for ( ;; )
{
if ( !getCmdByte )
{
cmdByte = *pInput++;
}
getCmdByte = ( getCmdByte + 1 ) & 0x07;
if ( cmdByte & 0x01 )
{
int position = *pInput++ << LZSS_LOOKSHIFT;
position |= ( *pInput >> LZSS_LOOKSHIFT );
int count = ( *pInput++ & 0x0F ) + 1;
if ( count == 1 )
{
break;
}
unsigned char *pSource = pOutput - position - 1;
if ( totalBytes + count > unBufSize )
{
return 0;
}
for ( int i=0; i<count; i++ )
{
*pOutput++ = *pSource++;
}
totalBytes += count;
}
else
{
if ( totalBytes + 1 > unBufSize )
return 0;
*pOutput++ = *pInput++;
totalBytes++;
}
cmdByte = cmdByte >> 1;
}
if ( totalBytes != actualSize )
{
// unexpected failure
Assert( 0 );
return 0;
}
return totalBytes;
}
//-----------------------------------------------------------------------------
// Uncompress a buffer, Returns the uncompressed size. Caller must provide an
// adequate sized output buffer or memory corruption will occur.
//-----------------------------------------------------------------------------
unsigned int CLZSS::Uncompress( unsigned char *pInput, unsigned char *pOutput )
{
unsigned int totalBytes = 0;
int cmdByte = 0;
int getCmdByte = 0;
unsigned int actualSize = GetActualSize( pInput );
if ( !actualSize )
{
// unrecognized
return 0;
}
pInput += sizeof( lzss_header_t );
for ( ;; )
{
if ( !getCmdByte )
{
cmdByte = *pInput++;
}
getCmdByte = ( getCmdByte + 1 ) & 0x07;
if ( cmdByte & 0x01 )
{
int position = *pInput++ << LZSS_LOOKSHIFT;
position |= ( *pInput >> LZSS_LOOKSHIFT );
int count = ( *pInput++ & 0x0F ) + 1;
if ( count == 1 )
{
break;
}
unsigned char *pSource = pOutput - position - 1;
for ( int i=0; i<count; i++ )
{
*pOutput++ = *pSource++;
}
totalBytes += count;
}
else
{
*pOutput++ = *pInput++;
totalBytes++;
}
cmdByte = cmdByte >> 1;
}
if ( totalBytes != actualSize )
{
// unexpected failure
Assert( 0 );
return 0;
}
return totalBytes;
}

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@ -355,6 +355,8 @@
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@ -621,7 +623,7 @@
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@ -664,7 +666,7 @@
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@ -712,7 +714,7 @@
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@ -223,6 +223,12 @@
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@ -1691,6 +1697,12 @@
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@ -92,7 +92,7 @@
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@ -127,7 +127,7 @@
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@ -167,7 +167,7 @@
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@ -350,6 +350,8 @@
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@ -172,6 +172,12 @@
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@ -167,6 +167,7 @@
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@ -232,6 +232,12 @@
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@ -1862,6 +1871,12 @@
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@ -98,7 +98,7 @@
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<AdditionalIncludeDirectories>$(ProjectDir)..\;$(ProjectDir)..\public\;$(ProjectDir)..\thirdparty\;</AdditionalIncludeDirectories>
<FloatingPointModel>Precise</FloatingPointModel>
<MultiProcessorCompilation>true</MultiProcessorCompilation>
</ClCompile>
@ -133,7 +133,7 @@
<LanguageStandard>stdcpp17</LanguageStandard>
<PrecompiledHeaderFile>core\stdafx.h</PrecompiledHeaderFile>
<AdditionalOptions>/D "_CRT_SECURE_NO_WARNINGS" /D "SDKLAUNCHER" /D "SPDLOG_COMPILED_LIB" /D "SPDLOG_NO_EXCEPTIONS" %(AdditionalOptions)</AdditionalOptions>
<AdditionalIncludeDirectories>$(ProjectDir)..\;$(ProjectDir)..\thirdparty\</AdditionalIncludeDirectories>
<AdditionalIncludeDirectories>$(ProjectDir)..\;$(ProjectDir)..\public\;$(ProjectDir)..\thirdparty\;</AdditionalIncludeDirectories>
<FloatingPointModel>Precise</FloatingPointModel>
<BufferSecurityCheck>false</BufferSecurityCheck>
<MultiProcessorCompilation>true</MultiProcessorCompilation>
@ -173,7 +173,7 @@
<LanguageStandard>stdcpp17</LanguageStandard>
<PrecompiledHeaderFile>core\stdafx.h</PrecompiledHeaderFile>
<AdditionalOptions>/D "_CRT_SECURE_NO_WARNINGS" /D "SDKLAUNCHER" /D "SPDLOG_COMPILED_LIB" %(AdditionalOptions)</AdditionalOptions>
<AdditionalIncludeDirectories>$(ProjectDir)..\;$(ProjectDir)..\thirdparty\</AdditionalIncludeDirectories>
<AdditionalIncludeDirectories>$(ProjectDir)..\;$(ProjectDir)..\public\;$(ProjectDir)..\thirdparty\;</AdditionalIncludeDirectories>
<Optimization>Full</Optimization>
<WholeProgramOptimization>false</WholeProgramOptimization>
<FloatingPointModel>Precise</FloatingPointModel>