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libfreerdp-codec: start working on xcrush compressor

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This commit is contained in:
Marc-André Moreau
2014-05-05 20:47:30 -04:00
parent db328a1e93
commit 88bee1fa6d
2 changed files with 123 additions and 0 deletions
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1
include/freerdp/codec/xcrush.h
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@@ -51,6 +51,7 @@ struct _XCRUSH_CONTEXT
UINT32 HistoryOffset;
UINT32 HistoryBufferSize;
BYTE HistoryBuffer[2000000];
BYTE BlockBuffer[16384];
};
typedef struct _XCRUSH_CONTEXT XCRUSH_CONTEXT;

122
libfreerdp/codec/xcrush.c
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@@ -190,8 +190,130 @@ int xcrush_decompress(XCRUSH_CONTEXT* xcrush, BYTE* pSrcData, UINT32 SrcSize, BY
return status;
}
int xcrush_compress_l1(XCRUSH_CONTEXT* xcrush, BYTE* pSrcData, UINT32 SrcSize, BYTE** ppDstData, UINT32* pDstSize, UINT32* pFlags)
{
UINT32 Flags = 0;
UINT32 HistoryOffset = 0;
BYTE* HistoryPtr = NULL;
BYTE* HistoryBuffer = NULL;
HistoryOffset = xcrush->HistoryOffset;
HistoryBuffer = xcrush->HistoryBuffer;
HistoryPtr = &HistoryBuffer[HistoryOffset];
CopyMemory(HistoryPtr, pSrcData, SrcSize);
xcrush->HistoryOffset += SrcSize;
if (SrcSize <= 50)
{
Flags |= L1_NO_COMPRESSION;
}
else
{
}
*pFlags = Flags;
return 1;
}
int xcrush_compress(XCRUSH_CONTEXT* xcrush, BYTE* pSrcData, UINT32 SrcSize, BYTE** ppDstData, UINT32* pDstSize, UINT32* pFlags)
{
int status = 0;
UINT32 DstSize = 0;
BYTE* pDstData = NULL;
BYTE* CompressedData = NULL;
UINT32 CompressedDataSize = 0;
BYTE* OriginalData = NULL;
UINT32 OriginalDataSize = 0;
UINT32 Level1ComprFlags = 0;
UINT32 Level2ComprFlags = 0;
UINT32 CompressionLevel = 3;
if (SrcSize > 16384)
return -1;
if ((SrcSize + 2) > *pDstSize)
return -1;
OriginalData = pDstData;
OriginalDataSize = *pDstSize;
pDstData = xcrush->BlockBuffer;
DstSize = sizeof(xcrush->BlockBuffer);
status = xcrush_compress_l1(xcrush, pSrcData, SrcSize, &pDstData, &DstSize, &Level1ComprFlags);
if (status < 0)
return status;
if (Level1ComprFlags & L1_COMPRESSED)
{
CompressedData = pDstData;
CompressedDataSize = DstSize;
if (CompressedDataSize > SrcSize)
return -1;
}
else
{
CompressedData = pSrcData;
CompressedDataSize = DstSize;
if (CompressedDataSize != SrcSize)
return -1;
}
status = 1;
pDstData = OriginalData + 2;
DstSize = OriginalDataSize - 2;
if (DstSize > 50)
{
status = mppc_compress(xcrush->mppc, CompressedData, CompressedDataSize, &pDstData, &DstSize, &Level2ComprFlags);
}
if (status < 0)
return status;
if (!(Level2ComprFlags & PACKET_COMPRESSED) || (Level2ComprFlags & PACKET_FLUSHED))
{
if (CompressedDataSize > DstSize)
return -1;
DstSize = CompressedDataSize;
CopyMemory(pDstData, CompressedData, CompressedDataSize);
}
if (Level2ComprFlags & PACKET_COMPRESSED)
{
}
else
{
if (Level2ComprFlags & PACKET_FLUSHED)
{
}
else
{
}
}
Level1ComprFlags |= L1_INNER_COMPRESSION;
OriginalData[0] = (BYTE) Level1ComprFlags;
OriginalData[1] = (BYTE) Level2ComprFlags;
if (*pDstSize < (DstSize + 2))
return -1;
*pDstSize = DstSize + 2;
*pFlags = PACKET_COMPRESSED | CompressionLevel;
return 1;
}