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libfreerdp-core: initial NCrush decompression support

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This commit is contained in:
Marc-André Moreau 2014-03-16 18:01:02 -04:00
parent 882f3098b3
commit 669265d021
1 changed files with 53 additions and 22 deletions
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75
libfreerdp/codec/ncrush.c
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@ -1124,9 +1124,8 @@ int ncrush_decompress(NCRUSH_CONTEXT* ncrush, BYTE* pSrcData, UINT32 SrcSize, BY
BYTE Literal;
UINT32 BitLength;
UINT32 MaskedBits;
//UINT32 CopyOffset;
UINT32 LengthOfMatch;
//UINT32 accumulator;
UINT32 CopyOffset = 0;
UINT32 LengthOfMatch = 0;
UINT32 CopyOffsetIndex;
UINT32 OffsetCacheIndex;
BYTE* HistoryPtr;
@ -1134,10 +1133,11 @@ int ncrush_decompress(NCRUSH_CONTEXT* ncrush, BYTE* pSrcData, UINT32 SrcSize, BY
BYTE* HistoryBuffer;
BYTE* HistoryBufferEnd;
UINT32 HistoryBufferSize;
UINT32 CopyOffsetBits;
UINT32 CopyOffsetBase;
UINT32 LengthOfMatchBits;
UINT32 LengthOfMatchBase;
UINT32 CopyOffsetBits = 0;
UINT32 CopyOffsetBase = 0;
UINT32 LengthOfMatchBits = 0;
UINT32 LengthOfMatchBase = 0;
BYTE* CopyOffsetPtr = NULL;
HistoryBuffer = ncrush->HistoryBuffer;
HistoryBufferSize = ncrush->HistoryBufferSize;
@ -1206,12 +1206,12 @@ int ncrush_decompress(NCRUSH_CONTEXT* ncrush, BYTE* pSrcData, UINT32 SrcSize, BY
Literal = (HuffTableLEC[MaskedBits] & 0xFF);
*HistoryPtr++ = Literal;
printf("%c", Literal);
}
if (IndexLEC <= 256)
{
break; /* EOS */
}
CopyOffsetIndex = IndexLEC - 257;
@ -1229,17 +1229,15 @@ int ncrush_decompress(NCRUSH_CONTEXT* ncrush, BYTE* pSrcData, UINT32 SrcSize, BY
else
{
CopyOffsetBits = CopyOffsetBitsLUT[CopyOffsetIndex];
CopyOffsetBase = CopyOffsetBaseLUT[CopyOffsetIndex] - 1;
printf("\nCopyOffsetIndex: %d CopyOffsetBits: %d CopyOffsetBase: %d\n",
CopyOffsetIndex, CopyOffsetBits, CopyOffsetBase);
CopyOffsetBase = CopyOffsetBaseLUT[CopyOffsetIndex];
CopyOffset = CopyOffsetBase - 1;
if (CopyOffsetBits)
{
Mask = *((UINT16*) &HuffTableMask[(2 * CopyOffsetBits) + 3]);
MaskedBits = bits & Mask;
CopyOffsetBase += MaskedBits;
CopyOffset = CopyOffsetBase + MaskedBits - 1;
bits >>= CopyOffsetBits;
nbits -= CopyOffsetBits;
@ -1277,12 +1275,50 @@ int ncrush_decompress(NCRUSH_CONTEXT* ncrush, BYTE* pSrcData, UINT32 SrcSize, BY
ncrush->OffsetCache[3] = ncrush->OffsetCache[2];
ncrush->OffsetCache[2] = ncrush->OffsetCache[1];
ncrush->OffsetCache[1] = ncrush->OffsetCache[0];
ncrush->OffsetCache[0] = CopyOffsetBase;
ncrush->OffsetCache[0] = CopyOffset;
}
CopyOffsetPtr = HistoryPtr - CopyOffset;
LengthOfMatch = LengthOfMatchBase;
if ((HistoryPtr >= &HistoryBufferEnd[-LengthOfMatch]) ||
(CopyOffsetPtr >= &HistoryBufferEnd[-LengthOfMatch]))
{
return -1;
}
if (LengthOfMatch < 2)
{
return -1;
}
else if (LengthOfMatch == 2)
{
HistoryPtr[0] = CopyOffsetPtr[0];
HistoryPtr[1] = CopyOffsetPtr[1];
HistoryPtr += 2;
continue;
}
else
{
while (LengthOfMatch > 0)
{
*HistoryPtr++ = *CopyOffsetPtr++;
LengthOfMatch--;
}
}
}
printf("\n");
printf("MaskedBits: 0x%04X Mask: 0x%04X Index: %d BitLength: %d\n", MaskedBits, Mask, IndexLEC, BitLength);
if (IndexLEC == 256)
{
*pDstSize = HistoryPtr - ncrush->HistoryPtr;
*ppDstData = ncrush->HistoryPtr;
ncrush->HistoryPtr = HistoryPtr;
return 1;
}
else
{
return -1;
}
return 1;
}
@ -1292,11 +1328,6 @@ int ncrush_compress(NCRUSH_CONTEXT* ncrush, BYTE* pSrcData, UINT32 SrcSize, BYTE
return 1;
}
int ncrush_generate_code_table(NCRUSH_CONTEXT* ncrush, int count, int nbits, BYTE* lengthTable, UINT16* codeTable)
{
return 1;
}
NCRUSH_CONTEXT* ncrush_context_new(BOOL Compressor)
{
NCRUSH_CONTEXT* ncrush;