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libfreerdp-codec: start working on XCrush decompressor

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This commit is contained in:
Marc-André Moreau 2014-05-04 21:50:17 -04:00
parent 77790874c8
commit 9162fcc7d8
4 changed files with 130 additions and 3 deletions
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5
include/freerdp/codec/xcrush.h
View File

@ -46,6 +46,11 @@ typedef struct _RDP61_COMPRESSED_DATA RDP61_COMPRESSED_DATA;
struct _XCRUSH_CONTEXT
{
BOOL Compressor;
MPPC_CONTEXT* mppc;
BYTE* HistoryPtr;
UINT32 HistoryOffset;
UINT32 HistoryBufferSize;
BYTE HistoryBuffer[2000000];
};
typedef struct _XCRUSH_CONTEXT XCRUSH_CONTEXT;

111
libfreerdp/codec/xcrush.c
View File

@ -27,9 +27,113 @@
#include <freerdp/codec/xcrush.h>
int xcrush_decompress_l1(XCRUSH_CONTEXT* xcrush, BYTE* pSrcData, UINT32 SrcSize, BYTE** ppDstData, UINT32* pDstSize, UINT32 flags)
{
BYTE* pSrcEnd = NULL;
BYTE* Literals = NULL;
UINT16 MatchCount = 0;
UINT16 MatchIndex = 0;
UINT16 MatchLength = 0;
UINT32 OutputOffset = 0;
BYTE* HistoryPtr = NULL;
BYTE* HistoryBuffer = NULL;
BYTE* HistoryBufferEnd = NULL;
RDP61_MATCH_DETAILS* MatchDetails = NULL;
if (SrcSize < 1)
return -1;
if (flags & L1_PACKET_AT_FRONT)
xcrush->HistoryOffset = 0;
pSrcEnd = &pSrcData[SrcSize];
HistoryBuffer = xcrush->HistoryBuffer;
HistoryBufferEnd = &(HistoryBuffer[xcrush->HistoryBufferSize]);
xcrush->HistoryPtr = HistoryPtr = &(HistoryBuffer[xcrush->HistoryOffset]);
if (flags & L1_NO_COMPRESSION)
{
Literals = pSrcData;
}
else
{
if (!(flags & L1_COMPRESSED))
{
return -1;
}
if ((pSrcData + 2) > pSrcEnd)
{
return -1;
}
MatchCount = *((UINT16*) pSrcData);
MatchDetails = (RDP61_MATCH_DETAILS*) &pSrcData[2];
Literals = (BYTE*) &MatchDetails[MatchCount];
OutputOffset = 0;
for (MatchIndex = 0; MatchIndex < MatchCount; MatchIndex++)
{
MatchLength = MatchDetails->MatchLength;
printf("Match[%d]: Length: %d OutputOffset: %d HistoryOffset: %d\n",
(int) MatchIndex, (int) MatchDetails->MatchLength,
(int) MatchDetails->MatchOutputOffset, (int) MatchDetails->MatchHistoryOffset);
}
}
if (Literals >= pSrcEnd)
{
xcrush->HistoryOffset = HistoryPtr - HistoryBuffer;
*pDstSize = HistoryPtr - xcrush->HistoryPtr;
*ppDstData = xcrush->HistoryPtr;
return 1;
}
return 1;
}
int xcrush_decompress(XCRUSH_CONTEXT* xcrush, BYTE* pSrcData, UINT32 SrcSize, BYTE** ppDstData, UINT32* pDstSize, UINT32 flags)
{
return 1;
int status = 0;
UINT32 DstSize = 0;
BYTE* pDstData = NULL;
BYTE Level1ComprFlags;
BYTE Level2ComprFlags;
if (SrcSize < 2)
return -1;
Level1ComprFlags = pSrcData[0];
Level2ComprFlags = pSrcData[1];
pSrcData += 2;
SrcSize -= 2;
printf("Compression Flags: L1: 0x%04X L2: 0x%04X\n", Level1ComprFlags, Level2ComprFlags);
if (Level2ComprFlags & PACKET_COMPRESSED)
{
printf("Level-2 PACKET_COMPRESSED\n");
status = mppc_decompress(xcrush->mppc, pSrcData, SrcSize, &pDstData, &DstSize, Level2ComprFlags);
if (status < 0)
return status;
}
else
{
printf("Level-2 PACKET_UNCOMPRESSED\n");
pDstData = pSrcData;
DstSize = SrcSize;
}
/* Level-1 Decompression */
status = xcrush_decompress_l1(xcrush, pDstData, DstSize, ppDstData, pDstSize, Level1ComprFlags);
return status;
}
int xcrush_compress(XCRUSH_CONTEXT* xcrush, BYTE* pSrcData, UINT32 SrcSize, BYTE** ppDstData, UINT32* pDstSize, UINT32* pFlags)
@ -51,6 +155,10 @@ XCRUSH_CONTEXT* xcrush_context_new(BOOL Compressor)
if (xcrush)
{
xcrush->Compressor = Compressor;
xcrush->mppc = mppc_context_new(1, Compressor);
xcrush->HistoryOffset = 0;
xcrush->HistoryBufferSize = 2000000;
xcrush_context_reset(xcrush);
}
@ -62,6 +170,7 @@ void xcrush_context_free(XCRUSH_CONTEXT* xcrush)
{
if (xcrush)
{
mppc_context_free(xcrush->mppc);
free(xcrush);
}
}

14
libfreerdp/core/bulk.c
View File

@ -23,7 +23,7 @@
#include "bulk.h"
//#define WITH_BULK_DEBUG 1
#define WITH_BULK_DEBUG 1
const char* bulk_get_compression_flags_string(UINT32 flags)
{
@ -137,7 +137,7 @@ int bulk_decompress(rdpBulk* bulk, BYTE* pSrcData, UINT32 SrcSize, BYTE** ppDstD
break;
case PACKET_COMPR_TYPE_RDP61:
status = -1;
status = xcrush_decompress(bulk->xcrushRecv, pSrcData, SrcSize, ppDstData, pDstSize, flags);
break;
case PACKET_COMPR_TYPE_RDP8:
@ -251,8 +251,12 @@ void bulk_reset(rdpBulk* bulk)
{
mppc_context_reset(bulk->mppcSend);
mppc_context_reset(bulk->mppcRecv);
ncrush_context_reset(bulk->ncrushRecv);
ncrush_context_reset(bulk->ncrushSend);
xcrush_context_reset(bulk->xcrushRecv);
xcrush_context_reset(bulk->xcrushSend);
}
rdpBulk* bulk_new(rdpContext* context)
@ -271,6 +275,9 @@ rdpBulk* bulk_new(rdpContext* context)
bulk->ncrushRecv = ncrush_context_new(FALSE);
bulk->ncrushSend = ncrush_context_new(TRUE);
bulk->xcrushRecv = xcrush_context_new(FALSE);
bulk->xcrushSend = xcrush_context_new(TRUE);
bulk->CompressionLevel = context->settings->CompressionLevel;
bulk->TotalCompressedBytes = 0;
@ -291,5 +298,8 @@ void bulk_free(rdpBulk* bulk)
ncrush_context_free(bulk->ncrushRecv);
ncrush_context_free(bulk->ncrushSend);
xcrush_context_free(bulk->xcrushRecv);
xcrush_context_free(bulk->xcrushSend);
free(bulk);
}

3
libfreerdp/core/bulk.h
View File

@ -26,6 +26,7 @@ typedef struct rdp_bulk rdpBulk;
#include <freerdp/codec/mppc.h>
#include <freerdp/codec/ncrush.h>
#include <freerdp/codec/xcrush.h>
struct rdp_bulk
{
@ -36,6 +37,8 @@ struct rdp_bulk
MPPC_CONTEXT* mppcRecv;
NCRUSH_CONTEXT* ncrushRecv;
NCRUSH_CONTEXT* ncrushSend;
XCRUSH_CONTEXT* xcrushRecv;
XCRUSH_CONTEXT* xcrushSend;
BYTE OutputBuffer[65536];
UINT64 TotalCompressedBytes;
UINT64 TotalUncompressedBytes;