mppc.c File Reference

#include <winpr/assert.h>
#include <freerdp/config.h>
#include <winpr/crt.h>
#include <winpr/print.h>
#include <winpr/stream.h>
#include <winpr/bitstream.h>
#include <freerdp/log.h>
#include "mppc.h"

Macros
#define	TAG   FREERDP_TAG("codec.mppc")
#define	MPPC_MATCH_INDEX(_sym1, _sym2, _sym3)

Functions
int	mppc_decompress (MPPC_CONTEXT *mppc, const BYTE *pSrcData, UINT32 SrcSize, const BYTE **ppDstData, UINT32 *pDstSize, UINT32 flags)
int	mppc_compress (MPPC_CONTEXT *mppc, const BYTE *pSrcData, UINT32 SrcSize, BYTE *pDstBuffer, const BYTE **ppDstData, UINT32 *pDstSize, UINT32 *pFlags)
void	mppc_set_compression_level (MPPC_CONTEXT *mppc, DWORD CompressionLevel)
void	mppc_context_reset (MPPC_CONTEXT *mppc, BOOL flush)
MPPC_CONTEXT *	mppc_context_new (DWORD CompressionLevel, BOOL Compressor)
void	mppc_context_free (MPPC_CONTEXT *mppc)

Variables
static const UINT32	MPPC_MATCH_TABLE [256]

Macro Definition Documentation

MPPC_MATCH_INDEX

#define MPPC_MATCH_INDEX	(		_sym1,
			_sym2,
			_sym3
	)

Value:

        ((((MPPC_MATCH_TABLE[_sym3] << 16) + (MPPC_MATCH_TABLE[_sym2] << 8) + \
           MPPC_MATCH_TABLE[_sym1]) &                                         \
          0x07FFF000) >>                                                      \
         12)

TAG

#define TAG   FREERDP_TAG("codec.mppc")

FreeRDP: A Remote Desktop Protocol Implementation MPPC Bulk Data Compression

Copyright 2014 Marc-Andre Moreau marca.nosp@m.ndre.nosp@m..more.nosp@m.au@g.nosp@m.mail..nosp@m.com

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Function Documentation

mppc_compress()

int mppc_compress	(	MPPC_CONTEXT *	mppc,
		const BYTE *	pSrcData,
		UINT32	SrcSize,
		BYTE *	pDstBuffer,
		const BYTE **	ppDstData,
		UINT32 *	pDstSize,
		UINT32 *	pFlags
	)

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mppc_context_free()

void mppc_context_free

(

MPPC_CONTEXT *

mppc

)

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mppc_context_new()

MPPC_CONTEXT* mppc_context_new	(	DWORD	CompressionLevel,
		BOOL	Compressor
	)

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mppc_context_reset()

void mppc_context_reset	(	MPPC_CONTEXT *	mppc,
		BOOL	flush
	)

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mppc_decompress()

int mppc_decompress	(	MPPC_CONTEXT *	mppc,
		const BYTE *	pSrcData,
		UINT32	SrcSize,
		const BYTE **	ppDstData,
		UINT32 *	pDstSize,
		UINT32	flags
	)

Literal Encoding

Literal, less than 0x80 bit 0 followed by the lower 7 bits of the literal

Literal, greater than 0x7F bits 10 followed by the lower 7 bits of the literal

CopyOffset Encoding

CopyOffset, range [0, 63] bits 11111 + lower 6 bits of CopyOffset

CopyOffset, range [64, 319] bits 11110 + lower 8 bits of (CopyOffset - 64)

CopyOffset, range [320, 2367] bits 1110 + lower 11 bits of (CopyOffset - 320)

CopyOffset, range [2368, ] bits 110 + lower 16 bits of (CopyOffset - 2368)

CopyOffset, range [0, 63] bits 1111 + lower 6 bits of CopyOffset

CopyOffset, range [64, 319] bits 1110 + lower 8 bits of (CopyOffset - 64)

CopyOffset, range [320, 8191] bits 110 + lower 13 bits of (CopyOffset - 320)

LengthOfMatch Encoding

LengthOfMatch [3] bit 0 + 0 lower bits of LengthOfMatch

LengthOfMatch [4, 7] bits 10 + 2 lower bits of LengthOfMatch

LengthOfMatch [8, 15] bits 110 + 3 lower bits of LengthOfMatch

LengthOfMatch [16, 31] bits 1110 + 4 lower bits of LengthOfMatch

LengthOfMatch [32, 63] bits 11110 + 5 lower bits of LengthOfMatch

LengthOfMatch [64, 127] bits 111110 + 6 lower bits of LengthOfMatch

LengthOfMatch [128, 255] bits 1111110 + 7 lower bits of LengthOfMatch

LengthOfMatch [256, 511] bits 11111110 + 8 lower bits of LengthOfMatch

LengthOfMatch [512, 1023] bits 111111110 + 9 lower bits of LengthOfMatch

LengthOfMatch [1024, 2047] bits 1111111110 + 10 lower bits of LengthOfMatch

LengthOfMatch [2048, 4095] bits 11111111110 + 11 lower bits of LengthOfMatch

LengthOfMatch [4096, 8191] bits 111111111110 + 12 lower bits of LengthOfMatch

LengthOfMatch [8192, 16383] bits 1111111111110 + 13 lower bits of LengthOfMatch

LengthOfMatch [16384, 32767] bits 11111111111110 + 14 lower bits of LengthOfMatch

LengthOfMatch [32768, 65535] bits 111111111111110 + 15 lower bits of LengthOfMatch

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mppc_set_compression_level()

void mppc_set_compression_level	(	MPPC_CONTEXT *	mppc,
		DWORD	CompressionLevel
	)

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Variable Documentation

MPPC_MATCH_TABLE

const UINT32 MPPC_MATCH_TABLE[256]

static