184 lines
4.9 KiB
C
184 lines
4.9 KiB
C
//************************************************************************
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// compress.h
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//
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// Header for MPPC compression for RDP.
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//
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// Copyright (C) 1994-2000 Microsoft Corporation
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//************************************************************************
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#ifndef __COMPRESS_H
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#define __COMPRESS_H
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#ifndef BASETYPES
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#define BASETYPES
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typedef unsigned long ULONG;
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typedef ULONG *PULONG;
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typedef unsigned short USHORT;
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typedef USHORT *PUSHORT;
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typedef unsigned char UCHAR;
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typedef UCHAR *PUCHAR;
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typedef char *PSZ;
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#endif /* !BASETYPES */
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// History buffer sizes for various compression levels.
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#define HISTORY_SIZE_8K (8192L)
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#define HISTORY_SIZE_64K (65536L)
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#ifndef OS_WINCE
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// Enabling the compression instrumentation only for debug bits.
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#ifdef DC_DEBUG
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#define COMPR_DEBUG 1
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#endif
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#endif
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// Server-only items. The Win16 client compile will complain otherwise.
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//#if defined(DLL_WD) || defined(DLL_DISP)
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// Hash table number of entries used on the compress side.
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#define HASH_TABLE_SIZE 32768
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typedef struct SendContext {
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UCHAR History [HISTORY_SIZE_64K];
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int CurrentIndex; // how far into the history buffer we are
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PUCHAR ValidHistory; // how much of history is valid
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unsigned ClientComprType; // The compression types supported by decompress.
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ULONG HistorySize; // History size used based on ComprType.
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USHORT HashTable[HASH_TABLE_SIZE]; // 16 bits=max 64K for HistorySize.
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} SendContext;
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#ifdef __cplusplus
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extern "C" {
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#endif // __cplusplus
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void initsendcontext(SendContext *, unsigned);
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UCHAR compress(UCHAR *, UCHAR *, ULONG *, SendContext *);
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#ifdef __cplusplus
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}
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#endif // __cplusplus
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//#else //(DLL_WD) || (DLL_DISP)
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// We split the receive context into two pieces to deal with the Win16
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// client's inability to malloc over 64K without using a nasty HUGE pointer.
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typedef struct RecvContext1 {
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UCHAR FAR *CurrentPtr; // how far into the history buffer we are
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} RecvContext1;
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//
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// 64K decompression context
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//
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typedef struct RecvContext2_64K {
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// We use one less byte to allow this struct to be allocated with
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// LocalAlloc() on the Win16 client.
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ULONG cbSize;
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ULONG cbHistorySize;
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UCHAR History[HISTORY_SIZE_64K - 1];
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// Won't work if on Win16.
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// Debug Fence code only works for 64K contexts
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#ifdef COMPR_DEBUG
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#define DEBUG_FENCE_16K_VALUE 0xABABABAB
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ULONG Debug16kFence;
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#endif
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} RecvContext2_64K;
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//
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// 8K decompression context
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//
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typedef struct RecvContext2_8K {
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// We use one less byte to allow this struct to be allocated with
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// LocalAlloc() on the Win16 client.
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ULONG cbSize;
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ULONG cbHistorySize;
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UCHAR History[HISTORY_SIZE_8K - 1];
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#ifdef COMPR_DEBUG
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#define DEBUG_FENCE_8K_VALUE 0xABCABCAB
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ULONG Debug8kFence;
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#endif
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} RecvContext2_8K;
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//
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// Generic decompression context.
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// This is the 'type' we use when passing around
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// compression contexts as parameters
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// size field tells us which one we're using
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//
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//
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// IMPORTANT: Field ordering must match exactly
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// Between the Generic type and any
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// size specific contexts.
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typedef struct RecvContext2_Generic {
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ULONG cbSize;
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ULONG cbHistorySize;
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UCHAR History[1];
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} RecvContext2_Generic;
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#ifdef __cplusplus
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extern "C" {
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#endif // __cplusplus
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int initrecvcontext(RecvContext1 *, RecvContext2_Generic *, unsigned ComprType);
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int decompress(
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UCHAR FAR *inbuf,
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int inlen,
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int start,
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UCHAR FAR * FAR *output,
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int *outlen,
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RecvContext1 *context1,
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RecvContext2_Generic *context2,
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unsigned ComprType);
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#ifdef __cplusplus
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}
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#endif // __cplusplus
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//#endif // DLL_WD | DLL_DISP
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//
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// Other defines
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//
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// There are 8 bits of packet data in the generalCompressedType field of the
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// SHAREDATAHEADER. Note that PACKET_ENCRYPTED is unused (therefore
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// reusable in the future).
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#define PACKET_FLUSHED 0x80
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#define PACKET_AT_FRONT 0x40
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#define PACKET_COMPRESSED 0x20
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#define PACKET_ENCRYPTED 0x10
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// Defines which of 16 potential compression types we are using.
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// 8K corresponds to the TSE4 client and server. 64K is the newer re-optimized
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// version used in TSE5. Note that the type values are re-used in the
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// GCC conference client capability set. Any client advertising support for
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// type N must support types 0..(N-1) since it could be talking to an older
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// server and receive any older type.
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#define PACKET_COMPR_TYPE_MASK 0x0F
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#define PACKET_COMPR_TYPE_8K 0
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#define PACKET_COMPR_TYPE_64K 1
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#define PACKET_COMPR_TYPE_MAX 1
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// VC compression options take up bytes 5 of the VC header flags field
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#define VC_FLAG_COMPRESS_MASK 0xFF
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#define VC_FLAG_COMPRESS_SHIFT 16
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#define VC_FLAG_PRIVATE_PROTOCOL_MASK 0xFFFF0000
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#endif // __COMPRESS_H
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