58 lines
2.1 KiB
C
58 lines
2.1 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* Implements Microsoft Point to Point Compression (MPPC) protocol
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*
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* Copyright 2011 Laxmikant Rashinkar <LK.Rashinkar@gmail.com>
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* Copyright Jiten Pathy
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef FREERDP_CODEC_MPPC_DECODER_H
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#define FREERDP_CODEC_MPPC_DECODER_H
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#include <freerdp/api.h>
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#include <freerdp/types.h>
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/* Compression Types */
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#define PACKET_COMPRESSED 0x20
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#define PACKET_AT_FRONT 0x40
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#define PACKET_FLUSHED 0x80
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#define PACKET_COMPR_TYPE_8K 0x00
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#define PACKET_COMPR_TYPE_64K 0x01
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#define PACKET_COMPR_TYPE_RDP6 0x02
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#define PACKET_COMPR_TYPE_RDP61 0x03
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#define CompressionTypeMask 0x0F
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#define RDP6_HISTORY_BUF_SIZE 65536
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#define RDP6_OFFSET_CACHE_SIZE 8
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struct rdp_mppc_dec
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{
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BYTE* history_buf;
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UINT16* offset_cache;
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BYTE* history_buf_end;
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BYTE* history_ptr;
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};
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FREERDP_API int decompress_rdp(struct rdp_mppc_dec* dec, BYTE* cbuf, int len, int ctype, UINT32* roff, UINT32* rlen);
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FREERDP_API int decompress_rdp_4(struct rdp_mppc_dec* dec, BYTE* cbuf, int len, int ctype, UINT32* roff, UINT32* rlen);
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FREERDP_API int decompress_rdp_5(struct rdp_mppc_dec* dec, BYTE* cbuf, int len, int ctype, UINT32* roff, UINT32* rlen);
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FREERDP_API int decompress_rdp_6(struct rdp_mppc_dec* dec, BYTE* cbuf, int len, int ctype, UINT32* roff, UINT32* rlen);
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FREERDP_API int decompress_rdp_61(struct rdp_mppc_dec* dec, BYTE* cbuf, int len, int ctype, UINT32* roff, UINT32* rlen);
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FREERDP_API struct rdp_mppc_dec* mppc_dec_new(void);
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FREERDP_API void mppc_dec_free(struct rdp_mppc_dec* dec);
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#endif /* FREERDP_CODEC_MPPC_DECODER_H */
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