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1 | /* | |
2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5 | * Interface to packet compression for ssh. | |
6 | * | |
7 | * As far as I am concerned, the code I have written for this software | |
8 | * can be used freely for any purpose. Any derived versions of this | |
9 | * software must be clearly marked as such, and if the derived work is | |
10 | * incompatible with the protocol description in the RFC file, it must be | |
11 | * called by a name other than "ssh" or "Secure Shell". | |
12 | */ | |
13 | ||
14 | /* RCSID("$OpenBSD: compress.h,v 1.7 2000/12/20 19:37:22 markus Exp $"); */ | |
15 | ||
16 | #ifndef COMPRESS_H | |
17 | #define COMPRESS_H | |
18 | ||
19 | /* | |
20 | * Initializes compression; level is compression level from 1 to 9 (as in | |
21 | * gzip). | |
22 | */ | |
23 | void buffer_compress_init(int level); | |
24 | ||
25 | /* Frees any data structures allocated by buffer_compress_init. */ | |
26 | void buffer_compress_uninit(void); | |
27 | ||
28 | /* | |
29 | * Compresses the contents of input_buffer into output_buffer. All packets | |
30 | * compressed using this function will form a single compressed data stream; | |
31 | * however, data will be flushed at the end of every call so that each | |
32 | * output_buffer can be decompressed independently (but in the appropriate | |
33 | * order since they together form a single compression stream) by the | |
34 | * receiver. This appends the compressed data to the output buffer. | |
35 | */ | |
36 | void buffer_compress(Buffer * input_buffer, Buffer * output_buffer); | |
37 | ||
38 | /* | |
39 | * Uncompresses the contents of input_buffer into output_buffer. All packets | |
40 | * uncompressed using this function will form a single compressed data | |
41 | * stream; however, data will be flushed at the end of every call so that | |
42 | * each output_buffer. This must be called for the same size units that the | |
43 | * buffer_compress was called, and in the same order that buffers compressed | |
44 | * with that. This appends the uncompressed data to the output buffer. | |
45 | */ | |
46 | void buffer_uncompress(Buffer * input_buffer, Buffer * output_buffer); | |
47 | ||
48 | #endif /* COMPRESS_H */ |