version 1.7.2.4, 2001/03/21 18:52:43 |
version 1.8, 2000/06/20 01:39:40 |
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/* |
/* |
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* |
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* compress.c |
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* |
* Author: Tatu Ylonen <ylo@cs.hut.fi> |
* Author: Tatu Ylonen <ylo@cs.hut.fi> |
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* |
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
* All rights reserved |
* All rights reserved |
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* |
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* Created: Wed Oct 25 22:12:46 1995 ylo |
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* |
* Interface to packet compression for ssh. |
* Interface to packet compression for ssh. |
* |
* |
* As far as I am concerned, the code I have written for this software |
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* can be used freely for any purpose. Any derived versions of this |
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* software must be clearly marked as such, and if the derived work is |
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* incompatible with the protocol description in the RFC file, it must be |
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* called by a name other than "ssh" or "Secure Shell". |
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*/ |
*/ |
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#include "includes.h" |
#include "includes.h" |
RCSID("$OpenBSD$"); |
RCSID("$OpenBSD$"); |
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#include "log.h" |
#include "ssh.h" |
#include "buffer.h" |
#include "buffer.h" |
#include "zlib.h" |
#include "zlib.h" |
#include "compress.h" |
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static z_stream incoming_stream; |
static z_stream incoming_stream; |
static z_stream outgoing_stream; |
static z_stream outgoing_stream; |
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/* Frees any data structures allocated for compression. */ |
/* Frees any data structures allocated for compression. */ |
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void |
void |
buffer_compress_uninit(void) |
buffer_compress_uninit() |
{ |
{ |
debug("compress outgoing: raw data %lu, compressed %lu, factor %.2f", |
debug("compress outgoing: raw data %lu, compressed %lu, factor %.2f", |
outgoing_stream.total_in, outgoing_stream.total_out, |
outgoing_stream.total_in, outgoing_stream.total_out, |
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return; |
return; |
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/* Input is the contents of the input buffer. */ |
/* Input is the contents of the input buffer. */ |
outgoing_stream.next_in = (u_char *) buffer_ptr(input_buffer); |
outgoing_stream.next_in = (unsigned char *) buffer_ptr(input_buffer); |
outgoing_stream.avail_in = buffer_len(input_buffer); |
outgoing_stream.avail_in = buffer_len(input_buffer); |
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/* Loop compressing until deflate() returns with avail_out != 0. */ |
/* Loop compressing until deflate() returns with avail_out != 0. */ |
do { |
do { |
/* Set up fixed-size output buffer. */ |
/* Set up fixed-size output buffer. */ |
outgoing_stream.next_out = (u_char *)buf; |
outgoing_stream.next_out = (unsigned char *)buf; |
outgoing_stream.avail_out = sizeof(buf); |
outgoing_stream.avail_out = sizeof(buf); |
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/* Compress as much data into the buffer as possible. */ |
/* Compress as much data into the buffer as possible. */ |
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char buf[4096]; |
char buf[4096]; |
int status; |
int status; |
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incoming_stream.next_in = (u_char *) buffer_ptr(input_buffer); |
incoming_stream.next_in = (unsigned char *) buffer_ptr(input_buffer); |
incoming_stream.avail_in = buffer_len(input_buffer); |
incoming_stream.avail_in = buffer_len(input_buffer); |
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for (;;) { |
for (;;) { |
/* Set up fixed-size output buffer. */ |
/* Set up fixed-size output buffer. */ |
incoming_stream.next_out = (u_char *) buf; |
incoming_stream.next_out = (unsigned char *) buf; |
incoming_stream.avail_out = sizeof(buf); |
incoming_stream.avail_out = sizeof(buf); |
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status = inflate(&incoming_stream, Z_PARTIAL_FLUSH); |
status = inflate(&incoming_stream, Z_PARTIAL_FLUSH); |