/*
- *
- * compress.c
- *
* Author: Tatu Ylonen <ylo@cs.hut.fi>
- *
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
- *
- * Created: Wed Oct 25 22:12:46 1995 ylo
- *
* Interface to packet compression for ssh.
- *
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose. Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
*/
#include "includes.h"
-RCSID("$Id$");
+RCSID("$OpenBSD: compress.c,v 1.11 2000/12/20 19:37:21 markus Exp $");
#include "ssh.h"
#include "buffer.h"
* (as in gzip).
*/
-void
+void
buffer_compress_init(int level)
{
debug("Enabling compression at level %d.", level);
/* Frees any data structures allocated for compression. */
-void
-buffer_compress_uninit()
+void
+buffer_compress_uninit(void)
{
debug("compress outgoing: raw data %lu, compressed %lu, factor %.2f",
outgoing_stream.total_in, outgoing_stream.total_out,
* receiver. This appends the compressed data to the output buffer.
*/
-void
+void
buffer_compress(Buffer * input_buffer, Buffer * output_buffer)
{
char buf[4096];
return;
/* Input is the contents of the input buffer. */
- outgoing_stream.next_in = (unsigned char *) buffer_ptr(input_buffer);
+ outgoing_stream.next_in = (u_char *) buffer_ptr(input_buffer);
outgoing_stream.avail_in = buffer_len(input_buffer);
/* Loop compressing until deflate() returns with avail_out != 0. */
do {
/* Set up fixed-size output buffer. */
- outgoing_stream.next_out = (unsigned char *)buf;
+ outgoing_stream.next_out = (u_char *)buf;
outgoing_stream.avail_out = sizeof(buf);
/* Compress as much data into the buffer as possible. */
case Z_OK:
/* Append compressed data to output_buffer. */
buffer_append(output_buffer, buf,
- sizeof(buf) - outgoing_stream.avail_out);
+ sizeof(buf) - outgoing_stream.avail_out);
break;
- case Z_STREAM_END:
- fatal("buffer_compress: deflate returned Z_STREAM_END");
- /* NOTREACHED */
- case Z_STREAM_ERROR:
- fatal("buffer_compress: deflate returned Z_STREAM_ERROR");
- /* NOTREACHED */
- case Z_BUF_ERROR:
- fatal("buffer_compress: deflate returned Z_BUF_ERROR");
- /* NOTREACHED */
default:
fatal("buffer_compress: deflate returned %d", status);
/* NOTREACHED */
}
- }
- while (outgoing_stream.avail_out == 0);
+ } while (outgoing_stream.avail_out == 0);
}
/*
* with that. This appends the uncompressed data to the output buffer.
*/
-void
+void
buffer_uncompress(Buffer * input_buffer, Buffer * output_buffer)
{
char buf[4096];
int status;
- incoming_stream.next_in = (unsigned char *) buffer_ptr(input_buffer);
+ incoming_stream.next_in = (u_char *) buffer_ptr(input_buffer);
incoming_stream.avail_in = buffer_len(input_buffer);
- incoming_stream.next_out = (unsigned char *) buf;
- incoming_stream.avail_out = sizeof(buf);
-
for (;;) {
+ /* Set up fixed-size output buffer. */
+ incoming_stream.next_out = (u_char *) buf;
+ incoming_stream.avail_out = sizeof(buf);
+
status = inflate(&incoming_stream, Z_PARTIAL_FLUSH);
switch (status) {
case Z_OK:
buffer_append(output_buffer, buf,
- sizeof(buf) - incoming_stream.avail_out);
- incoming_stream.next_out = (unsigned char *) buf;
- incoming_stream.avail_out = sizeof(buf);
+ sizeof(buf) - incoming_stream.avail_out);
break;
- case Z_STREAM_END:
- fatal("buffer_uncompress: inflate returned Z_STREAM_END");
- /* NOTREACHED */
- case Z_DATA_ERROR:
- fatal("buffer_uncompress: inflate returned Z_DATA_ERROR");
- /* NOTREACHED */
- case Z_STREAM_ERROR:
- fatal("buffer_uncompress: inflate returned Z_STREAM_ERROR");
- /* NOTREACHED */
case Z_BUF_ERROR:
/*
* Comments in zlib.h say that we should keep calling
* be the error that we get.
*/
return;
- case Z_MEM_ERROR:
- fatal("buffer_uncompress: inflate returned Z_MEM_ERROR");
- /* NOTREACHED */
default:
fatal("buffer_uncompress: inflate returned %d", status);
+ /* NOTREACHED */
}
}
}