*/
#include "includes.h"
-RCSID("$OpenBSD: compress.c,v 1.9 2000/09/07 20:27:50 deraadt Exp $");
+RCSID("$OpenBSD: compress.c,v 1.16 2001/12/19 07:18:56 deraadt Exp $");
-#include "ssh.h"
+#include "log.h"
#include "buffer.h"
#include "zlib.h"
+#include "compress.h"
static z_stream incoming_stream;
static z_stream outgoing_stream;
+static int compress_init_send_called = 0;
+static int compress_init_recv_called = 0;
/*
* Initializes compression; level is compression level from 1 to 9
*/
void
-buffer_compress_init(int level)
+buffer_compress_init_send(int level)
{
+ if (compress_init_send_called == 1)
+ deflateEnd(&outgoing_stream);
+ compress_init_send_called = 1;
debug("Enabling compression at level %d.", level);
if (level < 1 || level > 9)
fatal("Bad compression level %d.", level);
- inflateInit(&incoming_stream);
deflateInit(&outgoing_stream, level);
}
+void
+buffer_compress_init_recv(void)
+{
+ if (compress_init_recv_called == 1)
+ inflateEnd(&incoming_stream);
+ compress_init_recv_called = 1;
+ inflateInit(&incoming_stream);
+}
/* Frees any data structures allocated for compression. */
void
-buffer_compress_uninit()
+buffer_compress_uninit(void)
{
debug("compress outgoing: raw data %lu, compressed %lu, factor %.2f",
- outgoing_stream.total_in, outgoing_stream.total_out,
- outgoing_stream.total_in == 0 ? 0.0 :
- (double) outgoing_stream.total_out / outgoing_stream.total_in);
+ outgoing_stream.total_in, outgoing_stream.total_out,
+ outgoing_stream.total_in == 0 ? 0.0 :
+ (double) outgoing_stream.total_out / outgoing_stream.total_in);
debug("compress incoming: raw data %lu, compressed %lu, factor %.2f",
- incoming_stream.total_out, incoming_stream.total_in,
- incoming_stream.total_out == 0 ? 0.0 :
- (double) incoming_stream.total_in / incoming_stream.total_out);
- inflateEnd(&incoming_stream);
- deflateEnd(&outgoing_stream);
+ incoming_stream.total_out, incoming_stream.total_in,
+ incoming_stream.total_out == 0 ? 0.0 :
+ (double) incoming_stream.total_in / incoming_stream.total_out);
+ if (compress_init_recv_called == 1)
+ inflateEnd(&incoming_stream);
+ if (compress_init_send_called == 1)
+ deflateEnd(&outgoing_stream);
}
/*
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. */
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);
for (;;) {
/* Set up fixed-size output buffer. */
- incoming_stream.next_out = (unsigned char *) buf;
+ incoming_stream.next_out = (u_char *) buf;
incoming_stream.avail_out = sizeof(buf);
status = inflate(&incoming_stream, Z_PARTIAL_FLUSH);