diff options
Diffstat (limited to 'crypto/openssh/compress.c')
| -rw-r--r-- | crypto/openssh/compress.c | 167 |
1 files changed, 0 insertions, 167 deletions
diff --git a/crypto/openssh/compress.c b/crypto/openssh/compress.c deleted file mode 100644 index 24778e5..0000000 --- a/crypto/openssh/compress.c +++ /dev/null @@ -1,167 +0,0 @@ -/* $OpenBSD: compress.c,v 1.26 2010/09/08 04:13:31 deraadt Exp $ */ -/* - * Author: Tatu Ylonen <ylo@cs.hut.fi> - * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland - * All rights reserved - * 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" - -#include <sys/types.h> - -#include <stdarg.h> - -#include "log.h" -#include "buffer.h" -#include "compress.h" - -#include <zlib.h> - -z_stream incoming_stream; -z_stream outgoing_stream; -static int compress_init_send_called = 0; -static int compress_init_recv_called = 0; -static int inflate_failed = 0; -static int deflate_failed = 0; - -/* - * Initializes compression; level is compression level from 1 to 9 - * (as in gzip). - */ - -void -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); - 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(void) -{ - debug("compress outgoing: raw data %llu, compressed %llu, factor %.2f", - (unsigned long long)outgoing_stream.total_in, - (unsigned long long)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 %llu, compressed %llu, factor %.2f", - (unsigned long long)incoming_stream.total_out, - (unsigned long long)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 && inflate_failed == 0) - inflateEnd(&incoming_stream); - if (compress_init_send_called == 1 && deflate_failed == 0) - deflateEnd(&outgoing_stream); -} - -/* - * Compresses the contents of input_buffer into output_buffer. All packets - * compressed using this function will form a single compressed data stream; - * however, data will be flushed at the end of every call so that each - * output_buffer can be decompressed independently (but in the appropriate - * order since they together form a single compression stream) by the - * receiver. This appends the compressed data to the output buffer. - */ - -void -buffer_compress(Buffer * input_buffer, Buffer * output_buffer) -{ - u_char buf[4096]; - int status; - - /* This case is not handled below. */ - if (buffer_len(input_buffer) == 0) - return; - - /* Input is the contents of the input buffer. */ - outgoing_stream.next_in = 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 = buf; - outgoing_stream.avail_out = sizeof(buf); - - /* Compress as much data into the buffer as possible. */ - status = deflate(&outgoing_stream, Z_PARTIAL_FLUSH); - switch (status) { - case Z_OK: - /* Append compressed data to output_buffer. */ - buffer_append(output_buffer, buf, - sizeof(buf) - outgoing_stream.avail_out); - break; - default: - deflate_failed = 1; - fatal("buffer_compress: deflate returned %d", status); - /* NOTREACHED */ - } - } while (outgoing_stream.avail_out == 0); -} - -/* - * Uncompresses the contents of input_buffer into output_buffer. All packets - * uncompressed using this function will form a single compressed data - * stream; however, data will be flushed at the end of every call so that - * each output_buffer. This must be called for the same size units that the - * buffer_compress was called, and in the same order that buffers compressed - * with that. This appends the uncompressed data to the output buffer. - */ - -void -buffer_uncompress(Buffer * input_buffer, Buffer * output_buffer) -{ - u_char buf[4096]; - int status; - - incoming_stream.next_in = buffer_ptr(input_buffer); - incoming_stream.avail_in = buffer_len(input_buffer); - - for (;;) { - /* Set up fixed-size output buffer. */ - incoming_stream.next_out = 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); - break; - case Z_BUF_ERROR: - /* - * Comments in zlib.h say that we should keep calling - * inflate() until we get an error. This appears to - * be the error that we get. - */ - return; - default: - inflate_failed = 1; - fatal("buffer_uncompress: inflate returned %d", status); - /* NOTREACHED */ - } - } -} |
