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/* $OpenBSD: compress_gzip.c,v 1.5 2012/10/11 21:34:19 gilles Exp $ */
/*
* Copyright (c) 2012 Gilles Chehade <gilles@openbsd.org>
* Copyright (c) 2012 Charles Longeau <chl@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/tree.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <imsg.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <zlib.h>
#include "smtpd.h"
#include "log.h"
#define GZIP_BUFFER_SIZE 16384
static int compress_file_gzip(FILE *, FILE *);
static int uncompress_file_gzip(FILE *, FILE *);
static size_t compress_buffer_gzip(char *, size_t, char *, size_t);
static size_t uncompress_buffer_gzip(char *, size_t, char *, size_t);
struct compress_backend compress_gzip = {
compress_file_gzip,
uncompress_file_gzip,
compress_buffer_gzip,
uncompress_buffer_gzip
};
static int
compress_file_gzip(FILE *in, FILE *out)
{
gzFile gzf;
char ibuf[GZIP_BUFFER_SIZE];
int r, w;
int ret = 0;
if (in == NULL || out == NULL)
return (0);
gzf = gzdopen(fileno(out), "wb");
if (gzf == NULL)
return (0);
while ((r = fread(ibuf, 1, GZIP_BUFFER_SIZE, in)) != 0) {
if ((w = gzwrite(gzf, ibuf, r)) != r)
goto end;
}
if (! feof(in))
goto end;
ret = 1;
end:
gzclose(gzf);
return (ret);
}
static int
uncompress_file_gzip(FILE *in, FILE *out)
{
gzFile gzf;
char obuf[GZIP_BUFFER_SIZE];
int r, w;
int ret = 0;
if (in == NULL || out == NULL)
return (0);
gzf = gzdopen(fileno(in), "r");
if (gzf == NULL)
return (0);
while ((r = gzread(gzf, obuf, sizeof(obuf))) > 0) {
if ((w = fwrite(obuf, r, 1, out)) != 1)
goto end;
}
if (! gzeof(gzf))
goto end;
ret = 1;
end:
gzclose(gzf);
return (ret);
}
static size_t
compress_buffer_gzip(char *in, size_t inlen, char *out, size_t outlen)
{
z_stream strm;
size_t ret = 0;
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, Z_DEFLATED,
(15+16), 8, Z_DEFAULT_STRATEGY);
if (ret != Z_OK)
return 0;
strm.avail_in = inlen;
strm.next_in = (unsigned char *)in;
strm.avail_out = outlen;
strm.next_out = (unsigned char *)out;
ret = deflate(&strm, Z_FINISH);
if (ret != Z_STREAM_END)
goto end;
ret = strm.total_out;
end:
(void)deflateEnd(&strm);
return ret;
}
static size_t
uncompress_buffer_gzip(char *in, size_t inlen, char *out, size_t outlen)
{
z_stream strm;
size_t ret = 0;
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = 0;
strm.next_in = Z_NULL;
ret = inflateInit2(&strm, (15+16));
if (ret != Z_OK)
return ret;
strm.avail_in = inlen;
strm.next_in = (unsigned char *)in;
strm.avail_out = outlen;
strm.next_out = (unsigned char *)out;
ret = inflate(&strm, Z_FINISH);
if (ret != Z_STREAM_END)
goto end;
ret = strm.total_out;
end:
(void)inflateEnd(&strm);
return ret;
}
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