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/* $OpenBSD: compress_gzip.c,v 1.13 2021/06/14 17:58:15 eric Exp $ */
/*
* Copyright (c) 2012 Gilles Chehade <gilles@poolp.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 <stdlib.h>
#include <zlib.h>
#include "smtpd.h"
#define GZIP_BUFFER_SIZE 16384
static size_t compress_gzip_chunk(void *, size_t, void *, size_t);
static size_t uncompress_gzip_chunk(void *, size_t, void *, size_t);
static int compress_gzip_file(FILE *, FILE *);
static int uncompress_gzip_file(FILE *, FILE *);
struct compress_backend compress_gzip = {
compress_gzip_chunk,
uncompress_gzip_chunk,
compress_gzip_file,
uncompress_gzip_file,
};
static size_t
compress_gzip_chunk(void *ib, size_t ibsz, void *ob, size_t obsz)
{
z_stream *strm;
size_t ret = 0;
if ((strm = calloc(1, sizeof *strm)) == NULL)
return 0;
strm->zalloc = Z_NULL;
strm->zfree = Z_NULL;
strm->opaque = Z_NULL;
if (deflateInit2(strm, Z_DEFAULT_COMPRESSION, Z_DEFLATED,
(15+16), 8, Z_DEFAULT_STRATEGY) != Z_OK)
goto end;
strm->avail_in = ibsz;
strm->next_in = (unsigned char *)ib;
strm->avail_out = obsz;
strm->next_out = (unsigned char *)ob;
if (deflate(strm, Z_FINISH) != Z_STREAM_END)
goto end;
ret = strm->total_out;
end:
deflateEnd(strm);
free(strm);
return ret;
}
static size_t
uncompress_gzip_chunk(void *ib, size_t ibsz, void *ob, size_t obsz)
{
z_stream *strm;
size_t ret = 0;
if ((strm = calloc(1, sizeof *strm)) == NULL)
return 0;
strm->zalloc = Z_NULL;
strm->zfree = Z_NULL;
strm->opaque = Z_NULL;
strm->avail_in = 0;
strm->next_in = Z_NULL;
if (inflateInit2(strm, (15+16)) != Z_OK)
goto end;
strm->avail_in = ibsz;
strm->next_in = (unsigned char *)ib;
strm->avail_out = obsz;
strm->next_out = (unsigned char *)ob;
if (inflate(strm, Z_FINISH) != Z_STREAM_END)
goto end;
ret = strm->total_out;
end:
deflateEnd(strm);
free(strm);
return ret;
}
static int
compress_gzip_file(FILE *in, FILE *out)
{
gzFile gzf;
char ibuf[GZIP_BUFFER_SIZE];
int r;
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 (gzwrite(gzf, ibuf, r) != r)
goto end;
}
if (!feof(in))
goto end;
ret = 1;
end:
gzclose(gzf);
return (ret);
}
static int
uncompress_gzip_file(FILE *in, FILE *out)
{
gzFile gzf;
char obuf[GZIP_BUFFER_SIZE];
int r;
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 (fwrite(obuf, r, 1, out) != 1)
goto end;
}
if (!gzeof(gzf))
goto end;
ret = 1;
end:
gzclose(gzf);
return (ret);
}
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