167 lines
3.4 KiB
C
167 lines
3.4 KiB
C
/* $OpenBSD: compress_gzip.c,v 1.13 2021/06/14 17:58:15 eric Exp $ */
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/*
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* Copyright (c) 2012 Gilles Chehade <gilles@poolp.org>
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* Copyright (c) 2012 Charles Longeau <chl@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <stdlib.h>
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#include <zlib.h>
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#include "smtpd.h"
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#define GZIP_BUFFER_SIZE 16384
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static size_t compress_gzip_chunk(void *, size_t, void *, size_t);
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static size_t uncompress_gzip_chunk(void *, size_t, void *, size_t);
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static int compress_gzip_file(FILE *, FILE *);
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static int uncompress_gzip_file(FILE *, FILE *);
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struct compress_backend compress_gzip = {
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compress_gzip_chunk,
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uncompress_gzip_chunk,
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compress_gzip_file,
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uncompress_gzip_file,
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};
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static size_t
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compress_gzip_chunk(void *ib, size_t ibsz, void *ob, size_t obsz)
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{
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z_stream *strm;
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size_t ret = 0;
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if ((strm = calloc(1, sizeof *strm)) == NULL)
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return 0;
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strm->zalloc = Z_NULL;
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strm->zfree = Z_NULL;
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strm->opaque = Z_NULL;
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if (deflateInit2(strm, Z_DEFAULT_COMPRESSION, Z_DEFLATED,
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(15+16), 8, Z_DEFAULT_STRATEGY) != Z_OK)
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goto end;
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strm->avail_in = ibsz;
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strm->next_in = (unsigned char *)ib;
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strm->avail_out = obsz;
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strm->next_out = (unsigned char *)ob;
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if (deflate(strm, Z_FINISH) != Z_STREAM_END)
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goto end;
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ret = strm->total_out;
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end:
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deflateEnd(strm);
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free(strm);
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return ret;
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}
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static size_t
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uncompress_gzip_chunk(void *ib, size_t ibsz, void *ob, size_t obsz)
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{
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z_stream *strm;
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size_t ret = 0;
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if ((strm = calloc(1, sizeof *strm)) == NULL)
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return 0;
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strm->zalloc = Z_NULL;
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strm->zfree = Z_NULL;
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strm->opaque = Z_NULL;
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strm->avail_in = 0;
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strm->next_in = Z_NULL;
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if (inflateInit2(strm, (15+16)) != Z_OK)
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goto end;
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strm->avail_in = ibsz;
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strm->next_in = (unsigned char *)ib;
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strm->avail_out = obsz;
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strm->next_out = (unsigned char *)ob;
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if (inflate(strm, Z_FINISH) != Z_STREAM_END)
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goto end;
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ret = strm->total_out;
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end:
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deflateEnd(strm);
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free(strm);
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return ret;
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}
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static int
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compress_gzip_file(FILE *in, FILE *out)
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{
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gzFile gzf;
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char ibuf[GZIP_BUFFER_SIZE];
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int r;
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int ret = 0;
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if (in == NULL || out == NULL)
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return (0);
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gzf = gzdopen(fileno(out), "wb");
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if (gzf == NULL)
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return (0);
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while ((r = fread(ibuf, 1, GZIP_BUFFER_SIZE, in)) != 0) {
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if (gzwrite(gzf, ibuf, r) != r)
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goto end;
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}
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if (!feof(in))
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goto end;
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ret = 1;
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end:
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gzclose(gzf);
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return (ret);
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}
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static int
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uncompress_gzip_file(FILE *in, FILE *out)
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{
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gzFile gzf;
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char obuf[GZIP_BUFFER_SIZE];
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int r;
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int ret = 0;
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if (in == NULL || out == NULL)
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return (0);
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gzf = gzdopen(fileno(in), "r");
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if (gzf == NULL)
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return (0);
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while ((r = gzread(gzf, obuf, sizeof(obuf))) > 0) {
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if (fwrite(obuf, r, 1, out) != 1)
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goto end;
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}
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if (!gzeof(gzf))
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goto end;
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ret = 1;
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end:
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gzclose(gzf);
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return (ret);
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}
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