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/*
* Copyright (C) 2013 Patrick "P. J." McDermott
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <string.h>
#include <zlib.h>
#include <config.h>
#include "compression.h"
#include "logging.h"
static void
zlib_err(int status)
{
switch (status) {
case Z_OK:
case Z_STREAM_END:
break;
case Z_MEM_ERROR:
err(1, "zlib error: out of memory");
break;
case Z_VERSION_ERROR:
err(1, "zlib error: incompatible library version");
break;
case Z_STREAM_ERROR:
err(1, "zlib error: invalid stream");
break;
case Z_NEED_DICT:
err(1, "zlib error: need dictionary");
break;
case Z_DATA_ERROR:
err(1, "zlib error: corrupted data");
break;
case Z_BUF_ERROR:
err(1, "zlib error: buffer error");
break;
default:
err(1, "zlib error: unknown");
break;
}
}
void
decompress(char *src, size_t src_len, char *dest, size_t dest_len)
{
z_stream d_stream;
d_stream.zalloc = Z_NULL;
d_stream.zfree = Z_NULL;
d_stream.opaque = Z_NULL;
d_stream.next_in = (Bytef *) src;
d_stream.avail_in = src_len;
d_stream.next_out = (Bytef *) dest;
d_stream.avail_out = dest_len;
#ifdef DEBUG_COMPRESSION
debug("Initializing inflation stream...");
#endif
zlib_err(inflateInit2(&d_stream, 15 + 32));
#ifdef DEBUG_COMPRESSION
debug("Inflating %d bytes into up to %d bytes...", src_len, dest_len);
#endif
zlib_err(inflate(&d_stream, Z_NO_FLUSH));
#ifdef DEBUG_COMPRESSION
debug("Ending inflation stream...");
#endif
zlib_err(inflateEnd(&d_stream));
}
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