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/* $MirOS: contrib/hosted/fwcf/c_zlib.c,v 1.4 2006/09/23 23:46:35 tg Exp $ */
/*-
* Copyright (c) 2006
* Thorsten Glaser <tg@mirbsd.de>
*
* Licensee is hereby permitted to deal in this work without restric-
* tion, including unlimited rights to use, publicly perform, modify,
* merge, distribute, sell, give away or sublicence, provided all co-
* pyright notices above, these terms and the disclaimer are retained
* in all redistributions or reproduced in accompanying documentation
* or other materials provided with binary redistributions.
*
* Licensor offers the work "AS IS" and WITHOUT WARRANTY of any kind,
* express, or implied, to the maximum extent permitted by applicable
* law, without malicious intent or gross negligence; in no event may
* licensor, an author or contributor be held liable for any indirect
* or other damage, or direct damage except proven a consequence of a
* direct error of said person and intended use of this work, loss or
* other issues arising in any way out of its use, even if advised of
* the possibility of such damage or existence of a defect.
*/
#include <sys/param.h>
#include <stdio.h>
#include <stdlib.h>
#include <zlib.h>
#include "defs.h"
#include "compress.h"
__RCSID("$MirOS: contrib/hosted/fwcf/c_zlib.c,v 1.4 2006/09/23 23:46:35 tg Exp $");
static void c_zlib_load(void) __attribute__((constructor));
static int c_init(void);
static int c_compress(char **, char *, size_t)
__attribute__((bounded (string, 2, 3)));
static int c_decompress(char *, size_t, char *, size_t)
__attribute__((bounded (string, 1, 2)))
__attribute__((bounded (string, 3, 4)));
static fwcf_compressor c_zlib = {
c_init, /* init */
c_compress, /* compress */
c_decompress, /* decompress */
"zlib", /* name */
0x01 /* code */
};
static void
c_zlib_load(void)
{
if (compress_register(&c_zlib))
fputs("warning: cannot register compressor 'zlib'!\n", stderr);
}
static int
c_init(void)
{
return (0);
}
static int
c_compress(char **dst, char *src, size_t len)
{
uLongf dstlen;
if (dst == NULL)
return (-1);
dstlen = compressBound(len);
if ((*dst = malloc(dstlen)) == NULL)
return (-1);
return ((compress2((uint8_t *)*dst, &dstlen, (uint8_t *)src, len,
9) == Z_OK) ? (int)dstlen : -1);
}
static int
c_decompress(char *dst, size_t dstlen, char *src, size_t srclen)
{
uLongf len = dstlen;
return ((uncompress((uint8_t *)dst, &len, (uint8_t *)src,
srclen) == Z_OK) ? (int)len : -1);
}
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