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/* $OpenBSD: xform_ipcomp.c,v 1.1 2011/07/07 02:57:24 deraadt Exp $ */
/*
* Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.org)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This file contains a wrapper around the deflate algo compression
* functions using the zlib library (see net/zlib.{c,h})
*/
#include <sys/types.h>
#include <sys/malloc.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <lib/libz/zutil.h>
#define Z_METHOD 8
#define Z_MEMLEVEL 8
#define MINCOMP 2 /* won't be used, but must be defined */
#define ZBUF 10
u_int32_t deflate_global(u_int8_t *, u_int32_t, int, u_int8_t **);
struct deflate_buf {
u_int8_t *out;
u_int32_t size;
int flag;
};
int window_inflate = -1 * MAX_WBITS;
int window_deflate = -12;
/*
* This function takes a block of data and (de)compress it using the deflate
* algorithm
*/
u_int32_t
deflate_global(u_int8_t *data, u_int32_t size, int comp, u_int8_t **out)
{
/* comp indicates whether we compress (0) or decompress (1) */
z_stream zbuf;
u_int8_t *output;
u_int32_t count, result;
int error, i = 0, j;
struct deflate_buf buf[ZBUF];
bzero(&zbuf, sizeof(z_stream));
for (j = 0; j < ZBUF; j++)
buf[j].flag = 0;
zbuf.next_in = data; /* data that is going to be processed */
zbuf.zalloc = zcalloc;
zbuf.zfree = zcfree;
zbuf.opaque = Z_NULL;
zbuf.avail_in = size; /* Total length of data to be processed */
if (comp == 0) {
buf[i].out = malloc((u_long)size, M_CRYPTO_DATA, M_NOWAIT);
if (buf[i].out == NULL)
goto bad;
buf[i].size = size;
buf[i].flag = 1;
i++;
} else {
/*
* Choose a buffer with 4x the size of the input buffer
* for the size of the output buffer in the case of
* decompression. If it's not sufficient, it will need to be
* updated while the decompression is going on
*/
buf[i].out = malloc((u_long)(size * 4), M_CRYPTO_DATA, M_NOWAIT);
if (buf[i].out == NULL)
goto bad;
buf[i].size = size * 4;
buf[i].flag = 1;
i++;
}
zbuf.next_out = buf[0].out;
zbuf.avail_out = buf[0].size;
error = comp ? inflateInit2(&zbuf, window_inflate) :
deflateInit2(&zbuf, Z_DEFAULT_COMPRESSION, Z_METHOD,
window_deflate, Z_MEMLEVEL, Z_DEFAULT_STRATEGY);
if (error != Z_OK)
goto bad;
for (;;) {
error = comp ? inflate(&zbuf, Z_PARTIAL_FLUSH) :
deflate(&zbuf, Z_PARTIAL_FLUSH);
if (error != Z_OK && error != Z_STREAM_END)
goto bad;
else if (zbuf.avail_in == 0 && zbuf.avail_out != 0)
goto end;
else if (zbuf.avail_out == 0 && i < (ZBUF - 1)) {
/* we need more output space, allocate size */
buf[i].out = malloc((u_long)size, M_CRYPTO_DATA,
M_NOWAIT);
if (buf[i].out == NULL)
goto bad;
zbuf.next_out = buf[i].out;
buf[i].size = size;
buf[i].flag = 1;
zbuf.avail_out = buf[i].size;
i++;
} else
goto bad;
}
end:
result = count = zbuf.total_out;
*out = malloc((u_long)result, M_CRYPTO_DATA, M_NOWAIT);
if (*out == NULL)
goto bad;
if (comp)
inflateEnd(&zbuf);
else
deflateEnd(&zbuf);
output = *out;
for (j = 0; buf[j].flag != 0; j++) {
if (count > buf[j].size) {
bcopy(buf[j].out, *out, buf[j].size);
*out += buf[j].size;
free(buf[j].out, M_CRYPTO_DATA);
count -= buf[j].size;
} else {
/* it should be the last buffer */
bcopy(buf[j].out, *out, count);
*out += count;
free(buf[j].out, M_CRYPTO_DATA);
count = 0;
}
}
*out = output;
return result;
bad:
*out = NULL;
for (j = 0; buf[j].flag != 0; j++)
free(buf[j].out, M_CRYPTO_DATA);
if (comp)
inflateEnd(&zbuf);
else
deflateEnd(&zbuf);
return 0;
}
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