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FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //sys/amd64/compile/hs32/modules/usr/src/sys/modules/msdosfs/@/opencrypto/deflate.c |
/* $OpenBSD: deflate.c,v 1.3 2001/08/20 02:45:22 hugh 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/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/opencrypto/deflate.c 211616 2010-08-22 11:18:57Z rpaulo $");
#include "opt_kdtrace.h"
#include <sys/types.h>
#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/sdt.h>
#include <sys/systm.h>
#include <net/zlib.h>
#include <opencrypto/cryptodev.h>
#include <opencrypto/deflate.h>
SDT_PROVIDER_DECLARE(opencrypto);
SDT_PROBE_DEFINE2(opencrypto, deflate, deflate_global, entry, entry,
"int", "u_int32_t");
SDT_PROBE_DEFINE5(opencrypto, deflate, deflate_global, bad, bad,
"int", "int", "int", "int", "int");
SDT_PROBE_DEFINE5(opencrypto, deflate, deflate_global, iter, iter,
"int", "int", "int", "int", "int");
SDT_PROBE_DEFINE2(opencrypto, deflate, deflate_global, return, return,
"int", "u_int32_t");
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(data, size, decomp, out)
u_int8_t *data;
u_int32_t size;
int decomp;
u_int8_t **out;
{
/* decomp indicates whether we compress (0) or decompress (1) */
z_stream zbuf;
u_int8_t *output;
u_int32_t count, result;
int error, i;
struct deflate_buf *bufh, *bufp;
SDT_PROBE2(opencrypto, deflate, deflate_global, entry, decomp, size);
bufh = bufp = NULL;
if (!decomp) {
i = 1;
} 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.
*/
i = 4;
}
/*
* Make sure we do have enough output space. Repeated calls to
* deflate need at least 6 bytes of output buffer space to avoid
* repeated markers. We will always provide at least 16 bytes.
*/
while ((size * i) < 16)
i++;
bufh = bufp = malloc(sizeof(*bufp) + (size_t)(size * i),
M_CRYPTO_DATA, M_NOWAIT);
if (bufp == NULL) {
SDT_PROBE3(opencrypto, deflate, deflate_global, bad,
decomp, 0, __LINE__);
goto bad2;
}
bufp->next = NULL;
bufp->size = size * i;
bzero(&zbuf, sizeof(z_stream));
zbuf.zalloc = z_alloc;
zbuf.zfree = z_free;
zbuf.opaque = Z_NULL;
zbuf.next_in = data; /* Data that is going to be processed. */
zbuf.avail_in = size; /* Total length of data to be processed. */
zbuf.next_out = bufp->data;
zbuf.avail_out = bufp->size;
error = decomp ? inflateInit2(&zbuf, window_inflate) :
deflateInit2(&zbuf, Z_DEFAULT_COMPRESSION, Z_METHOD,
window_deflate, Z_MEMLEVEL, Z_DEFAULT_STRATEGY);
if (error != Z_OK) {
SDT_PROBE3(opencrypto, deflate, deflate_global, bad,
decomp, error, __LINE__);
goto bad;
}
for (;;) {
error = decomp ? inflate(&zbuf, Z_SYNC_FLUSH) :
deflate(&zbuf, Z_FINISH);
if (error != Z_OK && error != Z_STREAM_END) {
/*
* Unfortunately we are limited to 5 arguments,
* thus use two probes.
*/
SDT_PROBE5(opencrypto, deflate, deflate_global, bad,
decomp, error, __LINE__,
zbuf.avail_in, zbuf.avail_out);
SDT_PROBE5(opencrypto, deflate, deflate_global, bad,
decomp, error, __LINE__,
zbuf.state->dummy, zbuf.total_out);
goto bad;
}
SDT_PROBE5(opencrypto, deflate, deflate_global, iter,
decomp, error, __LINE__,
zbuf.avail_in, zbuf.avail_out);
SDT_PROBE5(opencrypto, deflate, deflate_global, iter,
decomp, error, __LINE__,
zbuf.state->dummy, zbuf.total_out);
if (decomp && zbuf.avail_in == 0 && error == Z_STREAM_END) {
/* Done. */
break;
} else if (!decomp && error == Z_STREAM_END) {
/* Done. */
break;
} else if (zbuf.avail_out == 0) {
struct deflate_buf *p;
/* We need more output space for another iteration. */
p = malloc(sizeof(*p) + (size_t)(size * i),
M_CRYPTO_DATA, M_NOWAIT);
if (p == NULL) {
SDT_PROBE3(opencrypto, deflate, deflate_global,
bad, decomp, 0, __LINE__);
goto bad;
}
p->next = NULL;
p->size = size * i;
bufp->next = p;
bufp = p;
zbuf.next_out = bufp->data;
zbuf.avail_out = bufp->size;
} else {
/* Unexpect result. */
/*
* Unfortunately we are limited to 5 arguments,
* thus, again, use two probes.
*/
SDT_PROBE5(opencrypto, deflate, deflate_global, bad,
decomp, error, __LINE__,
zbuf.avail_in, zbuf.avail_out);
SDT_PROBE5(opencrypto, deflate, deflate_global, bad,
decomp, error, __LINE__,
zbuf.state->dummy, zbuf.total_out);
goto bad;
}
}
result = count = zbuf.total_out;
*out = malloc(result, M_CRYPTO_DATA, M_NOWAIT);
if (*out == NULL) {
SDT_PROBE3(opencrypto, deflate, deflate_global, bad,
decomp, 0, __LINE__);
goto bad;
}
if (decomp)
inflateEnd(&zbuf);
else
deflateEnd(&zbuf);
output = *out;
for (bufp = bufh; bufp != NULL; ) {
if (count > bufp->size) {
struct deflate_buf *p;
bcopy(bufp->data, *out, bufp->size);
*out += bufp->size;
count -= bufp->size;
p = bufp;
bufp = bufp->next;
free(p, M_CRYPTO_DATA);
} else {
/* It should be the last buffer. */
bcopy(bufp->data, *out, count);
*out += count;
free(bufp, M_CRYPTO_DATA);
bufp = NULL;
count = 0;
}
}
*out = output;
SDT_PROBE2(opencrypto, deflate, deflate_global, return, decomp, result);
return result;
bad:
if (decomp)
inflateEnd(&zbuf);
else
deflateEnd(&zbuf);
for (bufp = bufh; bufp != NULL; ) {
struct deflate_buf *p;
p = bufp;
bufp = bufp->next;
free(p, M_CRYPTO_DATA);
}
bad2:
*out = NULL;
return 0;
}
void *
z_alloc(nil, type, size)
void *nil;
u_int type, size;
{
void *ptr;
ptr = malloc(type *size, M_CRYPTO_DATA, M_NOWAIT);
return ptr;
}
void
z_free(nil, ptr)
void *nil, *ptr;
{
free(ptr, M_CRYPTO_DATA);
}