264 lines
7.2 KiB
C
264 lines
7.2 KiB
C
/* $OpenBSD: deflate.c,v 1.3 2001/08/20 02:45:22 hugh Exp $ */
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/*-
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* Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.org)
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* This file contains a wrapper around the deflate algo compression
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* functions using the zlib library (see net/zlib.{c,h})
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/malloc.h>
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/sdt.h>
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#include <sys/systm.h>
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#include <net/zlib.h>
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#include <opencrypto/cryptodev.h>
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#include <opencrypto/deflate.h>
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SDT_PROVIDER_DECLARE(opencrypto);
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SDT_PROBE_DEFINE2(opencrypto, deflate, deflate_global, entry,
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"int", "u_int32_t");
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SDT_PROBE_DEFINE5(opencrypto, deflate, deflate_global, bad,
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"int", "int", "int", "int", "int");
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SDT_PROBE_DEFINE5(opencrypto, deflate, deflate_global, iter,
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"int", "int", "int", "int", "int");
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SDT_PROBE_DEFINE2(opencrypto, deflate, deflate_global, return,
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"int", "u_int32_t");
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int window_inflate = -1 * MAX_WBITS;
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int window_deflate = -12;
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/*
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* This function takes a block of data and (de)compress it using the deflate
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* algorithm
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*/
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u_int32_t
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deflate_global(data, size, decomp, out)
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u_int8_t *data;
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u_int32_t size;
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int decomp;
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u_int8_t **out;
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{
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/* decomp indicates whether we compress (0) or decompress (1) */
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z_stream zbuf;
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u_int8_t *output;
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u_int32_t count, result;
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int error, i;
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struct deflate_buf *bufh, *bufp;
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SDT_PROBE2(opencrypto, deflate, deflate_global, entry, decomp, size);
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bufh = bufp = NULL;
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if (!decomp) {
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i = 1;
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} else {
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/*
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* Choose a buffer with 4x the size of the input buffer
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* for the size of the output buffer in the case of
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* decompression. If it's not sufficient, it will need to be
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* updated while the decompression is going on.
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*/
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i = 4;
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}
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/*
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* Make sure we do have enough output space. Repeated calls to
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* deflate need at least 6 bytes of output buffer space to avoid
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* repeated markers. We will always provide at least 16 bytes.
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*/
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while ((size * i) < 16)
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i++;
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bufh = bufp = malloc(sizeof(*bufp) + (size_t)(size * i),
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M_CRYPTO_DATA, M_NOWAIT);
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if (bufp == NULL) {
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SDT_PROBE3(opencrypto, deflate, deflate_global, bad,
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decomp, 0, __LINE__);
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goto bad2;
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}
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bufp->next = NULL;
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bufp->size = size * i;
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bzero(&zbuf, sizeof(z_stream));
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zbuf.zalloc = z_alloc;
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zbuf.zfree = z_free;
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zbuf.opaque = Z_NULL;
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zbuf.next_in = data; /* Data that is going to be processed. */
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zbuf.avail_in = size; /* Total length of data to be processed. */
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zbuf.next_out = bufp->data;
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zbuf.avail_out = bufp->size;
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error = decomp ? inflateInit2(&zbuf, window_inflate) :
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deflateInit2(&zbuf, Z_DEFAULT_COMPRESSION, Z_METHOD,
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window_deflate, Z_MEMLEVEL, Z_DEFAULT_STRATEGY);
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if (error != Z_OK) {
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SDT_PROBE3(opencrypto, deflate, deflate_global, bad,
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decomp, error, __LINE__);
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goto bad;
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}
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for (;;) {
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error = decomp ? inflate(&zbuf, Z_SYNC_FLUSH) :
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deflate(&zbuf, Z_FINISH);
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if (error != Z_OK && error != Z_STREAM_END) {
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/*
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* Unfortunately we are limited to 5 arguments,
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* thus use two probes.
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*/
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SDT_PROBE5(opencrypto, deflate, deflate_global, bad,
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decomp, error, __LINE__,
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zbuf.avail_in, zbuf.avail_out);
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SDT_PROBE5(opencrypto, deflate, deflate_global, bad,
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decomp, error, __LINE__,
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zbuf.state->dummy, zbuf.total_out);
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goto bad;
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}
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SDT_PROBE5(opencrypto, deflate, deflate_global, iter,
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decomp, error, __LINE__,
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zbuf.avail_in, zbuf.avail_out);
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SDT_PROBE5(opencrypto, deflate, deflate_global, iter,
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decomp, error, __LINE__,
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zbuf.state->dummy, zbuf.total_out);
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if (decomp && zbuf.avail_in == 0 && error == Z_STREAM_END) {
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/* Done. */
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break;
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} else if (!decomp && error == Z_STREAM_END) {
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/* Done. */
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break;
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} else if (zbuf.avail_out == 0) {
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struct deflate_buf *p;
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/* We need more output space for another iteration. */
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p = malloc(sizeof(*p) + (size_t)(size * i),
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M_CRYPTO_DATA, M_NOWAIT);
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if (p == NULL) {
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SDT_PROBE3(opencrypto, deflate, deflate_global,
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bad, decomp, 0, __LINE__);
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goto bad;
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}
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p->next = NULL;
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p->size = size * i;
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bufp->next = p;
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bufp = p;
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zbuf.next_out = bufp->data;
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zbuf.avail_out = bufp->size;
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} else {
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/* Unexpect result. */
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/*
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* Unfortunately we are limited to 5 arguments,
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* thus, again, use two probes.
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*/
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SDT_PROBE5(opencrypto, deflate, deflate_global, bad,
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decomp, error, __LINE__,
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zbuf.avail_in, zbuf.avail_out);
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SDT_PROBE5(opencrypto, deflate, deflate_global, bad,
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decomp, error, __LINE__,
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zbuf.state->dummy, zbuf.total_out);
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goto bad;
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}
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}
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result = count = zbuf.total_out;
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*out = malloc(result, M_CRYPTO_DATA, M_NOWAIT);
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if (*out == NULL) {
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SDT_PROBE3(opencrypto, deflate, deflate_global, bad,
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decomp, 0, __LINE__);
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goto bad;
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}
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if (decomp)
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inflateEnd(&zbuf);
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else
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deflateEnd(&zbuf);
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output = *out;
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for (bufp = bufh; bufp != NULL; ) {
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if (count > bufp->size) {
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struct deflate_buf *p;
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bcopy(bufp->data, *out, bufp->size);
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*out += bufp->size;
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count -= bufp->size;
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p = bufp;
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bufp = bufp->next;
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free(p, M_CRYPTO_DATA);
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} else {
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/* It should be the last buffer. */
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bcopy(bufp->data, *out, count);
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*out += count;
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free(bufp, M_CRYPTO_DATA);
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bufp = NULL;
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count = 0;
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}
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}
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*out = output;
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SDT_PROBE2(opencrypto, deflate, deflate_global, return, decomp, result);
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return result;
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bad:
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if (decomp)
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inflateEnd(&zbuf);
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else
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deflateEnd(&zbuf);
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for (bufp = bufh; bufp != NULL; ) {
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struct deflate_buf *p;
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p = bufp;
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bufp = bufp->next;
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free(p, M_CRYPTO_DATA);
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}
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bad2:
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*out = NULL;
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return 0;
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}
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void *
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z_alloc(nil, type, size)
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void *nil;
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u_int type, size;
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{
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void *ptr;
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ptr = malloc(type *size, M_CRYPTO_DATA, M_NOWAIT);
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return ptr;
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}
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void
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z_free(nil, ptr)
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void *nil, *ptr;
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{
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free(ptr, M_CRYPTO_DATA);
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}
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