/* $NetBSD: deflate.c,v 1.7 2006/11/16 01:33:51 christos Exp $ */ /* $FreeBSD: src/sys/opencrypto/deflate.c,v 1.1.2.1 2002/11/21 23:34:23 sam Exp $ */ /* $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 __KERNEL_RCSID(0, "$NetBSD: deflate.c,v 1.7 2006/11/16 01:33:51 christos Exp $"); #include #include #include #include #include #include #include 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 */ static void * ocf_zalloc(void *nil, u_int type, u_int size) { void *ptr; ptr = malloc(type *size, M_CRYPTO_DATA, M_NOWAIT); return ptr; } static void ocf_zfree(void *nil, void *ptr) { free(ptr, M_CRYPTO_DATA); } 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 = 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 = ocf_zalloc; zbuf.zfree = ocf_zfree; zbuf.opaque = Z_NULL; zbuf.avail_in = size; /* Total length of data to be processed */ if (!decomp) { buf[i].out = malloc(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].size = size * 4; buf[i].out = malloc(buf[i].size, M_CRYPTO_DATA, M_NOWAIT); if (buf[i].out == NULL) goto bad; buf[i].flag = 1; i++; } zbuf.next_out = buf[0].out; zbuf.avail_out = buf[0].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) goto bad; for (;;) { error = decomp ? 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(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(result, M_CRYPTO_DATA, M_NOWAIT); if (*out == NULL) goto bad; if (decomp) 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 (decomp) inflateEnd(&zbuf); else deflateEnd(&zbuf); return 0; }