Annotation of sys/crypto/deflate.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: deflate.c,v 1.4 2005/03/24 11:43:40 hshoexer Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.org)
! 5: *
! 6: * Redistribution and use in source and binary forms, with or without
! 7: * modification, are permitted provided that the following conditions
! 8: * are met:
! 9: *
! 10: * 1. Redistributions of source code must retain the above copyright
! 11: * notice, this list of conditions and the following disclaimer.
! 12: * 2. Redistributions in binary form must reproduce the above copyright
! 13: * notice, this list of conditions and the following disclaimer in the
! 14: * documentation and/or other materials provided with the distribution.
! 15: * 3. The name of the author may not be used to endorse or promote products
! 16: * derived from this software without specific prior written permission.
! 17: *
! 18: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 19: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 20: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 21: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
! 22: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
! 23: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 24: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 25: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 26: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
! 27: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 28: */
! 29:
! 30: /*
! 31: * This file contains a wrapper around the deflate algo compression
! 32: * functions using the zlib library (see net/zlib.{c,h})
! 33: */
! 34:
! 35: #include <sys/types.h>
! 36: #include <sys/malloc.h>
! 37: #include <sys/param.h>
! 38: #include <sys/systm.h>
! 39: #include <net/zlib.h>
! 40: #include <crypto/deflate.h>
! 41:
! 42: int window_inflate = -1 * MAX_WBITS;
! 43: int window_deflate = -12;
! 44:
! 45: /*
! 46: * This function takes a block of data and (de)compress it using the deflate
! 47: * algorithm
! 48: */
! 49:
! 50: u_int32_t
! 51: deflate_global(u_int8_t *data, u_int32_t size, int comp, u_int8_t **out)
! 52: {
! 53: /* comp indicates whether we compress (0) or decompress (1) */
! 54:
! 55: z_stream zbuf;
! 56: u_int8_t *output;
! 57: u_int32_t count, result;
! 58: int error, i = 0, j;
! 59: struct deflate_buf buf[ZBUF];
! 60:
! 61: bzero(&zbuf, sizeof(z_stream));
! 62: for (j = 0; j < ZBUF; j++)
! 63: buf[j].flag = 0;
! 64:
! 65: zbuf.next_in = data; /* data that is going to be processed */
! 66: zbuf.zalloc = z_alloc;
! 67: zbuf.zfree = z_free;
! 68: zbuf.opaque = Z_NULL;
! 69: zbuf.avail_in = size; /* Total length of data to be processed */
! 70:
! 71: if (comp == 0) {
! 72: MALLOC(buf[i].out, u_int8_t *, (u_long) size, M_CRYPTO_DATA,
! 73: M_NOWAIT);
! 74: if (buf[i].out == NULL)
! 75: goto bad;
! 76: buf[i].size = size;
! 77: buf[i].flag = 1;
! 78: i++;
! 79: } else {
! 80: /*
! 81: * Choose a buffer with 4x the size of the input buffer
! 82: * for the size of the output buffer in the case of
! 83: * decompression. If it's not sufficient, it will need to be
! 84: * updated while the decompression is going on
! 85: */
! 86:
! 87: MALLOC(buf[i].out, u_int8_t *, (u_long) (size * 4),
! 88: M_CRYPTO_DATA, M_NOWAIT);
! 89: if (buf[i].out == NULL)
! 90: goto bad;
! 91: buf[i].size = size * 4;
! 92: buf[i].flag = 1;
! 93: i++;
! 94: }
! 95:
! 96: zbuf.next_out = buf[0].out;
! 97: zbuf.avail_out = buf[0].size;
! 98:
! 99: error = comp ? inflateInit2(&zbuf, window_inflate) :
! 100: deflateInit2(&zbuf, Z_DEFAULT_COMPRESSION, Z_METHOD,
! 101: window_deflate, Z_MEMLEVEL, Z_DEFAULT_STRATEGY, MINCOMP);
! 102:
! 103: if (error != Z_OK)
! 104: goto bad;
! 105: for (;;) {
! 106: error = comp ? inflate(&zbuf, Z_PARTIAL_FLUSH) :
! 107: deflate(&zbuf, Z_PARTIAL_FLUSH);
! 108: if (error != Z_OK && error != Z_STREAM_END)
! 109: goto bad;
! 110: else if (zbuf.avail_in == 0 && zbuf.avail_out != 0)
! 111: goto end;
! 112: else if (zbuf.avail_out == 0 && i < (ZBUF - 1)) {
! 113: /* we need more output space, allocate size */
! 114: MALLOC(buf[i].out, u_int8_t *, (u_long) size,
! 115: M_CRYPTO_DATA, M_NOWAIT);
! 116: if (buf[i].out == NULL)
! 117: goto bad;
! 118: zbuf.next_out = buf[i].out;
! 119: buf[i].size = size;
! 120: buf[i].flag = 1;
! 121: zbuf.avail_out = buf[i].size;
! 122: i++;
! 123: } else
! 124: goto bad;
! 125: }
! 126:
! 127: end:
! 128: result = count = zbuf.total_out;
! 129:
! 130: MALLOC(*out, u_int8_t *, (u_long) result, M_CRYPTO_DATA, M_NOWAIT);
! 131: if (*out == NULL)
! 132: goto bad;
! 133: if (comp)
! 134: inflateEnd(&zbuf);
! 135: else
! 136: deflateEnd(&zbuf);
! 137: output = *out;
! 138: for (j = 0; buf[j].flag != 0; j++) {
! 139: if (count > buf[j].size) {
! 140: bcopy(buf[j].out, *out, buf[j].size);
! 141: *out += buf[j].size;
! 142: FREE(buf[j].out, M_CRYPTO_DATA);
! 143: count -= buf[j].size;
! 144: } else {
! 145: /* it should be the last buffer */
! 146: bcopy(buf[j].out, *out, count);
! 147: *out += count;
! 148: FREE(buf[j].out, M_CRYPTO_DATA);
! 149: count = 0;
! 150: }
! 151: }
! 152: *out = output;
! 153: return result;
! 154:
! 155: bad:
! 156: *out = NULL;
! 157: for (j = 0; buf[j].flag != 0; j++)
! 158: FREE(buf[j].out, M_CRYPTO_DATA);
! 159: if (comp)
! 160: inflateEnd(&zbuf);
! 161: else
! 162: deflateEnd(&zbuf);
! 163: return 0;
! 164: }
! 165:
! 166: void *
! 167: z_alloc(void *nil, u_int type, u_int size)
! 168: {
! 169: void *ptr;
! 170:
! 171: ptr = malloc(type *size, M_CRYPTO_DATA, M_NOWAIT);
! 172: return ptr;
! 173: }
! 174:
! 175: void
! 176: z_free(void *nil, void *ptr, u_int size)
! 177: {
! 178: free(ptr, M_CRYPTO_DATA);
! 179: }
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