1 /* $OpenBSD: deflate.c,v 1.3 2001/08/20 02:45:22 hugh 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 libkern/zlib.c and sys/zlib.h}) 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/types.h> 39 #include <sys/param.h> 40 #include <sys/malloc.h> 41 #include <sys/param.h> 42 #include <sys/kernel.h> 43 #include <sys/sdt.h> 44 #include <sys/systm.h> 45 #include <sys/zlib.h> 46 47 #include <opencrypto/cryptodev.h> 48 #include <opencrypto/deflate.h> 49 50 SDT_PROVIDER_DECLARE(opencrypto); 51 SDT_PROBE_DEFINE2(opencrypto, deflate, deflate_global, entry, 52 "int", "u_int32_t"); 53 SDT_PROBE_DEFINE6(opencrypto, deflate, deflate_global, bad, 54 "int", "int", "int", "int", "int", "int"); 55 SDT_PROBE_DEFINE6(opencrypto, deflate, deflate_global, iter, 56 "int", "int", "int", "int", "int", "int"); 57 SDT_PROBE_DEFINE2(opencrypto, deflate, deflate_global, return, 58 "int", "u_int32_t"); 59 60 int window_inflate = -1 * MAX_WBITS; 61 int window_deflate = -12; 62 63 /* 64 * This function takes a block of data and (de)compress it using the deflate 65 * algorithm 66 */ 67 68 u_int32_t 69 deflate_global(data, size, decomp, out) 70 u_int8_t *data; 71 u_int32_t size; 72 int decomp; 73 u_int8_t **out; 74 { 75 /* decomp indicates whether we compress (0) or decompress (1) */ 76 77 z_stream zbuf; 78 u_int8_t *output; 79 u_int32_t count, result; 80 int error, i; 81 struct deflate_buf *bufh, *bufp; 82 83 SDT_PROBE2(opencrypto, deflate, deflate_global, entry, decomp, size); 84 85 bufh = bufp = NULL; 86 if (!decomp) { 87 i = 1; 88 } else { 89 /* 90 * Choose a buffer with 4x the size of the input buffer 91 * for the size of the output buffer in the case of 92 * decompression. If it's not sufficient, it will need to be 93 * updated while the decompression is going on. 94 */ 95 i = 4; 96 } 97 /* 98 * Make sure we do have enough output space. Repeated calls to 99 * deflate need at least 6 bytes of output buffer space to avoid 100 * repeated markers. We will always provide at least 16 bytes. 101 */ 102 while ((size * i) < 16) 103 i++; 104 105 bufh = bufp = malloc(sizeof(*bufp) + (size_t)(size * i), 106 M_CRYPTO_DATA, M_NOWAIT); 107 if (bufp == NULL) { 108 SDT_PROBE6(opencrypto, deflate, deflate_global, bad, 109 decomp, 0, __LINE__, 0, 0, 0); 110 goto bad2; 111 } 112 bufp->next = NULL; 113 bufp->size = size * i; 114 115 bzero(&zbuf, sizeof(z_stream)); 116 zbuf.zalloc = z_alloc; 117 zbuf.zfree = z_free; 118 zbuf.opaque = Z_NULL; 119 zbuf.next_in = data; /* Data that is going to be processed. */ 120 zbuf.avail_in = size; /* Total length of data to be processed. */ 121 zbuf.next_out = bufp->data; 122 zbuf.avail_out = bufp->size; 123 124 error = decomp ? inflateInit2(&zbuf, window_inflate) : 125 deflateInit2(&zbuf, Z_DEFAULT_COMPRESSION, Z_METHOD, 126 window_deflate, Z_MEMLEVEL, Z_DEFAULT_STRATEGY); 127 if (error != Z_OK) { 128 SDT_PROBE6(opencrypto, deflate, deflate_global, bad, 129 decomp, error, __LINE__, 0, 0, 0); 130 goto bad; 131 } 132 133 for (;;) { 134 error = decomp ? inflate(&zbuf, Z_SYNC_FLUSH) : 135 deflate(&zbuf, Z_FINISH); 136 if (error != Z_OK && error != Z_STREAM_END) { 137 SDT_PROBE6(opencrypto, deflate, deflate_global, bad, 138 decomp, error, __LINE__, 139 zbuf.avail_in, zbuf.avail_out, zbuf.total_out); 140 goto bad; 141 } 142 SDT_PROBE6(opencrypto, deflate, deflate_global, iter, 143 decomp, error, __LINE__, 144 zbuf.avail_in, zbuf.avail_out, zbuf.total_out); 145 if (decomp && zbuf.avail_in == 0 && error == Z_STREAM_END) { 146 /* Done. */ 147 break; 148 } else if (!decomp && error == Z_STREAM_END) { 149 /* Done. */ 150 break; 151 } else if (zbuf.avail_out == 0) { 152 struct deflate_buf *p; 153 154 /* We need more output space for another iteration. */ 155 p = malloc(sizeof(*p) + (size_t)(size * i), 156 M_CRYPTO_DATA, M_NOWAIT); 157 if (p == NULL) { 158 SDT_PROBE6(opencrypto, deflate, deflate_global, 159 bad, decomp, 0, __LINE__, 0, 0, 0); 160 goto bad; 161 } 162 p->next = NULL; 163 p->size = size * i; 164 bufp->next = p; 165 bufp = p; 166 zbuf.next_out = bufp->data; 167 zbuf.avail_out = bufp->size; 168 } else { 169 /* Unexpect result. */ 170 SDT_PROBE6(opencrypto, deflate, deflate_global, bad, 171 decomp, error, __LINE__, 172 zbuf.avail_in, zbuf.avail_out, zbuf.total_out); 173 goto bad; 174 } 175 } 176 177 result = count = zbuf.total_out; 178 179 *out = malloc(result, M_CRYPTO_DATA, M_NOWAIT); 180 if (*out == NULL) { 181 SDT_PROBE6(opencrypto, deflate, deflate_global, bad, 182 decomp, 0, __LINE__, 0, 0, 0); 183 goto bad; 184 } 185 if (decomp) 186 inflateEnd(&zbuf); 187 else 188 deflateEnd(&zbuf); 189 output = *out; 190 for (bufp = bufh; bufp != NULL; ) { 191 if (count > bufp->size) { 192 struct deflate_buf *p; 193 194 bcopy(bufp->data, *out, bufp->size); 195 *out += bufp->size; 196 count -= bufp->size; 197 p = bufp; 198 bufp = bufp->next; 199 free(p, M_CRYPTO_DATA); 200 } else { 201 /* It should be the last buffer. */ 202 bcopy(bufp->data, *out, count); 203 *out += count; 204 free(bufp, M_CRYPTO_DATA); 205 bufp = NULL; 206 count = 0; 207 } 208 } 209 *out = output; 210 SDT_PROBE2(opencrypto, deflate, deflate_global, return, decomp, result); 211 return result; 212 213 bad: 214 if (decomp) 215 inflateEnd(&zbuf); 216 else 217 deflateEnd(&zbuf); 218 for (bufp = bufh; bufp != NULL; ) { 219 struct deflate_buf *p; 220 221 p = bufp; 222 bufp = bufp->next; 223 free(p, M_CRYPTO_DATA); 224 } 225 bad2: 226 *out = NULL; 227 return 0; 228 } 229 230 void * 231 z_alloc(nil, type, size) 232 void *nil; 233 u_int type, size; 234 { 235 void *ptr; 236 237 ptr = malloc(type *size, M_CRYPTO_DATA, M_NOWAIT); 238 return ptr; 239 } 240 241 void 242 z_free(nil, ptr) 243 void *nil, *ptr; 244 { 245 free(ptr, M_CRYPTO_DATA); 246 } 247