| File: | src/sys/arch/amd64/stand/efiboot/bootia32/../../../../../lib/libsa/cd9660.c |
| Warning: | line 184, column 2 Value stored to 'rc' is never read |
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| 1 | /* $OpenBSD: cd9660.c,v 1.15 2014/11/19 19:58:40 miod Exp $ */ |
| 2 | /* $NetBSD: cd9660.c,v 1.1 1996/09/30 16:01:19 ws Exp $ */ |
| 3 | |
| 4 | /* |
| 5 | * Copyright (C) 1996 Wolfgang Solfrank. |
| 6 | * Copyright (C) 1996 TooLs GmbH. |
| 7 | * All rights reserved. |
| 8 | * |
| 9 | * Redistribution and use in source and binary forms, with or without |
| 10 | * modification, are permitted provided that the following conditions |
| 11 | * are met: |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in the |
| 16 | * documentation and/or other materials provided with the distribution. |
| 17 | * 3. All advertising materials mentioning features or use of this software |
| 18 | * must display the following acknowledgement: |
| 19 | * This product includes software developed by TooLs GmbH. |
| 20 | * 4. The name of TooLs GmbH may not be used to endorse or promote products |
| 21 | * derived from this software without specific prior written permission. |
| 22 | * |
| 23 | * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR |
| 24 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 25 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 26 | * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 27 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 28 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
| 29 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 30 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| 31 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| 32 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 33 | */ |
| 34 | |
| 35 | /* |
| 36 | * Stand-alone ISO9660 file reading package. |
| 37 | * |
| 38 | * Note: This doesn't support Rock Ridge extensions, extended attributes, |
| 39 | * blocksizes other than 2048 bytes, multi-extent files, etc. |
| 40 | */ |
| 41 | #include <sys/param.h> |
| 42 | #include <sys/stat.h> |
| 43 | |
| 44 | #include <lib/libkern/libkern.h> |
| 45 | |
| 46 | #include <isofs/cd9660/iso.h> |
| 47 | |
| 48 | #include "stand.h" |
| 49 | #include "cd9660.h" |
| 50 | |
| 51 | struct file { |
| 52 | off_t off; /* Current offset within file */ |
| 53 | daddr32_t bno; /* Starting block number */ |
| 54 | off_t size; /* Size of file */ |
| 55 | }; |
| 56 | |
| 57 | struct ptable_ent { |
| 58 | char namlen [ISODCL( 1, 1)(1 - 1 + 1)]; /* 711 */ |
| 59 | char extlen [ISODCL( 2, 2)(2 - 2 + 1)]; /* 711 */ |
| 60 | char block [ISODCL( 3, 6)(6 - 3 + 1)]; /* 732 */ |
| 61 | char parent [ISODCL( 7, 8)(8 - 7 + 1)]; /* 722 */ |
| 62 | char name [1]; |
| 63 | }; |
| 64 | #define PTFIXSZ8 8 |
| 65 | #define PTSIZE(pp)((((8 + isonum_711((pp)->namlen))+((2)-1))/(2))*(2)) roundup(PTFIXSZ + isonum_711((pp)->namlen), 2)((((8 + isonum_711((pp)->namlen))+((2)-1))/(2))*(2)) |
| 66 | |
| 67 | #define cdb2devb(bno)((bno) * (1<<11) / (1 << 9)) ((bno) * ISO_DEFAULT_BLOCK_SIZE(1<<11) / DEV_BSIZE(1 << 9)) |
| 68 | |
| 69 | static int |
| 70 | pnmatch(const char *path, struct ptable_ent *pp) |
| 71 | { |
| 72 | const char *cp; |
| 73 | int i; |
| 74 | |
| 75 | cp = pp->name; |
| 76 | for (i = isonum_711(pp->namlen); --i >= 0; path++, cp++) { |
| 77 | if (toupper(*path)(((*path) >= 'a' && (*path) <= 'z')?((*path) - 'a' + 'A'):(*path)) == *cp) |
| 78 | continue; |
| 79 | return 0; |
| 80 | } |
| 81 | if (*path != '/') |
| 82 | return 0; |
| 83 | return 1; |
| 84 | } |
| 85 | |
| 86 | static int |
| 87 | dirmatch(const char *path, struct iso_directory_record *dp) |
| 88 | { |
| 89 | const char *cp; |
| 90 | int i; |
| 91 | |
| 92 | /* This needs to be a regular file */ |
| 93 | if (dp->flags[0] & 6) |
| 94 | return 0; |
| 95 | |
| 96 | cp = dp->name; |
| 97 | for (i = isonum_711(dp->name_len); --i >= 0; path++, cp++) { |
| 98 | if (!*path) |
| 99 | break; |
| 100 | if (toupper(*path)(((*path) >= 'a' && (*path) <= 'z')?((*path) - 'a' + 'A'):(*path)) == *cp) |
| 101 | continue; |
| 102 | return 0; |
| 103 | } |
| 104 | if (*path) |
| 105 | return 0; |
| 106 | /* |
| 107 | * Allow stripping of trailing dots and the version number. |
| 108 | * Note that this will find the first instead of the last version |
| 109 | * of a file. |
| 110 | */ |
| 111 | if (i >= 0 && (*cp == ';' || *cp == '.')) { |
| 112 | /* This is to prevent matching of numeric extensions */ |
| 113 | if (*cp == '.' && cp[1] != ';') |
| 114 | return 0; |
| 115 | while (--i >= 0) |
| 116 | if (*++cp != ';' && (*cp < '0' || *cp > '9')) |
| 117 | return 0; |
| 118 | } |
| 119 | return 1; |
| 120 | } |
| 121 | |
| 122 | int |
| 123 | cd9660_open(char *path, struct open_file *f) |
| 124 | { |
| 125 | struct file *fp = 0; |
| 126 | char *buf; |
| 127 | struct iso_primary_descriptor *vd; |
| 128 | size_t buf_size, nread, psize, dsize; |
| 129 | daddr32_t bno; |
| 130 | int parent, ent; |
| 131 | struct ptable_ent *pp; |
| 132 | struct iso_directory_record *dp; |
| 133 | int rc; |
| 134 | |
| 135 | /* First find the volume descriptor */ |
| 136 | buf = alloc(buf_size = ISO_DEFAULT_BLOCK_SIZE(1<<11)); |
| 137 | dp = (struct iso_directory_record *)buf; |
| 138 | vd = (struct iso_primary_descriptor *)buf; |
| 139 | for (bno = 16;; bno++) { |
| 140 | twiddle(); |
| 141 | rc = f->f_dev->dv_strategy(f->f_devdata, F_READ0x0001, cdb2devb(bno)((bno) * (1<<11) / (1 << 9)), |
| 142 | ISO_DEFAULT_BLOCK_SIZE(1<<11), buf, &nread); |
| 143 | if (rc) |
| 144 | goto out; |
| 145 | if (nread != ISO_DEFAULT_BLOCK_SIZE(1<<11)) { |
| 146 | rc = EIO5; |
| 147 | goto out; |
| 148 | } |
| 149 | rc = EINVAL22; |
| 150 | if (bcmp(vd->id, ISO_STANDARD_ID, sizeof vd->id)(memcmp(("CD001"),(vd->id),(sizeof vd->id))) != 0) |
| 151 | goto out; |
| 152 | if (isonum_711(vd->type) == ISO_VD_END255) |
| 153 | goto out; |
| 154 | if (isonum_711(vd->type) == ISO_VD_PRIMARY1) |
| 155 | break; |
| 156 | } |
| 157 | if (isonum_723(vd->logical_block_size) != ISO_DEFAULT_BLOCK_SIZE(1<<11)) |
| 158 | goto out; |
| 159 | |
| 160 | /* Now get the path table and lookup the directory of the file */ |
| 161 | bno = isonum_732(vd->type_m_path_table); |
| 162 | psize = isonum_733(vd->path_table_size); |
| 163 | |
| 164 | if (psize > ISO_DEFAULT_BLOCK_SIZE(1<<11)) { |
| 165 | free(buf, ISO_DEFAULT_BLOCK_SIZE(1<<11)); |
| 166 | buf = alloc(buf_size = roundup(psize, ISO_DEFAULT_BLOCK_SIZE)((((psize)+(((1<<11))-1))/((1<<11)))*((1<<11 )))); |
| 167 | } |
| 168 | |
| 169 | twiddle(); |
| 170 | rc = f->f_dev->dv_strategy(f->f_devdata, F_READ0x0001, cdb2devb(bno)((bno) * (1<<11) / (1 << 9)), |
| 171 | buf_size, buf, &nread); |
| 172 | if (rc) |
| 173 | goto out; |
| 174 | if (nread != buf_size) { |
| 175 | rc = EIO5; |
| 176 | goto out; |
| 177 | } |
| 178 | |
| 179 | parent = 1; |
| 180 | pp = (struct ptable_ent *)buf; |
| 181 | ent = 1; |
| 182 | bno = isonum_732(pp->block) + isonum_711(pp->extlen); |
| 183 | |
| 184 | rc = ENOENT2; |
Value stored to 'rc' is never read | |
| 185 | /* |
| 186 | * Remove extra separators |
| 187 | */ |
| 188 | while (*path == '/') |
| 189 | path++; |
| 190 | |
| 191 | while (*path) { |
| 192 | if ((char *)pp >= buf + psize) |
| 193 | break; |
| 194 | if (isonum_722(pp->parent) != parent) |
| 195 | break; |
| 196 | if (!pnmatch(path, pp)) { |
| 197 | pp = (struct ptable_ent *)((char *)pp + PTSIZE(pp)((((8 + isonum_711((pp)->namlen))+((2)-1))/(2))*(2))); |
| 198 | ent++; |
| 199 | continue; |
| 200 | } |
| 201 | path += isonum_711(pp->namlen) + 1; |
| 202 | parent = ent; |
| 203 | bno = isonum_732(pp->block) + isonum_711(pp->extlen); |
| 204 | while ((char *)pp < buf + psize) { |
| 205 | if (isonum_722(pp->parent) == parent) |
| 206 | break; |
| 207 | pp = (struct ptable_ent *)((char *)pp + PTSIZE(pp)((((8 + isonum_711((pp)->namlen))+((2)-1))/(2))*(2))); |
| 208 | ent++; |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | /* Now bno has the start of the directory that supposedly contains the file */ |
| 213 | bno--; |
| 214 | dsize = 1; /* Something stupid, but > 0 XXX */ |
| 215 | for (psize = 0; psize < dsize;) { |
| 216 | if (!(psize % ISO_DEFAULT_BLOCK_SIZE(1<<11))) { |
| 217 | bno++; |
| 218 | twiddle(); |
| 219 | rc = f->f_dev->dv_strategy(f->f_devdata, F_READ0x0001, |
| 220 | cdb2devb(bno)((bno) * (1<<11) / (1 << 9)), |
| 221 | ISO_DEFAULT_BLOCK_SIZE(1<<11), |
| 222 | buf, &nread); |
| 223 | if (rc) |
| 224 | goto out; |
| 225 | if (nread != ISO_DEFAULT_BLOCK_SIZE(1<<11)) { |
| 226 | rc = EIO5; |
| 227 | goto out; |
| 228 | } |
| 229 | dp = (struct iso_directory_record *)buf; |
| 230 | } |
| 231 | if (!isonum_711(dp->length)) { |
| 232 | if ((void *)dp == buf) |
| 233 | psize += ISO_DEFAULT_BLOCK_SIZE(1<<11); |
| 234 | else |
| 235 | psize = roundup(psize, ISO_DEFAULT_BLOCK_SIZE)((((psize)+(((1<<11))-1))/((1<<11)))*((1<<11 ))); |
| 236 | continue; |
| 237 | } |
| 238 | if (dsize == 1) |
| 239 | dsize = isonum_733(dp->size); |
| 240 | if (dirmatch(path, dp)) |
| 241 | break; |
| 242 | psize += isonum_711(dp->length); |
| 243 | dp = (struct iso_directory_record *)((char *)dp + |
| 244 | isonum_711(dp->length)); |
| 245 | } |
| 246 | |
| 247 | if (psize >= dsize) { |
| 248 | rc = ENOENT2; |
| 249 | goto out; |
| 250 | } |
| 251 | |
| 252 | /* allocate file system specific data structure */ |
| 253 | fp = alloc(sizeof(struct file)); |
| 254 | bzero(fp, sizeof(struct file))((void)memset((fp),0,(sizeof(struct file)))); |
| 255 | f->f_fsdata = (void *)fp; |
| 256 | |
| 257 | fp->off = 0; |
| 258 | fp->bno = isonum_733(dp->extent); |
| 259 | fp->size = isonum_733(dp->size); |
| 260 | free(buf, buf_size); |
| 261 | |
| 262 | return 0; |
| 263 | |
| 264 | out: |
| 265 | if (fp) |
| 266 | free(fp, sizeof(struct file)); |
| 267 | free(buf, buf_size); |
| 268 | |
| 269 | return rc; |
| 270 | } |
| 271 | |
| 272 | int |
| 273 | cd9660_close(struct open_file *f) |
| 274 | { |
| 275 | struct file *fp = (struct file *)f->f_fsdata; |
| 276 | |
| 277 | f->f_fsdata = 0; |
| 278 | free(fp, sizeof *fp); |
| 279 | |
| 280 | return 0; |
| 281 | } |
| 282 | |
| 283 | int |
| 284 | cd9660_read(struct open_file *f, void *start, size_t size, size_t *resid) |
| 285 | { |
| 286 | struct file *fp = (struct file *)f->f_fsdata; |
| 287 | int rc = 0; |
| 288 | daddr32_t bno; |
| 289 | char buf[ISO_DEFAULT_BLOCK_SIZE(1<<11)]; |
| 290 | char *dp, *st = start; |
| 291 | size_t nread, off; |
| 292 | |
| 293 | while (size) { |
| 294 | if (fp->off < 0 || fp->off >= fp->size) |
| 295 | break; |
| 296 | bno = (fp->off >> ISO_DEFAULT_BLOCK_SHIFT11) + fp->bno; |
| 297 | if (fp->off & (ISO_DEFAULT_BLOCK_SIZE(1<<11) - 1) |
| 298 | || size < ISO_DEFAULT_BLOCK_SIZE(1<<11)) |
| 299 | dp = buf; |
| 300 | else |
| 301 | dp = st; |
| 302 | twiddle(); |
| 303 | rc = f->f_dev->dv_strategy(f->f_devdata, F_READ0x0001, cdb2devb(bno)((bno) * (1<<11) / (1 << 9)), |
| 304 | ISO_DEFAULT_BLOCK_SIZE(1<<11), dp, &nread); |
| 305 | if (rc) |
| 306 | return rc; |
| 307 | if (nread != ISO_DEFAULT_BLOCK_SIZE(1<<11)) |
| 308 | return EIO5; |
| 309 | |
| 310 | /* |
| 311 | * off is either 0 in the dp == st case or |
| 312 | * the offset to the interesting data into the buffer of 'buf' |
| 313 | */ |
| 314 | off = fp->off & (ISO_DEFAULT_BLOCK_SIZE(1<<11) - 1); |
| 315 | nread -= off; |
| 316 | if (nread > size) |
| 317 | nread = size; |
| 318 | |
| 319 | if (nread > (fp->size - fp->off)) |
| 320 | nread = (fp->size - fp->off); |
| 321 | |
| 322 | if (dp == buf) |
| 323 | bcopy(buf + off, st, nread)((void)memmove((st),(buf + off),(nread))); |
| 324 | |
| 325 | st += nread; |
| 326 | fp->off += nread; |
| 327 | size -= nread; |
| 328 | } |
| 329 | if (resid) |
| 330 | *resid = size; |
| 331 | return rc; |
| 332 | } |
| 333 | |
| 334 | int |
| 335 | cd9660_write(struct open_file *f, void *start, size_t size, size_t *resid) |
| 336 | { |
| 337 | return EROFS30; |
| 338 | } |
| 339 | |
| 340 | off_t |
| 341 | cd9660_seek(struct open_file *f, off_t offset, int where) |
| 342 | { |
| 343 | struct file *fp = (struct file *)f->f_fsdata; |
| 344 | |
| 345 | switch (where) { |
| 346 | case SEEK_SET0: |
| 347 | fp->off = offset; |
| 348 | break; |
| 349 | case SEEK_CUR1: |
| 350 | fp->off += offset; |
| 351 | break; |
| 352 | case SEEK_END2: |
| 353 | fp->off = fp->size - offset; |
| 354 | break; |
| 355 | default: |
| 356 | return -1; |
| 357 | } |
| 358 | return fp->off; |
| 359 | } |
| 360 | |
| 361 | int |
| 362 | cd9660_stat(struct open_file *f, struct stat *sb) |
| 363 | { |
| 364 | struct file *fp = (struct file *)f->f_fsdata; |
| 365 | |
| 366 | /* only important stuff */ |
| 367 | sb->st_mode = S_IFREG0100000 | S_IRUSR0000400 | S_IRGRP0000040 | S_IROTH0000004; |
| 368 | sb->st_uid = sb->st_gid = 0; |
| 369 | sb->st_size = fp->size; |
| 370 | return 0; |
| 371 | } |
| 372 | |
| 373 | /* |
| 374 | * Not implemented. |
| 375 | */ |
| 376 | #ifndef NO_READDIR |
| 377 | int |
| 378 | cd9660_readdir(struct open_file *f, char *name) |
| 379 | { |
| 380 | return (EROFS30); |
| 381 | } |
| 382 | #endif |