package/mtd/src/jffs2.c

   1 #include <sys/types.h>
   2 #include <sys/stat.h>
   3 #include <stdint.h>
   4 #include <stdio.h>
   5 #include <fcntl.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8 #include <dirent.h>
   9 #include <unistd.h>
  10 #include <endian.h>
  11 #include "jffs2.h"
  12 #include "crc32.h"
  13 #include "mtd.h"
  14
  15 #define PAD(x) (((x)+3)&~3)
  16
  17 #if BYTE_ORDER == BIG_ENDIAN
  18 # define CLEANMARKER "\x19\x85\x20\x03\x00\x00\x00\x0c\xf0\x60\xdc\x98"
  19 #else
  20 # define CLEANMARKER "\x85\x19\x03\x20\x0c\x00\x00\x00\xb1\xb0\x1e\xe4"
  21 #endif
  22
  23 static int last_ino = 0;
  24 static int last_version = 0;
  25 static char *buf = NULL;
  26 static int ofs = 0;
  27 static int outfd = 0;
  28 static int mtdofs = 0;
  29 static int target_ino = 0;
  30
  31 static void prep_eraseblock(void);
  32
  33 static void pad(int size)
  34 {
  35         if ((ofs % size == 0) && (ofs < erasesize))
  36                 return;
  37
  38         if (ofs < erasesize) {
  39                 memset(buf + ofs, 0xff, (size - (ofs % size)));
  40                 ofs += (size - (ofs % size));
  41         }
  42         ofs = ofs % erasesize;
  43         if (ofs == 0) {
  44                 mtd_erase_block(outfd, mtdofs);
  45                 write(outfd, buf, erasesize);
  46                 mtdofs += erasesize;
  47         }
  48 }
  49
  50 static inline int rbytes(void)
  51 {
  52         return erasesize - (ofs % erasesize);
  53 }
  54
  55 static inline void add_data(char *ptr, int len)
  56 {
  57         if (ofs + len > erasesize) {
  58                 pad(erasesize);
  59                 prep_eraseblock();
  60         }
  61         memcpy(buf + ofs, ptr, len);
  62         ofs += len;
  63 }
  64
  65 static void prep_eraseblock(void)
  66 {
  67         if (ofs > 0)
  68                 return;
  69
  70         add_data(CLEANMARKER, sizeof(CLEANMARKER) - 1);
  71 }
  72
  73 static int add_dirent(const char *name, const char type, int parent)
  74 {
  75         struct jffs2_raw_dirent *de;
  76
  77         if (ofs - erasesize < sizeof(struct jffs2_raw_dirent) + strlen(name))
  78                 pad(erasesize);
  79
  80         prep_eraseblock();
  81         last_ino++;
  82         memset(buf + ofs, 0, sizeof(struct jffs2_raw_dirent));
  83         de = (struct jffs2_raw_dirent *) (buf + ofs);
  84
  85         de->magic = JFFS2_MAGIC_BITMASK;
  86         de->nodetype = JFFS2_NODETYPE_DIRENT;
  87         de->type = type;
  88         de->name_crc = crc32(0, name, strlen(name));
  89         de->ino = last_ino++;
  90         de->pino = parent;
  91         de->totlen = sizeof(*de) + strlen(name);
  92         de->hdr_crc = crc32(0, (void *) de, sizeof(struct jffs2_unknown_node) - 4);
  93         de->version = last_version++;
  94         de->mctime = 0;
  95         de->nsize = strlen(name);
  96         de->node_crc = crc32(0, (void *) de, sizeof(*de) - 8);
  97         memcpy(de->name, name, strlen(name));
  98
  99         ofs += sizeof(struct jffs2_raw_dirent) + de->nsize;
 100         pad(4);
 101
 102         return de->ino;
 103 }
 104
 105 static int add_dir(const char *name, int parent)
 106 {
 107         struct jffs2_raw_inode ri;
 108         int inode;
 109
 110         inode = add_dirent(name, IFTODT(S_IFDIR), parent);
 111
 112         if (rbytes() < sizeof(ri))
 113                 pad(erasesize);
 114         prep_eraseblock();
 115
 116         memset(&ri, 0, sizeof(ri));
 117         ri.magic = JFFS2_MAGIC_BITMASK;
 118         ri.nodetype = JFFS2_NODETYPE_INODE;
 119         ri.totlen = sizeof(ri);
 120         ri.hdr_crc = crc32(0, &ri, sizeof(struct jffs2_unknown_node) - 4);
 121
 122         ri.ino = inode;
 123         ri.mode = S_IFDIR | 0755;
 124         ri.uid = ri.gid = 0;
 125         ri.atime = ri.ctime = ri.mtime = 0;
 126         ri.isize = ri.csize = ri.dsize = 0;
 127         ri.version = 1;
 128         ri.node_crc = crc32(0, &ri, sizeof(ri) - 8);
 129         ri.data_crc = 0;
 130
 131         add_data((char *) &ri, sizeof(ri));
 132         pad(4);
 133         return inode;
 134 }
 135
 136 static void add_file(const char *name, int parent)
 137 {
 138         int inode, f_offset = 0, fd;
 139         struct jffs2_raw_inode ri;
 140         struct stat st;
 141         char wbuf[4096];
 142         const char *fname;
 143
 144         if (stat(name, &st)) {
 145                 fprintf(stderr, "File %s does not exist\n", name);
 146                 return;
 147         }
 148
 149         fname = strrchr(name, '/');
 150         if (fname)
 151                 fname++;
 152         else
 153                 fname = name;
 154
 155         inode = add_dirent(fname, IFTODT(S_IFREG), parent);
 156         memset(&ri, 0, sizeof(ri));
 157         ri.magic = JFFS2_MAGIC_BITMASK;
 158         ri.nodetype = JFFS2_NODETYPE_INODE;
 159
 160         ri.ino = inode;
 161         ri.mode = st.st_mode;
 162         ri.uid = ri.gid = 0;
 163         ri.atime = st.st_atime;
 164         ri.ctime = st.st_ctime;
 165         ri.mtime = st.st_mtime;
 166         ri.isize = st.st_size;
 167         ri.compr = 0;
 168         ri.usercompr = 0;
 169
 170         fd = open(name, 0);
 171         if (fd <= 0) {
 172                 fprintf(stderr, "File %s does not exist\n", name);
 173                 return;
 174         }
 175
 176         for (;;) {
 177                 int len = 0;
 178
 179                 for (;;) {
 180                         len = rbytes() - sizeof(ri);
 181                         if (len > 128)
 182                                 break;
 183
 184                         pad(erasesize);
 185                         prep_eraseblock();
 186                 }
 187
 188                 if (len > sizeof(wbuf))
 189                         len = sizeof(wbuf);
 190
 191                 len = read(fd, wbuf, len);
 192                 if (len <= 0)
 193                         break;
 194
 195                 ri.totlen = sizeof(ri) + len;
 196                 ri.hdr_crc = crc32(0, &ri, sizeof(struct jffs2_unknown_node) - 4);
 197                 ri.version = ++last_version;
 198                 ri.offset = f_offset;
 199                 ri.csize = ri.dsize = len;
 200                 ri.node_crc = crc32(0, &ri, sizeof(ri) - 8);
 201                 ri.data_crc = crc32(0, wbuf, len);
 202                 f_offset += len;
 203                 add_data((char *) &ri, sizeof(ri));
 204                 add_data(wbuf, len);
 205                 pad(4);
 206                 prep_eraseblock();
 207         }
 208
 209         close(fd);
 210 }
 211
 212 int mtd_replace_jffs2(const char *mtd, int fd, int ofs, const char *filename)
 213 {
 214         outfd = fd;
 215         mtdofs = ofs;
 216
 217         buf = malloc(erasesize);
 218         target_ino = 1;
 219         if (!last_ino)
 220                 last_ino = 1;
 221         add_file(filename, target_ino);
 222         pad(erasesize);
 223
 224         /* add eof marker, pad to eraseblock size and write the data */
 225         add_data(JFFS2_EOF, sizeof(JFFS2_EOF) - 1);
 226         pad(erasesize);
 227         free(buf);
 228
 229 #ifdef target_brcm
 230         trx_fixup(outfd, mtd);
 231 #endif
 232         return 0;
 233 }
 234
 235 void mtd_parse_jffs2data(const char *buf, const char *dir)
 236 {
 237         struct jffs2_unknown_node *node = (struct jffs2_unknown_node *) buf;
 238         unsigned int ofs = 0;
 239
 240         while (ofs < erasesize) {
 241                 node = (struct jffs2_unknown_node *) (buf + ofs);
 242                 if (node->magic != 0x1985)
 243                         break;
 244
 245                 ofs += PAD(node->totlen);
 246                 if (node->nodetype == JFFS2_NODETYPE_DIRENT) {
 247                         struct jffs2_raw_dirent *de = (struct jffs2_raw_dirent *) node;
 248
 249                         /* is this the right directory name and is it a subdirectory of / */
 250                         if (*dir && (de->pino == 1) && !strncmp((char *) de->name, dir, de->nsize))
 251                                 target_ino = de->ino;
 252
 253                         /* store the last inode and version numbers for adding extra files */
 254                         if (last_ino < de->ino)
 255                                 last_ino = de->ino;
 256                         if (last_version < de->version)
 257                                 last_version = de->version;
 258                 }
 259         }
 260 }
 261
 262 int mtd_write_jffs2(const char *mtd, const char *filename, const char *dir)
 263 {
 264         int err = -1, fdeof = 0;
 265
 266         outfd = mtd_check_open(mtd);
 267         if (!outfd)
 268                 return -1;
 269
 270         if (quiet < 2)
 271                 fprintf(stderr, "Appending %s to jffs2 partition %s\n", filename, mtd);
 272
 273         buf = malloc(erasesize);
 274         if (!buf) {
 275                 fprintf(stderr, "Out of memory!\n");
 276                 goto done;
 277         }
 278
 279         if (!*dir)
 280                 target_ino = 1;
 281
 282         /* parse the structure of the jffs2 first
 283          * locate the directory that the file is going to be placed in */
 284         for(;;) {
 285                 struct jffs2_unknown_node *node = (struct jffs2_unknown_node *) buf;
 286
 287                 if (read(outfd, buf, erasesize) != erasesize) {
 288                         fdeof = 1;
 289                         break;
 290                 }
 291                 mtdofs += erasesize;
 292
 293                 if (node->magic == 0x8519) {
 294                         fprintf(stderr, "Error: wrong endianness filesystem\n");
 295                         goto done;
 296                 }
 297
 298                 /* assume  no magic == end of filesystem
 299                  * the filesystem will probably end with be32(0xdeadc0de) */
 300                 if (node->magic != 0x1985)
 301                         break;
 302
 303                 mtd_parse_jffs2data(buf, dir);
 304         }
 305
 306         if (fdeof) {
 307                 fprintf(stderr, "Error: No room for additional data\n");
 308                 goto done;
 309         }
 310
 311         /* jump back one eraseblock */
 312         mtdofs -= erasesize;
 313         lseek(outfd, mtdofs, SEEK_SET);
 314
 315         ofs = 0;
 316
 317         if (!last_ino)
 318                 last_ino = 1;
 319
 320         if (!target_ino)
 321                 target_ino = add_dir(dir, 1);
 322
 323         add_file(filename, target_ino);
 324         pad(erasesize);
 325
 326         /* add eof marker, pad to eraseblock size and write the data */
 327         add_data(JFFS2_EOF, sizeof(JFFS2_EOF) - 1);
 328         pad(erasesize);
 329
 330         err = 0;
 331
 332 #ifdef target_brcm
 333         trx_fixup(outfd, mtd);
 334 #endif
 335
 336 done:
 337         close(outfd);
 338         if (buf)
 339                 free(buf);
 340
 341         return err;
 342 }