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         FILE *f;
 144
 145         if (stat(name, &st)) {
 146                 fprintf(stderr, "File %s does not exist\n", name);
 147                 return;
 148         }
 149
 150         fname = strrchr(name, '/');
 151         if (fname)
 152                 fname++;
 153         else
 154                 fname = name;
 155
 156         inode = add_dirent(fname, IFTODT(S_IFREG), parent);
 157         memset(&ri, 0, sizeof(ri));
 158         ri.magic = JFFS2_MAGIC_BITMASK;
 159         ri.nodetype = JFFS2_NODETYPE_INODE;
 160
 161         ri.ino = inode;
 162         ri.mode = st.st_mode;
 163         ri.uid = ri.gid = 0;
 164         ri.atime = st.st_atime;
 165         ri.ctime = st.st_ctime;
 166         ri.mtime = st.st_mtime;
 167         ri.isize = st.st_size;
 168         ri.compr = 0;
 169         ri.usercompr = 0;
 170
 171         fd = open(name, 0);
 172         if (fd <= 0) {
 173                 fprintf(stderr, "File %s does not exist\n", name);
 174                 return;
 175         }
 176
 177         for (;;) {
 178                 int len = 0;
 179
 180                 for (;;) {
 181                         len = rbytes() - sizeof(ri);
 182                         if (len > 128)
 183                                 break;
 184
 185                         pad(erasesize);
 186                         prep_eraseblock();
 187                 }
 188
 189                 if (len > sizeof(wbuf))
 190                         len = sizeof(wbuf);
 191
 192                 len = read(fd, wbuf, len);
 193                 if (len <= 0)
 194                         break;
 195
 196                 ri.totlen = sizeof(ri) + len;
 197                 ri.hdr_crc = crc32(0, &ri, sizeof(struct jffs2_unknown_node) - 4);
 198                 ri.version = ++last_version;
 199                 ri.offset = f_offset;
 200                 ri.csize = ri.dsize = len;
 201                 ri.node_crc = crc32(0, &ri, sizeof(ri) - 8);
 202                 ri.data_crc = crc32(0, wbuf, len);
 203                 f_offset += len;
 204                 add_data((char *) &ri, sizeof(ri));
 205                 add_data(wbuf, len);
 206                 pad(4);
 207                 prep_eraseblock();
 208         }
 209
 210         close(fd);
 211 }
 212
 213 int mtd_replace_jffs2(int fd, int ofs, const char *filename)
 214 {
 215         outfd = fd;
 216         mtdofs = ofs;
 217
 218         buf = malloc(erasesize);
 219         target_ino = 1;
 220         if (!last_ino)
 221                 last_ino = 1;
 222         add_file(filename, target_ino);
 223         pad(erasesize);
 224
 225         /* add eof marker, pad to eraseblock size and write the data */
 226         add_data(JFFS2_EOF, sizeof(JFFS2_EOF) - 1);
 227         pad(erasesize);
 228         free(buf);
 229 }
 230
 231 void mtd_parse_jffs2data(const char *buf, const char *dir)
 232 {
 233         struct jffs2_unknown_node *node = (struct jffs2_unknown_node *) buf;
 234         unsigned int ofs = 0;
 235
 236         while (ofs < erasesize) {
 237                 node = (struct jffs2_unknown_node *) (buf + ofs);
 238                 if (node->magic != 0x1985)
 239                         break;
 240
 241                 ofs += PAD(node->totlen);
 242                 if (node->nodetype == JFFS2_NODETYPE_DIRENT) {
 243                         struct jffs2_raw_dirent *de = (struct jffs2_raw_dirent *) node;
 244
 245                         /* is this the right directory name and is it a subdirectory of / */
 246                         if (*dir && (de->pino == 1) && !strncmp(de->name, dir, de->nsize))
 247                                 target_ino = de->ino;
 248
 249                         /* store the last inode and version numbers for adding extra files */
 250                         if (last_ino < de->ino)
 251                                 last_ino = de->ino;
 252                         if (last_version < de->version)
 253                                 last_version = de->version;
 254                 }
 255         }
 256 }
 257
 258 int mtd_write_jffs2(const char *mtd, const char *filename, const char *dir)
 259 {
 260         int err = -1, fdeof = 0;
 261         off_t offset;
 262
 263         outfd = mtd_check_open(mtd);
 264         if (!outfd)
 265                 return -1;
 266
 267         if (quiet < 2)
 268                 fprintf(stderr, "Appending %s to jffs2 partition %s\n", filename, mtd);
 269
 270         buf = malloc(erasesize);
 271         if (!buf) {
 272                 fprintf(stderr, "Out of memory!\n");
 273                 goto done;
 274         }
 275
 276         if (!*dir)
 277                 target_ino = 1;
 278
 279         /* parse the structure of the jffs2 first
 280          * locate the directory that the file is going to be placed in */
 281         for(;;) {
 282                 struct jffs2_unknown_node *node = (struct jffs2_unknown_node *) buf;
 283
 284                 if (read(outfd, buf, erasesize) != erasesize) {
 285                         fdeof = 1;
 286                         break;
 287                 }
 288                 mtdofs += erasesize;
 289
 290                 if (node->magic == 0x8519) {
 291                         fprintf(stderr, "Error: wrong endianness filesystem\n");
 292                         goto done;
 293                 }
 294
 295                 /* assume  no magic == end of filesystem
 296                  * the filesystem will probably end with be32(0xdeadc0de) */
 297                 if (node->magic != 0x1985)
 298                         break;
 299
 300                 mtd_parse_jffs2data(buf, dir);
 301         }
 302
 303         if (fdeof) {
 304                 fprintf(stderr, "Error: No room for additional data\n");
 305                 goto done;
 306         }
 307
 308         /* jump back one eraseblock */
 309         mtdofs -= erasesize;
 310         lseek(outfd, mtdofs, SEEK_SET);
 311
 312         ofs = 0;
 313
 314         if (!last_ino)
 315                 last_ino = 1;
 316
 317         if (!target_ino)
 318                 target_ino = add_dir(dir, 1);
 319
 320         add_file(filename, target_ino);
 321         pad(erasesize);
 322
 323         /* add eof marker, pad to eraseblock size and write the data */
 324         add_data(JFFS2_EOF, sizeof(JFFS2_EOF) - 1);
 325         pad(erasesize);
 326
 327         err = 0;
 328
 329 done:
 330         close(outfd);
 331         if (buf)
 332                 free(buf);
 333
 334         return err;
 335 }