FreeCalypso > hg > freecalypso-sw
view ffstools/tiffs-rd/inode.c @ 528:1affe428bf72
getting closer to compiling l1_cust.c
author | Michael Spacefalcon <msokolov@ivan.Harhan.ORG> |
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date | Tue, 15 Jul 2014 16:54:52 +0000 |
parents | 024042383a26 |
children | 09b8b2327838 |
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/* * This C module implements the reading and decoding of inode information. */ #include <sys/types.h> #include <endian.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <strings.h> #include "types.h" #include "struct.h" #include "globals.h" u8 blank_flash_line[16] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}; alloc_inode_table() { inode_info = malloc(sizeof(struct inode_info *) * inode_limit); if (!inode_info) { perror("malloc of inode table"); exit(1); } bzero(inode_info, sizeof(struct inode_info *) * inode_limit); } static int convert_ptr(in, infp) int in; int *infp; { if (in == 0xFFFF) { *infp = 0; return(0); } if (in < 1 || in >= inode_limit) return(-1); *infp = in; return(1); } validate_inode(ino) { struct inode_flash *fl; struct inode_info *inf; if (ino < 1 || ino >= inode_limit) return(0); if (inode_info[ino]) return(1); fl = (struct inode_flash *)inode_block + ino; if (!bcmp(fl, blank_flash_line, sizeof blank_flash_line)) return(0); inf = malloc(sizeof(struct inode_info)); if (!inf) { perror("malloc of struct inode_info"); exit(1); } bzero(inf, sizeof(struct inode_info)); inf->ino = ino; inf->len = le16toh(fl->len); if (inf->len & 0xF) { fprintf(stderr, "warning: inode #%x: invalid length, skipping\n", ino); free(inf); return(0); } inf->type = fl->type; switch (inf->type) { case 0x00: break; case 0xE1: case 0xF1: case 0xF2: case 0xF3: case 0xF4: if (!inf->len) { fprintf(stderr, "warning: inode #%x: non-deleted object has zero length, skipping\n", ino); free(inf); return(0); } break; default: fprintf(stderr, "warning: inode #%x: unexpected object type %02X, skipping\n", ino, inf->type); free(inf); return(0); } if (convert_ptr(le16toh(fl->descend), &inf->descend) < 0) { fprintf(stderr, "warning: inode #%x: invalid descend pointer, skipping\n", ino); free(inf); return(0); } if (convert_ptr(le16toh(fl->sibling), &inf->sibling) < 0) { fprintf(stderr, "warning: inode #%x: invalid sibling pointer, skipping\n", ino); free(inf); return(0); } if (inf->len) { inf->rawloc = le32toh(fl->dataptr); if (inf->rawloc > 0x0FFFFFFF) { invdptr: fprintf(stderr, "warning: inode #%x: invalid data pointer, skipping\n", ino); free(inf); return(0); } inf->offset = inf->rawloc << 4; if (inf->offset >= total_ffs_size) goto invdptr; if (inf->offset + inf->len > total_ffs_size) { fprintf(stderr, "warning: inode #%x: data pointer + length > FFS total size, skipping\n", ino); free(inf); return(0); } inf->dataptr = image + inf->offset; } inode_info[ino] = inf; return(1); } find_root_inode() { int ino; if (root_inode) { if (!validate_inode(root_inode)) { fprintf(stderr, "error: root inode specified with -r is invalid\n"); exit(1); } return(1); } for (ino = 1; ino < inode_limit; ino++) { if (!validate_inode(ino)) continue; if (inode_info[ino]->type != 0xF2) continue; if (*inode_info[ino]->dataptr != '/') continue; root_inode = ino; if (verbose) fprintf(stderr, "Found root inode at #%x\n", ino); if (inode_info[ino]->sibling) fprintf(stderr, "warning: root inode #%x has a non-null sibling pointer\n", ino); return(0); } fprintf(stderr, "error: no root inode found; try -r\n"); exit(1); }