+
−/*
+
− * This C module implements the "basics" of TIFFS image analysis.
+
− */
+
−
+
−#include <sys/types.h>
+
−#include <sys/file.h>
+
−#include <sys/stat.h>
+
−#include <sys/mman.h>
+
−#include <stdio.h>
+
−#include <stdlib.h>
+
−#include <unistd.h>
+
−#include <string.h>
+
−#include <strings.h>
+
−#include "types.h"
+
−#include "struct.h"
+
−#include "globals.h"
+
−
+
−u8 tiffs_header[6] = {'F', 'f', 's', '#', 0x10, 0x02};
+
−
+
−read_ffs_image()
+
−{
+
−	int fd;
+
−	struct stat st;
+
−
+
−	fd = open(imgfile, O_RDONLY);
+
−	if (fd < 0) {
+
−		perror(imgfile);
+
−		exit(1);
+
−	}
+
−	fstat(fd, &st);
+
−	if (!S_ISREG(st.st_mode)) {
+
−		fprintf(stderr, "error: %s is not a regular file\n", imgfile);
+
−		exit(1);
+
−	}
+
−	if (st.st_size < imgfile_offset) {
+
−		fprintf(stderr,
+
−		"error: offset given with -o exceeds the size of the file\n");
+
−		exit(1);
+
−	}
+
−	if (st.st_size - imgfile_offset < total_ffs_size) {
+
−		fprintf(stderr,
+
−			"error: %s is shorter than FFS size of 0x%lx bytes\n",
+
−			imgfile, (u_long)total_ffs_size);
+
−		exit(1);
+
−	}
+
−	image = mmap(NULL, total_ffs_size, PROT_READ, MAP_PRIVATE, fd,
+
−			imgfile_offset);
+
−	if (image == MAP_FAILED) {
+
−		perror("mmap");
+
−		exit(1);
+
−	}
+
−	close(fd);
+
−}
+
−
+
−cmd_blkhdr()
+
−{
+
−	int blk;
+
−	u8 *blkhdr;
+
−
+
−	read_ffs_image();
+
−	for (blk = 0; blk < total_blocks; blk++) {
+
−		printf("Block %3d: ", blk);
+
−		blkhdr = image + blk * eraseblk_size;
+
−		if (bcmp(blkhdr, tiffs_header, sizeof tiffs_header)) {
+
−			printf("No TIFFS header\n");
+
−			continue;
+
−		}
+
−		printf("age %02X%02X, type/status %02X\n",
+
−			blkhdr[7], blkhdr[6], blkhdr[8]);
+
−	}
+
−	exit(0);
+
−}
+
−
+
−find_inode_block()
+
−{
+
−	int i, abcnt;
+
−	u8 *ptr;
+
−
+
−	if (index_blk_num >= 0) {
+
−		if (index_blk_num >= total_blocks) {
+
−			fprintf(stderr,
+
−				"invalid block # given with the -a option\n");
+
−			exit(1);
+
−		}
+
−		ptr = image + index_blk_num * eraseblk_size;
+
−		if (bcmp(ptr, tiffs_header, sizeof tiffs_header)) {
+
−			fprintf(stderr,
+
−			"error: block specified with -a has no TIFFS header\n");
+
−			exit(1);
+
−		}
+
−		if (ptr[8] != 0xAB) {
+
−			fprintf(stderr,
+
−			"error: block specified with -a is not an AB block\n");
+
−			exit(1);
+
−		}
+
−		inode_block = ptr;
+
−		return(0);
+
−	}
+
−	abcnt = 0;
+
−	for (ptr = image, i = 0; i < total_blocks; i++, ptr += eraseblk_size) {
+
−		if (bcmp(ptr, tiffs_header, sizeof tiffs_header)) {
+
−			fprintf(stderr,
+
−		"warning: no TIFFS signature in erase block #%d (offset %x)\n",
+
−				i, ptr - image);
+
−			continue;
+
−		}
+
−		switch (ptr[8]) {
+
−		case 0xAB:
+
−			if (verbose)
+
−				fprintf(stderr,
+
−			"Found AB index in erase block #%d (offset %x)\n",
+
−					i, ptr - image);
+
−			index_blk_num = i;
+
−			inode_block = ptr;
+
−			abcnt++;
+
−			continue;
+
−		case 0xBD:
+
−		case 0xBF:
+
−			continue;
+
−		}
+
−		fprintf(stderr,
+
−		"warning: unexpected block type/status %02X at offset %x\n",
+
−			ptr[8], ptr - image);
+
−	}
+
−	if (!inode_block) {
+
−		fprintf(stderr,
+
−			"error: could not find an active inode block in %s\n",
+
−			imgfile);
+
−		exit(1);
+
−	}
+
−	if (abcnt > 1) {
+
−		fprintf(stderr,
+
−			"error: found more than one AB block; use -a\n");
+
−		exit(1);
+
−	}
+
−	return(0);
+
−}
+
−
+
−cmd_fsinfo()
+
−{
+
−	read_ffs_image();
+
−	find_inode_block();
+
−	printf("Active inode block (AB) is block #%d\n", index_blk_num);
+
−	alloc_inode_table();
+
−	find_root_inode();
+
−	printf("Root inode is #%x\n", root_inode);
+
−	if (validate_obj_name(root_inode, 1)) {
+
−		printf("Root inode (format) name: %s\n",
+
−			inode_info[root_inode]->dataptr);
+
−		exit(0);
+
−	} else {
+
−		printf("No valid name found in the root inode!\n");
+
−		exit(1);
+
−	}
+
−}