--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ffstools/tiffs-rd/basics.c	Sat Jan 25 23:56:47 2014 +0000
@@ -0,0 +1,74 @@
+/*
+ * 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"
+
+u8 tiffs_header[6] = {'F', 'f', 's', '#', 0x10, 0x02};
+u8 blank_flash_line[16] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+			   0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
+
+extern char *imgfile;
+extern u32 eraseblk_size;
+extern int total_blocks;
+extern u32 total_ffs_size;
+extern int index_blk_num, root_node_no;
+extern int verbose;
+
+u_char *image;
+
+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 < 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, 0);
+	if (image == MAP_FAILED) {
+		perror("mmap");
+		exit(1);
+	}
+}
+
+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);
+}