1 files changed, 79 insertions, 0 deletions
diff --git a/2003/firmware-reveng-ccc2003/magic_ofs.c b/2003/firmware-reveng-ccc2003/magic_ofs.c
new file mode 100644
index 0000000..a83f593
--- /dev/null
+++ b/2003/firmware-reveng-ccc2003/magic_ofs.c
@@ -0,0 +1,79 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+
+#include <magic.h>
+
+/* magic_ofs - check for 'file' magic at any possible offset within a file
+ *
+ * (C) 2003 by Harald Welte <laforge@gnumonks.org>
+ *
+ * This code is subject to the GNU GPL v2
+ */
+
+int main(int argc, char **argv)
+{
+	struct stat st;
+	magic_t cookie;
+	int fd;
+	off_t i;
+	void *mem;
+
+	if (argc < 2) {
+		fprintf(stderr, "you have to name a file\n");
+		exit(2);
+	}
+
+	if (!strlen(argv[1])) {
+		fprintf(stderr, "empty argument\n");
+		exit(2);
+	}
+
+	fd = open(argv[1], 0);
+	if (fd < 0) {
+		fprintf(stderr, "unable to open file\n");
+		exit(1);
+	}
+
+	if (fstat(fd, &st)) {
+		fprintf(stderr, "unable to stat file\n");
+		exit(1);
+	}
+
+	mem = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, (off_t ) 0);
+	if (!mem) {
+		fprintf(stderr, "unable to mmap file\n");
+		exit(1);
+	}
+	
+	cookie = magic_open(MAGIC_CONTINUE);
+	if (!cookie) {
+		fprintf(stderr, "error opening libmagic\n");
+		exit(1);
+	}
+
+	if (magic_load(cookie, NULL)) {
+		fprintf(stderr, "error during magic_load\n");
+		magic_close(cookie);
+		exit(1);
+	}
+
+	for (i = 0; i < st.st_size; i++) {
+		const char *desc;
+		desc = magic_buffer(cookie, mem+i, st.st_size - i);
+		if (!desc) {
+			break;
+		}
+		if (!strcmp(desc, "data")) {
+			continue;
+		}
+		printf("%8.8u: %s\n", i, desc);
+	}
+
+	magic_close(cookie);
+	exit(0);
+}