ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/scripts/functions.sh b/scripts/functions.sh
new file mode 100644
index 0000000..ec0618c
--- /dev/null
+++ b/scripts/functions.sh
@@ -0,0 +1,48 @@
+#!/bin/sh
+
+
+get_magic_word() {
+ dd if=$1 bs=4 count=1 2>/dev/null | od -A n -N 4 -t x1 | tr -d ' '
+}
+
+get_post_padding_word() {
+ local rootfs_length="$(stat -c%s "$1")"
+ [ "$rootfs_length" -ge 4 ] || return
+ rootfs_length=$((rootfs_length-4))
+
+ # the JFFS2 end marker must be on a 4K boundary (often 64K or 256K)
+ local unaligned_bytes=$((rootfs_length%4096))
+ [ "$unaligned_bytes" = 0 ] || return
+
+ # skip rootfs data except the potential EOF marker
+ dd if="$1" bs=1 skip="$rootfs_length" 2>/dev/null | od -A n -N 4 -t x1 | tr -d ' '
+}
+
+get_fs_type() {
+ local magic_word="$(get_magic_word "$1")"
+
+ case "$magic_word" in
+ "3118"*)
+ echo "ubifs"
+ ;;
+ "68737173")
+ local post_padding_word="$(get_post_padding_word "$1")"
+
+ case "$post_padding_word" in
+ "deadc0de")
+ echo "squashfs-jffs2"
+ ;;
+ *)
+ echo "squashfs"
+ ;;
+ esac
+ ;;
+ *)
+ echo "unknown"
+ ;;
+ esac
+}
+
+round_up() {
+ echo "$(((($1 + ($2 - 1))/ $2) * $2))"
+}