0cba744dde
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49 lines
931 B
Bash
49 lines
931 B
Bash
#!/bin/sh
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get_magic_word() {
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dd if=$1 bs=4 count=1 2>/dev/null | od -A n -N 4 -t x1 | tr -d ' '
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}
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get_post_padding_word() {
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local rootfs_length="$(stat -c%s "$1")"
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[ "$rootfs_length" -ge 4 ] || return
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rootfs_length=$((rootfs_length-4))
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# the JFFS2 end marker must be on a 4K boundary (often 64K or 256K)
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local unaligned_bytes=$((rootfs_length%4096))
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[ "$unaligned_bytes" = 0 ] || return
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# skip rootfs data except the potential EOF marker
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dd if="$1" bs=1 skip="$rootfs_length" 2>/dev/null | od -A n -N 4 -t x1 | tr -d ' '
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}
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get_fs_type() {
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local magic_word="$(get_magic_word "$1")"
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case "$magic_word" in
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"3118"*)
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echo "ubifs"
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;;
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"68737173")
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local post_padding_word="$(get_post_padding_word "$1")"
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case "$post_padding_word" in
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"deadc0de")
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echo "squashfs-jffs2"
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;;
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*)
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echo "squashfs"
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;;
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esac
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;;
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*)
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echo "unknown"
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;;
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esac
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}
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round_up() {
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echo "$(((($1 + ($2 - 1))/ $2) * $2))"
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}
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