13 lines
327 B
Bash
13 lines
327 B
Bash
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#!/bin/sh
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setbyte() {
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printf "\x$3"|dd status=none seek="$2" bs=1 count=1 conv=notrunc of="$1"
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}
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[ -n "$1" ] || exit 1
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setbyte "$1" 2 $(stat -c "%s" "$1"|awk '{printf("%02x",$1/512)}')
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setbyte "$1" 41 00
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checksum=$(xxd -p -c 1 "$1"|sed 's/^/0x/'|awk '{s+=$1} END {printf("%02x\n",256-s%256)}')
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setbyte "$1" 41 "$checksum"
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