#!/bin/bash
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set -ex
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INPUT=$1
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OUTPUT=$2
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SIZE=$3
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BUF=$4
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COMMON_DIR=$(dirname $(readlink -f $0))
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ROCKIMG_DIR=${COMMON_DIR}/../rockimg
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if [ ! -e ${INPUT} ]; then
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echo "ERROR: No input file \"${INPUT}\""
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exit -1
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fi
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rm ${ROCKIMG_DIR}/${OUTPUT} || true
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if [ ${SIZE} -gt 1024 ]; then
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echo "ERROR: SIZE bigger than 1K"
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exit -1
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fi
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BIG_END=$[SIZE / 256]
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LIT_END=$[SIZE - (BIG_END * 256)]
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BIG_END=$(echo "ibase=10;obase=16;${BIG_END}" | bc)
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LIT_END=$(echo "ibase=10;obase=16;${LIT_END}" | bc)
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dd if=${INPUT} of=${OUTPUT} bs=1k count=10
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echo -en "\x${LIT_END}\x${BIG_END}" >> ${OUTPUT}
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echo -n "$BUF" >> ${OUTPUT}
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SKIP=$[10 * 1024 + SIZE + 2]
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dd if=${INPUT} of=${OUTPUT} seek=${SKIP} skip=${SKIP} bs=1
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