29 lines
581 B
Bash
29 lines
581 B
Bash
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#!/bin/bash -e
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INPUT=$1
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OUTPUT=$2
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SIZE=$3
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BUF=$4
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if [ ! -e "$INPUT" ]; then
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echo "ERROR: No input file \"$INPUT\""
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exit 1
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fi
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if [ "$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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rm -rf "$OUTPUT"
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dd if="$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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