54 lines
1.4 KiB
Bash
54 lines
1.4 KiB
Bash
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#!/bin/sh
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# This comes from the RPM5 5.4.0 distribution.
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pkg=$1
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if [ "$pkg" = "" -o ! -e "$pkg" ]; then
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echo "no package supplied" 1>&2
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exit 1
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fi
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leadsize=96
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o=`expr $leadsize + 8`
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set `od -j $o -N 8 -t u1 $pkg`
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il=`expr 256 \* \( 256 \* \( 256 \* $2 + $3 \) + $4 \) + $5`
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dl=`expr 256 \* \( 256 \* \( 256 \* $6 + $7 \) + $8 \) + $9`
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# echo "sig il: $il dl: $dl"
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sigsize=`expr 8 + 16 \* $il + $dl`
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o=`expr $o + $sigsize + \( 8 - \( $sigsize \% 8 \) \) \% 8 + 8`
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set `od -j $o -N 8 -t u1 $pkg`
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il=`expr 256 \* \( 256 \* \( 256 \* $2 + $3 \) + $4 \) + $5`
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dl=`expr 256 \* \( 256 \* \( 256 \* $6 + $7 \) + $8 \) + $9`
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# echo "hdr il: $il dl: $dl"
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hdrsize=`expr 8 + 16 \* $il + $dl`
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o=`expr $o + $hdrsize`
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EXTRACTOR="dd if=$pkg ibs=$o skip=1"
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COMPRESSION=`($EXTRACTOR |file -) 2>/dev/null`
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if echo $COMPRESSION |grep -iq gzip; then
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DECOMPRESSOR=gunzip
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elif echo $COMPRESSION |grep -iq bzip2; then
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DECOMPRESSOR=bunzip2
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elif echo $COMPRESSION |grep -iq xz; then
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DECOMPRESSOR=unxz
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elif echo $COMPRESSION |grep -iq cpio; then
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DECOMPRESSOR=cat
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else
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# Most versions of file don't support LZMA, therefore we assume
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# anything not detected is LZMA
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DECOMPRESSOR=`which unlzma 2>/dev/null`
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case "$DECOMPRESSOR" in
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/* ) ;;
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* ) DECOMPRESSOR=`which lzmash 2>/dev/null`
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case "$DECOMPRESSOR" in
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/* ) DECOMPRESSOR="lzmash -d -c" ;;
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* ) DECOMPRESSOR=cat ;;
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esac
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;;
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esac
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fi
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$EXTRACTOR 2>/dev/null | $DECOMPRESSOR
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