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