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- #!/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 -iq gzip; then
- DECOMPRESSOR=gunzip
- elif echo $COMPRESSION |grep -iq bzip2; then
- DECOMPRESSOR=bunzip2
- elif echo $COMPRESSION |grep -iq xz; then
- DECOMPRESSOR=unxz
- elif echo $COMPRESSION |grep -iq cpio; then
- DECOMPRESSOR=cat
- else
- # Most versions of file don't support LZMA, therefore we assume
- # anything not detected is LZMA
- DECOMPRESSOR=`which unlzma 2>/dev/null`
- case "$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
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