39 lines
1.2 KiB
Bash
Executable File
39 lines
1.2 KiB
Bash
Executable File
#!/bin/sh
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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 + $hdrsize`
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comp=`dd if="$pkg" ibs=$o skip=1 count=1 2>/dev/null \
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| dd bs=3 count=1 2>/dev/null`
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gz="`echo . | awk '{ printf("%c%c", 0x1f, 0x8b); }'`"
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lzma="`echo . | awk '{ printf("%cLZ", 0xff); }'`"
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xz="`echo . | awk '{ printf("%c7z", 0xfd); }'`"
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case "$comp" in
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BZh) dd if="$pkg" ibs=$o skip=1 2>/dev/null | bunzip2 ;;
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"$gz"*) dd if="$pkg" ibs=$o skip=1 2>/dev/null | gunzip ;;
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"$xz"*) dd if="$pkg" ibs=$o skip=1 2>/dev/null | xzcat ;;
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"$lzma"*) dd if="$pkg" ibs=$o skip=1 2>/dev/null | unlzma ;;
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*) echo "Unrecognized rpm file: $pkg"; exit 1 ;;
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esac
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