/usr/lib/rpm/rpm2cpio.sh is in rpm 4.12.0.1+dfsg1-3build3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | #!/bin/sh
# Prevent gawk >= 4.0.x from getting funny ideas wrt UTF in printf()
LANG=C
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 + $hdrsize`
comp=`dd if="$pkg" ibs=$o skip=1 count=1 2>/dev/null \
| dd bs=3 count=1 2>/dev/null`
gz="`echo . | awk '{ printf("%c%c", 0x1f, 0x8b); }'`"
lzma="`echo . | awk '{ printf("%cLZ", 0xff); }'`"
xz="`echo . | awk '{ printf("%c7z", 0xfd); }'`"
case "$comp" in
BZh) dd if="$pkg" ibs=$o skip=1 2>/dev/null | bunzip2 ;;
"$gz"*) dd if="$pkg" ibs=$o skip=1 2>/dev/null | gunzip ;;
"$xz"*) dd if="$pkg" ibs=$o skip=1 2>/dev/null | xzcat ;;
"$lzma"*) dd if="$pkg" ibs=$o skip=1 2>/dev/null | unlzma ;;
*) echo "Unrecognized rpm file: $pkg"; exit 1 ;;
esac
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