| #!/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 |