Patrick Williams | c124f4f | 2015-09-15 14:41:29 -0500 | [diff] [blame] | 1 | #!/bin/sh |
| 2 | |
| 3 | # Prevent gawk >= 4.0.x from getting funny ideas wrt UTF in printf() |
| 4 | LANG=C |
| 5 | |
| 6 | pkg=$1 |
| 7 | if [ "$pkg" = "" -o ! -e "$pkg" ]; then |
| 8 | echo "no package supplied" 1>&2 |
| 9 | exit 1 |
| 10 | fi |
| 11 | |
| 12 | leadsize=96 |
| 13 | o=`expr $leadsize + 8` |
| 14 | set `od -j $o -N 8 -t u1 $pkg` |
| 15 | il=`expr 256 \* \( 256 \* \( 256 \* $2 + $3 \) + $4 \) + $5` |
| 16 | dl=`expr 256 \* \( 256 \* \( 256 \* $6 + $7 \) + $8 \) + $9` |
| 17 | # echo "sig il: $il dl: $dl" |
| 18 | |
| 19 | sigsize=`expr 8 + 16 \* $il + $dl` |
| 20 | o=`expr $o + $sigsize + \( 8 - \( $sigsize \% 8 \) \) \% 8 + 8` |
| 21 | set `od -j $o -N 8 -t u1 $pkg` |
| 22 | il=`expr 256 \* \( 256 \* \( 256 \* $2 + $3 \) + $4 \) + $5` |
| 23 | dl=`expr 256 \* \( 256 \* \( 256 \* $6 + $7 \) + $8 \) + $9` |
| 24 | # echo "hdr il: $il dl: $dl" |
| 25 | |
| 26 | hdrsize=`expr 8 + 16 \* $il + $dl` |
| 27 | o=`expr $o + $hdrsize` |
| 28 | comp=`dd if=$pkg ibs=$o skip=1 count=1 2>/dev/null | dd bs=3 count=1 2> /dev/null` |
| 29 | |
| 30 | gz="`echo . | awk '{ printf("%c%c", 0x1f, 0x8b); }'`" |
| 31 | lzma="`echo . | awk '{ printf("%cLZ", 0xff); }'`" |
| 32 | xz="`echo . | awk '{ printf("%c7z", 0xfd); }'`" |
| 33 | case "$comp" in |
| 34 | BZh) dd if="$pkg" ibs=$o skip=1 2>/dev/null | bunzip2 ;; |
| 35 | "$gz"*) dd if="$pkg" ibs=$o skip=1 2>/dev/null | gunzip ;; |
| 36 | "$xz"*) dd if="$pkg" ibs=$o skip=1 2>/dev/null | xzcat ;; |
| 37 | "$lzma"*) dd if="$pkg" ibs=$o skip=1 2>/dev/null | unlzma ;; |
| 38 | *) echo "Unrecognized rpm file: $pkg"; exit 1 ;; |
| 39 | esac |