rpm2cpio.sh 1.4 KB

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  1. #!/bin/sh
  2. # This comes from the RPM5 5.4.0 distribution.
  3. pkg=$1
  4. if [ "$pkg" = "" -o ! -e "$pkg" ]; then
  5. echo "no package supplied" 1>&2
  6. exit 1
  7. fi
  8. leadsize=96
  9. o=`expr $leadsize + 8`
  10. set `od -j $o -N 8 -t u1 $pkg`
  11. il=`expr 256 \* \( 256 \* \( 256 \* $2 + $3 \) + $4 \) + $5`
  12. dl=`expr 256 \* \( 256 \* \( 256 \* $6 + $7 \) + $8 \) + $9`
  13. # echo "sig il: $il dl: $dl"
  14. sigsize=`expr 8 + 16 \* $il + $dl`
  15. o=`expr $o + $sigsize + \( 8 - \( $sigsize \% 8 \) \) \% 8 + 8`
  16. set `od -j $o -N 8 -t u1 $pkg`
  17. il=`expr 256 \* \( 256 \* \( 256 \* $2 + $3 \) + $4 \) + $5`
  18. dl=`expr 256 \* \( 256 \* \( 256 \* $6 + $7 \) + $8 \) + $9`
  19. # echo "hdr il: $il dl: $dl"
  20. hdrsize=`expr 8 + 16 \* $il + $dl`
  21. o=`expr $o + $hdrsize`
  22. EXTRACTOR="dd if=$pkg ibs=$o skip=1"
  23. COMPRESSION=`($EXTRACTOR |file -) 2>/dev/null`
  24. if echo $COMPRESSION |grep -iq gzip; then
  25. DECOMPRESSOR=gunzip
  26. elif echo $COMPRESSION |grep -iq bzip2; then
  27. DECOMPRESSOR=bunzip2
  28. elif echo $COMPRESSION |grep -iq xz; then
  29. DECOMPRESSOR=unxz
  30. elif echo $COMPRESSION |grep -iq cpio; then
  31. DECOMPRESSOR=cat
  32. else
  33. # Most versions of file don't support LZMA, therefore we assume
  34. # anything not detected is LZMA
  35. DECOMPRESSOR=`which unlzma 2>/dev/null`
  36. case "$DECOMPRESSOR" in
  37. /* ) ;;
  38. * ) DECOMPRESSOR=`which lzmash 2>/dev/null`
  39. case "$DECOMPRESSOR" in
  40. /* ) DECOMPRESSOR="lzmash -d -c" ;;
  41. * ) DECOMPRESSOR=cat ;;
  42. esac
  43. ;;
  44. esac
  45. fi
  46. $EXTRACTOR 2>/dev/null | $DECOMPRESSOR