#!/bin/sh

# For use in the pngzop project
# Copyright 2013 by Glenn Randers-Pehrson
# Released under the pngcrush license (equivalent to the libpng license)

# Extracts and decompresses the data from the IDAT chunks in a set of
# PNG files.

for x in $*
do
  case $1 in
      *.png)
          root=`echo $1 | sed -e "s/.png$//"`
          pngidat.exe < $1 | zpipe -d  > $root.idat
          ;;
      *.zdat)
          root=`echo $1 | sed -e "s/.zdat$//"`
          zpipe -d < $1 > $root.idat
          ;;
    esac
  shift
done