package com.jcomeau.misc;

import com.jcomeau.Common;

public class RLECompressor {
 public static String decompress(String rledata) throws Exception {
  StringBuffer compressed = new StringBuffer(rledata);
  StringBuffer decompressed = new StringBuffer();
  Common.debugprintln("rledata: " + rledata);
  Common.debugprintln("compressed: " + compressed);
  for (int i = 0; i < compressed.length(); i++) {
   int j = compressed.charAt(i);
   Common.debugprintln("j: " + j);
   if (j < 0 || j > 0x7f) {  // bytes would show negative, chars more reliable
    j = j & 0x7f;
    char c = decompressed.charAt(decompressed.length() - 1);
    for (int k = 0; k <= j; k++) {
     decompressed.append(c);
    }
   } else {
    decompressed.append((char)j);
   }
  }
  return decompressed.toString();
 }
 public static void main(String[] args) throws Exception {
  Common.debugging = true;
  String test = "thi\203s is a test";
  Common.debugprintln("test: " + test);
  if (args.length > 0) {
   test = args[0];
  }
  System.out.println(decompress(test));
 }
}