frontend/src/yukihane/swf/Cws2Fws.java

   1 /** $Id$ */
   2 package yukihane.swf;
   3
   4 import java.io.BufferedInputStream;
   5 import java.io.BufferedOutputStream;
   6 import java.io.File;
   7 import java.io.FileInputStream;
   8 import java.io.FileOutputStream;
   9 import java.io.IOException;
  10 import java.util.logging.Level;
  11 import java.util.logging.Logger;
  12 import java.util.zip.InflaterInputStream;
  13
  14 public class Cws2Fws {
  15
  16     private static final String CWS = "CWS";
  17     private static final String FWS = "FWS";
  18
  19     /**
  20      * \88³\8fkSWF\82©\82Ç\82¤\82©\94»\92è\82·\82é.
  21      * @param file \94»\92è\91Î\8fÛ.
  22      * @return \88³\8fkSWF\82Å\82 \82ê\82Îtrue.
  23      */
  24     public static boolean isCws(File file) {
  25         BufferedInputStream bis = null;
  26         try {
  27             bis = new BufferedInputStream(new FileInputStream(file));
  28             byte header[] = new byte[CWS.length()];
  29             bis.read(header, 0, header.length);
  30             if (CWS.equals(new String(header))) {
  31                 return true;
  32             }
  33         } catch (IOException ex) {
  34             Logger.getLogger(Cws2Fws.class.getName()).log(Level.SEVERE, null, ex);
  35         } finally {
  36             if (bis != null) {
  37                 try {
  38                     bis.close();
  39                 } catch (IOException ex) {
  40                     Logger.getLogger(Cws2Fws.class.getName()).log(Level.SEVERE, null, ex);
  41                 }
  42             }
  43         }
  44         return false;
  45     }
  46
  47     /**
  48      * \88³\8fkSWF\82ð\93W\8aJ\82·\82é.
  49      * @param in \93W\8aJ\91Î\8fÛ.
  50      * @return \93W\8aJ\8cã\82Ì\83t\83@\83C\83\8b. \91Î\8fÛ\82ª\88³\8fkSWF\82Å\82È\82¯\82ê\82Înull.
  51      */
  52     public static File createFws(File in, File out) {
  53         if (!isCws(in)) {
  54             return null;
  55         }
  56         BufferedInputStream bis = null;
  57         BufferedOutputStream bos = null;
  58         try {
  59             byte buffer[] = new byte[1024];
  60             bis = new BufferedInputStream(new FileInputStream(in));
  61             bis.read(buffer, 0, CWS.length()); // CWS
  62             bis.read(buffer, 0, 5); // \82»\82Ì\91¼\83w\83b\83_
  63
  64             bos = new BufferedOutputStream(new FileOutputStream(out));
  65             bos.write(FWS.getBytes());
  66             bos.write(buffer, 0, 5);
  67
  68             InflaterInputStream iis = new InflaterInputStream(bis);
  69             while (true) {
  70                 int res = iis.read(buffer);
  71                 if (res < 0) {
  72                     break;
  73                 }
  74                 bos.write(buffer, 0, res);
  75             }
  76             return out;
  77         } catch (IOException ex) {
  78             Logger.getLogger(Cws2Fws.class.getName()).log(Level.SEVERE, null, ex);
  79         } finally {
  80             if (bis != null) {
  81                 try {
  82                     bis.close();
  83                 } catch (IOException ex) {
  84                     Logger.getLogger(Cws2Fws.class.getName()).log(Level.SEVERE, null, ex);
  85                 }
  86             }
  87             if (bos != null) {
  88                 try {
  89                     bos.close();
  90                 } catch (IOException ex) {
  91                     Logger.getLogger(Cws2Fws.class.getName()).log(Level.SEVERE, null, ex);
  92                 }
  93             }
  94         }
  95         return null;
  96     }
  97 }