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 org.slf4j.Logger;
  11 import org.slf4j.LoggerFactory;
  12 import java.util.zip.InflaterInputStream;
  13
  14 public class Cws2Fws {
  15
  16     private static final Logger logger = LoggerFactory.getLogger(Cws2Fws.class);
  17     private static final String CWS = "CWS";
  18     private static final String FWS = "FWS";
  19
  20     /**
  21      * 圧縮SWFかどうか判定する.
  22      * @param file 判定対象.
  23      * @return 圧縮SWFであればtrue.
  24      */
  25     public static boolean isCws(File file) {
  26         BufferedInputStream bis = null;
  27         try {
  28             bis = new BufferedInputStream(new FileInputStream(file));
  29             byte header[] = new byte[CWS.length()];
  30             bis.read(header, 0, header.length);
  31             if (CWS.equals(new String(header))) {
  32                 return true;
  33             }
  34         } catch (IOException ex) {
  35             logger.error(null, ex);
  36         } finally {
  37             if (bis != null) {
  38                 try {
  39                     bis.close();
  40                 } catch (IOException ex) {
  41                     logger.error(null, ex);
  42                 }
  43             }
  44         }
  45         return false;
  46     }
  47
  48     /**
  49      * 圧縮SWFを展開する.
  50      * @param in 展開対象.
  51      * @return 展開後のファイル. 対象が圧縮SWFでなければnull.
  52      */
  53     public static File createFws(File in, File out) {
  54         if (!isCws(in)) {
  55             return null;
  56         }
  57         BufferedInputStream bis = null;
  58         BufferedOutputStream bos = null;
  59         try {
  60             byte buffer[] = new byte[1024];
  61             bis = new BufferedInputStream(new FileInputStream(in));
  62             bis.read(buffer, 0, CWS.length()); // CWS
  63             bis.read(buffer, 0, 5); // その他ヘッダ
  64
  65             bos = new BufferedOutputStream(new FileOutputStream(out));
  66             bos.write(FWS.getBytes());
  67             bos.write(buffer, 0, 5);
  68
  69             InflaterInputStream iis = new InflaterInputStream(bis);
  70             while (true) {
  71                 int res = iis.read(buffer);
  72                 if (res < 0) {
  73                     break;
  74                 }
  75                 bos.write(buffer, 0, res);
  76             }
  77             return out;
  78         } catch (IOException ex) {
  79             logger.error(null, ex);
  80         } finally {
  81             if (bis != null) {
  82                 try {
  83                     bis.close();
  84                 } catch (IOException ex) {
  85                     logger.error(null, ex);
  86                 }
  87             }
  88             if (bos != null) {
  89                 try {
  90                     bos.close();
  91                 } catch (IOException ex) {
  92                     logger.error(null, ex);
  93                 }
  94             }
  95         }
  96         return null;
  97     }
  98 }