Blogger Scott
          

          

          

          
	
					
	
          
		
          
			一個utf8轉換程序
		
          
		據說是一個通用的手機上使用的UTF8轉換程序，先記下來。
          

          

           1private final String readUnicodeFileUTF8(String filename) {
          
           2        StringBuffer sb = new StringBuffer(256);
          
           3        try {
          
           4            int[] surrogatePair = new int[2];
          
           5            InputStream is = this.getClass().getResourceAsStream(filename);
          
           6
          
           7            int val = 0;
          
           8            int unicharCount = 0;
          
           9            while ((val = readNextCharFromStreamUTF8(is))!=-1) {
          
          10                unicharCount++;
          
          11                if (val <= 0xFFFF) {
          
          12                    // if first value is the Byte Order Mark (BOM), do not add
          
          13                    if (! (unicharCount == 1 && val == 0xFEFF)) {
          
          14                        sb.append((char)val);
          
          15                    }
          
          16                }           else {
          
          17                    supplementCodePointToSurrogatePair(val, surrogatePair);
          
          18                    sb.append((char)surrogatePair[0]);
          
          19                    sb.append((char)surrogatePair[1]);
          
          20                }
          
          21            }
          
          22            is.close();
          
          23        }           catch (Exception e) {};
          
          24
          
          25        return new String(sb);
          
          26    }
          
          27   
          
          28    private final static int readNextCharFromStreamUTF8(InputStream is) {
          
          29        int c = -1;
          
          30        if (is==null) return c;
          
          31        boolean complete = false;
          
          32       
          
          33        try {
          
          34            int byteVal;
          
          35            int expecting=0;
          
          36            int composedVal=0;
          
          37           
          
          38            while (!complete && (byteVal = is.read()) != -1) {
          
          39                if (expecting > 0 && (byteVal & 0xC0) == 0x80) {  /* 10xxxxxx */
          
          40                    expecting--;
          
          41                    composedVal = composedVal | ((byteVal & 0x3F) << (expecting*6));
          
          42                    if (expecting == 0) {
          
          43                        c = composedVal;
          
          44                        complete = true;
          
          45                        //System.out.println("appending: U+" + Integer.toHexString(composedVal) );
          
          46                    }
          
          47                }           else {
          
          48                    composedVal = 0;
          
          49                    expecting = 0;
          
          50                    if ((byteVal & 0x80) == 0) {    /* 0xxxxxxx */
          
          51                        // one byte character, no extending byte expected
          
          52                        c = byteVal;
          
          53                        complete = true;
          
          54                        //System.out.println("appending: U+" + Integer.toHexString(byteVal) );
          
          55                    }           else if ((byteVal & 0xE0) == 0xC0) {  /* 110xxxxx */
          
          56                        expecting = 1;  // expecting 1 extending byte
          
          57                        composedVal = ((byteVal & 0x1F) << 6);
          
          58                    }           else if ((byteVal & 0xF0) == 0xE0) {  /* 1110xxxx */
          
          59                        expecting = 2;  // expecting 2 extending bytes
          
          60                        composedVal = ((byteVal & 0x0F) << 12);
          
          61                    }           else if ((byteVal & 0xF8) == 0xF0) {  /* 11110xxx */
          
          62                        expecting = 3;  // expecting 3 extending bytes
          
          63                        composedVal = ((byteVal & 0x07) << 18);
          
          64                    }           else {
          
          65                        // non conformant utf-8, ignore or catch error
          
          66                    }
          
          67                }
          
          68            }
          
          69           
          
          70        }           catch (Exception e) {
          
          71            System.out.println(e.toString());
          
          72        }
          
          73       
          
          74        return c;
          
          75    }
          
          76
          
          77    private final static void supplementCodePointToSurrogatePair(int codePoint, int[] surrogatePair) {
          
          78        int high4 = ((codePoint >> 16) & 0x1F) - 1;
          
          79        int mid6 = ((codePoint >> 10) & 0x3F);
          
          80        int low10 = codePoint & 0x3FF;
          
          81
          
          82        surrogatePair[0] = (0xD800 | (high4 << 6) | (mid6));
          
          83        surrogatePair[1] = (0xDC00 | (low10));
          
          84    }
          
		
          
			posted on 2009-06-07 16:37 江天部落格 閱讀(298) 評論(0)  編輯  收藏  所屬分類: Android 、Java 
		
          
	
          
	
	





          
	    
    




          








          

				
	


          




    







          
        
	




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