Wednesday, July 22, 2009

 

public static String unescape(String s)

{
  StringBuffer sbuf = new StringBuffer () ;
  int l  = s.length() ;
  int ch = -1 ;
  int b, sumb = 0;
  for (int i = 0, more = -1 ; i < l ; i++) {
    /* Get next byte b from URL segment s */
    switch (ch = s.charAt(i)) {
      case '%':
        ch = s.charAt (++i) ;
        int hb = (Character.isDigit ((char) ch)
                  ? ch - '0'
                  : 10+Character.toLowerCase((char) ch) - 'a') & 0xF ;
        ch = s.charAt (++i) ;
        int lb = (Character.isDigit ((char) ch)
                  ? ch - '0'
                  : 10+Character.toLowerCase ((char) ch)-'a') & 0xF ;
        b = (hb << 4) | lb ;
        break ;
      case '+':
        b = ' ' ;
        break ;
      default:
        b = ch ;
    }
    /* Decode byte b as UTF-8, sumb collects incomplete chars */
    if ((b & 0xc0) == 0x80) {                 // 10xxxxxx (continuation byte)
      sumb = (sumb << 6) | (b & 0x3f) ;       // Add 6 bits to sumb
      if (--more == 0) sbuf.append((char) sumb) ; // Add char to sbuf
    } else if ((b & 0x80) == 0x00) {          // 0xxxxxxx (yields 7 bits)
      sbuf.append((char) b) ;                 // Store in sbuf
    } else if ((b & 0xe0) == 0xc0) {          // 110xxxxx (yields 5 bits)
      sumb = b & 0x1f;
      more = 1;                               // Expect 1 more byte
    } else if ((b & 0xf0) == 0xe0) {          // 1110xxxx (yields 4 bits)
      sumb = b & 0x0f;
      more = 2;                               // Expect 2 more bytes
    } else if ((b & 0xf8) == 0xf0) {          // 11110xxx (yields 3 bits)
      sumb = b & 0x07;
      more = 3;                               // Expect 3 more bytes
    } else if ((b & 0xfc) == 0xf8) {          // 111110xx (yields 2 bits)
      sumb = b & 0x03;
      more = 4;                               // Expect 4 more bytes
    } else /*if ((b & 0xfe) == 0xfc)*/ {      // 1111110x (yields 1 bit)
      sumb = b & 0x01;
      more = 5;                               // Expect 5 more bytes
    }
    /* We don't test if the UTF-8 encoding is well-formed */
  }
  return sbuf.toString() ;
}

2 Comments:

  1. Anonymous said...
    Why the heck you are posting blog notes about BLACKBERRY on an Android planet? Please use different tags for those posts...
    razeen said...
    For Registration symbol(\u00ae), Its showing nothing

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