libjava/gnu/gcj/convert/Output_JavaSrc.java

   1 /* Copyright (C) 1999  Free Software Foundation
   2
   3    This file is part of libgcj.
   4
   5 This software is copyrighted work licensed under the terms of the
   6 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
   7 details.  */
   8
   9 package gnu.gcj.convert;
  10
  11 /**
  12  * Convert Unicode to Ascii with \ u XXXX-escapes.
  13  * @author Per Bothner <bothner@cygnus.com>
  14  * @date April 1999.
  15  */
  16
  17 public class Output_JavaSrc extends UnicodeToBytes
  18 {
  19   public String getName() { return "JavaSrc"; }
  20
  21   // Number of bytes remaining before pending_char has been written.
  22   int todo;
  23  int pending_char;
  24
  25   public int write (char[] inbuffer, int inpos, int inlength)
  26   {
  27     int start_pos = inpos;
  28     int avail = buf.length - count;
  29     for (;;)
  30       {
  31         if (avail == 0)
  32           break;
  33         switch (todo)
  34           {
  35           case 1:
  36             if (pending_char == '\\')
  37               {
  38                 buf[count++] = (byte) '\\';
  39                 avail--;
  40                 todo = 0;
  41                 continue;
  42               }
  43             /* ... else fall through ... */
  44           case 2:
  45           case 3:
  46           case 4:
  47             todo--;
  48             int digit = ((int) pending_char >> (todo * 4)) & 0xF;
  49             buf[count++] = (byte) Character.forDigit(digit, 16);
  50             avail--;
  51             continue;
  52           case 5:
  53             buf[count++] = (byte) 'u';
  54             avail--;
  55             todo = 4;
  56             continue;
  57           default:
  58             ;
  59           }
  60         if (inlength == 0)
  61           break;
  62         char ch = inbuffer[inpos++];
  63         inlength--;
  64         if (ch == '\\')
  65           {
  66             buf[count++] = (byte) '\\';
  67             pending_char = ch;
  68             todo = 1;
  69             avail--;
  70           }
  71         else if (ch < 127)
  72           {
  73             buf[count++] = (byte) ch;
  74             avail--;
  75           }
  76         else
  77           {
  78             buf[count++] = (byte) '\\';
  79             pending_char = ch;
  80             todo = 5;
  81             avail--;
  82           }
  83       }
  84     return inpos - start_pos;
  85   }
  86 }