90 lines
1.6 KiB
Java
90 lines
1.6 KiB
Java
/* Copyright (C) 1999 Cygnus Solutions
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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package gnu.gcj.convert;
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/**
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* Convert Ascii with \ u XXXX-escapes to Unicode.
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* @author Per Bothner <bothner@cygnus.com>
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* @date April 1999.
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*/
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public class Input_JavaSrc extends BytesToUnicode
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{
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public String getName() { return "JavaSrc"; }
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// 0: normal
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// 1: seen '\\'
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// 2: seen '\\' and 'u'
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// 3: seen '\\' and need to emit value.
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// 4, 5, 6, 7: seen '\\u', 'u' and (state-3) hex digits.
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int state = 0;
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int value;
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public int read (char[] outbuffer, int outpos, int count)
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{
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int origpos = outpos;
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for (;;)
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{
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if (inpos >= inlength)
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break;
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if (outpos - origpos >= count)
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break;
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char b = (char) (inbuffer[inpos++] & 0xFF);
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switch (state)
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{
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case 0:
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if (b == '\\')
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{
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state = 1;
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continue;
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}
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break;
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case 1:
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if (b == 'u')
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{
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state = 2;
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continue;
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}
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if (b != '\\')
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{
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value = b;
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b = '\\';
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state = 3;
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}
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break;
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case 3:
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b = (char) value;
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break;
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default: // case 4: case 5: case 6: case 7:
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int digit = Character.digit(b, 16);
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if (digit < 0)
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{
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b = '\uFFFD';
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state = 0;
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}
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else
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{
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value = value * 16 + digit;
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if (state < 7)
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{
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state++;
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continue;
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}
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b = (char) value;
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}
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state = 0;
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}
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outbuffer[outpos++] = b;
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}
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return outpos - origpos;
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}
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}
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