01: /*
02: * @(#)ByteToCharASCII.java 1.14 06/10/10
03: *
04: * Copyright 1990-2006 Sun Microsystems, Inc. All Rights Reserved.
05: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU General Public License version
09: * 2 only, as published by the Free Software Foundation.
10: *
11: * This program is distributed in the hope that it will be useful, but
12: * WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * General Public License version 2 for more details (a copy is
15: * included at /legal/license.txt).
16: *
17: * You should have received a copy of the GNU General Public License
18: * version 2 along with this work; if not, write to the Free Software
19: * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20: * 02110-1301 USA
21: *
22: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
23: * Clara, CA 95054 or visit www.sun.com if you need additional
24: * information or have any questions.
25: *
26: */
27:
28: package sun.io;
29:
30: /**
31: * A algorithmic conversion from ASCII to Unicode
32: *
33: * @author Limin Shi
34: */
35: public class ByteToCharASCII extends ByteToCharConverter {
36:
37: // Return the character set id
38: public String getCharacterEncoding() {
39: return "ASCII";
40: }
41:
42: public int flush(char[] output, int outStart, int outEnd) {
43: // This converter will not buffer any data.
44: byteOff = charOff = 0;
45: return 0;
46: }
47:
48: /**
49: * Algorithmic character conversion
50: */
51: public int convert(byte[] input, int inOff, int inEnd,
52: char[] output, int outOff, int outEnd)
53: throws ConversionBufferFullException,
54: UnknownCharacterException {
55: byte inputByte;
56:
57: charOff = outOff;
58: byteOff = inOff;
59:
60: // Loop until we hit the end of the input
61: while (byteOff < inEnd) {
62: // If we don't have room for the output, throw an exception
63: if (charOff >= outEnd)
64: throw new ConversionBufferFullException();
65:
66: // Convert the input byte
67: inputByte = input[byteOff++];
68:
69: if (inputByte >= 0)
70: output[charOff++] = (char) inputByte;
71: else {
72: if (subMode)
73: output[charOff++] = '\uFFFD'; // Replace Char
74: else {
75: badInputLength = 1;
76: throw new UnknownCharacterException();
77: }
78: }
79: }
80:
81: // Return the length written to the output buffer
82: return charOff - outOff;
83: }
84:
85: /*
86: * Reset after finding bad input
87: */
88: public void reset() {
89: byteOff = charOff = 0;
90: }
91:
92: }
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