01: /*
02: *
03: *
04: * Copyright 1990-2007 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: package com.sun.satsa.aclapplet;
28:
29: import javacard.framework.Util;
30:
31: /**
32: * Utility class for byte buffer parsing.
33: */
34: public class Parser {
35:
36: /** Data buffer. */
37: static byte[] data;
38: /** Current offset. */
39: static short offset;
40:
41: /**
42: * Initialises the parser.
43: * @param buff data buffer
44: */
45: static void init(byte[] buff) {
46: data = buff;
47: offset = 0;
48: }
49:
50: /**
51: * Returns the next byte from the buffer.
52: * @return byte value
53: */
54: static byte getByte() {
55: return data[offset++];
56: }
57:
58: /**
59: * Returns the next short value from the buffer.
60: * @return short value
61: */
62: static short getShort() {
63: short s = Util.getShort(data, offset);
64: offset += 2;
65: return s;
66: }
67:
68: /**
69: * Changes the current offset to skip sequence of bytes.
70: * @param len the number of bytes to skip
71: */
72: static void skip(short len) {
73: offset += len;
74: }
75: }
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