01: /* Copyright (C) 2004 - 2007 db4objects Inc. http://www.db4o.com
02:
03: This file is part of the db4o open source object database.
04:
05: db4o is free software; you can redistribute it and/or modify it under
06: the terms of version 2 of the GNU General Public License as published
07: by the Free Software Foundation and as clarified by db4objects' GPL
08: interpretation policy, available at
09: http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
10: Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
11: Suite 350, San Mateo, CA 94403, USA.
12:
13: db4o is distributed in the hope that it will be useful, but WITHOUT ANY
14: WARRANTY; without even the implied warranty of MERCHANTABILITY or
15: FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16: for more details.
17:
18: You should have received a copy of the GNU General Public License along
19: with this program; if not, write to the Free Software Foundation, Inc.,
20: 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21: package com.db4o.foundation;
22:
23: public final class PrimitiveCodec {
24:
25: public static final int INT_LENGTH = 4;
26:
27: public static final int LONG_LENGTH = 8;
28:
29: public static final int readInt(byte[] buffer, int offset) {
30: offset += 3;
31: return (buffer[offset] & 255) | (buffer[--offset] & 255) << 8
32: | (buffer[--offset] & 255) << 16
33: | buffer[--offset] << 24;
34: }
35:
36: public static final void writeInt(byte[] buffer, int offset, int val) {
37: offset += 3;
38: buffer[offset] = (byte) val;
39: buffer[--offset] = (byte) (val >>= 8);
40: buffer[--offset] = (byte) (val >>= 8);
41: buffer[--offset] = (byte) (val >> 8);
42: }
43:
44: public static final void writeLong(byte[] buffer, long val) {
45: writeLong(buffer, 0, val);
46: }
47:
48: public static final void writeLong(byte[] buffer, int offset,
49: long val) {
50: for (int i = 0; i < LONG_LENGTH; i++) {
51: buffer[offset++] = (byte) (val >> ((7 - i) * 8));
52: }
53: }
54:
55: public static final long readLong(byte[] buffer, int offset) {
56: long ret = 0;
57: for (int i = 0; i < LONG_LENGTH; i++) {
58: ret = (ret << 8) + (buffer[offset++] & 0xff);
59: }
60: return ret;
61: }
62:
63: }
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