ae.utils.bitmanip source code

1 /**
2  * Bit manipulation.
3  *
4  * License:
5  *   This Source Code Form is subject to the terms of
6  *   the Mozilla Public License, v. 2.0. If a copy of
7  *   the MPL was not distributed with this file, You
8  *   can obtain one at http://mozilla.org/MPL/2.0/.
9  *
10  * Authors:
11  *   Vladimir Panteleev <vladimir@thecybershadow.net>
12  *   Simon Arlott
13  */
14 
15 module ae.utils.bitmanip;
16 
17 import std.bitmanip;
18 import std.traits;
19 
20 struct BigEndian(T)
21 {
22 	private ubyte[T.sizeof] _endian_bytes;
23 	@property T _endian_value() { return cast(T)bigEndianToNative!(OriginalType!T)(_endian_bytes); }
24 	@property void _endian_value(T value) { _endian_bytes = nativeToBigEndian(OriginalType!T(value)); }
25 	alias _endian_value this;
26 	alias opAssign = _endian_value;
27 }
28 
29 struct LittleEndian(T)
30 {
31 	private ubyte[T.sizeof] _endian_bytes;
32 	@property T _endian_value() { return cast(T)littleEndianToNative!(OriginalType!T)(_endian_bytes); }
33 	@property void _endian_value(T value) { _endian_bytes = nativeToLittleEndian(OriginalType!T(value)); }
34 	alias _endian_value this;
35 	alias opAssign = _endian_value;
36 }
37 
38 unittest
39 {
40 	union U
41 	{
42 		BigEndian!ushort be;
43 		LittleEndian!ushort le;
44 		ubyte[2] bytes;
45 	}
46 	U u;
47 
48 	u.be = 0x1234;
49 	assert(u.bytes == [0x12, 0x34]);
50 
51 	u.le = 0x1234;
52 	assert(u.bytes == [0x34, 0x12]);
53 
54 	u.bytes = [0x56, 0x78];
55 	assert(u.be == 0x5678);
56 	assert(u.le == 0x7856);
57 }
58 
59 unittest
60 {
61 	enum E : uint { e }
62 	BigEndian!E be;
63 }