ocean.io.compress.lzo.LzoCrc source code

1 /******************************************************************************
2 
3     CRC-32 generator, uses LZO's built-in CRC-32 calculator
4 
5     Copyright:
6         Copyright (c) 2009-2016 dunnhumby Germany GmbH.
7         All rights reserved.
8 
9     License:
10         Boost Software License Version 1.0. See LICENSE_BOOST.txt for details.
11         Alternatively, this file may be distributed under the terms of the Tango
12         3-Clause BSD License (see LICENSE_BSD.txt for details).
13 
14  ******************************************************************************/
15 
16 module ocean.io.compress.lzo.LzoCrc;
17 
18 
19 import ocean.io.compress.lzo.c.lzoconf: lzo_crc32, lzo_crc32_init;
20 
21 import ocean.meta.types.Qualifiers;
22 import ocean.core.TypeConvert;
23 
24 /******************************************************************************
25 
26     LzoCrc structure; contains only static methods
27 
28  ******************************************************************************/
29 
30 struct LzoCrc
31 {
32     static:
33 
34     /**************************************************************************
35 
36         Calculates a 32-bit CRC value from data.
37 
38         Params:
39             crc32_in = initial 32-bit CRC value (for iteration)
40             data     = data to calculate 32-bit CRC value of
41 
42         Returns:
43             resulting 32-bit CRC value
44 
45     **************************************************************************/
46 
47     uint crc32 ( uint crc32_in, in void[] data )
48     {
49         return lzo_crc32(crc32_in, cast (const(ubyte)*) data.ptr,
50             castFrom!(size_t).to!(int)(data.length));
51     }
52 
53     /**************************************************************************
54 
55     Calculates a 32-bit CRC value from data.
56 
57     Params:
58         data = data to calculate 32-bit CRC value of
59 
60     Returns:
61         resulting 32-bit CRC value
62 
63     **************************************************************************/
64 
65     uint crc32 ( in void[] data )
66     {
67         return crc32(lzo_crc32_init(), data);
68     }
69 }