Mercurial > hg > audiostuff
comparison spandsp-0.0.6pre17/src/spandsp/crc.h @ 4:26cd8f1ef0b1
import spandsp-0.0.6pre17
author | Peter Meerwald <pmeerw@cosy.sbg.ac.at> |
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date | Fri, 25 Jun 2010 15:50:58 +0200 |
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3:c6c5a16ce2f2 | 4:26cd8f1ef0b1 |
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1 /* | |
2 * SpanDSP - a series of DSP components for telephony | |
3 * | |
4 * crc.h | |
5 * | |
6 * Written by Steve Underwood <steveu@coppice.org> | |
7 * | |
8 * Copyright (C) 2003 Steve Underwood | |
9 * | |
10 * All rights reserved. | |
11 * | |
12 * This program is free software; you can redistribute it and/or modify | |
13 * it under the terms of the GNU Lesser General Public License version 2.1, | |
14 * as published by the Free Software Foundation. | |
15 * | |
16 * This program is distributed in the hope that it will be useful, | |
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 * GNU Lesser General Public License for more details. | |
20 * | |
21 * You should have received a copy of the GNU Lesser General Public | |
22 * License along with this program; if not, write to the Free Software | |
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
24 * | |
25 * $Id: crc.h,v 1.5 2009/01/31 08:48:11 steveu Exp $ | |
26 */ | |
27 | |
28 /*! \file */ | |
29 | |
30 /*! \page crc_page CRC | |
31 | |
32 \section crc_page_sec_1 What does it do? | |
33 | |
34 \section crc_page_sec_2 How does it work? | |
35 */ | |
36 | |
37 #if !defined(_SPANDSP_CRC_H_) | |
38 #define _SPANDSP_CRC_H_ | |
39 | |
40 #if defined(__cplusplus) | |
41 extern "C" | |
42 { | |
43 #endif | |
44 | |
45 /*! \brief Calculate the ITU/CCITT CRC-32 value in buffer. | |
46 \param buf The buffer containing the data. | |
47 \param len The length of the frame. | |
48 \param crc The initial CRC value. This is usually 0xFFFFFFFF, or 0 for a new block (it depends on | |
49 the application). It is previous returned CRC value for the continuation of a block. | |
50 \return The CRC value. | |
51 */ | |
52 SPAN_DECLARE(uint32_t) crc_itu32_calc(const uint8_t *buf, int len, uint32_t crc); | |
53 | |
54 /*! \brief Append an ITU/CCITT CRC-32 value to a frame. | |
55 \param buf The buffer containing the frame. This must be at least 2 bytes longer than | |
56 the frame it contains, to allow room for the CRC value. | |
57 \param len The length of the frame. | |
58 \return The new length of the frame. | |
59 */ | |
60 SPAN_DECLARE(int) crc_itu32_append(uint8_t *buf, int len); | |
61 | |
62 /*! \brief Check the ITU/CCITT CRC-32 value in a frame. | |
63 \param buf The buffer containing the frame. | |
64 \param len The length of the frame. | |
65 \return TRUE if the CRC is OK, else FALSE. | |
66 */ | |
67 SPAN_DECLARE(int) crc_itu32_check(const uint8_t *buf, int len); | |
68 | |
69 /*! \brief Calculate the ITU/CCITT CRC-16 value in buffer. | |
70 \param buf The buffer containing the data. | |
71 \param len The length of the frame. | |
72 \param crc The initial CRC value. This is usually 0xFFFF, or 0 for a new block (it depends on | |
73 the application). It is previous returned CRC value for the continuation of a block. | |
74 \return The CRC value. | |
75 */ | |
76 SPAN_DECLARE(uint16_t) crc_itu16_calc(const uint8_t *buf, int len, uint16_t crc); | |
77 | |
78 /*! \brief Append an ITU/CCITT CRC-16 value to a frame. | |
79 \param buf The buffer containing the frame. This must be at least 2 bytes longer than | |
80 the frame it contains, to allow room for the CRC value. | |
81 \param len The length of the frame. | |
82 \return The new length of the frame. | |
83 */ | |
84 SPAN_DECLARE(int) crc_itu16_append(uint8_t *buf, int len); | |
85 | |
86 /*! \brief Check the ITU/CCITT CRC-16 value in a frame. | |
87 \param buf The buffer containing the frame. | |
88 \param len The length of the frame. | |
89 \return TRUE if the CRC is OK, else FALSE. | |
90 */ | |
91 SPAN_DECLARE(int) crc_itu16_check(const uint8_t *buf, int len); | |
92 | |
93 #if defined(__cplusplus) | |
94 } | |
95 #endif | |
96 | |
97 #endif | |
98 /*- End of file ------------------------------------------------------------*/ |