| /* $Id$ */ |
| /* |
| * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) |
| * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| #ifndef __PJLIB_UTIL_CRC32_H__ |
| #define __PJLIB_UTIL_CRC32_H__ |
| |
| /** |
| * @file crc32.h |
| * @brief CRC32 implementation |
| */ |
| |
| #include <pjlib-util/types.h> |
| |
| PJ_BEGIN_DECL |
| |
| /** |
| * @defgroup PJLIB_UTIL_CRC32 CRC32 (Cyclic Redundancy Check) |
| * @ingroup PJLIB_UTIL_ENCRYPTION |
| * @{ |
| * This implements CRC32 algorithm. See ITU-T V.42 for the formal |
| * specification. |
| */ |
| |
| /** CRC32 context. */ |
| typedef struct pj_crc32_context |
| { |
| pj_uint32_t crc_state; /**< Current state. */ |
| } pj_crc32_context; |
| |
| |
| /** |
| * Initialize CRC32 context. |
| * |
| * @param ctx CRC32 context. |
| */ |
| PJ_DECL(void) pj_crc32_init(pj_crc32_context *ctx); |
| |
| /** |
| * Feed data incrementally to the CRC32 algorithm. |
| * |
| * @param ctx CRC32 context. |
| * @param data Input data. |
| * @param nbytes Length of the input data. |
| * |
| * @return The current CRC32 value. |
| */ |
| PJ_DECL(pj_uint32_t) pj_crc32_update(pj_crc32_context *ctx, |
| const pj_uint8_t *data, |
| pj_size_t nbytes); |
| |
| /** |
| * Finalize CRC32 calculation and retrieve the CRC32 value. |
| * |
| * @param ctx CRC32 context. |
| * |
| * @return The current CRC value. |
| */ |
| PJ_DECL(pj_uint32_t) pj_crc32_final(pj_crc32_context *ctx); |
| |
| /** |
| * Perform one-off CRC32 calculation to the specified data. |
| * |
| * @param data Input data. |
| * @param nbytes Length of input data. |
| * |
| * @return CRC value of the data. |
| */ |
| PJ_DECL(pj_uint32_t) pj_crc32_calc(const pj_uint8_t *data, |
| pj_size_t nbytes); |
| |
| |
| /** |
| * @} |
| */ |
| |
| PJ_END_DECL |
| |
| |
| #endif /* __PJLIB_UTIL_CRC32_H__ */ |
| |