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| | |
| | | /* |
| | | Simple DirectMedia Layer |
| | | Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org> |
| | | |
| | | This software is provided 'as-is', without any express or implied |
| | | warranty. In no event will the authors be held liable for any damages |
| | | arising from the use of this software. |
| | | |
| | | Permission is granted to anyone to use this software for any purpose, |
| | | including commercial applications, and to alter it and redistribute it |
| | | freely, subject to the following restrictions: |
| | | |
| | | 1. The origin of this software must not be misrepresented; you must not |
| | | claim that you wrote the original software. If you use this software |
| | | in a product, an acknowledgment in the product documentation would be |
| | | appreciated but is not required. |
| | | 2. Altered source versions must be plainly marked as such, and must not be |
| | | misrepresented as being the original software. |
| | | 3. This notice may not be removed or altered from any source distribution. |
| | | */ |
| | | |
| | | /** |
| | | * \file SDL_test_crc32.h |
| | | * |
| | | * Include file for SDL test framework. |
| | | * |
| | | * This code is a part of the SDL2_test library, not the main SDL library. |
| | | */ |
| | | |
| | | /* |
| | | |
| | | Implements CRC32 calculations (default output is Perl String::CRC32 compatible). |
| | | |
| | | */ |
| | | |
| | | #ifndef _SDL_test_crc32_h |
| | | #define _SDL_test_crc32_h |
| | | |
| | | #include "begin_code.h" |
| | | /* Set up for C function definitions, even when using C++ */ |
| | | #ifdef __cplusplus |
| | | extern "C" { |
| | | #endif |
| | | |
| | | |
| | | /* ------------ Definitions --------- */ |
| | | |
| | | /* Definition shared by all CRC routines */ |
| | | |
| | | #ifndef CrcUint32 |
| | | #define CrcUint32 unsigned int |
| | | #endif |
| | | #ifndef CrcUint8 |
| | | #define CrcUint8 unsigned char |
| | | #endif |
| | | |
| | | #ifdef ORIGINAL_METHOD |
| | | #define CRC32_POLY 0x04c11db7 /* AUTODIN II, Ethernet, & FDDI */ |
| | | #else |
| | | #define CRC32_POLY 0xEDB88320 /* Perl String::CRC32 compatible */ |
| | | #endif |
| | | |
| | | /** |
| | | * Data structure for CRC32 (checksum) computation |
| | | */ |
| | | typedef struct { |
| | | CrcUint32 crc32_table[256]; /* CRC table */ |
| | | } SDLTest_Crc32Context; |
| | | |
| | | /* ---------- Function Prototypes ------------- */ |
| | | |
| | | /** |
| | | * /brief Initialize the CRC context |
| | | * |
| | | * Note: The function initializes the crc table required for all crc calculations. |
| | | * |
| | | * /param crcContext pointer to context variable |
| | | * |
| | | * /returns 0 for OK, -1 on error |
| | | * |
| | | */ |
| | | int SDLTest_Crc32Init(SDLTest_Crc32Context * crcContext); |
| | | |
| | | |
| | | /** |
| | | * /brief calculate a crc32 from a data block |
| | | * |
| | | * /param crcContext pointer to context variable |
| | | * /param inBuf input buffer to checksum |
| | | * /param inLen length of input buffer |
| | | * /param crc32 pointer to Uint32 to store the final CRC into |
| | | * |
| | | * /returns 0 for OK, -1 on error |
| | | * |
| | | */ |
| | | int SDLTest_crc32Calc(SDLTest_Crc32Context * crcContext, CrcUint8 *inBuf, CrcUint32 inLen, CrcUint32 *crc32); |
| | | |
| | | /* Same routine broken down into three steps */ |
| | | int SDLTest_Crc32CalcStart(SDLTest_Crc32Context * crcContext, CrcUint32 *crc32); |
| | | int SDLTest_Crc32CalcEnd(SDLTest_Crc32Context * crcContext, CrcUint32 *crc32); |
| | | int SDLTest_Crc32CalcBuffer(SDLTest_Crc32Context * crcContext, CrcUint8 *inBuf, CrcUint32 inLen, CrcUint32 *crc32); |
| | | |
| | | |
| | | /** |
| | | * /brief clean up CRC context |
| | | * |
| | | * /param crcContext pointer to context variable |
| | | * |
| | | * /returns 0 for OK, -1 on error |
| | | * |
| | | */ |
| | | |
| | | int SDLTest_Crc32Done(SDLTest_Crc32Context * crcContext); |
| | | |
| | | |
| | | /* Ends C function definitions when using C++ */ |
| | | #ifdef __cplusplus |
| | | } |
| | | #endif |
| | | #include "close_code.h" |
| | | |
| | | #endif /* _SDL_test_crc32_h */ |
| | | |
| | | /* vi: set ts=4 sw=4 expandtab: */ |