| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2023 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 |
| * |
| * \brief CRC32 functions of SDL test framework. |
| * |
| * This code is a part of the SDL 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 <SDL3/SDL_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 <SDL3/SDL_close_code.h> |
| |
| #endif /* SDL_test_crc32_h_ */ |