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124 lines
3.3 KiB
124 lines
3.3 KiB
/* |
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Simple DirectMedia Layer |
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Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org> |
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This software is provided 'as-is', without any express or implied |
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warranty. In no event will the authors be held liable for any damages |
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arising from the use of this software. |
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Permission is granted to anyone to use this software for any purpose, |
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including commercial applications, and to alter it and redistribute it |
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freely, subject to the following restrictions: |
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1. The origin of this software must not be misrepresented; you must not |
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claim that you wrote the original software. If you use this software |
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in a product, an acknowledgment in the product documentation would be |
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appreciated but is not required. |
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2. Altered source versions must be plainly marked as such, and must not be |
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misrepresented as being the original software. |
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3. This notice may not be removed or altered from any source distribution. |
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*/ |
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/** |
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* \file SDL_test_crc32.h |
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* |
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* Include file for SDL test framework. |
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* |
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* This code is a part of the SDL2_test library, not the main SDL library. |
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*/ |
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/* |
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Implements CRC32 calculations (default output is Perl String::CRC32 compatible). |
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*/ |
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#ifndef SDL_test_crc32_h_ |
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#define SDL_test_crc32_h_ |
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#include "begin_code.h" |
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/* Set up for C function definitions, even when using C++ */ |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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/* ------------ Definitions --------- */ |
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/* Definition shared by all CRC routines */ |
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#ifndef CrcUint32 |
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#define CrcUint32 unsigned int |
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#endif |
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#ifndef CrcUint8 |
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#define CrcUint8 unsigned char |
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#endif |
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#ifdef ORIGINAL_METHOD |
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#define CRC32_POLY 0x04c11db7 /* AUTODIN II, Ethernet, & FDDI */ |
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#else |
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#define CRC32_POLY 0xEDB88320 /* Perl String::CRC32 compatible */ |
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#endif |
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/** |
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* Data structure for CRC32 (checksum) computation |
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*/ |
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typedef struct { |
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CrcUint32 crc32_table[256]; /* CRC table */ |
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} SDLTest_Crc32Context; |
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/* ---------- Function Prototypes ------------- */ |
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/** |
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* \brief Initialize the CRC context |
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* |
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* Note: The function initializes the crc table required for all crc calculations. |
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* |
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* \param crcContext pointer to context variable |
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* |
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* \returns 0 for OK, -1 on error |
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* |
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*/ |
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int SDLTest_Crc32Init(SDLTest_Crc32Context * crcContext); |
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/** |
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* \brief calculate a crc32 from a data block |
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* |
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* \param crcContext pointer to context variable |
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* \param inBuf input buffer to checksum |
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* \param inLen length of input buffer |
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* \param crc32 pointer to Uint32 to store the final CRC into |
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* |
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* \returns 0 for OK, -1 on error |
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* |
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*/ |
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int SDLTest_Crc32Calc(SDLTest_Crc32Context * crcContext, CrcUint8 *inBuf, CrcUint32 inLen, CrcUint32 *crc32); |
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/* Same routine broken down into three steps */ |
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int SDLTest_Crc32CalcStart(SDLTest_Crc32Context * crcContext, CrcUint32 *crc32); |
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int SDLTest_Crc32CalcEnd(SDLTest_Crc32Context * crcContext, CrcUint32 *crc32); |
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int SDLTest_Crc32CalcBuffer(SDLTest_Crc32Context * crcContext, CrcUint8 *inBuf, CrcUint32 inLen, CrcUint32 *crc32); |
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/** |
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* \brief clean up CRC context |
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* |
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* \param crcContext pointer to context variable |
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* |
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* \returns 0 for OK, -1 on error |
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* |
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*/ |
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int SDLTest_Crc32Done(SDLTest_Crc32Context * crcContext); |
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/* Ends C function definitions when using C++ */ |
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#ifdef __cplusplus |
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} |
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#endif |
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#include "close_code.h" |
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#endif /* SDL_test_crc32_h_ */ |
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/* vi: set ts=4 sw=4 expandtab: */
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