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125 lines
3.3 KiB
C
125 lines
3.3 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2017 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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