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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2023 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: */