125 lines
3.3 KiB
C
125 lines
3.3 KiB
C
|
/*
|
||
|
|
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
|
||
|
|
*
|
||
|
|
* 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: */
|