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  1. /*
  2.   Simple DirectMedia Layer
  3.   Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
  4.  
  5.   This software is provided 'as-is', without any express or implied
  6.   warranty.  In no event will the authors be held liable for any damages
  7.   arising from the use of this software.
  8.  
  9.   Permission is granted to anyone to use this software for any purpose,
  10.   including commercial applications, and to alter it and redistribute it
  11.   freely, subject to the following restrictions:
  12.  
  13.   1. The origin of this software must not be misrepresented; you must not
  14.      claim that you wrote the original software. If you use this software
  15.      in a product, an acknowledgment in the product documentation would be
  16.      appreciated but is not required.
  17.   2. Altered source versions must be plainly marked as such, and must not be
  18.      misrepresented as being the original software.
  19.   3. This notice may not be removed or altered from any source distribution.
  20. */
  21.  
  22. /**
  23.  *  \file SDL_test_crc32.h
  24.  *
  25.  *  Include file for SDL test framework.
  26.  *
  27.  *  This code is a part of the SDL2_test library, not the main SDL library.
  28.  */
  29.  
  30. /*
  31.  
  32.  Implements CRC32 calculations (default output is Perl String::CRC32 compatible).
  33.  
  34. */
  35.  
  36. #ifndef SDL_test_crc32_h_
  37. #define SDL_test_crc32_h_
  38.  
  39. #include "begin_code.h"
  40. /* Set up for C function definitions, even when using C++ */
  41. #ifdef __cplusplus
  42. extern "C" {
  43. #endif
  44.  
  45.  
  46. /* ------------ Definitions --------- */
  47.  
  48. /* Definition shared by all CRC routines */
  49.  
  50. #ifndef CrcUint32
  51.  #define CrcUint32  unsigned int
  52. #endif
  53. #ifndef CrcUint8
  54.  #define CrcUint8   unsigned char
  55. #endif
  56.  
  57. #ifdef ORIGINAL_METHOD
  58.  #define CRC32_POLY 0x04c11db7   /* AUTODIN II, Ethernet, & FDDI */
  59. #else
  60.  #define CRC32_POLY 0xEDB88320   /* Perl String::CRC32 compatible */
  61. #endif
  62.  
  63. /**
  64.  * Data structure for CRC32 (checksum) computation
  65.  */
  66.   typedef struct {
  67.     CrcUint32    crc32_table[256]; /* CRC table */
  68.   } SDLTest_Crc32Context;
  69.  
  70. /* ---------- Function Prototypes ------------- */
  71.  
  72. /**
  73.  * \brief Initialize the CRC context
  74.  *
  75.  * Note: The function initializes the crc table required for all crc calculations.
  76.  *
  77.  * \param crcContext        pointer to context variable
  78.  *
  79.  * \returns 0 for OK, -1 on error
  80.  *
  81.  */
  82.  int SDLTest_Crc32Init(SDLTest_Crc32Context * crcContext);
  83.  
  84.  
  85. /**
  86.  * \brief calculate a crc32 from a data block
  87.  *
  88.  * \param crcContext         pointer to context variable
  89.  * \param inBuf              input buffer to checksum
  90.  * \param inLen              length of input buffer
  91.  * \param crc32              pointer to Uint32 to store the final CRC into
  92.  *
  93.  * \returns 0 for OK, -1 on error
  94.  *
  95.  */
  96. int SDLTest_Crc32Calc(SDLTest_Crc32Context * crcContext, CrcUint8 *inBuf, CrcUint32 inLen, CrcUint32 *crc32);
  97.  
  98. /* Same routine broken down into three steps */
  99. int SDLTest_Crc32CalcStart(SDLTest_Crc32Context * crcContext, CrcUint32 *crc32);
  100. int SDLTest_Crc32CalcEnd(SDLTest_Crc32Context * crcContext, CrcUint32 *crc32);
  101. int SDLTest_Crc32CalcBuffer(SDLTest_Crc32Context * crcContext, CrcUint8 *inBuf, CrcUint32 inLen, CrcUint32 *crc32);
  102.  
  103.  
  104. /**
  105.  * \brief clean up CRC context
  106.  *
  107.  * \param crcContext        pointer to context variable
  108.  *
  109.  * \returns 0 for OK, -1 on error
  110.  *
  111. */
  112.  
  113. int SDLTest_Crc32Done(SDLTest_Crc32Context * crcContext);
  114.  
  115.  
  116. /* Ends C function definitions when using C++ */
  117. #ifdef __cplusplus
  118. }
  119. #endif
  120. #include "close_code.h"
  121.  
  122. #endif /* SDL_test_crc32_h_ */
  123.  
  124. /* vi: set ts=4 sw=4 expandtab: */
  125.