2 Simple DirectMedia Layer
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23 * \file SDL_test_crc32.h
25 * Include file for SDL test framework.
27 * This code is a part of the SDL2_test library, not the main SDL library.
32 Implements CRC32 calculations (default output is Perl String::CRC32 compatible).
36 #ifndef _SDL_test_crc32_h
37 #define _SDL_test_crc32_h
39 #include "begin_code.h"
40 /* Set up for C function definitions, even when using C++ */
46 /* ------------ Definitions --------- */
48 /* Definition shared by all CRC routines */
51 #define CrcUint32 unsigned int
54 #define CrcUint8 unsigned char
57 #ifdef ORIGINAL_METHOD
58 #define CRC32_POLY 0x04c11db7 /* AUTODIN II, Ethernet, & FDDI */
60 #define CRC32_POLY 0xEDB88320 /* Perl String::CRC32 compatible */
64 * Data structure for CRC32 (checksum) computation
67 CrcUint32 crc32_table[256]; /* CRC table */
68 } SDLTest_Crc32Context;
70 /* ---------- Function Prototypes ------------- */
73 * /brief Initialize the CRC context
75 * Note: The function initializes the crc table required for all crc calculations.
77 * /param crcContext pointer to context variable
79 * /returns 0 for OK, -1 on error
82 int SDLTest_Crc32Init(SDLTest_Crc32Context * crcContext);
86 * /brief calculate a crc32 from a data block
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
93 * /returns 0 for OK, -1 on error
96 int SDLTest_crc32Calc(SDLTest_Crc32Context * crcContext, CrcUint8 *inBuf, CrcUint32 inLen, CrcUint32 *crc32);
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);
105 * /brief clean up CRC context
107 * /param crcContext pointer to context variable
109 * /returns 0 for OK, -1 on error
113 int SDLTest_Crc32Done(SDLTest_Crc32Context * crcContext);
116 /* Ends C function definitions when using C++ */
120 #include "close_code.h"
122 #endif /* _SDL_test_crc32_h */
124 /* vi: set ts=4 sw=4 expandtab: */