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CRC7.cpp
- Committer:
- tashworth
- Date:
- 2014-04-05
- Revision:
- 3:01272a06e922
- Parent:
- 0:511d65ef1276
File content as of revision 3:01272a06e922:
/** * @file CRC7.cpp * @author Edward Wilson (edwilson1989@gmail.com) * @date Dec 16, 2010 * @brief The CRC7 checksum code. * * */ #include "CRC7.h" CRC7::CRC7() { GenerateCRCTable(); } unsigned char CRC7::GetCRC(unsigned char val) { int j; for (j = 0; j < 8; j++) { if (val & 1) val ^= CRC7_POLY; val >>= 1; } return val; } unsigned char CRC7::CRC(unsigned char message[], unsigned int length) { unsigned char i, crc = 0; for (i = 0; i < length; i++) crc = CRCTable[crc ^ message[i]]; return crc; } void CRC7::GenerateCRCTable() { int i; // generate a table value for all 256 possible byte values for (i = 0; i < 256; i++) { CRCTable[i] = GetCRC(i); } }