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40 lines
824 B
C++
40 lines
824 B
C++
#include "stdafx.h"
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#include "CRC32.h"
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void CRC32::AddData(const uint8_t* pData, const std::streamoff length)
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{
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uint8_t* pCur = (uint8_t*)pData;
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for(std::streamoff remaining = length; remaining--; ++pCur) {
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_crc = (_crc >> 8) ^ kCrc32Table[(_crc ^ *pCur) & 0xff];
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}
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}
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uint32_t CRC32::GetCRC(uint8_t *buffer, std::streamoff length)
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{
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CRC32 crc;
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crc.AddData(buffer, length);
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return crc._crc;
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}
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uint32_t CRC32::GetCRC(string filename)
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{
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uint32_t crc = 0;
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ifstream file(filename, std::ios::in | std::ios::binary);
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if(file) {
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file.seekg(0, std::ios::end);
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std::streamoff fileSize = file.tellg();
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file.seekg(0, std::ios::beg);
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uint8_t* buffer = new uint8_t[(uint32_t)fileSize];
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file.read((char*)buffer, fileSize);
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file.close();
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crc = GetCRC(buffer, fileSize);
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delete[] buffer;
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}
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return crc;
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} |