C语言实现的CRC32源码

#include "stdafx.h" #include "Crc32Static.h" #include <fstream.h> // Static CRC table DWORD CCrc32Static::s_arrdwCrc32Table[256] = { 0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433, 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F, 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777, 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D, }; //*********************************************** CCrc32Static::CCrc32Static() { } //*********************************************** CCrc32Static::~CCrc32Static() { } //*********************************************** inline void CCrc32Static::CalcCrc32(const BYTE byte, DWORD &dwCrc32) { dwCrc32 = ((dwCrc32) >> 8) ^ s_arrdwCrc32Table[(byte) ^ ((dwCrc32) & 0x000000FF)]; } //*********************************************** bool CCrc32Static::GetFileSizeQW(const HANDLE hFile, QWORD &qwSize) { _ASSERTE(hFile != INVALID_HANDLE_VALUE); bool bSuccess = true; try { DWORD dwLo = 0, dwHi = 0; dwLo = GetFileSize(hFile, &dwHi); if(dwLo == INVALID_FILE_SIZE && GetLastError() != NO_ERROR) { bSuccess = false; qwSize = 0; } else { qwSize = MAKEQWORD(dwHi, dwLo); } } catch(...) { bSuccess = false; } return bSuccess; } //*********************************************** DWORD CCrc32Static::StringCrc32(LPCTSTR szString, DWORD &dwCrc32) { _ASSERTE(szString); DWORD dwErrorCode = NO_ERROR; dwCrc32 = 0xFFFFFFFF; try { while(*szString != _T('\0')) { CalcCrc32((BYTE)*szString, dwCrc32); szString++; } } catch(...) { // An unknown exception happened dwErrorCode = ERROR_CRC; } dwCrc32 = ~dwCrc32; return dwErrorCode; } //*********************************************** DWORD CCrc32Static::FileCrc32Streams(LPCTSTR szFilename, DWORD &dwCrc32) { #if UNICODE || _UNICODE return ERROR_NOT_SUPPORTED; #else _ASSERTE(szFilename); _ASSERTE(lstrlen(szFilename)); DWORD dwErrorCode = NO_ERROR; ifstream file; dwCrc32 = 0xFFFFFFFF; try { // Open the file file.open(szFilename, ios::in | ios::nocreate | ios::binary, filebuf::sh_read); if(file.is_open()) { char buffer[MAX_BUFFER_SIZE]; int nLoop, nCount; nCount = file.read(buffer, sizeof(buffer)).gcount(); while(nCount) { for(nLoop = 0; nLoop < nCount; nLoop++) CalcCrc32(buffer[nLoop], dwCrc32); nCount = file.read(buffer, sizeof(buffer)).gcount(); } file.close(); } } catch(...) { // An unknown exception happened dwErrorCode = ERROR_CRC; } if(file.is_open()) file.close(); dwCrc32 = ~dwCrc32; return dwErrorCode; #endif } //*********************************************** DWORD CCrc32Static::FileCrc32Win32(LPCTSTR szFilename, DWORD &dwCrc32) { _ASSERTE(szFilename); _ASSERTE(lstrlen(szFilename)); DWORD dwErrorCode = NO_ERROR; HANDLE hFile = NULL; dwCrc32 = 0xFFFFFFFF; try { // Open the file hFile = CreateFile(szFilename, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_ARCHIVE | FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_READONLY | FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_SEQUENTIAL_SCAN, NULL); if(hFile == INVALID_HANDLE_VALUE) dwErrorCode = GetLastError(); else { BYTE buffer[MAX_BUFFER_SIZE]; DWORD dwBytesRead, dwLoop; BOOL bSuccess = ReadFile(hFile, buffer, sizeof(buffer), &dwBytesRead, NULL); while(bSuccess && dwBytesRead) { for(dwLoop = 0; dwLoop < dwBytesRead; dwLoop++) CalcCrc32(buffer[dwLoop], dwCrc32); bSuccess = ReadFile(hFile, buffer, sizeof(buffer), &dwBytesRead, NULL); } } } catch(...) { // An unknown exception happened dwErrorCode = ERROR_CRC; } if(hFile != NULL) CloseHandle(hFile); dwCrc32 = ~dwCrc32; return dwErrorCode; } //*********************************************** DWORD CCrc32Static::FileCrc32Filemap(LPCTSTR szFilename, DWORD &dwCrc32) { _ASSERTE(szFilename); _ASSERTE(lstrlen(szFilename)); DWORD dwErrorCode = NO_ERROR; HANDLE hFile = NULL, hFilemap = NULL; dwCrc32 = 0xFFFFFFFF; try { // Open the file hFile = CreateFile(szFilename, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_ARCHIVE | FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_READONLY | FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_SEQUENTIAL_SCAN, NULL); if(hFile == INVALID_HANDLE_VALUE) dwErrorCode = GetLastError(); else { QWORD qwFileSize = 0, qwFileOffset = 0; DWORD dwByteCount, dwViewSize; DWORD dwBaseAddress; // Get the file size if(!GetFileSizeQW(hFile, qwFileSize)) dwErrorCode = ERROR_BAD_LENGTH; else if(qwFileSize != 0) // We cannot CRC zero byte files { // Create the file mapping hFilemap = CreateFileMapping(hFile, NULL, PAGE_READONLY, 0, 0, NULL); if(hFilemap == NULL) dwErrorCode = GetLastError(); else {