?? crc32static.cpp
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#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
{
LPBYTE pByte;
// Loop while we map a section of the file and CRC it
while(qwFileSize > 0)
{
if(qwFileSize < MAX_VIEW_SIZE)
dwViewSize = LODWORD(qwFileSize);
else
dwViewSize = MAX_VIEW_SIZE;
dwBaseAddress = (DWORD)MapViewOfFile(hFilemap,
FILE_MAP_READ,
HIDWORD(qwFileOffset),
LODWORD(qwFileOffset),
dwViewSize);
dwByteCount = dwViewSize;
pByte = (LPBYTE)dwBaseAddress;
while(dwByteCount-- > 0)
{
CalcCrc32(*pByte, dwCrc32);
pByte++;
}
UnmapViewOfFile((LPVOID)dwBaseAddress);
qwFileOffset += dwViewSize;
qwFileSize -= dwViewSize;
}
}
}
}
}
catch(...)
{
// An unknown exception happened
dwErrorCode = ERROR_CRC;
}
if(hFile != NULL) CloseHandle(hFile);
if(hFilemap != NULL) CloseHandle(hFilemap);
dwCrc32 = ~dwCrc32;
return dwErrorCode;
}
//***********************************************
DWORD CCrc32Static::FileCrc32Assembly(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
{
// There is a bug in the Microsoft compilers where inline assembly
// code cannot access static member variables. This is a work around
// for that bug. For more info see Knowledgebase article Q88092
LPVOID ptrCrc32Table = &s_arrdwCrc32Table;
BYTE buffer[MAX_BUFFER_SIZE];
DWORD dwBytesRead;
BOOL bSuccess = ReadFile(hFile, buffer, sizeof(buffer), &dwBytesRead, NULL);
while(bSuccess && dwBytesRead)
{
// Register use:
// eax - CRC32 value
// ebx - a lot of things
// ecx - CRC32 value
// edx - address of end of buffer
// esi - address of start of buffer
// edi - CRC32 table
__asm
{
// Save the esi and edi registers
push esi
push edi
mov eax, dwCrc32 // Load the pointer to dwCrc32
mov ecx, [eax] // Dereference the pointer to load dwCrc32
mov edi, ptrCrc32Table // Load the CRC32 table
lea esi, buffer // Load buffer
mov ebx, dwBytesRead // Load dwBytesRead
lea edx, [esi + ebx] // Calculate the end of the buffer
crc32loop:
xor eax, eax // Clear the eax register
mov bl, byte ptr [esi] // Load the current source byte
mov al, cl // Copy crc value into eax
inc esi // Advance the source pointer
xor al, bl // Create the index into the CRC32 table
shr ecx, 8
mov ebx, [edi + eax * 4] // Get the value out of the table
xor ecx, ebx // xor with the current byte
cmp edx, esi // Have we reached the end of the buffer?
jne crc32loop
// Restore the edi and esi registers
pop edi
pop esi
mov eax, dwCrc32 // Load the pointer to dwCrc32
mov [eax], ecx // Write the result
}
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;
}
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