CRC32
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Hi, Please see following codes on CRC 32:- CRC32.h #ifndef _CRC_32_H_EA6C0EE0_BC30_11d5_B625_A58C4DF45B22_INCLUDED #define _CRC_32_H_EA6C0EE0_BC30_11d5_B625_A58C4DF45B22_INCLUDED #if MSCVER > 1000 #pragma once #endif #ifndef WINDOWS #include #endif #define WM_CRC_THREAD_DONE WM_APP + 0X2DB1 class CRC_32 { typedef struct tag_CRCstruct { CRC_32 *pCRC_32; TCHAR FileName[MaxPath]; LPBYTE pByte; UINT size; HWND hWnd; HANDLE Thread; } CRCStruct, *LPCRCSTRUCT; public: CRC_32(); DWORD CalcCRC(LPCTSTR FileName, HWND ProgressWnd = NULL); DWORD CalcCRC(LPVOID buffer, UINT Size, HWND ProgressWnd = NULL); private: static DWORD WINAPI CRC32ThreadProc (LPVOID lpVoid); void Calculate (const LPBYTE buffer, UINT Size, ULONG &crc); ULONG Reflect (ULONG ref, char ch); ULONG Table[256]; }; #endif ****************************************************************************** CRC32.cpp #include "CRC2.h" #include #include #include #include #include #define BUFFERSIZE 102400 DWORD WINAPI CRC_32::CRC32ThreadProc(LPVOID lpVoid) { LPCRCStruct pCRCSt = (LPCRCStruct)lpVoid; ULONG CRC = 0xFFFFFFFF; HWND Progress = NULL; if (::IsWindow(pCRCSt->hWnd)) { Progress = pCRCSt->hWnd; ::PostMessage(Progress, PBM_SETPOS, 0,0); ::PostMessage(Progress, PBM_SETRANGE32, 0, 100); } if (pCRCSt->pByte) { for (UINT offset = 0; offset < pCRCSt->size; offset += BUFFERSIZE) { pCRCSt->pCRC_32->Calculate(pCRCSt->pByte + offset, (pCRCSt->size - offset > BUFFERSIZE) ? BUFFERSIZE : (pCRCSt->size - offset), CRC); if (::IsWindow(Progress)) { int percent = offset > pCRCSt->size ? 100 : (int)(((double) offset / (double)pCRCSt->size) * 100); ::PostMessage(Progress, PBM_SETPOS, PERCENT, 0); } } } else if (pCRCSt->FileName) { LONGLONG done = 0; UINT size = BUFFERSIZE; BYTE buffer [BUFFERSIZE]; int theFile = _tsopen(pCRCSt->FileName, _O_RDONLY | _O_SEQUENTIAL | _O_BINARY, _SH_DENYWR); if (theFile != -1) { _lseekie64 (theFile, 0L, SEEK_SET); while (size == BUFFERSIZE) { size = _read(theFile, buffer, BUFFERSIZE); if (size) { pCRCSt->pCRC_32->Calculate(buffer, size, CRC); if (::IsWindow(Progress)) { //update progcess bar done += size; int percent = (int) (((long double)done / (long double)length) * 100); ::PostMessage(Progress,
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Hi, Please see following codes on CRC 32:- CRC32.h #ifndef _CRC_32_H_EA6C0EE0_BC30_11d5_B625_A58C4DF45B22_INCLUDED #define _CRC_32_H_EA6C0EE0_BC30_11d5_B625_A58C4DF45B22_INCLUDED #if MSCVER > 1000 #pragma once #endif #ifndef WINDOWS #include #endif #define WM_CRC_THREAD_DONE WM_APP + 0X2DB1 class CRC_32 { typedef struct tag_CRCstruct { CRC_32 *pCRC_32; TCHAR FileName[MaxPath]; LPBYTE pByte; UINT size; HWND hWnd; HANDLE Thread; } CRCStruct, *LPCRCSTRUCT; public: CRC_32(); DWORD CalcCRC(LPCTSTR FileName, HWND ProgressWnd = NULL); DWORD CalcCRC(LPVOID buffer, UINT Size, HWND ProgressWnd = NULL); private: static DWORD WINAPI CRC32ThreadProc (LPVOID lpVoid); void Calculate (const LPBYTE buffer, UINT Size, ULONG &crc); ULONG Reflect (ULONG ref, char ch); ULONG Table[256]; }; #endif ****************************************************************************** CRC32.cpp #include "CRC2.h" #include #include #include #include #include #define BUFFERSIZE 102400 DWORD WINAPI CRC_32::CRC32ThreadProc(LPVOID lpVoid) { LPCRCStruct pCRCSt = (LPCRCStruct)lpVoid; ULONG CRC = 0xFFFFFFFF; HWND Progress = NULL; if (::IsWindow(pCRCSt->hWnd)) { Progress = pCRCSt->hWnd; ::PostMessage(Progress, PBM_SETPOS, 0,0); ::PostMessage(Progress, PBM_SETRANGE32, 0, 100); } if (pCRCSt->pByte) { for (UINT offset = 0; offset < pCRCSt->size; offset += BUFFERSIZE) { pCRCSt->pCRC_32->Calculate(pCRCSt->pByte + offset, (pCRCSt->size - offset > BUFFERSIZE) ? BUFFERSIZE : (pCRCSt->size - offset), CRC); if (::IsWindow(Progress)) { int percent = offset > pCRCSt->size ? 100 : (int)(((double) offset / (double)pCRCSt->size) * 100); ::PostMessage(Progress, PBM_SETPOS, PERCENT, 0); } } } else if (pCRCSt->FileName) { LONGLONG done = 0; UINT size = BUFFERSIZE; BYTE buffer [BUFFERSIZE]; int theFile = _tsopen(pCRCSt->FileName, _O_RDONLY | _O_SEQUENTIAL | _O_BINARY, _SH_DENYWR); if (theFile != -1) { _lseekie64 (theFile, 0L, SEEK_SET); while (size == BUFFERSIZE) { size = _read(theFile, buffer, BUFFERSIZE); if (size) { pCRCSt->pCRC_32->Calculate(buffer, size, CRC); if (::IsWindow(Progress)) { //update progcess bar done += size; int percent = (int) (((long double)done / (long double)length) * 100); ::PostMessage(Progress,
This code doesn't seem to be Managed C++ - just normal Visual C++ code (so proper forum would be Visual C++ forum). But anyway... Here is some quick notes: 1) #include "CRC2.h" --> #include "CRC32.h" ? 2) Also some other includes seem to be missing. I guess that they didn't copy to your message. PBM_SETPOS, PBM_SETRANGE32 --> CommCtrl.h PERCENT --> Unkonwn include _O_RDONLY, _O_SEQUENTIAL, _O_BINARY, _SH_DENYWR --> File constants from fcntl.h _SH_DENYWR --> Sharing constant from share.h _tsopen --> Routine mapping from TCHAR.H _sopen --> open file for sharing from io.h 3) LPCRCStruct --> LPCRCSTRUCT (C++ is case sensitive) 4) MaxPath --> Normally MAX_PATH 5) close(theFile) --> close(theFile); 6) _lseekie64 --> _lseeki64 7) ::PostMessage(Progress, PBM_SETPOS, PERCENT, 0); --> ::PostMessage(Progress, PBM_SETPOS, percent, 0); 8) int percent = (int) (((long double)done / (long double)length) * 100); --> You need to calculate length from somewhere. 9) pCRCSt->hWND --> pCRCSt->hWnd 10) if (Handle --> if (Handle) 11) void Calculate (const LPBYTE buffer, UINT Size, ULONG &crc); --> Where is method definition? My include list in stdafx.h: #include <io.h> #include <tchar.h> #include <windows.h> #include <CommCtrl.h> #include <fcntl.h> #include <share.h> #include <TCHAR.H> Some includes might be unnecessary. These changes should compile files - but I don't have any idea is that doing what it is supposed to do. There is also some ready CRC32 function implementations here in code project. For example: CRC32: Generating a checksum for a file[^]. If you want to develope managed code, you should check out Cyclic Redundancy Check (CRC32) HashAlgorithm[^]. There is also more implementations and examples - just try search.
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This code doesn't seem to be Managed C++ - just normal Visual C++ code (so proper forum would be Visual C++ forum). But anyway... Here is some quick notes: 1) #include "CRC2.h" --> #include "CRC32.h" ? 2) Also some other includes seem to be missing. I guess that they didn't copy to your message. PBM_SETPOS, PBM_SETRANGE32 --> CommCtrl.h PERCENT --> Unkonwn include _O_RDONLY, _O_SEQUENTIAL, _O_BINARY, _SH_DENYWR --> File constants from fcntl.h _SH_DENYWR --> Sharing constant from share.h _tsopen --> Routine mapping from TCHAR.H _sopen --> open file for sharing from io.h 3) LPCRCStruct --> LPCRCSTRUCT (C++ is case sensitive) 4) MaxPath --> Normally MAX_PATH 5) close(theFile) --> close(theFile); 6) _lseekie64 --> _lseeki64 7) ::PostMessage(Progress, PBM_SETPOS, PERCENT, 0); --> ::PostMessage(Progress, PBM_SETPOS, percent, 0); 8) int percent = (int) (((long double)done / (long double)length) * 100); --> You need to calculate length from somewhere. 9) pCRCSt->hWND --> pCRCSt->hWnd 10) if (Handle --> if (Handle) 11) void Calculate (const LPBYTE buffer, UINT Size, ULONG &crc); --> Where is method definition? My include list in stdafx.h: #include <io.h> #include <tchar.h> #include <windows.h> #include <CommCtrl.h> #include <fcntl.h> #include <share.h> #include <TCHAR.H> Some includes might be unnecessary. These changes should compile files - but I don't have any idea is that doing what it is supposed to do. There is also some ready CRC32 function implementations here in code project. For example: CRC32: Generating a checksum for a file[^]. If you want to develope managed code, you should check out Cyclic Redundancy Check (CRC32) HashAlgorithm[^]. There is also more implementations and examples - just try search.
Hi, Thanks for the reply. I had implement my codes as per your advise. Few more questions: what do you mean by:- 8) int percent = (int) (((long double)done / (long double)length) * 100); --> You need to calculate length from somewhere. 11) void Calculate (const LPBYTE buffer, UINT Size, ULONG &crc); --> Where is method definition? (any more clear example to explain above two?) After debugging(implemented code as follwoing), I have an error now which is as I underline in my code (prompt me erroe 2065, 'lenght': undeclared identifier, error executing cl.exe). How can I solve this? //header file remain the same as previsous sent #include "CRC32.h" #include #include #include #include #include #include #include #define BUFFERSIZE 102400 DWORD WINAPI CRC_32::CRC32ThreadProc(LPVOID lpVoid) { LPCRCSTRUCT pCRCSt = (LPCRCSTRUCT)lpVoid; ULONG CRC = 0xFFFFFFFF; HWND Progress = NULL; if (::IsWindow(pCRCSt->hWnd)) { Progress = pCRCSt->hWnd; ::PostMessage(Progress, PBM_SETPOS, 0,0); ::PostMessage(Progress, PBM_SETRANGE32, 0, 100); } if (pCRCSt->pByte) { for (UINT offset = 0; offset < pCRCSt->size; offset += BUFFERSIZE) { pCRCSt->pCRC_32->Calculate(pCRCSt->pByte + offset, (pCRCSt->size - offset > BUFFERSIZE) ? BUFFERSIZE : (pCRCSt->size - offset), CRC); if (::IsWindow(Progress)) { int percent = offset > pCRCSt->size ? 100 : (int)(((double) offset / (double)pCRCSt->size) * 100); ::PostMessage(Progress, PBM_SETPOS, percent, 0); } } } else if (pCRCSt->FileName) { LONGLONG done = 0; UINT size = BUFFERSIZE; BYTE buffer [BUFFERSIZE]; int theFile = _tsopen(pCRCSt->FileName, _O_RDONLY | _O_SEQUENTIAL | _O_BINARY, _SH_DENYWR); if (theFile != -1) { _lseeki64 (theFile, 0L, SEEK_SET); while (size == BUFFERSIZE) { size = _read(theFile, buffer, BUFFERSIZE); if (size) { pCRCSt->pCRC_32->Calculate(buffer, size, CRC); if (::IsWindow(Progress)) { //update progcess bar done += size; int percent = (int) (((long double)done / (long double)length) * 100); ::PostMessage(Progress, PBM_SETPOS, percent, 0); } } } close(theFile); } } CRC ^= 0xFFFFFFFF; if (IsWindow(Progress)) ::PostMessage(::GetParent(Progress), WM_CRC_THREAD_DONE, (WPARAM)pCRCSt->Thread, CRC); delete pCRCSt->pByte; delete pCRCSt
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Hi, Thanks for the reply. I had implement my codes as per your advise. Few more questions: what do you mean by:- 8) int percent = (int) (((long double)done / (long double)length) * 100); --> You need to calculate length from somewhere. 11) void Calculate (const LPBYTE buffer, UINT Size, ULONG &crc); --> Where is method definition? (any more clear example to explain above two?) After debugging(implemented code as follwoing), I have an error now which is as I underline in my code (prompt me erroe 2065, 'lenght': undeclared identifier, error executing cl.exe). How can I solve this? //header file remain the same as previsous sent #include "CRC32.h" #include #include #include #include #include #include #include #define BUFFERSIZE 102400 DWORD WINAPI CRC_32::CRC32ThreadProc(LPVOID lpVoid) { LPCRCSTRUCT pCRCSt = (LPCRCSTRUCT)lpVoid; ULONG CRC = 0xFFFFFFFF; HWND Progress = NULL; if (::IsWindow(pCRCSt->hWnd)) { Progress = pCRCSt->hWnd; ::PostMessage(Progress, PBM_SETPOS, 0,0); ::PostMessage(Progress, PBM_SETRANGE32, 0, 100); } if (pCRCSt->pByte) { for (UINT offset = 0; offset < pCRCSt->size; offset += BUFFERSIZE) { pCRCSt->pCRC_32->Calculate(pCRCSt->pByte + offset, (pCRCSt->size - offset > BUFFERSIZE) ? BUFFERSIZE : (pCRCSt->size - offset), CRC); if (::IsWindow(Progress)) { int percent = offset > pCRCSt->size ? 100 : (int)(((double) offset / (double)pCRCSt->size) * 100); ::PostMessage(Progress, PBM_SETPOS, percent, 0); } } } else if (pCRCSt->FileName) { LONGLONG done = 0; UINT size = BUFFERSIZE; BYTE buffer [BUFFERSIZE]; int theFile = _tsopen(pCRCSt->FileName, _O_RDONLY | _O_SEQUENTIAL | _O_BINARY, _SH_DENYWR); if (theFile != -1) { _lseeki64 (theFile, 0L, SEEK_SET); while (size == BUFFERSIZE) { size = _read(theFile, buffer, BUFFERSIZE); if (size) { pCRCSt->pCRC_32->Calculate(buffer, size, CRC); if (::IsWindow(Progress)) { //update progcess bar done += size; int percent = (int) (((long double)done / (long double)length) * 100); ::PostMessage(Progress, PBM_SETPOS, percent, 0); } } } close(theFile); } } CRC ^= 0xFFFFFFFF; if (IsWindow(Progress)) ::PostMessage(::GetParent(Progress), WM_CRC_THREAD_DONE, (WPARAM)pCRCSt->Thread, CRC); delete pCRCSt->pByte; delete pCRCSt
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You don't declare and give value for "length". This is why you get error C2065. For example:
int main()
{
// This causes error C2065, because compiler doesn't know
// identifier "x".
int i = 100 * x;
}
To solve problem:
int main() { // Here we declare (tell compiler that identifier "x" means integer value) and // define (tell compiler that identifier "x" value is 1) identifier "x" int x = 1; // Now this doesn't cause any problems, because compiler a) knows identifier x and // b) there is assigned value for identifier "x" (actually C++ compiler doesn't know // this, and forgetting to give actuall value for identifier "x" would cause random // runtime behaviour a.k.a. bugs) int i = 100 * x; }Here is one possible way to calculate length.
LONGLONG done = 0; UINT size = BUFFERSIZE; BYTE buffer[BUFFERSIZE]; int theFile = _tsopen(pCRCSt->FileName, _O_RDONLY | _O_SEQUENTIAL | _O_BINARY, _SH_DENYWR); if (theFile != -1) { // Getting file length and storing it to length value. // // SEEK_END sets position to the end of file. // // _lseek returns the offset in a 64-bit integer, in bytes, of the new position // from the beginning of the file (in this case it returns length of file, // because we set seek position to END OF FILE). // long length = _lseeki64( theFile, 0L, SEEK_END ); if( length == -1L ) { // The function returns –1L to indicate an error and sets errno. // Avoid file processing, but close file size = 0L; // Specific error handlers switch( errno ) { case EBADF: // File descriptor is invalid // TODO: ADD EXTRA ERROR HANDLING // For example: throw exception or show message box for user. break; case EINVAL: // Value for origin is invalid or the position // specified by offset is before the beginning of the file. // TODO: ADD EXTRA ERROR HANDLING // For example: throw exception or show message box for user. break; default: // Unknown error code // TODO: ADD EXTRA ERROR HANDLING // For example: throw exception or show message box for user. break; } } if( length <= 0 ) { // On devices incapable of // seeking (such as terminals and printers), the return value // is undefined. length = 1L; } // Move file reading position to beginning of the file. _lseeki64 (theFile, 0L, SEEK_SET); while (size == BUFFERSIZE) { s -
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You don't declare and give value for "length". This is why you get error C2065. For example:
int main()
{
// This causes error C2065, because compiler doesn't know
// identifier "x".
int i = 100 * x;
}
To solve problem:
int main() { // Here we declare (tell compiler that identifier "x" means integer value) and // define (tell compiler that identifier "x" value is 1) identifier "x" int x = 1; // Now this doesn't cause any problems, because compiler a) knows identifier x and // b) there is assigned value for identifier "x" (actually C++ compiler doesn't know // this, and forgetting to give actuall value for identifier "x" would cause random // runtime behaviour a.k.a. bugs) int i = 100 * x; }Here is one possible way to calculate length.
LONGLONG done = 0; UINT size = BUFFERSIZE; BYTE buffer[BUFFERSIZE]; int theFile = _tsopen(pCRCSt->FileName, _O_RDONLY | _O_SEQUENTIAL | _O_BINARY, _SH_DENYWR); if (theFile != -1) { // Getting file length and storing it to length value. // // SEEK_END sets position to the end of file. // // _lseek returns the offset in a 64-bit integer, in bytes, of the new position // from the beginning of the file (in this case it returns length of file, // because we set seek position to END OF FILE). // long length = _lseeki64( theFile, 0L, SEEK_END ); if( length == -1L ) { // The function returns –1L to indicate an error and sets errno. // Avoid file processing, but close file size = 0L; // Specific error handlers switch( errno ) { case EBADF: // File descriptor is invalid // TODO: ADD EXTRA ERROR HANDLING // For example: throw exception or show message box for user. break; case EINVAL: // Value for origin is invalid or the position // specified by offset is before the beginning of the file. // TODO: ADD EXTRA ERROR HANDLING // For example: throw exception or show message box for user. break; default: // Unknown error code // TODO: ADD EXTRA ERROR HANDLING // For example: throw exception or show message box for user. break; } } if( length <= 0 ) { // On devices incapable of // seeking (such as terminals and printers), the return value // is undefined. length = 1L; } // Move file reading position to beginning of the file. _lseeki64 (theFile, 0L, SEEK_SET); while (size == BUFFERSIZE) { sHegot the code from http://www.codeproject.com/cpp/crc32_large.asp[^] I do not know why he didn't ask his question in the article forum there, instead of posting partial code here:confused:
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](http://www.canucks.com)Sonork 100.11743 Chicken Little "You're obviously a superstar." - Christian Graus about me - 12 Feb '03 Within you lies the power for good - Use it!
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