318 lines
9.4 KiB
C++
318 lines
9.4 KiB
C++
// Windows/FileIO.cpp
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#include "StdAfx.h"
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#include "FileIO.h"
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#include "Defs.h"
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#ifdef WIN_LONG_PATH
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#include "../Common/MyString.h"
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#endif
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#ifndef _UNICODE
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#include "../Common/StringConvert.h"
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#endif
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#ifndef _UNICODE
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extern bool g_IsNT;
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#endif
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namespace NWindows {
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namespace NFile {
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#if defined(WIN_LONG_PATH) && defined(_UNICODE)
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#define WIN_LONG_PATH2
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#endif
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#ifdef WIN_LONG_PATH
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bool GetLongPathBase(LPCWSTR s, UString &res)
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{
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res.Empty();
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int len = MyStringLen(s);
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wchar_t c = s[0];
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if (len < 1 || c == L'\\' || c == L'.' && (len == 1 || len == 2 && s[1] == L'.'))
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return true;
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UString curDir;
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bool isAbs = false;
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if (len > 3)
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isAbs = (s[1] == L':' && s[2] == L'\\' && (c >= L'a' && c <= L'z' || c >= L'A' && c <= L'Z'));
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if (!isAbs)
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{
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DWORD needLength = ::GetCurrentDirectoryW(MAX_PATH + 1, curDir.GetBuffer(MAX_PATH + 1));
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curDir.ReleaseBuffer();
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if (needLength == 0 || needLength > MAX_PATH)
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return false;
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if (curDir[curDir.Length() - 1] != L'\\')
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curDir += L'\\';
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}
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res = UString(L"\\\\?\\") + curDir + s;
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return true;
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}
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bool GetLongPath(LPCWSTR path, UString &longPath)
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{
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if (GetLongPathBase(path, longPath))
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return !longPath.IsEmpty();
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return false;
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}
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#endif
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namespace NIO {
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CFileBase::~CFileBase() { Close(); }
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bool CFileBase::Create(LPCTSTR fileName, DWORD desiredAccess,
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DWORD shareMode, DWORD creationDisposition, DWORD flagsAndAttributes)
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{
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if (!Close())
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return false;
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_handle = ::CreateFile(fileName, desiredAccess, shareMode,
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(LPSECURITY_ATTRIBUTES)NULL, creationDisposition,
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flagsAndAttributes, (HANDLE)NULL);
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#ifdef WIN_LONG_PATH2
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if (_handle == INVALID_HANDLE_VALUE)
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{
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UString longPath;
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if (GetLongPath(fileName, longPath))
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_handle = ::CreateFileW(longPath, desiredAccess, shareMode,
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(LPSECURITY_ATTRIBUTES)NULL, creationDisposition,
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flagsAndAttributes, (HANDLE)NULL);
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}
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#endif
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return (_handle != INVALID_HANDLE_VALUE);
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}
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#ifndef _UNICODE
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bool CFileBase::Create(LPCWSTR fileName, DWORD desiredAccess,
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DWORD shareMode, DWORD creationDisposition, DWORD flagsAndAttributes)
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{
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if (!g_IsNT)
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return Create(UnicodeStringToMultiByte(fileName, ::AreFileApisANSI() ? CP_ACP : CP_OEMCP),
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desiredAccess, shareMode, creationDisposition, flagsAndAttributes);
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if (!Close())
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return false;
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_handle = ::CreateFileW(fileName, desiredAccess, shareMode,
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(LPSECURITY_ATTRIBUTES)NULL, creationDisposition,
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flagsAndAttributes, (HANDLE)NULL);
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#ifdef WIN_LONG_PATH
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if (_handle == INVALID_HANDLE_VALUE)
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{
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UString longPath;
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if (GetLongPath(fileName, longPath))
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_handle = ::CreateFileW(longPath, desiredAccess, shareMode,
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(LPSECURITY_ATTRIBUTES)NULL, creationDisposition,
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flagsAndAttributes, (HANDLE)NULL);
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}
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#endif
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return (_handle != INVALID_HANDLE_VALUE);
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}
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#endif
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bool CFileBase::Close()
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{
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if (_handle == INVALID_HANDLE_VALUE)
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return true;
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if (!::CloseHandle(_handle))
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return false;
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_handle = INVALID_HANDLE_VALUE;
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return true;
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}
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bool CFileBase::GetPosition(UInt64 &position) const
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{
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return Seek(0, FILE_CURRENT, position);
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}
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bool CFileBase::GetLength(UInt64 &length) const
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{
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DWORD sizeHigh;
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DWORD sizeLow = ::GetFileSize(_handle, &sizeHigh);
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if(sizeLow == 0xFFFFFFFF)
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if(::GetLastError() != NO_ERROR)
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return false;
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length = (((UInt64)sizeHigh) << 32) + sizeLow;
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return true;
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}
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bool CFileBase::Seek(Int64 distanceToMove, DWORD moveMethod, UInt64 &newPosition) const
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{
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LARGE_INTEGER value;
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value.QuadPart = distanceToMove;
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value.LowPart = ::SetFilePointer(_handle, value.LowPart, &value.HighPart, moveMethod);
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if (value.LowPart == 0xFFFFFFFF)
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if(::GetLastError() != NO_ERROR)
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return false;
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newPosition = value.QuadPart;
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return true;
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}
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bool CFileBase::Seek(UInt64 position, UInt64 &newPosition)
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{
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return Seek(position, FILE_BEGIN, newPosition);
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}
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bool CFileBase::SeekToBegin()
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{
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UInt64 newPosition;
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return Seek(0, newPosition);
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}
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bool CFileBase::SeekToEnd(UInt64 &newPosition)
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{
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return Seek(0, FILE_END, newPosition);
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}
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bool CFileBase::GetFileInformation(CByHandleFileInfo &fileInfo) const
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{
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BY_HANDLE_FILE_INFORMATION winFileInfo;
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if(!::GetFileInformationByHandle(_handle, &winFileInfo))
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return false;
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fileInfo.Attributes = winFileInfo.dwFileAttributes;
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fileInfo.CreationTime = winFileInfo.ftCreationTime;
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fileInfo.LastAccessTime = winFileInfo.ftLastAccessTime;
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fileInfo.LastWriteTime = winFileInfo.ftLastWriteTime;
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fileInfo.VolumeSerialNumber = winFileInfo.dwFileAttributes;
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fileInfo.Size = (((UInt64)winFileInfo.nFileSizeHigh) << 32) + winFileInfo.nFileSizeLow;
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fileInfo.NumberOfLinks = winFileInfo.nNumberOfLinks;
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fileInfo.FileIndex = (((UInt64)winFileInfo.nFileIndexHigh) << 32) + winFileInfo.nFileIndexLow;
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return true;
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}
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/////////////////////////
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// CInFile
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bool CInFile::Open(LPCTSTR fileName, DWORD shareMode, DWORD creationDisposition, DWORD flagsAndAttributes)
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{ return Create(fileName, GENERIC_READ, shareMode, creationDisposition, flagsAndAttributes); }
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bool CInFile::OpenShared(LPCTSTR fileName, bool shareForWrite)
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{ return Open(fileName, FILE_SHARE_READ | (shareForWrite ? FILE_SHARE_WRITE : 0), OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL); }
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bool CInFile::Open(LPCTSTR fileName)
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{ return OpenShared(fileName, false); }
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#ifndef _UNICODE
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bool CInFile::Open(LPCWSTR fileName, DWORD shareMode, DWORD creationDisposition, DWORD flagsAndAttributes)
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{ return Create(fileName, GENERIC_READ, shareMode, creationDisposition, flagsAndAttributes); }
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bool CInFile::OpenShared(LPCWSTR fileName, bool shareForWrite)
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{ return Open(fileName, FILE_SHARE_READ | (shareForWrite ? FILE_SHARE_WRITE : 0), OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL); }
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bool CInFile::Open(LPCWSTR fileName)
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{ return OpenShared(fileName, false); }
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#endif
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// ReadFile and WriteFile functions in Windows have BUG:
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// If you Read or Write 64MB or more (probably min_failure_size = 64MB - 32KB + 1)
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// from/to Network file, it returns ERROR_NO_SYSTEM_RESOURCES
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// (Insufficient system resources exist to complete the requested service).
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// Probably in some version of Windows there are problems with other sizes:
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// for 32 MB (maybe also for 16 MB).
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// And message can be "Network connection was lost"
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static UInt32 kChunkSizeMax = (1 << 22);
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bool CInFile::ReadPart(void *data, UInt32 size, UInt32 &processedSize)
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{
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if (size > kChunkSizeMax)
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size = kChunkSizeMax;
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DWORD processedLoc = 0;
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bool res = BOOLToBool(::ReadFile(_handle, data, size, &processedLoc, NULL));
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processedSize = (UInt32)processedLoc;
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return res;
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}
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bool CInFile::Read(void *data, UInt32 size, UInt32 &processedSize)
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{
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processedSize = 0;
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do
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{
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UInt32 processedLoc = 0;
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bool res = ReadPart(data, size, processedLoc);
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processedSize += processedLoc;
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if (!res)
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return false;
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if (processedLoc == 0)
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return true;
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data = (void *)((unsigned char *)data + processedLoc);
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size -= processedLoc;
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}
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while (size > 0);
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return true;
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}
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/////////////////////////
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// COutFile
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bool COutFile::Open(LPCTSTR fileName, DWORD shareMode, DWORD creationDisposition, DWORD flagsAndAttributes)
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{ return CFileBase::Create(fileName, GENERIC_WRITE, shareMode, creationDisposition, flagsAndAttributes); }
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static inline DWORD GetCreationDisposition(bool createAlways)
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{ return createAlways? CREATE_ALWAYS: CREATE_NEW; }
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bool COutFile::Open(LPCTSTR fileName, DWORD creationDisposition)
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{ return Open(fileName, FILE_SHARE_READ, creationDisposition, FILE_ATTRIBUTE_NORMAL); }
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bool COutFile::Create(LPCTSTR fileName, bool createAlways)
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{ return Open(fileName, GetCreationDisposition(createAlways)); }
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#ifndef _UNICODE
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bool COutFile::Open(LPCWSTR fileName, DWORD shareMode, DWORD creationDisposition, DWORD flagsAndAttributes)
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{ return CFileBase::Create(fileName, GENERIC_WRITE, shareMode, creationDisposition, flagsAndAttributes); }
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bool COutFile::Open(LPCWSTR fileName, DWORD creationDisposition)
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{ return Open(fileName, FILE_SHARE_READ, creationDisposition, FILE_ATTRIBUTE_NORMAL); }
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bool COutFile::Create(LPCWSTR fileName, bool createAlways)
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{ return Open(fileName, GetCreationDisposition(createAlways)); }
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#endif
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bool COutFile::SetTime(const FILETIME *creationTime, const FILETIME *lastAccessTime, const FILETIME *lastWriteTime)
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{ return BOOLToBool(::SetFileTime(_handle, creationTime, lastAccessTime, lastWriteTime)); }
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bool COutFile::SetLastWriteTime(const FILETIME *lastWriteTime)
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{ return SetTime(NULL, NULL, lastWriteTime); }
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bool COutFile::WritePart(const void *data, UInt32 size, UInt32 &processedSize)
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{
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if (size > kChunkSizeMax)
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size = kChunkSizeMax;
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DWORD processedLoc = 0;
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bool res = BOOLToBool(::WriteFile(_handle, data, size, &processedLoc, NULL));
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processedSize = (UInt32)processedLoc;
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return res;
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}
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bool COutFile::Write(const void *data, UInt32 size, UInt32 &processedSize)
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{
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processedSize = 0;
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do
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{
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UInt32 processedLoc = 0;
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bool res = WritePart(data, size, processedLoc);
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processedSize += processedLoc;
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if (!res)
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return false;
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if (processedLoc == 0)
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return true;
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data = (const void *)((const unsigned char *)data + processedLoc);
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size -= processedLoc;
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}
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while (size > 0);
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return true;
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}
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bool COutFile::SetEndOfFile() { return BOOLToBool(::SetEndOfFile(_handle)); }
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bool COutFile::SetLength(UInt64 length)
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{
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UInt64 newPosition;
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if(!Seek(length, newPosition))
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return false;
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if(newPosition != length)
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return false;
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return SetEndOfFile();
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}
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}}}
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