bool QFileStream::_OpenPlatformImplementation(const QPath &filePath, const EQFileOpenMode &eOpenMode, const bool bIsWritingAllowed, QFileStream::NativeHandle &handle, EQFileSystemError &eErrorInfo)
{
bool bSuccess = true;
using Kinesis::QuimeraEngine::Common::DataTypes::QArrayResult;
using Kinesis::QuimeraEngine::Common::DataTypes::i8_q;
using Kinesis::QuimeraEngine::Common::DataTypes::EQTextEncoding;
QArrayResult<i8_q> szPath = filePath.ToString().ToBytes(EQTextEncoding::E_UTF8);
int nAccess = bIsWritingAllowed ? O_RDWR:
O_RDONLY;
int nPermissions = S_IRWXU; // Read, write and execution permissions for the owner
int nOpenMode = 0;
switch(eOpenMode)
{
case EQFileOpenMode::E_Append:
case EQFileOpenMode::E_Open:
nOpenMode = 0;
break;
case EQFileOpenMode::E_Create:
nOpenMode = O_CREAT | O_EXCL;
break;
case EQFileOpenMode::E_CreateOrOverwrite:
nOpenMode = O_CREAT | O_TRUNC;
break;
case EQFileOpenMode::E_OpenOrCreate:
nOpenMode = O_CREAT;
break;
default:
break;
}
handle = open(szPath.Get(), nAccess | nOpenMode, nPermissions);
const bool FILE_OPENED_SUCCESSFULLY = handle >= 0;
if(!FILE_OPENED_SUCCESSFULLY)
{
bSuccess = false;
error_t lastError = errno;
QE_ASSERT_ERROR(handle >= 0, string_q("An unexpected error occurred when opening the file \"") + filePath.GetAbsolutePath() + "\". The error code was: " + string_q::FromInteger(lastError) + ".");
if(lastError == EACCES)
eErrorInfo = EQFileSystemError::E_NoPermissions;
else
eErrorInfo = EQFileSystemError::E_Unknown;
}
return bSuccess;
}
bool QFileStream::_ClosePlarformImplementation(const QFileStream::NativeHandle &handle, const QPath &filePath)
{
bool bSuccess = true;
int nResult = close(handle);
if(nResult < 0)
{
bSuccess = false;
error_t lastError = errno;
QE_ASSERT_ERROR(nResult >= 0, string_q("An unexpected error occurred when closing the file \"") + filePath.GetAbsolutePath() + "\". The error code was: " + string_q::FromInteger(lastError) + ".");
}
return bSuccess;
}
bool QFileStream::_WritePlatformImplementation(const void* pInputBuffer, const pointer_uint_q uNumberOfBytes, const pointer_uint_q uFileOffset, const QFileStream::NativeHandle &handle, const QPath &filePath)
{
bool bSuccess = true;
ssize_t nResult = pwrite(handle, pInputBuffer, uNumberOfBytes, uFileOffset);
if(nResult < 0)
{
bSuccess = false;
error_t lastError = errno;
QE_ASSERT_ERROR(nResult >= 0, string_q("An unexpected error occurred when writing to the file \"") + filePath.GetAbsolutePath() + "\". The error code was: " + string_q::FromInteger(lastError) + ".");
}
return bSuccess;
}
bool QFileStream::_ClosePlarformImplementation(const QFileStream::NativeHandle &handle, const QPath &filePath)
{
bool bSuccess = true;
static const BOOL CLOSE_OPERATION_FAILED = 0;
BOOL uCloseHandleResult = ::CloseHandle(handle);
if(uCloseHandleResult == CLOSE_OPERATION_FAILED)
{
bSuccess = false;
DWORD uCloseHandleLastError = ::GetLastError();
QE_ASSERT_ERROR(uCloseHandleResult != 0, string_q("An unexpected error occurred when closing the file \"") + filePath.GetAbsolutePath() + "\". The error code was: " + string_q::FromInteger(uCloseHandleLastError) + ".");
}
return bSuccess;
}
bool QFileStream::_OpenPlatformImplementation(const QPath &filePath, const EQFileOpenMode &eOpenMode, const bool bIsWritingAllowed, QFileStream::NativeHandle &handle, EQFileSystemError &eErrorInfo)
{
bool bSuccess = true;
using Kinesis::QuimeraEngine::Common::DataTypes::QArrayResult;
using Kinesis::QuimeraEngine::Common::DataTypes::i8_q;
QArrayResult<i8_q> arPath = filePath.ToString().ToBytes(string_q::GetLocalEncodingUTF16());
const wchar_t* szPath = rcast_q(arPath.Get(), wchar_t*);
DWORD uAccess = bIsWritingAllowed ? GENERIC_READ | GENERIC_WRITE :
GENERIC_READ;
DWORD uOpenMode = 0;
switch(eOpenMode)
{
case EQFileOpenMode::E_Append:
case EQFileOpenMode::E_Open:
uOpenMode = OPEN_EXISTING;
break;
case EQFileOpenMode::E_Create:
uOpenMode = CREATE_NEW;
break;
case EQFileOpenMode::E_CreateOrOverwrite:
uOpenMode = CREATE_ALWAYS;
break;
case EQFileOpenMode::E_OpenOrCreate:
uOpenMode = OPEN_ALWAYS;
break;
default:
break;
}
handle = ::CreateFileW(szPath, uAccess, FILE_SHARE_READ, NULL, uOpenMode, FILE_FLAG_RANDOM_ACCESS, NULL);
const bool FILE_OPENED_SUCCESSFULLY = handle != INVALID_HANDLE_VALUE;
if(!FILE_OPENED_SUCCESSFULLY)
{
bSuccess = false;
DWORD uCreateFileWLastError = ::GetLastError();
QE_ASSERT_ERROR(handle != INVALID_HANDLE_VALUE, string_q("An unexpected error occurred when opening the file \"") + filePath.GetAbsolutePath() + "\". The error code was: " + string_q::FromInteger(uCreateFileWLastError) + ".");
if(uCreateFileWLastError == ERROR_ACCESS_DENIED)
eErrorInfo = EQFileSystemError::E_NoPermissions;
else
eErrorInfo = EQFileSystemError::E_Unknown;
}
return bSuccess;
}
bool QFileStream::_WritePlatformImplementation(const void* pInputBuffer, const pointer_uint_q uNumberOfBytes, const pointer_uint_q uFileOffset, const QFileStream::NativeHandle &handle, const QPath &filePath)
{
bool bSuccess = true;
OVERLAPPED offsets;
memset(&offsets, 0, sizeof(OVERLAPPED)); // The structure MUST be zero-initialized
// Sets the offset from where to start reading
#if QE_OS_WINDOWS == 32
offsets.Offset = uFileOffset;
offsets.OffsetHigh = 0;
#elif QE_OS_WINDOWS == 64
const u32_q* pPosition = rcast_q(&uFileOffset, const u32_q*);
#if QE_ENDIANNESS == QE_ENDIANNESS_LITTLEENDIAN
offsets.Offset = pPosition[1];
offsets.OffsetHigh = pPosition[0];
#elif QE_ENDIANNESS == QE_ENDIANNESS_BIGENDIAN
offsets.Offset = pPosition[0];
offsets.OffsetHigh = pPosition[1];
#endif
#endif
static const BOOL WRITE_OPERATION_FAILED = 0;
BOOL uWriteFileResult = ::WriteFile(handle, pInputBuffer, uNumberOfBytes, NULL, &offsets);
if(uWriteFileResult == WRITE_OPERATION_FAILED)
{
bSuccess = false;
DWORD uWriteFileLastError = ::GetLastError();
QE_ASSERT_WARNING(uWriteFileResult != WRITE_OPERATION_FAILED, string_q("An unexpected error occurred when writing to the file \"") + filePath.GetAbsolutePath() + "\". The error code was: " + string_q::FromInteger(uWriteFileLastError) + ".");
}
return bSuccess;
}
EQFileSystemError QFileStream::Open(const QPath &filePath, const EQFileOpenMode &eOpenMode)
{
QE_ASSERT_ERROR(m_bIsOpen != true, "The file stream is already open.");
EQFileSystemError eErrorInfo = EQFileSystemError::E_Unknown;
const bool FILE_EXISTS = SQFile::Exists(filePath, eErrorInfo);
if((FILE_EXISTS && (eOpenMode == EQFileOpenMode::E_Append || eOpenMode == EQFileOpenMode::E_Open)) ||
(!FILE_EXISTS && eOpenMode == EQFileOpenMode::E_Create) ||
eOpenMode == EQFileOpenMode::E_CreateOrOverwrite ||
eOpenMode == EQFileOpenMode::E_OpenOrCreate)
{
if(FILE_EXISTS)
{
QFileInfo fileInfo = SQFile::GetFileInfo(filePath, eErrorInfo);
m_uFileSize = scast_q(fileInfo.GetSize(), pointer_uint_q);
m_bWritingIsAllowed = !fileInfo.IsReadOnly();
QE_ASSERT_ERROR(!(fileInfo.IsReadOnly() && eOpenMode == EQFileOpenMode::E_CreateOrOverwrite), string_q("The current user does not have permissions to overwrite the file \"") + filePath.GetAbsolutePath() + "\".");
}
else
{
m_uFileSize = 0;
m_bWritingIsAllowed = true;
}
m_path = filePath;
bool bOperationSuccessful = QFileStream::_OpenPlatformImplementation(m_path, eOpenMode, m_bWritingIsAllowed, m_nativeHandle, eErrorInfo);
if(bOperationSuccessful)
{
m_bIsOpen = true;
eErrorInfo = EQFileSystemError::E_Success;
if(eOpenMode == EQFileOpenMode::E_Append)
this->SetPosition(m_uFileSize);
else
this->SetPosition(0);
QE_ASSERT_WARNING(m_uFileSize <= pointer_uint_q(-1), "The the file is too large, this class cannot access file offsets over 2^32 - 1 when it is compiled for x86 architecture.");
if(m_uFileSize > pointer_uint_q(-1))
{
eErrorInfo = EQFileSystemError::E_FileIsTooLarge;
}
}
}
else if(FILE_EXISTS && eOpenMode == EQFileOpenMode::E_Create)
{
eErrorInfo = EQFileSystemError::E_AlreadyExists;
}
else
{
eErrorInfo = EQFileSystemError::E_DoesNotExist;
}
return eErrorInfo;
}