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;
}
