protected async Task InternalInitAsync(CancellationToken cancel = default)
{
cancel.ThrowIfCancellationRequested();
try
{
bool newFille = false;
LargeFileSystem.ParsedPath?lastFileParsed = InitialRelatedFiles.OrderBy(x => x.FileNumber).LastOrDefault();
if (lastFileParsed == null)
{
// New file
CurrentFileSize = 0;
newFille = true;
if (FileParams.Mode == FileMode.Open || FileParams.Mode == FileMode.Truncate)
{
throw new IOException($"The file '{FileParams.Path}' not found.");
}
}
else
{
// File exists
if (FileParams.Mode == FileMode.CreateNew)
{
throw new IOException($"The file '{FileParams.Path}' already exists.");
}
checked
{
long sizeOfLastFile = (await UnderlayFileSystem.GetFileMetadataAsync(lastFileParsed.PhysicalFilePath, FileMetadataGetFlags.NoAlternateStream | FileMetadataGetFlags.NoSecurity, cancel)).Size;
sizeOfLastFile = Math.Min(sizeOfLastFile, LargeFileSystem.Params.MaxSinglePhysicalFileSize);
CurrentFileSize = lastFileParsed.FileNumber * LargeFileSystem.Params.MaxSinglePhysicalFileSize + sizeOfLastFile;
}
}
if (FileParams.Mode == FileMode.Create || FileParams.Mode == FileMode.CreateNew || FileParams.Mode == FileMode.Truncate)
{
if (lastFileParsed != null)
{
// Delete the files first
await LargeFileSystem.DeleteFileAsync(FileParams.Path, FileFlags.ForceClearReadOnlyOrHiddenBitsOnNeed, cancel);
lastFileParsed = null;
CurrentFileSize = 0;
newFille = true;
}
}
long currentPosition = 0;
if (FileParams.Mode == FileMode.Append)
{
currentPosition = this.CurrentFileSize;
}
InitAndCheckFileSizeAndPosition(currentPosition, await GetFileSizeImplAsync(cancel), cancel);
if (newFille)
{
await using (var handle = await GetUnderlayRandomAccessHandle(0, cancel))
{
}
}
}
catch
{
throw;
}
}