protected override async Task <FileObject> CreateFileImplAsync(FileParameters option, CancellationToken cancel = default)
{
string fileName = this.PathParser.GetFileName(option.Path);
if (fileName.IndexOf(Params.SplitStr) != -1)
{
throw new ApplicationException($"The original filename '{fileName}' contains '{Params.SplitStr}'.");
}
await using (CreatePerTaskCancellationToken(out CancellationToken operationCancel, cancel))
{
using (await AsyncLockObj.LockWithAwait(operationCancel))
{
cancel.ThrowIfCancellationRequested();
bool isSimplePhysicalFileExists = await UnderlayFileSystem.IsFileExistsAsync(option.Path);
if (isSimplePhysicalFileExists)
{
// If there is a simple physical file, open it.
return(await UnderlayFileSystem.CreateFileAsync(option, cancel));
}
ParsedPath[] relatedFiles = await GetPhysicalFileStateInternal(option.Path, operationCancel);
return(await LargeFileObject.CreateFileAsync(this, option, relatedFiles, operationCancel));
}
}
}
public Cursor(LargeFileObject o, long logicalPosision, long dataLength = 0)
{
checked
{
Lfo = o;
if (logicalPosision < 0)
{
throw new ArgumentOutOfRangeException("logicalPosision < 0");
}
if (dataLength < 0)
{
throw new ArgumentOutOfRangeException("dataLength < 0");
}
var p = Lfo.LargeFileSystem.Params;
if (logicalPosision > p.MaxLogicalFileSize)
{
throw new ArgumentOutOfRangeException("logicalPosision > MaxLogicalFileSize");
}
this.LogicalPosition = logicalPosision;
this.PhysicalFileNumber = this.LogicalPosition / p.MaxSinglePhysicalFileSize;
if (this.PhysicalFileNumber > p.MaxFileNumber)
{
throw new ArgumentOutOfRangeException($"this.PhysicalFileNumber ({this.PhysicalFileNumber}) > p.MaxFileNumber ({p.MaxFileNumber})");
}
this.PhysicalPosition = this.LogicalPosition % p.MaxSinglePhysicalFileSize;
this.PhysicalRemainingLength = p.MaxSinglePhysicalFileSize - this.PhysicalPosition;
this.PhysicalDataLength = Math.Min(this.PhysicalRemainingLength, dataLength);
}
}
public static async Task <FileObject> CreateFileAsync(LargeFileSystem fileSystem, FileParameters fileParams, LargeFileSystem.ParsedPath[] relatedFiles, CancellationToken cancel = default)
{
cancel.ThrowIfCancellationRequested();
LargeFileObject f = new LargeFileObject(fileSystem, fileParams, relatedFiles);
try
{
await f.InternalInitAsync(cancel);
}
catch
{
f._DisposeSafe();
throw;
}
return(f);
}