public override int Read(Span <byte> destination, long offset, ReadOption options)
{
long inPos = offset;
int outPos = 0;
int remaining = ValidateReadParamsAndGetSize(destination, offset);
while (remaining > 0)
{
int fileIndex = GetSubFileIndexFromOffset(offset);
IFile file = Sources[fileIndex];
long fileOffset = offset - fileIndex * SubFileSize;
long fileEndOffset = Math.Min((fileIndex + 1) * SubFileSize, GetSize());
int bytesToRead = (int)Math.Min(fileEndOffset - inPos, remaining);
int bytesRead = file.Read(destination.Slice(outPos, bytesToRead), fileOffset, options);
outPos += bytesRead;
inPos += bytesRead;
remaining -= bytesRead;
if (bytesRead < bytesToRead)
{
break;
}
}
return(outPos);
}
public override int Read(Span <byte> destination, long offset, ReadOption options)
{
#if STREAM_SPAN
lock (Locker)
{
if (BaseStream.Position != offset)
{
BaseStream.Position = offset;
}
return(BaseStream.Read(destination));
}
#else
byte[] buffer = ArrayPool <byte> .Shared.Rent(destination.Length);
try
{
int bytesRead;
lock (Locker)
{
if (BaseStream.Position != offset)
{
BaseStream.Position = offset;
}
bytesRead = BaseStream.Read(buffer, 0, destination.Length);
}
new Span <byte>(buffer, 0, destination.Length).CopyTo(destination);
return(bytesRead);
}
finally { ArrayPool <byte> .Shared.Return(buffer); }
#endif
}
public override int Read(Span <byte> destination, long offset, ReadOption options)
{
int toRead = ValidateReadParamsAndGetSize(destination, offset);
File.Read(destination.Slice(0, toRead), offset, options);
return(toRead);
}
public override int Read(Span <byte> destination, long offset, ReadOption options)
{
int toRead = ValidateReadParamsAndGetSize(destination, offset);
long storageOffset = Offset + offset;
BaseStorage.Read(destination.Slice(0, toRead), storageOffset);
return(toRead);
}
public int ReadFile(FileHandle handle, Span <byte> destination, long offset, ReadOption option)
{
int bytesRead;
if (IsEnabledAccessLog() && IsEnabledHandleAccessLog(handle))
{
TimeSpan startTime = Time.GetCurrent();
bytesRead = handle.File.Read(destination, offset, option);
TimeSpan endTime = Time.GetCurrent();
OutputAccessLog(startTime, endTime, handle, $", offset: {offset}, size: {destination.Length}");
}
else
{
bytesRead = handle.File.Read(destination, offset, option);
}
return(bytesRead);
}
public Result Read(out long bytesRead, long offset, Span <byte> destination, ReadOption options)
{
bytesRead = default;
if (IsDisposed)
{
return(ResultFs.PreconditionViolation.Log());
}
if (destination.Length == 0)
{
return(Result.Success);
}
if (offset < 0)
{
return(ResultFs.ValueOutOfRange.Log());
}
return(ReadImpl(out bytesRead, offset, destination, options));
}
public override int Read(Span <byte> destination, long offset, ReadOption options)
{
return(BaseFile.Read(destination, offset, options));
}
public Result ReadFile(out long bytesRead, FileHandle handle, long offset, Span <byte> destination, ReadOption option)
{
Result rc;
if (IsEnabledAccessLog() && IsEnabledHandleAccessLog(handle))
{
TimeSpan startTime = Time.GetCurrent();
rc = handle.File.Read(out bytesRead, offset, destination, option);
TimeSpan endTime = Time.GetCurrent();
OutputAccessLog(rc, startTime, endTime, handle, $", offset: {offset}, size: {destination.Length}");
}
else
{
rc = handle.File.Read(out bytesRead, offset, destination, option);
}
return(rc);
}
public Result ReadFile(FileHandle handle, long offset, Span <byte> destination, ReadOption option)
{
Result rc = ReadFile(out long bytesRead, handle, offset, destination, option);
if (rc.IsFailure())
{
return(rc);
}
if (bytesRead == destination.Length)
{
return(Result.Success);
}
return(ResultFs.OutOfRange.Log());
}
public abstract int Read(Span <byte> destination, long offset, ReadOption options);
protected override Result ReadImpl(out long bytesRead, long offset, Span <byte> destination, ReadOption options)
{
if (!Mode.HasFlag(OpenMode.Read))
{
bytesRead = 0;
return(ResultFs.InvalidOpenModeForRead.Log());
}
return(BaseStream.Read(out bytesRead, offset, destination));
}
protected abstract Result ReadImpl(out long bytesRead, long offset, Span <byte> destination, ReadOption options);
