private void InitStream(IntPtr fileStream, bool ownsHandle)
{
if (StdioFileStream.InvalidFileStream == fileStream)
{
throw new ArgumentException(Locale.GetText("Invalid file stream"), "fileStream");
}
this.file = fileStream;
this.owner = ownsHandle;
try
{
if ((long)Stdlib.fseek(this.file, (long)0, SeekFlags.SEEK_CUR) != (long)-1)
{
this.canSeek = true;
}
Stdlib.fread(IntPtr.Zero, (ulong)0, (ulong)0, this.file);
if (Stdlib.ferror(this.file) == 0)
{
this.canRead = true;
}
Stdlib.fwrite(IntPtr.Zero, (ulong)0, (ulong)0, this.file);
if (Stdlib.ferror(this.file) == 0)
{
this.canWrite = true;
}
Stdlib.clearerr(this.file);
}
catch (Exception exception)
{
throw new ArgumentException(Locale.GetText("Invalid file stream"), "fileStream");
}
GC.KeepAlive(this);
}
public override int Read([In][Out] byte[] buffer, int offset, int count)
{
unsafe
{
this.AssertNotDisposed();
this.AssertValidBuffer(buffer, offset, count);
if (!this.CanRead)
{
throw new NotSupportedException("Stream does not support reading");
}
ulong num = (ulong)0;
fixed(byte *numPointer = &buffer[offset])
{
num = Stdlib.fread(numPointer, (ulong)1, (ulong)count, this.file);
}
if (num != (long)count && Stdlib.ferror(this.file) != 0)
{
throw new IOException();
}
GC.KeepAlive(this);
return((int)num);
}
}