private static int GetPeriBase()
{
var fp = Stdlib.fopen(DeviceTreePath, DeviceTreeAccessMode);
if (fp == IntPtr.Zero)
{
return(0);
}
var buf = new byte[4];
// get peri base from device tree
Stdlib.fseek(fp, 4, SeekFlags.SEEK_SET);
var periBase = 0;
if (Stdlib.fread(buf, 1, (ulong)buf.Length, fp) == (ulong)buf.Length)
{
periBase = buf[0] << 24 | buf[1] << 16 | buf[2] << 8 | buf[3] << 0;
}
Stdlib.fclose(fp);
return(periBase);
}
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 long Seek(long offset, SeekOrigin origin)
{
this.AssertNotDisposed();
if (!this.CanSeek)
{
throw new NotSupportedException("The File Stream does not support seeking");
}
SeekFlags seekFlag = SeekFlags.SEEK_CUR;
switch (origin)
{
case SeekOrigin.Begin:
{
seekFlag = SeekFlags.SEEK_SET;
break;
}
case SeekOrigin.Current:
{
seekFlag = SeekFlags.SEEK_CUR;
break;
}
case SeekOrigin.End:
{
seekFlag = SeekFlags.SEEK_END;
break;
}
default:
{
throw new ArgumentException("origin");
}
}
if (Stdlib.fseek(this.file, offset, seekFlag) != 0)
{
throw new IOException("Unable to seek", UnixMarshal.CreateExceptionForLastError());
}
long num = Stdlib.ftell(this.file);
if (num == (long)-1)
{
throw new IOException("Unable to get current file position", UnixMarshal.CreateExceptionForLastError());
}
GC.KeepAlive(this);
return(num);
}