[DllImport("libgstreamer-0.10.dll") ]
static extern IntPtr gst_buffer_try_new_and_alloc (uint size);

public Buffer (Gst.GLib.Value val) : base (val) { }

public Buffer (uint size) {
  IntPtr raw = gst_buffer_try_new_and_alloc (size);
  if (raw == IntPtr.Zero)
    throw new OutOfMemoryException ();
  Raw = raw;
}

public Buffer (byte[] data) : this () {
  Data = data;
}

[DllImport ("gstreamersharpglue-0.10.dll") ]
extern static uint gstsharp_gst_buffer_get_data_offset ();
[DllImport ("gstreamersharpglue-0.10.dll") ]
extern static void gstsharp_gst_buffer_set_data (IntPtr handle, IntPtr data, uint size);
[DllImport ("libglib-2.0-0.dll") ]
extern static IntPtr g_try_malloc (int size);

static uint data_offset = gstsharp_gst_buffer_get_data_offset ();
public byte[] Data {
  get {
    IntPtr raw_ptr;
    unsafe {
      raw_ptr = * ( (IntPtr *) ( ( (byte*) Handle) + data_offset));
    }

    byte[] data = new byte[Size];
    Marshal.Copy (raw_ptr, data, 0, (int) Size);

    return data;
  }

  set {
    if (!IsWritable)
      throw new ApplicationException ();

    IntPtr raw_ptr = g_try_malloc (value.Length);
    if (raw_ptr == IntPtr.Zero)
      throw new OutOfMemoryException ();

    Marshal.Copy (value, 0, raw_ptr, value.Length);
    gstsharp_gst_buffer_set_data (Handle, raw_ptr, (uint) value.Length);
  }
}

public byte this [uint index] {
  get {
    if (index >= Size)
      throw new ArgumentOutOfRangeException ();

    unsafe {
      byte **raw_ptr = (byte **) ( ( (byte*) Handle) + data_offset);
      return * ( (*raw_ptr) + index);
    }
  }
  set {
    if (index >= Size)
      throw new ArgumentOutOfRangeException ();
    if (!IsWritable)
      throw new ApplicationException ();

    unsafe {
      byte **raw_ptr = (byte **) ( ( (byte*) Handle) + data_offset);
      * ( (*raw_ptr) + index) = value;
    }
  }
}

[DllImport ("libgstreamer-0.10.dll") ]
static extern void gst_mini_object_unref (IntPtr raw);

/* FIXME: This is not optimal */
public void MakeMetadataWritable() {
  if (IsMetadataWritable)
    return;

  IntPtr old = Handle;
  IntPtr sub = gst_buffer_create_sub (Handle, 0, Size);
  Raw = sub;
  gst_mini_object_unref (old);
}

[DllImport("libgstreamer-0.10.dll") ]
static extern IntPtr gst_buffer_get_caps (IntPtr raw);
[DllImport("libgstreamer-0.10.dll") ]
static extern void gst_buffer_set_caps (IntPtr raw, IntPtr caps);

public Gst.Caps Caps {
  get {
    IntPtr raw_ret = gst_buffer_get_caps (Handle);
    Gst.Caps ret = raw_ret == IntPtr.Zero ? null : (Gst.Caps) Gst.GLib.Opaque.GetOpaque (raw_ret, typeof (Gst.Caps), true);
    return ret;
  }
  set  {
    if (!IsMetadataWritable)
      throw new ApplicationException ();
    gst_buffer_set_caps (Handle, value == null ? IntPtr.Zero : value.Handle);
  }
}

[DllImport ("gstreamersharpglue-0.10.dll") ]
extern static uint gstsharp_gst_buffer_get_timestamp_offset ();
static uint timestamp_offset = gstsharp_gst_buffer_get_timestamp_offset ();

public ulong Timestamp {
  get {
    unsafe {
      ulong *raw_ptr = ( (ulong*) ( ( (byte*) Handle) + timestamp_offset));
      return *raw_ptr;
    }
  }

  set {
    if (!IsMetadataWritable)
      throw new ApplicationException ();

    unsafe {
      ulong *raw_ptr = ( (ulong*) ( ( (byte*) Handle) + timestamp_offset));
      *raw_ptr = value;
    }
  }
}

[DllImport ("gstreamersharpglue-0.10.dll") ]
extern static uint gstsharp_gst_buffer_get_duration_offset ();
static uint duration_offset = gstsharp_gst_buffer_get_duration_offset ();

public ulong Duration {
  get {
    unsafe {
      ulong *raw_ptr = ( (ulong*) ( ( (byte*) Handle) + duration_offset));
      return *raw_ptr;
    }
  }

  set {
    if (!IsMetadataWritable)
      throw new ApplicationException ();

    unsafe {
      ulong *raw_ptr = ( (ulong*) ( ( (byte*) Handle) + duration_offset));
      *raw_ptr = value;
    }
  }
}

[DllImport ("gstreamersharpglue-0.10.dll") ]
extern static uint gstsharp_gst_buffer_get_offset_offset ();
static uint offset_offset = gstsharp_gst_buffer_get_offset_offset ();

public ulong Offset {
  get {
    unsafe {
      ulong *raw_ptr = ( (ulong*) ( ( (byte*) Handle) + offset_offset));
      return *raw_ptr;
    }
  }

  set {
    if (!IsMetadataWritable)
      throw new ApplicationException ();

    unsafe {
      ulong *raw_ptr = ( (ulong*) ( ( (byte*) Handle) + offset_offset));
      *raw_ptr = value;
    }
  }
}

[DllImport ("gstreamersharpglue-0.10.dll") ]
extern static uint gstsharp_gst_buffer_get_offset_end_offset ();
static uint offset_end_offset = gstsharp_gst_buffer_get_offset_end_offset ();

public ulong OffsetEnd {
  get {
    unsafe {
      ulong *raw_ptr = ( (ulong*) ( ( (byte*) Handle) + offset_end_offset));
      return *raw_ptr;
    }
  }

  set {
    if (!IsMetadataWritable)
      throw new ApplicationException ();

    unsafe {
      ulong *raw_ptr = ( (ulong*) ( ( (byte*) Handle) + offset_end_offset));
      *raw_ptr = value;
    }
  }
}

static Buffer () {
  Gst.GLib.GType.Register (Buffer.GType, typeof (Buffer));
}