/// <summary>
/// This function reads data from the file and sends it to the
/// buffer stream to be sent to the burner. This function does not
/// return until all of the data from the file is read.
/// </summary>
/// <returns></returns>
public bool ReadData(int sector_size, long lba)
{
bool shortbuf = false;
int NumberRead;
int num_sectors;
bool first = true;
// This is the number of whole sectors that will fit into the buffer.
num_sectors = m_buffer_stream.PageSize / sector_size;
while (true)
{
WriteBuffer buf;
buf = m_buffer_stream.GetFreeBuffer();
if (!m_reader.ReadData(buf.BufferPtr, num_sectors * sector_size, out NumberRead))
{
return(false);
}
// If the read succeeded, but read zero bytes, we have reached the
// end of the file.
if (NumberRead == 0)
{
return(true);
}
if (shortbuf)
{
throw new Exception("read two short packets");
}
// Mark the buffer with the amount of data that has
// been read from the file
int sectors = NumberRead / sector_size;
if ((NumberRead % sector_size) != 0)
{
shortbuf = true;
sectors++;
}
if (first)
{
buf.SourceString = "First block from FileReader";
buf.LogicalBlockAddress = lba;
first = false;
}
else
{
buf.SourceString = "Not first block from FileReader";
buf.LogicalBlockAddress = long.MaxValue;
}
buf.SectorSize = sector_size;
buf.DataSize = sectors;
// Send the buffer to the device
m_buffer_stream.SendBufferToDevice(buf);
}
}
/// <summary>
///
/// </summary>
/// <param name="buffer"></param>
/// <param name="offset"></param>
/// <param name="count"></param>
public override void Write(byte[] buffer, int offset, int count)
{
while (count > 0)
{
if (m_buffer == null)
{
m_buffer = m_pool.GetFreeBuffer();
m_index = 0;
}
//
// Write up to the end of this buffer
//
int remaining = m_sector_count * m_sector_size - m_index;
if (remaining > count)
{
remaining = count;
}
IntPtr dest = new IntPtr(m_buffer.BufferPtr.ToInt32() + m_index);
Marshal.Copy(buffer, offset, dest, remaining);
m_index += remaining;
m_length += remaining;
count -= remaining;
offset += remaining;
if (m_index == m_sector_count * m_sector_size)
{
m_buffer.DataSize = m_index / m_sector_size;
m_buffer.SectorSize = m_sector_size;
m_buffer.LogicalBlockAddress = m_lba;
m_buffer.SourceString = "WriteBufferStream, Write method";
m_lba = long.MaxValue;
m_pool.SendBufferToDevice(m_buffer);
m_buffer = null;
}
}
}
