public void Extract(SequentialReader reader, HuffmanTablesDirectory directory)
{
try
{
while (reader.Available() > 0)
{
byte header = reader.GetByte();
HuffmanTableClass tableClass = HuffmanTable.TypeOf((header & 0xF0) >> 4);
int tableDestinationId = header & 0xF;
byte[] lBytes = GetBytes(reader, 16);
int vCount = 0;
foreach (byte b in lBytes)
{
vCount += (b & 0xFF);
}
byte[] vBytes = GetBytes(reader, vCount);
directory.AddTable(new HuffmanTable(tableClass, tableDestinationId, lBytes, vBytes));
}
}
catch (IOException me)
{
directory.AddError(me.ToString());
}
}
public DirectoryList ReadJpegSegments(IEnumerable <JpegSegment> segments)
{
// This Extract structure is a little different since we only want
// to return one HuffmanTablesDirectory for one-to-many segments
HuffmanTablesDirectory directory = null;
foreach (var segment in segments)
{
if (directory == null)
{
directory = new HuffmanTablesDirectory();
}
Extract(new SequentialByteArrayReader(segment.Bytes), directory);
}
if (directory != null)
{
return new List <Directory>()
{
directory
}
}
;
return(Directory.EmptyList);
}
