Added write analogues to the read methods in Bytestream.

lib/net/rtmp/bytestream.rb

@@ -15,29 +15,56 @@ def read_uint8
         read_and_unpack(1, 'C')
       end
 
+      def write_uint8(value)
+        write [value].pack('C')
+      end
+
       def read_uint16_be
         read_and_unpack(2, 'n')
       end
 
+      def write_uint16_be(value)
+        [value].pack('n')
+      end
+
       def read_uint24_be
         ("\x00" + read(3)).unpack('N')[0]
       end
 
+      def write_uint24_be(value)
+        write [value].pack('N')[1,3]
+      end
+
       def read_uint32_le
         read_and_unpack(4, 'V')
       end
 
+      def write_uint32_le(value)
+        write [value].pack('V')
+      end
+
       def read_double_be
         read_and_unpack(8, 'G')
       end
 
+      def write_double_be
+        write [value].pack('G')
+      end
+
       def read_bitfield(*widths)
         byte = read_uint8
         shifts_and_masks(widths).map{ |shift, mask|
           (byte >> shift) & mask
         }
       end
 
+      def write_bitfield(*values_and_widths)
+        sm = shifts_and_masks(values_and_widths.map{ |_,w| w })
+        write_uint8 values_and_widths.zip(sm).inject(0){ |byte, ((value, width), (shift, mask))|
+          byte | ((value & mask) << shift)
+        }
+      end
+
     private
       def read_and_unpack(length, specifier)
         read(length).unpack(specifier)[0]