--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/common/tag-buffer.cc	Thu Apr 24 16:06:33 2008 -0700
@@ -0,0 +1,160 @@
+#include "tag-buffer.h"
+#include "ns3/assert.h"
+
+namespace ns3 {
+
+void 
+TagBuffer::WriteU8 (uint8_t v)
+{
+  NS_ASSERT (m_current + 1 <= m_end);
+  *m_current = v;
+  m_current++;
+}
+void 
+TagBuffer::WriteU16 (uint16_t data)
+{
+  WriteU8 ((data >> 0) & 0xff);
+  WriteU8 ((data >> 8) & 0xff);
+}
+void 
+TagBuffer::WriteU32 (uint32_t data)
+{
+  WriteU8 ((data >> 0) & 0xff);
+  WriteU8 ((data >> 8) & 0xff);
+  WriteU8 ((data >> 16) & 0xff);
+  WriteU8 ((data >> 24) & 0xff);
+}
+void 
+TagBuffer::WriteU64 (uint64_t data)
+{
+  WriteU8 ((data >> 0) & 0xff);
+  WriteU8 ((data >> 8) & 0xff);
+  WriteU8 ((data >> 16) & 0xff);
+  WriteU8 ((data >> 24) & 0xff);
+  WriteU8 ((data >> 32) & 0xff);
+  WriteU8 ((data >> 40) & 0xff);
+  WriteU8 ((data >> 48) & 0xff);
+  WriteU8 ((data >> 54) & 0xff);
+}
+void
+TagBuffer::WriteDouble (double v)
+{
+  uint8_t *buf = (uint8_t *)&v;
+  for (uint32_t i = 0; i < sizeof (double); ++i, ++buf)
+    {
+      WriteU8 (*buf);
+    }
+}
+void 
+TagBuffer::Write (const uint8_t *buffer, uint32_t size)
+{
+  for (uint32_t i = 0; i < size; ++i, ++buffer)
+    {
+      WriteU8 (*buffer);
+    }
+}
+uint8_t  
+TagBuffer::ReadU8 (void)
+{
+  NS_ASSERT (m_current + 1 <= m_end);
+  uint8_t v;
+  v = *m_current;
+  m_current++;
+  return v;
+}
+uint16_t 
+TagBuffer::ReadU16 (void)
+{
+  uint8_t byte0 = ReadU8 ();
+  uint8_t byte1 = ReadU8 ();
+  uint16_t data = byte1;
+  data <<= 8;
+  data |= byte0;
+  return data;
+}
+uint32_t 
+TagBuffer::ReadU32 (void)
+{
+  uint8_t byte0 = ReadU8 ();
+  uint8_t byte1 = ReadU8 ();
+  uint8_t byte2 = ReadU8 ();
+  uint8_t byte3 = ReadU8 ();
+  uint32_t data = byte3;
+  data <<= 8;
+  data |= byte2;
+  data <<= 8;
+  data |= byte1;
+  data <<= 8;
+  data |= byte0;
+  return data;
+}
+uint64_t 
+TagBuffer::ReadU64 (void)
+{
+  uint8_t byte0 = ReadU8 ();
+  uint8_t byte1 = ReadU8 ();
+  uint8_t byte2 = ReadU8 ();
+  uint8_t byte3 = ReadU8 ();
+  uint8_t byte4 = ReadU8 ();
+  uint8_t byte5 = ReadU8 ();
+  uint8_t byte6 = ReadU8 ();
+  uint8_t byte7 = ReadU8 ();
+  uint32_t data = byte7;
+  data <<= 8;
+  data |= byte6;
+  data <<= 8;
+  data |= byte5;
+  data <<= 8;
+  data |= byte4;
+  data <<= 8;
+  data |= byte3;
+  data <<= 8;
+  data |= byte2;
+  data <<= 8;
+  data |= byte1;
+  data <<= 8;
+  data |= byte0;
+
+  return data;
+}
+double
+TagBuffer::ReadDouble (void)
+{
+  double v;
+  uint8_t *buf = (uint8_t *)&v;
+  for (uint32_t i = 0; i < sizeof (double); ++i, ++buf)
+    {
+      *buf = ReadU8 ();
+    }
+  return v;
+}
+void 
+TagBuffer::Read (uint8_t *buffer, uint32_t size)
+{
+  for (uint32_t i = 0; i < size; ++i, ++buffer)
+    {
+      *buffer = ReadU8 ();
+    }
+}
+TagBuffer::TagBuffer (uint8_t *start, uint8_t *end)
+  : m_current (start),
+    m_end (end)
+{}
+
+void 
+TagBuffer::TrimAtEnd (uint32_t trim)
+{
+  NS_ASSERT (m_current <= (m_end - trim));
+  m_end -= trim;
+}
+
+void 
+TagBuffer::CopyFrom (TagBuffer o)
+{
+  uint32_t size = o.m_end - o.m_current;
+  NS_ASSERT (size <= m_end - m_current);
+  memcpy (m_current, o.m_current, size);
+  m_current += size;
+}
+
+} // namespace ns3