model: Returning back support for CCNb wire format
Refs #1008 (http://redmine.named-data.net/)
diff --git a/model/wire/ccnb/wire-ccnb.cc b/model/wire/ccnb/wire-ccnb.cc
new file mode 100644
index 0000000..4f4f695
--- /dev/null
+++ b/model/wire/ccnb/wire-ccnb.cc
@@ -0,0 +1,213 @@
+/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2011 University of California, Los Angeles
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Author: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#include "wire-ccnb.h"
+
+#include <sstream>
+#include <boost/foreach.hpp>
+#include "ccnb-parser/common.h"
+
+NDN_NAMESPACE_BEGIN
+
+namespace wire {
+
+//////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////
+
+#define CCN_TT_BITS 3
+#define CCN_TT_MASK ((1 << CCN_TT_BITS) - 1)
+#define CCN_MAX_TINY ((1 << (7-CCN_TT_BITS)) - 1)
+#define CCN_TT_HBIT ((unsigned char)(1 << 7))
+
+size_t
+Ccnb::AppendBlockHeader (Buffer::Iterator &start, size_t val, uint32_t tt)
+{
+ unsigned char buf[1+8*((sizeof(val)+6)/7)];
+ unsigned char *p = &(buf[sizeof(buf)-1]);
+ size_t n = 1;
+ p[0] = (CCN_TT_HBIT & ~CcnbParser::CCN_CLOSE) |
+ ((val & CCN_MAX_TINY) << CCN_TT_BITS) |
+ (CCN_TT_MASK & tt);
+ val >>= (7-CCN_TT_BITS);
+ while (val != 0) {
+ (--p)[0] = (((unsigned char)val) & ~CCN_TT_HBIT) | CcnbParser::CCN_CLOSE;
+ n++;
+ val >>= 7;
+ }
+ start.Write (p,n);
+ return n;
+}
+
+size_t
+Ccnb::EstimateBlockHeader (size_t value)
+{
+ value >>= (7-CCN_TT_BITS);
+ size_t n = 1;
+ while (value>0)
+ {
+ value >>= 7;
+ n++;
+ }
+ return n;
+}
+
+size_t
+Ccnb::AppendNumber (Buffer::Iterator &start, uint32_t number)
+{
+ std::ostringstream os;
+ os << number;
+
+ size_t written = 0;
+ written += AppendBlockHeader (start, os.str().size(), CcnbParser::CCN_UDATA);
+ written += os.str().size();
+ start.Write (reinterpret_cast<const unsigned char*>(os.str().c_str()), os.str().size());
+
+ return written;
+}
+
+size_t
+Ccnb::EstimateNumber (uint32_t number)
+{
+ std::ostringstream os;
+ os << number;
+ return EstimateBlockHeader (os.str ().size ()) + os.str ().size ();
+}
+
+size_t
+Ccnb::AppendCloser (Buffer::Iterator &start)
+{
+ start.WriteU8 (CcnbParser::CCN_CLOSE);
+ return 1;
+}
+
+size_t
+Ccnb::AppendName (Buffer::Iterator &start, const Name &name)
+{
+ size_t written = 0;
+ BOOST_FOREACH (const std::string &component, name.GetComponents())
+ {
+ written += AppendTaggedBlob (start, CcnbParser::CCN_DTAG_Component,
+ reinterpret_cast<const uint8_t*>(component.c_str()), component.size());
+ }
+ return written;
+}
+
+size_t
+Ccnb::EstimateName (const Name &name)
+{
+ size_t written = 0;
+ BOOST_FOREACH (const std::string &component, name.GetComponents())
+ {
+ written += EstimateTaggedBlob (CcnbParser::CCN_DTAG_Component, component.size());
+ }
+ return written;
+}
+
+size_t
+Ccnb::AppendTimestampBlob (Buffer::Iterator &start, const Time &time)
+{
+ // the original function implements Markers... thought not sure what are these markers for...
+
+ // Determine miminal number of bytes required to store the timestamp
+ int required_bytes = 2; // 12 bits for fractions of a second, 4 bits left for seconds. Sometimes it is enough
+ intmax_t ts = time.ToInteger (Time::S) >> 4;
+ for (; required_bytes < 7 && ts != 0; ts >>= 8) // not more than 6 bytes?
+ required_bytes++;
+
+ size_t len = AppendBlockHeader(start, required_bytes, CcnbParser::CCN_BLOB);
+
+ // write part with seconds
+ ts = time.ToInteger (Time::S) >> 4;
+ for (int i = 0; i < required_bytes - 2; i++)
+ start.WriteU8 ( ts >> (8 * (required_bytes - 3 - i)) );
+
+ /* arithmetic contortions are to avoid overflowing 31 bits */
+ ts = ((time.ToInteger (Time::S) & 15) << 12) +
+ (((time.ToInteger (Time::NS) % 1000000000) / 5 * 8 + 195312) / 390625);
+ for (int i = required_bytes - 2; i < required_bytes; i++)
+ start.WriteU8 ( ts >> (8 * (required_bytes - 1 - i)) );
+
+ return len + required_bytes;
+}
+
+size_t
+Ccnb::EstimateTimestampBlob (const Time &time)
+{
+ int required_bytes = 2; // 12 bits for fractions of a second, 4 bits left for seconds. Sometimes it is enough
+ intmax_t ts = time.ToInteger (Time::S) >> 4;
+ for (; required_bytes < 7 && ts != 0; ts >>= 8) // not more than 6 bytes?
+ required_bytes++;
+
+ return EstimateBlockHeader (required_bytes) + required_bytes;
+}
+
+size_t
+Ccnb::AppendTaggedBlob (Buffer::Iterator &start, uint32_t dtag,
+ const uint8_t *data, size_t size)
+{
+ size_t written = AppendBlockHeader (start, dtag, CcnbParser::CCN_DTAG);
+ /* 2 */
+ if (size>0)
+ {
+ written += AppendBlockHeader (start, size, CcnbParser::CCN_BLOB);
+ start.Write (data, size);
+ written += size;
+ /* size */
+ }
+ written += AppendCloser (start);
+ /* 1 */
+
+ return written;
+}
+
+size_t
+Ccnb::EstimateTaggedBlob (uint32_t dtag, size_t size)
+{
+ if (size>0)
+ return EstimateBlockHeader (dtag) + EstimateBlockHeader (size) + size + 1;
+ else
+ return EstimateBlockHeader (dtag) + 1;
+}
+
+size_t
+Ccnb::AppendString (Buffer::Iterator &start, uint32_t dtag,
+ const std::string &string)
+{
+ size_t written = AppendBlockHeader (start, dtag, CcnbParser::CCN_DTAG);
+ {
+ written += AppendBlockHeader (start, string.size (), CcnbParser::CCN_UDATA);
+ start.Write (reinterpret_cast<const uint8_t*> (string.c_str ()), string.size ());
+ written += string.size ();
+ }
+ written += AppendCloser (start);
+
+ return written;
+}
+
+size_t
+Ccnb::EstimateString (uint32_t dtag, const std::string &string)
+{
+ return EstimateBlockHeader (dtag) + EstimateBlockHeader (string.size ()) + string.size () + 1;
+}
+
+} // wire
+
+NDN_NAMESPACE_END