From 741f84835e207e219eb3093eaad845c941ba2818 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 25 Nov 2009 17:15:57 +0200
Subject: New example that shows how to embed schema grammar into application

---
 .../cxx/tree/embedded/grammar-input-stream.cxx     | 115 +++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 examples/cxx/tree/embedded/grammar-input-stream.cxx

(limited to 'examples/cxx/tree/embedded/grammar-input-stream.cxx')

diff --git a/examples/cxx/tree/embedded/grammar-input-stream.cxx b/examples/cxx/tree/embedded/grammar-input-stream.cxx
new file mode 100644
index 0000000..0c94ea6
--- /dev/null
+++ b/examples/cxx/tree/embedded/grammar-input-stream.cxx
@@ -0,0 +1,115 @@
+// file      : examples/cxx/tree/embedded/grammar-input-stream.cxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#include <cassert>
+#include "grammar-input-stream.hxx"
+
+grammar_input_stream::
+grammar_input_stream (const XMLByte* data, std::size_t size)
+      : data_ (data),
+        size_ (size),
+        pos_ (0),
+        vpos_ (0),
+        cseq_ (0),
+        add_zero_ (false)
+{
+}
+
+#if _XERCES_VERSION >= 30000
+XMLFilePos grammar_input_stream::
+curPos () const
+{
+  return static_cast<XMLFilePos> (vpos_);
+}
+#else
+unsigned int grammar_input_stream::
+curPos () const
+{
+  return static_cast<unsigned int> (vpos_);
+}
+#endif
+
+#if _XERCES_VERSION >= 30000
+XMLSize_t grammar_input_stream::
+readBytes (XMLByte* const buf, const XMLSize_t size)
+#else
+unsigned int grammar_input_stream::
+readBytes (XMLByte* const buf, const unsigned int size)
+#endif
+{
+  std::size_t i (0);
+
+  // Add a zero from the alternating sequence if it didn't
+  // fit on the previous read.
+  //
+  if (add_zero_)
+  {
+    buf[i++] = 0;
+    add_zero_ = false;
+  }
+
+  // If have an unfinished sequential sequence, output it now.
+  //
+  if (cseq_ != 0 && !alt_)
+  {
+    for (; cseq_ != 0 && i < size; --cseq_)
+      buf[i++] = 0;
+  }
+
+  for (; i < size && pos_ < size_;)
+  {
+    XMLByte b = buf[i++] = data_[pos_++];
+
+    // See if we are in a compression sequence.
+    //
+    if (cseq_ != 0)
+    {
+      if (i < size)
+        buf[i++] = 0;
+      else
+        add_zero_ = true; // Add it on the next read.
+
+      cseq_--;
+      continue;
+    }
+
+    // If we are not in a compression sequence and this byte is
+    // not zero then we are done.
+    //
+    if (b != 0)
+      continue;
+
+    // We have a zero.
+    //
+    assert (pos_ < size_); // There has to be another byte.
+    unsigned char v (static_cast<unsigned char> (data_[pos_++]));
+    alt_ = (v & 128) != 0;
+    cseq_ = v & 127;
+
+    // If it is a sequential sequence, output as many zeros as
+    // we can.
+    //
+    if (!alt_)
+    {
+      for (; cseq_ != 0 && i < size; --cseq_)
+        buf[i++] = 0;
+    }
+  }
+
+  vpos_ += i;
+
+#if _XERCES_VERSION >= 30000
+  return static_cast<XMLSize_t> (i);
+#else
+  return static_cast<unsigned int> (i);
+#endif
+}
+
+#if _XERCES_VERSION >= 30000
+const XMLCh* grammar_input_stream::
+getContentType () const
+{
+  return 0;
+}
+#endif
-- 
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