New example that shows how to embed schema grammar into application

1 files changed, 53 insertions, 0 deletions

diff --git a/examples/cxx/tree/embedded/grammar-input-stream.hxx b/examples/cxx/tree/embedded/grammar-input-stream.hxx
new file mode 100644
index 0000000..a1b73c6
--- /dev/null
+++ b/examples/cxx/tree/embedded/grammar-input-stream.hxx
@@ -0,0 +1,53 @@
+// file      : examples/cxx/tree/embedded/grammar-input-stream.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#ifndef GRAMMAR_INPUT_STREAM_HXX
+#define GRAMMAR_INPUT_STREAM_HXX
+
+#include <cstddef>
+#include <xercesc/util/BinInputStream.hpp>
+
+// Memory buffer input stream with the special-purpose schema
+// grammar decompression.
+//
+class grammar_input_stream: public xercesc::BinInputStream
+{
+public :
+  grammar_input_stream (const XMLByte* data, std::size_t size);
+
+#if _XERCES_VERSION >= 30000
+
+  virtual XMLFilePos
+  curPos () const;
+
+  virtual XMLSize_t
+  readBytes (XMLByte* const buf, const XMLSize_t size);
+
+  virtual const XMLCh*
+  getContentType () const;
+
+#else
+
+  virtual unsigned int
+  curPos () const;
+
+  virtual unsigned int
+  readBytes (XMLByte* const buf, const unsigned int size);
+
+#endif
+
+private :
+  const XMLByte* data_;
+  std::size_t size_;
+  std::size_t pos_;
+  std::size_t vpos_;
+
+  // Compression data.
+  //
+  size_t cseq_;   // Number of bytes left in a compression sequence.
+  bool alt_;      // Alternating or sequential sequence.
+  bool add_zero_; // Add a zero on the next read.
+};
+
+#endif // GRAMMAR_INPUT_STREAM_HXX