From f0510d2f90467de8e8f260b47d79a9baaf9bef17 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 17 Sep 2009 07:15:29 +0200
Subject: Start tracking XSD with git

---
 examples/cxx/tree/binary/xdr/driver.cxx | 149 ++++++++++++++++++++++++++++++++
 1 file changed, 149 insertions(+)
 create mode 100644 examples/cxx/tree/binary/xdr/driver.cxx

(limited to 'examples/cxx/tree/binary/xdr/driver.cxx')

diff --git a/examples/cxx/tree/binary/xdr/driver.cxx b/examples/cxx/tree/binary/xdr/driver.cxx
new file mode 100644
index 0000000..495eafc
--- /dev/null
+++ b/examples/cxx/tree/binary/xdr/driver.cxx
@@ -0,0 +1,149 @@
+// file      : examples/cxx/tree/binary/xdr/driver.cxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#include <memory>   // std::auto_ptr
+#include <cstring>  // std::memcpy
+#include <cstddef>  // std::size_t
+#include <iostream>
+
+#include <rpc/types.h>
+#include <rpc/xdr.h>
+
+#include "library.hxx"
+
+using std::cerr;
+using std::endl;
+using std::size_t;
+
+// XDR output functions. Their implementations are provided after main().
+//
+struct underflow_info
+{
+  xml_schema::buffer* buf;
+  size_t pos;
+};
+
+extern "C" int
+overflow (void* user_data, char* buf, int n);
+
+extern "C" int
+underflow (void* user_data, char* buf, int n);
+
+// The xdrrec_create function (used below) has slightly different
+// prototypes on different platforms. To make this example portable
+// we will need to cast the actual function to the following common
+// prototype.
+//
+extern "C"
+typedef  void (*xdrrec_create_p) (
+  XDR*,
+  unsigned int write_size,
+  unsigned int read_size,
+  void* user_data,
+  int (*read) (void* user_data, char* buf, int n),
+  int (*write) (void* user_data, char* buf, int n));
+
+int
+main (int argc, char* argv[])
+{
+  if (argc != 2)
+  {
+    cerr << "usage: " << argv[0] << " library.xml" << endl;
+    return 1;
+  }
+
+  try
+  {
+    using namespace library;
+
+    xdrrec_create_p xdrrec_create_ =
+      reinterpret_cast<xdrrec_create_p> (::xdrrec_create);
+
+    // Read in the file.
+    //
+    std::auto_ptr<catalog> c (catalog_ (argv[1]));
+
+    cerr << *c << endl;
+
+    // Save to an XDR stream.
+    //
+    XDR xdr;
+    xml_schema::buffer buf;
+
+    xdrrec_create_ (&xdr, 0, 0, reinterpret_cast<char*> (&buf), 0, &overflow);
+    xdr.x_op = XDR_ENCODE;
+
+    xml_schema::ostream<XDR> oxdr (xdr);
+
+    oxdr << *c;
+
+    xdrrec_endofrecord (&xdr, true); // Flush the data.
+    xdr_destroy (&xdr);
+
+    // The binary representation is now in the memory buffer 'buf'.
+    // To get to the raw data use buf.data() and buf.size().
+    //
+    cerr << endl
+         << "binary representation size: " << buf.size () << endl;
+
+    // Load from an XDR stream.
+    //
+    underflow_info ui;
+    ui.buf = &buf;
+    ui.pos = 0;
+
+    xdrrec_create_ (&xdr, 0, 0, reinterpret_cast<char*> (&ui), &underflow, 0);
+    xdr.x_op = XDR_DECODE;
+
+    xdrrec_skiprecord (&xdr);
+
+    xml_schema::istream<XDR> ixdr (xdr);
+
+    std::auto_ptr<catalog> copy (new catalog (ixdr));
+
+    xdr_destroy (&xdr);
+
+    cerr << *copy << endl;
+  }
+  catch (const xml_schema::exception& e)
+  {
+    cerr << e << endl;
+    return 1;
+  }
+}
+
+extern "C" int
+overflow (void* p, char* buf, int n_)
+{
+  xml_schema::buffer* dst (reinterpret_cast<xml_schema::buffer*> (p));
+  size_t n (static_cast<size_t> (n_));
+
+  size_t size (dst->size ());
+  size_t capacity (dst->capacity ());
+
+  // Implement exponential growth.
+  //
+  if (size + n > capacity && size + n < capacity * 2)
+    dst->capacity (capacity * 2);
+
+  dst->size (size + n);
+  std::memcpy (dst->data () + size, buf, n);
+
+  return n;
+}
+
+extern "C" int
+underflow (void* p, char* buf, int n_)
+{
+  underflow_info* ui (reinterpret_cast<underflow_info*> (p));
+  size_t n (static_cast<size_t> (n_));
+
+  size_t size (ui->buf->size () - ui->pos);
+  n = size > n ? n : size;
+
+  std::memcpy (buf, ui->buf->data () + ui->pos, n);
+  ui->pos += n;
+
+  return n;
+}
-- 
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