summaryrefslogtreecommitdiff
path: root/examples/cxx/tree/binary/xdr/driver.cxx
diff options
context:
space:
mode:
Diffstat (limited to 'examples/cxx/tree/binary/xdr/driver.cxx')
-rw-r--r--examples/cxx/tree/binary/xdr/driver.cxx149
1 files changed, 149 insertions, 0 deletions
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;
+}