X-Git-Url: https://git.dogcows.com/gitweb?a=blobdiff_plain;f=src%2Fstlplus%2Fpersistence%2Fpersistent_inf.cpp;fp=src%2Fstlplus%2Fpersistence%2Fpersistent_inf.cpp;h=29637c913ea05ccba4eba683b7aa6a9256cce7df;hb=6b0a0d0efafe34d48ab344fca3b479553bd4e62c;hp=0000000000000000000000000000000000000000;hpb=85783316365181491a3e3c0c63659972477cebba;p=chaz%2Fyoink

diff --git a/src/stlplus/persistence/persistent_inf.cpp b/src/stlplus/persistence/persistent_inf.cpp
new file mode 100644
index 0000000..29637c9
--- /dev/null
+++ b/src/stlplus/persistence/persistent_inf.cpp
@@ -0,0 +1,66 @@
+////////////////////////////////////////////////////////////////////////////////
+
+//   Author:    Andy Rushton
+//   Copyright: (c) Southampton University 1999-2004
+//              (c) Andy Rushton           2004-2009
+//   License:   BSD License, see ../docs/license.html
+
+////////////////////////////////////////////////////////////////////////////////
+
+// can be excluded to break the dependency on the portability library
+#ifndef NO_STLPLUS_INF
+
+#include "persistent_int.hpp"
+#include "persistent_string.hpp"
+#include "persistent_inf.hpp"
+
+////////////////////////////////////////////////////////////////////////////////
+
+void stlplus::dump_inf(stlplus::dump_context& context, const stlplus::inf& data)
+  throw(stlplus::persistent_dump_failed)
+{
+  // don't support dumping of old versions
+  if (context.version() < 2)
+    throw stlplus::persistent_dump_failed(std::string("stlplus::inf::dump: wrong version"));
+  // just dump the string
+  stlplus::dump_string(context,data.get_bytes());
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+void stlplus::restore_inf(stlplus::restore_context& context, stlplus::inf& data)
+  throw(stlplus::persistent_restore_failed)
+{
+  if (context.version() < 1)
+    throw stlplus::persistent_restore_failed(std::string("stlplus::inf::restore: wrong version"));
+  if (context.version() == 1)
+  {
+    // old-style restore relies on the word size being the same - 32-bits - on all platforms
+    // this can be restored on such machines but is not portable to 64-bit machines
+    std::string value;
+    unsigned bits = 0;
+    stlplus::restore_unsigned(context,bits);
+    unsigned words = (bits+7)/32;
+    // inf was dumped msB first
+    for (unsigned i = words; i--; )
+    {
+      // restore a word
+      unsigned word = 0;
+      stlplus::restore_unsigned(context,word);
+      // now extract the bytes
+      unsigned char* byte_ptr = (unsigned char*)(&word);
+      for (unsigned b = 4; b--; )
+        value.insert(value.begin(),byte_ptr[context.little_endian() ? b : 3 - b]);
+    }
+    data.set_bytes(value);
+  }
+  else
+  {
+    // new-style dump just uses the string persistence
+    std::string value;
+    stlplus::restore_string(context,value);
+    data.set_bytes(value);
+  }
+}
+////////////////////////////////////////////////////////////////////////////////
+#endif