Dogcows Code - chaz/yoink/blob - src/stlplus/persistence/persistent_cstring.cpp

   1 ////////////////////////////////////////////////////////////////////////////////
   2
   3 //   Author:    Andy Rushton
   4 //   Copyright: (c) Southampton University 1999-2004
   5 //              (c) Andy Rushton           2004-2009
   6 //   License:   BSD License, see ../docs/license.html
   7
   8 ////////////////////////////////////////////////////////////////////////////////
   9
  10 #include "persistent_cstring.hpp"
  11 #include "persistent_int.hpp"
  12 #include <string.h>
  13
  14 ////////////////////////////////////////////////////////////////////////////////
  15 // Null-terminated char arrays
  16 // Format: address [ size data ]
  17
  18 void stlplus::dump_cstring(stlplus::dump_context& context, const char* data) throw(stlplus::persistent_dump_failed)
  19 {
  20   // register the address and get the magic key for it
  21   std::pair<bool,unsigned> mapping = context.pointer_map(data);
  22   stlplus::dump_unsigned(context,mapping.second);
  23   // if the address is null, then that is all that we need to do
  24   // however, if it is non-null and this is the first sight of the address, dump the contents
  25   if (data && !mapping.first)
  26   {
  27     unsigned size = strlen(data);
  28     stlplus::dump_unsigned(context,size);
  29     for (unsigned i = 0; i < size; i++)
  30       stlplus::dump_char(context,data[i]);
  31   }
  32 }
  33
  34 void stlplus::restore_cstring(restore_context& context, char*& data) throw(stlplus::persistent_restore_failed)
  35 {
  36   // destroy any previous contents
  37   if (data)
  38   {
  39     delete[] data;
  40     data = 0;
  41   }
  42   // get the magic key
  43   unsigned magic = 0;
  44   stlplus::restore_unsigned(context,magic);
  45   // now lookup the magic key to see if this pointer has already been restored
  46   // null pointers are always flagged as already restored
  47   std::pair<bool,void*> address = context.pointer_map(magic);
  48   if (!address.first)
  49   {
  50     // this pointer has never been seen before and is non-null
  51     // restore the string
  52     unsigned size = 0;
  53     stlplus::restore_unsigned(context,size);
  54     data = new char[size+1];
  55     for (unsigned i = 0; i < size; i++)
  56       stlplus::restore_char(context,data[i]);
  57     data[size] = '\0';
  58     // add this pointer to the set of already seen objects
  59     context.pointer_add(magic,data);
  60   }
  61 }
  62
  63 ////////////////////////////////////////////////////////////////////////////////