/** Loads a cmap and returns the corresponding object. */
CMap* CMapManager::lookup (const string &name) {
CMaps::iterator it = _cmaps.find(name);
if (it != _cmaps.end())
return it->second;
if (_includedCMaps.find(name) != _includedCMaps.end()) {
_level = 0;
ostringstream oss;
oss << "circular reference of CMap " << name;
throw CMapReaderException(oss.str());
}
CMap *cmap=0;
if (name == "Identity-H")
cmap = new IdentityHCMap;
else if (name == "Identity-V")
cmap = new IdentityVCMap;
else if (name == "unicode")
cmap = new UnicodeCMap;
if (cmap) {
_cmaps[name] = cmap;
return cmap;
}
// Load cmap data of file <name> and also process all cmaps referenced by operator "usecmap".
// This can lead to a sequence of further calls of lookup(). In order to prevent infinite loops
// due to (disallowed) circular cmap inclusions, we keep track of all cmaps processed during
// a sequence of inclusions.
_includedCMaps.insert(name); // save name of current cmap being processed
_level++; // increase nesting level
try {
CMapReader reader;
if (!(cmap = reader.read(name))) {
_level = 1;
Message::wstream(true) << "CMap file '" << name << "' not found\n";
}
_cmaps[name] = cmap;
}
catch (const CMapReaderException &e) {
Message::estream(true) << "CMap file " << name << ": " << e.what() << "\n";
}
if (--_level == 0) // back again at initial nesting level?
_includedCMaps.clear(); // => names of included cmaps are no longer needed
return cmap;
}
CMapReaderTest () {
istringstream iss(cmapsrc);
CMapReader reader;
cmap = reader.read(iss, "Test-Map");
}