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data.cpp
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data.cpp
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// K-3D
// Copyright (c) 1995-2005, Timothy M. Shead
//
// Contact: [email protected]
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public
// License along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#include <k3dsdk/base64.h>
#include <k3dsdk/data.h>
#include <k3dsdk/fstream.h>
#include <k3dsdk/path.h>
#include <k3dsdk/share.h>
#include <k3dsdk/system.h>
namespace k3d
{
std::ostream& operator<<(std::ostream& Stream, const ipath_property::reference_t& RHS)
{
switch(RHS)
{
case ipath_property::ABSOLUTE_REFERENCE:
Stream << "absolute";
break;
case ipath_property::RELATIVE_REFERENCE:
Stream << "relative";
break;
case ipath_property::INLINE_REFERENCE:
Stream << "inline";
break;
}
return Stream;
}
std::istream& operator>>(std::istream& Stream, ipath_property::reference_t& RHS)
{
std::string temp;
Stream >> temp;
if(temp == "absolute")
RHS = ipath_property::ABSOLUTE_REFERENCE;
else if(temp == "relative")
RHS = ipath_property::RELATIVE_REFERENCE;
else if(temp == "inline")
RHS = ipath_property::INLINE_REFERENCE;
else
{
log() << error << "unknown enumeration" << std::endl;
RHS = ipath_property::RELATIVE_REFERENCE;
}
return Stream;
}
namespace data
{
iproperty* property_lookup(iproperty* const Source)
{
iproperty* result = Source;
// We lookup property dependencies using two pointers so we can detect cycles ...
iproperty* slow = Source ? Source->property_dependency() : 0;
iproperty* fast = slow ? slow->property_dependency() : 0;
while(slow)
{
if(slow == fast)
return Source;
result = slow;
slow = slow->property_dependency();
fast = fast ? fast->property_dependency() : 0;
fast = fast ? fast->property_dependency() : 0;
}
return result;
}
xml::element& save_external_resource(xml::element& Element, const ipersistent::save_context& Context, const std::string& Name, const ipath_property::reference_t Reference, const filesystem::path& Value)
{
xml::element& xml_storage = Element.append(
xml::element("property",
xml::attribute("name", Name)));
// Construct absolute and relative paths for later reference
const filesystem::path absolute_path = filesystem::path(Value.is_complete() ? Value : Context.root_path / Value);
// Under certain circumstances, we override the user's choice of reference ...
// As a special-case, if the value doesn't have the same root name as the reference
// (i.e. different drive letters on Win32), force an absolute path ...
ipath_property::reference_t reference = Reference;
if(reference == ipath_property::RELATIVE_REFERENCE)
{
if(Value.is_complete() && Value.root_name() != Context.root_path.root_name())
reference = ipath_property::ABSOLUTE_REFERENCE;
}
// As a special-case, an absolute path that points into the share directory
// becomes a relative path ...
if(reference == ipath_property::ABSOLUTE_REFERENCE)
{
if(0 == absolute_path.generic_utf8_string().find(share_path().generic_utf8_string()))
reference = ipath_property::RELATIVE_REFERENCE;
}
// Actually store the data ...
switch(reference)
{
case ipath_property::ABSOLUTE_REFERENCE:
{
xml_storage.append(xml::attribute("reference", string_cast(ipath_property::ABSOLUTE_REFERENCE)));
xml_storage.append(xml::attribute("absolute_path", absolute_path.generic_utf8_string().raw()));
break;
}
case ipath_property::RELATIVE_REFERENCE:
{
// As a special-case, a path that points into the share directory
// will be stored relative to share, instead of relative to the document
if(0 == absolute_path.generic_utf8_string().find(share_path().generic_utf8_string()))
{
const filesystem::path relative_path = filesystem::make_relative_path(absolute_path, share_path());
xml_storage.append(xml::attribute("reference", string_cast(ipath_property::RELATIVE_REFERENCE)));
xml_storage.append(xml::attribute("relative_path", relative_path.generic_utf8_string().raw()));
xml_storage.append(xml::element("root", "$K3D_SHARE_PATH"));
}
else
{
const filesystem::path relative_path = filesystem::make_relative_path(absolute_path, Context.root_path);
xml_storage.append(xml::attribute("reference", string_cast(ipath_property::RELATIVE_REFERENCE)));
xml_storage.append(xml::attribute("relative_path", relative_path.generic_utf8_string().raw()));
}
break;
}
case ipath_property::INLINE_REFERENCE:
{
xml_storage.append(xml::attribute("reference", string_cast(ipath_property::INLINE_REFERENCE)));
xml_storage.append(xml::attribute("filename", absolute_path.leaf().raw()));
xml_storage.append(xml::attribute("encoding", "base64"));
filesystem::ifstream file(absolute_path);
std::stringstream buffer;
base64::encode(file, buffer);
xml_storage.text = "\n" buffer.str();
break;
}
}
return xml_storage;
}
void load_external_resource(xml::element& Element, const ipersistent::load_context& Context, ipath_property::reference_t& Reference, filesystem::path& Value)
{
Reference = xml::attribute_value<ipath_property::reference_t>(Element, "reference", ipath_property::RELATIVE_REFERENCE);
switch(Reference)
{
case ipath_property::ABSOLUTE_REFERENCE:
{
try
{
/** \todo Change this to use generic_path after version 0.8 */
Value = filesystem::native_path(ustring::from_utf8(xml::attribute_text(Element, "absolute_path")));
log() << info << "Resolved absolute path " << Value.native_console_string() << std::endl;
}
catch(std::exception& e)
{
log() << error << e.what() << std::endl;
}
break;
}
case ipath_property::RELATIVE_REFERENCE:
{
try
{
filesystem::path root_path = Context.root_path;
if(xml::element* const xml_root = xml::find_element(Element, "root"))
{
if(xml_root->text == "$K3D_SHARE_PATH")
root_path = share_path();
else
root_path = filesystem::generic_path(xml_root->text);
}
Value = root_path / filesystem::generic_path(xml::attribute_text(Element, "relative_path"));
log() << info << "Resolved relative path as " << Value.native_console_string() << std::endl;
}
catch(std::exception& e)
{
log() << error << e.what() << std::endl;
}
break;
}
case ipath_property::INLINE_REFERENCE:
{
try
{
Value = system::get_temp_directory() / filesystem::generic_path(xml::attribute_text(Element, "filename"));
filesystem::ofstream file(Value);
std::stringstream buffer(Element.text);
base64::decode(buffer, file);
log() << info << "Extracted inline document to " << Value.native_console_string() << std::endl;
}
catch(std::exception& e)
{
log() << error << e.what() << std::endl;
}
break;
}
}
}
} // namespace data
} // namespace k3d