Add read flags: include info, include data, objects only

[foxtacles]

This adds flags to the Read functions, in order to allow parsing meta information from a SI file:

• IncludeData: reads data of objects
• IncludeInfo: writes to the info object
• ObjectsOnly: reads objects only, excludes everything else

Reading ISLE.SI

• with IncludeData + IncludeInfo (default): 314MB
• with IncludeInfo: 17MB
• with ObjectsOnly: 5.6MB
  (3.2MB was the test program itself in memory)

Close #34

[madebr]

Forwarding the thorough review to @itsmattkc

[madebr]

@foxtacles
Is this patch correct for isle-portable to work with this branch?

--- a/extensions/src/siloader.cpp
+++ b/extensions/src/siloader.cpp
@@ -242,10 +242,10 @@ bool SiLoader::LoadFile(const char* p_file)
 
        MxString path = MxString(MxOmni::GetHD()) + p_file;
        path.MapPathToFilesystem();
-       if (si.Read(path.GetData(), si::Interleaf::ObjectsOnly | si::Interleaf::NoInfo) != si::Interleaf::ERROR_SUCCESS) {
+       if (si.Read(path.GetData(), si::Interleaf::ObjectsOnly) != si::Interleaf::ERROR_SUCCESS) {
                path = MxString(MxOmni::GetCD()) + p_file;
                path.MapPathToFilesystem();
-               if (si.Read(path.GetData(), si::Interleaf::ObjectsOnly | si::Interleaf::NoInfo) !=
+               if (si.Read(path.GetData(), si::Interleaf::ObjectsOnly) !=
                        si::Interleaf::ERROR_SUCCESS) {
                        SDL_Log("Could not parse SI file %s", p_file);
                        return false;

[foxtacles]

@foxtacles Is this patch correct for isle-portable to work with this branch?

--- a/extensions/src/siloader.cpp
+++ b/extensions/src/siloader.cpp
@@ -242,10 +242,10 @@ bool SiLoader::LoadFile(const char* p_file)
 
        MxString path = MxString(MxOmni::GetHD()) + p_file;
        path.MapPathToFilesystem();
-       if (si.Read(path.GetData(), si::Interleaf::ObjectsOnly | si::Interleaf::NoInfo) != si::Interleaf::ERROR_SUCCESS) {
+       if (si.Read(path.GetData(), si::Interleaf::ObjectsOnly) != si::Interleaf::ERROR_SUCCESS) {
                path = MxString(MxOmni::GetCD()) + p_file;
                path.MapPathToFilesystem();
-               if (si.Read(path.GetData(), si::Interleaf::ObjectsOnly | si::Interleaf::NoInfo) !=
+               if (si.Read(path.GetData(), si::Interleaf::ObjectsOnly) !=
                        si::Interleaf::ERROR_SUCCESS) {
                        SDL_Log("Could not parse SI file %s", p_file);
                        return false;

Yep!

[madebr]

This needs a rebase on top of current master for isle-portable :)