LoadFile() fails on empty file with Unicode, UTF-8

[leokoppel]

Ran into this when trying a simple "will this compile and run?" without anything in the ini file. SI_CONVERT_WIN32 is set.

const PWSTR filename= L"empty.ini";

CSimpleIniW ini(true, false, false);

// Write empty file
SI_Error retval = ini.SaveFile(filename);
assert(retval == SI_OK);

// Attempt to load empty file - fails
retval = ini.LoadFile(filename);
assert(retval == SI_FAIL);

The problem seems to be in the Windows version of SizeFromStore for that combination of flags. It calls MultiByteToWideChar with a cbMultiByte of 0, which fails.

I'll see if there's a safe simple fix but I'm not familiar with these character set functions. Otherwise, this may at least help someone else who runs into the issue.

[brofield]

Thanks for your patch.