Include mod path in the cache path.

This was SVN commit r13546.

source/lib/path.h

@@ -1,4 +1,4 @@
-/* Copyright (c) 2010 Wildfire Games
+/* Copyright (c) 2013 Wildfire Games
  *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files (the
@@ -205,6 +205,28 @@ public:
 		return ret;
 	}
 
+	/**
+	 * Return the path before the common part of both paths
+	 * @param other Indicates the start of the path which should be removed
+	 * @note other should be a VfsPath, while this should be an OsPath
+	 */
+	Path BeforeCommon(Path other) const
+	{
+		Path ret = *this;
+		if(ret.empty() || other.empty())
+			return L"";
+
+		// Convert the separator to allow for string comparison
+		if(other.separator != ret.separator)
+			replace(other.path.begin(), other.path.end(), other.separator, ret.separator);
+
+		const size_t idx = ret.path.rfind(other.path);
+		if(idx == String::npos)
+			return L"";
+
+		return path.substr(0, idx);
+	}
+
 	static Status Validate(String::value_type c);
 
 private:

source/ps/CacheLoader.cpp

@@ -1,4 +1,4 @@
-/* Copyright (C) 2012 Wildfire Games.
+/* Copyright (C) 2013 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -143,8 +143,10 @@ VfsPath CCacheLoader::LooseCachePath(const VfsPath& sourcePath, const MD5& initi
 	for (size_t i = 0; i < 8; ++i)
 		digestPrefix << std::setfill(L'0') << std::setw(2) << (int)digest[i];
 
-	// Construct the final path
-	return VfsPath("cache") / sourcePath.ChangeExtension(sourcePath.Extension().string() + L"." + digestPrefix.str() + m_FileExtension);
+	// Get the mod path
+	OsPath path;
+	m_VFS->GetRealPath(sourcePath, path);
 
-	// TODO: we should probably include the mod name, once that's possible (http://trac.wildfiregames.com/ticket/564)
+	// Construct the final path
+	return VfsPath("cache") / path_name_only(path.BeforeCommon(sourcePath).Parent().string().c_str()) / sourcePath.ChangeExtension(sourcePath.Extension().string() + L"." + digestPrefix.str() + m_FileExtension);
 }