Place ethash cache in a more clearly shared folder.

libdevcrypto/FileSystem.cpp

@@ -32,12 +32,15 @@
 using namespace std;
 using namespace dev;
 
-std::string dev::getDataDir()
+std::string dev::getDataDir(std::string _prefix)
 {
+	if (_prefix.empty())
+		_prefix = "ethereum";
 #ifdef _WIN32
+	_prefix[0] = toupper(_prefix[0]);
 	char path[1024] = "";
 	if (SHGetSpecialFolderPathA(NULL, path, CSIDL_APPDATA, true))
-		return (boost::filesystem::path(path) / "Ethereum").string();
+		return (boost::filesystem::path(path) / _prefix).string();
 	else
 	{
 	#ifndef _MSC_VER // todo?
@@ -57,7 +60,7 @@ std::string dev::getDataDir()
 	// This eventually needs to be put in proper wrapper (to support sandboxing)
 	return (dataDirPath / "Library/Application Support/Ethereum").string();
 #else
-	return (dataDirPath / ".ethereum").string();
+	return (dataDirPath / ("." + _prefix)).string();
 #endif
 #endif
 }

libdevcrypto/FileSystem.h

@@ -30,6 +30,6 @@ namespace dev
 {
 
 /// @returns the path for user data.
-std::string getDataDir();
+std::string getDataDir(std::string _prefix = "ethereum");
 
 }

libethcore/Ethasher.cpp

@@ -71,10 +71,10 @@ bytesConstRef Ethasher::full(BlockInfo const& _header)
 			m_fulls.erase(m_fulls.begin());
 		}
 		try {
-			boost::filesystem::create_directories(getDataDir() + "/ethashcache");
+			boost::filesystem::create_directories(getDataDir("ethash"));
 		} catch (...) {}
 
-		std::string memoFile = getDataDir() + "/ethashcache/full";
+		std::string memoFile = getDataDir("ethash") + "/full";
 		auto info = rlpList(c_ethashRevision, _header.seedHash());
 		if (boost::filesystem::exists(memoFile) && contents(memoFile + ".info") != info)
 			boost::filesystem::remove(memoFile);