First part of change to remove LLVFS from the Viewer. Consists of code changes to remove LLVFS and LLVFSThread classes along with the associated source files. The existing llvfs folder is renamed to llcache. Also includes changes to CMake script in many places to reflect changes. Eventually, llvfile source file and class will be renamed but that is not in this change.

1 files changed, 1134 insertions, 0 deletions

diff --git a/indra/llcache/lldir.cpp b/indra/llcache/lldir.cpp
new file mode 100644
index 0000000000..10fbc06c61
--- /dev/null
+++ b/indra/llcache/lldir.cpp
@@ -0,0 +1,1134 @@
+/** 
+ * @file lldir.cpp
+ * @brief implementation of directory utilities base class
+ *
+ * $LicenseInfo:firstyear=2002&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library 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
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#include "linden_common.h"
+
+#if !LL_WINDOWS
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <errno.h>
+#else
+#include <direct.h>
+#endif
+
+#include "lldir.h"
+
+#include "llerror.h"
+#include "lltimer.h"	// ms_sleep()
+#include "lluuid.h"
+
+#include "lldiriterator.h"
+#include "stringize.h"
+#include "llstring.h"
+#include <boost/filesystem.hpp>
+#include <boost/foreach.hpp>
+#include <boost/range/begin.hpp>
+#include <boost/range/end.hpp>
+#include <boost/assign/list_of.hpp>
+#include <boost/bind.hpp>
+#include <boost/ref.hpp>
+#include <algorithm>
+
+using boost::assign::list_of;
+using boost::assign::map_list_of;
+
+#if LL_WINDOWS
+#include "lldir_win32.h"
+LLDir_Win32 gDirUtil;
+#elif LL_DARWIN
+#include "lldir_mac.h"
+LLDir_Mac gDirUtil;
+#elif LL_SOLARIS
+#include "lldir_solaris.h"
+LLDir_Solaris gDirUtil;
+#else
+#include "lldir_linux.h"
+LLDir_Linux gDirUtil;
+#endif
+
+LLDir *gDirUtilp = (LLDir *)&gDirUtil;
+
+/// Values for findSkinnedFilenames(subdir) parameter
+const char
+	*LLDir::XUI      = "xui",
+	*LLDir::TEXTURES = "textures",
+	*LLDir::SKINBASE = "";
+
+static const char* const empty = "";
+std::string LLDir::sDumpDir = "";
+
+LLDir::LLDir()
+:	mAppName(""),
+	mExecutablePathAndName(""),
+	mExecutableFilename(""),
+	mExecutableDir(""),
+	mAppRODataDir(""),
+	mOSUserDir(""),
+	mOSUserAppDir(""),
+	mLindenUserDir(""),
+	mOSCacheDir(""),
+	mCAFile(""),
+	mTempDir(""),
+	mDirDelimiter("/"), // fallback to forward slash if not overridden
+	mLanguage("en"),
+	mUserName("undefined")
+{
+}
+
+LLDir::~LLDir()
+{
+}
+
+std::vector<std::string> LLDir::getFilesInDir(const std::string &dirname)
+{
+    //Returns a vector of fullpath filenames.
+
+#ifdef LL_WINDOWS // or BOOST_WINDOWS_API
+    boost::filesystem::path p(utf8str_to_utf16str(dirname));
+#else
+    boost::filesystem::path p(dirname);
+#endif
+
+    std::vector<std::string> v;
+    
+    if (exists(p))
+    {
+        if (is_directory(p))
+        {
+            boost::filesystem::directory_iterator end_iter;
+            for (boost::filesystem::directory_iterator dir_itr(p);
+                 dir_itr != end_iter;
+                 ++dir_itr)
+            {
+                if (boost::filesystem::is_regular_file(dir_itr->status()))
+                {
+                    v.push_back(dir_itr->path().filename().string());
+                }
+            }
+        }
+    }
+    return v;
+}   
+            
+S32 LLDir::deleteFilesInDir(const std::string &dirname, const std::string &mask)
+{
+	S32 count = 0;
+	std::string filename; 
+	std::string fullpath;
+	S32 result;
+
+	// File masks starting with "/" will match nothing, so we consider them invalid.
+	if (LLStringUtil::startsWith(mask, getDirDelimiter()))
+	{
+		LL_WARNS() << "Invalid file mask: " << mask << LL_ENDL;
+		llassert(!"Invalid file mask");
+	}
+
+	LLDirIterator iter(dirname, mask);
+	while (iter.next(filename))
+	{
+		fullpath = add(dirname, filename);
+
+		if(LLFile::isdir(fullpath))
+		{
+			// skipping directory traversal filenames
+			count++;
+			continue;
+		}
+
+		S32 retry_count = 0;
+		while (retry_count < 5)
+		{
+			if (0 != LLFile::remove(fullpath))
+			{
+				retry_count++;
+				result = errno;
+				LL_WARNS() << "Problem removing " << fullpath << " - errorcode: "
+						<< result << " attempt " << retry_count << LL_ENDL;
+
+				if(retry_count >= 5)
+				{
+					LL_WARNS() << "Failed to remove " << fullpath << LL_ENDL ;
+					return count ;
+				}
+
+				ms_sleep(100);
+			}
+			else
+			{
+				if (retry_count)
+				{
+					LL_WARNS() << "Successfully removed " << fullpath << LL_ENDL;
+				}
+				break;
+			}			
+		}
+		count++;
+	}
+	return count;
+}
+
+U32 LLDir::deleteDirAndContents(const std::string& dir_name)
+{
+    //Removes the directory and its contents.  Returns number of files deleted.
+	
+	U32 num_deleted = 0;
+
+	try
+	{
+#ifdef LL_WINDOWS // or BOOST_WINDOWS_API
+		boost::filesystem::path dir_path(utf8str_to_utf16str(dir_name));
+#else
+		boost::filesystem::path dir_path(dir_name);
+#endif
+
+	   if (boost::filesystem::exists (dir_path))
+	   {
+	      if (!boost::filesystem::is_empty (dir_path))
+		  {   // Directory has content
+		     num_deleted = boost::filesystem::remove_all (dir_path);
+		  }
+		  else
+		  {   // Directory is empty
+		     boost::filesystem::remove (dir_path);
+		  }
+	   }
+	}
+	catch (boost::filesystem::filesystem_error &er)
+	{ 
+		LL_WARNS() << "Failed to delete " << dir_name << " with error " << er.code().message() << LL_ENDL;
+	} 
+	return num_deleted;
+}
+
+const std::string LLDir::findFile(const std::string &filename, 
+						   const std::string& searchPath1, 
+						   const std::string& searchPath2, 
+						   const std::string& searchPath3) const
+{
+	std::vector<std::string> search_paths;
+	search_paths.push_back(searchPath1);
+	search_paths.push_back(searchPath2);
+	search_paths.push_back(searchPath3);
+	return findFile(filename, search_paths);
+}
+
+const std::string LLDir::findFile(const std::string& filename, const std::vector<std::string> search_paths) const
+{
+	std::vector<std::string>::const_iterator search_path_iter;
+	for (search_path_iter = search_paths.begin();
+		search_path_iter != search_paths.end();
+		++search_path_iter)
+	{
+		if (!search_path_iter->empty())
+		{
+			std::string filename_and_path = (*search_path_iter);
+			if (!filename.empty())
+			{
+				filename_and_path += getDirDelimiter() + filename;
+			}
+			if (fileExists(filename_and_path))
+			{
+				return filename_and_path;
+			}
+		}
+	}
+	return "";
+}
+
+
+const std::string &LLDir::getExecutablePathAndName() const
+{
+	return mExecutablePathAndName;
+}
+
+const std::string &LLDir::getExecutableFilename() const
+{
+	return mExecutableFilename;
+}
+
+const std::string &LLDir::getExecutableDir() const
+{
+	return mExecutableDir;
+}
+
+const std::string &LLDir::getWorkingDir() const
+{
+	return mWorkingDir;
+}
+
+const std::string &LLDir::getAppName() const
+{
+	return mAppName;
+}
+
+const std::string &LLDir::getAppRODataDir() const
+{
+	return mAppRODataDir;
+}
+
+const std::string &LLDir::getOSUserDir() const
+{
+	return mOSUserDir;
+}
+
+const std::string &LLDir::getOSUserAppDir() const
+{
+	return mOSUserAppDir;
+}
+
+const std::string &LLDir::getLindenUserDir() const
+{
+	if (mLindenUserDir.empty())
+	{
+		LL_DEBUGS() << "getLindenUserDir() called early, we don't have the user name yet - returning empty string to caller" << LL_ENDL;
+	}
+
+	return mLindenUserDir;
+}
+
+const std::string& LLDir::getChatLogsDir() const
+{
+	return mChatLogsDir;
+}
+
+void LLDir::setDumpDir( const std::string& path )
+{
+    LLDir::sDumpDir = path;
+    if (LLStringUtil::endsWith(sDumpDir, mDirDelimiter))
+    {
+        sDumpDir.erase(sDumpDir.size() - mDirDelimiter.size());
+    }
+}
+
+const std::string &LLDir::getDumpDir() const
+{
+    if (sDumpDir.empty() )
+    {
+        LLUUID uid;
+        uid.generate();
+        
+        sDumpDir = gDirUtilp->getExpandedFilename(LL_PATH_LOGS, "")
+                    + "dump-" + uid.asString();
+
+        dir_exists_or_crash(sDumpDir);  
+    }
+
+	return LLDir::sDumpDir;
+}
+
+const std::string &LLDir::getPerAccountChatLogsDir() const
+{
+	return mPerAccountChatLogsDir;
+}
+
+const std::string &LLDir::getTempDir() const
+{
+	return mTempDir;
+}
+
+const std::string  LLDir::getCacheDir(bool get_default) const
+{
+	if (mCacheDir.empty() || get_default)
+	{
+		if (!mDefaultCacheDir.empty())
+		{	// Set at startup - can't set here due to const API
+			return mDefaultCacheDir;
+		}
+		
+		std::string res = buildSLOSCacheDir();
+		return res;
+	}
+	else
+	{
+		return mCacheDir;
+	}
+}
+
+// Return the default cache directory
+std::string LLDir::buildSLOSCacheDir() const
+{
+	std::string res;
+	if (getOSCacheDir().empty())
+	{
+		if (getOSUserAppDir().empty())
+		{
+			res = "data";
+		}
+		else
+		{
+			res = add(getOSUserAppDir(), "cache");
+		}
+	}
+	else
+	{
+		res = add(getOSCacheDir(), "SecondLife");
+	}
+	return res;
+}
+
+
+
+const std::string &LLDir::getOSCacheDir() const
+{
+	return mOSCacheDir;
+}
+
+
+const std::string &LLDir::getCAFile() const
+{
+	return mCAFile;
+}
+
+const std::string &LLDir::getDirDelimiter() const
+{
+	return mDirDelimiter;
+}
+
+const std::string& LLDir::getDefaultSkinDir() const
+{
+	return mDefaultSkinDir;
+}
+
+const std::string &LLDir::getSkinDir() const
+{
+	return mSkinDir;
+}
+
+const std::string &LLDir::getUserDefaultSkinDir() const
+{
+    return mUserDefaultSkinDir;
+}
+
+const std::string &LLDir::getUserSkinDir() const
+{
+	return mUserSkinDir;
+}
+
+const std::string LLDir::getSkinBaseDir() const
+{
+	return mSkinBaseDir;
+}
+
+const std::string &LLDir::getLLPluginDir() const
+{
+	return mLLPluginDir;
+}
+
+const std::string &LLDir::getUserName() const
+{
+	return mUserName;
+}
+
+static std::string ELLPathToString(ELLPath location)
+{
+	typedef std::map<ELLPath, const char*> ELLPathMap;
+#define ENT(symbol) (symbol, #symbol)
+	static const ELLPathMap sMap = map_list_of
+		ENT(LL_PATH_NONE)
+		ENT(LL_PATH_USER_SETTINGS)
+		ENT(LL_PATH_APP_SETTINGS)
+		ENT(LL_PATH_PER_SL_ACCOUNT) // returns/expands to blank string if we don't know the account name yet
+		ENT(LL_PATH_CACHE)
+		ENT(LL_PATH_CHARACTER)
+		ENT(LL_PATH_HELP)
+		ENT(LL_PATH_LOGS)
+		ENT(LL_PATH_TEMP)
+		ENT(LL_PATH_SKINS)
+		ENT(LL_PATH_TOP_SKIN)
+		ENT(LL_PATH_CHAT_LOGS)
+		ENT(LL_PATH_PER_ACCOUNT_CHAT_LOGS)
+		ENT(LL_PATH_USER_SKIN)
+		ENT(LL_PATH_LOCAL_ASSETS)
+		ENT(LL_PATH_EXECUTABLE)
+		ENT(LL_PATH_DEFAULT_SKIN)
+		ENT(LL_PATH_FONTS)
+		ENT(LL_PATH_LAST)
+	;
+#undef ENT
+
+	ELLPathMap::const_iterator found = sMap.find(location);
+	if (found != sMap.end())
+		return found->second;
+	return STRINGIZE("Invalid ELLPath value " << location);
+}
+
+std::string LLDir::getExpandedFilename(ELLPath location, const std::string& filename) const
+{
+	return getExpandedFilename(location, "", filename);
+}
+
+std::string LLDir::getExpandedFilename(ELLPath location, const std::string& subdir, const std::string& filename) const
+{
+	return getExpandedFilename(location, "", subdir, filename);
+}
+
+std::string LLDir::getExpandedFilename(ELLPath location, const std::string& subdir1, const std::string& subdir2, const std::string& in_filename) const
+{
+	std::string prefix;
+	switch (location)
+	{
+	case LL_PATH_NONE:
+		// Do nothing
+		break;
+
+	case LL_PATH_APP_SETTINGS:
+		prefix = add(getAppRODataDir(), "app_settings");
+		break;
+	
+	case LL_PATH_CHARACTER:
+		prefix = add(getAppRODataDir(), "character");
+		break;
+		
+	case LL_PATH_HELP:
+		prefix = "help";
+		break;
+		
+	case LL_PATH_CACHE:
+		prefix = getCacheDir();
+		break;
+		
+    case LL_PATH_DUMP:
+        prefix=getDumpDir();
+        break;
+            
+	case LL_PATH_USER_SETTINGS:
+		prefix = add(getOSUserAppDir(), "user_settings");
+		break;
+
+	case LL_PATH_PER_SL_ACCOUNT:
+		prefix = getLindenUserDir();
+		if (prefix.empty())
+		{
+			// if we're asking for the per-SL-account directory but we haven't
+			// logged in yet (or otherwise don't know the account name from
+			// which to build this string), then intentionally return a blank
+			// string to the caller and skip the below warning about a blank
+			// prefix.
+			LL_DEBUGS("LLDir") << "getLindenUserDir() not yet set: "
+							   << ELLPathToString(location)
+							   << ", '" << subdir1 << "', '" << subdir2 << "', '" << in_filename
+							   << "' => ''" << LL_ENDL;
+			return std::string();
+		}
+		break;
+		
+	case LL_PATH_CHAT_LOGS:
+		prefix = getChatLogsDir();
+		break;
+		
+	case LL_PATH_PER_ACCOUNT_CHAT_LOGS:
+		prefix = getPerAccountChatLogsDir();
+		if (prefix.empty())
+		{
+			// potentially directory was not set yet
+			// intentionally return a blank string to the caller
+			LL_DEBUGS("LLDir") << "Conversation log directory is not yet set" << LL_ENDL;
+			return std::string();
+		}
+		break;
+
+	case LL_PATH_LOGS:
+		prefix = add(getOSUserAppDir(), "logs");
+		break;
+
+	case LL_PATH_TEMP:
+		prefix = getTempDir();
+		break;
+
+	case LL_PATH_TOP_SKIN:
+		prefix = getSkinDir();
+		break;
+
+	case LL_PATH_DEFAULT_SKIN:
+		prefix = getDefaultSkinDir();
+		break;
+
+	case LL_PATH_USER_SKIN:
+		prefix = getUserSkinDir();
+		break;
+
+	case LL_PATH_SKINS:
+		prefix = getSkinBaseDir();
+		break;
+
+	case LL_PATH_LOCAL_ASSETS:
+		prefix = add(getAppRODataDir(), "local_assets");
+		break;
+
+	case LL_PATH_EXECUTABLE:
+		prefix = getExecutableDir();
+		break;
+		
+	case LL_PATH_FONTS:
+		prefix = add(getAppRODataDir(), "fonts");
+		break;
+		
+	default:
+		llassert(0);
+	}
+
+	if (prefix.empty())
+	{
+		LL_WARNS() << ELLPathToString(location)
+				<< ", '" << subdir1 << "', '" << subdir2 << "', '" << in_filename
+				<< "': prefix is empty, possible bad filename" << LL_ENDL;
+	}
+
+	std::string expanded_filename = add(prefix, subdir1, subdir2);
+	if (expanded_filename.empty() && in_filename.empty())
+	{
+		return "";
+	}
+	// Use explicit concatenation here instead of another add() call. Callers
+	// passing in_filename as "" expect to obtain a pathname ending with
+	// mDirSeparator so they can later directly concatenate with a specific
+	// filename. A caller using add() doesn't care, but there's still code
+	// loose in the system that uses std::string::operator+().
+	expanded_filename += mDirDelimiter;
+	expanded_filename += in_filename;
+
+	LL_DEBUGS("LLDir") << ELLPathToString(location)
+					   << ", '" << subdir1 << "', '" << subdir2 << "', '" << in_filename
+					   << "' => '" << expanded_filename << "'" << LL_ENDL;
+	return expanded_filename;
+}
+
+std::string LLDir::getBaseFileName(const std::string& filepath, bool strip_exten) const
+{
+	std::size_t offset = filepath.find_last_of(getDirDelimiter());
+	offset = (offset == std::string::npos) ? 0 : offset+1;
+	std::string res = filepath.substr(offset, std::string::npos);
+	if (strip_exten)
+	{
+		offset = res.find_last_of('.');
+		if (offset != std::string::npos &&
+		    offset != 0) // if basename STARTS with '.', don't strip
+		{
+			res = res.substr(0, offset);
+		}
+	}
+	return res;
+}
+
+std::string LLDir::getDirName(const std::string& filepath) const
+{
+	std::size_t offset = filepath.find_last_of(getDirDelimiter());
+	S32 len = (offset == std::string::npos) ? 0 : offset;
+	std::string dirname = filepath.substr(0, len);
+	return dirname;
+}
+
+std::string LLDir::getExtension(const std::string& filepath) const
+{
+	if (filepath.empty())
+		return std::string();
+	std::string basename = getBaseFileName(filepath, false);
+	std::size_t offset = basename.find_last_of('.');
+	std::string exten = (offset == std::string::npos || offset == 0) ? "" : basename.substr(offset+1);
+	LLStringUtil::toLower(exten);
+	return exten;
+}
+
+std::string LLDir::findSkinnedFilenameBaseLang(const std::string &subdir,
+											   const std::string &filename,
+											   ESkinConstraint constraint) const
+{
+	// This implementation is basically just as described in the declaration comments.
+	std::vector<std::string> found(findSkinnedFilenames(subdir, filename, constraint));
+	if (found.empty())
+	{
+		return "";
+	}
+	return found.front();
+}
+
+std::string LLDir::findSkinnedFilename(const std::string &subdir,
+									   const std::string &filename,
+									   ESkinConstraint constraint) const
+{
+	// This implementation is basically just as described in the declaration comments.
+	std::vector<std::string> found(findSkinnedFilenames(subdir, filename, constraint));
+	if (found.empty())
+	{
+		return "";
+	}
+	return found.back();
+}
+
+// This method exists because the two code paths for
+// findSkinnedFilenames(ALL_SKINS) and findSkinnedFilenames(CURRENT_SKIN) must
+// generate the list of candidate pathnames in identical ways. The only
+// difference is in the body of the inner loop.
+template <typename FUNCTION>
+void LLDir::walkSearchSkinDirs(const std::string& subdir,
+							   const std::vector<std::string>& subsubdirs,
+							   const std::string& filename,
+							   const FUNCTION& function) const
+{
+	BOOST_FOREACH(std::string skindir, mSearchSkinDirs)
+	{
+		std::string subdir_path(add(skindir, subdir));
+		BOOST_FOREACH(std::string subsubdir, subsubdirs)
+		{
+			std::string full_path(add(subdir_path, subsubdir, filename));
+			if (fileExists(full_path))
+			{
+				function(subsubdir, full_path);
+			}
+		}
+	}
+}
+
+// ridiculous little helper function that should go away when we can use lambda
+inline void push_back(std::vector<std::string>& vector, const std::string& value)
+{
+	vector.push_back(value);
+}
+
+typedef std::map<std::string, std::string> StringMap;
+// ridiculous little helper function that should go away when we can use lambda
+inline void store_in_map(StringMap& map, const std::string& key, const std::string& value)
+{
+	map[key] = value;
+}
+
+std::vector<std::string> LLDir::findSkinnedFilenames(const std::string& subdir,
+													 const std::string& filename,
+													 ESkinConstraint constraint) const
+{
+	// Recognize subdirs that have no localization.
+	static const std::set<std::string> sUnlocalized = list_of
+		("")                        // top-level directory not localized
+		("textures")                // textures not localized
+	;
+
+	LL_DEBUGS("LLDir") << "subdir '" << subdir << "', filename '" << filename
+					   << "', constraint "
+					   << ((constraint == CURRENT_SKIN)? "CURRENT_SKIN" : "ALL_SKINS")
+					   << LL_ENDL;
+
+	// Build results vector.
+	std::vector<std::string> results;
+	// Disallow filenames that may escape subdir
+	if (filename.find("..") != std::string::npos)
+	{
+		LL_WARNS("LLDir") << "Ignoring potentially relative filename '" << filename << "'" << LL_ENDL;
+		return results;
+	}
+
+	// Cache the default language directory for each subdir we've encountered.
+	// A cache entry whose value is the empty string means "not localized,
+	// don't bother checking again."
+	static StringMap sLocalized;
+
+	// Check whether we've already discovered if this subdir is localized.
+	StringMap::const_iterator found = sLocalized.find(subdir);
+	if (found == sLocalized.end())
+	{
+		// We have not yet determined that. Is it one of the subdirs "known"
+		// to be unlocalized?
+		if (sUnlocalized.find(subdir) != sUnlocalized.end())
+		{
+			// This subdir is known to be unlocalized. Remember that.
+			found = sLocalized.insert(StringMap::value_type(subdir, "")).first;
+		}
+		else
+		{
+			// We do not recognize this subdir. Investigate.
+			std::string subdir_path(add(getDefaultSkinDir(), subdir));
+			if (fileExists(add(subdir_path, "en")))
+			{
+				// defaultSkinDir/subdir contains subdir "en". That's our
+				// default language; this subdir is localized.
+				found = sLocalized.insert(StringMap::value_type(subdir, "en")).first;
+			}
+			else if (fileExists(add(subdir_path, "en-us")))
+			{
+				// defaultSkinDir/subdir contains subdir "en-us" but not "en".
+				// Set as default language; this subdir is localized.
+				found = sLocalized.insert(StringMap::value_type(subdir, "en-us")).first;
+			}
+			else
+			{
+				// defaultSkinDir/subdir contains neither "en" nor "en-us".
+				// Assume it's not localized. Remember that assumption.
+				found = sLocalized.insert(StringMap::value_type(subdir, "")).first;
+			}
+		}
+	}
+	// Every code path above should have resulted in 'found' becoming a valid
+	// iterator to an entry in sLocalized.
+	llassert(found != sLocalized.end());
+
+	// Now -- is this subdir localized, or not? The answer determines what
+	// subdirectories we check (under subdir) for the requested filename.
+	std::vector<std::string> subsubdirs;
+	if (found->second.empty())
+	{
+		// subdir is not localized. filename should be located directly within it.
+		subsubdirs.push_back("");
+	}
+	else
+	{
+		// subdir is localized, and found->second is the default language
+		// directory within it. Check both the default language and the
+		// current language -- if it differs from the default, of course.
+		subsubdirs.push_back(found->second);
+		if (mLanguage != found->second)
+		{
+			subsubdirs.push_back(mLanguage);
+		}
+	}
+
+	// The process we use depends on 'constraint'.
+	if (constraint != CURRENT_SKIN) // meaning ALL_SKINS
+	{
+		// ALL_SKINS is simpler: just return every pathname generated by
+		// walkSearchSkinDirs(). Tricky bit: walkSearchSkinDirs() passes its
+		// FUNCTION the subsubdir as well as the full pathname. We just want
+		// the full pathname.
+		walkSearchSkinDirs(subdir, subsubdirs, filename,
+						   boost::bind(push_back, boost::ref(results), _2));
+	}
+	else                            // CURRENT_SKIN
+	{
+		// CURRENT_SKIN turns out to be a bit of a misnomer because we might
+		// still return files from two different skins. In any case, this
+		// value of 'constraint' means we will return at most two paths: one
+		// for the default language, one for the current language (supposing
+		// those differ).
+		// It is important to allow a user to override only the localization
+		// for a particular file, for all viewer installs, without also
+		// overriding the default-language file.
+		// It is important to allow a user to override only the default-
+		// language file, for all viewer installs, without also overriding the
+		// applicable localization of that file.
+		// Therefore, treat the default language and the current language as
+		// two separate cases. For each, capture the most-specialized file
+		// that exists.
+		// Use a map keyed by subsubdir (i.e. language code). This allows us
+		// to handle the case of a single subsubdirs entry with the same logic
+		// that handles two. For every real file path generated by
+		// walkSearchSkinDirs(), update the map entry for its subsubdir.
+		StringMap path_for;
+		walkSearchSkinDirs(subdir, subsubdirs, filename,
+						   boost::bind(store_in_map, boost::ref(path_for), _1, _2));
+		// Now that we have a path for each of the default language and the
+		// current language, copy them -- in proper order -- into results.
+		// Don't drive this by walking the map itself: it matters that we
+		// generate results in the same order as subsubdirs.
+		BOOST_FOREACH(std::string subsubdir, subsubdirs)
+		{
+			StringMap::const_iterator found(path_for.find(subsubdir));
+			if (found != path_for.end())
+			{
+				results.push_back(found->second);
+			}
+		}
+	}
+
+	LL_DEBUGS("LLDir") << empty;
+	const char* comma = "";
+	BOOST_FOREACH(std::string path, results)
+	{
+		LL_CONT << comma << "'" << path << "'";
+		comma = ", ";
+	}
+	LL_CONT << LL_ENDL;
+
+	return results;
+}
+
+std::string LLDir::getTempFilename() const
+{
+	LLUUID random_uuid;
+	std::string uuid_str;
+
+	random_uuid.generate();
+	random_uuid.toString(uuid_str);
+
+	return add(getTempDir(), uuid_str + ".tmp");
+}
+
+// static
+std::string LLDir::getScrubbedFileName(const std::string uncleanFileName)
+{
+	std::string name(uncleanFileName);
+	const std::string illegalChars(getForbiddenFileChars());
+	// replace any illegal file chars with and underscore '_'
+	for( unsigned int i = 0; i < illegalChars.length(); i++ )
+	{
+		int j = -1;
+		while((j = name.find(illegalChars[i])) > -1)
+		{
+			name[j] = '_';
+		}
+	}
+	return name;
+}
+
+// static
+std::string LLDir::getForbiddenFileChars()
+{
+	return "\\/:*?\"<>|";
+}
+
+void LLDir::setLindenUserDir(const std::string &username)
+{
+	// if the username isn't set, that's bad
+	if (!username.empty())
+	{
+		// some platforms have case-sensitive filesystems, so be
+		// utterly consistent with our firstname/lastname case.
+		std::string userlower(username);
+		LLStringUtil::toLower(userlower);
+		LLStringUtil::replaceChar(userlower, ' ', '_');
+		mLindenUserDir = add(getOSUserAppDir(), userlower);
+	}
+	else
+	{
+		LL_ERRS() << "NULL name for LLDir::setLindenUserDir" << LL_ENDL;
+	}
+
+	dumpCurrentDirectories();	
+}
+
+void LLDir::setChatLogsDir(const std::string &path)
+{
+	if (!path.empty() )
+	{
+		mChatLogsDir = path;
+	}
+	else
+	{
+		LL_WARNS() << "Invalid name for LLDir::setChatLogsDir" << LL_ENDL;
+	}
+}
+
+void LLDir::updatePerAccountChatLogsDir()
+{
+	mPerAccountChatLogsDir = add(getChatLogsDir(), mUserName);
+}
+
+void LLDir::setPerAccountChatLogsDir(const std::string &username)
+{
+	// if both first and last aren't set, assume we're grabbing the cached dir
+	if (!username.empty())
+	{
+		// some platforms have case-sensitive filesystems, so be
+		// utterly consistent with our firstname/lastname case.
+		std::string userlower(username);
+		LLStringUtil::toLower(userlower);
+		LLStringUtil::replaceChar(userlower, ' ', '_');
+
+		mUserName = userlower;
+		updatePerAccountChatLogsDir();
+	}
+	else
+	{
+		LL_ERRS() << "NULL name for LLDir::setPerAccountChatLogsDir" << LL_ENDL;
+	}
+}
+
+void LLDir::setSkinFolder(const std::string &skin_folder, const std::string& language)
+{
+	LL_DEBUGS("LLDir") << "Setting skin '" << skin_folder << "', language '" << language << "'"
+					   << LL_ENDL;
+	mSkinName = skin_folder;
+	mLanguage = language;
+
+	// This method is called multiple times during viewer initialization. Each
+	// time it's called, reset mSearchSkinDirs.
+	mSearchSkinDirs.clear();
+
+	// base skin which is used as fallback for all skinned files
+	// e.g. c:\program files\secondlife\skins\default
+	mDefaultSkinDir = getSkinBaseDir();
+	append(mDefaultSkinDir, "default");
+	// This is always the most general of the search skin directories.
+	addSearchSkinDir(mDefaultSkinDir);
+
+	mSkinDir = getSkinBaseDir();
+	append(mSkinDir, skin_folder);
+	// Next level of generality is a skin installed with the viewer.
+	addSearchSkinDir(mSkinDir);
+
+	// user modifications to skins, current and default
+	// e.g. c:\documents and settings\users\username\application data\second life\skins\dazzle
+	mUserSkinDir = getOSUserAppDir();
+	append(mUserSkinDir, "skins");
+	mUserDefaultSkinDir = mUserSkinDir;
+	append(mUserDefaultSkinDir, "default");
+	append(mUserSkinDir, skin_folder);
+	// Next level of generality is user modifications to default skin...
+	addSearchSkinDir(mUserDefaultSkinDir);
+	// then user-defined skins.
+	addSearchSkinDir(mUserSkinDir);
+}
+
+void LLDir::addSearchSkinDir(const std::string& skindir)
+{
+	if (std::find(mSearchSkinDirs.begin(), mSearchSkinDirs.end(), skindir) == mSearchSkinDirs.end())
+	{
+		LL_DEBUGS("LLDir") << "search skin: '" << skindir << "'" << LL_ENDL;
+		mSearchSkinDirs.push_back(skindir);
+	}
+}
+
+std::string LLDir::getSkinFolder() const
+{
+	return mSkinName;
+}
+
+std::string LLDir::getLanguage() const
+{
+	return mLanguage;
+}
+
+bool LLDir::setCacheDir(const std::string &path)
+{
+	if (path.empty() )
+	{
+		// reset to default
+		mCacheDir = "";
+		return true;
+	}
+	else
+	{
+		LLFile::mkdir(path);
+		std::string tempname = add(path, "temp");
+		LLFILE* file = LLFile::fopen(tempname,"wt");
+		if (file)
+		{
+			fclose(file);
+			LLFile::remove(tempname);
+			mCacheDir = path;
+			return true;
+		}
+		return false;
+	}
+}
+
+void LLDir::dumpCurrentDirectories(LLError::ELevel level)
+{
+	LL_VLOGS(level, "AppInit","Directories") << "Current Directories:" << LL_ENDL;
+
+	LL_VLOGS(level, "AppInit", "Directories") << "  CurPath:               " << getCurPath() << LL_ENDL;
+	LL_VLOGS(level, "AppInit", "Directories") << "  AppName:               " << getAppName() << LL_ENDL;
+	LL_VLOGS(level, "AppInit", "Directories") << "  ExecutableFilename:    " << getExecutableFilename() << LL_ENDL;
+	LL_VLOGS(level, "AppInit", "Directories") << "  ExecutableDir:         " << getExecutableDir() << LL_ENDL;
+	LL_VLOGS(level, "AppInit", "Directories") << "  ExecutablePathAndName: " << getExecutablePathAndName() << LL_ENDL;
+	LL_VLOGS(level, "AppInit", "Directories") << "  WorkingDir:            " << getWorkingDir() << LL_ENDL;
+	LL_VLOGS(level, "AppInit", "Directories") << "  AppRODataDir:          " << getAppRODataDir() << LL_ENDL;
+	LL_VLOGS(level, "AppInit", "Directories") << "  OSUserDir:             " << getOSUserDir() << LL_ENDL;
+	LL_VLOGS(level, "AppInit", "Directories") << "  OSUserAppDir:          " << getOSUserAppDir() << LL_ENDL;
+	LL_VLOGS(level, "AppInit", "Directories") << "  LindenUserDir:         " << getLindenUserDir() << LL_ENDL;
+	LL_VLOGS(level, "AppInit", "Directories") << "  TempDir:               " << getTempDir() << LL_ENDL;
+	LL_VLOGS(level, "AppInit", "Directories") << "  CAFile:                " << getCAFile() << LL_ENDL;
+	LL_VLOGS(level, "AppInit", "Directories") << "  SkinBaseDir:           " << getSkinBaseDir() << LL_ENDL;
+	LL_VLOGS(level, "AppInit", "Directories") << "  SkinDir:               " << getSkinDir() << LL_ENDL;
+}
+
+void LLDir::append(std::string& destpath, const std::string& name) const
+{
+	// Delegate question of whether we need a separator to helper method.
+	SepOff sepoff(needSep(destpath, name));
+	if (sepoff.first)               // do we need a separator?
+	{
+		destpath += mDirDelimiter;
+	}
+	// If destpath ends with a separator, AND name starts with one, skip
+	// name's leading separator.
+	destpath += name.substr(sepoff.second);
+}
+
+LLDir::SepOff LLDir::needSep(const std::string& path, const std::string& name) const
+{
+	if (path.empty() || name.empty())
+	{
+		// If either path or name are empty, we do not need a separator
+		// between them.
+		return SepOff(false, 0);
+	}
+	// Here we know path and name are both non-empty. But if path already ends
+	// with a separator, or if name already starts with a separator, we need
+	// not add one.
+	std::string::size_type seplen(mDirDelimiter.length());
+	bool path_ends_sep(path.substr(path.length() - seplen) == mDirDelimiter);
+	bool name_starts_sep(name.substr(0, seplen) == mDirDelimiter);
+	if ((! path_ends_sep) && (! name_starts_sep))
+	{
+		// If neither path nor name brings a separator to the junction, then
+		// we need one.
+		return SepOff(true, 0);
+	}
+	if (path_ends_sep && name_starts_sep)
+	{
+		// But if BOTH path and name bring a separator, we need not add one.
+		// Moreover, we should actually skip the leading separator of 'name'.
+		return SepOff(false, (unsigned short)seplen);
+	}
+	// Here we know that either path_ends_sep or name_starts_sep is true --
+	// but not both. So don't add a separator, and don't skip any characters:
+	// simple concatenation will do the trick.
+	return SepOff(false, 0);
+}
+
+void dir_exists_or_crash(const std::string &dir_name)
+{
+#if LL_WINDOWS
+	// *FIX: lame - it doesn't do the same thing on windows. not so
+	// important since we don't deploy simulator to windows boxes.
+	LLFile::mkdir(dir_name, 0700);
+#else
+	struct stat dir_stat;
+	if(0 != LLFile::stat(dir_name, &dir_stat))
+	{
+		S32 stat_rv = errno;
+		if(ENOENT == stat_rv)
+		{
+		   if(0 != LLFile::mkdir(dir_name, 0700))		// octal
+		   {
+			   LL_ERRS() << "Unable to create directory: " << dir_name << LL_ENDL;
+		   }
+		}
+		else
+		{
+			LL_ERRS() << "Unable to stat: " << dir_name << " errno = " << stat_rv
+				   << LL_ENDL;
+		}
+	}
+	else
+	{
+		// data_dir exists, make sure it's a directory.
+		if(!S_ISDIR(dir_stat.st_mode))
+		{
+			LL_ERRS() << "Data directory collision: " << dir_name << LL_ENDL;
+		}
+	}
+#endif
+}