Revert "Merge branch 'master' of https://bitbucket.org/lindenlab/viewer into DRTVWR-519"

This reverts commit e61f485a04dc8c8ac6bcf6a24848359092884d14, reversing
changes made to 00c47d079f7e958e473ed4083a7f7691fa02dcd5.

1 files changed, 1134 insertions, 0 deletions

diff --git a/indra/llvfs/lldir.cpp b/indra/llvfs/lldir.cpp
new file mode 100644
index 0000000000..10fbc06c61
--- /dev/null
+++ b/indra/llvfs/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
+}