Case insensitive string compare inside installers

src/util/io/package_manager.cpp

@@ -348,7 +348,7 @@ bool PackageDirectory::actual_install(const InstallablePackage& package, const S
 	const Packaged::FileInfos& file_infos = installer.getFileInfos();
 	for (Packaged::FileInfos::const_iterator it = file_infos.begin() ; it != file_infos.end() ; ++it) {
 		String file = it->first;
-		if (!is_substr(file,0,name)) continue; // not the right package
+		if (!is_substr_i(file,0,name)) continue; // not the right package
 		// correct filename
 		String local_file = install_dir + file.substr(name.length());
 		create_parent_dirs(local_file);

src/util/string.cpp

@@ -370,6 +370,17 @@ bool is_substr(const String& str, size_t pos, const String& cmp) {
 	return is_substr(str, pos, cmp.c_str());
 }
 
+
+bool is_substr_i(const String& str, size_t pos, const Char* cmp) {
+	for (String::const_iterator it = str.begin() + pos ; *cmp && it < str.end() ; ++cmp, ++it) {
+		if (toLower(*cmp) != toLower(*it)) return false;
+	}
+	return *cmp == _('\0');
+}
+bool is_substr_i(const String& str, size_t pos, const String& cmp) {
+	return is_substr_i(str, pos, cmp.c_str());
+}
+
 bool cannocial_name_compare(const String& as, const Char* b) {
 	const Char* a = as.c_str();
 	while (true) {

src/util/string.hpp

@@ -178,6 +178,11 @@ bool is_substr(const String& str, size_t pos, const Char* cmp);
 /// Return whether str contains the string cmp at position pos
 bool is_substr(const String& str, size_t pos, const String& cmp);
 
+/// Return whether str contains the string cmp at position pos, case insensitive compare
+bool is_substr_i(const String& str, size_t pos, const Char* cmp);
+/// Return whether str contains the string cmp at position pos, case insensitive compare
+bool is_substr_i(const String& str, size_t pos, const String& cmp);
+
 /// Compare two strings for equality, b may contain '_' where a contains ' '
 bool cannocial_name_compare(const String& a, const Char* b);