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diff --git a/tools/aapt2/Files.h b/tools/aapt2/Files.h
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+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef AAPT_FILES_H
+#define AAPT_FILES_H
+
+#include "Logger.h"
+#include "Source.h"
+#include "StringPiece.h"
+
+#include <cassert>
+#include <string>
+#include <vector>
+
+namespace aapt {
+
+#ifdef _WIN32
+constexpr const char sDirSep = '\\';
+#else
+constexpr const char sDirSep = '/';
+#endif
+
+enum class FileType {
+    kUnknown = 0,
+    kNonexistant,
+    kRegular,
+    kDirectory,
+    kCharDev,
+    kBlockDev,
+    kFifo,
+    kSymlink,
+    kSocket,
+};
+
+FileType getFileType(const StringPiece& path);
+
+/*
+ * Lists files under the directory `root`. Files are listed
+ * with just their leaf (filename) names.
+ */
+std::vector<std::string> listFiles(const StringPiece& root);
+
+/*
+ * Appends a path to `base`, separated by the directory separator.
+ */
+void appendPath(std::string* base, const StringPiece& part);
+
+/*
+ * Appends a series of paths to `base`, separated by the
+ * system directory separator.
+ */
+template <typename... Ts >
+void appendPath(std::string* base, const StringPiece& part, const Ts&... parts);
+
+/*
+ * Makes all the directories in `path`. The last element in the path
+ * is interpreted as a directory.
+ */
+bool mkdirs(const StringPiece& path);
+
+/*
+ * Filter that determines which resource files/directories are
+ * processed by AAPT. Takes a pattern string supplied by the user.
+ * Pattern format is specified in the
+ * FileFilter::setPattern(const std::string&) method.
+ */
+class FileFilter {
+public:
+    /*
+     * Patterns syntax:
+     * - Delimiter is :
+     * - Entry can start with the flag ! to avoid printing a warning
+     *   about the file being ignored.
+     * - Entry can have the flag "<dir>" to match only directories
+     *   or <file> to match only files. Default is to match both.
+     * - Entry can be a simplified glob "<prefix>*" or "*<suffix>"
+     *   where prefix/suffix must have at least 1 character (so that
+     *   we don't match a '*' catch-all pattern.)
+     * - The special filenames "." and ".." are always ignored.
+     * - Otherwise the full string is matched.
+     * - match is not case-sensitive.
+     */
+    bool setPattern(const StringPiece& pattern);
+
+    /**
+     * Applies the filter, returning true for pass, false for fail.
+     */
+    bool operator()(const std::string& filename, FileType type) const;
+
+private:
+    std::vector<std::string> mPatternTokens;
+};
+
+inline void appendPath(std::string* base, const StringPiece& part) {
+    assert(base);
+    *base += sDirSep;
+    base->append(part.data(), part.size());
+}
+
+template <typename... Ts >
+void appendPath(std::string* base, const StringPiece& part, const Ts&... parts) {
+    assert(base);
+    *base += sDirSep;
+    base->append(part.data(), part.size());
+    appendPath(base, parts...);
+}
+
+} // namespace aapt
+
+#endif // AAPT_FILES_H