diff --git a/common/platform/api/quiche_file_utils.h b/common/platform/api/quiche_file_utils.h
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+++ b/common/platform/api/quiche_file_utils.h
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+// Copyright 2021 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// This header contains basic filesystem functions for use in unit tests and CLI
+// tools.  Note that those are not 100% suitable for production use, as in, they
+// might be prone to race conditions and not always handle non-ASCII filenames
+// correctly.
+#ifndef QUICHE_COMMON_PLATFORM_API_QUICHE_FILE_UTILS_H_
+#define QUICHE_COMMON_PLATFORM_API_QUICHE_FILE_UTILS_H_
+
+#include <string>
+#include <vector>
+
+#include "absl/strings/string_view.h"
+#include "absl/types/optional.h"
+
+namespace quiche {
+
+// Join two paths in a platform-specific way.  Returns |a| if |b| is empty, and
+// vice versa.
+std::string JoinPath(absl::string_view a, absl::string_view b);
+
+// Reads the entire file into the memory.
+absl::optional<std::string> ReadFileContents(absl::string_view file);
+
+// Lists all files and directories in the directory specified by |path|. Returns
+// true on success, false on failure.
+bool EnumerateDirectory(absl::string_view path,
+                        std::vector<std::string>& directories,
+                        std::vector<std::string>& files);
+
+// Recursively enumerates all of the files in the directory and all of the
+// internal subdirectories.  Has a fairly small recursion limit.
+bool EnumerateDirectoryRecursively(absl::string_view path,
+                                   std::vector<std::string>& files);
+
+}  // namespace quiche
+
+#endif  // QUICHE_COMMON_PLATFORM_API_QUICHE_FILE_UTILS_H_