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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_Omnijar_h
+#define mozilla_Omnijar_h
+
+#include "nscore.h"
+#include "nsCOMPtr.h"
+#include "nsString.h"
+#include "nsIFile.h"
+#include "nsZipArchive.h"
+
+#include "mozilla/StaticPtr.h"
+
+namespace mozilla {
+
+class Omnijar {
+ private:
+ /**
+ * Store an nsIFile for an omni.jar. We can store two paths here, one
+ * for GRE (corresponding to resource://gre/) and one for APP
+ * (corresponding to resource:/// and resource://app/), but only
+ * store one when both point to the same location (unified).
+ */
+ static StaticRefPtr<nsIFile> sPath[2];
+
+ /**
+ * Cached nsZipArchives for the corresponding sPath
+ */
+ static StaticRefPtr<nsZipArchive> sReader[2];
+
+ /**
+ * Cached nsZipArchives for the outer jar, when using nested jars.
+ * Otherwise nullptr.
+ */
+ static StaticRefPtr<nsZipArchive> sOuterReader[2];
+
+ /**
+ * Has Omnijar::Init() been called?
+ */
+ static bool sInitialized;
+
+ /**
+ * Is using unified GRE/APP jar?
+ */
+ static bool sIsUnified;
+
+ public:
+ enum Type { GRE = 0, APP = 1 };
+
+ private:
+ /**
+ * Returns whether we are using nested jars.
+ */
+ static inline bool IsNested(Type aType) {
+ MOZ_ASSERT(IsInitialized(), "Omnijar not initialized");
+ return !!sOuterReader[aType];
+ }
+
+ /**
+ * Returns a nsZipArchive pointer for the outer jar file when using nested
+ * jars. Returns nullptr in the same cases GetPath() would, or if not using
+ * nested jars.
+ */
+ static inline already_AddRefed<nsZipArchive> GetOuterReader(Type aType) {
+ MOZ_ASSERT(IsInitialized(), "Omnijar not initialized");
+ RefPtr<nsZipArchive> reader = sOuterReader[aType].get();
+ return reader.forget();
+ }
+
+ public:
+ /**
+ * Returns whether SetBase has been called at least once with
+ * a valid nsIFile
+ */
+ static inline bool IsInitialized() { return sInitialized; }
+
+ /**
+ * Initializes the Omnijar API with the given directory or file for GRE and
+ * APP. Each of the paths given can be:
+ * - a file path, pointing to the omnijar file,
+ * - a directory path, pointing to a directory containing an "omni.jar" file,
+ * - nullptr for autodetection of an "omni.jar" file.
+ */
+ static void Init(nsIFile* aGrePath = nullptr, nsIFile* aAppPath = nullptr);
+
+ /**
+ * Initializes the Omnijar API for a child process, given its argument
+ * list, if the `-greomni` flag and optionally also the `-appomni` flag
+ * is present. (`-appomni` is absent in the case of a unified jar.) If
+ * neither flag is present, the Omnijar API is not initialized. The
+ * flags, if present, will be removed from the argument list.
+ */
+ static void ChildProcessInit(int& aArgc, char** aArgv);
+
+ /**
+ * Cleans up the Omnijar API
+ */
+ static void CleanUp();
+
+ /**
+ * Returns an nsIFile pointing to the omni.jar file for GRE or APP.
+ * Returns nullptr when there is no corresponding omni.jar.
+ * Also returns nullptr for APP in the unified case.
+ */
+ static inline already_AddRefed<nsIFile> GetPath(Type aType) {
+ MOZ_ASSERT(IsInitialized(), "Omnijar not initialized");
+ nsCOMPtr<nsIFile> path = sPath[aType].get();
+ return path.forget();
+ }
+
+ /**
+ * Returns whether GRE or APP use an omni.jar. Returns PR_False for
+ * APP when using an omni.jar in the unified case.
+ */
+ static inline bool HasOmnijar(Type aType) {
+ MOZ_ASSERT(IsInitialized(), "Omnijar not initialized");
+ return !!sPath[aType];
+ }
+
+ /**
+ * Returns a nsZipArchive pointer for the omni.jar file for GRE or
+ * APP. Returns nullptr in the same cases GetPath() would.
+ */
+ static inline already_AddRefed<nsZipArchive> GetReader(Type aType) {
+ MOZ_ASSERT(IsInitialized(), "Omnijar not initialized");
+ RefPtr<nsZipArchive> reader = sReader[aType].get();
+ return reader.forget();
+ }
+
+ /**
+ * Returns a nsZipArchive pointer for the given path IAOI the given
+ * path is the omni.jar for either GRE or APP.
+ */
+ static already_AddRefed<nsZipArchive> GetReader(nsIFile* aPath);
+
+ /**
+ * In the case of a nested omnijar, this returns the inner reader for the
+ * omnijar if aPath points to the outer archive and aEntry is the omnijar
+ * entry name. Returns null otherwise.
+ * In concrete terms: On Android the omnijar is nested inside the apk archive.
+ * GetReader("path/to.apk") returns the outer reader and GetInnerReader(
+ * "path/to.apk", "assets/omni.ja") returns the inner reader.
+ */
+ static already_AddRefed<nsZipArchive> GetInnerReader(
+ nsIFile* aPath, const nsACString& aEntry);
+
+ /**
+ * Returns the URI string corresponding to the omni.jar or directory
+ * for GRE or APP. i.e. jar:/path/to/omni.jar!/ for omni.jar and
+ * /path/to/base/dir/ otherwise. Returns an empty string for APP in
+ * the unified case.
+ * The returned URI is guaranteed to end with a slash.
+ */
+ static nsresult GetURIString(Type aType, nsACString& aResult);
+
+ private:
+ /**
+ * Used internally, respectively by Init() and CleanUp()
+ */
+ static void InitOne(nsIFile* aPath, Type aType);
+ static void CleanUpOne(Type aType);
+}; /* class Omnijar */
+
+/**
+ * Returns whether or not the currently running build is an unpackaged
+ * developer build. This check is implemented by looking for omni.ja in the
+ * the obj/dist dir. We use this routine to detect when the build dir will
+ * use symlinks to the repo and object dir.
+ */
+inline bool IsPackagedBuild() {
+ return Omnijar::HasOmnijar(mozilla::Omnijar::GRE);
+}
+
+} /* namespace mozilla */
+
+#endif /* mozilla_Omnijar_h */