xpcom/build/Omnijar.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_Omnijar_h
   8 #define mozilla_Omnijar_h
   9
  10 #include "nscore.h"
  11 #include "nsCOMPtr.h"
  12 #include "nsString.h"
  13 #include "nsIFile.h"
  14 #include "nsZipArchive.h"
  15
  16 #include "mozilla/StaticPtr.h"
  17
  18 namespace mozilla {
  19
  20 class Omnijar {
  21  private:
  22   /**
  23    * Store an nsIFile for an omni.jar. We can store two paths here, one
  24    * for GRE (corresponding to resource://gre/) and one for APP
  25    * (corresponding to resource:/// and resource://app/), but only
  26    * store one when both point to the same location (unified).
  27    */
  28   static StaticRefPtr<nsIFile> sPath[2];
  29
  30   /**
  31    * Cached nsZipArchives for the corresponding sPath
  32    */
  33   static StaticRefPtr<nsZipArchive> sReader[2];
  34
  35   /**
  36    * Cached nsZipArchives for the outer jar, when using nested jars.
  37    * Otherwise nullptr.
  38    */
  39   static StaticRefPtr<nsZipArchive> sOuterReader[2];
  40
  41   /**
  42    * Has Omnijar::Init() been called?
  43    */
  44   static bool sInitialized;
  45
  46   /**
  47    * Is using unified GRE/APP jar?
  48    */
  49   static bool sIsUnified;
  50
  51  public:
  52   enum Type { GRE = 0, APP = 1 };
  53
  54  private:
  55   /**
  56    * Returns whether we are using nested jars.
  57    */
  58   static inline bool IsNested(Type aType) {
  59     MOZ_ASSERT(IsInitialized(), "Omnijar not initialized");
  60     return !!sOuterReader[aType];
  61   }
  62
  63   /**
  64    * Returns a nsZipArchive pointer for the outer jar file when using nested
  65    * jars. Returns nullptr in the same cases GetPath() would, or if not using
  66    * nested jars.
  67    */
  68   static inline already_AddRefed<nsZipArchive> GetOuterReader(Type aType) {
  69     MOZ_ASSERT(IsInitialized(), "Omnijar not initialized");
  70     RefPtr<nsZipArchive> reader = sOuterReader[aType].get();
  71     return reader.forget();
  72   }
  73
  74  public:
  75   /**
  76    * Returns whether SetBase has been called at least once with
  77    * a valid nsIFile
  78    */
  79   static inline bool IsInitialized() { return sInitialized; }
  80
  81   /**
  82    * Initializes the Omnijar API with the given directory or file for GRE and
  83    * APP. Each of the paths given can be:
  84    * - a file path, pointing to the omnijar file,
  85    * - a directory path, pointing to a directory containing an "omni.jar" file,
  86    * - nullptr for autodetection of an "omni.jar" file.
  87    */
  88   static void Init(nsIFile* aGrePath = nullptr, nsIFile* aAppPath = nullptr);
  89
  90   /**
  91    * Cleans up the Omnijar API
  92    */
  93   static void CleanUp();
  94
  95   /**
  96    * Returns an nsIFile pointing to the omni.jar file for GRE or APP.
  97    * Returns nullptr when there is no corresponding omni.jar.
  98    * Also returns nullptr for APP in the unified case.
  99    */
 100   static inline already_AddRefed<nsIFile> GetPath(Type aType) {
 101     MOZ_ASSERT(IsInitialized(), "Omnijar not initialized");
 102     nsCOMPtr<nsIFile> path = sPath[aType].get();
 103     return path.forget();
 104   }
 105
 106   /**
 107    * Returns whether GRE or APP use an omni.jar. Returns PR_False for
 108    * APP when using an omni.jar in the unified case.
 109    */
 110   static inline bool HasOmnijar(Type aType) {
 111     MOZ_ASSERT(IsInitialized(), "Omnijar not initialized");
 112     return !!sPath[aType];
 113   }
 114
 115   /**
 116    * Returns a nsZipArchive pointer for the omni.jar file for GRE or
 117    * APP. Returns nullptr in the same cases GetPath() would.
 118    */
 119   static inline already_AddRefed<nsZipArchive> GetReader(Type aType) {
 120     MOZ_ASSERT(IsInitialized(), "Omnijar not initialized");
 121     RefPtr<nsZipArchive> reader = sReader[aType].get();
 122     return reader.forget();
 123   }
 124
 125   /**
 126    * Returns a nsZipArchive pointer for the given path IAOI the given
 127    * path is the omni.jar for either GRE or APP.
 128    */
 129   static already_AddRefed<nsZipArchive> GetReader(nsIFile* aPath);
 130
 131   /**
 132    * Returns the URI string corresponding to the omni.jar or directory
 133    * for GRE or APP. i.e. jar:/path/to/omni.jar!/ for omni.jar and
 134    * /path/to/base/dir/ otherwise. Returns an empty string for APP in
 135    * the unified case.
 136    * The returned URI is guaranteed to end with a slash.
 137    */
 138   static nsresult GetURIString(Type aType, nsACString& aResult);
 139
 140  private:
 141   /**
 142    * Used internally, respectively by Init() and CleanUp()
 143    */
 144   static void InitOne(nsIFile* aPath, Type aType);
 145   static void CleanUpOne(Type aType);
 146 }; /* class Omnijar */
 147
 148 } /* namespace mozilla */
 149
 150 #endif /* mozilla_Omnijar_h */