gecko-dev/xpcom/build/Omnijar.h
Jim Chen 93b208fc7e Bug 1265621 - Expose outer zip readers in Omnijar::GetReader; r=froydnj
Previously, Omnijar::GetReader(nsIFile*) returned nullptr when using
nested jars. This patch makes it return the outer jar reader in that
case, so we don't end up opening the outer jar file again.
2016-04-28 16:07:02 -04:00

161 lines
4.4 KiB
C++

/* -*- 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);
/**
* 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);
/**
* 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 */
} /* namespace mozilla */
#endif /* mozilla_Omnijar_h */