nsJAR.h

/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 nsJAR_h_
#define nsJAR_h_

#include "nscore.h"
#include "prio.h"
#include "plstr.h"
#include "mozilla/Logging.h"
#include "prinrval.h"

#include "mozilla/Mutex.h"
#include "nsIComponentManager.h"
#include "nsCOMPtr.h"
#include "nsClassHashtable.h"
#include "nsString.h"
#include "nsIFile.h"
#include "nsStringEnumerator.h"
#include "nsHashKeys.h"
#include "nsRefPtrHashtable.h"
#include "nsTHashtable.h"
#include "nsIZipReader.h"
#include "nsZipArchive.h"
#include "nsIObserverService.h"
#include "nsWeakReference.h"
#include "nsIObserver.h"
#include "mozilla/Attributes.h"

class nsZipReaderCache;

/*-------------------------------------------------------------------------
 * Class nsJAR declaration.
 * nsJAR serves as an XPCOM wrapper for nsZipArchive with the addition of
 * JAR manifest file parsing.
 *------------------------------------------------------------------------*/
class nsJAR final : public nsIZipReader
{
  // Allows nsJARInputStream to call the verification functions
  friend class nsJARInputStream;
  // Allows nsZipReaderCache to access mOuterZipEntry
  friend class nsZipReaderCache;

  private:

    virtual ~nsJAR();

  public:

    nsJAR();

    NS_DEFINE_STATIC_CID_ACCESSOR( NS_ZIPREADER_CID )

    NS_DECL_THREADSAFE_ISUPPORTS

    NS_DECL_NSIZIPREADER

    nsresult GetJarPath(nsACString& aResult);

    PRIntervalTime GetReleaseTime() {
        return mReleaseTime;
    }

    bool IsReleased() {
        return mReleaseTime != PR_INTERVAL_NO_TIMEOUT;
    }

    void SetReleaseTime() {
      mReleaseTime = PR_IntervalNow();
    }

    void ClearReleaseTime() {
      mReleaseTime = PR_INTERVAL_NO_TIMEOUT;
    }

    void SetZipReaderCache(nsZipReaderCache* cache) {
      mCache = cache;
    }

    nsresult GetNSPRFileDesc(PRFileDesc** aNSPRFileDesc);

  protected:

    //-- Private data members
    nsCOMPtr<nsIFile>        mZipFile;        // The zip/jar file on disk
    nsCString                mOuterZipEntry;  // The entry in the zip this zip is reading from
    RefPtr<nsZipArchive>     mZip;            // The underlying zip archive
    PRIntervalTime           mReleaseTime;    // used by nsZipReaderCache for flushing entries
    nsZipReaderCache*        mCache;          // if cached, this points to the cache it's contained in
    mozilla::Mutex           mLock;
    int64_t                  mMtime;
    bool                     mOpened;
    bool                     mIsOmnijar;

    nsresult LoadEntry(const nsACString& aFilename, nsCString& aBuf);
    int32_t  ReadLine(const char** src);
};

/**
 * nsJARItem
 *
 * An individual JAR entry. A set of nsJARItems matching a
 * supplied pattern are returned in a nsJAREnumerator.
 */
class nsJARItem : public nsIZipEntry
{
public:
    NS_DECL_THREADSAFE_ISUPPORTS
    NS_DECL_NSIZIPENTRY

    explicit nsJARItem(nsZipItem* aZipItem);

private:
    virtual ~nsJARItem() {}

    uint32_t     mSize;             /* size in original file */
    uint32_t     mRealsize;         /* inflated size */
    uint32_t     mCrc32;
    PRTime       mLastModTime;
    uint16_t     mCompression;
    uint32_t     mPermissions;
    bool mIsDirectory;
    bool mIsSynthetic;
};

/**
 * nsJAREnumerator
 *
 * Enumerates a list of files in a zip archive
 * (based on a pattern match in its member nsZipFind).
 */
class nsJAREnumerator final : public nsIUTF8StringEnumerator
{
public:
    NS_DECL_THREADSAFE_ISUPPORTS
    NS_DECL_NSIUTF8STRINGENUMERATOR

    explicit nsJAREnumerator(nsZipFind *aFind)
      : mFind(aFind), mName(nullptr), mNameLen(0) {
      NS_ASSERTION(mFind, "nsJAREnumerator: Missing zipFind.");
    }

private:
    nsZipFind    *mFind;
    const char*   mName;    // pointer to an name owned by mArchive -- DON'T delete
    uint16_t      mNameLen;

    ~nsJAREnumerator() { delete mFind; }
};

////////////////////////////////////////////////////////////////////////////////

#if defined(DEBUG_warren) || defined(DEBUG_jband)
#define ZIP_CACHE_HIT_RATE
#endif

class nsZipReaderCache : public nsIZipReaderCache, public nsIObserver,
                         public nsSupportsWeakReference
{
public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_NSIZIPREADERCACHE
  NS_DECL_NSIOBSERVER

  nsZipReaderCache();

  nsresult ReleaseZip(nsJAR* reader);

  typedef nsRefPtrHashtable<nsCStringHashKey, nsJAR> ZipsHashtable;

protected:

  virtual ~nsZipReaderCache();

  mozilla::Mutex        mLock;
  uint32_t              mCacheSize;
  ZipsHashtable         mZips;

#ifdef ZIP_CACHE_HIT_RATE
  uint32_t              mZipCacheLookups;
  uint32_t              mZipCacheHits;
  uint32_t              mZipCacheFlushes;
  uint32_t              mZipSyncMisses;
#endif

private:
  nsresult GetZip(nsIFile* zipFile, nsIZipReader* *result, bool failOnMiss);
};

////////////////////////////////////////////////////////////////////////////////

#endif /* nsJAR_h_ */