gecko/modules/libjar/nsZipArchive.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code, released
* March 31, 1998.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998-1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Daniel Veditz <dveditz@netscape.com>
* Samir Gehani <sgehani@netscape.com>
* Mitch Stoltz <mstoltz@netscape.com>
* Taras Glek <tglek@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsZipArchive_h_
#define nsZipArchive_h_
#define ZIP_TABSIZE 256
#define ZIP_BUFLEN (4*1024) /* Used as output buffer when deflating items to a file */
#define PL_ARENA_CONST_ALIGN_MASK (sizeof(void*)-1)
#include "plarena.h"
#include "zlib.h"
#include "zipstruct.h"
#include "nsAutoPtr.h"
#include "nsILocalFile.h"
class nsZipFind;
struct PRFileDesc;
/**
* This file defines some of the basic structures used by libjar to
* read Zip files. It makes use of zlib in order to do the decompression.
*
* A few notes on the classes/structs:
* nsZipArchive represents a single Zip file, and maintains an index
* of all the items in the file.
* nsZipItem represents a single item (file) in the Zip archive.
* nsZipFind represents the metadata involved in doing a search,
* and current state of the iteration of found objects.
* 'MT''safe' reading from the zipfile is performed through JARInputStream,
* which maintains its own file descriptor, allowing for multiple reads
* concurrently from the same zip file.
*/
/**
* nsZipItem -- a helper struct for nsZipArchive
*
* each nsZipItem represents one file in the archive and all the
* information needed to manipulate it.
*/
class nsZipItem
{
public:
const char* Name() { return ((const char*)central) + ZIPCENTRAL_SIZE; }
PRUint32 LocalOffset();
PRUint32 Size();
PRUint32 RealSize();
PRUint32 CRC32();
PRUint16 Date();
PRUint16 Time();
PRUint16 Compression();
bool IsDirectory();
PRUint16 Mode();
const PRUint8* GetExtraField(PRUint16 aTag, PRUint16 *aBlockSize);
PRTime LastModTime();
#if defined(XP_UNIX) || defined(XP_BEOS)
bool IsSymlink();
#endif
nsZipItem* next;
const ZipCentral* central;
PRUint16 nameLength;
bool isSynthetic;
};
class nsZipHandle;
/**
* nsZipArchive -- a class for reading the PKZIP file format.
*
*/
class nsZipArchive
{
friend class nsZipFind;
public:
/** constructing does not open the archive. See OpenArchive() */
nsZipArchive();
/** destructing the object closes the archive */
~nsZipArchive();
/**
* OpenArchive
*
* It's an error to call this more than once on the same nsZipArchive
* object. If we were allowed to use exceptions this would have been
* part of the constructor
*
* @param fd File descriptor of file to open
* @return status code
*/
nsresult OpenArchive(nsIFile *aZipFile);
/**
* Test the integrity of items in this archive by running
* a CRC check after extracting each item into a memory
* buffer. If an entry name is supplied only the
* specified item is tested. Else, if null is supplied
* then all the items in the archive are tested.
*
* @return status code
*/
nsresult Test(const char *aEntryName);
/**
* Closes an open archive.
*/
nsresult CloseArchive();
/**
* GetItem
* @param aEntryName Name of file in the archive
* @return pointer to nsZipItem
*/
nsZipItem* GetItem(const char * aEntryName);
/**
* ExtractFile
*
* @param zipEntry Name of file in archive to extract
* @param outFD Filedescriptor to write contents to
* @param outname Name of file to write to
* @return status code
*/
nsresult ExtractFile(nsZipItem * zipEntry, const char *outname, PRFileDesc * outFD);
/**
* FindInit
*
* Initializes a search for files in the archive. FindNext() returns
* the actual matches. The nsZipFind must be deleted when you're done
*
* @param aPattern a string or RegExp pattern to search for
* (may be NULL to find all files in archive)
* @param aFind a pointer to a pointer to a structure used
* in FindNext. In the case of an error this
* will be set to NULL.
* @return status code
*/
PRInt32 FindInit(const char * aPattern, nsZipFind** aFind);
/*
* Gets an undependent handle to the mapped file.
*/
nsZipHandle* GetFD();
/**
* Get pointer to the data of the item.
* @param aItem Pointer to nsZipItem
* reutrns null when zip file is corrupt.
*/
PRUint8* GetData(nsZipItem* aItem);
private:
//--- private members ---
nsZipItem* mFiles[ZIP_TABSIZE];
PLArenaPool mArena;
// Whether we synthesized the directory entries
bool mBuiltSynthetics;
// file handle
nsRefPtr<nsZipHandle> mFd;
//--- private methods ---
nsZipArchive& operator=(const nsZipArchive& rhs); // prevent assignments
nsZipArchive(const nsZipArchive& rhs); // prevent copies
nsZipItem* CreateZipItem();
nsresult BuildFileList();
nsresult BuildSynthetics();
nsresult CopyItemToDisk(nsZipItem* item, PRFileDesc* outFD);
nsresult InflateItem(nsZipItem* item, PRFileDesc* outFD);
};
class nsZipHandle {
friend class nsZipArchive;
public:
static nsresult Init(PRFileDesc *fd, nsZipHandle **ret NS_OUTPARAM);
NS_METHOD_(nsrefcnt) AddRef(void);
NS_METHOD_(nsrefcnt) Release(void);
protected:
PRUint8 * mFileData; /* pointer to mmaped file */
PRUint32 mLen; /* length of file and memory mapped area */
private:
nsZipHandle();
~nsZipHandle();
PRFileMap * mMap; /* nspr datastructure for mmap */
nsrefcnt mRefCnt; /* ref count */
};
/**
* nsZipFind
*
* a helper class for nsZipArchive, representing a search
*/
class nsZipFind
{
public:
nsZipFind(nsZipArchive* aZip, char* aPattern, PRBool regExp);
~nsZipFind();
nsresult FindNext(const char** aResult, PRUint16* aNameLen);
private:
nsZipArchive* mArchive;
char* mPattern;
nsZipItem* mItem;
PRUint16 mSlot;
PRPackedBool mRegExp;
//-- prevent copies and assignments
nsZipFind& operator=(const nsZipFind& rhs);
nsZipFind(const nsZipFind& rhs);
};
nsresult gZlibInit(z_stream *zs);
#endif /* nsZipArchive_h_ */