modules/libjar/nsXPTZipLoader.cpp

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
   9  *
  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
  13  * License.
  14  *
  15  * The Original Code is the XPT zip reader.
  16  *
  17  * The Initial Developer of the Original Code is
  18  * Netscape Communications Corp.
  19  * Portions created by the Initial Developer are Copyright (C) 2002
  20  * the Initial Developer. All Rights Reserved.
  21  *
  22  * Contributor(s):
  23  *   John Bandhauer <jband@netscape.com>
  24  *   Alec Flett <alecf@netscape.com>
  25  *
  26  * Alternatively, the contents of this file may be used under the terms of
  27  * either the GNU General Public License Version 2 or later (the "GPL"), or
  28  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  29  * in which case the provisions of the GPL or the LGPL are applicable instead
  30  * of those above. If you wish to allow use of your version of this file only
  31  * under the terms of either the GPL or the LGPL, and not to allow others to
  32  * use your version of this file under the terms of the MPL, indicate your
  33  * decision by deleting the provisions above and replace them with the notice
  34  * and other provisions required by the GPL or the LGPL. If you do not delete
  35  * the provisions above, a recipient may use your version of this file under
  36  * the terms of any one of the MPL, the GPL or the LGPL.
  37  *
  38  * ***** END LICENSE BLOCK ***** */
  39
  40
  41 #include "nsXPTZipLoader.h"
  42 #include "nsIZipReader.h"
  43 #include "nsXPIDLString.h"
  44 #include "nsString.h"
  45 #include "nsStringEnumerator.h"
  46
  47 static const char gCacheContractID[] =
  48   "@mozilla.org/libjar/zip-reader-cache;1";
  49 static const PRUint32 gCacheSize = 1;
  50
  51 nsXPTZipLoader::nsXPTZipLoader() {
  52 }
  53
  54 NS_IMPL_ISUPPORTS1(nsXPTZipLoader, nsIXPTLoader)
  55
  56 nsresult
  57 nsXPTZipLoader::LoadEntry(nsILocalFile* aFile,
  58                           const char* aName,
  59                           nsIInputStream** aResult)
  60 {
  61     nsCOMPtr<nsIZipReader> zip = dont_AddRef(GetZipReader(aFile));
  62
  63     if (!zip)
  64         return NS_OK;
  65
  66     return zip->GetInputStream(aName, aResult);
  67 }
  68
  69 nsresult
  70 nsXPTZipLoader::EnumerateEntries(nsILocalFile* aFile,
  71                                  nsIXPTLoaderSink* aSink)
  72 {
  73     nsCOMPtr<nsIZipReader> zip = dont_AddRef(GetZipReader(aFile));
  74
  75     if (!zip) {
  76         NS_WARNING("Could not get Zip Reader");
  77         return NS_OK;
  78     }
  79
  80     nsCOMPtr<nsIUTF8StringEnumerator> entries;
  81     if (NS_FAILED(zip->FindEntries("*.xpt", getter_AddRefs(entries))) ||
  82         !entries) {
  83         // no problem, just no .xpt files in this archive
  84         return NS_OK;
  85     }
  86
  87     PRBool hasMore;
  88     int index = 0;
  89     while (NS_SUCCEEDED(entries->HasMore(&hasMore)) && hasMore) {
  90         nsCAutoString itemName;
  91         if (NS_FAILED(entries->GetNext(itemName)))
  92             return NS_ERROR_UNEXPECTED;
  93
  94         nsCOMPtr<nsIInputStream> stream;
  95         if (NS_FAILED(zip->GetInputStream(itemName.get(), getter_AddRefs(stream))))
  96             return NS_ERROR_FAILURE;
  97
  98         // ignore the result
  99         aSink->FoundEntry(itemName.get(), index++, stream);
 100     }
 101
 102     return NS_OK;
 103 }
 104
 105 nsIZipReader*
 106 nsXPTZipLoader::GetZipReader(nsILocalFile* file)
 107 {
 108     NS_ASSERTION(file, "bad file");
 109
 110     if(!mCache)
 111     {
 112         mCache = do_CreateInstance(gCacheContractID);
 113         if(!mCache || NS_FAILED(mCache->Init(gCacheSize)))
 114             return nsnull;
 115     }
 116
 117     nsIZipReader* reader = nsnull;
 118
 119     if(NS_FAILED(mCache->GetZip(file, &reader)))
 120         return nsnull;
 121
 122     return reader;
 123 }