tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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nsDownloader.cpp (2926B)

      1 /* This Source Code Form is subject to the terms of the Mozilla Public
      2 * License, v. 2.0. If a copy of the MPL was not distributed with this
      3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      4 
      5 #include "nsDownloader.h"
      6 #include "nsIInputStream.h"
      7 #include "nsIOutputStream.h"
      8 #include "nsDirectoryServiceUtils.h"
      9 #include "nsDirectoryServiceDefs.h"
     10 #include "nsNetUtil.h"
     11 #include "nsCRTGlue.h"
     12 
     13 nsDownloader::~nsDownloader() {
     14  if (mLocation && mLocationIsTemp) {
     15    // release the sink first since it may still hold an open file
     16    // descriptor to mLocation.  this needs to happen before the
     17    // file can be removed otherwise the Remove call will fail.
     18    if (mSink) {
     19      mSink->Close();
     20      mSink = nullptr;
     21    }
     22 
     23    nsresult rv = mLocation->Remove(false);
     24    if (NS_FAILED(rv)) NS_ERROR("unable to remove temp file");
     25  }
     26 }
     27 
     28 NS_IMPL_ISUPPORTS(nsDownloader, nsIDownloader, nsIStreamListener,
     29                  nsIRequestObserver)
     30 
     31 NS_IMETHODIMP
     32 nsDownloader::Init(nsIDownloadObserver* observer, nsIFile* location) {
     33  mObserver = observer;
     34  mLocation = location;
     35  return NS_OK;
     36 }
     37 
     38 NS_IMETHODIMP
     39 nsDownloader::OnStartRequest(nsIRequest* request) {
     40  nsresult rv;
     41  if (!mLocation) {
     42    nsCOMPtr<nsIFile> location;
     43    rv = NS_GetSpecialDirectory(NS_OS_TEMP_DIR, getter_AddRefs(location));
     44    if (NS_FAILED(rv)) return rv;
     45 
     46    char buf[13];
     47    NS_MakeRandomString(buf, 8);
     48    memcpy(buf + 8, ".tmp", 5);
     49    rv = location->AppendNative(nsDependentCString(buf, 12));
     50    if (NS_FAILED(rv)) return rv;
     51 
     52    rv = location->CreateUnique(nsIFile::NORMAL_FILE_TYPE, 0600);
     53    if (NS_FAILED(rv)) return rv;
     54 
     55    location.swap(mLocation);
     56    mLocationIsTemp = true;
     57  }
     58 
     59  rv = NS_NewLocalFileOutputStream(getter_AddRefs(mSink), mLocation);
     60  if (NS_FAILED(rv)) return rv;
     61 
     62  // we could wrap this output stream with a buffered output stream,
     63  // but it shouldn't be necessary since we will be writing large
     64  // chunks given to us via OnDataAvailable.
     65 
     66  return NS_OK;
     67 }
     68 
     69 NS_IMETHODIMP
     70 nsDownloader::OnStopRequest(nsIRequest* request, nsresult status) {
     71  if (mSink) {
     72    mSink->Close();
     73    mSink = nullptr;
     74  }
     75 
     76  mObserver->OnDownloadComplete(this, request, status, mLocation);
     77  mObserver = nullptr;
     78 
     79  return NS_OK;
     80 }
     81 
     82 nsresult nsDownloader::ConsumeData(nsIInputStream* in, void* closure,
     83                                   const char* fromRawSegment,
     84                                   uint32_t toOffset, uint32_t count,
     85                                   uint32_t* writeCount) {
     86  nsDownloader* self = (nsDownloader*)closure;
     87  if (self->mSink) return self->mSink->Write(fromRawSegment, count, writeCount);
     88 
     89  *writeCount = count;
     90  return NS_OK;
     91 }
     92 
     93 NS_IMETHODIMP
     94 nsDownloader::OnDataAvailable(nsIRequest* request, nsIInputStream* inStr,
     95                              uint64_t sourceOffset, uint32_t count) {
     96  uint32_t n;
     97  return inStr->ReadSegments(ConsumeData, this, count, &n);
     98 }