Check return value of fwrite. [Video Module]

Description:
On ChromeOS/ARM, compiler enforces to check return result of a function.
Currently, we don't check return result of fwrite, it causes building errors.

The following files need to patch. The patch should be similar, before I patch all
of them, I will start with 3 files, once we agree upon the solution, we will expand
it to all of them.

The question is should we do 
1. if (error) { return -1;} 
or 
2. if (error) { /*ignor the error*/ }

I took "return -1" in this patch, but I'm OK with either. Please let me know your
thoughts and I will upload a new patch.
Review URL: https://webrtc-codereview.appspot.com/583010

git-svn-id: http://webrtc.googlecode.com/svn/trunk@2315 4adac7df-926f-26a2-2b94-8c16560cd09d

src/common_video/jpeg/jpeg_unittest.cc

@@ -114,7 +114,10 @@ TEST_F(JpegTest, Encode) {
 
   // Save decoded image to file.
   FILE* save_file = fopen(decoded_filename_.c_str(), "wb");
-  fwrite(image_buffer._buffer, 1, image_buffer._length, save_file);
+  if (fwrite(image_buffer._buffer, 1,
+             image_buffer._length, save_file) != image_buffer._length) {
+    return;
+  }
   fclose(save_file);
 
   delete[] image_buffer._buffer;

src/common_video/libyuv/libyuv_unittest.cc

@@ -127,7 +127,10 @@ TEST_F(TestLibYuv, ConvertTest) {
                              0, width_, height_, width_, kRotateNone,
                              res_i420_buffer));
 
-  fwrite(res_i420_buffer, frame_length_, 1, output_file);
+  if (fwrite(res_i420_buffer, 1, frame_length_,
+             output_file) != static_cast<unsigned int>(frame_length_)) {
+    return;
+  }
   psnr = I420PSNR(orig_buffer, res_i420_buffer, width_, height_);
   // Optimization Speed- quality trade-off => 45 dB only (platform dependant).
   EXPECT_GT(ceil(psnr), 44);
@@ -142,7 +145,10 @@ TEST_F(TestLibYuv, ConvertTest) {
             0, width_, height_, width_,kRotateNone, res_i420_buffer));
   psnr = I420PSNR(orig_buffer, res_i420_buffer, width_, height_);
   EXPECT_EQ(48.0, psnr);
-  fwrite(res_i420_buffer, frame_length_, 1, output_file);
+  if (fwrite(res_i420_buffer, 1, frame_length_,
+             output_file) !=  static_cast<unsigned int>(frame_length_)) {
+    return;
+  }
 
   j++;
   delete [] out_uyvy_buffer;
@@ -154,7 +160,10 @@ TEST_F(TestLibYuv, ConvertTest) {
                              kRotateNone, out_i420_buffer));
   EXPECT_EQ(0, ConvertFromI420(out_i420_buffer, width_, kI420, 0,
                                width_, height_, res_i420_buffer));
-  fwrite(res_i420_buffer, frame_length_, 1, output_file);
+  if (fwrite(res_i420_buffer, 1, frame_length_,
+             output_file) != static_cast<unsigned int>(frame_length_)) {
+    return;
+  }
   psnr = I420PSNR(orig_buffer, res_i420_buffer, width_, height_);
   EXPECT_EQ(48.0, psnr);
   j++;
@@ -169,7 +178,10 @@ TEST_F(TestLibYuv, ConvertTest) {
                                kI420, 0,
                                width_, height_,
                                res_i420_buffer));
-  fwrite(res_i420_buffer, frame_length_, 1, output_file);
+  if (fwrite(res_i420_buffer, 1, frame_length_,
+             output_file) !=  static_cast<unsigned int>(frame_length_)) {
+    return;
+  }
 
   psnr = I420PSNR(orig_buffer, res_i420_buffer, width_, height_);
   EXPECT_EQ(48.0, psnr);
@@ -185,7 +197,10 @@ TEST_F(TestLibYuv, ConvertTest) {
                              0, width_, height_, width_,
                              kRotateNone, res_i420_buffer));
 
-  fwrite(res_i420_buffer, frame_length_, 1, output_file);
+  if (fwrite(res_i420_buffer, 1, frame_length_,
+             output_file) !=  static_cast<unsigned int>(frame_length_)) {
+    return;
+  }
   psnr = I420PSNR(orig_buffer, res_i420_buffer, width_, height_);
   EXPECT_EQ(48.0, psnr);
 
@@ -198,7 +213,10 @@ TEST_F(TestLibYuv, ConvertTest) {
                              0, width_, height_, width_,
                              kRotateNone, res_i420_buffer));
 
-  fwrite(res_i420_buffer, frame_length_, 1, output_file);
+  if (fwrite(res_i420_buffer, 1, frame_length_,
+             output_file) !=  static_cast<unsigned int>(frame_length_)) {
+    return;
+  }
   psnr = I420PSNR(orig_buffer, res_i420_buffer, width_, height_);
   // TODO(leozwang) Investigate the right psnr should be set for I420ToRGB565,
   // Another example is I420ToRGB24, the psnr is 44
@@ -213,7 +231,10 @@ TEST_F(TestLibYuv, ConvertTest) {
                              0, width_, height_, width_,
                              kRotateNone, res_i420_buffer));
 
-  fwrite(res_i420_buffer, frame_length_, 1, output_file);
+  if (fwrite(res_i420_buffer, 1, frame_length_,
+             output_file) !=  static_cast<unsigned int>(frame_length_)) {
+    return;
+  }
   psnr = I420PSNR(orig_buffer, res_i420_buffer, width_, height_);
   // TODO(leozwang) Investigate the right psnr should be set for I420ToARGB8888,
   EXPECT_GT(ceil(psnr), 42);

src/common_video/libyuv/scaler_unittest.cc

@@ -1,5 +1,5 @@
 /*
- *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
@@ -221,7 +221,10 @@ void TestScaler::ScaleSequence(ScaleMethod method,
     EXPECT_EQ(0, test_scaler_.Scale(input_buffer, output_buffer,
                                    out_required_size));
     total_clock += TickTime::MillisecondTimestamp() - start_clock;
-    fwrite(output_buffer, out_required_size, 1, output_file);
+    if (fwrite(output_buffer, 1, out_required_size,
+               output_file) !=  static_cast<unsigned int>(out_required_size)) {
+      return;
+    }
     frame_count++;
   }
 

src/modules/video_coding/codecs/test_framework/normal_async_test.cc

@@ -246,7 +246,10 @@ VideoEncodeCompleteCallback::Encoded(EncodedImage& encodedImage,
     _test.CopyEncodedImage(*newBuffer, encodedImage, codecSpecificInfoCopy);
     if (_encodedFile != NULL)
     {
-        fwrite(newBuffer->GetBuffer(), 1, newBuffer->GetLength(), _encodedFile);
+      if (fwrite(newBuffer->GetBuffer(), 1, newBuffer->GetLength(),
+                 _encodedFile) !=  newBuffer->GetLength()) {
+        return -1;
+      }
     }
     _frameQueue->PushFrame(newBuffer, codecSpecificInfoCopy);
     return 0;
@@ -264,7 +267,10 @@ VideoDecodeCompleteCallback::Decoded(RawImage& image)
     _decodedBytes += image._length;
     if (_decodedFile != NULL)
     {
-        fwrite(image._buffer, 1, image._length, _decodedFile);
+      if (fwrite(image._buffer, 1, image._length,
+                 _decodedFile) !=  image._length) {
+        return -1;
+      }
     }
     return 0;
 }

src/modules/video_coding/codecs/test_framework/normal_test.cc

@@ -115,7 +115,7 @@ NormalTest::Perform()
     _inputVideoBuffer.VerifyAndAllocate(_lengthSourceFrame);
     _decodedVideoBuffer.VerifyAndAllocate(_lengthSourceFrame);
     _encodedVideoBuffer.VerifyAndAllocate(_lengthSourceFrame);
-    
+
     _encoder->InitEncode(&_inst, 1, 1460);
     CodecSpecific_InitBitrate();
     _decoder->InitDecode(&_inst,1);
@@ -129,14 +129,21 @@ NormalTest::Perform()
     {
         DoPacketLoss();
         _encodedVideoBuffer.UpdateLength(_encodedVideoBuffer.GetLength());
-        fwrite(_encodedVideoBuffer.GetBuffer(), 1, _encodedVideoBuffer.GetLength(), _encodedFile);
+        if (fwrite(_encodedVideoBuffer.GetBuffer(), 1,
+                   _encodedVideoBuffer.GetLength(),
+                   _encodedFile) !=  _encodedVideoBuffer.GetLength()) {
+          return;
+        }
         decodeLength = Decode();
         if (decodeLength < 0)
         {
             fprintf(stderr,"\n\nError in decoder: %d\n\n", decodeLength);
             exit(EXIT_FAILURE);
         }
-        fwrite(_decodedVideoBuffer.GetBuffer(), 1, decodeLength, _decodedFile);
+        if (fwrite(_decodedVideoBuffer.GetBuffer(), 1, decodeLength,
+                   _decodedFile) != static_cast<unsigned int>(decodeLength)) {
+          return;
+        }
         CodecSpecific_InitBitrate();
         _framecnt++;
     }
@@ -150,7 +157,10 @@ NormalTest::Perform()
             fprintf(stderr,"\n\nError in decoder: %d\n\n", decodeLength);
             exit(EXIT_FAILURE);
         }
-        fwrite(_decodedVideoBuffer.GetBuffer(), 1, decodeLength, _decodedFile);
+        if (fwrite(_decodedVideoBuffer.GetBuffer(), 1, decodeLength,
+                   _decodedFile) != static_cast<unsigned int>(decodeLength)) {
+          return;
+        }
     }
 
     double actualBitRate = ActualBitRate(_framecnt) / 1000.0;
@@ -250,4 +260,3 @@ NormalTest::Decode(int lossValue)
     _encodedVideoBuffer.UpdateLength(0);
     return lengthDecFrame;
 }
-

src/modules/video_coding/codecs/test_framework/packet_loss_test.cc

@@ -1,5 +1,5 @@
 /*
- *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
@@ -74,7 +74,10 @@ PacketLossTest::Decoded(const RawImage& decodedImage)
         // write previous decoded frame again (frame freeze)
         if (_decodedFile && _lastFrame)
         {
-            fwrite(_lastFrame, 1, _lastFrameLength, _decodedFile);
+          if (fwrite(_lastFrame, 1, _lastFrameLength,
+                     _decodedFile) != _lastFrameLength) {
+            return;
+          }
         }
 
         // remove frame from queue

src/modules/video_coding/codecs/test_framework/video_source.cc

@@ -240,8 +240,12 @@ VideoSource::Convert(const VideoSource &target, bool force /* = false */) const
         if (!fd.DropFrame())
         {
             ASSERT_TRUE(target.GetWidth() == _width &&
-                   target.GetHeight() == _height); // Add video interpolator here!
+                   target.GetHeight() == _height);
-            fwrite(outFrame, 1, lengthOutFrame, outFile);
+            // Add video interpolator here!
+            if (fwrite(outFrame, 1, lengthOutFrame,
+                       outFile) !=  lengthOutFrame) {
+              return;
+            }
         }
     }
 

src/modules/video_coding/main/source/video_coding_impl.cc

@@ -685,8 +685,10 @@ VideoCodingModuleImpl::AddVideoFrame(const VideoFrame& videoFrame,
 #ifdef DEBUG_ENCODER_INPUT
         if (_encoderInputFile != NULL)
         {
-            fwrite(videoFrame.Buffer(), 1, videoFrame.Length(),
+          if (fwrite(videoFrame.Buffer(), 1, videoFrame.Length(),
-                   _encoderInputFile);
+                     _encoderInputFile) !=  videoFrame.Length()) {
+            return -1;
+          }
         }
 #endif
         if (ret < 0)
@@ -898,9 +900,11 @@ VideoCodingModuleImpl::Decode(WebRtc_UWord16 maxWaitTimeMs)
 #ifdef DEBUG_DECODER_BIT_STREAM
         if (_bitStreamBeforeDecoder != NULL)
         {
-            // Write bit stream to file for debugging purposes
+          // Write bit stream to file for debugging purposes
-            fwrite(frame->Buffer(), 1, frame->Length(),
+          if (fwrite(frame->Buffer(), 1, frame->Length(),
-                   _bitStreamBeforeDecoder);
+                     _bitStreamBeforeDecoder) !=  frame->Length()) {
+            return -1;
+          }
         }
 #endif
         if (_frameStorageCallback != NULL)

src/modules/video_coding/main/test/media_opt_test.cc

@@ -330,8 +330,11 @@ MediaOptTest::Perform()
         }
         else
         {
-            // write frame to file
+          // write frame to file
-            fwrite(sourceFrame.Buffer(), 1, sourceFrame.Length(), _actualSourceFile);
+          if (fwrite(sourceFrame.Buffer(), 1, sourceFrame.Length(),
+                     _actualSourceFile) !=  sourceFrame.Length()) {
+            return -1;
+          }
         }
 
         _sumEncBytes += encBytes;

src/modules/video_coding/main/test/normal_test.cc

@@ -1,5 +1,5 @@
 /*
- *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
@@ -85,7 +85,9 @@ VCMNTEncodeCompleteCallback::SendData(
     // will call the VCMReceiver input packet
     _frameType = frameType;
     // writing encodedData into file
-    fwrite(payloadData, 1, payloadSize, _encodedFile);
+    if (fwrite(payloadData, 1, payloadSize, _encodedFile) !=  payloadSize) {
+      return -1;
+    }
     WebRtcRTPHeader rtpInfo;
     rtpInfo.header.markerBit = true;
     rtpInfo.type.Video.width = 0;
@@ -163,7 +165,10 @@ VCMNTDecodeCompleCallback::FrameToRender(webrtc::VideoFrame& videoFrame)
         }
         _decodedFile = fopen(_outname.c_str(), "wb");
     }
-    fwrite(videoFrame.Buffer(), 1, videoFrame.Length(), _decodedFile);
+    if (fwrite(videoFrame.Buffer(), 1, videoFrame.Length(),
+               _decodedFile) !=  videoFrame.Length()) {
+      return -1;
+    }
     _decodedBytes+= videoFrame.Length();
     return VCM_OK;
 }
@@ -396,7 +401,3 @@ NormalTest::Teardown()
     fclose(_encodedFile);
     return;
 }
-
-
-
-

src/modules/video_coding/main/test/quality_modes_test.cc

@@ -1,5 +1,5 @@
 /*
- *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
@@ -419,9 +419,12 @@ VCMQMDecodeCompleCallback::FrameToRender(VideoFrame& videoFrame)
 {
     if ((_origWidth == videoFrame.Width()) && (_origHeight == videoFrame.Height()))
     {
-        fwrite(videoFrame.Buffer(), 1, videoFrame.Length(), _decodedFile);
+      if (fwrite(videoFrame.Buffer(), 1, videoFrame.Length(),
-        _frameCnt++;
+                 _decodedFile) !=  videoFrame.Length()) {
-        //printf("frame dec # %d", _frameCnt);
+        return -1;
+      }
+      _frameCnt++;
+      //printf("frame dec # %d", _frameCnt);
         // no need for interpolator and decBuffer
         if (_decBuffer != NULL)
         {
@@ -446,7 +449,10 @@ VCMQMDecodeCompleCallback::FrameToRender(VideoFrame& videoFrame)
         }
 
 //        interpolateFrame(_interpolator, videoFrame.Buffer(),_decBuffer);
-        fwrite(_decBuffer, 1, _origWidth*_origHeight*3/2, _decodedFile);
+        if (fwrite(_decBuffer, 1, _origWidth*_origHeight * 3/2,
+                   _decodedFile) !=  _origWidth*_origHeight * 3/2) {
+          return -1;
+        }
         _frameCnt++;
     }
 

src/modules/video_coding/main/test/test_callbacks.cc

@@ -59,7 +59,9 @@ VCMEncodeCompleteCallback::SendData(
     // will call the VCMReceiver input packet
     _frameType = frameType;
     // writing encodedData into file
-    fwrite(payloadData, 1, payloadSize, _encodedFile);
+    if (fwrite(payloadData, 1, payloadSize, _encodedFile) !=  payloadSize) {
+      return -1;
+    }
     WebRtcRTPHeader rtpInfo;
     rtpInfo.header.markerBit = true; // end of frame
     rtpInfo.type.Video.isFirstPacket = true;
@@ -184,9 +186,12 @@ VCMRTPEncodeCompleteCallback::EncodeComplete()
 WebRtc_Word32
 VCMDecodeCompleteCallback::FrameToRender(VideoFrame& videoFrame)
 {
-    fwrite(videoFrame.Buffer(), 1, videoFrame.Length(), _decodedFile);
+  if (fwrite(videoFrame.Buffer(), 1, videoFrame.Length(),
-    _decodedBytes+= videoFrame.Length();
+             _decodedFile) !=  videoFrame.Length()) {
-    return VCM_OK;
+    return -1;
+  }
+  _decodedBytes+= videoFrame.Length();
+  return VCM_OK;
  }
 
 WebRtc_Word32

src/modules/video_coding/main/test/video_rtp_play.cc

@@ -66,7 +66,10 @@ FrameReceiveCallback::FrameToRender(VideoFrame& videoFrame)
     fprintf(_timingFile, "%u, %u\n",
             videoFrame.TimeStamp(),
             MaskWord64ToUWord32(videoFrame.RenderTimeMs()));
-    fwrite(videoFrame.Buffer(), 1, videoFrame.Length(), _outFile);
+    if (fwrite(videoFrame.Buffer(), 1, videoFrame.Length(),
+               _outFile) !=  videoFrame.Length()) {
+      return -1;
+    }
     return 0;
 }
 

src/modules/video_processing/main/test/unit_test/color_enhancement_test.cc

@@ -1,5 +1,5 @@
 /*
- *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
@@ -36,7 +36,7 @@ TEST_F(VideoProcessingModuleTest, ColorEnhancement)
         "foremanColorEnhancedVPM_cif_short.yuv";
     FILE* modFile = fopen(output_file.c_str(), "w+b");
     ASSERT_TRUE(modFile != NULL) << "Could not open output file.\n";
-        
+
     WebRtc_UWord32 frameNum = 0;
     while (fread(_videoFrame.Buffer(), 1, _frameLength, _sourceFile) == _frameLength)
     {
@@ -45,11 +45,14 @@ TEST_F(VideoProcessingModuleTest, ColorEnhancement)
         ASSERT_EQ(0, VideoProcessingModule::ColorEnhancement(_videoFrame));
         t1 = TickTime::Now();
         accTicks += t1 - t0;
-        fwrite(_videoFrame.Buffer(), 1, _frameLength, modFile);
+        if (fwrite(_videoFrame.Buffer(), 1, _frameLength,
+                   modFile) !=  _frameLength) {
+          return;
+        }
     }
     ASSERT_NE(0, feof(_sourceFile)) << "Error reading source file";
 
-    printf("\nTime per frame: %d us \n", 
+    printf("\nTime per frame: %d us \n",
         static_cast<int>(accTicks.Microseconds() / frameNum));
     rewind(modFile);
 
@@ -71,7 +74,7 @@ TEST_F(VideoProcessingModuleTest, ColorEnhancement)
     ASSERT_NE(-1L, testLen);
     rewind(modFile);
     ASSERT_EQ(refLen, testLen) << "File lengths differ.";
-	
+
     VideoFrame refVideoFrame;
     refVideoFrame.VerifyAndAllocate(_frameLength);
     refVideoFrame.SetWidth(_width);

src/modules/video_processing/main/test/unit_test/deflickering_test.cc

@@ -1,5 +1,5 @@
 /*
- *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
@@ -55,16 +55,19 @@ TEST_F(VideoProcessingModuleTest, Deflickering)
             frameNum++;
             _videoFrame.SetTimeStamp(timeStamp);
 
-            t0 = TickTime::Now();           
+            t0 = TickTime::Now();
             VideoProcessingModule::FrameStats stats;
             ASSERT_EQ(0, _vpm->GetFrameStats(stats, _videoFrame));
             ASSERT_EQ(0, _vpm->Deflickering(_videoFrame, stats));
             t1 = TickTime::Now();
             accTicks += t1 - t0;
-            
+
             if (runIdx == 0)
             {
-                fwrite(_videoFrame.Buffer(), 1, _frameLength, deflickerFile);
+              if (fwrite(_videoFrame.Buffer(), 1, _frameLength,
+                         deflickerFile) !=  _frameLength) {
+                return;
+              }
             }
             timeStamp += (90000 / frameRate);
         }
@@ -82,9 +85,9 @@ TEST_F(VideoProcessingModuleTest, Deflickering)
     ASSERT_EQ(0, fclose(deflickerFile));
     // TODO(kjellander): Add verification of deflicker output file.
 
-    printf("\nAverage run time = %d us / frame\n", 
+    printf("\nAverage run time = %d us / frame\n",
         static_cast<int>(avgRuntime / frameNum / NumRuns));
-    printf("Min run time = %d us / frame\n\n", 
+    printf("Min run time = %d us / frame\n\n",
         static_cast<int>(minRuntime / frameNum));
 }
 

src/modules/video_processing/main/test/unit_test/denoising_test.cc

@@ -1,5 +1,5 @@
 /*
- *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
@@ -92,17 +92,23 @@ TEST_F(VideoProcessingModuleTest, Denoising)
 
             if (runIdx == 0)
             {
-                fwrite(_videoFrame.Buffer(), 1, _frameLength, noiseFile);
+              if (fwrite(_videoFrame.Buffer(), 1, _frameLength,
+                         noiseFile) !=  _frameLength) {
+                return;
+              }
             }
-            
+
-            t0 = TickTime::Now();            
+            t0 = TickTime::Now();
             ASSERT_GE(modifiedPixels = _vpm->Denoising(_videoFrame), 0);
             t1 = TickTime::Now();
             accTicks += t1 - t0;
-            
+
             if (runIdx == 0)
             {
-                fwrite(_videoFrame.Buffer(), 1, _frameLength, denoiseFile);
+              if (fwrite(_videoFrame.Buffer(), 1, _frameLength,
+                         denoiseFile) !=  _frameLength) {
+                return;
+              }
             }
         }
         ASSERT_NE(0, feof(_sourceFile)) << "Error reading source file";
@@ -118,9 +124,9 @@ TEST_F(VideoProcessingModuleTest, Denoising)
     }
     ASSERT_EQ(0, fclose(denoiseFile));
     ASSERT_EQ(0, fclose(noiseFile));
-    printf("\nAverage run time = %d us / frame\n", 
+    printf("\nAverage run time = %d us / frame\n",
         static_cast<int>(avgRuntime / frameNum / NumRuns));
-    printf("Min run time = %d us / frame\n\n", 
+    printf("Min run time = %d us / frame\n\n",
         static_cast<int>(minRuntime / frameNum));
 }
 

src/modules/video_processing/main/test/unit_test/unit_test.cc

@@ -1,5 +1,5 @@
 /*
- *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
@@ -334,7 +334,10 @@ void TestSize(VideoFrame& sourceFrame, WebRtc_UWord32 targetWidth,
       targetHeight != sourceFrame.Height())  {
     ASSERT_EQ((targetWidth * targetHeight * 3 / 2), outFrame->Length());
     // Write to file for visual inspection
-    fwrite(outFrame->Buffer(), 1, outFrame->Length(), standAloneFile);
+    if (fwrite(outFrame->Buffer(), 1,
+               outFrame->Length(), standAloneFile) != outFrame->Length()) {
+      return;
+    }
     outFrame->Free();
   }
   fclose(standAloneFile);