Suppress MJPEG fprintf() runtime warning

source/mjpeg_decoder.cc

 /*
  *  Copyright 2012 The LibYuv 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
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS. All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 44 matching lines @@
 const int MJpegDecoder::kColorSpaceYCbCr = JCS_YCbCr;
 const int MJpegDecoder::kColorSpaceCMYK = JCS_CMYK;
 const int MJpegDecoder::kColorSpaceYCCK = JCS_YCCK;
 
 // Methods that are passed to jpeglib.
 boolean fill_input_buffer(jpeg_decompress_struct* cinfo);
 void init_source(jpeg_decompress_struct* cinfo);
 void skip_input_data(jpeg_decompress_struct* cinfo, long num_bytes);  // NOLINT
 void term_source(jpeg_decompress_struct* cinfo);
 void ErrorHandler(jpeg_common_struct* cinfo);
+void OutputHandler(jpeg_common_struct* cinfo);
 
 MJpegDecoder::MJpegDecoder()
     : has_scanline_padding_(LIBYUV_FALSE),
       num_outbufs_(0),
       scanlines_(NULL),
       scanlines_sizes_(NULL),
       databuf_(NULL),
       databuf_strides_(NULL) {
   decompress_struct_ = new jpeg_decompress_struct;
   source_mgr_ = new jpeg_source_mgr;
 #ifdef HAVE_SETJMP
   error_mgr_ = new SetJmpErrorMgr;
   decompress_struct_->err = jpeg_std_error(&error_mgr_->base);
   // Override standard exit()-based error handler.
   error_mgr_->base.error_exit = &ErrorHandler;
+  error_mgr_->base.output_message = &OutputHandler;
 #endif
   decompress_struct_->client_data = NULL;
   source_mgr_->init_source = &init_source;
   source_mgr_->fill_input_buffer = &fill_input_buffer;
   source_mgr_->skip_input_data = &skip_input_data;
   source_mgr_->resync_to_restart = &jpeg_resync_to_restart;
   source_mgr_->term_source = &term_source;
   jpeg_create_decompress(decompress_struct_);
   decompress_struct_->src = source_mgr_;
   buf_vec_.buffers = &buf_;
@@ skipping 359 matching lines @@
   char buf[JMSG_LENGTH_MAX];
   (*cinfo->err->format_message)(cinfo, buf);
   // ERROR: Error in jpeglib: buf
 #endif
 
   SetJmpErrorMgr* mgr = reinterpret_cast<SetJmpErrorMgr*>(cinfo->err);
   // This rewinds the call stack to the point of the corresponding setjmp()
   // and causes it to return (for a second time) with value 1.
   longjmp(mgr->setjmp_buffer, 1);
 }
-#endif
+
+void OutputHandler(j_common_ptr cinfo) {
+  // Suppress fprintf warnings.
+}
+
+#endif  // HAVE_SETJMP
 
 void MJpegDecoder::AllocOutputBuffers(int num_outbufs) {
   if (num_outbufs != num_outbufs_) {
     // We could perhaps optimize this case to resize the output buffers without
     // necessarily having to delete and recreate each one, but it's not worth
     // it.
     DestroyOutputBuffers();
 
     scanlines_ = new uint8** [num_outbufs];
     scanlines_sizes_ = new int[num_outbufs];
@@ skipping 91 matching lines @@
     if (subsample_x[0] == 1 && subsample_y[0] == 1) {
       return kJpegYuv400;
     }
   }
   return kJpegUnknown;
 }
 
 }  // namespace libyuv
 #endif  // HAVE_JPEG