Reduce missing evt file spam in pdfium_test.

samples/pdfium_test.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include <map>
 #include <sstream>
 #include <string>
 #include <utility>
 #include <vector>
 
 #if defined PDF_ENABLE_SKIA && !defined _SKIA_SUPPORT_
 #define _SKIA_SUPPORT_
 #endif
 
 #include "public/fpdf_dataavail.h"
 #include "public/fpdf_edit.h"
 #include "public/fpdf_ext.h"
 #include "public/fpdf_formfill.h"
 #include "public/fpdf_text.h"
 #include "public/fpdfview.h"
 #include "samples/image_diff_png.h"
 #include "testing/test_support.h"
 
+#ifdef _WIN32
+#include <io.h>
+#else
+#include <unistd.h>
+#endif
+
 #ifdef PDF_ENABLE_V8
 #include "v8/include/libplatform/libplatform.h"
 #include "v8/include/v8.h"
 #endif  // PDF_ENABLE_V8
 
-#ifdef _WIN32
-#define snprintf _snprintf
-#endif
-
 #ifdef PDF_ENABLE_SKIA
 #include "third_party/skia/include/core/SkPictureRecorder.h"
 #include "third_party/skia/include/core/SkStream.h"
 #endif
 
+#ifdef _WIN32
+#define access _access
+#define snprintf _snprintf
+#define R_OK 4
+#endif
+
 enum OutputFormat {
   OUTPUT_NONE,
   OUTPUT_TEXT,
   OUTPUT_PPM,
   OUTPUT_PNG,
 #ifdef _WIN32
   OUTPUT_BMP,
   OUTPUT_EMF,
 #endif
 #ifdef PDF_ENABLE_SKIA
@@ skipping 845 matching lines @@
     if (!file_contents)
       continue;
     fprintf(stderr, "Rendering PDF file %s.\n", filename.c_str());
     std::string events;
     if (options.send_events) {
       std::string event_filename = filename;
       size_t event_length = 0;
       size_t extension_pos = event_filename.find(".pdf");
       if (extension_pos != std::string::npos) {
         event_filename.replace(extension_pos, 4, ".evt");
-        std::unique_ptr<char, pdfium::FreeDeleter> event_contents =
-            GetFileContents(event_filename.c_str(), &event_length);
-        if (event_contents) {
-          fprintf(stderr, "Sending events from: %s\n", event_filename.c_str());
-          events = std::string(event_contents.get(), event_length);
+        if (access(event_filename.c_str(), R_OK) == 0) {
+          fprintf(stderr, "Using event file %s.\n", event_filename.c_str());
+          std::unique_ptr<char, pdfium::FreeDeleter> event_contents =
+              GetFileContents(event_filename.c_str(), &event_length);
+          if (event_contents) {
+            fprintf(stderr, "Sending events from: %s\n",
+                    event_filename.c_str());
+            events = std::string(event_contents.get(), event_length);
+          }
         }
       }
     }
     RenderPdf(filename, file_contents.get(), file_length, options, events);
   }
 
   FPDF_DestroyLibrary();
 #ifdef PDF_ENABLE_V8
   v8::V8::ShutdownPlatform();
   delete platform;
 
 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
   free(const_cast<char*>(natives.data));
   free(const_cast<char*>(snapshot.data));
 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
 #endif  // PDF_ENABLE_V8
 
   return 0;
 }