Pepper: Add append support to FileIO.

ppapi/tests/test_file_io.cc

 // Copyright (c) 2012 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 "ppapi/tests/test_file_io.h"
 
 #include <errno.h>
 #include <fcntl.h>
+#include <stdio.h>
 #include <string.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 
 #include <vector>
 
 #include "ppapi/c/dev/ppb_testing_dev.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/ppb_file_io.h"
 #include "ppapi/c/private/pp_file_handle.h"
@@ skipping 388 matching lines @@
   ASSERT_EQ(PP_OK, rv);
   ASSERT_EQ(std::string("testtesttest\0\0\0\0", 16), read_buffer);
 
   // Read from the middle of the file.
   read_buffer.clear();
   rv = ReadEntireFile(instance_->pp_instance(), &file_io, 4, &read_buffer,
                       callback_type());
   ASSERT_EQ(PP_OK, rv);
   ASSERT_EQ(std::string("testtest\0\0\0\0", 12), read_buffer);
 
+  // Append to the end of the file.
+  pp::FileIO file_io2(instance_);
+  callback.WaitForResult(file_io2.Open(file_ref,
+                                       PP_FILEOPENFLAG_CREATE |
+                                       PP_FILEOPENFLAG_READ |
+                                       PP_FILEOPENFLAG_APPEND,
+                                       callback.GetCallback()));
+  rv = WriteEntireBuffer(instance_->pp_instance(), &file_io2, 0, "appended",
+                         callback_type());
+  ASSERT_EQ(PP_OK, rv);
+  read_buffer.clear();
+  rv = ReadEntireFile(instance_->pp_instance(), &file_io2, 0, &read_buffer,
+                      callback_type());
+  ASSERT_EQ(PP_OK, rv);
+  ASSERT_EQ(std::string("testtesttest\0\0\0\0appended", 24), read_buffer);
+
   PASS();
 }
 
 // This is basically a copy of TestReadWriteSetLength, but with the new Read
 // API.  With this test case, we can make sure the two Read's have the same
 // behavior.
 std::string TestFileIO::TestReadToArrayWriteSetLength() {
   if (callback_type() == PP_BLOCKING) {
     // This test does not make sense for blocking callbacks.
     PASS();
@@ skipping 961 matching lines @@
   if ((invalid_combination && callback.result() == PP_OK) ||
       (!invalid_combination &&
        ((callback.result() == PP_OK) != create_if_doesnt_exist))) {
     return ReportOpenError(open_flags);
   }
 
   return std::string();
 }
 
 // TODO(viettrungluu): Test Close(). crbug.com/69457