net: FileStream cleanup

base/files/file_unittest.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 "base/file_util.h"
 #include "base/files/file.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/time/time.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 407 matching lines @@
   EXPECT_EQ(first_chunk_size, file.WriteAtCurrentPos(kData, first_chunk_size));
   EXPECT_EQ(kDataSize - first_chunk_size,
             file.WriteAtCurrentPos(kData + first_chunk_size,
                                    kDataSize - first_chunk_size));
 
   char buffer[kDataSize];
   EXPECT_EQ(kDataSize, file.Read(0, buffer, kDataSize));
   EXPECT_EQ(std::string(buffer, buffer + kDataSize), std::string(kData));
 }
 
+TEST(FileTest, Seek) {
+  base::ScopedTempDir temp_dir;
+  ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
+  FilePath file_path = temp_dir.path().AppendASCII("seek_file");
+  File file(file_path,
+            base::File::FLAG_CREATE | base::File::FLAG_READ |
+                base::File::FLAG_WRITE);
+  ASSERT_TRUE(file.IsValid());
+
+  const int64 kOffset = 10;
+  EXPECT_EQ(kOffset, file.Seek(base::File::FROM_BEGIN, kOffset));
+  EXPECT_EQ(2 * kOffset, file.Seek(base::File::FROM_CURRENT, kOffset));
+  EXPECT_EQ(kOffset, file.Seek(base::File::FROM_CURRENT, -kOffset));
+  EXPECT_TRUE(file.SetLength(kOffset * 2));
+  EXPECT_EQ(kOffset, file.Seek(base::File::FROM_END, -kOffset));
+}
+
 #if defined(OS_WIN)
 TEST(FileTest, GetInfoForDirectory) {
   base::ScopedTempDir temp_dir;
   ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
   FilePath empty_dir = temp_dir.path().Append(FILE_PATH_LITERAL("gpfi_test"));
   ASSERT_TRUE(CreateDirectory(empty_dir));
 
   base::File dir(
       ::CreateFile(empty_dir.value().c_str(),
                    FILE_ALL_ACCESS,
                    FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
                    NULL,
                    OPEN_EXISTING,
                    FILE_FLAG_BACKUP_SEMANTICS,  // Needed to open a directory.
                    NULL));
   ASSERT_TRUE(dir.IsValid());
 
   base::File::Info info;
   EXPECT_TRUE(dir.GetInfo(&info));
   EXPECT_TRUE(info.is_directory);
   EXPECT_FALSE(info.is_symbolic_link);
   EXPECT_EQ(0, info.size);
 }
 #endif  // defined(OS_WIN)