Only support seeking file streams from the beginning of the file.

net/base/file_stream_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 "net/base/file_stream.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/files/file.h"
 #include "base/files/file_util.h"
@@ skipping 102 matching lines @@
   // 1. Test reading with a file handle.
   ASSERT_EQ(kTestDataSize,
             base::WriteFile(temp_file_path(), kTestData, kTestDataSize));
   int flags = base::File::FLAG_OPEN_ALWAYS | base::File::FLAG_READ |
               base::File::FLAG_ASYNC;
   base::File file(temp_file_path(), flags);
 
   // Seek to the beginning of the file and read.
   scoped_ptr<FileStream> read_stream(
       new FileStream(file.Pass(), base::MessageLoopProxy::current()));
-  ASSERT_EQ(ERR_IO_PENDING,
-            read_stream->Seek(base::File::FROM_BEGIN, 0,
-                              callback64.callback()));
+  ASSERT_EQ(ERR_IO_PENDING, read_stream->Seek(0, callback64.callback()));
   ASSERT_EQ(0, callback64.WaitForResult());
   // Read into buffer and compare.
   scoped_refptr<IOBufferWithSize> read_buffer =
       new IOBufferWithSize(kTestDataSize);
   rv = read_stream->Read(read_buffer.get(), kTestDataSize, callback.callback());
   ASSERT_EQ(kTestDataSize, callback.GetResult(rv));
   ASSERT_EQ(0, memcmp(kTestData, read_buffer->data(), kTestDataSize));
   read_stream.reset();
 
   // 2. Test writing with a file handle.
   base::DeleteFile(temp_file_path(), false);
   flags = base::File::FLAG_OPEN_ALWAYS | base::File::FLAG_WRITE |
           base::File::FLAG_ASYNC;
   file.Initialize(temp_file_path(), flags);
 
   scoped_ptr<FileStream> write_stream(
       new FileStream(file.Pass(), base::MessageLoopProxy::current()));
-  ASSERT_EQ(ERR_IO_PENDING,
-            write_stream->Seek(base::File::FROM_BEGIN, 0,
-                               callback64.callback()));
+  ASSERT_EQ(ERR_IO_PENDING, write_stream->Seek(0, callback64.callback()));
   ASSERT_EQ(0, callback64.WaitForResult());
   scoped_refptr<IOBufferWithSize> write_buffer = CreateTestDataBuffer();
   rv = write_stream->Write(write_buffer.get(), kTestDataSize,
                            callback.callback());
   ASSERT_EQ(kTestDataSize, callback.GetResult(rv));
   write_stream.reset();
 
   // Read into buffer and compare to make sure the handle worked fine.
   ASSERT_EQ(kTestDataSize,
             base::ReadFile(temp_file_path(), read_buffer->data(),
                            kTestDataSize));
   ASSERT_EQ(0, memcmp(kTestData, read_buffer->data(), kTestDataSize));
 }
 
 TEST_F(FileStreamTest, UseClosedStream) {
   int rv = 0;
   TestCompletionCallback callback;
   TestInt64CompletionCallback callback64;
 
   FileStream stream(base::MessageLoopProxy::current());
 
   EXPECT_FALSE(stream.IsOpen());
 
   // Try seeking...
-  rv = stream.Seek(base::File::FROM_BEGIN, 5, callback64.callback());
+  rv = stream.Seek(5, callback64.callback());
   EXPECT_EQ(ERR_UNEXPECTED, callback64.GetResult(rv));
 
   // Try reading...
   scoped_refptr<IOBufferWithSize> buf = new IOBufferWithSize(10);
   rv = stream.Read(buf.get(), buf->size(), callback.callback());
   EXPECT_EQ(ERR_UNEXPECTED, callback.GetResult(rv));
 }
 
 TEST_F(FileStreamTest, Read) {
   int64 file_size;
@@ skipping 56 matching lines @@
   FileStream stream(base::MessageLoopProxy::current());
   int flags = base::File::FLAG_OPEN | base::File::FLAG_READ |
               base::File::FLAG_ASYNC;
   TestCompletionCallback callback;
   int rv = stream.Open(temp_file_path(), flags, callback.callback());
   EXPECT_EQ(ERR_IO_PENDING, rv);
   EXPECT_EQ(OK, callback.WaitForResult());
 
   TestInt64CompletionCallback callback64;
   const int64 kOffset = 3;
-  rv = stream.Seek(base::File::FROM_BEGIN, kOffset, callback64.callback());
+  rv = stream.Seek(kOffset, callback64.callback());
   ASSERT_EQ(ERR_IO_PENDING, rv);
   int64 new_offset = callback64.WaitForResult();
   EXPECT_EQ(kOffset, new_offset);
 
   int total_bytes_read = 0;
 
   std::string data_read;
   for (;;) {
     scoped_refptr<IOBufferWithSize> buf = new IOBufferWithSize(4);
     rv = stream.Read(buf.get(), buf->size(), callback.callback());
     if (rv == ERR_IO_PENDING)
       rv = callback.WaitForResult();
     EXPECT_LE(0, rv);
     if (rv <= 0)
       break;
     total_bytes_read += rv;
     data_read.append(buf->data(), rv);
   }
   EXPECT_EQ(file_size - kOffset, total_bytes_read);
   EXPECT_EQ(kTestData + kOffset, data_read);
 }
 
-TEST_F(FileStreamTest, SeekAround) {
-  FileStream stream(base::MessageLoopProxy::current());
-  int flags = base::File::FLAG_OPEN | base::File::FLAG_ASYNC |
-              base::File::FLAG_READ;
-  TestCompletionCallback callback;
-  int rv = stream.Open(temp_file_path(), flags, callback.callback());
-  EXPECT_EQ(ERR_IO_PENDING, rv);
-  EXPECT_EQ(OK, callback.WaitForResult());
-
-  TestInt64CompletionCallback callback64;
-
-  const int64 kOffset = 3;
-  rv = stream.Seek(base::File::FROM_BEGIN, kOffset, callback64.callback());
-  ASSERT_EQ(ERR_IO_PENDING, rv);
-  int64 new_offset = callback64.WaitForResult();
-  EXPECT_EQ(kOffset, new_offset);
-
-  rv = stream.Seek(base::File::FROM_CURRENT, kOffset, callback64.callback());
-  ASSERT_EQ(ERR_IO_PENDING, rv);
-  new_offset = callback64.WaitForResult();
-  EXPECT_EQ(2 * kOffset, new_offset);
-
-  rv = stream.Seek(base::File::FROM_CURRENT, -kOffset, callback64.callback());
-  ASSERT_EQ(ERR_IO_PENDING, rv);
-  new_offset = callback64.WaitForResult();
-  EXPECT_EQ(kOffset, new_offset);
-
-  const int kTestDataLen = arraysize(kTestData) - 1;
-
-  rv = stream.Seek(base::File::FROM_END, -kTestDataLen, callback64.callback());
-  ASSERT_EQ(ERR_IO_PENDING, rv);
-  new_offset = callback64.WaitForResult();
-  EXPECT_EQ(0, new_offset);
-}
-
 TEST_F(FileStreamTest, Write) {
   FileStream stream(base::MessageLoopProxy::current());
   int flags = base::File::FLAG_CREATE_ALWAYS | base::File::FLAG_WRITE |
               base::File::FLAG_ASYNC;
   TestCompletionCallback callback;
   int rv = stream.Open(temp_file_path(), flags, callback.callback());
   EXPECT_EQ(OK, callback.GetResult(rv));
 
   int64 file_size;
   EXPECT_TRUE(base::GetFileSize(temp_file_path(), &file_size));
@@ skipping 46 matching lines @@
 
   FileStream stream(base::MessageLoopProxy::current());
   int flags = base::File::FLAG_OPEN | base::File::FLAG_WRITE |
               base::File::FLAG_ASYNC;
   TestCompletionCallback callback;
   int rv = stream.Open(temp_file_path(), flags, callback.callback());
   EXPECT_EQ(ERR_IO_PENDING, rv);
   EXPECT_EQ(OK, callback.WaitForResult());
 
   TestInt64CompletionCallback callback64;
-  const int64 kOffset = 0;
-  rv = stream.Seek(base::File::FROM_END, kOffset, callback64.callback());
+  const int64 kOffset = kTestDataSize;
+  rv = stream.Seek(kOffset, callback64.callback());
   ASSERT_EQ(ERR_IO_PENDING, rv);
   int64 new_offset = callback64.WaitForResult();
   EXPECT_EQ(kTestDataSize, new_offset);
 
   int total_bytes_written = 0;
 
   scoped_refptr<IOBufferWithSize> buf = CreateTestDataBuffer();
   scoped_refptr<DrainableIOBuffer> drainable =
       new DrainableIOBuffer(buf.get(), buf->size());
   while (total_bytes_written != kTestDataSize) {
@@ skipping 71 matching lines @@
   scoped_ptr<FileStream> stream(
       new FileStream(base::MessageLoopProxy::current()));
   int flags = base::File::FLAG_OPEN | base::File::FLAG_READ |
               base::File::FLAG_WRITE | base::File::FLAG_ASYNC;
   TestCompletionCallback callback;
   int rv = stream->Open(temp_file_path(), flags, callback.callback());
   EXPECT_EQ(ERR_IO_PENDING, rv);
   EXPECT_EQ(OK, callback.WaitForResult());
 
   TestInt64CompletionCallback callback64;
-  rv = stream->Seek(base::File::FROM_END, 0, callback64.callback());
+  rv = stream->Seek(file_size, callback64.callback());
   ASSERT_EQ(ERR_IO_PENDING, rv);
   int64 offset = callback64.WaitForResult();
   EXPECT_EQ(offset, file_size);
 
   int total_bytes_written = 0;
 
   scoped_refptr<IOBufferWithSize> buf = CreateTestDataBuffer();
   scoped_refptr<DrainableIOBuffer> drainable =
       new DrainableIOBuffer(buf.get(), buf->size());
   while (total_bytes_written != kTestDataSize) {
     rv = stream->Write(drainable.get(), drainable->BytesRemaining(),
                        callback.callback());
     if (rv == ERR_IO_PENDING)
       rv = callback.WaitForResult();
     EXPECT_LT(0, rv);
     if (rv <= 0)
       break;
     drainable->DidConsume(rv);
     total_bytes_written += rv;
   }
 
   EXPECT_EQ(kTestDataSize, total_bytes_written);
 
-  rv = stream->Seek(base::File::FROM_BEGIN, 0, callback64.callback());
+  rv = stream->Seek(0, callback64.callback());
   ASSERT_EQ(ERR_IO_PENDING, rv);
   offset = callback64.WaitForResult();
   EXPECT_EQ(0, offset);
 
   int total_bytes_read = 0;
 
   std::string data_read;
   for (;;) {
     scoped_refptr<IOBufferWithSize> buf = new IOBufferWithSize(4);
     rv = stream->Read(buf.get(), buf->size(), callback.callback());
@@ skipping 82 matching lines @@
       rv = stream_->Write(
           drainable_.get(), drainable_->BytesRemaining(), callback.callback());
       DCHECK_EQ(ERR_IO_PENDING, rv);
       rv = callback.WaitForResult();
       drainable_->DidConsume(total_bytes_written);
       *total_bytes_written_ += total_bytes_written;
       *total_bytes_read_ += total_bytes_read;
       *data_read_ += data_read;
     } else {  // We're done writing all data.  Start reading the data.
       TestInt64CompletionCallback callback64;
-      EXPECT_EQ(ERR_IO_PENDING,
-                stream_->Seek(base::File::FROM_BEGIN, 0,
-                              callback64.callback()));
+      EXPECT_EQ(ERR_IO_PENDING, stream_->Seek(0, callback64.callback()));
       {
         base::MessageLoop::ScopedNestableTaskAllower allow(
             base::MessageLoop::current());
         EXPECT_LE(0, callback64.WaitForResult());
       }
     }
 
     result_ = *total_bytes_written_;
     have_result_ = true;
     if (waiting_for_result_)
@@ skipping 21 matching lines @@
   scoped_ptr<FileStream> stream(
       new FileStream(base::MessageLoopProxy::current()));
   int flags = base::File::FLAG_OPEN | base::File::FLAG_READ |
               base::File::FLAG_WRITE | base::File::FLAG_ASYNC;
   TestCompletionCallback open_callback;
   int rv = stream->Open(temp_file_path(), flags, open_callback.callback());
   EXPECT_EQ(ERR_IO_PENDING, rv);
   EXPECT_EQ(OK, open_callback.WaitForResult());
 
   TestInt64CompletionCallback callback64;
-  EXPECT_EQ(ERR_IO_PENDING,
-            stream->Seek(base::File::FROM_END, 0, callback64.callback()));
+  EXPECT_EQ(ERR_IO_PENDING, stream->Seek(file_size, callback64.callback()));
   EXPECT_EQ(file_size, callback64.WaitForResult());
 
   int total_bytes_written = 0;
   int total_bytes_read = 0;
   std::string data_read;
   TestWriteReadCompletionCallback callback(stream.get(), &total_bytes_written,
                                            &total_bytes_read, &data_read);
 
   scoped_refptr<IOBufferWithSize> buf = CreateTestDataBuffer();
   rv = stream->Write(buf.get(), buf->size(), callback.callback());
@@ skipping 85 matching lines @@
   scoped_ptr<FileStream> stream(
       new FileStream(base::MessageLoopProxy::current()));
   int flags = base::File::FLAG_OPEN | base::File::FLAG_READ |
               base::File::FLAG_WRITE | base::File::FLAG_ASYNC;
   TestCompletionCallback open_callback;
   int rv = stream->Open(temp_file_path(), flags, open_callback.callback());
   EXPECT_EQ(ERR_IO_PENDING, rv);
   EXPECT_EQ(OK, open_callback.WaitForResult());
 
   TestInt64CompletionCallback callback64;
-  EXPECT_EQ(ERR_IO_PENDING,
-            stream->Seek(base::File::FROM_END, 0, callback64.callback()));
+  EXPECT_EQ(ERR_IO_PENDING, stream->Seek(file_size, callback64.callback()));
   EXPECT_EQ(file_size, callback64.WaitForResult());
 
   int total_bytes_written = 0;
   TestWriteCloseCompletionCallback callback(stream.get(), &total_bytes_written);
 
   scoped_refptr<IOBufferWithSize> buf = CreateTestDataBuffer();
   rv = stream->Write(buf.get(), buf->size(), callback.callback());
   if (rv == ERR_IO_PENDING)
     total_bytes_written = callback.WaitForResult();
   EXPECT_LT(0, total_bytes_written);
@@ skipping 125 matching lines @@
     total_bytes_read += rv;
     data_read.append(buf->data(), rv);
   }
   EXPECT_EQ(file_size, total_bytes_read);
 }
 #endif
 
 }  // namespace
 
 }  // namespace net