Implement serial API for Windows.

base/platform_file_win.cc

 // Copyright (c) 2011 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/platform_file.h"
 
 #include "base/file_path.h"
 #include "base/logging.h"
 #include "base/threading/thread_restrictions.h"
 
@@ skipping 116 matching lines @@
 
   DWORD bytes_read;
   if (::ReadFile(file, data, size, &bytes_read, &overlapped) != 0)
     return bytes_read;
   else if (ERROR_HANDLE_EOF == GetLastError())
     return 0;
 
   return -1;
 }
 
-int ReadPlatformFileNoBestEffort(PlatformFile file, int64 offset,
-                                 char* data, int size) {
+int ReadPlatformFileFromCurrentPos(PlatformFile file, char* data, int size) {
+  return ReadPlatformFile(file, 0, data, size);
+}
+
+int ReadPlatformFileNoBestEffort(PlatformFile file, int64 offset, char* data,
+                                 int size) {
   return ReadPlatformFile(file, offset, data, size);
 }
 
 int WritePlatformFile(PlatformFile file, int64 offset,
                       const char* data, int size) {
   base::ThreadRestrictions::AssertIOAllowed();
   if (file == kInvalidPlatformFileValue)
     return -1;
 
   LARGE_INTEGER offset_li;
   offset_li.QuadPart = offset;
 
   OVERLAPPED overlapped = {0};
   overlapped.Offset = offset_li.LowPart;
   overlapped.OffsetHigh = offset_li.HighPart;
 
   DWORD bytes_written;
   if (::WriteFile(file, data, size, &bytes_written, &overlapped) != 0)
     return bytes_written;
 
   return -1;
 }
 
+int WritePlatformFileFromCurrentPos(PlatformFile file, const char* data,
+                                    int size) {
+  return WritePlatformFile(file, 0, data, size);
+}
+
 bool TruncatePlatformFile(PlatformFile file, int64 length) {
   base::ThreadRestrictions::AssertIOAllowed();
   if (file == kInvalidPlatformFileValue)
     return false;
 
   // Get the current file pointer.
   LARGE_INTEGER file_pointer;
   LARGE_INTEGER zero;
   zero.QuadPart = 0;
   if (::SetFilePointerEx(file, zero, &file_pointer, FILE_CURRENT) == 0)
@@ skipping 46 matching lines @@
   info->is_directory =
       (file_info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0;
   info->is_symbolic_link = false; // Windows doesn't have symbolic links.
   info->last_modified = base::Time::FromFileTime(file_info.ftLastWriteTime);
   info->last_accessed = base::Time::FromFileTime(file_info.ftLastAccessTime);
   info->creation_time = base::Time::FromFileTime(file_info.ftCreationTime);
   return true;
 }
 
 }  // namespace base