net: Implement canceling of all async operations in FileStream.

base/platform_file_win.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/platform_file.h"
 
 #include "base/file_path.h"
 #include "base/logging.h"
 #include "base/threading/thread_restrictions.h"
 
@@ skipping 95 matching lines @@
   }
 
   return file;
 }
 
 bool ClosePlatformFile(PlatformFile file) {
   base::ThreadRestrictions::AssertIOAllowed();
   return (CloseHandle(file) != 0);
 }
 
+int64 SeekPlatformFile(PlatformFile file,
+                       PlatformFileWhence whence,
+                       int64 offset) {
+  base::ThreadRestrictions::AssertIOAllowed();
+  if (file < 0 || offset < 0)
+    return -1;
+
+  LARGE_INTEGER distance, res;
+  distance.QuadPart = offset;
+  DWORD move_method = static_cast<DWORD>(whence);
+  if (!SetFilePointerEx(file_, distance, &res, move_method))
+    return -1;
+  return res.QuadPart;
+}
+
 int ReadPlatformFile(PlatformFile file, int64 offset, 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;
@@ skipping 10 matching lines @@
 
 int ReadPlatformFileAtCurrentPos(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 ReadPlatformFileCurPosNoBestEffort(PlatformFile file,
+                                       char* data, int size) {
+  return ReadPlatformFile(file, 0, 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 WritePlatformFileAtCurrentPos(PlatformFile file, const char* data,
                                   int size) {
   return WritePlatformFile(file, 0, data, size);
 }
 
+int WritePlatformFileCurPosNoBestEffort(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