GN: Build app snapshots for the SDK tools.

runtime/bin/file_win.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
 #include "bin/file.h"
 
 #include <fcntl.h>  // NOLINT
@@ skipping 57 matching lines @@
   return handle_->fd();
 }
 
 
 bool File::IsClosed() {
   return handle_->fd() == kClosedFd;
 }
 
 
 void* File::Map(MapType type, int64_t position, int64_t length) {
-  UNIMPLEMENTED();
-  return NULL;
+  ASSERT(handle_->fd() >= 0);
+  int flags;
+  switch (type) {
+    case kReadOnly:
+      flags = PAGE_READONLY;
+      break;
+    case KReadExecute:
+      flags = PAGE_EXECUTE_READ:
+      break;
+    default:
+      return NULL;
+  }
+  HANDLE mapping = CreateFileMapping(handle_->fd(), NULL, flags, 0, 0, NULL);
+  return MapViewOfFile(mapping,
+                       FILE_MAP_READ,
+                       Utils::High32Bits(position),
+                       Utils::Low32Bits(position),
+                       length);
 }
 
 
 int64_t File::Read(void* buffer, int64_t num_bytes) {
   ASSERT(handle_->fd() >= 0);
   return read(handle_->fd(), buffer, num_bytes);
 }
 
 
 int64_t File::Write(const void* buffer, int64_t num_bytes) {
@@ skipping 610 matching lines @@
     return kIdentical;
   } else {
     return kDifferent;
   }
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_WINDOWS)