Addressing C4267 warnings for printing.

printing/emf_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 "printing/emf_win.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 #include <memory>
 
 #include "base/files/file.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
+#include "base/numerics/safe_conversions.h"
 #include "base/win/scoped_gdi_object.h"
 #include "base/win/scoped_hdc.h"
 #include "base/win/scoped_select_object.h"
 #include "skia/ext/skia_utils_win.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/codec/jpeg_codec.h"
 #include "ui/gfx/codec/png_codec.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
 
@@ skipping 152 matching lines @@
   return !!emf_;
 }
 
 bool Emf::Init() {
   DCHECK(!emf_ && !hdc_);
   hdc_ = CreateEnhMetaFile(nullptr, nullptr, nullptr, nullptr);
   DCHECK(hdc_);
   return !!hdc_;
 }
 
-bool Emf::InitFromData(const void* src_buffer, uint32_t src_buffer_size) {
+bool Emf::InitFromData(const void* src_buffer, size_t src_buffer_size) {
   DCHECK(!emf_ && !hdc_);
-  emf_ = SetEnhMetaFileBits(src_buffer_size,
+  if (!base::IsValueInRangeForNumericType<UINT>(src_buffer_size))
+    return false;
+
+  emf_ = SetEnhMetaFileBits(static_cast<UINT>(src_buffer_size),
                             reinterpret_cast<const BYTE*>(src_buffer));
   return !!emf_;
 }
 
 bool Emf::FinishDocument() {
   DCHECK(!emf_ && hdc_);
   emf_ = CloseEnhMetaFile(hdc_);
   DCHECK(emf_);
   hdc_ = nullptr;
   return !!emf_;
@@ skipping 389 matching lines @@
 
   HDC bitmap_dc = bitmap.context();
   RECT rect = page_bounds.ToRECT();
   ::EnumEnhMetaFile(hdc, emf(), &RasterizeAlphaBlendProc, &bitmap_dc, &rect);
 
   result->FinishDocument();
   return result;
 }
 
 }  // namespace printing