Index: chrome/common/transport_dib_win.cc |
diff --git a/chrome/common/transport_dib_win.cc b/chrome/common/transport_dib_win.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..e9ab424d6b693f8d93df675418d97ac63134d1c3 |
--- /dev/null |
+++ b/chrome/common/transport_dib_win.cc |
@@ -0,0 +1,72 @@ |
+// Copyright (c) 2009 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 <limits> |
+#include <windows.h> |
+ |
+#include "base/logging.h" |
+#include "base/sys_info.h" |
+#include "chrome/common/transport_dib.h" |
+ |
+TransportDIB::TransportDIB() { |
+} |
+ |
+TransportDIB::~TransportDIB() { |
+} |
+ |
+TransportDIB::TransportDIB(HANDLE handle) |
+ : shared_memory_(handle, false /* read write */) { |
+} |
+ |
+// static |
+TransportDIB* TransportDIB::Create(size_t size, uint32 sequence_num) { |
+ size_t allocation_granularity = base::SysInfo::VMAllocationGranularity(); |
+ size = size / allocation_granularity + 1; |
+ size = size * allocation_granularity; |
+ |
+ TransportDIB* dib = new TransportDIB; |
+ |
+ if (!dib->shared_memory_.Create(L"", false /* read write */, |
+ true /* open existing */, size)) { |
+ delete dib; |
+ return NULL; |
+ } |
+ |
+ dib->size_ = size; |
+ dib->sequence_num_ = sequence_num; |
+ |
+ return dib; |
+} |
+ |
+// static |
+TransportDIB* TransportDIB::Map(TransportDIB::Handle handle) { |
+ TransportDIB* dib = new TransportDIB(handle); |
+ if (!dib->shared_memory_.Map(0 /* map whole shared memory segment */)) { |
+ DLOG(ERROR) << "Failed to map transport DIB" |
+ << " handle:" << handle |
+ << " error:" << GetLastError(); |
+ delete dib; |
+ return NULL; |
+ } |
+ |
+ // There doesn't seem to be any way to find the size of the shared memory |
+ // region! GetFileSize indicates that the handle is invalid. Thus, we |
+ // conservatively set the size to the maximum and hope that the renderer |
+ // isn't about to ask us to read off the end of the array. |
+ dib->size_ = std::numeric_limits<size_t>::max(); |
+ |
+ return dib; |
+} |
+ |
+void* TransportDIB::memory() const { |
+ return shared_memory_.memory(); |
+} |
+ |
+TransportDIB::Handle TransportDIB::handle() const { |
+ return shared_memory_.handle(); |
+} |
+ |
+TransportDIB::Id TransportDIB::id() const { |
+ return Id(shared_memory_.handle(), sequence_num_); |
+} |