ipc/chromium/src/chrome/common/transport_dib_win.cc@deefc01c0e14 (annotated)
ipc/chromium/src/chrome/common/transport_dib_win.cc
Thu, 15 Jan 2015 21:03:48 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 15 Jan 2015 21:03:48 +0100
- branch
- TOR_BUG_9701
- changeset 11
- deefc01c0e14
- permissions
- -rw-r--r--
Integrate friendly tips from Tor colleagues to make (or not) 4.5 alpha 3;
This includes removal of overloaded (but unused) methods, and addition of
a overlooked call to DataStruct::SetData(nsISupports, uint32_t, bool.)
| michael@0 | 1 | // Copyright (c) 2009 The Chromium Authors. All rights reserved. |
| michael@0 | 2 | // Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 3 | // found in the LICENSE file. |
| michael@0 | 4 | |
| michael@0 | 5 | #include <limits> |
| michael@0 | 6 | #include <windows.h> |
| michael@0 | 7 | |
| michael@0 | 8 | #include "base/logging.h" |
| michael@0 | 9 | #include "base/sys_info.h" |
| michael@0 | 10 | #include "chrome/common/transport_dib.h" |
| michael@0 | 11 | |
| michael@0 | 12 | TransportDIB::TransportDIB() { |
| michael@0 | 13 | } |
| michael@0 | 14 | |
| michael@0 | 15 | TransportDIB::~TransportDIB() { |
| michael@0 | 16 | } |
| michael@0 | 17 | |
| michael@0 | 18 | TransportDIB::TransportDIB(HANDLE handle) |
| michael@0 | 19 | : shared_memory_(handle, false /* read write */) { |
| michael@0 | 20 | } |
| michael@0 | 21 | |
| michael@0 | 22 | // static |
| michael@0 | 23 | TransportDIB* TransportDIB::Create(size_t size, uint32_t sequence_num) { |
| michael@0 | 24 | size_t allocation_granularity = base::SysInfo::VMAllocationGranularity(); |
| michael@0 | 25 | size = size / allocation_granularity + 1; |
| michael@0 | 26 | size = size * allocation_granularity; |
| michael@0 | 27 | |
| michael@0 | 28 | TransportDIB* dib = new TransportDIB; |
| michael@0 | 29 | |
| michael@0 | 30 | if (!dib->shared_memory_.Create("", false /* read write */, |
| michael@0 | 31 | true /* open existing */, size)) { |
| michael@0 | 32 | delete dib; |
| michael@0 | 33 | return NULL; |
| michael@0 | 34 | } |
| michael@0 | 35 | |
| michael@0 | 36 | dib->size_ = size; |
| michael@0 | 37 | dib->sequence_num_ = sequence_num; |
| michael@0 | 38 | |
| michael@0 | 39 | return dib; |
| michael@0 | 40 | } |
| michael@0 | 41 | |
| michael@0 | 42 | // static |
| michael@0 | 43 | TransportDIB* TransportDIB::Map(TransportDIB::Handle handle) { |
| michael@0 | 44 | TransportDIB* dib = new TransportDIB(handle); |
| michael@0 | 45 | if (!dib->shared_memory_.Map(0 /* map whole shared memory segment */)) { |
| michael@0 | 46 | CHROMIUM_LOG(ERROR) << "Failed to map transport DIB" |
| michael@0 | 47 | << " handle:" << handle |
| michael@0 | 48 | << " error:" << GetLastError(); |
| michael@0 | 49 | delete dib; |
| michael@0 | 50 | return NULL; |
| michael@0 | 51 | } |
| michael@0 | 52 | |
| michael@0 | 53 | // There doesn't seem to be any way to find the size of the shared memory |
| michael@0 | 54 | // region! GetFileSize indicates that the handle is invalid. Thus, we |
| michael@0 | 55 | // conservatively set the size to the maximum and hope that the renderer |
| michael@0 | 56 | // isn't about to ask us to read off the end of the array. |
| michael@0 | 57 | dib->size_ = std::numeric_limits<size_t>::max(); |
| michael@0 | 58 | |
| michael@0 | 59 | return dib; |
| michael@0 | 60 | } |
| michael@0 | 61 | |
| michael@0 | 62 | void* TransportDIB::memory() const { |
| michael@0 | 63 | return shared_memory_.memory(); |
| michael@0 | 64 | } |
| michael@0 | 65 | |
| michael@0 | 66 | TransportDIB::Handle TransportDIB::handle() const { |
| michael@0 | 67 | return shared_memory_.handle(); |
| michael@0 | 68 | } |
| michael@0 | 69 | |
| michael@0 | 70 | TransportDIB::Id TransportDIB::id() const { |
| michael@0 | 71 | return Id(shared_memory_.handle(), sequence_num_); |
| michael@0 | 72 | } |
