The Tor Browser / file comparison
comparison: ipc/chromium/src/chrome/common/transport_dib_win.cc
ipc/chromium/src/chrome/common/transport_dib_win.cc
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- 6474c204b198
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| -1:000000000000 | 0:eac58d441a40 |
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| 1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include <limits> | |
| 6 #include <windows.h> | |
| 7 | |
| 8 #include "base/logging.h" | |
| 9 #include "base/sys_info.h" | |
| 10 #include "chrome/common/transport_dib.h" | |
| 11 | |
| 12 TransportDIB::TransportDIB() { | |
| 13 } | |
| 14 | |
| 15 TransportDIB::~TransportDIB() { | |
| 16 } | |
| 17 | |
| 18 TransportDIB::TransportDIB(HANDLE handle) | |
| 19 : shared_memory_(handle, false /* read write */) { | |
| 20 } | |
| 21 | |
| 22 // static | |
| 23 TransportDIB* TransportDIB::Create(size_t size, uint32_t sequence_num) { | |
| 24 size_t allocation_granularity = base::SysInfo::VMAllocationGranularity(); | |
| 25 size = size / allocation_granularity + 1; | |
| 26 size = size * allocation_granularity; | |
| 27 | |
| 28 TransportDIB* dib = new TransportDIB; | |
| 29 | |
| 30 if (!dib->shared_memory_.Create("", false /* read write */, | |
| 31 true /* open existing */, size)) { | |
| 32 delete dib; | |
| 33 return NULL; | |
| 34 } | |
| 35 | |
| 36 dib->size_ = size; | |
| 37 dib->sequence_num_ = sequence_num; | |
| 38 | |
| 39 return dib; | |
| 40 } | |
| 41 | |
| 42 // static | |
| 43 TransportDIB* TransportDIB::Map(TransportDIB::Handle handle) { | |
| 44 TransportDIB* dib = new TransportDIB(handle); | |
| 45 if (!dib->shared_memory_.Map(0 /* map whole shared memory segment */)) { | |
| 46 CHROMIUM_LOG(ERROR) << "Failed to map transport DIB" | |
| 47 << " handle:" << handle | |
| 48 << " error:" << GetLastError(); | |
| 49 delete dib; | |
| 50 return NULL; | |
| 51 } | |
| 52 | |
| 53 // There doesn't seem to be any way to find the size of the shared memory | |
| 54 // region! GetFileSize indicates that the handle is invalid. Thus, we | |
| 55 // conservatively set the size to the maximum and hope that the renderer | |
| 56 // isn't about to ask us to read off the end of the array. | |
| 57 dib->size_ = std::numeric_limits<size_t>::max(); | |
| 58 | |
| 59 return dib; | |
| 60 } | |
| 61 | |
| 62 void* TransportDIB::memory() const { | |
| 63 return shared_memory_.memory(); | |
| 64 } | |
| 65 | |
| 66 TransportDIB::Handle TransportDIB::handle() const { | |
| 67 return shared_memory_.handle(); | |
| 68 } | |
| 69 | |
| 70 TransportDIB::Id TransportDIB::id() const { | |
| 71 return Id(shared_memory_.handle(), sequence_num_); | |
| 72 } |
