1 // Copyright (c) 2012 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 "content/renderer/pepper/host_array_buffer_var.h"
6
7 #include <stdio.h>
8 #include <string.h>
9
10 #include "base/logging.h"
11 #include "base/memory/scoped_ptr.h"
12 #include "base/memory/shared_memory.h"
13 #include "base/process/process_handle.h"
14 #include "content/common/sandbox_util.h"
15 #include "content/renderer/pepper/host_globals.h"
16 #include "content/renderer/pepper/plugin_module.h"
17 #include "content/renderer/render_thread_impl.h"
18 #include "ppapi/c/pp_instance.h"
19
20 using ppapi::ArrayBufferVar;
21 using blink::WebArrayBuffer;
22
23 namespace content {
24
HostArrayBufferVar(uint32 size_in_bytes)25 HostArrayBufferVar::HostArrayBufferVar(uint32 size_in_bytes)
26 : buffer_(WebArrayBuffer::create(size_in_bytes, 1 /* element_size */)),
27 valid_(true) {}
28
HostArrayBufferVar(const WebArrayBuffer & buffer)29 HostArrayBufferVar::HostArrayBufferVar(const WebArrayBuffer& buffer)
30 : buffer_(buffer), valid_(true) {}
31
HostArrayBufferVar(uint32 size_in_bytes,base::SharedMemoryHandle handle)32 HostArrayBufferVar::HostArrayBufferVar(uint32 size_in_bytes,
33 base::SharedMemoryHandle handle)
34 : buffer_(WebArrayBuffer::create(size_in_bytes, 1 /* element_size */)) {
35 base::SharedMemory s(handle, true);
36 valid_ = s.Map(size_in_bytes);
37 if (valid_) {
38 memcpy(buffer_.data(), s.memory(), size_in_bytes);
39 s.Unmap();
40 }
41 }
42
~HostArrayBufferVar()43 HostArrayBufferVar::~HostArrayBufferVar() {}
44
Map()45 void* HostArrayBufferVar::Map() {
46 if (!valid_)
47 return NULL;
48 return buffer_.data();
49 }
50
Unmap()51 void HostArrayBufferVar::Unmap() {
52 // We do not used shared memory on the host side. Nothing to do.
53 }
54
ByteLength()55 uint32 HostArrayBufferVar::ByteLength() { return buffer_.byteLength(); }
56
CopyToNewShmem(PP_Instance instance,int * host_shm_handle_id,base::SharedMemoryHandle * plugin_shm_handle)57 bool HostArrayBufferVar::CopyToNewShmem(
58 PP_Instance instance,
59 int* host_shm_handle_id,
60 base::SharedMemoryHandle* plugin_shm_handle) {
61 scoped_ptr<base::SharedMemory> shm(
62 RenderThread::Get()
63 ->HostAllocateSharedMemoryBuffer(ByteLength())
64 .release());
65 if (!shm)
66 return false;
67
68 shm->Map(ByteLength());
69 memcpy(shm->memory(), Map(), ByteLength());
70 shm->Unmap();
71
72 // Duplicate the handle here; the SharedMemory destructor closes
73 // its handle on us.
74 HostGlobals* hg = HostGlobals::Get();
75 PluginModule* pm = hg->GetModule(hg->GetModuleForInstance(instance));
76 base::ProcessId p = pm->GetPeerProcessId();
77 if (p == base::kNullProcessId) {
78 // In-process, clone for ourselves.
79 p = base::GetCurrentProcId();
80 }
81
82 base::PlatformFile platform_file =
83 #if defined(OS_WIN)
84 shm->handle();
85 #elif defined(OS_POSIX)
86 shm->handle().fd;
87 #else
88 #error Not implemented.
89 #endif
90
91 *plugin_shm_handle = BrokerGetFileHandleForProcess(platform_file, p, false);
92 *host_shm_handle_id = -1;
93 return true;
94 }
95
96 } // namespace content
97