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 }
29
HostArrayBufferVar(const WebArrayBuffer & buffer)30 HostArrayBufferVar::HostArrayBufferVar(const WebArrayBuffer& buffer)
31 : buffer_(buffer),
32 valid_(true) {
33 }
34
HostArrayBufferVar(uint32 size_in_bytes,base::SharedMemoryHandle handle)35 HostArrayBufferVar::HostArrayBufferVar(uint32 size_in_bytes,
36 base::SharedMemoryHandle handle)
37 : buffer_(WebArrayBuffer::create(size_in_bytes, 1 /* element_size */)) {
38 base::SharedMemory s(handle, true);
39 valid_ = s.Map(size_in_bytes);
40 if (valid_) {
41 memcpy(buffer_.data(), s.memory(), size_in_bytes);
42 s.Unmap();
43 }
44 }
45
~HostArrayBufferVar()46 HostArrayBufferVar::~HostArrayBufferVar() {
47 }
48
Map()49 void* HostArrayBufferVar::Map() {
50 if (!valid_)
51 return NULL;
52 return buffer_.data();
53 }
54
Unmap()55 void HostArrayBufferVar::Unmap() {
56 // We do not used shared memory on the host side. Nothing to do.
57 }
58
ByteLength()59 uint32 HostArrayBufferVar::ByteLength() {
60 return buffer_.byteLength();
61 }
62
CopyToNewShmem(PP_Instance instance,int * host_shm_handle_id,base::SharedMemoryHandle * plugin_shm_handle)63 bool HostArrayBufferVar::CopyToNewShmem(
64 PP_Instance instance,
65 int* host_shm_handle_id,
66 base::SharedMemoryHandle* plugin_shm_handle) {
67 scoped_ptr<base::SharedMemory> shm(
68 RenderThread::Get()->HostAllocateSharedMemoryBuffer(ByteLength()).
69 release());
70 if (!shm)
71 return false;
72
73 shm->Map(ByteLength());
74 memcpy(shm->memory(), Map(), ByteLength());
75 shm->Unmap();
76
77 // Duplicate the handle here; the SharedMemory destructor closes
78 // its handle on us.
79 HostGlobals* hg = HostGlobals::Get();
80 PluginModule* pm = hg->GetModule(hg->GetModuleForInstance(instance));
81 base::ProcessId p = pm->GetPeerProcessId();
82 if (p == base::kNullProcessId) {
83 // In-process, clone for ourselves.
84 p = base::GetCurrentProcId();
85 }
86
87 base::PlatformFile platform_file =
88 #if defined(OS_WIN)
89 shm->handle();
90 #elif defined(OS_POSIX)
91 shm->handle().fd;
92 #else
93 #error Not implemented.
94 #endif
95
96 *plugin_shm_handle = BrokerGetFileHandleForProcess(platform_file, p, false);
97 *host_shm_handle_id = -1;
98 return true;
99 }
100
101 } // namespace content
102