content/renderer/pepper/host_array_buffer_var.cc

   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 WebKit::WebArrayBuffer;
  22
  23 namespace content {
  24
  25 HostArrayBufferVar::HostArrayBufferVar(uint32 size_in_bytes)
  26     : buffer_(WebArrayBuffer::create(size_in_bytes, 1 /* element_size */)),
  27       valid_(true) {
  28 }
  29
  30 HostArrayBufferVar::HostArrayBufferVar(const WebArrayBuffer& buffer)
  31     : buffer_(buffer),
  32       valid_(true) {
  33 }
  34
  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
  46 HostArrayBufferVar::~HostArrayBufferVar() {
  47 }
  48
  49 void* HostArrayBufferVar::Map() {
  50   if (!valid_)
  51     return NULL;
  52   return buffer_.data();
  53 }
  54
  55 void HostArrayBufferVar::Unmap() {
  56   // We do not used shared memory on the host side. Nothing to do.
  57 }
  58
  59 uint32 HostArrayBufferVar::ByteLength() {
  60   return buffer_.byteLength();
  61 }
  62
  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