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