ppapi/proxy/plugin_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 "ppapi/proxy/plugin_array_buffer_var.h"
   6
   7 #include <stdlib.h>
   8
   9 #include <limits>
  10
  11 #include "base/memory/shared_memory.h"
  12 #include "ppapi/c/dev/ppb_buffer_dev.h"
  13 #include "ppapi/proxy/plugin_dispatcher.h"
  14 #include "ppapi/proxy/plugin_globals.h"
  15 #include "ppapi/proxy/ppapi_messages.h"
  16 #include "ppapi/proxy/serialized_structs.h"
  17 #include "ppapi/shared_impl/host_resource.h"
  18 #include "ppapi/shared_impl/resource.h"
  19 #include "ppapi/thunk/enter.h"
  20 #include "ppapi/thunk/ppb_buffer_api.h"
  21
  22 using base::SharedMemory;
  23 using base::SharedMemoryHandle;
  24 using ppapi::proxy::PluginGlobals;
  25 using ppapi::proxy::PluginResourceTracker;
  26
  27 namespace ppapi {
  28
  29 PluginArrayBufferVar::PluginArrayBufferVar(uint32 size_in_bytes)
  30     : buffer_(size_in_bytes),
  31       plugin_handle_(base::SharedMemory::NULLHandle()),
  32       size_in_bytes_(size_in_bytes) {
  33 }
  34
  35 PluginArrayBufferVar::PluginArrayBufferVar(uint32 size_in_bytes,
  36                                            SharedMemoryHandle plugin_handle)
  37     : plugin_handle_(plugin_handle),
  38       size_in_bytes_(size_in_bytes) {
  39 }
  40
  41 PluginArrayBufferVar::~PluginArrayBufferVar() {
  42   Unmap();
  43
  44   if (shmem_.get() == NULL) {
  45     // The SharedMemory destuctor can't close the handle for us.
  46     if (SharedMemory::IsHandleValid(plugin_handle_))
  47       SharedMemory::CloseHandle(plugin_handle_);
  48   } else {
  49     // Delete SharedMemory, if we have one.
  50     shmem_.reset();
  51   }
  52 }
  53
  54 void* PluginArrayBufferVar::Map() {
  55   if (shmem_.get())
  56     return shmem_->memory();
  57   if (SharedMemory::IsHandleValid(plugin_handle_)) {
  58     shmem_.reset(new SharedMemory(plugin_handle_, false));
  59     if (!shmem_->Map(size_in_bytes_)) {
  60       shmem_.reset();
  61       return NULL;
  62     }
  63     return shmem_->memory();
  64   }
  65   if (buffer_.empty())
  66     return NULL;
  67   return &(buffer_[0]);
  68 }
  69
  70 void PluginArrayBufferVar::Unmap() {
  71   if (shmem_.get())
  72     shmem_->Unmap();
  73 }
  74
  75 uint32 PluginArrayBufferVar::ByteLength() {
  76   return size_in_bytes_;
  77 }
  78
  79 bool PluginArrayBufferVar::CopyToNewShmem(
  80     PP_Instance instance,
  81     int* host_handle_id,
  82     SharedMemoryHandle* plugin_out_handle) {
  83   ppapi::proxy::PluginDispatcher* dispatcher =
  84       ppapi::proxy::PluginDispatcher::GetForInstance(instance);
  85   if (!dispatcher)
  86     return false;
  87
  88   ppapi::proxy::SerializedHandle plugin_handle;
  89   dispatcher->Send(new PpapiHostMsg_SharedMemory_CreateSharedMemory(
  90       instance, ByteLength(), host_handle_id, &plugin_handle));
  91   if (!plugin_handle.IsHandleValid() || !plugin_handle.is_shmem() ||
  92       *host_handle_id == -1)
  93     return false;
  94
  95   base::SharedMemoryHandle tmp_handle = plugin_handle.shmem();
  96   SharedMemory s(tmp_handle, false);
  97   if (!s.Map(ByteLength()))
  98     return false;
  99   memcpy(s.memory(), Map(), ByteLength());
 100   s.Unmap();
 101
 102   // We don't need to keep the shared memory around on the plugin side;
 103   // we've already copied all our data into it. We'll make it invalid
 104   // just to be safe.
 105   *plugin_out_handle = base::SharedMemory::NULLHandle();
 106
 107   return true;
 108 }
 109
 110 }  // namespace ppapi