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 blink::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 HostArrayBufferVar::HostArrayBufferVar(const WebArrayBuffer& buffer)
  30     : buffer_(buffer), valid_(true) {}
  31
  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
  43 HostArrayBufferVar::~HostArrayBufferVar() {}
  44
  45 void* HostArrayBufferVar::Map() {
  46   if (!valid_)
  47     return NULL;
  48   return buffer_.data();
  49 }
  50
  51 void HostArrayBufferVar::Unmap() {
  52   // We do not used shared memory on the host side. Nothing to do.
  53 }
  54
  55 uint32 HostArrayBufferVar::ByteLength() { return buffer_.byteLength(); }
  56
  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