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      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 
     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
    102