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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 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
     97