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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ppapi/proxy/plugin_array_buffer_var.h"
#include <stdlib.h>
#include <limits>
#include "ppapi/c/dev/ppb_buffer_dev.h"
#include "ppapi/proxy/plugin_dispatcher.h"
#include "ppapi/proxy/plugin_globals.h"
#include "ppapi/proxy/ppapi_messages.h"
#include "ppapi/proxy/serialized_structs.h"
#include "ppapi/shared_impl/host_resource.h"
#include "ppapi/shared_impl/resource.h"
#include "ppapi/thunk/enter.h"
#include "ppapi/thunk/ppb_buffer_api.h"
using ppapi::proxy::PluginGlobals;
using ppapi::proxy::PluginResourceTracker;
namespace ppapi {
PluginArrayBufferVar::PluginArrayBufferVar(uint32_t size_in_bytes)
: buffer_(size_in_bytes),
size_in_bytes_(size_in_bytes) {}
PluginArrayBufferVar::PluginArrayBufferVar(
uint32_t size_in_bytes,
base::UnsafeSharedMemoryRegion plugin_handle)
: plugin_handle_(std::move(plugin_handle)), size_in_bytes_(size_in_bytes) {}
PluginArrayBufferVar::~PluginArrayBufferVar() = default;
void* PluginArrayBufferVar::Map() {
if (shmem_.IsValid())
return shmem_.memory();
if (plugin_handle_.IsValid()) {
shmem_ = plugin_handle_.MapAt(0, size_in_bytes_);
if (!shmem_.IsValid()) {
return nullptr;
}
return shmem_.memory();
}
if (buffer_.empty())
return nullptr;
return &(buffer_[0]);
}
void PluginArrayBufferVar::Unmap() {
shmem_ = base::WritableSharedMemoryMapping();
}
uint32_t PluginArrayBufferVar::ByteLength() {
return size_in_bytes_;
}
bool PluginArrayBufferVar::CopyToNewShmem(
PP_Instance instance,
int* host_handle_id,
base::UnsafeSharedMemoryRegion* plugin_out_handle) {
ppapi::proxy::PluginDispatcher* dispatcher =
ppapi::proxy::PluginDispatcher::GetForInstance(instance);
if (!dispatcher)
return false;
ppapi::proxy::SerializedHandle plugin_handle;
dispatcher->Send(new PpapiHostMsg_SharedMemory_CreateSharedMemory(
instance, ByteLength(), host_handle_id, &plugin_handle));
if (!plugin_handle.IsHandleValid() || !plugin_handle.is_shmem_region() ||
*host_handle_id == -1)
return false;
base::UnsafeSharedMemoryRegion tmp_handle =
base::UnsafeSharedMemoryRegion::Deserialize(
plugin_handle.TakeSharedMemoryRegion());
base::WritableSharedMemoryMapping s = tmp_handle.MapAt(0, ByteLength());
if (!s.IsValid())
return false;
memcpy(s.memory(), Map(), ByteLength());
// We don't need to keep the shared memory around on the plugin side;
// we've already copied all our data into it. We'll make it invalid
// just to be safe.
*plugin_out_handle = base::UnsafeSharedMemoryRegion();
return true;
}
} // namespace ppapi
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