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content / renderer / pepper / host_array_buffer_var.cc [blame]
// 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 "content/renderer/pepper/host_array_buffer_var.h"
#include <stdio.h>
#include <string.h>
#include <memory>
#include "base/memory/shared_memory_mapping.h"
#include "base/memory/unsafe_shared_memory_region.h"
#include "base/process/process_handle.h"
#include "content/common/pepper_file_util.h"
#include "content/renderer/pepper/host_globals.h"
#include "content/renderer/pepper/plugin_module.h"
#include "content/renderer/pepper/renderer_ppapi_host_impl.h"
#include "ppapi/c/pp_instance.h"
using ppapi::ArrayBufferVar;
using blink::WebArrayBuffer;
namespace content {
HostArrayBufferVar::HostArrayBufferVar(uint32_t size_in_bytes)
: buffer_(WebArrayBuffer::Create(size_in_bytes, 1 /* element_size */)),
valid_(true) {}
HostArrayBufferVar::HostArrayBufferVar(const WebArrayBuffer& buffer)
: buffer_(buffer), valid_(true) {}
HostArrayBufferVar::HostArrayBufferVar(
uint32_t size_in_bytes,
const base::UnsafeSharedMemoryRegion& region)
: buffer_(WebArrayBuffer::Create(size_in_bytes, 1 /* element_size */)) {
base::WritableSharedMemoryMapping shm_mapping =
region.MapAt(0, size_in_bytes);
if (shm_mapping.IsValid()) {
memcpy(buffer_.Data(), shm_mapping.memory(), size_in_bytes);
}
}
HostArrayBufferVar::~HostArrayBufferVar() {}
void* HostArrayBufferVar::Map() {
if (!valid_)
return nullptr;
return buffer_.Data();
}
void HostArrayBufferVar::Unmap() {
// We do not used shared memory on the host side. Nothing to do.
}
uint32_t HostArrayBufferVar::ByteLength() {
return base::checked_cast<uint32_t>(buffer_.ByteLength());
}
bool HostArrayBufferVar::CopyToNewShmem(
PP_Instance instance,
int* host_shm_handle_id,
base::UnsafeSharedMemoryRegion* plugin_shm_region) {
base::UnsafeSharedMemoryRegion shm =
base::UnsafeSharedMemoryRegion::Create(ByteLength());
if (!shm.IsValid())
return false;
base::WritableSharedMemoryMapping shm_mapping = shm.MapAt(0, ByteLength());
if (!shm_mapping.IsValid())
return false;
memcpy(shm_mapping.memory(), Map(), ByteLength());
// Duplicate the handle here; the UnsafeSharedMemoryRegion destructor closes
// its handle on us.
HostGlobals* hg = HostGlobals::Get();
PluginModule* pm = hg->GetModule(hg->GetModuleForInstance(instance));
*plugin_shm_region =
pm->renderer_ppapi_host()->ShareUnsafeSharedMemoryRegionWithRemote(shm);
*host_shm_handle_id = -1;
return true;
}
} // namespace content