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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ppapi/proxy/file_mapping_resource.h"
#include "base/bind.h"
#include "base/numerics/safe_conversions.h"
#include "base/task_runner_util.h"
#include "ppapi/c/pp_errors.h"
#include "ppapi/shared_impl/tracked_callback.h"
#include "ppapi/shared_impl/var.h"
#include "ppapi/thunk/enter.h"
#include "ppapi/thunk/ppb_file_io_api.h"
namespace ppapi {
namespace proxy {
FileMappingResource::FileMappingResource(Connection connection,
PP_Instance instance)
: PluginResource(connection, instance) {
}
FileMappingResource::~FileMappingResource() {
}
thunk::PPB_FileMapping_API* FileMappingResource::AsPPB_FileMapping_API() {
return this;
}
int32_t FileMappingResource::Map(PP_Instance /* instance */,
PP_Resource file_io,
int64_t length,
uint32_t protection,
uint32_t flags,
int64_t offset,
void** address,
scoped_refptr<TrackedCallback> callback) {
thunk::EnterResourceNoLock<thunk::PPB_FileIO_API> enter(file_io, true);
if (enter.failed())
return PP_ERROR_BADARGUMENT;
FileIOResource* file_io_resource =
static_cast<FileIOResource*>(enter.object());
scoped_refptr<FileIOResource::FileHandleHolder> file_handle =
file_io_resource->file_handle();
if (!FileIOResource::FileHandleHolder::IsValid(file_handle))
return PP_ERROR_FAILED;
if (length < 0 || offset < 0 ||
!base::IsValueInRangeForNumericType<off_t>(offset)) {
return PP_ERROR_BADARGUMENT;
}
if (!base::IsValueInRangeForNumericType<size_t>(length)) {
return PP_ERROR_NOMEMORY;
}
// Ensure any bits we don't recognize are zero.
if (protection &
~(PP_FILEMAPPROTECTION_READ | PP_FILEMAPPROTECTION_WRITE)) {
return PP_ERROR_BADARGUMENT;
}
if (flags &
~(PP_FILEMAPFLAG_SHARED | PP_FILEMAPFLAG_PRIVATE |
PP_FILEMAPFLAG_FIXED)) {
return PP_ERROR_BADARGUMENT;
}
// Ensure at least one of SHARED and PRIVATE is set.
if (!(flags & (PP_FILEMAPFLAG_SHARED | PP_FILEMAPFLAG_PRIVATE)))
return PP_ERROR_BADARGUMENT;
// Ensure at most one of SHARED and PRIVATE is set.
if ((flags & PP_FILEMAPFLAG_SHARED) &&
(flags & PP_FILEMAPFLAG_PRIVATE)) {
return PP_ERROR_BADARGUMENT;
}
if (!address)
return PP_ERROR_BADARGUMENT;
base::Callback<MapResult()> map_cb(
base::Bind(&FileMappingResource::DoMapBlocking, file_handle, *address,
length, protection, flags, offset));
if (callback->is_blocking()) {
// The plugin could release its reference to this instance when we release
// the proxy lock below.
scoped_refptr<FileMappingResource> protect(this);
MapResult map_result;
{
// Release the proxy lock while making a potentially slow file call.
ProxyAutoUnlock unlock;
map_result = map_cb.Run();
}
OnMapCompleted(address, length, callback, map_result);
return map_result.result;
} else {
base::PostTaskAndReplyWithResult(
PpapiGlobals::Get()->GetFileTaskRunner(),
FROM_HERE,
map_cb,
RunWhileLocked(Bind(&FileMappingResource::OnMapCompleted,
this,
base::Unretained(address),
length,
callback)));
return PP_OK_COMPLETIONPENDING;
}
}
int32_t FileMappingResource::Unmap(PP_Instance /* instance */,
const void* address,
int64_t length,
scoped_refptr<TrackedCallback> callback) {
if (!address)
return PP_ERROR_BADARGUMENT;
if (!base::IsValueInRangeForNumericType<size_t>(length))
return PP_ERROR_BADARGUMENT;
base::Callback<int32_t()> unmap_cb(
base::Bind(&FileMappingResource::DoUnmapBlocking, address, length));
if (callback->is_blocking()) {
// Release the proxy lock while making a potentially slow file call.
ProxyAutoUnlock unlock;
return unmap_cb.Run();
} else {
base::PostTaskAndReplyWithResult(
PpapiGlobals::Get()->GetFileTaskRunner(),
FROM_HERE,
unmap_cb,
RunWhileLocked(Bind(&TrackedCallback::Run, callback)));
return PP_OK_COMPLETIONPENDING;
}
}
int64_t FileMappingResource::GetMapPageSize(PP_Instance /* instance */) {
return DoGetMapPageSize();
}
void FileMappingResource::OnMapCompleted(
void** mapped_address_out_param,
int64_t length,
scoped_refptr<TrackedCallback> callback,
const MapResult& map_result) {
if (callback->aborted()) {
if (map_result.result == PP_OK) {
// If the Map operation was successful, we need to Unmap to avoid leaks.
// The plugin won't get the address, so doesn't have a chance to do the
// Unmap.
PpapiGlobals::Get()->GetFileTaskRunner()->PostTask(
FROM_HERE,
base::Bind(base::IgnoreResult(&FileMappingResource::DoUnmapBlocking),
map_result.address,
length));
}
return;
}
if (map_result.result == PP_OK)
*mapped_address_out_param = map_result.address;
if (!callback->is_blocking())
callback->Run(map_result.result);
}
} // namespace proxy
} // namespace ppapi
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