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// Copyright (c) 2012 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/shared_impl/ppb_file_io_shared.h"
#include <string.h>
#include "base/bind.h"
#include "base/logging.h"
#include "base/message_loop.h"
#include "ppapi/c/pp_errors.h"
#include "ppapi/shared_impl/array_writer.h"
#include "ppapi/shared_impl/file_type_conversion.h"
#include "ppapi/shared_impl/time_conversion.h"
#include "ppapi/thunk/enter.h"
#include "ppapi/thunk/ppb_file_ref_api.h"
namespace ppapi {
using thunk::EnterResourceNoLock;
using thunk::PPB_FileIO_API;
using thunk::PPB_FileRef_API;
namespace {
// An adapter to let Read() share the same implementation with ReadToArray().
void* DummyGetDataBuffer(void* user_data, uint32_t count, uint32_t size) {
return user_data;
}
} // namespace
PPB_FileIO_Shared::CallbackEntry::CallbackEntry()
: info(NULL) {
}
PPB_FileIO_Shared::CallbackEntry::CallbackEntry(const CallbackEntry& entry)
: callback(entry.callback),
read_buffer(entry.read_buffer),
info(entry.info) {
}
PPB_FileIO_Shared::CallbackEntry::~CallbackEntry() {
}
PPB_FileIO_Shared::PPB_FileIO_Shared(PP_Instance instance)
: Resource(OBJECT_IS_IMPL, instance),
file_system_type_(PP_FILESYSTEMTYPE_INVALID),
file_open_(false),
pending_op_(OPERATION_NONE) {
}
PPB_FileIO_Shared::PPB_FileIO_Shared(const HostResource& host_resource)
: Resource(OBJECT_IS_PROXY, host_resource),
file_system_type_(PP_FILESYSTEMTYPE_INVALID),
file_open_(false),
pending_op_(OPERATION_NONE) {
}
PPB_FileIO_Shared::~PPB_FileIO_Shared() {
}
thunk::PPB_FileIO_API* PPB_FileIO_Shared::AsPPB_FileIO_API() {
return this;
}
int32_t PPB_FileIO_Shared::Open(PP_Resource file_ref,
int32_t open_flags,
scoped_refptr<TrackedCallback> callback) {
EnterResourceNoLock<PPB_FileRef_API> enter(file_ref, true);
if (enter.failed())
return PP_ERROR_BADRESOURCE;
int32_t rv = CommonCallValidation(false, OPERATION_EXCLUSIVE);
if (rv != PP_OK)
return rv;
PP_FileSystemType type = enter.object()->GetFileSystemType();
if (type != PP_FILESYSTEMTYPE_LOCALPERSISTENT &&
type != PP_FILESYSTEMTYPE_LOCALTEMPORARY &&
type != PP_FILESYSTEMTYPE_EXTERNAL)
return PP_ERROR_FAILED;
file_system_type_ = type;
return OpenValidated(file_ref, enter.object(), open_flags, callback);
}
int32_t PPB_FileIO_Shared::Query(PP_FileInfo* info,
scoped_refptr<TrackedCallback> callback) {
int32_t rv = CommonCallValidation(true, OPERATION_EXCLUSIVE);
if (rv != PP_OK)
return rv;
if (!info)
return PP_ERROR_BADARGUMENT;
return QueryValidated(info, callback);
}
int32_t PPB_FileIO_Shared::Touch(PP_Time last_access_time,
PP_Time last_modified_time,
scoped_refptr<TrackedCallback> callback) {
int32_t rv = CommonCallValidation(true, OPERATION_EXCLUSIVE);
if (rv != PP_OK)
return rv;
return TouchValidated(last_access_time, last_modified_time, callback);
}
int32_t PPB_FileIO_Shared::Read(int64_t offset,
char* buffer,
int32_t bytes_to_read,
scoped_refptr<TrackedCallback> callback) {
int32_t rv = CommonCallValidation(true, OPERATION_READ);
if (rv != PP_OK)
return rv;
PP_ArrayOutput buffer_adapter = { &DummyGetDataBuffer, buffer };
return ReadValidated(offset, buffer_adapter, bytes_to_read, callback);
}
int32_t PPB_FileIO_Shared::ReadToArray(
int64_t offset,
int32_t max_read_length,
PP_ArrayOutput* output_array_buffer,
scoped_refptr<TrackedCallback> callback) {
int32_t rv = CommonCallValidation(true, OPERATION_READ);
if (rv != PP_OK)
return rv;
if (!output_array_buffer)
return PP_ERROR_BADARGUMENT;
return ReadValidated(offset, *output_array_buffer, max_read_length, callback);
}
int32_t PPB_FileIO_Shared::Write(int64_t offset,
const char* buffer,
int32_t bytes_to_write,
scoped_refptr<TrackedCallback> callback) {
int32_t rv = CommonCallValidation(true, OPERATION_WRITE);
if (rv != PP_OK)
return rv;
return WriteValidated(offset, buffer, bytes_to_write, callback);
}
int32_t PPB_FileIO_Shared::SetLength(int64_t length,
scoped_refptr<TrackedCallback> callback) {
int32_t rv = CommonCallValidation(true, OPERATION_EXCLUSIVE);
if (rv != PP_OK)
return rv;
return SetLengthValidated(length, callback);
}
int32_t PPB_FileIO_Shared::Flush(scoped_refptr<TrackedCallback> callback) {
int32_t rv = CommonCallValidation(true, OPERATION_EXCLUSIVE);
if (rv != PP_OK)
return rv;
return FlushValidated(callback);
}
void PPB_FileIO_Shared::ExecuteGeneralCallback(int32_t pp_error) {
RunAndRemoveFirstPendingCallback(pp_error);
}
void PPB_FileIO_Shared::ExecuteOpenFileCallback(int32_t pp_error) {
if (pp_error == PP_OK)
file_open_ = true;
ExecuteGeneralCallback(pp_error);
}
void PPB_FileIO_Shared::ExecuteQueryCallback(int32_t pp_error,
const PP_FileInfo& info) {
if (pending_op_ != OPERATION_EXCLUSIVE || callbacks_.empty() ||
!callbacks_.front().info) {
NOTREACHED();
return;
}
*callbacks_.front().info = info;
RunAndRemoveFirstPendingCallback(pp_error);
}
void PPB_FileIO_Shared::ExecuteReadCallback(int32_t pp_error_or_bytes,
const char* data) {
if (pending_op_ != OPERATION_READ || callbacks_.empty()) {
NOTREACHED();
return;
}
// The result code contains the number of bytes if it's positive.
ArrayWriter output;
output.set_pp_array_output(callbacks_.front().read_buffer);
if (output.is_valid()) {
output.StoreArray(data, std::max(0, pp_error_or_bytes));
}
// Always issue the callback.
RunAndRemoveFirstPendingCallback(pp_error_or_bytes);
}
int32_t PPB_FileIO_Shared::CommonCallValidation(bool should_be_open,
OperationType new_op) {
// Only asynchronous operation is supported.
if (should_be_open) {
if (!file_open_)
return PP_ERROR_FAILED;
} else {
if (file_open_)
return PP_ERROR_FAILED;
}
if (pending_op_ != OPERATION_NONE &&
(pending_op_ != new_op || pending_op_ == OPERATION_EXCLUSIVE)) {
return PP_ERROR_INPROGRESS;
}
return PP_OK;
}
void PPB_FileIO_Shared::RegisterCallback(
OperationType op,
scoped_refptr<TrackedCallback> callback,
const PP_ArrayOutput* read_buffer,
PP_FileInfo* info) {
DCHECK(pending_op_ == OPERATION_NONE ||
(pending_op_ != OPERATION_EXCLUSIVE && pending_op_ == op));
CallbackEntry entry;
entry.callback = callback;
if (read_buffer)
entry.read_buffer = *read_buffer;
entry.info = info;
callbacks_.push_back(entry);
pending_op_ = op;
}
void PPB_FileIO_Shared::RunAndRemoveFirstPendingCallback(int32_t result) {
DCHECK(!callbacks_.empty());
CallbackEntry front = callbacks_.front();
callbacks_.pop_front();
if (callbacks_.empty())
pending_op_ = OPERATION_NONE;
front.callback->Run(result);
}
} // namespace ppapi
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