// Copyright (C) 2016 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package stringtable

import (
	"fmt"
	"os"

	"android.googlesource.com/platform/tools/gpu/framework/binary/cyclic"
	"android.googlesource.com/platform/tools/gpu/framework/binary/endian"
	"android.googlesource.com/platform/tools/gpu/framework/device"
)

// Load loads a string table from the specified path.
func Load(path string) (*StringTable, error) {
	file, err := os.Open(path)
	if err != nil {
		return nil, err
	}
	defer file.Close()
	d := cyclic.Decoder(endian.Reader(file, device.LittleEndian))
	o := d.Object()
	if err := d.Error(); err != nil {
		return nil, err
	}

	st, ok := o.(*StringTable)
	if !ok {
		return nil, fmt.Errorf("Decoded object was not a stringtable, but a %T", st)
	}

	return st, nil
}