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81 lines
2.1 KiB
81 lines
2.1 KiB
/*
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* Mini Object Storage, (C) 2015 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package objectv1
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import (
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"bytes"
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"encoding/binary"
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"encoding/gob"
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"errors"
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"io"
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"strconv"
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"time"
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)
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// Package Version
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const Version = uint32(1)
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// ObjectType is the type of object stored. It is either an Object or Multipart Object.
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type ObjectType uint8
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const (
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// Object is a full object
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Object ObjectType = iota
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// MultipartObject is a collection of Objects uploaded separately that represent a large object.
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MultipartObject
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)
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// Object Metadata
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type ObjectMetadata struct {
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Bucket string
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Key string
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ErasurePart uint16
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EncodedPart uint8
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ContentType string
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Created time.Time
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Length uint64
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Md5 []byte
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ObjectType ObjectType
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}
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func Write(target io.Writer, metadata ObjectMetadata, reader io.Reader) error {
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buffer := new(bytes.Buffer)
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binary.Write(buffer, binary.LittleEndian, uint32(Version))
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encoder := gob.NewEncoder(buffer)
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if err := encoder.Encode(metadata); err != nil {
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return err
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}
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reader = io.MultiReader(buffer, reader)
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_, err := io.Copy(target, reader)
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return err
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}
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func ReadMetadata(reader io.Reader) (metadata ObjectMetadata, err error) {
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versionBytes := make([]byte, 4)
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if err := binary.Read(reader, binary.LittleEndian, versionBytes); err != nil {
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return metadata, err
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}
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var version uint32
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version = binary.LittleEndian.Uint32(versionBytes)
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if version != 1 {
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return metadata, errors.New("Unknown Version: " + strconv.FormatUint(uint64(version), 10))
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}
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decoder := gob.NewDecoder(reader)
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err = decoder.Decode(&metadata)
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return metadata, err
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}
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