mirror of
https://github.com/minio/minio.git
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125 lines
2.6 KiB
Go
125 lines
2.6 KiB
Go
/*
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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 donut
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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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"io"
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)
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/*
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** DONUT v1 Spec **
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BlockStart uint32 // Magic="MINI"
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VersionMajor uint16
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VersionMinor uint16
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VersionPatch uint16
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VersionReserved uint16
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Reserved uint64
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GobHeaderLen uint32
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GobHeader Sizeof(GobHeader)
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BlockData uint32 // Magic="DATA"
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Data []byte
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BlockLen uint64
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BlockEnd uint32 // Magic="INIM"
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*/
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type DonutHeader struct {
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BlockStart uint32 // Magic="MINI"
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VersionMajor uint16
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VersionMinor uint16
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VersionPatch uint16
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VersionReserved uint16
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Reserved uint64
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GobHeaderLen uint32
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}
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type DonutGobHeader struct {
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DataLen uint64
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}
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type DonutFooter struct {
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BlockLen uint64
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BlockEnd uint32 // Magic="INIM"
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}
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type Donut struct {
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file io.Writer
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}
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func (donut Donut) Write(header Header, object io.Reader) error {
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var newObjectBuffer bytes.Buffer
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var headerBuffer bytes.Buffer
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// create gob header
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headerEncoder := gob.NewEncoder(&headerBuffer)
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err := headerEncoder.Encode(header)
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if err != nil {
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return err
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}
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// prefix consists of a version number and a length
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var headerPrefixBuffer bytes.Buffer
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// write version
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var version int
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version = 1
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err = binary.Write(&headerPrefixBuffer, binary.LittleEndian, version)
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if err != nil {
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return err
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}
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// write length
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var headerLength int
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headerLength = headerBuffer.Len()
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err = binary.Write(&headerPrefixBuffer, binary.LittleEndian, headerLength)
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if err != nil {
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return err
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}
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// write header prefix
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io.Copy(&newObjectBuffer, &headerPrefixBuffer)
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// write header
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io.Copy(&newObjectBuffer, &headerBuffer)
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// write header marker
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// TODO
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// write data
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_, err = io.Copy(&newObjectBuffer, object)
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if err != nil {
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return err
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}
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// write footer
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// TODO
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// write footer marker
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// TODO
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// write new object
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_, err = io.Copy(donut.file, &newObjectBuffer)
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if err != nil {
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return err
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}
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return nil
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}
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