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108 lines
3.3 KiB
108 lines
3.3 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 donut
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import (
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"encoding/binary"
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"io"
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)
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/*
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DONUT v1 Spec
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**********************
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BlockStart [4]byte // 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 io.Reader // matches length
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BlockData [4]byte // Magic="DATA"
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Data io.Reader // matches length
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BlockLen uint64 // length to block start
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BlockEnd [4]byte // Magic="INIM"
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*/
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type DonutStructure struct {
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BlockStart [4]byte // 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 GobHeader
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BlockData [4]byte
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Data io.Reader
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BlockLen uint64
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BlockEnd [4]byte
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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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// mutex
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}
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type GobHeader struct{}
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func (donut *Donut) Write(gobHeader GobHeader, object io.Reader) error {
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// TODO mutex
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// Create bytes buffer representing the new object
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donutStructure := DonutStructure{
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BlockStart: [4]byte{'M', 'I', 'N', 'I'},
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VersionMajor: 1,
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VersionMinor: 0,
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VersionPatch: 0,
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VersionReserved: 0,
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Reserved: 0,
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GobHeaderLen: 0,
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GobHeader: gobHeader,
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BlockData: [4]byte{'D', 'A', 'T', 'A'},
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Data: object,
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BlockLen: 0,
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BlockEnd: [4]byte{'I', 'N', 'I', 'M'},
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}
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if err := donut.WriteStructure(donut.file, donutStructure); 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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func (donut *Donut) WriteStructure(target io.Writer, donutStructure DonutStructure) error {
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err := binary.Write(target, binary.LittleEndian, donutStructure.BlockStart)
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err = binary.Write(target, binary.LittleEndian, donutStructure.VersionMajor)
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err = binary.Write(target, binary.LittleEndian, donutStructure.VersionMinor)
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err = binary.Write(target, binary.LittleEndian, donutStructure.VersionPatch)
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err = binary.Write(target, binary.LittleEndian, donutStructure.VersionReserved)
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err = binary.Write(target, binary.LittleEndian, donutStructure.Reserved)
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err = binary.Write(target, binary.LittleEndian, donutStructure.GobHeaderLen)
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err = binary.Write(target, binary.LittleEndian, donutStructure.GobHeader)
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err = binary.Write(target, binary.LittleEndian, donutStructure.BlockData)
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err = binary.Write(target, binary.LittleEndian, donutStructure.Data)
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err = binary.Write(target, binary.LittleEndian, donutStructure.BlockLen)
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err = binary.Write(target, binary.LittleEndian, donutStructure.BlockEnd)
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return err
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}
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