mirror of
https://github.com/minio/minio.git
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115 lines
3.5 KiB
Go
115 lines
3.5 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 v1
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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"=1229867341
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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"=1096040772
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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"=1296649801
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*/
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var (
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MagicMINI = binary.LittleEndian.Uint32([]byte{'M', 'I', 'N', 'I'})
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MagicDATA = binary.LittleEndian.Uint32([]byte{'D', 'A', 'T', 'A'})
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MagicINIM = binary.LittleEndian.Uint32([]byte{'I', 'N', 'I', 'M'})
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)
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type DonutFormat struct {
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BlockStart uint32 // Magic="MINI"=1229867341
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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 uint32 // Magic="DATA"=1096040772
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Data io.Reader
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BlockLen uint64
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BlockEnd uint32
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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"=1229867341
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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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donutFormat := DonutFormat{
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BlockStart: MagicMINI,
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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: MagicDATA,
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Data: object,
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BlockLen: 0,
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BlockEnd: MagicINIM,
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}
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if err := donut.WriteFormat(donut.file, donutFormat); 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) WriteFormat(target io.Writer, donutFormat DonutFormat) error {
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err := binary.Write(target, binary.LittleEndian, donutFormat.BlockStart)
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err = binary.Write(target, binary.LittleEndian, donutFormat.VersionMajor)
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err = binary.Write(target, binary.LittleEndian, donutFormat.VersionMinor)
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err = binary.Write(target, binary.LittleEndian, donutFormat.VersionPatch)
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err = binary.Write(target, binary.LittleEndian, donutFormat.VersionReserved)
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err = binary.Write(target, binary.LittleEndian, donutFormat.Reserved)
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err = binary.Write(target, binary.LittleEndian, donutFormat.GobHeaderLen)
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err = binary.Write(target, binary.LittleEndian, donutFormat.GobHeader)
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err = binary.Write(target, binary.LittleEndian, donutFormat.BlockData)
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err = binary.Write(target, binary.LittleEndian, donutFormat.Data)
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err = binary.Write(target, binary.LittleEndian, donutFormat.BlockLen)
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err = binary.Write(target, binary.LittleEndian, donutFormat.BlockEnd)
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return err
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}
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