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path: root/zhead/header.go
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package zhead

import (
	"bytes"
	"text/template"
	"time"
)

const header = `{{define "header" -}}
date={{.Date.Format "2006-01-02T15:04:05Z07:00"}}
key={{.KeyFile}}
algorithm={{.Alg}}
bocksize={{.BlockSize}}

{{range .Sums}}{{printf "%x" .}}
{{end}}{{end}}`

type Header struct {
	Date      time.Time
	KeyFile   string
	Alg       string
	BlockSize int
	Sums      [][]byte
}

const (
	DefaultAlg       = "SHA512/256"
	DefaultBlockSize = 65535
)

func (h Header) Print() ([]byte, error) {
	t, err := template.New("header").Parse(header)
	if err != nil {
		return nil, err
	}
	buf := new(bytes.Buffer)
	err = t.ExecuteTemplate(buf, "header", h)
	return buf.Bytes(), err
}