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shard.go
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shard.go
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package kidwords
import (
"bytes"
"io"
"math"
"strings"
"github.com/dkotik/kidwords/shamir"
"github.com/dkotik/kidwords/tgrid"
)
type Shards []string
func (s Shards) Grid(columns, wrap int) tgrid.Grid {
total := len(s)
rows := int(math.Ceil(float64(total) / float64(columns)))
g := tgrid.Grid(make([]tgrid.Row, rows))
for i := 0; i < rows; i++ {
row := make([]*tgrid.Cell, columns)
for j := 0; j < columns; j++ {
index := i + j
if index >= total {
g.Normalize()
return g
}
cell := tgrid.NewCellFromBytes([]byte(s[i+j]), wrap)
// cell, err := from()
// if err != nil {
// return nil, err
// }
row[j] = cell
}
g[i] = row
}
g.Normalize()
return g
}
func (s Shards) WriteHTML(w io.Writer, columns int) (err error) {
if _, err = w.Write([]byte("<table>")); err != nil {
return err
}
if _, err = w.Write([]byte("<tr>")); err != nil {
return err
}
for i, shard := range s {
if i > 0 && i%columns == 0 {
if _, err = w.Write([]byte("</tr><tr>")); err != nil {
return err
}
}
if _, err = w.Write([]byte("<td>")); err != nil {
return err
}
if _, err = io.Copy(w, strings.NewReader(shard)); err != nil {
return err
}
if _, err = w.Write([]byte("</td>")); err != nil {
return err
}
}
if _, err = w.Write([]byte("</tr>")); err != nil {
return err
}
_, err = w.Write([]byte("</table>"))
return err
}
func (s Shards) Write(w io.Writer) (int, error) {
return s.Grid(4, 18).Write(w)
}
func (s Shards) String() string {
b := &bytes.Buffer{}
if _, err := s.Write(b); err != nil {
return "<unserializable>"
}
return b.String()
}
func Split(
key string,
total,
quorum int,
withOptions ...WriterOption,
) (shards Shards, err error) {
raw, err := shamir.Split([]byte(key), total, quorum)
if err != nil {
return nil, err
}
shards = make([]string, len(raw))
for i, shard := range raw {
encoded, err := FromBytes(shard, withOptions...)
if err != nil {
return nil, err
}
shards[i] = encoded
}
return shards, nil
}