58 lines
1.1 KiB
Go
58 lines
1.1 KiB
Go
package db0402
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import (
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"encoding/binary"
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"errors"
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"slices"
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)
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type CellType uint8
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const (
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TypeI64 CellType = 1
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TypeStr CellType = 2
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)
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type Cell struct {
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Type CellType
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I64 int64
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Str []byte
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}
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func (cell *Cell) Encode(toAppend []byte) []byte {
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switch cell.Type {
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case TypeI64:
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return binary.LittleEndian.AppendUint64(toAppend, uint64(cell.I64))
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case TypeStr:
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toAppend = binary.LittleEndian.AppendUint32(toAppend, uint32(len(cell.Str)))
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return append(toAppend, cell.Str...)
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default:
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panic("unreachable")
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}
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}
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func (cell *Cell) Decode(data []byte) (rest []byte, err error) {
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switch cell.Type {
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case TypeI64:
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if len(data) < 8 {
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return data, errors.New("expect more data")
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}
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cell.I64 = int64(binary.LittleEndian.Uint64(data[0:8]))
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return data[8:], nil
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case TypeStr:
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if len(data) < 4 {
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return data, errors.New("expect more data")
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}
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size := int(binary.LittleEndian.Uint32(data[0:4]))
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if len(data) < 4+size {
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return data, errors.New("expect more data")
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}
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cell.Str = slices.Clone(data[4 : 4+size])
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return data[4+size:], nil
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default:
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panic("unreachable")
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}
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}
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// QzBQWVJJOUhU https://trialofcode.org/
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