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serialize_hashes.go
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/
serialize_hashes.go
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// Copyright 2016 Attic Labs, Inc. All rights reserved.
// Licensed under the Apache License, version 2.0:
// http://www.apache.org/licenses/LICENSE-2.0
package datas
import (
"encoding/binary"
"io"
"github.com/ndau/noms/go/chunks"
"github.com/ndau/noms/go/d"
"github.com/ndau/noms/go/hash"
)
func serializedLength(batch chunks.ReadBatch) uint32 {
return uint32(len(batch)*hash.ByteLen + binary.Size(uint32(0)))
}
func serializeHashes(w io.Writer, batch chunks.ReadBatch) {
err := binary.Write(w, binary.BigEndian, uint32(len(batch))) // 4 billion hashes is probably absurd. Maybe this should be smaller?
d.PanicIfError(err)
for h := range batch {
serializeHash(w, h)
}
}
func serializeHash(w io.Writer, h hash.Hash) {
_, err := w.Write(h[:])
d.PanicIfError(err)
}
func deserializeHashes(reader io.Reader) hash.HashSlice {
count := uint32(0)
err := binary.Read(reader, binary.BigEndian, &count)
d.PanicIfError(err)
hashes := make(hash.HashSlice, count)
for i := range hashes {
hashes[i] = deserializeHash(reader)
}
return hashes
}
func deserializeHash(reader io.Reader) hash.Hash {
h := hash.Hash{}
n, err := io.ReadFull(reader, h[:])
d.PanicIfError(err)
d.PanicIfFalse(int(hash.ByteLen) == n)
return h
}