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remove node serdes, pretty sure it's redundant

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This commit is contained in:
Tadge Dryja 2016-01-18 20:17:15 -08:00
parent a3f65bb4ad
commit 6f8cf3d75a
1 changed files with 0 additions and 62 deletions
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62
elkrem/serdes.go
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@ -14,68 +14,6 @@ with 41 bytes for each stored hash, up to a maximum of 64. Receivers are
prepended with the total number of hashes, so the total max size is 2625 bytes.
*/
// ToBytes turns an ElkremNode into a 41 byte long byte slice.
// 1 byte height, 8 byte index, 32 byte hash
func (e *ElkremNode) ToBytes() ([]byte, error) {
var buf bytes.Buffer
// write 1 byte height
err := binary.Write(&buf, binary.BigEndian, e.h)
if err != nil {
return nil, err
}
// write 8 byte index
err = binary.Write(&buf, binary.BigEndian, e.i)
if err != nil {
return nil, err
}
// write 32 byte sha hash
n, err := buf.Write(e.sha.Bytes())
if err != nil {
return nil, err
}
if n != 32 {
return nil, fmt.Errorf("%d byte hash, expect 32", n)
}
return buf.Bytes(), nil
}
// ElkremNodeFromBytes turns a 41 byte long byte slice into an ElkremNode.
// 1 byte height, 8 byte index, 32 byte hash.
func ElkremNodeFromBytes(b []byte) (ElkremNode, error) {
var e ElkremNode
buf := bytes.NewBuffer(b)
// read 1 byte height
err := binary.Read(buf, binary.BigEndian, &e.h)
if err != nil {
return e, err
}
// read 8 byte index
err = binary.Read(buf, binary.BigEndian, &e.i)
if err != nil {
return e, err
}
// read 32 byte sha hash
err = e.sha.SetBytes(buf.Next(32))
if err != nil {
return e, err
}
// sanity check. Node that this doesn't check that index and height
// match. Could add that but it's slow.
if e.h > 63 { // check for super high nodes
return e, fmt.Errorf("Read invalid node height %d", e.h)
}
var max uint64 // maximum possible given height
for j := uint8(0); j <= e.h; j++ {
max = max<<1 | 1
}
if e.i > max-1 { // check for index higher than height allows
return e, fmt.Errorf("Node claims index %d; %d max at height %d",
e.i, max-1, e.h)
}
return e, nil
}
// ToBytes turns the Elkrem Sender into a 41 byte slice:
// first the tree height (1 byte), then 8 byte index of last sent,
// then the 32 byte root sha hash.