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state: use more efficient encoding for amount

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It's variable-length anyway, so wasting 8 bytes for what typically is 1 byte
makes no sense.
This commit is contained in:
Roman Khimov 2020-09-21 21:51:33 +03:00
parent 806b89db76
commit ff11a5f990
2 changed files with 11 additions and 10 deletions
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13
pkg/core/state/nep5.go
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@ -148,9 +148,8 @@ func (t *NEP5Transfer) EncodeBinary(w *io.BinWriter) {
w.WriteBytes(t.To[:])
w.WriteU32LE(t.Block)
w.WriteU64LE(t.Timestamp)
amountBytes := bigint.ToBytes(&t.Amount)
w.WriteU64LE(uint64(len(amountBytes)))
w.WriteBytes(amountBytes)
amount := bigint.ToBytes(&t.Amount)
w.WriteVarBytes(amount)
}
// DecodeBinary implements io.Serializable interface.
@ -166,9 +165,7 @@ func (t *NEP5Transfer) DecodeBinaryReturnCount(r *io.BinReader) int {
r.ReadBytes(t.To[:])
t.Block = r.ReadU32LE()
t.Timestamp = r.ReadU64LE()
amountLen := r.ReadU64LE()
amountBytes := make([]byte, amountLen)
r.ReadBytes(amountBytes)
t.Amount = *bigint.FromBytes(amountBytes)
return 4 + util.Uint160Size*2 + 8 + 4 + (8 + len(amountBytes)) + +util.Uint256Size
amount := r.ReadVarBytes(bigint.MaxBytesLen)
t.Amount = *bigint.FromBytes(amount)
return 4 + util.Uint160Size*2 + 8 + 4 + (io.GetVarSize(len(amount)) + len(amount)) + +util.Uint256Size
}

8
pkg/encoding/bigint/bigint.go
View file

@ -6,8 +6,12 @@ import (
"math/bits"
)
// wordSizeBytes is a size of a big.Word (uint) in bytes.`
const wordSizeBytes = bits.UintSize / 8
const (
// MaxBytesLen is the maximum length of serialized integer suitable for Neo VM.
MaxBytesLen = 33 // 32 bytes for 256-bit integer plus 1 if padding needed
// wordSizeBytes is a size of a big.Word (uint) in bytes.`
wordSizeBytes = bits.UintSize / 8
)
// FromBytes converts data in little-endian format to
// an integer.