msgmerkleblock.go

package types

import (
	"fmt"
	chainhash "github.com/Qitmeer/qitmeer/common/hash"
)

// maxFlagsPerMerkleBlock is the maximum number of flag bytes that could
// possibly fit into a merkle block.  Since each transaction is represented by
// a single bit, this is the max number of transactions per block divided by
// 8 bits per byte.  Then an extra one to cover partials.
const maxFlagsPerMerkleBlock = MaxTxPerBlock / 8

// MsgMerkleBlock implements the Message interface and represents a bitcoin
// merkleblock message which is used to reset a Bloom filter.
//
// This message was not added until protocol version BIP0037Version.
type MsgMerkleBlock struct {
	Header       BlockHeader
	Transactions uint32
	Hashes       []*chainhash.Hash
	Flags        []byte
}

// AddTxHash adds a new transaction hash to the message.
func (msg *MsgMerkleBlock) AddTxHash(hash *chainhash.Hash) error {
	if len(msg.Hashes)+1 > MaxTxPerBlock {
		str := fmt.Sprintf("too many tx hashes for message [max %v]",
			MaxTxPerBlock)
		return messageError("MsgMerkleBlock.AddTxHash", str)
	}

	msg.Hashes = append(msg.Hashes, hash)
	return nil
}

// MaxPayloadLength returns the maximum length the payload can be for the
// receiver.  This is part of the Message interface implementation.
func (msg *MsgMerkleBlock) MaxPayloadLength(pver uint32) uint32 {
	return MaxBlockPayload
}