+++ /dev/null
-// Copyright (c) 2014-2016 The btcsuite developers
-// Use of this source code is governed by an ISC
-// license that can be found in the LICENSE file.
-
-package wire
-
-import (
- "fmt"
- "io"
-
- "github.com/btcsuite/btcd/chaincfg/chainhash"
-)
-
-// 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
-}
-
-// BtcDecode decodes r using the bitcoin protocol encoding into the receiver.
-// This is part of the Message interface implementation.
-func (msg *MsgMerkleBlock) BtcDecode(r io.Reader, pver uint32, enc MessageEncoding) error {
- if pver < BIP0037Version {
- str := fmt.Sprintf("merkleblock message invalid for protocol "+
- "version %d", pver)
- return messageError("MsgMerkleBlock.BtcDecode", str)
- }
-
- err := readBlockHeader(r, pver, &msg.Header)
- if err != nil {
- return err
- }
-
- err = readElement(r, &msg.Transactions)
- if err != nil {
- return err
- }
-
- // Read num block locator hashes and limit to max.
- count, err := ReadVarInt(r, pver)
- if err != nil {
- return err
- }
- if count > maxTxPerBlock {
- str := fmt.Sprintf("too many transaction hashes for message "+
- "[count %v, max %v]", count, maxTxPerBlock)
- return messageError("MsgMerkleBlock.BtcDecode", str)
- }
-
- // Create a contiguous slice of hashes to deserialize into in order to
- // reduce the number of allocations.
- hashes := make([]chainhash.Hash, count)
- msg.Hashes = make([]*chainhash.Hash, 0, count)
- for i := uint64(0); i < count; i++ {
- hash := &hashes[i]
- err := readElement(r, hash)
- if err != nil {
- return err
- }
- msg.AddTxHash(hash)
- }
-
- msg.Flags, err = ReadVarBytes(r, pver, maxFlagsPerMerkleBlock,
- "merkle block flags size")
- return err
-}
-
-// BtcEncode encodes the receiver to w using the bitcoin protocol encoding.
-// This is part of the Message interface implementation.
-func (msg *MsgMerkleBlock) BtcEncode(w io.Writer, pver uint32, enc MessageEncoding) error {
- if pver < BIP0037Version {
- str := fmt.Sprintf("merkleblock message invalid for protocol "+
- "version %d", pver)
- return messageError("MsgMerkleBlock.BtcEncode", str)
- }
-
- // Read num transaction hashes and limit to max.
- numHashes := len(msg.Hashes)
- if numHashes > maxTxPerBlock {
- str := fmt.Sprintf("too many transaction hashes for message "+
- "[count %v, max %v]", numHashes, maxTxPerBlock)
- return messageError("MsgMerkleBlock.BtcDecode", str)
- }
- numFlagBytes := len(msg.Flags)
- if numFlagBytes > maxFlagsPerMerkleBlock {
- str := fmt.Sprintf("too many flag bytes for message [count %v, "+
- "max %v]", numFlagBytes, maxFlagsPerMerkleBlock)
- return messageError("MsgMerkleBlock.BtcDecode", str)
- }
-
- err := writeBlockHeader(w, pver, &msg.Header)
- if err != nil {
- return err
- }
-
- err = writeElement(w, msg.Transactions)
- if err != nil {
- return err
- }
-
- err = WriteVarInt(w, pver, uint64(numHashes))
- if err != nil {
- return err
- }
- for _, hash := range msg.Hashes {
- err = writeElement(w, hash)
- if err != nil {
- return err
- }
- }
-
- return WriteVarBytes(w, pver, msg.Flags)
-}
-
-// Command returns the protocol command string for the message. This is part
-// of the Message interface implementation.
-func (msg *MsgMerkleBlock) Command() string {
- return CmdMerkleBlock
-}
-
-// 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
-}
-
-// NewMsgMerkleBlock returns a new bitcoin merkleblock message that conforms to
-// the Message interface. See MsgMerkleBlock for details.
-func NewMsgMerkleBlock(bh *BlockHeader) *MsgMerkleBlock {
- return &MsgMerkleBlock{
- Header: *bh,
- Transactions: 0,
- Hashes: make([]*chainhash.Hash, 0),
- Flags: make([]byte, 0),
- }
-}
OSDN Git Service
