90 lines
2.5 KiB
Go
90 lines
2.5 KiB
Go
// Copyright (c) 2014-2015 The btcsuite developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package wire
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import (
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"fmt"
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"io"
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)
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const (
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// MaxFilterAddDataSize is the maximum byte size of a data
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// element to add to the Bloom filter. It is equal to the
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// maximum element size of a script.
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MaxFilterAddDataSize = 520
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)
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// MsgFilterAdd implements the Message interface and represents a bitcoin
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// filteradd message. It is used to add a data element to an existing Bloom
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// filter.
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//
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// This message was not added until protocol version BIP0037Version.
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type MsgFilterAdd struct {
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Data []byte
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}
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// BtcDecode decodes r using the bitcoin protocol encoding into the receiver.
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// This is part of the Message interface implementation.
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func (msg *MsgFilterAdd) BtcDecode(r io.Reader, pver uint32) error {
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if pver < BIP0037Version {
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str := fmt.Sprintf("filteradd message invalid for protocol "+
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"version %d", pver)
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return messageError("MsgFilterAdd.BtcDecode", str)
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}
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var err error
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msg.Data, err = readVarBytes(r, pver, MaxFilterAddDataSize,
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"filteradd data")
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if err != nil {
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return err
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}
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return nil
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}
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// BtcEncode encodes the receiver to w using the bitcoin protocol encoding.
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// This is part of the Message interface implementation.
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func (msg *MsgFilterAdd) BtcEncode(w io.Writer, pver uint32) error {
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if pver < BIP0037Version {
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str := fmt.Sprintf("filteradd message invalid for protocol "+
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"version %d", pver)
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return messageError("MsgFilterAdd.BtcEncode", str)
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}
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size := len(msg.Data)
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if size > MaxFilterAddDataSize {
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str := fmt.Sprintf("filteradd size too large for message "+
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"[size %v, max %v]", size, MaxFilterAddDataSize)
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return messageError("MsgFilterAdd.BtcEncode", str)
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}
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err := writeVarBytes(w, pver, msg.Data)
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if err != nil {
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return err
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}
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return nil
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}
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// Command returns the protocol command string for the message. This is part
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// of the Message interface implementation.
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func (msg *MsgFilterAdd) Command() string {
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return CmdFilterAdd
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}
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// MaxPayloadLength returns the maximum length the payload can be for the
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// receiver. This is part of the Message interface implementation.
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func (msg *MsgFilterAdd) MaxPayloadLength(pver uint32) uint32 {
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return uint32(VarIntSerializeSize(MaxFilterAddDataSize)) +
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MaxFilterAddDataSize
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}
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// NewMsgFilterAdd returns a new bitcoin filteradd message that conforms to the
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// Message interface. See MsgFilterAdd for details.
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func NewMsgFilterAdd(data []byte) *MsgFilterAdd {
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return &MsgFilterAdd{
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Data: data,
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}
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}
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