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<h1 class="page-title">Source: utils/writer.js</h1>
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<pre class="prettyprint source linenums"><code>/*!
* writer.js - buffer writer for bcoin
* Copyright (c) 2014-2015, Fedor Indutny (MIT License)
* Copyright (c) 2014-2017, Christopher Jeffrey (MIT License).
* https://github.com/bcoin-org/bcoin
*/
'use strict';
var assert = require('assert');
var encoding = require('./encoding');
var crypto = require('../crypto/crypto');
/*
* Constants
*/
var SEEK = 0;
var UI8 = 1;
var UI16 = 2;
var UI16BE = 3;
var UI32 = 4;
var UI32BE = 5;
var UI64 = 6;
var UI64BE = 7;
var I8 = 8;
var I16 = 9;
var I16BE = 10;
var I32 = 11;
var I32BE = 12;
var I64 = 13;
var I64BE = 14;
var FL = 15;
var FLBE = 16;
var DBL = 17;
var DBLBE = 18;
var VARINT = 19;
var VARINT2 = 20;
var BYTES = 21;
var STR = 22;
var CHECKSUM = 23;
var FILL = 24;
/**
* An object that allows writing of buffers in a
* sane manner. This buffer writer is extremely
* optimized since it does not actually write
* anything until `render` is called. It makes
* one allocation: at the end, once it knows the
* size of the buffer to be allocated. Because
* of this, it can also act as a size calculator
* which is useful for guaging block size
* without actually serializing any data.
* @alias module:utils.BufferWriter
* @constructor
*/
function BufferWriter() {
if (!(this instanceof BufferWriter))
return new BufferWriter();
this.ops = [];
this.written = 0;
}
/**
* Allocate and render the final buffer.
* @param {Boolean?} keep - Do not destroy the writer.
* @returns {Buffer} Rendered buffer.
*/
BufferWriter.prototype.render = function render(keep) {
var data = new Buffer(this.written);
var off = 0;
var i, op;
for (i = 0; i &lt; this.ops.length; i++) {
op = this.ops[i];
switch (op.type) {
case SEEK: off += op.value; break;
case UI8: off = data.writeUInt8(op.value, off, true); break;
case UI16: off = data.writeUInt16LE(op.value, off, true); break;
case UI16BE: off = data.writeUInt16BE(op.value, off, true); break;
case UI32: off = data.writeUInt32LE(op.value, off, true); break;
case UI32BE: off = data.writeUInt32BE(op.value, off, true); break;
case UI64: off = encoding.writeU64(data, op.value, off); break;
case UI64BE: off = encoding.writeU64BE(data, op.value, off); break;
case I8: off = data.writeInt8(op.value, off, true); break;
case I16: off = data.writeInt16LE(op.value, off, true); break;
case I16BE: off = data.writeInt16BE(op.value, off, true); break;
case I32: off = data.writeInt32LE(op.value, off, true); break;
case I32BE: off = data.writeInt32BE(op.value, off, true); break;
case I64: off = encoding.write64(data, op.value, off); break;
case I64BE: off = encoding.write64BE(data, op.value, off); break;
case FL: off = data.writeFloatLE(op.value, off, true); break;
case FLBE: off = data.writeFloatBE(op.value, off, true); break;
case DBL: off = data.writeDoubleLE(op.value, off, true); break;
case DBLBE: off = data.writeDoubleBE(op.value, off, true); break;
case VARINT: off = encoding.writeVarint(data, op.value, off); break;
case VARINT2: off = encoding.writeVarint2(data, op.value, off); break;
case BYTES: off += op.value.copy(data, off); break;
case STR: off += data.write(op.value, off, op.enc); break;
case CHECKSUM:
off += crypto.hash256(data.slice(0, off)).copy(data, off, 0, 4);
break;
case FILL:
data.fill(op.value, off, off + op.size);
off += op.size;
break;
default:
assert(false, 'Bad type.');
break;
}
}
assert(off === data.length);
if (!keep)
this.destroy();
return data;
};
/**
* Get size of data written so far.
* @returns {Number}
*/
BufferWriter.prototype.getSize = function getSize() {
return this.written;
};
/**
* Seek to relative offset.
* @param {Number} offset
*/
BufferWriter.prototype.seek = function seek(offset) {
this.written += offset;
this.ops.push(new WriteOp(SEEK, offset));
};
/**
* Destroy the buffer writer. Remove references to `ops`.
*/
BufferWriter.prototype.destroy = function destroy() {
this.ops.length = 0;
this.ops = null;
this.written = null;
};
/**
* Write uint8.
* @param {Number} value
*/
BufferWriter.prototype.writeU8 = function writeU8(value) {
this.written += 1;
this.ops.push(new WriteOp(UI8, value));
};
/**
* Write uint16le.
* @param {Number} value
*/
BufferWriter.prototype.writeU16 = function writeU16(value) {
this.written += 2;
this.ops.push(new WriteOp(UI16, value));
};
/**
* Write uint16be.
* @param {Number} value
*/
BufferWriter.prototype.writeU16BE = function writeU16BE(value) {
this.written += 2;
this.ops.push(new WriteOp(UI16BE, value));
};
/**
* Write uint32le.
* @param {Number} value
*/
BufferWriter.prototype.writeU32 = function writeU32(value) {
this.written += 4;
this.ops.push(new WriteOp(UI32, value));
};
/**
* Write uint32be.
* @param {Number} value
*/
BufferWriter.prototype.writeU32BE = function writeU32BE(value) {
this.written += 4;
this.ops.push(new WriteOp(UI32BE, value));
};
/**
* Write uint64le.
* @param {Number} value
*/
BufferWriter.prototype.writeU64 = function writeU64(value) {
this.written += 8;
this.ops.push(new WriteOp(UI64, value));
};
/**
* Write uint64be.
* @param {Number} value
*/
BufferWriter.prototype.writeU64BE = function writeU64BE(value) {
this.written += 8;
this.ops.push(new WriteOp(UI64BE, value));
};
/**
* Write uint64le.
* @param {BN} value
*/
BufferWriter.prototype.writeU64BN = function writeU64BN(value) {
assert(false, 'Not implemented.');
};
/**
* Write uint64be.
* @param {BN} value
*/
BufferWriter.prototype.writeU64BEBN = function writeU64BEBN(value) {
assert(false, 'Not implemented.');
};
/**
* Write int8.
* @param {Number} value
*/
BufferWriter.prototype.write8 = function write8(value) {
this.written += 1;
this.ops.push(new WriteOp(I8, value));
};
/**
* Write int16le.
* @param {Number} value
*/
BufferWriter.prototype.write16 = function write16(value) {
this.written += 2;
this.ops.push(new WriteOp(I16, value));
};
/**
* Write int16be.
* @param {Number} value
*/
BufferWriter.prototype.write16BE = function write16BE(value) {
this.written += 2;
this.ops.push(new WriteOp(I16BE, value));
};
/**
* Write int32le.
* @param {Number} value
*/
BufferWriter.prototype.write32 = function write32(value) {
this.written += 4;
this.ops.push(new WriteOp(I32, value));
};
/**
* Write int32be.
* @param {Number} value
*/
BufferWriter.prototype.write32BE = function write32BE(value) {
this.written += 4;
this.ops.push(new WriteOp(I32BE, value));
};
/**
* Write int64le.
* @param {Number} value
*/
BufferWriter.prototype.write64 = function write64(value) {
this.written += 8;
this.ops.push(new WriteOp(I64, value));
};
/**
* Write int64be.
* @param {Number} value
*/
BufferWriter.prototype.write64BE = function write64BE(value) {
this.written += 8;
this.ops.push(new WriteOp(I64BE, value));
};
/**
* Write int64le.
* @param {BN} value
*/
BufferWriter.prototype.write64BN = function write64BN(value) {
assert(false, 'Not implemented.');
};
/**
* Write int64be.
* @param {BN} value
*/
BufferWriter.prototype.write64BEBN = function write64BEBN(value) {
assert(false, 'Not implemented.');
};
/**
* Write float le.
* @param {Number} value
*/
BufferWriter.prototype.writeFloat = function writeFloat(value) {
this.written += 4;
this.ops.push(new WriteOp(FL, value));
};
/**
* Write float be.
* @param {Number} value
*/
BufferWriter.prototype.writeFloatBE = function writeFloatBE(value) {
this.written += 4;
this.ops.push(new WriteOp(FLBE, value));
};
/**
* Write double le.
* @param {Number} value
*/
BufferWriter.prototype.writeDouble = function writeDouble(value) {
this.written += 8;
this.ops.push(new WriteOp(DBL, value));
};
/**
* Write double be.
* @param {Number} value
*/
BufferWriter.prototype.writeDoubleBE = function writeDoubleBE(value) {
this.written += 8;
this.ops.push(new WriteOp(DBLBE, value));
};
/**
* Write a varint.
* @param {Number} value
*/
BufferWriter.prototype.writeVarint = function writeVarint(value) {
this.written += encoding.sizeVarint(value);
this.ops.push(new WriteOp(VARINT, value));
};
/**
* Write a varint.
* @param {BN} value
*/
BufferWriter.prototype.writeVarintBN = function writeVarintBN(value) {
assert(false, 'Not implemented.');
};
/**
* Write a varint (type 2).
* @param {Number} value
*/
BufferWriter.prototype.writeVarint2 = function writeVarint2(value) {
this.written += encoding.sizeVarint2(value);
this.ops.push(new WriteOp(VARINT2, value));
};
/**
* Write a varint (type 2).
* @param {BN} value
*/
BufferWriter.prototype.writeVarint2BN = function writeVarint2BN(value) {
assert(false, 'Not implemented.');
};
/**
* Write bytes.
* @param {Buffer} value
*/
BufferWriter.prototype.writeBytes = function writeBytes(value) {
if (value.length === 0)
return;
this.written += value.length;
this.ops.push(new WriteOp(BYTES, value));
};
/**
* Write bytes with a varint length before them.
* @param {Buffer} value
*/
BufferWriter.prototype.writeVarBytes = function writeVarBytes(value) {
this.written += encoding.sizeVarint(value.length);
this.ops.push(new WriteOp(VARINT, value.length));
if (value.length === 0)
return;
this.written += value.length;
this.ops.push(new WriteOp(BYTES, value));
};
/**
* Copy bytes.
* @param {Buffer} value
* @param {Number} start
* @param {Number} end
*/
BufferWriter.prototype.copy = function copy(value, start, end) {
assert(end >= start);
value = value.slice(start, end);
this.writeBytes(value);
};
/**
* Write string to buffer.
* @param {String} value
* @param {String?} enc - Any buffer-supported encoding.
*/
BufferWriter.prototype.writeString = function writeString(value, enc) {
if (value.length === 0)
return;
this.written += Buffer.byteLength(value, enc);
this.ops.push(new WriteOp(STR, value, enc));
};
/**
* Write a 32 byte hash.
* @param {Hash} value
*/
BufferWriter.prototype.writeHash = function writeHash(value) {
if (typeof value !== 'string') {
assert(value.length === 32);
return this.writeBytes(value);
}
assert(value.length === 64);
this.writeString(value, 'hex');
};
/**
* Write a string with a varint length before it.
* @param {String}
* @param {String?} enc - Any buffer-supported encoding.
*/
BufferWriter.prototype.writeVarString = function writeVarString(value, enc) {
var size;
if (value.length === 0) {
this.ops.push(new WriteOp(VARINT, 0));
return;
}
size = Buffer.byteLength(value, enc);
this.written += encoding.sizeVarint(size);
this.written += size;
this.ops.push(new WriteOp(VARINT, size));
this.ops.push(new WriteOp(STR, value, enc));
};
/**
* Write a null-terminated string.
* @param {String|Buffer}
* @param {String?} enc - Any buffer-supported encoding.
*/
BufferWriter.prototype.writeNullString = function writeNullString(value, enc) {
this.writeString(value, enc);
this.writeU8(0);
};
/**
* Calculate and write a checksum for the data written so far.
*/
BufferWriter.prototype.writeChecksum = function writeChecksum() {
this.written += 4;
this.ops.push(new WriteOp(CHECKSUM));
};
/**
* Fill N bytes with value.
* @param {Number} value
* @param {Number} size
*/
BufferWriter.prototype.fill = function fill(value, size) {
assert(size >= 0);
if (size === 0)
return;
this.written += size;
this.ops.push(new WriteOp(FILL, value, null, size));
};
/*
* Helpers
*/
function WriteOp(type, value, enc, size) {
this.type = type;
this.value = value;
this.enc = enc;
this.size = size;
}
/*
* Expose
*/
module.exports = BufferWriter;
</code></pre>
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href="module-net_bip152-CompactBlock.html">CompactBlock</a></li><li><a href="module-net_bip152-PrefilledTX.html">PrefilledTX</a></li><li><a href="module-net_bip152-TXRequest.html">TXRequest</a></li><li><a href="module-net_bip152-TXResponse.html">TXResponse</a></li><li><a href="module-net_packets-AddrPacket.html">AddrPacket</a></li><li><a href="module-net_packets-AuthChallengePacket.html">AuthChallengePacket</a></li><li><a href="module-net_packets-AuthProposePacket.html">AuthProposePacket</a></li><li><a href="module-net_packets-AuthReplyPacket.html">AuthReplyPacket</a></li><li><a href="module-net_packets-BlockPacket.html">BlockPacket</a></li><li><a href="module-net_packets-BlockTxnPacket.html">BlockTxnPacket</a></li><li><a href="module-net_packets-CmpctBlockPacket.html">CmpctBlockPacket</a></li><li><a href="module-net_packets-EncackPacket.html">EncackPacket</a></li><li><a href="module-net_packets-EncinitPacket.html">EncinitPacket</a></li><li><a href="module-net_packets-FeeFilterPacket.html">FeeFilterPacket</a></li><li><a href="module-net_packets-FilterAddPacket.html">FilterAddPacket</a></li><li><a href="module-net_packets-FilterClearPacket.html">FilterClearPacket</a></li><li><a href="module-net_packets-FilterLoadPacket.html">FilterLoadPacket</a></li><li><a href="module-net_packets-GetAddrPacket.html">GetAddrPacket</a></li><li><a href="module-net_packets-GetBlocksPacket.html">GetBlocksPacket</a></li><li><a href="module-net_packets-GetBlockTxnPacket.html">GetBlockTxnPacket</a></li><li><a href="module-net_packets-GetDataPacket.html">GetDataPacket</a></li><li><a href="module-net_packets-GetHeadersPacket.html">GetHeadersPacket</a></li><li><a href="module-net_packets-HeadersPacket.html">HeadersPacket</a></li><li><a href="module-net_packets-InvPacket.html">InvPacket</a></li><li><a href="module-net_packets-MempoolPacket.html">MempoolPacket</a></li><li><a href="module-net_packets-MerkleBlockPacket.html">MerkleBlockPacket</a></li><li><a href="module-net_packets-NotFoundPacket.html">NotFoundPacket</a></li><li><a href="module-net_packets-Packet.html">Packet</a></li><li><a href="module-net_packets-PingPacket.html">PingPacket</a></li><li><a href="module-net_packets-PongPacket.html">PongPacket</a></li><li><a href="module-net_packets-RejectPacket.html">RejectPacket</a></li><li><a href="module-net_packets-SendCmpctPacket.html">SendCmpctPacket</a></li><li><a href="module-net_packets-SendHeadersPacket.html">SendHeadersPacket</a></li><li><a href="module-net_packets-TXPacket.html">TXPacket</a></li><li><a href="module-net_packets-UnknownPacket.html">UnknownPacket</a></li><li><a href="module-net_packets-VerackPacket.html">VerackPacket</a></li><li><a href="module-net_packets-VersionPacket.html">VersionPacket</a></li><li><a href="module-net_socks-Proxy.html">Proxy</a></li><li><a href="module-net_socks-SOCKS.html">SOCKS</a></li><li><a href="module-node.FullNode.html">FullNode</a></li><li><a href="module-node.Logger.html">Logger</a></li><li><a href="module-node.Node.html">Node</a></li><li><a href="module-node.NodeClient.html">NodeClient</a></li><li><a href="module-node.SPVNode.html">SPVNode</a></li><li><a href="module-primitives.AbstractBlock.html">AbstractBlock</a></li><li><a href="module-primitives.Address.html">Address</a></li><li><a href="module-primitives.Block.html">Block</a></li><li><a href="module-primitives.Coin.html">Coin</a></li><li><a href="module-primitives.CoinSelector.html">CoinSelector</a></li><li><a href="module-primitives.Headers.html">Headers</a></li><li><a href="module-primitives.Input.html">Input</a></li><li><a href="module-primitives.InvItem.html">InvItem</a></li><li><a href="module-primitives.KeyRing.html">KeyRing</a></li><li><a href="module-primitives.MemBlock.html">MemBlock</a></li><li><a href="module-primitives.MerkleBlock.html">MerkleBlock</a></li><li><a href="module-primitives.MTX.html">MTX</a></li><li><a href="module-primitives.NetAddress.html">NetAddress</a></li><li><a href="module-primitives.Outpoint.html">Outpoint</a></li><li><a href="module-primitives.Output.html">Output</a></li><li><a href="module-primitives.TX.html">TX</a></li><li><a href="module-primitives.TXMeta.html">TXMeta</a></li><li><a href="module-protocol.Network.html">Network</a></li><li><a href="module-protocol.TimeData.html">TimeData</a></li><li><a href="module-protocol_errors-VerifyError.html">VerifyError</a></li><li><a href="module-protocol_errors-VerifyResult.html">VerifyResult</a></li><li><a href="module-script.Opcode.html">Opcode</a></li><li><a href="module-script.Program.html">Program</a></li><li><a href="module-script.Script.html">Script</a></li><li><a href="module-script.ScriptError.html">ScriptError</a></li><li><a href="module-script.SigCache.html">SigCache</a></li><li><a href="module-script.Stack.html">Stack</a></li><li><a href="module-script.Witness.html">Witness</a></li><li><a href="module-utils.AsyncEmitter.html">AsyncEmitter</a></li><li><a href="module-utils.AsyncObject.html">AsyncObject</a></li><li><a href="module-utils.Bloom.html">Bloom</a></li><li><a href="module-utils.BufferReader.html">BufferReader</a></li><li><a href="module-utils.BufferWriter.html">BufferWriter</a></li><li><a href="module-utils.List.html">List</a></li><li><a href="module-utils.ListItem.html">ListItem</a></li><li><a href="module-utils.Lock.html">Lock</a></li><li><a href="module-utils.LRU.html">LRU</a></li><li><a href="module-utils.LRUBatch.html">LRUBatch</a></li><li><a href="module-utils.LRUItem.html">LRUItem</a></li><li><a href="module-utils.LRUOp.html">LRUOp</a></li><li><a href="module-utils.Map.html">Map</a></li><li><a href="module-utils.MappedLock.html">MappedLock</a></li><li><a href="module-utils.RollingFilter.html">RollingFilter</a></li><li><a href="module-utils.StaticWriter.html">StaticWriter</a></li><li><a href="module-utils_ip.Address.html">Address</a></li><li><a href="module-utils_protobuf-ProtoReader.html">ProtoReader</a></li><li><a href="module-utils_protobuf-ProtoWriter.html">ProtoWriter</a></li><li><a href="module-wallet.Account.html">Account</a></li><li><a href="module-wallet.Balance.html">Balance</a></li><li><a href="module-wallet.BlockRecord.html">BlockRecord</a></li><li><a href="module-wallet.ChainState.html">ChainState</a></li><li><a href="module-wallet.Credit.html">Credit</a></li><li><a href="module-wallet.Details.html">Details</a></li><li><a href="module-wallet.DetailsMember.html">DetailsMember</a></li><li><a href="module-wallet.MasterKey.html">MasterKey</a></li><li><a href="module-wallet.Path.html">Path</a></li><li><a href="module-wallet.TXDB.html">TXDB</a></li><li><a href="module-wallet.Wallet.html">Wallet</a></li><li><a href="module-wallet.WalletClient.html">WalletClient</a></li><li><a href="module-wallet.WalletDB.html">WalletDB</a></li><li><a href="module-wallet.WalletKey.html">WalletKey</a></li><li><a href="module-wallet.WalletOptions.html">WalletOptions</a></li><li><a href="module-wallet_records-BlockMapRecord.html">BlockMapRecord</a></li><li><a href="module-wallet_records-BlockMeta.html">BlockMeta</a></li><li><a href="module-wallet_records-ChainState.html">ChainState</a></li><li><a href="module-wallet_records-OutpointMapRecord.html">OutpointMapRecord</a></li><li><a href="module-wallet_records-PathMapRecord.html">PathMapRecord</a></li><li><a href="module-wallet_records-TXMapRecord.html">TXMapRecord</a></li><li><a href="module-wallet_records-TXRecord.html">TXRecord</a></li><li><a href="module-workers.Framer.html">Framer</a></li><li><a href="module-workers.Master.html">Master</a></li><li><a href="module-workers.Parser.html">Parser</a></li><li><a href="module-workers.ParserClient.html">ParserClient</a></li><li><a href="module-workers.Worker.html">Worker</a></li><li><a href="module-workers.WorkerPool.html">WorkerPool</a></li><li><a href="module-workers_packets-ECSignPacket.html">ECSignPacket</a></li><li><a href="module-workers_packets-ECSignResultPacket.html">ECSignResultPacket</a></li><li><a href="module-workers_packets-ECVerifyPacket.html">ECVerifyPacket</a></li><li><a href="module-workers_packets-ECVerifyResultPacket.html">ECVerifyResultPacket</a></li><li><a href="module-workers_packets-ErrorPacket.html">ErrorPacket</a></li><li><a href="module-workers_packets-ErrorResultPacket.html">ErrorResultPacket</a></li><li><a href="module-workers_packets-EventPacket.html">EventPacket</a></li><li><a href="module-workers_packets-LogPacket.html">LogPacket</a></li><li><a href="module-workers_packets-MinePacket.html">MinePacket</a></li><li><a href="module-workers_packets-MineResultPacket.html">MineResultPacket</a></li><li><a href="module-workers_packets-Packet.html">Packet</a></li><li><a href="module-workers_packets-ScryptPacket.html">ScryptPacket</a></li><li><a href="module-workers_packets-ScryptResultPacket.html">ScryptResultPacket</a></li><li><a href="module-workers_packets-SignInputPacket.html">SignInputPacket</a></li><li><a href="module-workers_packets-SignInputResultPacket.html">SignInputResultPacket</a></li><li><a href="module-workers_packets-SignPacket.html">SignPacket</a></li><li><a href="module-workers_packets-SignResultPacket.html">SignResultPacket</a></li><li><a href="module-workers_packets-VerifyInputPacket.html">VerifyInputPacket</a></li><li><a href="module-workers_packets-VerifyInputResultPacket.html">VerifyInputResultPacket</a></li><li><a href="module-workers_packets-VerifyPacket.html">VerifyPacket</a></li><li><a href="module-workers_packets-VerifyResultPacket.html">VerifyResultPacket</a></li></ul><h3>Namespaces</h3><ul><li><a href="module-crypto_pk.ecdsa.html">ecdsa</a></li><li><a href="module-crypto_pk.rsa.html">rsa</a></li></ul><h3>Global</h3><ul><li><a href="global.html"></a></li><li><a href="global.html#DoubleMap">DoubleMap</a></li><li><a href="global.html#StatEntry">StatEntry</a></li></ul>
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