writer: improve perf.
This commit is contained in:
Christopher Jeffrey
parent
0bf9828f03
commit
7f5e0cb493
@ -63,7 +63,7 @@ function BufferWriter(options) {
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if (!(this instanceof BufferWriter))
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return new BufferWriter(options);
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this.data = [];
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this.ops = [];
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this.written = 0;
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}
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@ -76,40 +76,40 @@ function BufferWriter(options) {
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BufferWriter.prototype.render = function render(keep) {
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var data = new Buffer(this.written);
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var off = 0;
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var i, item;
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var i, op;
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for (i = 0; i < this.data.length; i++) {
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item = this.data[i];
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switch (item[0]) {
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case SEEK: off += item[1]; break;
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case UI8: off = data.writeUInt8(item[1], off, true); break;
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case UI16: off = data.writeUInt16LE(item[1], off, true); break;
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case UI16BE: off = data.writeUInt16BE(item[1], off, true); break;
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case UI32: off = data.writeUInt32LE(item[1], off, true); break;
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case UI32BE: off = data.writeUInt32BE(item[1], off, true); break;
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case UI64: off = encoding.writeU64(data, item[1], off); break;
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case UI64BE: off = encoding.writeU64BE(data, item[1], off); break;
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case I8: off = data.writeInt8(item[1], off, true); break;
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case I16: off = data.writeInt16LE(item[1], off, true); break;
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case I16BE: off = data.writeInt16BE(item[1], off, true); break;
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case I32: off = data.writeInt32LE(item[1], off, true); break;
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case I32BE: off = data.writeInt32BE(item[1], off, true); break;
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case I64: off = encoding.write64(data, item[1], off); break;
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case I64BE: off = encoding.write64BE(data, item[1], off); break;
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case FL: off = data.writeFloatLE(item[1], off, true); break;
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case FLBE: off = data.writeFloatBE(item[1], off, true); break;
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case DBL: off = data.writeDoubleLE(item[1], off, true); break;
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case DBLBE: off = data.writeDoubleBE(item[1], off, true); break;
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case VARINT: off = encoding.writeVarint(data, item[1], off); break;
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case VARINT2: off = encoding.writeVarint2(data, item[1], off); break;
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case BYTES: off += item[1].copy(data, off); break;
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case STR: off += data.write(item[1], off, item[2]); break;
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for (i = 0; i < this.ops.length; i++) {
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op = this.ops[i];
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switch (op.type) {
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case SEEK: off += op.value; break;
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case UI8: off = data.writeUInt8(op.value, off, true); break;
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case UI16: off = data.writeUInt16LE(op.value, off, true); break;
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case UI16BE: off = data.writeUInt16BE(op.value, off, true); break;
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case UI32: off = data.writeUInt32LE(op.value, off, true); break;
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case UI32BE: off = data.writeUInt32BE(op.value, off, true); break;
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case UI64: off = encoding.writeU64(data, op.value, off); break;
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case UI64BE: off = encoding.writeU64BE(data, op.value, off); break;
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case I8: off = data.writeInt8(op.value, off, true); break;
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case I16: off = data.writeInt16LE(op.value, off, true); break;
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case I16BE: off = data.writeInt16BE(op.value, off, true); break;
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case I32: off = data.writeInt32LE(op.value, off, true); break;
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case I32BE: off = data.writeInt32BE(op.value, off, true); break;
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case I64: off = encoding.write64(data, op.value, off); break;
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case I64BE: off = encoding.write64BE(data, op.value, off); break;
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case FL: off = data.writeFloatLE(op.value, off, true); break;
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case FLBE: off = data.writeFloatBE(op.value, off, true); break;
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case DBL: off = data.writeDoubleLE(op.value, off, true); break;
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case DBLBE: off = data.writeDoubleBE(op.value, off, true); break;
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case VARINT: off = encoding.writeVarint(data, op.value, off); break;
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case VARINT2: off = encoding.writeVarint2(data, op.value, off); break;
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case BYTES: off += op.value.copy(data, off); break;
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case STR: off += data.write(op.value, off, op.enc); break;
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case CHECKSUM:
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off += crypto.hash256(data.slice(0, off)).copy(data, off, 0, 4);
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break;
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case FILL:
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data.fill(item[1], off, off + item[2]);
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off += item[2];
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data.fill(op.value, off, off + op.size);
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off += op.size;
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break;
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default:
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assert(false, 'Bad type.');
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@ -140,16 +140,17 @@ BufferWriter.prototype.getSize = function getSize() {
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*/
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BufferWriter.prototype.seek = function seek(offset) {
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this.data.push([SEEK, offset]);
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this.written += offset;
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this.ops.push(new WriteOp(SEEK, offset));
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};
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/**
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* Destroy the buffer writer. Remove references to `data`.
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* Destroy the buffer writer. Remove references to `ops`.
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*/
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BufferWriter.prototype.destroy = function destroy() {
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this.data.length = 0;
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this.data = null;
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this.ops.length = 0;
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this.ops = null;
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this.written = null;
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};
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@ -160,7 +161,7 @@ BufferWriter.prototype.destroy = function destroy() {
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BufferWriter.prototype.writeU8 = function writeU8(value) {
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this.written += 1;
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this.data.push([UI8, value]);
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this.ops.push(new WriteOp(UI8, value));
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};
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/**
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@ -170,7 +171,7 @@ BufferWriter.prototype.writeU8 = function writeU8(value) {
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BufferWriter.prototype.writeU16 = function writeU16(value) {
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this.written += 2;
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this.data.push([UI16, value]);
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this.ops.push(new WriteOp(UI16, value));
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};
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/**
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@ -180,7 +181,7 @@ BufferWriter.prototype.writeU16 = function writeU16(value) {
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BufferWriter.prototype.writeU16BE = function writeU16BE(value) {
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this.written += 2;
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this.data.push([UI16BE, value]);
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this.ops.push(new WriteOp(UI16BE, value));
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};
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/**
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@ -190,7 +191,7 @@ BufferWriter.prototype.writeU16BE = function writeU16BE(value) {
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BufferWriter.prototype.writeU32 = function writeU32(value) {
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this.written += 4;
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this.data.push([UI32, value]);
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this.ops.push(new WriteOp(UI32, value));
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};
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/**
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@ -200,7 +201,7 @@ BufferWriter.prototype.writeU32 = function writeU32(value) {
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BufferWriter.prototype.writeU32BE = function writeU32BE(value) {
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this.written += 4;
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this.data.push([UI32BE, value]);
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this.ops.push(new WriteOp(UI32BE, value));
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};
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/**
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@ -210,7 +211,7 @@ BufferWriter.prototype.writeU32BE = function writeU32BE(value) {
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BufferWriter.prototype.writeU64 = function writeU64(value) {
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this.written += 8;
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this.data.push([UI64, value]);
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this.ops.push(new WriteOp(UI64, value));
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};
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/**
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@ -220,7 +221,7 @@ BufferWriter.prototype.writeU64 = function writeU64(value) {
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BufferWriter.prototype.writeU64BE = function writeU64BE(value) {
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this.written += 8;
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this.data.push([UI64BE, value]);
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this.ops.push(new WriteOp(UI64BE, value));
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};
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/**
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@ -230,7 +231,7 @@ BufferWriter.prototype.writeU64BE = function writeU64BE(value) {
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BufferWriter.prototype.write8 = function write8(value) {
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this.written += 1;
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this.data.push([I8, value]);
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this.ops.push(new WriteOp(I8, value));
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};
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/**
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@ -240,7 +241,7 @@ BufferWriter.prototype.write8 = function write8(value) {
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BufferWriter.prototype.write16 = function write16(value) {
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this.written += 2;
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this.data.push([I16, value]);
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this.ops.push(new WriteOp(I16, value));
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};
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/**
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@ -250,7 +251,7 @@ BufferWriter.prototype.write16 = function write16(value) {
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BufferWriter.prototype.write16BE = function write16BE(value) {
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this.written += 2;
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this.data.push([I16BE, value]);
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this.ops.push(new WriteOp(I16BE, value));
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};
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/**
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@ -260,7 +261,7 @@ BufferWriter.prototype.write16BE = function write16BE(value) {
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BufferWriter.prototype.write32 = function write32(value) {
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this.written += 4;
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this.data.push([I32, value]);
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this.ops.push(new WriteOp(I32, value));
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};
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/**
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@ -270,7 +271,7 @@ BufferWriter.prototype.write32 = function write32(value) {
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BufferWriter.prototype.write32BE = function write32BE(value) {
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this.written += 4;
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this.data.push([I32BE, value]);
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this.ops.push(new WriteOp(I32BE, value));
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};
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/**
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@ -280,7 +281,7 @@ BufferWriter.prototype.write32BE = function write32BE(value) {
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BufferWriter.prototype.write64 = function write64(value) {
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this.written += 8;
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this.data.push([I64, value]);
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this.ops.push(new WriteOp(I64, value));
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};
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/**
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@ -290,7 +291,7 @@ BufferWriter.prototype.write64 = function write64(value) {
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BufferWriter.prototype.write64BE = function write64BE(value) {
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this.written += 8;
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this.data.push([I64BE, value]);
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this.ops.push(new WriteOp(I64BE, value));
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};
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/**
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@ -300,7 +301,7 @@ BufferWriter.prototype.write64BE = function write64BE(value) {
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BufferWriter.prototype.writeFloat = function writeFloat(value) {
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this.written += 4;
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this.data.push([FL, value]);
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this.ops.push(new WriteOp(FL, value));
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};
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/**
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@ -310,7 +311,7 @@ BufferWriter.prototype.writeFloat = function writeFloat(value) {
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BufferWriter.prototype.writeFloatBE = function writeFloatBE(value) {
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this.written += 4;
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this.data.push([FLBE, value]);
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this.ops.push(new WriteOp(FLBE, value));
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};
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/**
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@ -320,7 +321,7 @@ BufferWriter.prototype.writeFloatBE = function writeFloatBE(value) {
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BufferWriter.prototype.writeDouble = function writeDouble(value) {
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this.written += 8;
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this.data.push([DBL, value]);
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this.ops.push(new WriteOp(DBL, value));
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};
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/**
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@ -330,7 +331,7 @@ BufferWriter.prototype.writeDouble = function writeDouble(value) {
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BufferWriter.prototype.writeDoubleBE = function writeDoubleBE(value) {
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this.written += 8;
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this.data.push([DBLBE, value]);
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this.ops.push(new WriteOp(DBLBE, value));
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};
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/**
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@ -345,7 +346,7 @@ BufferWriter.prototype.writeVarint = function writeVarint(value) {
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assert(!value.isNeg());
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this.written += encoding.sizeVarint(value);
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this.data.push([VARINT, value]);
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this.ops.push(new WriteOp(VARINT, value));
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};
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/**
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@ -360,7 +361,7 @@ BufferWriter.prototype.writeVarint2 = function writeVarint2(value) {
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assert(!value.isNeg());
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this.written += encoding.sizeVarint2(value);
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this.data.push([VARINT2, value]);
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this.ops.push(new WriteOp(VARINT2, value));
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};
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/**
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@ -369,8 +370,11 @@ BufferWriter.prototype.writeVarint2 = function writeVarint2(value) {
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*/
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BufferWriter.prototype.writeBytes = function writeBytes(value) {
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if (value.length === 0)
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return;
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this.written += value.length;
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this.data.push([BYTES, value]);
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this.ops.push(new WriteOp(BYTES, value));
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};
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/**
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@ -380,9 +384,13 @@ BufferWriter.prototype.writeBytes = function writeBytes(value) {
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BufferWriter.prototype.writeVarBytes = function writeVarBytes(value) {
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this.written += encoding.sizeVarint(value.length);
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this.ops.push(new WriteOp(VARINT, value.length));
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if (value.length === 0)
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return;
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this.written += value.length;
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this.data.push([VARINT, value.length]);
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this.data.push([BYTES, value]);
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this.ops.push(new WriteOp(BYTES, value));
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};
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/**
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@ -400,7 +408,7 @@ BufferWriter.prototype.writeString = function writeString(value, enc) {
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if (value.length === 0)
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return;
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this.data.push([STR, value, enc]);
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this.ops.push(new WriteOp(STR, value, enc));
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};
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/**
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@ -429,12 +437,12 @@ BufferWriter.prototype.writeVarString = function writeVarString(value, enc) {
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this.written += encoding.sizeVarint(size);
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this.written += size;
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this.data.push([VARINT, size]);
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this.ops.push(new WriteOp(VARINT, size));
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if (value.length === 0)
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return;
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this.data.push([STR, value, enc]);
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this.ops.push(new WriteOp(STR, value, enc));
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};
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/**
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@ -454,7 +462,7 @@ BufferWriter.prototype.writeNullString = function writeNullString(value, enc) {
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BufferWriter.prototype.writeChecksum = function writeChecksum() {
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this.written += 4;
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this.data.push([CHECKSUM]);
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this.ops.push(new WriteOp(CHECKSUM));
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};
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/**
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@ -470,9 +478,20 @@ BufferWriter.prototype.fill = function fill(value, size) {
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return;
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this.written += size;
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this.data.push([FILL, value, size]);
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this.ops.push(new WriteOp(FILL, value, null, size));
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};
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/*
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* Helpers
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*/
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function WriteOp(type, value, enc, size) {
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this.type = type;
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this.value = value;
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this.enc = enc;
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this.size = size;
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}
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/*
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* Expose
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*/
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