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Copy pathEncoder.ts
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402 lines (352 loc) · 10.4 KB
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import { utf8EncodeJs, utf8Count, TEXT_ENCODER_THRESHOLD, utf8EncodeTE } from "./utils/utf8";
import { ExtensionCodec, ExtensionCodecType } from "./ExtensionCodec";
import { setInt64, setUint64 } from "./utils/int";
import { ensureUint8Array } from "./utils/typedArrays";
import { ExtData } from "./ExtData";
export const DEFAULT_MAX_DEPTH = 100;
export const DEFAULT_INITIAL_BUFFER_SIZE = 2048;
export class Encoder<ContextType> {
private pos = 0;
private view = new DataView(new ArrayBuffer(this.initialBufferSize));
private bytes = new Uint8Array(this.view.buffer);
public constructor(
private readonly extensionCodec: ExtensionCodecType<ContextType> = ExtensionCodec.defaultCodec as any,
private readonly context: ContextType = undefined as any,
private readonly maxDepth = DEFAULT_MAX_DEPTH,
private readonly initialBufferSize = DEFAULT_INITIAL_BUFFER_SIZE,
private readonly sortKeys = false,
private readonly forceFloat32 = false,
private readonly ignoreUndefined = false,
private readonly forceIntegerToFloat = false,
) {}
private getUint8Array(): Uint8Array {
return this.bytes.subarray(0, this.pos);
}
private reinitializeState() {
this.pos = 0;
}
public encode(object: unknown): Uint8Array {
this.reinitializeState();
this.doEncode(object, 1);
return this.getUint8Array();
}
private doEncode(object: unknown, depth: number): void {
if (depth > this.maxDepth) {
throw new Error(`Too deep objects in depth ${depth}`);
}
if (object == null) {
this.encodeNil();
} else if (typeof object === "boolean") {
this.encodeBoolean(object);
} else if (typeof object === "number") {
this.encodeNumber(object);
} else if (typeof object === "string") {
this.encodeString(object);
} else {
this.encodeObject(object, depth);
}
}
private ensureBufferSizeToWrite(sizeToWrite: number) {
const requiredSize = this.pos + sizeToWrite;
if (this.view.byteLength < requiredSize) {
this.resizeBuffer(requiredSize * 2);
}
}
private resizeBuffer(newSize: number) {
const newBuffer = new ArrayBuffer(newSize);
const newBytes = new Uint8Array(newBuffer);
const newView = new DataView(newBuffer);
newBytes.set(this.bytes);
this.view = newView;
this.bytes = newBytes;
}
private encodeNil() {
this.writeU8(0xc0);
}
private encodeBoolean(object: boolean) {
if (object === false) {
this.writeU8(0xc2);
} else {
this.writeU8(0xc3);
}
}
private encodeNumber(object: number) {
if (Number.isSafeInteger(object) && !this.forceIntegerToFloat) {
if (object >= 0) {
if (object < 0x80) {
// positive fixint
this.writeU8(object);
} else if (object < 0x100) {
// uint 8
this.writeU8(0xcc);
this.writeU8(object);
} else if (object < 0x10000) {
// uint 16
this.writeU8(0xcd);
this.writeU16(object);
} else if (object < 0x100000000) {
// uint 32
this.writeU8(0xce);
this.writeU32(object);
} else {
// uint 64
this.writeU8(0xcf);
this.writeU64(object);
}
} else {
if (object >= -0x20) {
// nagative fixint
this.writeU8(0xe0 | (object + 0x20));
} else if (object >= -0x80) {
// int 8
this.writeU8(0xd0);
this.writeI8(object);
} else if (object >= -0x8000) {
// int 16
this.writeU8(0xd1);
this.writeI16(object);
} else if (object >= -0x80000000) {
// int 32
this.writeU8(0xd2);
this.writeI32(object);
} else {
// int 64
this.writeU8(0xd3);
this.writeI64(object);
}
}
} else {
// non-integer numbers
if (this.forceFloat32) {
// float 32
this.writeU8(0xca);
this.writeF32(object);
} else {
// float 64
this.writeU8(0xcb);
this.writeF64(object);
}
}
}
private writeStringHeader(byteLength: number) {
if (byteLength < 32) {
// fixstr
this.writeU8(0xa0 + byteLength);
} else if (byteLength < 0x100) {
// str 8
this.writeU8(0xd9);
this.writeU8(byteLength);
} else if (byteLength < 0x10000) {
// str 16
this.writeU8(0xda);
this.writeU16(byteLength);
} else if (byteLength < 0x100000000) {
// str 32
this.writeU8(0xdb);
this.writeU32(byteLength);
} else {
throw new Error(`Too long string: ${byteLength} bytes in UTF-8`);
}
}
private encodeString(object: string) {
const maxHeaderSize = 1 + 4;
const strLength = object.length;
if (strLength > TEXT_ENCODER_THRESHOLD) {
const byteLength = utf8Count(object);
this.ensureBufferSizeToWrite(maxHeaderSize + byteLength);
this.writeStringHeader(byteLength);
utf8EncodeTE(object, this.bytes, this.pos);
this.pos += byteLength;
} else {
const byteLength = utf8Count(object);
this.ensureBufferSizeToWrite(maxHeaderSize + byteLength);
this.writeStringHeader(byteLength);
utf8EncodeJs(object, this.bytes, this.pos);
this.pos += byteLength;
}
}
private encodeObject(object: unknown, depth: number) {
// try to encode objects with custom codec first of non-primitives
const ext = this.extensionCodec.tryToEncode(object, this.context);
if (ext != null) {
this.encodeExtension(ext);
} else if (Array.isArray(object)) {
this.encodeArray(object, depth);
} else if (ArrayBuffer.isView(object)) {
this.encodeBinary(object);
} else if (typeof object === "object") {
this.encodeMap(object as Record<string, unknown>, depth);
} else {
// symbol, function and other special object come here unless extensionCodec handles them.
throw new Error(`Unrecognized object: ${Object.prototype.toString.apply(object)}`);
}
}
private encodeBinary(object: ArrayBufferView) {
const size = object.byteLength;
if (size < 0x100) {
// bin 8
this.writeU8(0xc4);
this.writeU8(size);
} else if (size < 0x10000) {
// bin 16
this.writeU8(0xc5);
this.writeU16(size);
} else if (size < 0x100000000) {
// bin 32
this.writeU8(0xc6);
this.writeU32(size);
} else {
throw new Error(`Too large binary: ${size}`);
}
const bytes = ensureUint8Array(object);
this.writeU8a(bytes);
}
private encodeArray(object: Array<unknown>, depth: number) {
const size = object.length;
if (size < 16) {
// fixarray
this.writeU8(0x90 + size);
} else if (size < 0x10000) {
// array 16
this.writeU8(0xdc);
this.writeU16(size);
} else if (size < 0x100000000) {
// array 32
this.writeU8(0xdd);
this.writeU32(size);
} else {
throw new Error(`Too large array: ${size}`);
}
for (const item of object) {
this.doEncode(item, depth + 1);
}
}
private countWithoutUndefined(object: Record<string, unknown>, keys: ReadonlyArray<string>): number {
let count = 0;
for (const key of keys) {
if (object[key] !== undefined) {
count++;
}
}
return count;
}
private encodeMap(object: Record<string, unknown>, depth: number) {
const keys = Object.keys(object);
if (this.sortKeys) {
keys.sort();
}
const size = this.ignoreUndefined ? this.countWithoutUndefined(object, keys) : keys.length;
if (size < 16) {
// fixmap
this.writeU8(0x80 + size);
} else if (size < 0x10000) {
// map 16
this.writeU8(0xde);
this.writeU16(size);
} else if (size < 0x100000000) {
// map 32
this.writeU8(0xdf);
this.writeU32(size);
} else {
throw new Error(`Too large map object: ${size}`);
}
for (const key of keys) {
const value = object[key];
if (!(this.ignoreUndefined && value === undefined)) {
this.encodeString(key);
this.doEncode(value, depth + 1);
}
}
}
private encodeExtension(ext: ExtData) {
const size = ext.data.length;
if (size === 1) {
// fixext 1
this.writeU8(0xd4);
} else if (size === 2) {
// fixext 2
this.writeU8(0xd5);
} else if (size === 4) {
// fixext 4
this.writeU8(0xd6);
} else if (size === 8) {
// fixext 8
this.writeU8(0xd7);
} else if (size === 16) {
// fixext 16
this.writeU8(0xd8);
} else if (size < 0x100) {
// ext 8
this.writeU8(0xc7);
this.writeU8(size);
} else if (size < 0x10000) {
// ext 16
this.writeU8(0xc8);
this.writeU16(size);
} else if (size < 0x100000000) {
// ext 32
this.writeU8(0xc9);
this.writeU32(size);
} else {
throw new Error(`Too large extension object: ${size}`);
}
this.writeI8(ext.type);
this.writeU8a(ext.data);
}
private writeU8(value: number) {
this.ensureBufferSizeToWrite(1);
this.view.setUint8(this.pos, value);
this.pos++;
}
private writeU8a(values: ArrayLike<number>) {
const size = values.length;
this.ensureBufferSizeToWrite(size);
this.bytes.set(values, this.pos);
this.pos += size;
}
private writeI8(value: number) {
this.ensureBufferSizeToWrite(1);
this.view.setInt8(this.pos, value);
this.pos++;
}
private writeU16(value: number) {
this.ensureBufferSizeToWrite(2);
this.view.setUint16(this.pos, value);
this.pos += 2;
}
private writeI16(value: number) {
this.ensureBufferSizeToWrite(2);
this.view.setInt16(this.pos, value);
this.pos += 2;
}
private writeU32(value: number) {
this.ensureBufferSizeToWrite(4);
this.view.setUint32(this.pos, value);
this.pos += 4;
}
private writeI32(value: number) {
this.ensureBufferSizeToWrite(4);
this.view.setInt32(this.pos, value);
this.pos += 4;
}
private writeF32(value: number) {
this.ensureBufferSizeToWrite(4);
this.view.setFloat32(this.pos, value);
this.pos += 4;
}
private writeF64(value: number) {
this.ensureBufferSizeToWrite(8);
this.view.setFloat64(this.pos, value);
this.pos += 8;
}
private writeU64(value: number) {
this.ensureBufferSizeToWrite(8);
setUint64(this.view, this.pos, value);
this.pos += 8;
}
private writeI64(value: number) {
this.ensureBufferSizeToWrite(8);
setInt64(this.view, this.pos, value);
this.pos += 8;
}
}
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