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import {CONST, MAJOR_OVERLAY} from './constants';
import type {IWriter, IWriterGrowable} from '@jsonjoy.com/buffers/lib';
import type {BinaryJsonEncoder, StreamingBinaryJsonEncoder, TlvBinaryJsonEncoder} from '../types';
const isSafeInteger = Number.isSafeInteger;
/**
* Fast CBOR encoder supports only JSON values. Use regular `CborEncoder` if
* you need ability to encode all CBOR value types.
*/
export class CborEncoderFast<W extends IWriter & IWriterGrowable = IWriter & IWriterGrowable>
implements BinaryJsonEncoder, StreamingBinaryJsonEncoder, TlvBinaryJsonEncoder
{
constructor(public readonly writer: W = new Writer() as any) {}
public encode(value: unknown): Uint8Array {
this.writeAny(value);
return this.writer.flush();
}
public writeAny(value: unknown): void {
switch (typeof value) {
case 'number':
return this.writeNumber(value as number);
case 'string':
return this.writeStr(value);
case 'boolean':
return this.writer.u8(0xf4 + +value);
case 'object': {
if (!value) return this.writer.u8(0xf6);
const constr = value.constructor;
switch (constr) {
case Array:
return this.writeArr(value as unknown[]);
default:
return this.writeObj(value as Record<string, unknown>);
}
}
}
}
public writeCbor(): void {
this.writer.u8u16(0xd9, 0xd9f7);
}
public writeEnd(): void {
this.writer.u8(CONST.END);
}
public writeNull(): void {
this.writer.u8(0xf6);
}
public writeBoolean(bool: boolean): void {
if (bool) this.writer.u8(0xf5);
else this.writer.u8(0xf4);
}
public writeNumber(num: number): void {
if (isSafeInteger(num)) this.writeInteger(num);
else Iif (typeof num === 'bigint') this.writeBigInt(num);
else this.writeFloat(num);
}
public writeBigInt(int: bigint): void {
if (int >= 0) this.writeBigUint(int);
else this.writeBigSint(int);
}
public writeBigUint(uint: bigint): void {
if (uint <= Number.MAX_SAFE_INTEGER) return this.writeUInteger(Number(uint));
this.writer.u8u64(0x1b, uint);
}
public writeBigSint(int: bigint): void {
if (int >= Number.MIN_SAFE_INTEGER) return this.encodeNint(Number(int));
const uint = -BigInt(1) - int;
this.writer.u8u64(0x3b, uint);
}
public writeInteger(int: number): void {
if (int >= 0) this.writeUInteger(int);
else this.encodeNint(int);
}
public writeUInteger(uint: number): void {
const writer = this.writer;
writer.ensureCapacity(9);
const uint8 = writer.uint8;
let x = writer.x;
if (uint <= 23) {
uint8[x++] = MAJOR_OVERLAY.UIN + uint;
} else if (uint <= 0xff) {
uint8[x++] = 0x18;
uint8[x++] = uint;
} else if (uint <= 0xffff) {
uint8[x++] = 0x19;
writer.view.setUint16(x, uint);
x += 2;
} else if (uint <= 0xffffffff) {
uint8[x++] = 0x1a;
writer.view.setUint32(x, uint);
x += 4;
} else {
uint8[x++] = 0x1b;
writer.view.setBigUint64(x, BigInt(uint));
x += 8;
}
writer.x = x;
}
/** @deprecated Remove and use `writeNumber` instead. */
public encodeNumber(num: number): void {
this.writeNumber(num);
}
/** @deprecated Remove and use `writeInteger` instead. */
public encodeInteger(int: number): void {
this.writeInteger(int);
}
/** @deprecated */
public encodeUint(uint: number): void {
this.writeUInteger(uint);
}
public encodeNint(int: number): void {
const uint = -1 - int;
const writer = this.writer;
writer.ensureCapacity(9);
const uint8 = writer.uint8;
let x = writer.x;
if (uint < 24) {
uint8[x++] = MAJOR_OVERLAY.NIN + uint;
} else if (uint <= 0xff) {
uint8[x++] = 0x38;
uint8[x++] = uint;
} else if (uint <= 0xffff) {
uint8[x++] = 0x39;
writer.view.setUint16(x, uint);
x += 2;
} else if (uint <= 0xffffffff) {
uint8[x++] = 0x3a;
writer.view.setUint32(x, uint);
x += 4;
} else {
uint8[x++] = 0x3b;
writer.view.setBigUint64(x, BigInt(uint));
x += 8;
}
writer.x = x;
}
public writeFloat(float: number): void {
this.writer.u8f64(0xfb, float);
}
public writeBin(buf: Uint8Array): void {
const length = buf.length;
this.writeBinHdr(length);
this.writer.buf(buf, length);
}
public writeBinHdr(length: number): void {
const writer = this.writer;
if (length <= 23) writer.u8(MAJOR_OVERLAY.BIN + length);
else if (length <= 0xff) writer.u16((0x58 << 8) + length);
else if (length <= 0xffff) writer.u8u16(0x59, length);
else if (length <= 0xffffffff) writer.u8u32(0x5a, length);
else Ewriter.u8u64(0x5b, length);
}
public writeStr(str: string): void {
const writer = this.writer;
const length = str.length;
const maxSize = length * 4;
writer.ensureCapacity(5 + maxSize);
const uint8 = writer.uint8;
let lengthOffset: number = writer.x;
if (maxSize <= 23) writer.x++;
else if (maxSize <= 0xff) {
uint8[writer.x++] = 0x78;
lengthOffset = writer.x;
writer.x++;
} else if (maxSize <= 0xffff) {
uint8[writer.x++] = 0x79;
lengthOffset = writer.x;
writer.x += 2;
} else {
uint8[writer.x++] = 0x7a;
lengthOffset = writer.x;
writer.x += 4;
}
const bytesWritten = writer.utf8(str);
if (maxSize <= 23) uint8[lengthOffset] = MAJOR_OVERLAY.STR + bytesWritten;
else if (maxSize <= 0xff) uint8[lengthOffset] = bytesWritten;
else if (maxSize <= 0xffff) writer.view.setUint16(lengthOffset, bytesWritten);
else writer.view.setUint32(lengthOffset, bytesWritten);
}
public writeStrHdr(length: number): void {
const writer = this.writer;
if (length <= 23) writer.u8(MAJOR_OVERLAY.STR + length);
else if (length <= 0xff) writer.u16((0x78 << 8) + length);
else if (length <= 0xffff) writer.u8u16(0x79, length);
else writer.u8u32(0x7a, length);
}
public writeAsciiStr(str: string): void {
this.writeStrHdr(str.length);
this.writer.ascii(str);
}
public writeArr(arr: unknown[]): void {
const length = arr.length;
this.writeArrHdr(length);
for (let i = 0; i < length; i++) this.writeAny(arr[i]);
}
public writeArrHdr(length: number): void {
const writer = this.writer;
if (length <= 23) writer.u8(MAJOR_OVERLAY.ARR + length);
else if (length <= 0xff) writer.u16((0x98 << 8) + length);
else if (length <= 0xffff) writer.u8u16(0x99, length);
else if (length <= 0xffffffff) writer.u8u32(0x9a, length);
else Ewriter.u8u64(0x9b, length);
}
public writeObj(obj: Record<string, unknown>): void {
const keys = Object.keys(obj);
const length = keys.length;
this.writeObjHdr(length);
for (let i = 0; i < length; i++) {
const key = keys[i];
this.writeStr(key);
this.writeAny(obj[key]);
}
}
public writeObjHdr(length: number): void {
const writer = this.writer;
if (length <= 23) writer.u8(MAJOR_OVERLAY.MAP + length);
else if (length <= 0xff) writer.u16((0xb8 << 8) + length);
else if (length <= 0xffff) writer.u8u16(0xb9, length);
else Eif (length <= 0xffffffff) writer.u8u32(0xba, length);
else writer.u8u64(0xbb, length);
}
public writeMapHdr(length: number): void {
this.writeObjHdr(length);
}
public writeStartMap(): void {
this.writer.u8(0xbf);
}
public writeTag(tag: number, value: unknown): void {
this.writeTagHdr(tag);
this.writeAny(value);
}
public writeTagHdr(tag: number): void {
const writer = this.writer;
if (tag <= 23) writer.u8(MAJOR_OVERLAY.TAG + tag);
else if (tag <= 0xff) writer.u16((0xd8 << 8) + tag);
else Eif (tag <= 0xffff) writer.u8u16(0xd9, tag);
else if (tag <= 0xffffffff) writer.u8u32(0xda, tag);
else writer.u8u64(0xdb, tag);
}
public writeTkn(value: number): void {
const writer = this.writer;
if (value <= 23) writer.u8(MAJOR_OVERLAY.TKN + value);
else Eif (value <= 0xff) writer.u16((0xf8 << 8) + value);
}
// ------------------------------------------------------- Streaming encoding
public writeStartStr(): void {
this.writer.u8(0x7f);
}
public writeStrChunk(str: string): void {
throw new Error('Not implemented');
}
public writeEndStr(): void {
throw new Error('Not implemented');
}
public writeStartBin(): void {
this.writer.u8(0x5f);
}
public writeBinChunk(buf: Uint8Array): void {
throw new Error('Not implemented');
}
public writeEndBin(): void {
throw new Error('Not implemented');
}
public writeStartArr(): void {
this.writer.u8(0x9f);
}
public writeArrChunk(item: unknown): void {
throw new Error('Not implemented');
}
public writeEndArr(): void {
this.writer.u8(CONST.END);
}
public writeStartObj(): void {
this.writer.u8(0xbf);
}
public writeObjChunk(key: string, value: unknown): void {
throw new Error('Not implemented');
}
public writeEndObj(): void {
this.writer.u8(CONST.END);
}
}
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