Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import {decodeF16} from '@jsonjoy.com/buffers/lib/f16';
import {JsonPackExtension} from '../JsonPackExtension';
import {JsonPackValue} from '../JsonPackValue';
import {Reader} from '@jsonjoy.com/buffers/lib/Reader';
import sharedCachedUtf8Decoder from '@jsonjoy.com/buffers/lib/utf8/sharedCachedUtf8Decoder';
import type {CachedUtf8Decoder} from '@jsonjoy.com/buffers/lib/utf8/CachedUtf8Decoder';
import type {IReader, IReaderResettable} from '@jsonjoy.com/buffers/lib';
import type {BinaryJsonDecoder, PackValue} from '../types';
export class CborDecoderBase<R extends IReader & IReaderResettable = IReader & IReaderResettable>
implements BinaryJsonDecoder
{
public constructor(
public reader: R = new Reader() as any,
public readonly keyDecoder: CachedUtf8Decoder = sharedCachedUtf8Decoder,
) {}
public read(uint8: Uint8Array): PackValue {
return this.decode(uint8) as PackValue;
}
public decode(uint8: Uint8Array): unknown {
this.reader.reset(uint8);
return this.readAny();
}
// -------------------------------------------------------- Any value reading
public val(): unknown {
return this.readAny();
}
public readAny(): unknown {
const reader = this.reader;
const octet = reader.u8();
const major = octet >> 5;
const minor = octet & CONST.MINOR_MASK;
if (major < MAJOR.ARR) {
if (major < MAJOR.BIN) return major === MAJOR.UIN ? this.readUint(minor) : this.readNint(minor);
else return major === MAJOR.BIN ? this.readBin(minor) : this.readStr(minor);
} else {
if (major < MAJOR.TAG) return major === MAJOR.ARR ? this.readArr(minor) : this.readObj(minor);
else return major === MAJOR.TAG ? this.readTag(minor) : this.readTkn(minor);
}
}
public readAnyRaw(octet: number): unknown {
const major = octet >> 5;
const minor = octet & CONST.MINOR_MASK;
if (major < MAJOR.ARR) {
if (major < MAJOR.BIN) return major === MAJOR.UIN ? this.readUint(minor) : this.readNint(minor);
else return major === MAJOR.BIN ? this.readBin(minor) : this.readStr(minor);
} else {
if (major < MAJOR.TAG) return major === MAJOR.ARR ? this.readArr(minor) : this.readObj(minor);
else return major === MAJOR.TAG ? this.readTag(minor) : this.readTkn(minor);
}
}
public readMinorLen(minor: number): number {
if (minor < 24) return minor;
switch (minor) {
case 24:
return this.reader.u8();
case 25:
return this.reader.u16();
case 26:
return this.reader.u32();
case 27:
return Number(this.reader.u64());
case 31:
return -1;
default:
throw ERROR.UNEXPECTED_MINOR;
}
}
// ----------------------------------------------------- Unsigned int reading
public readUint(minor: number): number | bigint {
if (minor < 25) {
return minor === 24 ? this.reader.u8() : minor;
} else {
if (minor < 27) {
return minor === 25 ? this.reader.u16() : this.reader.u32();
} else if (minor === 27) {
const num = this.reader.u64();
return num > CONST.MAX_UINT ? num : Number(num);
} else throw ERROR.UNEXPECTED_MINOR;
}
}
// ----------------------------------------------------- Negative int reading
public readNint(minor: number): number | bigint {
if (minor < 25) {
return minor === 24 ? -this.reader.u8() - 1 : -minor - 1;
} else {
if (minor < 27) {
return minor === 25 ? -this.reader.u16() - 1 : -this.reader.u32() - 1;
} else if (minor === 27) {
const num = this.reader.u64();
return num > CONST.MAX_UINT - 1 ? -num - BigInt(1) : -Number(num) - 1;
} else throw ERROR.UNEXPECTED_MINOR;
}
}
// ----------------------------------------------------------- Binary reading
public readBin(minor: number): Uint8Array {
const reader = this.reader;
if (minor <= 23) return reader.buf(minor);
switch (minor) {
case 24:
return reader.buf(reader.u8());
case 25:
return reader.buf(reader.u16());
case 26:
return reader.buf(reader.u32());
case 27:
return reader.buf(Number(reader.u64()));
case 31: {
let size = 0;
const list: Uint8Array[] = [];
while (this.reader.peak() !== CONST.END) {
const uint8 = this.readBinChunk();
size += uint8.length;
list.push(uint8);
}
this.reader.x++;
const res = new Uint8Array(size);
let offset = 0;
const length = list.length;
for (let i = 0; i < length; i++) {
const arr = list[i];
res.set(arr, offset);
offset += arr.length;
}
return res;
}
default:
throw ERROR.UNEXPECTED_MINOR;
}
}
public readBinChunk(): Uint8Array {
const octet = this.reader.u8();
const major = octet >> 5;
const minor = octet & CONST.MINOR_MASK;
if (major !== MAJOR.BIN) throw ERROR.UNEXPECTED_BIN_CHUNK_MAJOR;
if (minor > 27) throw ERROR.UNEXPECTED_BIN_CHUNK_MINOR;
return this.readBin(minor);
}
// ----------------------------------------------------------- String reading
public readAsStr(): string {
const reader = this.reader;
const octet = reader.u8();
const major = octet >> 5;
const minor = octet & CONST.MINOR_MASK;
if (major !== MAJOR.STR) throw ERROR.UNEXPECTED_STR_MAJOR;
return this.readStr(minor);
}
public readStr(minor: number): string {
const reader = this.reader;
if (minor <= 23) return reader.utf8(minor);
switch (minor) {
case 24:
return reader.utf8(reader.u8());
case 25:
return reader.utf8(reader.u16());
case 26:
return reader.utf8(reader.u32());
case 27:
return reader.utf8(Number(reader.u64()));
case 31: {
let str = '';
while (reader.peak() !== CONST.END) str += this.readStrChunk();
this.reader.x++;
return str;
}
default:
throw ERROR.UNEXPECTED_MINOR;
}
}
public readStrLen(minor: number): number {
if (minor <= 23) return minor;
switch (minor) {
case 24:
return this.reader.u8();
case 25:
return this.reader.u16();
case 26:
return this.reader.u32();
case 27:
return Number(this.reader.u64());
default:
throw ERROR.UNEXPECTED_MINOR;
}
}
public readStrChunk(): string {
const octet = this.reader.u8();
const major = octet >> 5;
const minor = octet & CONST.MINOR_MASK;
if (major !== MAJOR.STR) throw ERROR.UNEXPECTED_STR_CHUNK_MAJOR;
if (minor > 27) throw ERROR.UNEXPECTED_STR_CHUNK_MINOR;
return this.readStr(minor);
}
// ------------------------------------------------------------ Array reading
public readArr(minor: number): unknown[] {
const length = this.readMinorLen(minor);
if (length >= 0) return this.readArrRaw(length);
return this.readArrIndef();
}
public readArrRaw(length: number): unknown[] {
const arr: unknown[] = [];
for (let i = 0; i < length; i++) arr.push(this.readAny());
return arr;
}
public readArrIndef(): unknown[] {
const arr: unknown[] = [];
while (this.reader.peak() !== CONST.END) arr.push(this.readAny());
this.reader.x++;
return arr;
}
// ----------------------------------------------------------- Object reading
public readObj(minor: number): Record<string, unknown> {
if (minor < 28) {
let length = minor;
switch (minor) {
case 24:
length = this.reader.u8();
break;
case 25:
length = this.reader.u16();
break;
case 26:
length = this.reader.u32();
break;
case 27:
length = Number(this.reader.u64());
break;
}
const obj: Record<string, unknown> = {};
for (let i = 0; i < length; i++) {
const key = this.key();
if (key === '__proto__') throw ERROR.UNEXPECTED_OBJ_KEY;
const value = this.readAny();
obj[key] = value;
}
return obj;
} else if (minor === 31) return this.readObjIndef();
else throw ERROR.UNEXPECTED_MINOR;
}
/** Remove this? */
public readObjRaw(length: number): Record<string, unknown> {
const obj: Record<string, unknown> = {};
for (let i = 0; i < length; i++) {
const key = this.key();
Eif (key === '__proto__') throw ERROR.UNEXPECTED_OBJ_KEY;
const value = this.readAny();
obj[key] = value;
}
return obj;
}
public readObjIndef(): Record<string, unknown> {
const obj: Record<string, unknown> = {};
while (this.reader.peak() !== CONST.END) {
const key = this.key();
if (key === '__proto__') throw ERROR.UNEXPECTED_OBJ_KEY;
if (this.reader.peak() === CONST.END) throw ERROR.UNEXPECTED_OBJ_BREAK;
const value = this.readAny();
obj[key] = value;
}
this.reader.x++;
return obj;
}
public key(): string {
const reader = this.reader;
const octet = reader.u8();
const major = octet >> 5;
const minor = octet & CONST.MINOR_MASK;
if (major !== MAJOR.STR) return String(this.readAnyRaw(octet));
const length = this.readStrLen(minor);
if (length > 31) return reader.utf8(length);
if (length > reader.size()) throw ERROR.UNEXPECTED_EOF;
const key = this.keyDecoder.decode(reader.uint8, reader.x, length);
reader.skip(length);
return key;
}
// -------------------------------------------------------------- Tag reading
public readTag(minor: number): JsonPackExtension<unknown> | unknown {
if (minor <= 23) return this.readTagRaw(minor);
switch (minor) {
case 24:
return this.readTagRaw(this.reader.u8());
case 25:
return this.readTagRaw(this.reader.u16());
case 26:
return this.readTagRaw(this.reader.u32());
case 27:
return this.readTagRaw(Number(this.reader.u64()));
default:
throw ERROR.UNEXPECTED_MINOR;
}
}
public readTagRaw(tag: number): JsonPackExtension<unknown> | unknown {
return new JsonPackExtension<unknown>(tag, this.readAny());
}
// ------------------------------------------------------------ Token reading
public readTkn(minor: number): number | true | false | null | undefined | JsonPackValue<number> {
switch (minor) {
case 0xf4 & CONST.MINOR_MASK:
return false;
case 0xf5 & CONST.MINOR_MASK:
return true;
case 0xf6 & CONST.MINOR_MASK:
return null;
case 0xf7 & CONST.MINOR_MASK:
return undefined;
case 0xf8 & CONST.MINOR_MASK:
return new JsonPackValue<number>(this.reader.u8());
case 0xf9 & CONST.MINOR_MASK:
return this.f16();
case 0xfa & CONST.MINOR_MASK:
return this.reader.f32();
case 0xfb & CONST.MINOR_MASK:
return this.reader.f64();
}
if (minor <= 23) return new JsonPackValue<number>(minor);
throw ERROR.UNEXPECTED_MINOR;
}
public f16(): number {
return decodeF16(this.reader.u16());
}
}
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