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import {Reader} from '@jsonjoy.com/buffers/lib/Reader';
import {fromBase64Bin} from '@jsonjoy.com/base64/lib/fromBase64Bin';
import {findEndingQuote} from './util';
import type {BinaryJsonDecoder, PackValue} from '../types';
const REGEX_REPLACE_ESCAPED_CHARS = /\\(b|f|n|r|t|"|\/|\\)/g;
const escapedCharReplacer = (char: string) => {
switch (char) {
case '\\b':
return '\b';
case '\\f':
return '\f';
case '\\n':
return '\n';
case '\\r':
return '\r';
case '\\t':
return '\t';
case '\\"':
return '"';
case '\\/':
return '/';
case '\\\\':
return '\\';
}
return char;
};
// Starts with data:application/octet-stream;base64, - 64 61 74 61 3a 61 70 70 6c 69 63 61 74 69 6f 6e 2f 6f 63 74 65 74 2d 73 74 72 65 61 6d 3b 62 61 73 65 36 34 2c
const hasBinaryPrefix = (u8: Uint8Array, x: number) =>
u8[x] === 0x64 &&
u8[x + 1] === 0x61 &&
u8[x + 2] === 0x74 &&
u8[x + 3] === 0x61 &&
u8[x + 4] === 0x3a &&
u8[x + 5] === 0x61 &&
u8[x + 6] === 0x70 &&
u8[x + 7] === 0x70 &&
u8[x + 8] === 0x6c &&
u8[x + 9] === 0x69 &&
u8[x + 10] === 0x63 &&
u8[x + 11] === 0x61 &&
u8[x + 12] === 0x74 &&
u8[x + 13] === 0x69 &&
u8[x + 14] === 0x6f &&
u8[x + 15] === 0x6e &&
u8[x + 16] === 0x2f &&
u8[x + 17] === 0x6f &&
u8[x + 18] === 0x63 &&
u8[x + 19] === 0x74 &&
u8[x + 20] === 0x65 &&
u8[x + 21] === 0x74 &&
u8[x + 22] === 0x2d &&
u8[x + 23] === 0x73 &&
u8[x + 24] === 0x74 &&
u8[x + 25] === 0x72 &&
u8[x + 26] === 0x65 &&
u8[x + 27] === 0x61 &&
u8[x + 28] === 0x6d &&
u8[x + 29] === 0x3b &&
u8[x + 30] === 0x62 &&
u8[x + 31] === 0x61 &&
u8[x + 32] === 0x73 &&
u8[x + 33] === 0x65 &&
u8[x + 34] === 0x36 &&
u8[x + 35] === 0x34 &&
u8[x + 36] === 0x2c;
// Matches "data:application/cbor,base64;9w=="
const isUndefined = (u8: Uint8Array, x: number) =>
// u8[x++] === 0x22 && // "
// u8[x++] === 0x64 && // d
u8[x++] === 0x61 && // a
u8[x++] === 0x74 && // t
u8[x++] === 0x61 && // a
u8[x++] === 0x3a && // :
u8[x++] === 0x61 && // a
u8[x++] === 0x70 && // p
u8[x++] === 0x70 && // p
u8[x++] === 0x6c && // l
u8[x++] === 0x69 && // i
u8[x++] === 0x63 && // c
u8[x++] === 0x61 && // a
u8[x++] === 0x74 && // t
u8[x++] === 0x69 && // i
u8[x++] === 0x6f && // o
u8[x++] === 0x6e && // n
u8[x++] === 0x2f && // /
u8[x++] === 0x63 && // c
u8[x++] === 0x62 && // b
u8[x++] === 0x6f && // o
u8[x++] === 0x72 && // r
u8[x++] === 0x2c && // ,
u8[x++] === 0x62 && // b
u8[x++] === 0x61 && // a
u8[x++] === 0x73 && // s
u8[x++] === 0x65 && // e
u8[x++] === 0x36 && // 6
u8[x++] === 0x34 && // 4
u8[x++] === 0x3b && // ;
u8[x++] === 0x39 && // 9
u8[x++] === 0x77 && // w
u8[x++] === 0x3d && // =
u8[x++] === 0x3d && // =
u8[x++] === 0x22; // "
const fromCharCode = String.fromCharCode;
export const readKey = (reader: Reader): string => {
const buf = reader.uint8;
const len = buf.length;
const points: number[] = [];
let x = reader.x;
let prev = 0;
while (x < len) {
let code = buf[x++]!;
if ((code & 0x80) === 0) {
if (prev === 92) {
switch (code) {
case 98: // \b
code = 8;
break;
case 102: // \f
code = 12;
break;
case 110: // \n
code = 10;
break;
case 114: // \r
code = 13;
break;
case 116: // \t
code = 9;
break;
case 34: // \"
code = 34;
break;
case 47: // \/
code = 47;
break;
case 92: // \\
code = 92;
break;
default:
throw new Error('Invalid JSON');
}
prev = 0;
} else {
if (code === 34) break;
prev = code;
if (prev === 92) continue;
}
} else {
const octet2 = buf[x++]! & 0x3f;
if ((code & 0xe0) === 0xc0) {
code = ((code & 0x1f) << 6) | octet2;
} else {
const octet3 = buf[x++]! & 0x3f;
if ((code & 0xf0) === 0xe0) {
code = ((code & 0x1f) << 12) | (octet2 << 6) | octet3;
} else {
if ((code & 0xf8) === 0xf0) {
const octet4 = buf[x++]! & 0x3f;
let unit = ((code & 0x07) << 0x12) | (octet2 << 0x0c) | (octet3 << 0x06) | octet4;
if (unit > 0xffff) {
unit -= 0x10000;
const unit0 = ((unit >>> 10) & 0x3ff) | 0xd800;
unit = 0xdc00 | (unit & 0x3ff);
points.push(unit0);
code = unit;
} else E{
code = unit;
}
}
}
}
}
points.push(code);
}
reader.x = x;
return fromCharCode.apply(String, points);
};
export class JsonDecoder implements BinaryJsonDecoder {
public reader = new Reader();
public read(uint8: Uint8Array): unknown {
this.reader.reset(uint8);
return this.readAny();
}
public decode(uint8: Uint8Array): unknown {
this.reader.reset(uint8);
return this.readAny();
}
public readAny(): unknown {
this.skipWhitespace();
const reader = this.reader;
const x = reader.x;
const uint8 = reader.uint8;
const char = uint8[x];
switch (char) {
case 34 /* " */: {
if (uint8[x + 1] === 0x64 /* d */) {
const bin = this.tryReadBin();
if (bin) return bin;
if (isUndefined(uint8, x + 2)) {
reader.x = x + 35;
return undefined;
}
}
return this.readStr();
}
case 91 /* [ */:
return this.readArr();
case 102 /* f */:
return this.readFalse();
case 110 /* n */:
return this.readNull();
case 116 /* t */:
return this.readTrue();
case 123 /* { */:
return this.readObj();
default:
if ((char >= 48 /* 0 */ && char <= 57) /* 9 */ || char === 45 /* - */) return this.readNum();
throw new Error('Invalid JSON');
}
}
public skipWhitespace(): void {
const reader = this.reader;
const uint8 = reader.uint8;
let x = reader.x;
let char: number = 0;
while (true) {
char = uint8[x];
switch (char) {
case 32 /* <space> */:
case 9 /* <tab> */:
case 10 /* <line feed> */:
case 13 /* <carriage return> */:
x++;
continue;
default:
reader.x = x;
return;
}
}
}
public readNull(): null {
Iif (this.reader.u32() !== 0x6e756c6c /* null */) throw new Error('Invalid JSON');
return null;
}
public readTrue(): true {
Iif (this.reader.u32() !== 0x74727565 /* true */) throw new Error('Invalid JSON');
return true;
}
public readFalse(): false {
const reader = this.reader;
Iif (reader.u8() !== 0x66 /* f */ || reader.u32() !== 0x616c7365 /* alse */) throw new Error('Invalid JSON');
return false;
}
public readBool(): unknown {
const reader = this.reader;
switch (reader.uint8[reader.x]) {
case 102 /* f */:
return this.readFalse();
case 116 /* t */:
return this.readTrue();
default:
throw new Error('Invalid JSON');
}
}
public readNum(): number {
const reader = this.reader;
const uint8 = reader.uint8;
let x = reader.x;
let c = uint8[x++];
const c1 = c;
c = uint8[x++];
if (!c || ((c < 45 || c > 57) && c !== 43 && c !== 69 && c !== 101)) {
reader.x = x - 1;
const num = +fromCharCode(c1);
Iif (num !== num) throw new Error('Invalid JSON');
return num;
}
const c2 = c;
c = uint8[x++];
if (!c || ((c < 45 || c > 57) && c !== 43 && c !== 69 && c !== 101)) {
reader.x = x - 1;
const num = +fromCharCode(c1, c2);
Iif (num !== num) throw new Error('Invalid JSON');
return num;
}
const c3 = c;
c = uint8[x++];
if (!c || ((c < 45 || c > 57) && c !== 43 && c !== 69 && c !== 101)) {
reader.x = x - 1;
const num = +fromCharCode(c1, c2, c3);
Iif (num !== num) throw new Error('Invalid JSON');
return num;
}
const c4 = c;
c = uint8[x++];
if (!c || ((c < 45 || c > 57) && c !== 43 && c !== 69 && c !== 101)) {
reader.x = x - 1;
const num = +fromCharCode(c1, c2, c3, c4);
Iif (num !== num) throw new Error('Invalid JSON');
return num;
}
const c5 = c;
c = uint8[x++];
if (!c || ((c < 45 || c > 57) && c !== 43 && c !== 69 && c !== 101)) {
reader.x = x - 1;
const num = +fromCharCode(c1, c2, c3, c4, c5);
Iif (num !== num) throw new Error('Invalid JSON');
return num;
}
const c6 = c;
c = uint8[x++];
if (!c || ((c < 45 || c > 57) && c !== 43 && c !== 69 && c !== 101)) {
reader.x = x - 1;
const num = +fromCharCode(c1, c2, c3, c4, c5, c6);
Iif (num !== num) throw new Error('Invalid JSON');
return num;
}
const c7 = c;
c = uint8[x++];
if (!c || ((c < 45 || c > 57) && c !== 43 && c !== 69 && c !== 101)) {
reader.x = x - 1;
const num = +fromCharCode(c1, c2, c3, c4, c5, c6, c7);
Iif (num !== num) throw new Error('Invalid JSON');
return num;
}
const c8 = c;
c = uint8[x++];
if (!c || ((c < 45 || c > 57) && c !== 43 && c !== 69 && c !== 101)) {
reader.x = x - 1;
const num = +fromCharCode(c1, c2, c3, c4, c5, c6, c7, c8);
Iif (num !== num) throw new Error('Invalid JSON');
return num;
}
const c9 = c;
c = uint8[x++];
Iif (!c || ((c < 45 || c > 57) && c !== 43 && c !== 69 && c !== 101)) {
reader.x = x - 1;
const num = +fromCharCode(c1, c2, c3, c4, c5, c6, c7, c8, c9);
Iif (num !== num) throw new Error('Invalid JSON');
return num;
}
const c10 = c;
c = uint8[x++];
if (!c || ((c < 45 || c > 57) && c !== 43 && c !== 69 && c !== 101)) {
reader.x = x - 1;
const num = +fromCharCode(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10);
Iif (num !== num) throw new Error('Invalid JSON');
return num;
}
const c11 = c;
c = uint8[x++];
if (!c || ((c < 45 || c > 57) && c !== 43 && c !== 69 && c !== 101)) {
reader.x = x - 1;
const num = +fromCharCode(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11);
Iif (num !== num) throw new Error('Invalid JSON');
return num;
}
const c12 = c;
c = uint8[x++];
if (!c || ((c < 45 || c > 57) && c !== 43 && c !== 69 && c !== 101)) {
reader.x = x - 1;
const num = +fromCharCode(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12);
Iif (num !== num) throw new Error('Invalid JSON');
return num;
}
const c13 = c;
c = uint8[x++];
if (!c || ((c < 45 || c > 57) && c !== 43 && c !== 69 && c !== 101)) {
reader.x = x - 1;
const num = +fromCharCode(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13);
Iif (num !== num) throw new Error('Invalid JSON');
return num;
}
const c14 = c;
c = uint8[x++];
if (!c || ((c < 45 || c > 57) && c !== 43 && c !== 69 && c !== 101)) {
reader.x = x - 1;
const num = +fromCharCode(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14);
Iif (num !== num) throw new Error('Invalid JSON');
return num;
}
const c15 = c;
c = uint8[x++];
if (!c || ((c < 45 || c > 57) && c !== 43 && c !== 69 && c !== 101)) {
reader.x = x - 1;
const num = +fromCharCode(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15);
Iif (num !== num) throw new Error('Invalid JSON');
return num;
}
const c16 = c;
c = uint8[x++];
if (!c || ((c < 45 || c > 57) && c !== 43 && c !== 69 && c !== 101)) {
reader.x = x - 1;
const num = +fromCharCode(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16);
Iif (num !== num) throw new Error('Invalid JSON');
return num;
}
const c17 = c;
c = uint8[x++];
if (!c || ((c < 45 || c > 57) && c !== 43 && c !== 69 && c !== 101)) {
reader.x = x - 1;
const num = +fromCharCode(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17);
Iif (num !== num) throw new Error('Invalid JSON');
return num;
}
const c18 = c;
c = uint8[x++];
if (!c || ((c < 45 || c > 57) && c !== 43 && c !== 69 && c !== 101)) {
reader.x = x - 1;
const num = +fromCharCode(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18);
Iif (num !== num) throw new Error('Invalid JSON');
return num;
}
const c19 = c;
c = uint8[x++];
Iif (!c || ((c < 45 || c > 57) && c !== 43 && c !== 69 && c !== 101)) {
reader.x = x - 1;
const num = +fromCharCode(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17, c18, c19);
Iif (num !== num) throw new Error('Invalid JSON');
return num;
}
const c20 = c;
c = uint8[x++];
Iif (!c || ((c < 45 || c > 57) && c !== 43 && c !== 69 && c !== 101)) {
reader.x = x - 1;
const num = +fromCharCode(
c1,
c2,
c3,
c4,
c5,
c6,
c7,
c8,
c9,
c10,
c11,
c12,
c13,
c14,
c15,
c16,
c17,
c18,
c19,
c20,
);
Iif (num !== num) throw new Error('Invalid JSON');
return num;
}
const c21 = c;
c = uint8[x++];
Iif (!c || ((c < 45 || c > 57) && c !== 43 && c !== 69 && c !== 101)) {
reader.x = x - 1;
const num = +fromCharCode(
c1,
c2,
c3,
c4,
c5,
c6,
c7,
c8,
c9,
c10,
c11,
c12,
c13,
c14,
c15,
c16,
c17,
c18,
c19,
c20,
c21,
);
Iif (num !== num) throw new Error('Invalid JSON');
return num;
}
const c22 = c;
c = uint8[x++];
if (!c || ((c < 45 || c > 57) && c !== 43 && c !== 69 && c !== 101)) {
reader.x = x - 1;
const num = +fromCharCode(
c1,
c2,
c3,
c4,
c5,
c6,
c7,
c8,
c9,
c10,
c11,
c12,
c13,
c14,
c15,
c16,
c17,
c18,
c19,
c20,
c21,
c22,
);
Iif (num !== num) throw new Error('Invalid JSON');
return num;
}
const c23 = c;
c = uint8[x++];
if (!c || ((c < 45 || c > 57) && c !== 43 && c !== 69 && c !== 101)) {
reader.x = x - 1;
const num = +fromCharCode(
c1,
c2,
c3,
c4,
c5,
c6,
c7,
c8,
c9,
c10,
c11,
c12,
c13,
c14,
c15,
c16,
c17,
c18,
c19,
c20,
c21,
c22,
c23,
);
Iif (num !== num) throw new Error('Invalid JSON');
return num;
}
const c24 = c;
c = uint8[x++];
if (!c || ((c < 45 || c > 57) && c !== 43 && c !== 69 && c !== 101)) {
reader.x = x - 1;
const num = +fromCharCode(
c1,
c2,
c3,
c4,
c5,
c6,
c7,
c8,
c9,
c10,
c11,
c12,
c13,
c14,
c15,
c16,
c17,
c18,
c19,
c20,
c21,
c22,
c23,
c24,
);
Iif (num !== num) throw new Error('Invalid JSON');
return num;
}
throw new Error('Invalid JSON');
}
public readStr(): string {
const reader = this.reader;
const uint8 = reader.uint8;
const char = uint8[reader.x++];
Iif (char !== 0x22) throw new Error('Invalid JSON');
const x0 = reader.x;
const x1 = findEndingQuote(uint8, x0);
let str = decodeUtf8(uint8, x0, x1 - x0);
/** @todo perf: maybe faster is to first check if there are any escaped chars. */
str = str.replace(REGEX_REPLACE_ESCAPED_CHARS, escapedCharReplacer);
reader.x = x1 + 1;
return str;
}
public tryReadBin(): Uint8Array | undefined {
const reader = this.reader;
const u8 = reader.uint8;
let x = reader.x;
Iif (u8[x++] !== 0x22) return undefined;
const hasDataUrlPrefix = hasBinaryPrefix(u8, x);
if (!hasDataUrlPrefix) return undefined;
x += 37;
const x0 = x;
x = findEndingQuote(u8, x);
reader.x = x0;
const bin = fromBase64Bin(reader.view, x0, x - x0);
reader.x = x + 1;
return bin;
}
public readBin(): Uint8Array {
const reader = this.reader;
const u8 = reader.uint8;
let x = reader.x;
Iif (u8[x++] !== 0x22) throw new Error('Invalid JSON');
const hasDataUrlPrefix = hasBinaryPrefix(u8, x);
Iif (!hasDataUrlPrefix) throw new Error('Invalid JSON');
x += 37;
const x0 = x;
x = findEndingQuote(u8, x);
reader.x = x0;
const bin = fromBase64Bin(reader.view, x0, x - x0);
reader.x = x + 1;
return bin;
}
public readArr(): unknown[] {
const reader = this.reader;
Iif (reader.u8() !== 0x5b /* [ */) throw new Error('Invalid JSON');
const arr: unknown[] = [];
const uint8 = reader.uint8;
let first = true;
while (true) {
this.skipWhitespace();
const char = uint8[reader.x];
if (char === 0x5d /* ] */) return reader.x++, arr;
if (char === 0x2c /* , */) reader.x++;
else if (!first) throw new Error('Invalid JSON');
this.skipWhitespace();
arr.push(this.readAny());
first = false;
}
}
public readObj(): PackValue | Record<string, unknown> | unknown {
const reader = this.reader;
Iif (reader.u8() !== 0x7b /* { */) throw new Error('Invalid JSON');
const obj: Record<string, unknown> = {};
const uint8 = reader.uint8;
let first = true;
while (true) {
this.skipWhitespace();
let char = uint8[reader.x];
if (char === 0x7d /* } */) return reader.x++, obj;
if (char === 0x2c /* , */) reader.x++;
else if (!first) throw new Error('Invalid JSON');
this.skipWhitespace();
char = uint8[reader.x++];
Iif (char !== 0x22 /* " */) throw new Error('Invalid JSON');
const key = readKey(reader);
Iif (key === '__proto__') throw new Error('Invalid JSON');
this.skipWhitespace();
Iif (reader.u8() !== 0x3a /* : */) throw new Error('Invalid JSON');
this.skipWhitespace();
obj[key] = this.readAny();
first = false;
}
}
}
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