Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 | 2x 2x 2x 2x 2x 18x 18x 97x 97x 97x 97x 97x 26x 14x 16x 3x 4x 4x 4x 26x 4x 4x 4x 4x 4x 4x 3x 3x 26x 26x 26x 26x 26x 26x 26x 26x 26x 71x 71x 71x 71x 26x 26x 26x 18x 18x 46x 46x 46x 46x 46x 46x 46x 52x 52x 52x 52x 52x 46x 46x 46x 46x 16x 16x 16x 16x 16x 48x 48x 16x 16x 32x 14x 14x 14x 14x 14x 32x 32x 14x 14x 18x 18x 18x | import {Reader} from '@jsonjoy.com/buffers/lib/Reader';
import type {BinaryJsonDecoder, PackValue} from '../types';
export class BencodeDecoder 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 {
const reader = this.reader;
const x = reader.x;
const uint8 = reader.uint8;
const char = uint8[x];
switch (char) {
case 0x69: // i
return this.readNum();
case 0x64: // d
return this.readObj();
case 0x6c: // l
return this.readArr();
case 0x66: // f
return this.readFalse();
case 0x74: // t
return this.readTrue();
case 110: // n
return this.readNull();
case 117: // u
return this.readUndef();
default:
if (char >= 48 && char <= 57) return this.readBin();
}
throw new Error('INVALID_BENCODE');
}
public readNull(): null {
Iif (this.reader.u8() !== 0x6e) throw new Error('INVALID_BENCODE');
return null;
}
public readUndef(): undefined {
Iif (this.reader.u8() !== 117) throw new Error('INVALID_BENCODE');
return undefined;
}
public readTrue(): true {
Iif (this.reader.u8() !== 0x74) throw new Error('INVALID_BENCODE');
return true;
}
public readFalse(): false {
Iif (this.reader.u8() !== 0x66) throw new Error('INVALID_BENCODE');
return false;
}
public readBool(): unknown {
const reader = this.reader;
switch (reader.uint8[reader.x]) {
case 0x66: // f
return this.readFalse();
case 0x74: // t
return this.readTrue();
default:
throw new Error('INVALID_BENCODE');
}
}
public readNum(): number {
const reader = this.reader;
const startChar = reader.u8();
Iif (startChar !== 0x69) throw new Error('INVALID_BENCODE');
const u8 = reader.uint8;
let x = reader.x;
let numStr = '';
let c = u8[x++];
let i = 0;
while (c !== 0x65) {
numStr += String.fromCharCode(c);
c = u8[x++];
Iif (i > 25) throw new Error('INVALID_BENCODE');
i++;
}
Iif (!numStr) throw new Error('INVALID_BENCODE');
reader.x = x;
return +numStr;
}
public readStr(): string {
const bin = this.readBin();
return new TextDecoder().decode(bin);
}
public readBin(): Uint8Array {
const reader = this.reader;
const u8 = reader.uint8;
let lenStr = '';
let x = reader.x;
let c = u8[x++];
let i = 0;
while (c !== 0x3a) {
Iif (c < 48 || c > 57) throw new Error('INVALID_BENCODE');
lenStr += String.fromCharCode(c);
c = u8[x++];
Iif (i > 10) throw new Error('INVALID_BENCODE');
i++;
}
reader.x = x;
const len = +lenStr;
const bin = reader.buf(len);
return bin;
}
public readArr(): unknown[] {
const reader = this.reader;
Iif (reader.u8() !== 0x6c) throw new Error('INVALID_BENCODE');
const arr: unknown[] = [];
const uint8 = reader.uint8;
while (true) {
const char = uint8[reader.x];
if (char === 0x65) {
reader.x++;
return arr;
}
arr.push(this.readAny());
}
}
public readObj(): PackValue | Record<string, unknown> | unknown {
const reader = this.reader;
Iif (reader.u8() !== 0x64) throw new Error('INVALID_BENCODE');
const obj: Record<string, unknown> = {};
const uint8 = reader.uint8;
while (true) {
const char = uint8[reader.x];
if (char === 0x65) {
reader.x++;
return obj;
}
const key = this.readStr();
Iif (key === '__proto__') throw new Error('INVALID_KEY');
obj[key] = this.readAny();
}
}
}
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