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| 1 | +const encoder = new TextEncoder(); |
| 2 | +const decoder = new TextDecoder(); |
| 3 | + |
| 4 | +export const NEWLINE = '\n'.charCodeAt(0); |
| 5 | + |
| 6 | +export function encode(text: string) { |
| 7 | + return encoder.encode(text); |
| 8 | +} |
| 9 | + |
| 10 | +export function decode(binary: Uint8Array, start = 0, end = binary.length) { |
| 11 | + if (start !== 0 || end !== binary.length) { |
| 12 | + return decoder.decode(binary.subarray(start, end)); |
| 13 | + } else { |
| 14 | + return decoder.decode(binary); |
| 15 | + } |
| 16 | +} |
| 17 | + |
| 18 | +export function concat(...arrays: (Uint8Array | number[])[]): Uint8Array { |
| 19 | + const totalLength = arrays.reduce((sum, arr) => sum + arr.length, 0); |
| 20 | + const result = new Uint8Array(totalLength); |
| 21 | + let offset = 0; |
| 22 | + for (const arr of arrays) { |
| 23 | + result.set(arr, offset); |
| 24 | + offset += arr.length; |
| 25 | + } |
| 26 | + return result; |
| 27 | +} |
| 28 | + |
| 29 | +export function fromHex(binary: Uint8Array) { |
| 30 | + let size = 0; |
| 31 | + for (let i = 0; i < 4; i++) { |
| 32 | + size = (size << 4) | fromHexChar(binary[i]); |
| 33 | + } |
| 34 | + return size; |
| 35 | +} |
| 36 | + |
| 37 | +export function fromHexChar(val: number) { |
| 38 | + return val < 0x57 ? val - 0x30 : val - 0x57; |
| 39 | +} |
| 40 | + |
| 41 | +export function fromDec(buffer: Uint8Array, start: number, end: number) { |
| 42 | + let val = 0; |
| 43 | + while (start < end) { |
| 44 | + val = val * 10 + fromDecChar(buffer[start++]); |
| 45 | + } |
| 46 | + return val; |
| 47 | +} |
| 48 | + |
| 49 | +export function fromDecChar(val: number) { |
| 50 | + return val - 0x30; |
| 51 | +} |
| 52 | + |
| 53 | +export function fromOct( |
| 54 | + buffer: Uint8Array, |
| 55 | + start: number, |
| 56 | + end: number, |
| 57 | +): number { |
| 58 | + let val = 0; |
| 59 | + while (start < end) { |
| 60 | + val = (val << 3) + fromDecChar(buffer[start++]); |
| 61 | + } |
| 62 | + return val; |
| 63 | +} |
| 64 | + |
| 65 | +export function toHexChar(val: number) { |
| 66 | + return val < 10 ? val + 0x30 : val + 0x57; |
| 67 | +} |
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