@dishuostec/llrt-types
Version:
Type definitions for LLRT, Low Latency Runtime
573 lines (571 loc) • 20.7 kB
TypeScript
/**
* `Buffer` objects are used to represent a fixed-length sequence of bytes. Many
* LLRT APIs support `Buffer`s.
*
* The `Buffer` class is a subclass of JavaScript's [`Uint8Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array) class and
* extends it with methods that cover additional use cases. LLRT APIs accept
* plain [`Uint8Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array) s wherever `Buffer`s are supported as well.
*
* While the `Buffer` class is available within the global scope, it is still
* recommended to explicitly reference it via an import or require statement.
*
* ```js
* import { Buffer } from 'buffer';
*
* // Creates a zero-filled Buffer of length 10.
* const buf1 = Buffer.alloc(10);
*
* // Creates a Buffer of length 10,
* // filled with bytes which all have the value `1`.
* const buf2 = Buffer.alloc(10, 1);
*
* // Creates a Buffer containing the bytes [1, 2, 3].
* const buf4 = Buffer.from([1, 2, 3]);
*
* // Creates a Buffer containing the bytes [1, 1, 1, 1] – the entries
* // are all truncated using `(value & 255)` to fit into the range 0–255.
* const buf5 = Buffer.from([257, 257.5, -255, '1']);
*
* // Creates a Buffer containing the UTF-8-encoded bytes for the string 'tést':
* // [0x74, 0xc3, 0xa9, 0x73, 0x74] (in hexadecimal notation)
* // [116, 195, 169, 115, 116] (in decimal notation)
* const buf6 = Buffer.from('tést');
*
* // Creates a Buffer containing the Latin-1 bytes [0x74, 0xe9, 0x73, 0x74].
* const buf7 = Buffer.from('tést', 'latin1');
* ```
*/
declare module "buffer" {
export const constants: {
MAX_LENGTH: number;
MAX_STRING_LENGTH: number;
};
export type BufferEncoding =
| "hex"
| "base64"
| "utf-8"
| "utf8"
| "unicode-1-1-utf8"
| "utf-16le"
| "utf16le"
| "utf-16"
| "utf16"
| "utf-16be"
| "utf16be"
| "windows-1252"
| "ansi_x3.4-1968"
| "ascii"
| "cp1252"
| "cp819"
| "csisolatin1"
| "ibm819"
| "iso-8859-1"
| "iso-ir-100"
| "iso8859-1"
| "iso88591"
| "iso_8859-1"
| "iso_8859-1:1987"
| "l1"
| "latin1"
| "us-ascii"
| "x-cp1252";
type WithImplicitCoercion<T> =
| T
| {
valueOf(): T;
};
interface BufferConstructor {
/**
* Allocates a new `Buffer` of `size` bytes. If `fill` is `undefined`, the `Buffer` will be zero-filled.
*
* ```js
* import { Buffer } from 'buffer';
*
* const buf = Buffer.alloc(5);
*
* console.log(buf);
* // Prints: <Buffer 00 00 00 00 00>
* ```
*
* If `fill` is specified, the allocated `Buffer` will be initialized by calling `Buffer.alloc(size, fill)`.
*
* ```js
* import { Buffer } from 'buffer';
*
* const buf = Buffer.alloc(5, 'a');
*
* console.log(buf);
* // Prints: <Buffer 61 61 61 61 61>
* ```
*
* If both `fill` and `encoding` are specified, the allocated `Buffer` will be
* initialized by calling `Buffer.aloc(size, fill, encoding)`.
*
* ```js
* import { Buffer } from 'buffer';
*
* const buf = Buffer.alloc(11, 'aGVsbG8gd29ybGQ=', 'base64');
*
* console.log(buf);
* // Prints: <Buffer 68 65 6c 6c 6f 20 77 6f 72 6c 64>
* ```
*
* @param size The desired length of the new `Buffer`.
* @param [fill=0] A value to pre-fill the new `Buffer` with.
* @param [encoding='utf8'] If `fill` is a string, this is its encoding.
*/
alloc(
size: number,
fill?: string | Uint8Array | number,
encoding?: BufferEncoding
): Buffer;
/**
* Returns the byte length of a string when encoded using `encoding`.
* This is not the same as [`String.prototype.length`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/length), which does not account
* for the encoding that is used to convert the string into bytes.
*
* ```js
* import { Buffer } from 'buffer';
*
* const str = '\u00bd + \u00bc = \u00be';
*
* console.log(`${str}: ${str.length} characters, ` +
* `${Buffer.byteLength(str, 'utf8')} bytes`);
* // Prints: ½ + ¼ = ¾: 9 characters, 12 bytes
* ```
*
* When `string` is a
* `Buffer`/[`DataView`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView)/[`TypedArray`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/-
* Reference/Global_Objects/TypedArray)/[`ArrayBuffer`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer)/[`SharedArrayBuffer`](https://develop-
* er.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer), the byte length as reported by `.byteLength`is returned.
* @param string A value to calculate the length of.
* @param [encoding='utf8'] If `string` is a string, this is its encoding.
* @return The number of bytes contained within `string`.
*/
byteLength(
string:
| string
| Buffer
| QuickJS.ArrayBufferView
| ArrayBuffer
| SharedArrayBuffer,
encoding?: BufferEncoding
): number;
/**
* Returns a new `Buffer` which is the result of concatenating all the `Buffer` instances in the `list` together.
*
* If the list has no items, or if the `totalLength` is 0, then a new zero-length `Buffer` is returned.
*
* If `totalLength` is not provided, it is calculated from the `Buffer` instances
* in `list` by adding their lengths.
*
* If `totalLength` is provided, it is coerced to an unsigned integer. If the
* combined length of the `Buffer`s in `list` exceeds `totalLength`, the result is
* truncated to `totalLength`.
*
* ```js
* import { Buffer } from 'buffer';
*
* // Create a single `Buffer` from a list of three `Buffer` instances.
*
* const buf1 = Buffer.alloc(10);
* const buf2 = Buffer.alloc(14);
* const buf3 = Buffer.alloc(18);
* const totalLength = buf1.length + buf2.length + buf3.length;
*
* console.log(totalLength);
* // Prints: 42
*
* const bufA = Buffer.concat([buf1, buf2, buf3], totalLength);
*
* console.log(bufA);
* // Prints: <Buffer 00 00 00 00 ...>
* console.log(bufA.length);
* // Prints: 42
* ```
*
* @param list List of `Buffer` or {@link Uint8Array} instances to concatenate.
* @param totalLength Total length of the `Buffer` instances in `list` when concatenated.
*/
concat(list: readonly Uint8Array[], totalLength?: number): Buffer;
/**
* Allocates a new `Buffer` using an `array` of bytes in the range `0` – `255`.
*/
from(
arrayBuffer: WithImplicitCoercion<ArrayBuffer | SharedArrayBuffer>,
byteOffset?: number,
length?: number
): Buffer;
/**
* Creates a new Buffer using the passed {data}
* @param data data to create a new Buffer
*/
from(data: Uint8Array | readonly number[]): Buffer;
from(
data: WithImplicitCoercion<Uint8Array | readonly number[] | string>
): Buffer;
/**
* Creates a new Buffer containing the given JavaScript string {str}.
* If provided, the {encoding} parameter identifies the character encoding.
* If not provided, {encoding} defaults to 'utf8'.
*/
from(
str:
| WithImplicitCoercion<string>
| {
[Symbol.toPrimitive](hint: "string"): string;
},
encoding?: BufferEncoding
): Buffer;
}
interface Buffer extends Uint8Array {
/**
* Copies data from a region of `buf` to a region in `target`, even if the `target`memory region overlaps with `buf`.
*
* [`TypedArray.prototype.set()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/set) performs the same operation, and is available
* for all TypedArrays, including `Buffer`s, although it takes
* different function arguments.
*
* ```js
* import { Buffer } from 'buffer';
*
* // Create two `Buffer` instances.
* const buf1 = Buffer.allocUnsafe(26);
* const buf2 = Buffer.allocUnsafe(26).fill('!');
*
* for (let i = 0; i < 26; i++) {
* // 97 is the decimal ASCII value for 'a'.
* buf1[i] = i + 97;
* }
*
* // Copy `buf1` bytes 16 through 19 into `buf2` starting at byte 8 of `buf2`.
* buf1.copy(buf2, 8, 16, 20);
* // This is equivalent to:
* // buf2.set(buf1.subarray(16, 20), 8);
*
* console.log(buf2.toString('ascii', 0, 25));
* // Prints: !!!!!!!!qrst!!!!!!!!!!!!!
* ```
*
* ```js
* import { Buffer } from 'buffer';
*
* // Create a `Buffer` and copy data from one region to an overlapping region
* // within the same `Buffer`.
*
* const buf = Buffer.allocUnsafe(26);
*
* for (let i = 0; i < 26; i++) {
* // 97 is the decimal ASCII value for 'a'.
* buf[i] = i + 97;
* }
*
* buf.copy(buf, 0, 4, 10);
*
* console.log(buf.toString());
* // Prints: efghijghijklmnopqrstuvwxyz
* ```
* @param target A `Buffer` or {@link Uint8Array} to copy into.
* @param [targetStart=0] The offset within `target` at which to begin writing.
* @param [sourceStart=0] The offset within `buf` from which to begin copying.
* @param [sourceEnd=buf.length] The offset within `buf` at which to stop copying (not inclusive).
* @return The number of bytes copied.
*/
copy(
target: Uint8Array,
targetStart?: number,
sourceStart?: number,
sourceEnd?: number
): number;
/**
* Returns a new `Buffer` that references the same memory as the original, but
* offset and cropped by the `start` and `end` indices.
*
* Specifying `end` greater than `buf.length` will return the same result as
* that of `end` equal to `buf.length`.
*
* This method is inherited from [`TypedArray.prototype.subarray()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/subarray).
*
* Modifying the new `Buffer` slice will modify the memory in the original `Buffer`because the allocated memory of the two objects overlap.
*
* ```js
* import { Buffer } from 'buffer';
*
* // Create a `Buffer` with the ASCII alphabet, take a slice, and modify one byte
* // from the original `Buffer`.
*
* const buf1 = Buffer.alloc(26);
*
* for (let i = 0; i < 26; i++) {
* // 97 is the decimal ASCII value for 'a'.
* buf1[i] = i + 97;
* }
*
* const buf2 = buf1.subarray(0, 3);
*
* console.log(buf2.toString('ascii', 0, buf2.length));
* // Prints: abc
*
* buf1[0] = 33;
*
* console.log(buf2.toString('ascii', 0, buf2.length));
* // Prints: !bc
* ```
*
* Specifying negative indexes causes the slice to be generated relative to the
* end of `buf` rather than the beginning.
*
* ```js
* import { Buffer } from 'buffer';
*
* const buf = Buffer.from('buffer');
*
* console.log(buf.subarray(-6, -1).toString());
* // Prints: buffe
* // (Equivalent to buf.subarray(0, 5).)
*
* console.log(buf.subarray(-6, -2).toString());
* // Prints: buff
* // (Equivalent to buf.subarray(0, 4).)
*
* console.log(buf.subarray(-5, -2).toString());
* // Prints: uff
* // (Equivalent to buf.subarray(1, 4).)
* ```
* @param [start=0] Where the new `Buffer` will start.
* @param [end=buf.length] Where the new `Buffer` will end (not inclusive).
*/
subarray(start?: number, end?: number): Buffer;
/**
* Decodes `buf` to a string according to the specified character encoding in`encoding`.
*
* If `encoding` is `'utf8'` and a byte sequence in the input is not valid UTF-8,
* then each invalid byte is replaced with the replacement character `U+FFFD`.
*
* ```js
* import { Buffer } from 'buffer';
*
* const buf1 = Buffer.alloc(26);
*
* for (let i = 0; i < 26; i++) {
* // 97 is the decimal ASCII value for 'a'.
* buf1[i] = i + 97;
* }
*
* console.log(buf1.toString('utf8'));
* // Prints: abcdefghijklmnopqrstuvwxyz
*
* const buf2 = Buffer.from('tést');
*
* console.log(buf2.toString('hex'));
* // Prints: 74c3a97374
* ```
* @param [encoding='utf8'] The character encoding to use.
*/
toString(encoding?: BufferEncoding): string;
/**
* Writes `value` to `buf` at the specified `offset` as little-endian. The `value` must be a JavaScript number. Behavior is undefined when `value` is anything
* other than a JavaScript number.
*
* ```js
* import { Buffer } from 'buffer';
*
* const buf = Buffer.allocUnsafe(8);
*
* buf.writeDoubleLE(123.456, 0);
*
* console.log(buf);
* // Prints: <Buffer 77 be 9f 1a 2f dd 5e 40>
* ```
* @param value Number to be written to `buf`.
* @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 8`.
* @return `offset` plus the number of bytes written.
*/
writeDoubleLE(value: number, offset?: number): number;
/**
* Writes `value` to `buf` at the specified `offset` as big-endian. The `value` must be a JavaScript number. Behavior is undefined when `value` is anything
* other than a JavaScript number.
*
* ```js
* import { Buffer } from 'buffer';
*
* const buf = Buffer.allocUnsafe(8);
*
* buf.writeDoubleBE(123.456, 0);
*
* console.log(buf);
* // Prints: <Buffer 40 5e dd 2f 1a 9f be 77>
* ```
* @param value Number to be written to `buf`.
* @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 8`.
* @return `offset` plus the number of bytes written.
*/
writeDoubleBE(value: number, offset?: number): number;
/**
* Writes `value` to `buf` at the specified `offset` as little-endian. Behavior is
* undefined when `value` is anything other than a JavaScript number.
*
* ```js
* import { Buffer } from 'buffer';
*
* const buf = Buffer.allocUnsafe(4);
*
* buf.writeFloatLE(0xcafebabe, 0);
*
* console.log(buf);
* // Prints: <Buffer bb fe 4a 4f>
* ```
* @param value Number to be written to `buf`.
* @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 4`.
* @return `offset` plus the number of bytes written.
*/
writeFloatLE(value: number, offset?: number): number;
/**
* Writes `value` to `buf` at the specified `offset` as big-endian. Behavior is
* undefined when `value` is anything other than a JavaScript number.
*
* ```js
* import { Buffer } from 'buffer';
*
* const buf = Buffer.allocUnsafe(4);
*
* buf.writeFloatBE(0xcafebabe, 0);
*
* console.log(buf);
* // Prints: <Buffer 4f 4a fe bb>
* ```
* @param value Number to be written to `buf`.
* @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 4`.
* @return `offset` plus the number of bytes written.
*/
writeFloatBE(value: number, offset?: number): number;
/**
* Writes `value` to `buf` at the specified `offset`. `value` must be a valid
* signed 8-bit integer. Behavior is undefined when `value` is anything other than
* a signed 8-bit integer.
*
* `value` is interpreted and written as a two's complement signed integer.
*
* ```js
* import { Buffer } from 'buffer';
*
* const buf = Buffer.allocUnsafe(2);
*
* buf.writeInt8(2, 0);
* buf.writeInt8(-2, 1);
*
* console.log(buf);
* // Prints: <Buffer 02 fe>
* ```
* @param value Number to be written to `buf`.
* @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 1`.
* @return `offset` plus the number of bytes written.
*/
writeInt8(value: number, offset?: number): number;
/**
* Writes `value` to `buf` at the specified `offset` as little-endian. The `value` must be a valid signed 16-bit integer. Behavior is undefined when `value` is
* anything other than a signed 16-bit integer.
*
* The `value` is interpreted and written as a two's complement signed integer.
*
* ```js
* import { Buffer } from 'buffer';
*
* const buf = Buffer.allocUnsafe(2);
*
* buf.writeInt16LE(0x0304, 0);
*
* console.log(buf);
* // Prints: <Buffer 04 03>
* ```
* @param value Number to be written to `buf`.
* @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 2`.
* @return `offset` plus the number of bytes written.
*/
writeInt16LE(value: number, offset?: number): number;
/**
* Writes `value` to `buf` at the specified `offset` as big-endian. The `value` must be a valid signed 16-bit integer. Behavior is undefined when `value` is
* anything other than a signed 16-bit integer.
*
* The `value` is interpreted and written as a two's complement signed integer.
*
* ```js
* import { Buffer } from 'buffer';
*
* const buf = Buffer.allocUnsafe(2);
*
* buf.writeInt16BE(0x0102, 0);
*
* console.log(buf);
* // Prints: <Buffer 01 02>
* ```
* @param value Number to be written to `buf`.
* @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 2`.
* @return `offset` plus the number of bytes written.
*/
writeInt16BE(value: number, offset?: number): number;
/**
* Writes `value` to `buf` at the specified `offset` as little-endian. The `value` must be a valid signed 32-bit integer. Behavior is undefined when `value` is
* anything other than a signed 32-bit integer.
*
* The `value` is interpreted and written as a two's complement signed integer.
*
* ```js
* import { Buffer } from 'buffer';
*
* const buf = Buffer.allocUnsafe(4);
*
* buf.writeInt32LE(0x05060708, 0);
*
* console.log(buf);
* // Prints: <Buffer 08 07 06 05>
* ```
* @param value Number to be written to `buf`.
* @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 4`.
* @return `offset` plus the number of bytes written.
*/
writeInt32LE(value: number, offset?: number): number;
/**
* Writes `value` to `buf` at the specified `offset` as big-endian. The `value` must be a valid signed 32-bit integer. Behavior is undefined when `value` is
* anything other than a signed 32-bit integer.
*
* The `value` is interpreted and written as a two's complement signed integer.
*
* ```js
* import { Buffer } from 'buffer';
*
* const buf = Buffer.allocUnsafe(4);
*
* buf.writeInt32BE(0x01020304, 0);
*
* console.log(buf);
* // Prints: <Buffer 01 02 03 04>
* ```
* @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 4`.
* @return `offset` plus the number of bytes written.
*/
writeInt32BE(value: number, offset?: number): number;
}
var Buffer: BufferConstructor;
/**
* Decodes a string of Base64-encoded data into bytes, and encodes those bytes
* into a string using UTF-8.
*
* The `data` may be any JavaScript-value that can be coerced into a string.
*
* @legacy Use `Buffer.from(data, 'base64')` instead.
* @param data The Base64-encoded input string.
*/
function atob(data: string): string;
/**
* Decodes a string into bytes using UTF-8, and encodes those bytes
* into a string using Base64.
*
* The `data` may be any JavaScript-value that can be coerced into a string.
*
* @legacy Use `buf.toString('base64')` instead.
* @param data An ASCII (Latin1) string.
*/
function btoa(data: string): string;
export { Buffer, atob, btoa };
}