@minilibs/ip2geo
Version:
Ip to Geo location instantly ⚡
255 lines (219 loc) • 7.44 kB
JavaScript
;
Object.defineProperty(exports, '__esModule', { value: true });
require('./streams.js');
/*! fetch-blob. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
// 64 KiB (same size chrome slice theirs blob into Uint8array's)
const POOL_SIZE = 65536;
/** @param {(Blob | Uint8Array)[]} parts */
async function * toIterator (parts, clone = true) {
for (const part of parts) {
if ('stream' in part) {
yield * (/** @type {AsyncIterableIterator<Uint8Array>} */ (part.stream()));
} else if (ArrayBuffer.isView(part)) {
if (clone) {
let position = part.byteOffset;
const end = part.byteOffset + part.byteLength;
while (position !== end) {
const size = Math.min(end - position, POOL_SIZE);
const chunk = part.buffer.slice(position, position + size);
position += chunk.byteLength;
yield new Uint8Array(chunk);
}
} else {
yield part;
}
/* c8 ignore next 10 */
} else {
// For blobs that have arrayBuffer but no stream method (nodes buffer.Blob)
let position = 0, b = (/** @type {Blob} */ (part));
while (position !== b.size) {
const chunk = b.slice(position, Math.min(b.size, position + POOL_SIZE));
const buffer = await chunk.arrayBuffer();
position += buffer.byteLength;
yield new Uint8Array(buffer);
}
}
}
}
const _Blob = class Blob {
/** @type {Array.<(Blob|Uint8Array)>} */
#parts = []
#type = ''
#size = 0
#endings = 'transparent'
/**
* The Blob() constructor returns a new Blob object. The content
* of the blob consists of the concatenation of the values given
* in the parameter array.
*
* @param {*} blobParts
* @param {{ type?: string, endings?: string }} [options]
*/
constructor (blobParts = [], options = {}) {
if (typeof blobParts !== 'object' || blobParts === null) {
throw new TypeError('Failed to construct \'Blob\': The provided value cannot be converted to a sequence.')
}
if (typeof blobParts[Symbol.iterator] !== 'function') {
throw new TypeError('Failed to construct \'Blob\': The object must have a callable @@iterator property.')
}
if (typeof options !== 'object' && typeof options !== 'function') {
throw new TypeError('Failed to construct \'Blob\': parameter 2 cannot convert to dictionary.')
}
if (options === null) options = {};
const encoder = new TextEncoder();
for (const element of blobParts) {
let part;
if (ArrayBuffer.isView(element)) {
part = new Uint8Array(element.buffer.slice(element.byteOffset, element.byteOffset + element.byteLength));
} else if (element instanceof ArrayBuffer) {
part = new Uint8Array(element.slice(0));
} else if (element instanceof Blob) {
part = element;
} else {
part = encoder.encode(`${element}`);
}
this.#size += ArrayBuffer.isView(part) ? part.byteLength : part.size;
this.#parts.push(part);
}
this.#endings = `${options.endings === undefined ? 'transparent' : options.endings}`;
const type = options.type === undefined ? '' : String(options.type);
this.#type = /^[\x20-\x7E]*$/.test(type) ? type : '';
}
/**
* The Blob interface's size property returns the
* size of the Blob in bytes.
*/
get size () {
return this.#size
}
/**
* The type property of a Blob object returns the MIME type of the file.
*/
get type () {
return this.#type
}
/**
* The text() method in the Blob interface returns a Promise
* that resolves with a string containing the contents of
* the blob, interpreted as UTF-8.
*
* @return {Promise<string>}
*/
async text () {
// More optimized than using this.arrayBuffer()
// that requires twice as much ram
const decoder = new TextDecoder();
let str = '';
for await (const part of toIterator(this.#parts, false)) {
str += decoder.decode(part, { stream: true });
}
// Remaining
str += decoder.decode();
return str
}
/**
* The arrayBuffer() method in the Blob interface returns a
* Promise that resolves with the contents of the blob as
* binary data contained in an ArrayBuffer.
*
* @return {Promise<ArrayBuffer>}
*/
async arrayBuffer () {
// Easier way... Just a unnecessary overhead
// const view = new Uint8Array(this.size);
// await this.stream().getReader({mode: 'byob'}).read(view);
// return view.buffer;
const data = new Uint8Array(this.size);
let offset = 0;
for await (const chunk of toIterator(this.#parts, false)) {
data.set(chunk, offset);
offset += chunk.length;
}
return data.buffer
}
stream () {
const it = toIterator(this.#parts, true);
return new globalThis.ReadableStream({
// @ts-ignore
type: 'bytes',
async pull (ctrl) {
const chunk = await it.next();
chunk.done ? ctrl.close() : ctrl.enqueue(chunk.value);
},
async cancel () {
await it.return();
}
})
}
/**
* The Blob interface's slice() method creates and returns a
* new Blob object which contains data from a subset of the
* blob on which it's called.
*
* @param {number} [start]
* @param {number} [end]
* @param {string} [type]
*/
slice (start = 0, end = this.size, type = '') {
const { size } = this;
let relativeStart = start < 0 ? Math.max(size + start, 0) : Math.min(start, size);
let relativeEnd = end < 0 ? Math.max(size + end, 0) : Math.min(end, size);
const span = Math.max(relativeEnd - relativeStart, 0);
const parts = this.#parts;
const blobParts = [];
let added = 0;
for (const part of parts) {
// don't add the overflow to new blobParts
if (added >= span) {
break
}
const size = ArrayBuffer.isView(part) ? part.byteLength : part.size;
if (relativeStart && size <= relativeStart) {
// Skip the beginning and change the relative
// start & end position as we skip the unwanted parts
relativeStart -= size;
relativeEnd -= size;
} else {
let chunk;
if (ArrayBuffer.isView(part)) {
chunk = part.subarray(relativeStart, Math.min(size, relativeEnd));
added += chunk.byteLength;
} else {
chunk = part.slice(relativeStart, Math.min(size, relativeEnd));
added += chunk.size;
}
relativeEnd -= size;
blobParts.push(chunk);
relativeStart = 0; // All next sequential parts should start at 0
}
}
const blob = new Blob([], { type: String(type).toLowerCase() });
blob.#size = span;
blob.#parts = blobParts;
return blob
}
get [Symbol.toStringTag] () {
return 'Blob'
}
static [Symbol.hasInstance] (object) {
return (
object &&
typeof object === 'object' &&
typeof object.constructor === 'function' &&
(
typeof object.stream === 'function' ||
typeof object.arrayBuffer === 'function'
) &&
/^(Blob|File)$/.test(object[Symbol.toStringTag])
)
}
};
Object.defineProperties(_Blob.prototype, {
size: { enumerable: true },
type: { enumerable: true },
slice: { enumerable: true }
});
/** @type {typeof globalThis.Blob} */
const Blob = _Blob;
exports.Blob = Blob;
exports.default = Blob;