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'use strict' const { Minipass } = require('minipass') const TYPE = Symbol('type') const BUFFER = Symbol('buffer') class Blob { constructor (blobParts, options) { this[TYPE] = '' const buffers = [] let size = 0 if (blobParts) { const a = blobParts const length = Number(a.length) for (let i = 0; i < length; i++) { const element = a[i] const buffer = element instanceof Buffer ? element : ArrayBuffer.isView(element) ? Buffer.from(element.buffer, element.byteOffset, element.byteLength) : element instanceof ArrayBuffer ? Buffer.from(element) : element instanceof Blob ? element[BUFFER] : typeof element === 'string' ? Buffer.from(element) : Buffer.from(String(element)) size += buffer.length buffers.push(buffer) } } this[BUFFER] = Buffer.concat(buffers, size) const type = options && options.type !== undefined && String(options.type).toLowerCase() if (type && !/[^\u0020-\u007E]/.test(type)) { this[TYPE] = type } } get size () { return this[BUFFER].length } get type () { return this[TYPE] } text () { return Promise.resolve(this[BUFFER].toString()) } arrayBuffer () { const buf = this[BUFFER] const off = buf.byteOffset const len = buf.byteLength const ab = buf.buffer.slice(off, off + len) return Promise.resolve(ab) } stream () { return new Minipass().end(this[BUFFER]) } slice (start, end, type) { const size = this.size const relativeStart = start === undefined ? 0 : start < 0 ? Math.max(size + start, 0) : Math.min(start, size) const relativeEnd = end === undefined ? size : end < 0 ? Math.max(size + end, 0) : Math.min(end, size) const span = Math.max(relativeEnd - relativeStart, 0) const buffer = this[BUFFER] const slicedBuffer = buffer.slice( relativeStart, relativeStart + span ) const blob = new Blob([], { type }) blob[BUFFER] = slicedBuffer return blob } get [Symbol.toStringTag] () { return 'Blob' } static get BUFFER () { return BUFFER } } Object.defineProperties(Blob.prototype, { size: { enumerable: true }, type: { enumerable: true }, }) module.exports = Blob