Qortal-Hub/src/utils/fileReading/index.ts

// @ts-nocheck

class Semaphore {
	constructor(count) {
		this.count = count
		this.waiting = []
	}
	acquire() {
		return new Promise(resolve => {
			if (this.count > 0) {
				this.count--
				resolve()
			} else {
				this.waiting.push(resolve)
			}
		})
	}
	release() {
		if (this.waiting.length > 0) {
			const resolve = this.waiting.shift()
			resolve()
		} else {
			this.count++
		}
	}
}

let semaphore = new Semaphore(1)
let reader = new FileReader()

export const fileToBase64 = (file) => new Promise(async (resolve, reject) => {
	if (!reader) {
		reader = new FileReader()
	}
	await semaphore.acquire()
	reader.readAsDataURL(file)
	reader.onload = () => {
		const dataUrl = reader.result
		if (typeof dataUrl === "string") {
			const base64String = dataUrl.split(',')[1]
			reader.onload = null
			reader.onerror = null
			resolve(base64String)
		} else {
			reader.onload = null
			reader.onerror = null
			reject(new Error('Invalid data URL'))
		}
		semaphore.release()
	}
	reader.onerror = (error) => {
		reader.onload = null
		reader.onerror = null
		reject(error)
		semaphore.release()
	}
})