react-native-file-stream

Description

The react-native-file-stream library provides a convenient way to manipulate file streams on Android.

Getting started

To install the library, run the following command:

$ npm install react-native-file-stream --save

Mostly automatic installation (for React Native version < 0.60)

To link the library, run the following command:

$ react-native link react-native-file-stream

Important

The way we read file

The way we write file

Reading files

To read a file, follow these steps:

1. Convert base64Data to ArrayBuffer. ArrayBuffer contains the original data.
2. Convert ArrayBuffer data to text or any other type of data you want.

Writing files

To write a file, follow these steps:

1. Convert your origin data to ArrayBuffer.
2. Convert ArrayBuffer data to base64Data.
3. Invoke the writeFileStream method to write data.

Usage

Read file as stream

import ReactNativeFileStream from "react-native-file-stream";

let bufferSize = 1024 * 127;
ReactNativeFileStream.readFileStream({
    uri: "content://xxxx.png",
    fileName: "xxxx.png",
    fileSize: 120023
}, bufferSize, (event) => {
    const data = event?.data;
    const hasMore = event?.hasMore;
    if (hasMore == false) {
        // Finish reading.
    }
    if (data) {
        // This is `base64Data`.
    }
})

Write file as stream

import ReactNativeFileStream from "react-native-file-stream";

// 1. Init file write stream.
let path = "file://xxxx";
ReactNativeFileStream.initWriteFileStream(path);

// 2. Append data.
let base64Data = "cGxlYXNlIGdpdmUgbWUgYSBzdGFydA==";
ReactNativeFileStream.writeFileStream(path, base64Data);

// 3. Stop writing file.
ReactNativeFileStream.stopWriteFileStream(path);

Data Conversion Methods

import ReactNativeFileStream, { DataConvertUtils } from "react-native-file-stream";

const base64DataStr = "cGxlYXNlIGdpdmUgbWUgYSBzdGFydA==";
const arrayBufferData = DataConvertUtils.base64ToArryBuffer(base64DataStr);
const base64Data2 = DataConvertUtils.arryBufferToBase64(arrayBufferData);

const unit8ArrayData = DataConvertUtils.base64ToUnit8Array(base64DataStr);
const base64Data3 = DataConvertUtils.unit8ArrayToBase64(unit8ArrayData);

If you find this project helpful, please give it a star on my Github Repo. Thank you!