vdavid
/ OrientationFixer.mjs
Last active
August 15, 2023 17:45
ES6 class with zero dependencies that determines the orientation of a JPEG file, front end or back end. Returns raw orientation, but can also give a CSS transform string to use for <img style="...">. Can also convert the file to a base64 string to use as the <img src="...">. Check out the demo file below for an example on how to use it.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| export default class OrientationFixer { | |
| /** | |
| * @param {File} file | |
| * @returns {Promise<int>} | |
| */ | |
| async determineOrientation(file) { | |
| const data = await this._readFileToArrayBuffer(file); | |
| const dataView = new DataView(data); | |
| return this._isJpegFile(data, dataView) ? (this._getOrientationValueFromJpegData(dataView) || 1) : 1; | |
| }; |