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.
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| 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; | |
| }; |