Created
May 14, 2022 12:22
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Strip EXIF data from JPEGs
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/** | |
* Strip EXIF data from JPEGs | |
* | |
* @param {File} file | |
*/ | |
const stripExifFromJPEGs = (file: File): Promise<File | Blob> => { | |
// We want to strip the EXIF data only from JPEGs | |
if (file.type !== 'image/jpeg') { | |
return Promise.resolve(file) | |
} | |
return new Promise(resolve => { | |
const fileReader = new FileReader() | |
fileReader.onload = function fileReaderOnLoadCallback() { | |
const result = this.result | |
if (!(result instanceof ArrayBuffer)) { | |
return resolve(file) | |
} | |
const dataView = new DataView(result) | |
let offset = 0 | |
let recess = 0 | |
const pieces = [] | |
let i = 0 | |
if (dataView.getUint16(offset) === 0xffd8) { | |
offset += 2 | |
let app1 = dataView.getUint16(offset) | |
offset += 2 | |
while (offset < dataView.byteLength) { | |
if (app1 === 0xffe1) { | |
pieces[i] = { recess: recess, offset: offset - 2 } | |
recess = offset + dataView.getUint16(offset) | |
i++ | |
} else if (app1 === 0xffda) { | |
break | |
} | |
offset += dataView.getUint16(offset) | |
app1 = dataView.getUint16(offset) | |
offset += 2 | |
} | |
if (pieces.length > 0) { | |
const newPieces = [] | |
pieces.forEach(v => newPieces.push(result.slice(v.recess, v.offset))) | |
newPieces.push(result.slice(recess)) | |
const blob = new Blob(newPieces, { type: 'image/jpeg' }) | |
resolve(blob) | |
} | |
} | |
} | |
fileReader.readAsArrayBuffer(file) | |
}) | |
} |
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