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modified the copied function, to fit the style guide

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This commit is contained in:
thomasrosen 2021-01-22 08:45:09 +01:00
parent 14757887e0
commit f70c295da3
1 changed files with 28 additions and 21 deletions
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49
src/App.js
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@ -10,41 +10,48 @@ const frameSize = 1080
function getOrientation(file, callback) { function getOrientation(file, callback) {
// Source: http://stackoverflow.com/a/32490603 // Source: http://stackoverflow.com/a/32490603
var reader = new FileReader(); // (With some modifications: I just made the code fit the style-guide.)
const reader = new FileReader()
reader.onload = function (event) { reader.onload = function (event) {
var view = new DataView(event.target.result); const view = new DataView(event.target.result)
if (view.getUint16(0, false) !== 0xFFD8) return callback(-2); if (view.getUint16(0, false) !== 0xFFD8) {
return callback(-2)
}
var length = view.byteLength, const length = view.byteLength
offset = 2; let offset = 2
while (offset < length) { while (offset < length) {
var marker = view.getUint16(offset, false); const marker = view.getUint16(offset, false)
offset += 2; offset += 2
if (marker === 0xFFE1) { if (marker === 0xFFE1) {
if (view.getUint32(offset += 2, false) !== 0x45786966) { if (view.getUint32(offset += 2, false) !== 0x45786966) {
return callback(-1); return callback(-1)
} }
var little = view.getUint16(offset += 6, false) === 0x4949; const little = view.getUint16(offset += 6, false) === 0x4949
offset += view.getUint32(offset + 4, little); offset += view.getUint32(offset + 4, little)
var tags = view.getUint16(offset, little); const tags = view.getUint16(offset, little)
offset += 2; offset += 2
for (var i = 0; i < tags; i++) for (var i = 0; i < tags; i++) {
if (view.getUint16(offset + (i * 12), little) === 0x0112) if (view.getUint16(offset + (i * 12), little) === 0x0112) {
return callback(view.getUint16(offset + (i * 12) + 8, little)); return callback(view.getUint16(offset + (i * 12) + 8, little))
}
}
} else if ((marker & 0xFF00) !== 0xFF00) {
break
} else {
offset += view.getUint16(offset, false)
} }
else if ((marker & 0xFF00) !== 0xFF00) break;
else offset += view.getUint16(offset, false);
} }
return callback(-1); return callback(-1)
}; }
reader.readAsArrayBuffer(file.slice(0, 64 * 1024)); reader.readAsArrayBuffer(file.slice(0, 64 * 1024))
}; }
function App() { function App() {
const [frameURL, setFrameURL] = useState(null) const [frameURL, setFrameURL] = useState(null)