Bill Thornton
39 lines
1.2 KiB
TypeScript
39 lines
1.2 KiB
TypeScript
/**
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* Reads and returns the file encoded in base64
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*/
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export function readFileAsBase64(file: File): Promise<string> {
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return new Promise(function (resolve, reject) {
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const reader = new FileReader();
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reader.onload = (e) => {
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// Split by a comma to remove the url: prefix
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const data = (e.target?.result as string)?.split?.(',')[1];
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resolve(data);
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};
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reader.onerror = reject;
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reader.readAsDataURL(file);
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});
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}
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/**
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* Reads and returns the file in text format
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*/
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export function readFileAsText(file: File): Promise<string> {
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return new Promise(function (resolve, reject) {
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const reader = new FileReader();
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reader.onload = (e) => {
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const data = e.target?.result as string;
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resolve(data);
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};
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reader.onerror = reject;
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reader.readAsText(file);
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});
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}
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/** Gets a human readable string representing a file size in bytes */
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export function getReadableSize(value: number, precision = 1) {
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let d = Math.log(value) / Math.log(1024) | 0;
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return (value / Math.pow(1024, d)).toFixed(precision)
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+ ' ' + (d ? 'KMGTPEZY'[--d] + 'iB' : 'Bytes');
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}
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