95 lines
2.9 KiB
TypeScript
95 lines
2.9 KiB
TypeScript
// These are all file related functions.
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// Use a defined list of unacceptable characters to remove from a filename.
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// Updated 2024-10-18
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export const clean_filename = function clean_filename(
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filename: any | string,
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unacceptable_chars: RegExp = /[ <>:"/\\|?*]/g,
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replacement_char: string = '_'
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) {
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// console.log('*** clean_filename() ***');
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if (!filename) {
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return '';
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}
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const cleaned_filename = filename.replace(unacceptable_chars, replacement_char);
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// console.log(cleaned_filename);
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return cleaned_filename;
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};
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export const format_bytes = function format_bytes(bytes: number, decimals: number = 2) {
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if (bytes === 0) return '0 Bytes';
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const k = 1024;
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const dm = decimals < 0 ? 0 : decimals;
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const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
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const i = Math.floor(Math.log(bytes) / Math.log(k));
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return parseFloat((bytes / Math.pow(k, i)).toFixed(dm)) + ' ' + sizes[i];
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};
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// Updated 2024-08-12
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export const guess_file_name = function guess_file_name(filename_string: string) {
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// console.log('*** guess_file_name() ***');
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if (!filename_string) {
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return '';
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}
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if (filename_string.includes('.')) {
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const file_name = filename_string.substring(0, filename_string.lastIndexOf('.'));
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// console.log(file_name);
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return file_name;
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} else {
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return filename_string;
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}
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};
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// Updated 2024-08-12
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export const guess_file_extension = function guess_file_extension(filename_string: string) {
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// console.log('*** guess_file_extension() ***');
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if (!filename_string) {
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return '';
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}
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if (!filename_string.includes('.')) {
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return '';
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}
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const file_extension =
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filename_string.substring(filename_string.lastIndexOf('.') + 1, filename_string.length) ||
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filename_string;
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// console.log(file_extension);
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return file_extension;
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};
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// Updated 2024-08-12
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export const get_file_hash = async function get_file_hash(file: File): Promise<string> {
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return new Promise((resolve, reject) => {
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const file_reader = new FileReader();
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file_reader.onload = async function () {
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const result = file_reader.result;
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if (!result || typeof result === 'string') {
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console.log('File was not read completely or is in wrong format');
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reject('Error reading the file');
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return;
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}
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if (result.byteLength !== file.size) {
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console.log('File was not read completely');
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reject('Error reading the file');
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return;
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}
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const hash_buffer = await crypto.subtle.digest('SHA-256', result);
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const hash_array = Array.from(new Uint8Array(hash_buffer));
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const hash_hex = hash_array.map((b) => b.toString(16).padStart(2, '0')).join('');
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resolve(hash_hex);
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};
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file_reader.readAsArrayBuffer(file);
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});
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};
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