API bug fixes. Clean up. New util functions. Highlight times for newer files.

src/lib/ae_utils/ae_utils__files.ts

@@ -0,0 +1,72 @@
+// These are all file related functions.
+
+export let format_bytes = function format_bytes(
+        bytes: number,
+        decimals: number = 2
+    ) {
+    if (bytes === 0) return '0 Bytes';
+
+    const k = 1024;
+    const dm = decimals < 0 ? 0 : decimals;
+    const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
+
+    const i = Math.floor(Math.log(bytes) / Math.log(k));
+
+    return parseFloat((bytes / Math.pow(k, i)).toFixed(dm)) + ' ' + sizes[i];
+}
+
+// Updated 2024-08-12
+export let guess_file_name = function guess_file_name(filename_string: string) {
+    // console.log('*** guess_file_name() ***');
+    if (!filename_string) {
+        return '';
+    }
+
+    if (filename_string.includes('.')) {
+        let file_name = filename_string.substring(0, filename_string.lastIndexOf('.'));
+        // console.log(file_name);
+        return file_name;
+    } else {
+        return filename_string;
+    }
+}
+
+
+// Updated 2024-08-12
+export let guess_file_extension = function guess_file_extension(filename_string: string) {
+    // console.log('*** guess_file_extension() ***');
+    if (!filename_string) {
+        return '';
+    }
+
+    if (!filename_string.includes('.')) {
+        return '';
+    }
+
+    let file_extension = filename_string.substring(filename_string.lastIndexOf('.') + 1, filename_string.length) || filename_string;
+    // console.log(file_extension);
+    return file_extension;
+}
+
+
+// Updated 2024-08-12
+export let get_file_hash = async function get_file_hash(file) {
+    return new Promise((resolve, reject) => {
+        let file_reader = new FileReader();
+
+        file_reader.onload = async function() {
+            if (file_reader.result.byteLength !== file.size) {
+                console.log('File was not read completely');
+                reject("Error reading the file");
+            }
+
+            const hash_buffer = await crypto.subtle.digest('SHA-256', file_reader.result);
+            const hash_array = Array.from(new Uint8Array(hash_buffer));
+            const hash_hex = hash_array.map(b => b.toString(16).padStart(2, '0')).join('');
+
+            resolve(hash_hex);
+        };
+
+        file_reader.readAsArrayBuffer(file);
+    });
+}