Add testing for ComfyUI examples (#95)

* Add testing for ComfyUI examples

* Remove examples, add test to github action

* Create dir

* Update readme

src/scripts/metadata/flac.ts

@@ -0,0 +1,76 @@
+export function getFromFlacBuffer(buffer: ArrayBuffer): Record<string, string> {
+  const dataView = new DataView(buffer);
+
+  // Verify the FLAC signature
+  const signature = String.fromCharCode(...new Uint8Array(buffer, 0, 4));
+  if (signature !== "fLaC") {
+    console.error("Not a valid FLAC file");
+    return;
+  }
+
+  // Parse metadata blocks
+  let offset = 4;
+  let vorbisComment = null;
+  while (offset < dataView.byteLength) {
+    const isLastBlock = dataView.getUint8(offset) & 0x80;
+    const blockType = dataView.getUint8(offset) & 0x7f;
+    const blockSize = dataView.getUint32(offset, false) & 0xffffff;
+    offset += 4;
+
+    if (blockType === 4) {
+      // Vorbis Comment block type
+      vorbisComment = parseVorbisComment(
+        new DataView(buffer, offset, blockSize)
+      );
+    }
+
+    offset += blockSize;
+    if (isLastBlock) break;
+  }
+
+  return vorbisComment;
+}
+
+export function getFromFlacFile(file: File): Promise<Record<string, string>> {
+  return new Promise((r) => {
+    const reader = new FileReader();
+    reader.onload = function (event) {
+      const arrayBuffer = event.target.result as ArrayBuffer;
+      r(getFromFlacBuffer(arrayBuffer));
+    };
+    reader.readAsArrayBuffer(file);
+  });
+}
+
+// Function to parse the Vorbis Comment block
+function parseVorbisComment(dataView: DataView): Record<string, string> {
+  let offset = 0;
+  const vendorLength = dataView.getUint32(offset, true);
+  offset += 4;
+  const vendorString = getString(dataView, offset, vendorLength);
+  offset += vendorLength;
+
+  const userCommentListLength = dataView.getUint32(offset, true);
+  offset += 4;
+  const comments = {};
+  for (let i = 0; i < userCommentListLength; i++) {
+    const commentLength = dataView.getUint32(offset, true);
+    offset += 4;
+    const comment = getString(dataView, offset, commentLength);
+    offset += commentLength;
+
+    const [key, value] = comment.split("=");
+
+    comments[key] = value;
+  }
+
+  return comments;
+}
+
+function getString(dataView: DataView, offset: number, length: number): string {
+  let string = "";
+  for (let i = 0; i < length; i++) {
+    string += String.fromCharCode(dataView.getUint8(offset + i));
+  }
+  return string;
+}