Initial Commit

packages/foundation/flow/streams-metadata/tests/fixtures.ts

@@ -0,0 +1,37 @@
+/**
+ * Inline binary fixtures shared by the streams-metadata test suite. Each
+ * helper produces the minimum bytes required to exercise a specific code
+ * path without pulling in real image files.
+ */
+
+export function buildMinimalJpeg(): Uint8Array {
+    const soi = new Uint8Array([0xff, 0xd8]);
+    const sos = new Uint8Array([
+        0xff, 0xda, 0x00, 0x08, 0x01, 0x01, 0x00, 0x00, 0x3f, 0x00,
+    ]);
+    const eoi = new Uint8Array([0xff, 0xd9]);
+    return new Uint8Array([...soi, ...sos, ...eoi]);
+}
+
+export function buildMinimalPng(): Uint8Array {
+    const sig = new Uint8Array([
+        0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a,
+    ]);
+    const ihdr = new Uint8Array(25);
+    const dv = new DataView(ihdr.buffer);
+    dv.setUint32(0, 13, false);
+    ihdr[4] = 0x49;
+    ihdr[5] = 0x48;
+    ihdr[6] = 0x44;
+    ihdr[7] = 0x52;
+    dv.setUint32(8, 100, false);
+    dv.setUint32(12, 80, false);
+    ihdr[16] = 8;
+    ihdr[17] = 2;
+    return new Uint8Array([...sig, ...ihdr]);
+}
+
+/** Pseudo-random bytes that match no known signature. */
+export function buildGibberish(): Uint8Array {
+    return new Uint8Array([0x00, 0x01, 0x02, 0x03, 0x04, 0x05]);
+}