added streaming bullshit

performance still isn't good enough for long af tracks, maybe i'll try bf decryption in wasm

index.js

@@ -180,35 +180,51 @@ async function track(id, format, access_token, tagging) {
     let { readable, writable } = new TransformStream()
     const writer = writable.getWriter()
 
-    if (tagging) {
+    if (id3) {
         writer.write(id3.arrayBuffer)
     }
 
     const bfKey = await bf_key(id)
-    console.log(bfKey)
+    const length = Number(track.headers.get('Content-Length'))
+    
+    pipeDecryptedStream(writer, track.body, length, bfKey, id3)
+
+    return new Response(readable, { status: 200, headers: { 'content-type': 'audio/mpeg' } })
+}
+
+async function pipeDecryptedStream(writer, body, length, bfKey) {
     const cipher = new Blowfish(bfKey, Blowfish.MODE.CBC, Blowfish.PADDING.NULL)
     cipher.setIv('\x00\x01\x02\x03\x04\x05\x06\x07')
 
-    const buffer = await track.arrayBuffer()
-    const length = buffer.byteLength
+    const reader = body.getReader({ mode: 'byob' })
     let byteCount = 0
     let end = false
     while (!end) {
-        let chunkEnd = byteCount + 2048
-        if (chunkEnd > length) {
-            chunkEnd = length
-            end = true
+        end = byteCount + 2048 > length
+        let chunk
+        if (!end) {
+            chunk = new Int8Array(2048)
+        } else {
+            chunk = new Int8Array(length - byteCount)
         }
-        let chunk = buffer.slice(byteCount, byteCount+2048)
+
+        // if read chunk isn't 2048 bytes, read until it is
+        // cause of retarded readable streams not having an option to specify min bytes
+        let tempLength = 0
+        while (tempLength !== chunk.length) {
+            let read = (await reader.read(new Int8Array(chunk.length - tempLength))).value
+            chunk.set(read, tempLength)
+            tempLength += read.length
+        }
+
         if (byteCount % 6144 === 0 && !end) {
             // encrypted chunk
             chunk = cipher.decode(chunk, Blowfish.TYPE.UINT8_ARRAY)
         }
+
         writer.write(chunk)
         byteCount += 2048
     }
-
-    return new Response(readable, { status: 200, headers: { 'content-type': 'audio/mpeg' } })
 }
 
 async function track_url(json, format) {