refactor FileIOComponent

src/components/FileIOComponent.js

@@ -1,118 +1,28 @@
-import React, { useState, useEffect } from "React";
+import React, { useState, useEffect } from "react";
 
-function isValidSysex(data) {
-    if (data.length !== 297) {
-        console.log("incorrect file length");
-        return false;
-    }
-    if (data[0] !== 0xf0) {
-        console.log("first byte is not SYSEX byte");
-        return false;
-    }
-    if (data[1] !== 0x42) {
-        console.log("manufacturer code is not KORG");
-        return false;
-    }
-    if (data[data.length - 1] !== 0xf7) {
-        console.log("last byte is does not end SYSEX message");
-        return false;
-    }
-    if (data[4] !== 0x40) {
-        console.log("not a program dump");
-        return false;
-    }
-
-    return true;
-}
-
-function loadSysex(input) {
-    let file = input.current.files[0];
-    console.log(file);
-    let reader = new FileReader();
-    reader.onload = (e) => {
-        let data = new Uint8ClampedArray(e.target.result);
-        console.log(data);
-        if (isValidSysex(data)) {
-            console.log("read in as valid sysex file");
-            return data;
-        } else {
-            console.log("could not verify sysex");
-            return null;
-        }
-    };
-    reader.readAsArrayBuffer(file);
-}
-
-// converts SYSEX file to the dump format the system uses (and the implementation refers to)
-function dumpBufferFromSysexFile(array) {
-    // remove the header and footer bytes
-    let dump = array.slice(5, -1);
-    // quick test for verification;
-    if (dump[0] !== 0x00) {
-        console.log("incorrect byte");
-        return;
-    }
-    console.log("trimmed file", dump);
-    // convert from 291 bytes to 254 (ala the implementation)
-    dump = dump.filter(function (num, index, array) {
-        return index % 8;
-    });
-    console.log("dump format", dump);
-    return dump;
-}
-
-function LoadSYSEXFile(props) {
+function FileIOComponent(props) {
     const fileInput = React.useRef();
-    const [data, updateData] = useState(new Uint8ClampedArray());
-
-    // make sure data is updating correctly
-    useEffect(() => {
-        console.log(data);
-    }, [data]);
 
     // on file load, verify correct file format
     const getFile = (event) => {
         event.preventDefault();
-        if (loadSysex(fileInput) !== null) {
-            let reader = new FileReader();
-            reader.onload = (e) => {
-                // here we load the file into a clamped byte array and trim and convert it to the dump format (see implementation)
-                let l_data = new Uint8ClampedArray(e.target.result);
-                // updata state with dump format
-                updateData(dumpBufferFromSysexFile(l_data));
-            };
-            reader.readAsArrayBuffer(fileInput.current.files[0]);
-        } else {
-            alert("Please load a SYSEX File");
-            return null;
-        }
+        let reader = new FileReader();
+        reader.onload = (e) => {
+            props.getBinaryData(new Uint8Array(e.target.result));
+        };
+        reader.readAsArrayBuffer(fileInput.current.files[0]);
     };
 
     // on submit button press, pass the file to the parent component
-    const handleInput = (event) => {
-        event.preventDefault();
-        if (fileLoaded()) {
-            props.sendFileData(data);
-        }
-    };
-
-    const fileLoaded = () => {
-        console.log(data.length);
-        return data.length === 254;
-    };
 
     return (
-        <form onSubmit={handleInput}>
+        <form>
             <label>
                 Upload a Sysex File:
                 <input type="file" ref={fileInput} onChange={getFile} />
             </label>
-            <br />
-            <button disabled={!fileLoaded()} type="submit">
-                Submit
-            </button>
         </form>
     );
 }
 
-export default LoadSYSEXFile;
+export default FileIOComponent;