ltgcgo/octavia

"use strict";
 
/*
  This file will extract XG SysEx addresses from the target SYX file.
*/
 
let fileBuffer = await Deno.readFile(Deno.args[0]),
fileLen = fileBuffer.length;
console.error(`Loaded "${Deno.args[0]}", ${fileLen} bytes in total.`);
let mode = 0, modePtr = 0;
let outPrefix = Deno.args[1] || `${Deno.args[0].slice(0, Deno.args[0].lastIndexOf("."))}`;
let encoder = new TextEncoder();
let addrLength = 6;
 
let streamOut = async function (str) {
    let streamBuffer = encoder.encode(str);
    let fileName = `${outPrefix}.struct.txt`;
    await Deno.writeFile(fileName, streamBuffer, {append: true, create: true});
};
 
for (let ptr = 0; ptr < fileLen; ptr ++) {
    let byte = fileBuffer[ptr];
    switch (mode) {
        case 0: {
            // Wait for 0xf0 signal
            if (byte == 240) {
                mode = 1;
                modePtr = -1;
                addrLength = 6;
            };
            break;
        };
        case 1: {
            // Extracting SysEx address
            if (byte == 247) {
                await streamOut(`\n`);
                mode = 0;
            } else {
                if (modePtr == 0) {
                    await streamOut(`0x${ptr.toString(16).padStart(6, "0")}:`);
                };
                if (modePtr == 3) {
                    switch (byte) {
                        case 1:
                        case 2: {
                            addrLength = 8;
                            break;
                        };
                        case 0:
                        case 3:{
                            //addrLength = 6;
                            break;
                        };
                    };
                };
                if (modePtr < addrLength) {
                    await streamOut(" ");
                    await streamOut(byte.toString(16).padStart(2, "0"));
                };
            };
            break;
        };
    };
    modePtr ++;
};