mirror of
https://github.com/vonmillhausen/sf2000.git
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Updated boot logo tool to support May 22nd firmware
Should also theoretically be easier to add support for future BIOS versions... theoretically 🤷
This commit is contained in:
vonmillhausen
parent
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commit
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@ -65,7 +65,6 @@
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<body>
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<body>
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<h1>Data Frog SF2000 Boot Logo Changer</h1>
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<h1>Data Frog SF2000 Boot Logo Changer</h1>
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<p>This tool can be used to alter the boot logo on an SF2000 handheld gaming console. Please note this tool is provided as-is, and no support will be given if this corrupts your device's bios; make sure you have backups of anything you care about before messing with your device's critical files! 🙂</p>
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<p>This tool can be used to alter the boot logo on an SF2000 handheld gaming console. Please note this tool is provided as-is, and no support will be given if this corrupts your device's bios; make sure you have backups of anything you care about before messing with your device's critical files! 🙂</p>
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<h1>NOTE: THIS TOOL IS CURRENTLY INCOMPATIBLE WITH THE MAY 22ND FIRMWARE - DO NOT USE IF YOU ARE ON THAT FIRMWARE. UPDATE WILL COME SOON.</h1>
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<hr>
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<hr>
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<section id="bisrvSection">
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<section id="bisrvSection">
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<h2>Step 1: Select Original <code>bisrv.asd</code></h2>
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<h2>Step 1: Select Original <code>bisrv.asd</code></h2>
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@ -99,47 +98,174 @@
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var logoOffset; // Will contain the offset of the boot logo within the bisrv.asd file
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var logoOffset; // Will contain the offset of the boot logo within the bisrv.asd file
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var newLogoData; // Used to store the little-endian RGB565 binary data of the new boot logo
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var newLogoData; // Used to store the little-endian RGB565 binary data of the new boot logo
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// Define a function that takes a Uint8Array and an optional offset and returns the index
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// of the first match or -1 if not found...
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function findSequence(needle, haystack, offset) {
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// If offset is not provided, default to 0
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offset = offset || 0;
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// Loop through the data array starting from the offset
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for (var i = offset; i < haystack.length - needle.length + 1; i++) {
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// Assume a match until proven otherwise
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var match = true;
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// Loop through the target sequence and compare each byte
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for (var j = 0; j < needle.length; j++) {
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if (haystack[i + j] !== needle[j]) {
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// Mismatch found, break the inner loop and continue the outer loop
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match = false;
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break;
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}
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}
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// If match is still true after the inner loop, we have found a match
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if (match) {
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// Return the index of the first byte of the match
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return i;
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}
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}
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// If we reach this point, no match was found
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return -1;
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}
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// Returns an SHA-256 hash of a given firmware (ignoring common user changes), or returns
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// false on failure...
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function getFirmwareHash(data) {
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// Data should be a Uint8Array, which as an object is passed by reference... we're going
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// to be manipulating that data before generating our hash, but we don't want to modify
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// the original object at all... so we'll create a copy, and work only on the copy...
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var dataCopy = data.slice();
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// Only really worthwhile doing this for big bisrv.asd files...
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if (dataCopy.length > 12640000) {
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// First, replace CRC32 bits with 00...
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dataCopy[396] = 0x00;
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dataCopy[397] = 0x00;
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dataCopy[398] = 0x00;
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dataCopy[399] = 0x00;
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// Next identify the boot logo position, and blank it out too...
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var badExceptionOffset = findSequence([0x62, 0x61, 0x64, 0x5F, 0x65, 0x78, 0x63, 0x65, 0x70, 0x74, 0x69, 0x6F, 0x6E, 0x00, 0x00, 0x00], dataCopy);
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if (badExceptionOffset > -1) {
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var bootLogoStart = badExceptionOffset + 16;
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for (var i = bootLogoStart; i < (bootLogoStart + 204800); i++) {
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dataCopy[i] = 0x00;
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}
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}
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else {
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return false;
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}
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// Next identify the emulator button mappings (if they exist), and blank them out too...
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var preButtonMapOffset = findSequence([0x00, 0x00, 0x00, 0x71, 0xDB, 0x8E, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00], dataCopy);
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if (preButtonMapOffset > -1) {
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var postButtonMapOffset = findSequence([0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00], dataCopy, preButtonMapOffset);
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if (postButtonMapOffset > -1) {
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for (var i = preButtonMapOffset + 16; i < postButtonMapOffset; i++) {
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dataCopy[i] = 0x00;
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}
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}
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else {
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return false;
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}
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}
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else {
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return false;
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}
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// If we're here, we've zeroed-out all of the bits of the firmware that are
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// semi-user modifiable (boot logo, button mappings and the CRC32 bits); now
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// we can generate a hash of what's left and compare it against some known
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// values...
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return crypto.subtle.digest("SHA-256", dataCopy.buffer)
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.then(function(digest) {
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var array = Array.from(new Uint8Array(digest));
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var hash = array.map(byte => ("00" + byte.toString(16)).slice(-2)).join("");
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return hash;
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})
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.catch(function(error) {
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return false;
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});
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}
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else {
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return false;
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}
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}
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function bisrvLoad(file) {
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function bisrvLoad(file) {
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var frBisrv = new FileReader();
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var frBisrv = new FileReader();
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frBisrv.readAsArrayBuffer(file);
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frBisrv.onload = function(event) {
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frBisrv.onload = function(event) {
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// Read the provided file's data into an array...
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// Read the provided file's data into an array...
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var data = new Uint8Array(event.target.result);
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var data = new Uint8Array(event.target.result);
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// Let's check the data to see if it looks like one of the known bisrv.asd versions...
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// We'll do a hash-check against it...
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if (data.length == 12647452) {
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hashResult = getFirmwareHash(data);
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// That's the correct length for the original March 28th version of the file
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// The result could be either a Promise if it had a bisrv.asd-like structure and we got
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// a hash, or false otherwise... let's check!
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if (hashResult instanceof Promise) {
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// We got a Promise! Wait for it to finish so we get our bisrv.asd hash...
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hashResult.then(function(dataHash) {
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// Check the hash against all the known good ones...
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switch (dataHash) {
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// Mid-March BIOS...
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case "4411143d3030adc442e99f7ac4e7772f300c844bbe10d639702fb3ba049a4ee1":
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logoOffset = 0x9B9030;
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logoOffset = 0x9B9030;
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bisrvData = data;
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bisrvData = data;
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document.getElementById("bisrvOutput").innerHTML = "<p class=\"infoMessage\">INFO: March 28th bisrv.asd detected</p>";
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document.getElementById("bisrvOutput").innerHTML = "<p class=\"infoMessage\">INFO: Mid-March <code>bisrv.asd</code> detected</p>";
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}
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break;
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else if (data.length == 12648068) {
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// That's the correct length for the April 20th version of the file
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// April 20th BIOS...
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case "b50e50aa4b1b1d41489586e989f09d47c4e2bc27c072cb0112f83e6bc04e2cca":
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logoOffset = 0x9B91D8;
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logoOffset = 0x9B91D8;
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bisrvData = data;
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bisrvData = data;
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document.getElementById("bisrvOutput").innerHTML = "<p class=\"infoMessage\">INFO: April 20th bisrv.asd detected</p>";
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document.getElementById("bisrvOutput").innerHTML = "<p class=\"infoMessage\">INFO: April 20th <code>bisrv.asd</code> detected</p>";
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}
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break;
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else if (data.length == 12656068) {
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// That's the correct length for the May 15th version of the file
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// May 15th BIOS...
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case "d878a99d26242836178b452814e916bef532d05acfcc24d71baa31b8b6f38ffd":
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logoOffset = 0x9BB0B8;
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logoOffset = 0x9BB0B8;
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bisrvData = data;
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bisrvData = data;
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document.getElementById("bisrvOutput").innerHTML = "<p class=\"infoMessage\">INFO: May 15th bisrv.asd detected</p>";
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document.getElementById("bisrvOutput").innerHTML = "<p class=\"infoMessage\">INFO: May 15th bisrv.asd detected</p>";
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}
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break;
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else {
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document.getElementById("bisrvOutput").innerHTML = "<p class=\"errorMessage\">ERROR: The selected file does not appear to be a known bisrv.asd file!</p>";
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// May 22nd BIOS...
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document.getElementById("imageSelector").setAttribute("disabled", "");
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case "6aebab0e4da39e0a997df255ad6a1bd12fdd356cdf51a85c614d47109a0d7d07":
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document.getElementById("downloadButton").setAttribute("disabled", "");
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logoOffset = 0x9BB098;
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bisrvData = undefined;
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bisrvData = data;
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logoOffset = undefined;
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document.getElementById("bisrvOutput").innerHTML = "<p class=\"infoMessage\">INFO: May 22nd bisrv.asd detected</p>";
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break;
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default:
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// Huh... wasn't false so had bisrv.asd structure, but didn't return
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// a known hash... a new BIOS version? Unknown anyway!
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console.log(dataHash);
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document.getElementById("bisrvOutput").innerHTML = "<p class=\"errorMessage\">ERROR: While the file you've selected does appear to be generally structured like the SF2000's <code>bisrv.asd</code> BIOS file, the specifics of your file don't match any known SF2000 BIOS version. As such, this tool cannot modify the selected file.</p>";
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return;
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return;
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break;
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}
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}
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// If we're here we've got a good file, so enable the input for step 2 (image selection)...
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// If we're here we've got a good file, so enable the input for step 2 (image selection)...
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document.getElementById("imageSelector").removeAttribute("disabled");
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document.getElementById("imageSelector").removeAttribute("disabled");
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});
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}
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else {
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// We got false, so whatever it was, it wasn't a bisrv.asd...
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document.getElementById("bisrvOutput").innerHTML = "<p class=\"errorMessage\">ERROR: The file you've selected doesn't appear to have the same data structure as expected for a <code>bisrv.asd</code> file.</p>";
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return;
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}
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};
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};
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frBisrv.readAsArrayBuffer(file);
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}
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}
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function imageLoad(file) {
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function imageLoad(file) {
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@ -271,6 +397,6 @@
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}
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}
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</script>
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</script>
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<hr>
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<hr>
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<p><a rel="license" href="http://creativecommons.org/publicdomain/zero/1.0/">CC0</a>: public domain. Version 1.1, 20230516.1</p>
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<p><a rel="license" href="http://creativecommons.org/publicdomain/zero/1.0/">CC0</a>: public domain. Version 1.2, 20230522.1</p>
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</body>
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</body>
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</html>
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</html>
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