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Update tools.js

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Added support for checking firmwares that have modified the two byte-pairs `bnister` identified as a workaround for the whole "start-SNES-games-twice" issue that cropped up in firmware versions after March
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vonmillhausen 2023-10-09 17:56:35 +01:00
parent 643b3a798f
commit a87b80d577
1 changed files with 25 additions and 5 deletions
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30
tools/tools.js
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@ -12,6 +12,10 @@
Just like the tools themselves, this file should be considered CC0 Public Just like the tools themselves, this file should be considered CC0 Public
Domain (https://creativecommons.org/publicdomain/zero/1.0/) Domain (https://creativecommons.org/publicdomain/zero/1.0/)
Version 1.3: Added support for blanking out the SNES audio bitrate and cycles
bits that `bnister` identified as a workaround for the "start-SNES-games-
twice" issue that cropped up in firmware versions after March
Version 1.2: Added support for blanking out the power curve monitoring bytes Version 1.2: Added support for blanking out the power curve monitoring bytes
in getFirmwareHash(), and updated the hashes accordingly in knownHash() in getFirmwareHash(), and updated the hashes accordingly in knownHash()
@ -155,6 +159,22 @@ function getFirmwareHash(data) {
return false; return false;
} }
// Next we'll look for and zero out the bytes used for SNES audio rate and
// CPU cycles, in case folks want to patch those bytes to correct SNES
// first-launch issues on newer firmwares...
var preSNESBytes = findSequence([0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0x80], dataCopy);
if (preSNESBytes > -1) {
var snesAudioBitrateBytes = preSNESBytes + 8;
var snesCPUCyclesBytes = snesAudioBitrateBytes + 8;
dataCopy[snesAudioBitrateBytes] = 0x00;
dataCopy[snesAudioBitrateBytes + 1] = 0x00;
dataCopy[snesCPUCyclesBytes] = 0x00;
dataCopy[snesCPUCyclesBytes + 1] = 0x00;
}
else {
return false;
}
// If we're here, we've zeroed-out all of the bits of the firmware that are // If we're here, we've zeroed-out all of the bits of the firmware that are
// semi-user modifiable (CRC32 bits, boot logo, button mappings and power // semi-user modifiable (CRC32 bits, boot logo, button mappings and power
// curve bytes); now we can generate a hash of what's left and compare it // curve bytes); now we can generate a hash of what's left and compare it
@ -230,19 +250,19 @@ function downloadToBrowser(data, type, name) {
// convention, or false if the provided hash doesn't match... // convention, or false if the provided hash doesn't match...
function knownHash(hash) { function knownHash(hash) {
switch (hash) { switch (hash) {
case "17b931ed95cc5506b06941cc1ea152fda9eef94d8109168f6e180fce8043ef66": case "149706c009c446267e767313e149adc733d167d25e731694b2bdb1646a41ed08":
return "03.15"; return "03.15";
case "c4ae6c69e6ca1a39bae1f8e342e41779bd45ee396e29855b795e1bacddd5916a": case "151d5eeac148cbede3acba28823c65a34369d31b61c54bdd8ad049767d1c3697":
return "04.20"; return "04.20";
case "48f86e1ff56223349186029270c6c022ce0de1ff47d6704c73e55c31ad68aec4": case "ab0ce4923086afc535154023ddea1d355bcedb89e6314a47d9c1b77c7a9e75e3":
return "05.15"; return "05.15";
case "1cd37343576a6584565884fcbbe2ffaf18b50466144b356aa0b885cd9cf10484": case "67c5dfc5825a0d9cf953206c2231b29512482e97fef688fe32bf5c31acdb370a":
return "05.22"; return "05.22";
case "334c8f0a8584db07078d7dfc940e540e6538dde948cb6fdbf50754e4e113d6bc": case "5335860d13214484eeb1260db8fe322efc87983b425ac5a5f8b0fcdf9588f40a":
return "08.03"; return "08.03";
default: default: