From 906b64869e3e09b798b91a6490fa687ba9a94053 Mon Sep 17 00:00:00 2001
From: vonmillhausen <vonmillhausen@users.noreply.github.com>
Date: Tue, 29 Aug 2023 11:15:25 +0100
Subject: [PATCH] Added support for modified power monitoring curve bytes

Some recent work by `dteyn` and `bnister` now allows for the bytes responsible for power monitoring on the SF2000 to be changed to more sensible values. I've updated the BIOS version checking details to account for these bytes, so that `bisrv.asd` file versions can still be detected correctly even if the user has altered their power monitoring bytes
---
 tools/tools.js | 77 ++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 69 insertions(+), 8 deletions(-)

diff --git a/tools/tools.js b/tools/tools.js
index decf6ae..f559bd2 100644
--- a/tools/tools.js
+++ b/tools/tools.js
@@ -91,10 +91,71 @@ function getFirmwareHash(data) {
       return false;
     }
 
+    // Next we'll look for (and zero out) the five bytes that the power
+    // monitoring functions of the SF2000 use for switching the UI's battery
+    // level indicator. These unfortunately can't be searched for - they're just
+    // in specific known locations for specific firmware versions...
+    var prePowerCurve = findSequence([0x11, 0x05, 0x00, 0x02, 0x24], dataCopy);
+    if (prePowerCurve > -1) {
+      var powerCurveFirstByteLocation = prePowerCurve + 5;
+      switch (powerCurveFirstByteLocation) {
+        case 0x35A8F8:
+          // Seems to match mid-March layout...
+          dataCopy[0x35A8F8] = 0x00;
+          dataCopy[0x35A900] = 0x00;
+          dataCopy[0x35A9B0] = 0x00;
+          dataCopy[0x35A9B8] = 0x00;
+          dataCopy[0x35A9D4] = 0x00;
+          break;
+
+        case 0x35A954:
+          // Seems to match April 20th layout...
+          dataCopy[0x35A954] = 0x00;
+          dataCopy[0x35A95C] = 0x00;
+          dataCopy[0x35AA0C] = 0x00;
+          dataCopy[0x35AA14] = 0x00;
+          dataCopy[0x35AA30] = 0x00;
+          break;
+
+        case 0x35C78C:
+          // Seems to match May 15th layout...
+          dataCopy[0x35C78C] = 0x00;
+          dataCopy[0x35C794] = 0x00;
+          dataCopy[0x35C844] = 0x00;
+          dataCopy[0x35C84C] = 0x00;
+          dataCopy[0x35C868] = 0x00;
+          break;
+
+        case 0x35C790:
+          // Seems to match May 22nd layout...
+          dataCopy[0x35C790] = 0x00;
+          dataCopy[0x35C798] = 0x00;
+          dataCopy[0x35C848] = 0x00;
+          dataCopy[0x35C850] = 0x00;
+          dataCopy[0x35C86C] = 0x00;
+          break;
+
+        case 0x3564EC:
+          // Seems to match August 3rd layout...
+          dataCopy[0x3564EC] = 0x00;
+          dataCopy[0x3564F4] = 0x00;
+          dataCopy[0x35658C] = 0x00;
+          dataCopy[0x356594] = 0x00;
+          dataCopy[0x3565B0] = 0x00;
+          break;
+      
+        default:
+          return false;
+      }
+    }
+    else {
+      return false;
+    }
+
     // If we're here, we've zeroed-out all of the bits of the firmware that are
-    // semi-user modifiable (boot logo, button mappings and the CRC32 bits); now
-    // we can generate a hash of what's left and compare it against some known
-    // values...
+    // 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
+    // against some known values...
     return crypto.subtle.digest("SHA-256", dataCopy.buffer)
     .then(function(digest) {
       var array = Array.from(new Uint8Array(digest));
@@ -166,19 +227,19 @@ function downloadToBrowser(data, type, name) {
 // convention, or false if the provided hash doesn't match...
 function knownHash(hash) {
   switch (hash) {
-    case "4411143d3030adc442e99f7ac4e7772f300c844bbe10d639702fb3ba049a4ee1":
+    case "17b931ed95cc5506b06941cc1ea152fda9eef94d8109168f6e180fce8043ef66":
       return "03.15";
 
-    case "b50e50aa4b1b1d41489586e989f09d47c4e2bc27c072cb0112f83e6bc04e2cca":
+    case "c4ae6c69e6ca1a39bae1f8e342e41779bd45ee396e29855b795e1bacddd5916a":
       return "04.20";
 
-    case "d878a99d26242836178b452814e916bef532d05acfcc24d71baa31b8b6f38ffd":
+    case "48f86e1ff56223349186029270c6c022ce0de1ff47d6704c73e55c31ad68aec4":
       return "05.15";
 
-    case "6aebab0e4da39e0a997df255ad6a1bd12fdd356cdf51a85c614d47109a0d7d07":
+    case "1cd37343576a6584565884fcbbe2ffaf18b50466144b356aa0b885cd9cf10484":
       return "05.22";
 
-    case "3f0ca7fcd47f1202828f6dbc177d8f4e6c9f37111e8189e276d925ffd2988267":
+    case "334c8f0a8584db07078d7dfc940e540e6538dde948cb6fdbf50754e4e113d6bc":
       return "08.03";
 
     default: