Cool_Tools/two-torial-webpatcher
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Improve number patching - beerpsi

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Akitake 2024-07-04 12:09:54 +02:00
parent 1fb0ec8bdf
commit ee8e5ecdcf
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1 changed files with 29 additions and 19 deletions
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js/dllpatcher.js
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@ -512,6 +512,11 @@ class NumberPatch {
this.size = options.size;
this.min = options.min;
this.max = options.max;
this.littleEndian = options.littleEndian ?? true;
if (![1, 2, 4].includes(this.size)) {
throw new Error(`Unsupported number size: ${this.size}.`);
}
}
createUI(parent) {
@ -522,6 +527,7 @@ class NumberPatch {
patch.appendChild(createLabel(label, id));
this.number = createInput('number', id);
this.number.style.width = "3rem";
if (this.min !== null) {
this.number.min = this.min;
}
@ -543,15 +549,20 @@ class NumberPatch {
}
updateUI(file) {
// This converts bytes from the file to big endian by shifting each
// byte `i` bytes to the left then doing a bitwise OR to add the less
// significant bytes that were gathered at earlier iterations of loop
var val = 0;
const arr = new Uint8Array(this.size);
const view = new DataView(arr.buffer);
for (var i = 0; i < this.size; i++) {
val = (file[this.offset + i] << (8 * i)) | val;
arr[i] = file[this.offset + i];
}
this.number.value = val;
if (this.size === 1) {
this.number.value = view.getInt8(0);
} else if (this.size === 2) {
this.number.value = view.getInt16(0, this.littleEndian);
} else if (this.size === 4) {
this.number.value = view.getInt32(0, this.littleEndian);
}
}
validatePatch(file) {
@ -560,20 +571,19 @@ class NumberPatch {
applyPatch(file) {
// Convert user inputted number to little endian
const view = new DataView(new ArrayBuffer(this.size * 2));
view.setInt32(1, this.number.value, true);
const arr = new Uint8Array(this.size);
const view = new DataView(arr.buffer);
if (this.size === 1) {
view.setInt8(0, this.number.value);
} else if (this.size === 2) {
view.setInt16(0, this.number.value, this.littleEndian);
} else if (this.size === 4) {
view.setInt32(0, this.number.value, this.littleEndian);
}
for (var i = 0; i < this.size; i++) {
var val = view.getInt32(1);
// Shift off less significant bytes
val = val >> ((this.size - 1 - i) * 8);
// Mask off more significant bytes
val = val & 0xFF;
// Write this byte
file[this.offset + i] = val;
file[this.offset + i] = arr[i];
}
}
}