BSDIFF support

_cache_service_worker.js

@@ -19,6 +19,7 @@ var PRECACHE_URLS = [
 	'/RomPatcher.js/rom-patcher-js/modules/BinFile.js',
 	'/RomPatcher.js/rom-patcher-js/modules/HashCalculator.js',
 	'/RomPatcher.js/rom-patcher-js/modules/RomPatcher.format.ips.js',
+	'/RomPatcher.js/rom-patcher-js/modules/RomPatcher.format.bdf.js',
 	'/RomPatcher.js/rom-patcher-js/modules/RomPatcher.format.bps.js',
 	'/RomPatcher.js/rom-patcher-js/modules/RomPatcher.format.ups.js',
 	'/RomPatcher.js/rom-patcher-js/modules/RomPatcher.format.aps_n64.js',
@@ -30,6 +31,7 @@ var PRECACHE_URLS = [
 	'/RomPatcher.js/rom-patcher-js/modules/zip.js/z-worker.js',
 	'/RomPatcher.js/rom-patcher-js/modules/zip.js/zip.min.js',
 	'/RomPatcher.js/rom-patcher-js/modules/zip.js/inflate.js',
+	'/RomPatcher.js/rom-patcher-js/modules/bz2/bz2.js',
 	/* Rom Patcher JS core (web assets) */
 	'/RomPatcher.js/rom-patcher-js/assets/icon_alert_orange.svg',
 	'/RomPatcher.js/rom-patcher-js/assets/icon_check_circle_green.svg',

rom-patcher-js/RomPatcher.js

@@ -97,7 +97,7 @@ const RomPatcher = (function () {
 			patchFile.littleEndian = false;
 			patchFile.seek(0);
 
-			var header = patchFile.readString(6);
+			var header = patchFile.readString(8);
 			var patch = null;
 			if (header.startsWith(IPS.MAGIC)) {
 				patch = IPS.fromFile(patchFile);
@@ -117,6 +117,8 @@ const RomPatcher = (function () {
 				patch = PMSR.fromFile(patchFile);
 			} else if (header.startsWith(VCDIFF.MAGIC)) {
 				patch = VCDIFF.fromFile(patchFile);
+			} else if (header.startsWith(BDF.MAGIC)) {
+				patch = BDF.fromFile(patchFile);
 			}
 
 			if (patch)
@@ -407,4 +409,5 @@ if (typeof module !== 'undefined' && module.exports) {
 	PPF = require('./modules/RomPatcher.format.ppf');
 	PMSR = require('./modules/RomPatcher.format.pmsr');
 	VCDIFF = require('./modules/RomPatcher.format.vcdiff');
+	BDF = require('./modules/RomPatcher.format.bdf');
 }

rom-patcher-js/RomPatcher.webapp.js

@@ -50,6 +50,7 @@ const RomPatcherWeb = (function () {
 		'modules/RomPatcher.format.ppf.js',
 		'modules/RomPatcher.format.pmsr.js',
 		'modules/RomPatcher.format.vcdiff.js',
+		'modules/RomPatcher.format.bdf.js',
 		'modules/zip.js/zip.min.js',
 		'RomPatcher.js'
 	];
@@ -1175,7 +1176,7 @@ const ZIPManager = (function (romPatcherWeb) {
 
 	const ZIP_MAGIC = '\x50\x4b\x03\x04';
 
-	const FILTER_PATCHES = /\.(ips|ups|bps|aps|rup|ppf|mod|ebp|xdelta|vcdiff)$/i;
+	const FILTER_PATCHES = /\.(ips|ups|bps|aps|rup|ppf|mod|ebp|xdelta|vcdiff|bdf|bspatch)$/i;
 	//const FILTER_ROMS=/(?<!\.(txt|diz|rtf|docx?|xlsx?|html?|pdf|jpe?g|gif|png|bmp|webp|zip|rar|7z))$/i; //negative lookbehind is not compatible with Safari https://stackoverflow.com/a/51568859
 	const FILTER_NON_ROMS = /(\.(txt|diz|rtf|docx?|xlsx?|html?|pdf|jpe?g|gif|png|bmp|webp|zip|rar|7z))$/i;
 

rom-patcher-js/RomPatcher.webworker.apply.js

@@ -12,7 +12,8 @@ self.importScripts(
 	'./modules/RomPatcher.format.rup.js',
 	'./modules/RomPatcher.format.ppf.js',
 	'./modules/RomPatcher.format.pmsr.js',
-	'./modules/RomPatcher.format.vcdiff.js'
+	'./modules/RomPatcher.format.vcdiff.js',
+	'./modules/RomPatcher.format.bdf.js'
 );
 
 

rom-patcher-js/modules/BinFile.js

@@ -303,6 +303,14 @@ BinFile.prototype.readU32 = function () {
 	this.offset += 4;
 	return this._lastRead >>> 0
 }
+BinFile.prototype.readU64 = function () {
+	if (this.littleEndian)
+		this._lastRead = this._u8array[this.offset] + (this._u8array[this.offset + 1] << 8) + (this._u8array[this.offset + 2] << 16) + (this._u8array[this.offset + 3] << 24) + (this._u8array[this.offset + 4] << 32) + (this._u8array[this.offset + 5] << 40) + (this._u8array[this.offset + 6] << 48) + (this._u8array[this.offset + 7] << 56);
+	else
+		this._lastRead = (this._u8array[this.offset] << 56) + (this._u8array[this.offset + 1] << 48) + (this._u8array[this.offset + 2] << 40) + (this._u8array[this.offset + 3] << 32) + (this._u8array[this.offset + 4] << 24) + (this._u8array[this.offset + 5] << 16) + (this._u8array[this.offset + 6] << 8) + this._u8array[this.offset + 7];
+	this.offset += 8;
+	return this._lastRead >>> 0
+}
 
 
 

rom-patcher-js/modules/RomPatcher.format.bdf.js

@@ -0,0 +1,62 @@
+/* BDF module for Rom Patcher JS v20250914 - Marc Robledo 2025 - http://www.marcrobledo.com/license */
+/* File format specification: https://www.daemonology.net/bsdiff/ */
+
+const bz2 = require('./bz2/bz2');
+
+const BDF_MAGIC='BSDIFF40';
+
+if(typeof module !== "undefined" && module.exports){
+	module.exports = BDF;
+}
+
+function BDF(){
+    this.records=[];
+    this.patchedSize=0;
+}
+
+BDF.prototype.apply=function(file){
+    var tempFile=new BinFile(this.patchedSize);
+    
+    for (const record of this.records) {
+        for (const b of record.diff) {
+            tempFile.writeU8(file.readU8() + b);
+        }
+        tempFile.writeBytes(record.extra);
+        file.seek(file.offset + record.skip);
+    }
+    return tempFile;
+}
+
+BDF.MAGIC = BDF_MAGIC;
+
+BDF.fromFile=function(file){
+    var patch=new BDF();
+
+    file.seek(8);
+    file.littleEndian=true;
+    var controlSize=file.readU64();
+    var diffSize=file.readU64();
+    patch.patchedSize=file.readU64();
+
+    var controlCompressed=file.readBytes(controlSize);
+    var diffCompressed=file.readBytes(diffSize);
+    var extraCompressed=file.readBytes(file.fileSize-file.offset);
+
+    var controlFile=new BinFile(bz2.decompress(controlCompressed));
+    controlFile.littleEndian=true;
+    var diffFile=new BinFile(bz2.decompress(diffCompressed));
+    var extraFile=new BinFile(bz2.decompress(extraCompressed));
+
+    while(!controlFile.isEOF()){
+        var diffLen=controlFile.readU64();
+        var extraLen=controlFile.readU64();
+        var skip=controlFile.readU64();
+        if(skip&(1<<63))
+            skip=-(skip&~(1<<63));
+        var diff=diffFile.readBytes(diffLen);
+        var extra=extraFile.readBytes(extraLen);
+        patch.records.push({diff, extra, skip});
+    }
+
+    return patch;
+}

rom-patcher-js/modules/bz2/LICENSE

@@ -0,0 +1,19 @@
+Copyright 2019 SheetJS LLC
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

test.js

@@ -113,6 +113,14 @@ const TEST_PATCHES = [
 		patchCrc32: 0xa211f97c,
 		patchDownload: 'https://www.romhacking.net/hacks/2871/',
 		outputCrc32: 0x9cecd976
+	},  {
+		title: 'Tetris - Rosy Retrospection',
+		romFile: 'Tetris (World) (Rev 1).gb',
+		romCrc32: 0x46df91ad,
+		patchFile: 'rosy_retrospection.bdf',
+		patchCrc32: 0xcc61564a,
+		patchDownload: 'https://www.romhacking.net/hacks/5813/',
+		outputCrc32: 0x3d400209
 	}
 ];