BSP Support

js/RomPatcher.js

@@ -648,6 +648,8 @@ function _getHeaderChecksumInfo(file){
 }
 
 
+const BPS_MAGIC = "BPS1"; // Verifique o valor correto para a mágica do BPS
+
 function _readPatchFile(){
 	setTabApplyEnabled(false);
 	patchFile.littleEndian=false;
@@ -679,9 +681,8 @@ function _readPatchFile(){
 			patch=parseVCDIFF(patchFile);
 		}else{
 			patch=null;
-			setMessage('apply', 'error_invalid_patch', 'error');
+			setMessage('apply', 'Unsupported patch format', 'error');
 		}
-
 		validateSource();
 		setTabApplyEnabled(true);
 	}

js/formats/BSP.js

@@ -0,0 +1,101 @@
+/* BSP module for Rom Patcher JS v20220417 - Vagner Matheus 2016-2024 */
+const BSP_MAGIC = 'BSP';
+const BSP_VERSION = 1;
+const BSP_MAX_SIZE = 0x1000000; // 16 megabytes
+
+function BSP() {
+    this.records = [];
+}
+
+BSP.prototype.addRecord = function(o, d) {
+    this.records.push({offset: o, data: d});
+};
+
+BSP.prototype.toString = function() {
+    let s = 'Records: ' + this.records.length;
+    return s;
+};
+
+BSP.prototype.export = function(fileName) {
+    let patchFileSize = 8; // BSP magic + version
+    for (let i = 0; i < this.records.length; i++) {
+        patchFileSize += 4 + this.records[i].data.length; // offset + data length
+    }
+    
+    let tempFile = new MarcFile(patchFileSize);
+    tempFile.fileName = fileName + '.bsp';
+    tempFile.writeString(BSP_MAGIC);
+    tempFile.writeU32(BSP_VERSION);
+
+    for (let i = 0; i < this.records.length; i++) {
+        let rec = this.records[i];
+        tempFile.writeU32(rec.offset);
+        tempFile.writeBytes(rec.data);
+    }
+
+    return tempFile;
+};
+
+BSP.prototype.apply = function(romFile) {
+    let tempFile = new MarcFile(romFile.fileSize);
+    romFile.copyToFile(tempFile, 0);
+
+    for (let i = 0; i < this.records.length; i++) {
+        tempFile.seek(this.records[i].offset);
+        tempFile.writeBytes(this.records[i].data);
+    }
+
+    return tempFile;
+};
+
+function parseBSPFile(file) {
+    let patchFile = new BSP();
+    file.seek(4); // Skip magic
+    let version = file.readU32();
+
+    if (version !== BSP_VERSION) {
+        throw new Error('Unsupported BSP version');
+    }
+
+    while (!file.isEOF()) {
+        let offset = file.readU32();
+        let length = file.fileSize - file.offset; // remaining bytes
+        let data = file.readBytes(length);
+        patchFile.addRecord(offset, data);
+    }
+
+    return patchFile;
+}
+
+function createBSPFromFiles(original, modified) {
+    let patch = new BSP();
+
+    while (!modified.isEOF()) {
+        let b1 = original.isEOF() ? 0x00 : original.readU8();
+        let b2 = modified.readU8();
+
+        if (b1 !== b2) {
+            let differentData = [];
+            let startOffset = modified.offset - 1;
+
+            while (b1 !== b2 && differentData.length < 0xffff) {
+                differentData.push(b2);
+                if (modified.isEOF() || differentData.length === 0xffff) {
+                    break;
+                }
+
+                b1 = original.isEOF() ? 0x00 : original.readU8();
+                b2 = modified.readU8();
+            }
+
+            if (startOffset >= BSP_MAX_SIZE) {
+                throw new Error('Files are too big for BSP format');
+                return null;
+            }
+
+            patch.addRecord(startOffset, differentData);
+        }
+    }
+
+    return patch;
+}