Create mSizes

macho/universal.ts

@@ -50,6 +50,11 @@ export class Universal {
 	 */
 	private mLength = 0;
 
+	/**
+	 * Length of slice at each offset.
+	 */
+	private mSizes: Map<number, number> = new Map();
+
 	/**
 	 * Mach type.
 	 */
@@ -78,6 +83,7 @@ export class Universal {
 		this.mArchList = null;
 		this.mArchCount = 0;
 		this.mThinArch = null;
+		const mSizes = this.mSizes = new Map();
 
 		const hs = Math.max(FatHeader.BYTE_LENGTH, MachHeader.BYTE_LENGTH);
 		const hd = await reader.slice(offset, offset + hs).arrayBuffer();
@@ -124,6 +130,19 @@ export class Universal {
 				}
 				sortedList.sort((a, b) => a.offset - b.offset);
 
+				for (const { offset, size } of sortedList) {
+					if (mSizes.has(offset)) {
+						throw new RangeError(
+							`Two architectures have the same offset: ${offset}`,
+						);
+					}
+					mSizes.set(offset, size);
+
+					// TODO
+				}
+
+				// TODO
+
 				break;
 			}
 			case MH_CIGAM: