feat: modernized

src/core/blitz/readDVPL.ts

@@ -9,13 +9,13 @@ import { decodeBlock } from 'lz4';
  */
 export async function readDVPL(file: string) {
   const buffer = await readFile(file);
-  const footerBuffer = buffer.slice(buffer.length - 20, buffer.length);
+  const footerBuffer = buffer.subarray(buffer.length - 20, buffer.length);
 
   if (
     footerBuffer.toString('utf8', 16, 20) !== 'DVPL' ||
     footerBuffer.length !== 20
   ) {
-    throw 'InvalidDVPLFooter';
+    throw new SyntaxError('Invalid DVPL footer');
   }
 
   const footerData = {
@@ -24,13 +24,17 @@ export async function readDVPL(file: string) {
     crc32: footerBuffer.readUInt32LE(8),
     type: footerBuffer.readUInt32LE(12),
   };
-  const targetBlock = buffer.slice(0, buffer.length - 20);
+  const targetBlock = buffer.subarray(0, buffer.length - 20);
 
-  if (targetBlock.length !== footerData.cSize) throw 'DVPLSizeMismatch';
+  if (targetBlock.length !== footerData.cSize) {
-  if (crc32(targetBlock) !== footerData.crc32) throw 'DVPLCRC32Mismatch';
+    throw new RangeError('DVPL size mismatch');
+  }
+  if (crc32(targetBlock) !== footerData.crc32) {
+    throw new TypeError('DVPL CRC32 mismatch');
+  }
   if (footerData.type === 0) {
     if (!(footerData.oSize === footerData.cSize && footerData.type === 0)) {
-      throw 'DVPLTypeSizeMismatch';
+      throw new RangeError('DVPL type and size mismatch');
     }
 
     return targetBlock;
@@ -39,11 +43,11 @@ export async function readDVPL(file: string) {
     const DecompressedBlockSize = decodeBlock(targetBlock, deDVPLBlock);
 
     if (DecompressedBlockSize !== footerData.oSize) {
-      throw 'DVPLDecodeSizeMismatch';
+      throw new RangeError('Decompressed DVPL size mismatch');
     }
 
     return deDVPLBlock;
   } else {
-    throw new TypeError('Unknown DVPL format');
+    throw new SyntaxError('Unknown DVPL format');
   }
 }