From 02198f052d6e64c6126a55be4c4ed055b4d494bf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tr=C3=A8sAbhi?= <43380238+tresabhi@users.noreply.github.com>
Date: Sat, 22 Jun 2024 17:46:16 -0500
Subject: [PATCH] feat: migrated lz4 to bun

---
 src/core/blitz/readDVPL.ts  | 25 +++++++++++++------
 src/core/blitz/writeDVPL.ts | 50 -------------------------------------
 2 files changed, 17 insertions(+), 58 deletions(-)
 delete mode 100644 src/core/blitz/writeDVPL.ts

diff --git a/src/core/blitz/readDVPL.ts b/src/core/blitz/readDVPL.ts
index f27473acf..6fb5d0845 100644
--- a/src/core/blitz/readDVPL.ts
+++ b/src/core/blitz/readDVPL.ts
@@ -1,9 +1,8 @@
 import { crc32 } from 'crc';
-import { decodeBlock } from 'lz4';
+import { decompressBlock } from 'lz4js';
 
 /**
- * Thanks Maddoxkkm! Modernized heavily.
- *
+ * Thanks Maddoxkkm! Modified heavily to be modern.
  * https://github.com/Maddoxkkm/dvpl_converter/
  */
 export function readDVPL(buffer: Buffer) {
@@ -30,6 +29,7 @@ export function readDVPL(buffer: Buffer) {
   if (crc32(targetBlock) !== footerData.crc32) {
     throw new TypeError('DVPL CRC32 mismatch');
   }
+
   if (footerData.type === 0) {
     if (!(footerData.oSize === footerData.cSize && footerData.type === 0)) {
       throw new RangeError('DVPL type and size mismatch');
@@ -37,14 +37,23 @@ export function readDVPL(buffer: Buffer) {
 
     return targetBlock;
   } else if (footerData.type === 1 || footerData.type === 2) {
-    const deDVPLBlock = Buffer.alloc(footerData.oSize);
-    const DecompressedBlockSize = decodeBlock(targetBlock, deDVPLBlock);
+    const source = new Uint8Array(targetBlock);
+    const destination = new Uint8Array(footerData.oSize);
+    const decompressedSize = decompressBlock(
+      source,
+      destination,
+      0,
+      source.length,
+      0,
+    );
 
-    if (DecompressedBlockSize !== footerData.oSize) {
-      throw new RangeError('Decompressed DVPL size mismatch');
+    if (decompressedSize !== footerData.oSize) {
+      throw new RangeError(
+        `Decompressed DVPL size mismatch (${decompressedSize} vs ${footerData.oSize})`,
+      );
     }
 
-    return deDVPLBlock;
+    return Buffer.from(destination);
   } else {
     throw new SyntaxError('Unknown DVPL format');
   }
diff --git a/src/core/blitz/writeDVPL.ts b/src/core/blitz/writeDVPL.ts
deleted file mode 100644
index 01617086f..000000000
--- a/src/core/blitz/writeDVPL.ts
+++ /dev/null
@@ -1,50 +0,0 @@
-import { crc32 } from 'crc';
-import { encodeBlockHC } from 'lz4';
-
-/**
- * Thanks Maddoxkkm! Modernized heavily.
- *
- * https://github.com/Maddoxkkm/dvpl_converter/
- */
-export function writeDVPL(buffer: Buffer) {
-  let output = Buffer.alloc(buffer.length);
-  const compressedBlockSize = encodeBlockHC(buffer, output);
-
-  if (compressedBlockSize === 0 || compressedBlockSize >= buffer.length) {
-    const footerBuffer = toDVPLFooter(
-      buffer.length,
-      buffer.length,
-      crc32(buffer),
-      0,
-    );
-
-    return Buffer.concat([buffer, footerBuffer], buffer.length + 20);
-  } else {
-    output = output.subarray(0, compressedBlockSize);
-    const footerBuffer = toDVPLFooter(
-      buffer.length,
-      compressedBlockSize,
-      crc32(output),
-      2,
-    );
-
-    return Buffer.concat([output, footerBuffer], compressedBlockSize + 20);
-  }
-}
-
-function toDVPLFooter(
-  inputSize: number,
-  compressedSize: number,
-  crc32: number,
-  type: number,
-) {
-  const result = Buffer.alloc(20);
-
-  result.writeUInt32LE(inputSize, 0);
-  result.writeUInt32LE(compressedSize, 4);
-  result.writeUInt32LE(crc32, 8);
-  result.writeUInt32LE(type, 12);
-  result.write('DVPL', 16, 4, 'utf8');
-
-  return result;
-}