From 1cbcdcfcb677386ebec200be5649423014607b8f Mon Sep 17 00:00:00 2001
From: 42arch <rend42@163.com>
Date: Fri, 3 Jul 2026 10:39:15 +0800
Subject: [PATCH] fix(mcap): support LZ4 frame compression in MCAP decompress
 handler

---
 src/infra/sources/decompressHandlers.ts | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/infra/sources/decompressHandlers.ts b/src/infra/sources/decompressHandlers.ts
index 2b99257..db759d4 100644
--- a/src/infra/sources/decompressHandlers.ts
+++ b/src/infra/sources/decompressHandlers.ts
@@ -14,6 +14,17 @@ export async function loadDecompressHandlers(
 
   return {
     lz4: (buffer, decompressedSize) => {
+      // Check if it is an LZ4 frame (magic number 0x184D2204)
+      if (
+        buffer.length >= 4 &&
+        buffer[0] === 0x04 &&
+        buffer[1] === 0x22 &&
+        buffer[2] === 0x4d &&
+        buffer[3] === 0x18
+      ) {
+        return lz4js.decompress(buffer);
+      }
+
       const output = new Uint8Array(Number(decompressedSize));
       const result = lz4js.decompressBlock(buffer, output, 0, buffer.byteLength, 0);
       if (result < 0) {