From 5ad7f0c1e72d0bb26ff6d054bb22563b62875d62 Mon Sep 17 00:00:00 2001
From: eli_w <xhsgg12302@gmail.com>
Date: Sat, 22 Mar 2025 20:46:49 +0800
Subject: [PATCH] patterns/ani: Improved compatibility with error size defined
 in ani files (#354)

---
 patterns/ani.hexpat                              |   7 ++++++-
 .../test_data/ani.compatibility.hexpat.ani       | Bin 0 -> 9188 bytes
 2 files changed, 6 insertions(+), 1 deletion(-)
 create mode 100644 tests/patterns/test_data/ani.compatibility.hexpat.ani

diff --git a/patterns/ani.hexpat b/patterns/ani.hexpat
index f23ff75..5709032 100644
--- a/patterns/ani.hexpat
+++ b/patterns/ani.hexpat
@@ -36,7 +36,12 @@ struct RiffChunk {
     u32 size;
     if (signature == "RIFF" || signature == "LIST") {
         char type[4];
-        RiffChunk chunks[while($ - addressof(type) < size)];
+
+        // Compatible with error size defined in ani files
+        u32 remain = sizeof($) - addressof(type);
+        u32 marked = size > remain ? remain : size;
+
+        RiffChunk chunks[while($ - addressof(type) < marked)];
     } else if (signature[0] == 'I' && parent.type == "INFO") {
         char info[size];
     } else if (signature == "anih") {
diff --git a/tests/patterns/test_data/ani.compatibility.hexpat.ani b/tests/patterns/test_data/ani.compatibility.hexpat.ani
new file mode 100644
index 0000000000000000000000000000000000000000..abc6ed82e73c7a9a82c00cbbf70d71c730758ec6
GIT binary patch
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literal 0
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