Implement overflow check in MaxCompressedLength function

Add overflow check for buffer allocation in MaxCompressedLength

snappy.cc

diff --git a/snappy.cc b/snappy.cc
index ab61792..46d870c 100644
--- a/snappy.cc
+++ b/snappy.cc
@@ -194,6 +194,11 @@
 }  // namespace
 
 size_t MaxCompressedLength(size_t source_bytes) {
+  // Avoid integer overflow that could cause undersized buffer allocations.
+  // Return SIZE_MAX to force a controlled allocation failure.
+  if (source_bytes > (SIZE_MAX - 32) / 7 * 6) {
+    return SIZE_MAX;
+  }
   // Compressed data can be defined as:
   //    compressed := item* literal*
   //    item       := literal* copy