src: add a famous quote

src/conf.h

@@ -108,6 +108,9 @@ inline constexpr bool upx_is_integral_v = upx_is_integral<T>::value;
 
 // protect against integer overflows and malicious header fields
 // see C 11 standard, Annex K
+//
+// this limits uncompressed_size to about 640 MiB which is perfectly fine:
+//   "640 MiB Ought to be Enough for Anyone" --Markus F.X.J. Oberhumer, 1981 ;-)
 typedef size_t upx_rsize_t;
 #define UPX_RSIZE_MAX       UPX_RSIZE_MAX_MEM
 #define UPX_RSIZE_MAX_MEM   (768 * 1024 * 1024)   // DO NOT CHANGE !!!

src/util/membuffer.cpp

@@ -321,6 +321,7 @@ TEST_CASE("MemBuffer::getSizeForCompression") {
     CHECK(MemBuffer::getSizeForCompression(1024 * 1024) == 1180160);         // 0x00100000
     CHECK(MemBuffer::getSizeForCompression(64 * 1024 * 1024) == 75497984);   // 0x04000000
     CHECK(MemBuffer::getSizeForCompression(512 * 1024 * 1024) == 603980288); // 0x20000000
+    // "640 MiB Ought to be Enough for Anyone" --Markus F.X.J. Oberhumer, 1981 ;-)
     CHECK(MemBuffer::getSizeForCompression(640 * 1024 * 1024) == 754975232); // 0x28000000
 }
 

src/util/util.cpp

@@ -42,6 +42,9 @@
 // assert sane memory buffer sizes to protect against integer overflows
 // and malicious header fields
 // see C 11 standard, Annex K
+//
+// this limits uncompressed_size to about 640 MiB which is perfectly fine:
+//   "640 MiB Ought to be Enough for Anyone" --Markus F.X.J. Oberhumer, 1981 ;-)
 **************************************************************************/
 
 ACC_COMPILE_TIME_ASSERT_HEADER(UPX_RSIZE_MAX_MEM == UPX_RSIZE_MAX)