From 9a37181fe7273ecee49f72ef9ef8680dcc9b4d9c Mon Sep 17 00:00:00 2001
From: Jean-Philip Desjardins <jean-philip.desjardins@polymtl.ca>
Date: Mon, 26 Aug 2024 09:20:41 -0400
Subject: [PATCH] JS: Fix seeking to end on large files.

---
 Source/Js_DiscImageDeviceStream.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Source/Js_DiscImageDeviceStream.cpp b/Source/Js_DiscImageDeviceStream.cpp
index b1ca108cc3..fb4c84f73e 100644
--- a/Source/Js_DiscImageDeviceStream.cpp
+++ b/Source/Js_DiscImageDeviceStream.cpp
@@ -15,7 +15,11 @@ void CJsDiscImageDeviceStream::Seek(int64 position, Framework::STREAM_SEEK_DIREC
 		m_position += position;
 		break;
 	case Framework::STREAM_SEEK_END:
-		m_position = MAIN_THREAD_EM_ASM_INT({return Module.discImageDevice.getFileSize()});
+		{
+			uint32 positionLo = MAIN_THREAD_EM_ASM_INT({return Module.discImageDevice.getFileSize()});
+			uint32 positionHi = MAIN_THREAD_EM_ASM_INT({return Module.discImageDevice.getFileSize() / 4294967296});
+			m_position = static_cast<uint64>(positionLo) | (static_cast<uint64>(positionHi) << 32);
+		}
 		break;
 	}
 }