Fix possible access beyond end of memory mapped file

diff --git a/Src/codepage_detect.cpp b/Src/codepage_detect.cpp
index 19c5de2..4d3757c 100644 (file)
--- a/Src/codepage_detect.cpp
+++ b/Src/codepage_detect.cpp
@@ -223,7 +223,7 @@ void GuessCodepageEncoding(LPCTSTR filepath, FileTextEncoding * encoding, BOOL b
                encoding->m_bom = true;
                break;
        default:
-               if (fi.pImage && !CheckForInvalidUtf8((LPBYTE)fi.pImage, 4096))
+               if (fi.pImage && !CheckForInvalidUtf8((LPBYTE)fi.pImage, fi.cbImage))
                        encoding->SetUnicoding(ucr::UTF8);
                encoding->m_bom = false;
                break;