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From 0646e4ee471183994f78a759269f0505617711f3 Mon Sep 17 00:00:00 2001
From: Martin Hosken <martin_hosken@sil.org>
Date: Tue, 18 Apr 2017 13:17:14 +0100
Subject: [PATCH] Ensure non linear classes have even number of elements
---
src/Silf.cpp | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/src/Silf.cpp b/src/Silf.cpp
index d661992..9f2f954 100644
--- a/src/Silf.cpp
+++ b/src/Silf.cpp
@@ -293,7 +293,8 @@ size_t Silf::readClassMap(const byte *p, size_t data_len, uint32 version, Error
if (e.test(*o + 4 > max_off, E_HIGHCLASSOFFSET) // LookupClass doesn't stretch over max_off
|| e.test(lookup[0] == 0 // A LookupClass with no looks is a suspicious thing ...
|| lookup[0] * 2 + *o + 4 > max_off // numIDs lookup pairs fits within (start of LookupClass' lookups array, max_off]
- || lookup[3] + lookup[1] != lookup[0], E_BADCLASSLOOKUPINFO)) // rangeShift: numIDs - searchRange
+ || lookup[3] + lookup[1] != lookup[0], E_BADCLASSLOOKUPINFO) // rangeShift: numIDs - searchRange
+ || e.test(((o[1] - *o) & 1) != 0, ERROROFFSET)) // glyphs are in pairs so difference must be even.
return ERROROFFSET;
}
--
2.12.2
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