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diff --git a/dviware/umddvi/h/types.h b/dviware/umddvi/h/types.h
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+/*
+ * Copyright (c) 1987 University of Maryland Department of Computer Science.
+ * All rights reserved. Permission to copy for any purpose is hereby granted
+ * so long as this copyright notice remains intact.
+ */
+
+/*
+ * C-TeX types (system dependent).
+ */
+
+#ifndef _CTEX_TYPES_
+#define _CTEX_TYPES_
+
+/* a 16 bit integer (signed) */
+typedef short i16;
+
+/* a 32 bit integer (signed) */
+typedef long i32;
+
+/* macros to sign extend quantities that are less than 32 bits long */
+#if defined(u3b) || defined(u3b2) || defined(u3b5)
+#define Sign8(n) ((n) & (1 << 7) ? ((n) | 0xffffff00) : (n))
+#define Sign16(n) ((i32) (short) (n))
+#define Sign24(n) ((n) & (1 << 23) ? ((n) | 0xff000000) : (n))
+#else
+#ifdef sun
+/* Sun mishandles (int)(char)(constant), but this subterfuge works: */
+#define Sign8(n) ((i32) (char) (int) (n))
+#else
+#define Sign8(n) ((i32) (char) (n))
+#endif /* sun */
+#define Sign16(n) ((i32) (short) (n))
+#define Sign24(n) (((n) << 8) >> 8)
+#endif /* u3b || u3b2 || u3b5 */
+
+/* macros to truncate quantites that are signed but shouldn't be */
+#define UnSign8(n) ((n) & 0xff)
+#define UnSign16(n) ((n) & 0xffff)
+#define UnSign24(n) ((n) & 0xffffff)
+
+/* note that we never have unsigned 32 bit integers */
+
+#endif /* _CTEX_TYPES_ */