--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/jbig2dec/jbig2_arith.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,40 @@
+/* Copyright (C) 2001-2023 Artifex Software, Inc.
+   All Rights Reserved.
+
+   This software is provided AS-IS with no warranty, either express or
+   implied.
+
+   This software is distributed under license and may not be copied,
+   modified or distributed except as expressly authorized under the terms
+   of the license contained in the file LICENSE in this distribution.
+
+   Refer to licensing information at http://www.artifex.com or contact
+   Artifex Software, Inc.,  39 Mesa Street, Suite 108A, San Francisco,
+   CA 94129, USA, for further information.
+*/
+
+/*
+    jbig2dec
+*/
+
+#ifndef _JBIG2_ARITH_H
+#define _JBIG2_ARITH_H
+
+typedef struct _Jbig2ArithState Jbig2ArithState;
+
+/* An arithmetic coding context is stored as a single byte, with the
+   index in the low order 7 bits (actually only 6 are used), and the
+   MPS in the top bit. */
+typedef unsigned char Jbig2ArithCx;
+
+/* allocate and initialize a new arithmetic coding state */
+Jbig2ArithState *jbig2_arith_new(Jbig2Ctx *ctx, Jbig2WordStream *ws);
+
+/* decode a bit */
+/* Normally returns 0 or 1. May return negative in case of error. */
+int jbig2_arith_decode(Jbig2Ctx *ctx, Jbig2ArithState *as, Jbig2ArithCx *pcx);
+
+/* returns true if the end of the data stream has been reached (for sanity checks) */
+bool jbig2_arith_has_reached_marker(Jbig2ArithState *as);
+
+#endif /* _JBIG2_ARITH_H */