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comparison mupdf-source/thirdparty/jbig2dec/jbig2_arith.h @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /* Copyright (C) 2001-2023 Artifex Software, Inc.
2 All Rights Reserved.
3
4 This software is provided AS-IS with no warranty, either express or
5 implied.
6
7 This software is distributed under license and may not be copied,
8 modified or distributed except as expressly authorized under the terms
9 of the license contained in the file LICENSE in this distribution.
10
11 Refer to licensing information at http://www.artifex.com or contact
12 Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
13 CA 94129, USA, for further information.
14 */
15
16 /*
17 jbig2dec
18 */
19
20 #ifndef _JBIG2_ARITH_H
21 #define _JBIG2_ARITH_H
22
23 typedef struct _Jbig2ArithState Jbig2ArithState;
24
25 /* An arithmetic coding context is stored as a single byte, with the
26 index in the low order 7 bits (actually only 6 are used), and the
27 MPS in the top bit. */
28 typedef unsigned char Jbig2ArithCx;
29
30 /* allocate and initialize a new arithmetic coding state */
31 Jbig2ArithState *jbig2_arith_new(Jbig2Ctx *ctx, Jbig2WordStream *ws);
32
33 /* decode a bit */
34 /* Normally returns 0 or 1. May return negative in case of error. */
35 int jbig2_arith_decode(Jbig2Ctx *ctx, Jbig2ArithState *as, Jbig2ArithCx *pcx);
36
37 /* returns true if the end of the data stream has been reached (for sanity checks) */
38 bool jbig2_arith_has_reached_marker(Jbig2ArithState *as);
39
40 #endif /* _JBIG2_ARITH_H */