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comparison mupdf-source/thirdparty/jbig2dec/jbig2_priv.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_PRIV_H
21 #define _JBIG2_PRIV_H
22
23 /* To enable Memento predefine MEMENTO while building by setting
24 CFLAGS=-DMEMENTO. */
25
26 /* If we are being compiled as part of a larger project that includes
27 * Memento, that project should define JBIG_EXTERNAL_MEMENTO_H to point
28 * to the include file to use.
29 */
30 #ifdef JBIG_EXTERNAL_MEMENTO_H
31 #include JBIG_EXTERNAL_MEMENTO_H
32 #else
33 #include "memento.h"
34 #endif
35
36 /* library internals */
37
38 /* If we don't have a definition for inline, make it nothing so the code will compile */
39 #ifndef inline
40 #define inline
41 #endif
42
43 typedef uint8_t byte;
44
45 #define bool int
46
47 #ifdef __cplusplus
48 #define template template_C
49 #define new new_C
50 #endif
51
52 #ifndef TRUE
53 #define TRUE 1
54 #endif
55 #ifndef FALSE
56 #define FALSE 0
57 #endif
58
59 #ifndef NULL
60 #define NULL ((void*)0)
61 #endif
62
63 #if !defined (INT32_MIN)
64 #define INT32_MIN (-0x7fffffff - 1)
65 #endif
66 #if !defined (INT32_MAX)
67 #define INT32_MAX 0x7fffffff
68 #endif
69 #if !defined (UINT32_MAX)
70 #define UINT32_MAX 0xffffffffu
71 #endif
72
73 typedef struct _Jbig2Page Jbig2Page;
74 typedef struct _Jbig2Segment Jbig2Segment;
75
76 typedef enum {
77 JBIG2_FILE_HEADER,
78 JBIG2_FILE_SEQUENTIAL_HEADER,
79 JBIG2_FILE_SEQUENTIAL_BODY,
80 JBIG2_FILE_RANDOM_HEADERS,
81 JBIG2_FILE_RANDOM_BODIES,
82 JBIG2_FILE_EOF
83 } Jbig2FileState;
84
85 struct _Jbig2Ctx {
86 Jbig2Allocator *allocator;
87 Jbig2Options options;
88 const Jbig2Ctx *global_ctx;
89 Jbig2ErrorCallback error_callback;
90 void *error_callback_data;
91
92 byte *buf;
93 size_t buf_size;
94 size_t buf_rd_ix;
95 size_t buf_wr_ix;
96
97 Jbig2FileState state;
98
99 uint8_t file_header_flags;
100 uint32_t n_pages;
101
102 uint32_t n_segments_max;
103 Jbig2Segment **segments;
104 uint32_t n_segments; /* index of last segment header parsed */
105 uint32_t segment_index; /* index of last segment body parsed */
106
107 /* list of decoded pages, including the one in progress,
108 currently stored as a contiguous, 0-indexed array. */
109 uint32_t current_page;
110 uint32_t max_page_index;
111 Jbig2Page *pages;
112 };
113
114 uint32_t jbig2_get_uint32(const byte *bptr);
115
116 int32_t jbig2_get_int32(const byte *buf);
117
118 uint16_t jbig2_get_uint16(const byte *bptr);
119
120 int16_t jbig2_get_int16(const byte *buf);
121
122 /* dynamic memory management */
123 void *jbig2_alloc(Jbig2Allocator *allocator, size_t size, size_t num);
124
125 void jbig2_free(Jbig2Allocator *allocator, void *p);
126
127 void *jbig2_realloc(Jbig2Allocator *allocator, void *p, size_t size, size_t num);
128
129 #define jbig2_new(ctx, t, size) ((t *)jbig2_alloc(ctx->allocator, size, sizeof(t)))
130
131 #define jbig2_renew(ctx, p, t, size) ((t *)jbig2_realloc(ctx->allocator, (p), size, sizeof(t)))
132
133 int jbig2_error(Jbig2Ctx *ctx, Jbig2Severity severity, uint32_t seg_idx, const char *fmt, ...)
134 #ifdef __GNUC__
135 __attribute__ ((format (__printf__, 4, 5)))
136 #endif
137 ;
138
139 /* The word stream design is a compromise between simplicity and
140 trying to amortize the number of method calls. Each ::get_next_word
141 invocation pulls 4 bytes from the stream, packed big-endian into a
142 32 bit word. The offset argument is provided as a convenience. It
143 begins at 0 and increments by 4 for each successive invocation. */
144 typedef struct _Jbig2WordStream Jbig2WordStream;
145
146 struct _Jbig2WordStream {
147 int (*get_next_word)(Jbig2Ctx *ctx, Jbig2WordStream *self, size_t offset, uint32_t *word);
148 };
149
150 Jbig2WordStream *jbig2_word_stream_buf_new(Jbig2Ctx *ctx, const byte *data, size_t size);
151
152 void jbig2_word_stream_buf_free(Jbig2Ctx *ctx, Jbig2WordStream *ws);
153
154 /* restrict is standard in C99, but not in all C++ compilers. */
155 #if defined (__STDC_VERSION_) && (__STDC_VERSION__ >= 199901L) /* C99 */
156 #define JBIG2_RESTRICT restrict
157 #elif defined(_MSC_VER) && (_MSC_VER >= 1600) /* MSVC 10 or newer */
158 #define JBIG2_RESTRICT __restrict
159 #elif defined(__GNUC__) && (__GNUC__ >= 3) /* GCC 3 or newer */
160 #define JBIG2_RESTRICT __restrict
161 #else /* Unknown or ancient */
162 #define JBIG2_RESTRICT
163 #endif
164
165 #endif /* _JBIG2_PRIV_H */