--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/jbig2dec/jbig2_priv.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,165 @@
+/* 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_PRIV_H
+#define _JBIG2_PRIV_H
+
+/* To enable Memento predefine MEMENTO while building by setting
+   CFLAGS=-DMEMENTO. */
+
+/* If we are being compiled as part of a larger project that includes
+ * Memento, that project should define JBIG_EXTERNAL_MEMENTO_H to point
+ * to the include file to use.
+ */
+#ifdef JBIG_EXTERNAL_MEMENTO_H
+#include JBIG_EXTERNAL_MEMENTO_H
+#else
+#include "memento.h"
+#endif
+
+/* library internals */
+
+/* If we don't have a definition for inline, make it nothing so the code will compile */
+#ifndef inline
+#define inline
+#endif
+
+typedef uint8_t byte;
+
+#define bool int
+
+#ifdef __cplusplus
+#define template template_C
+#define new new_C
+#endif
+
+#ifndef TRUE
+#define TRUE 1
+#endif
+#ifndef FALSE
+#define FALSE 0
+#endif
+
+#ifndef NULL
+#define NULL ((void*)0)
+#endif
+
+#if !defined (INT32_MIN)
+#define INT32_MIN (-0x7fffffff - 1)
+#endif
+#if !defined (INT32_MAX)
+#define INT32_MAX  0x7fffffff
+#endif
+#if !defined (UINT32_MAX)
+#define UINT32_MAX 0xffffffffu
+#endif
+
+typedef struct _Jbig2Page Jbig2Page;
+typedef struct _Jbig2Segment Jbig2Segment;
+
+typedef enum {
+    JBIG2_FILE_HEADER,
+    JBIG2_FILE_SEQUENTIAL_HEADER,
+    JBIG2_FILE_SEQUENTIAL_BODY,
+    JBIG2_FILE_RANDOM_HEADERS,
+    JBIG2_FILE_RANDOM_BODIES,
+    JBIG2_FILE_EOF
+} Jbig2FileState;
+
+struct _Jbig2Ctx {
+    Jbig2Allocator *allocator;
+    Jbig2Options options;
+    const Jbig2Ctx *global_ctx;
+    Jbig2ErrorCallback error_callback;
+    void *error_callback_data;
+
+    byte *buf;
+    size_t buf_size;
+    size_t buf_rd_ix;
+    size_t buf_wr_ix;
+
+    Jbig2FileState state;
+
+    uint8_t file_header_flags;
+    uint32_t n_pages;
+
+    uint32_t n_segments_max;
+    Jbig2Segment **segments;
+    uint32_t n_segments;             /* index of last segment header parsed */
+    uint32_t segment_index;          /* index of last segment body parsed */
+
+    /* list of decoded pages, including the one in progress,
+       currently stored as a contiguous, 0-indexed array. */
+    uint32_t current_page;
+    uint32_t max_page_index;
+    Jbig2Page *pages;
+};
+
+uint32_t jbig2_get_uint32(const byte *bptr);
+
+int32_t jbig2_get_int32(const byte *buf);
+
+uint16_t jbig2_get_uint16(const byte *bptr);
+
+int16_t jbig2_get_int16(const byte *buf);
+
+/* dynamic memory management */
+void *jbig2_alloc(Jbig2Allocator *allocator, size_t size, size_t num);
+
+void jbig2_free(Jbig2Allocator *allocator, void *p);
+
+void *jbig2_realloc(Jbig2Allocator *allocator, void *p, size_t size, size_t num);
+
+#define jbig2_new(ctx, t, size) ((t *)jbig2_alloc(ctx->allocator, size, sizeof(t)))
+
+#define jbig2_renew(ctx, p, t, size) ((t *)jbig2_realloc(ctx->allocator, (p), size, sizeof(t)))
+
+int jbig2_error(Jbig2Ctx *ctx, Jbig2Severity severity, uint32_t seg_idx, const char *fmt, ...)
+#ifdef __GNUC__
+    __attribute__ ((format (__printf__, 4, 5)))
+#endif
+    ;
+
+/* The word stream design is a compromise between simplicity and
+   trying to amortize the number of method calls. Each ::get_next_word
+   invocation pulls 4 bytes from the stream, packed big-endian into a
+   32 bit word. The offset argument is provided as a convenience. It
+   begins at 0 and increments by 4 for each successive invocation. */
+typedef struct _Jbig2WordStream Jbig2WordStream;
+
+struct _Jbig2WordStream {
+    int (*get_next_word)(Jbig2Ctx *ctx, Jbig2WordStream *self, size_t offset, uint32_t *word);
+};
+
+Jbig2WordStream *jbig2_word_stream_buf_new(Jbig2Ctx *ctx, const byte *data, size_t size);
+
+void jbig2_word_stream_buf_free(Jbig2Ctx *ctx, Jbig2WordStream *ws);
+
+/* restrict is standard in C99, but not in all C++ compilers. */
+#if defined (__STDC_VERSION_) && (__STDC_VERSION__ >= 199901L) /* C99 */
+#define JBIG2_RESTRICT restrict
+#elif defined(_MSC_VER) && (_MSC_VER >= 1600) /* MSVC 10 or newer */
+#define JBIG2_RESTRICT __restrict
+#elif defined(__GNUC__) && (__GNUC__ >= 3) /* GCC 3 or newer */
+#define JBIG2_RESTRICT __restrict
+#else /* Unknown or ancient */
+#define JBIG2_RESTRICT
+#endif
+
+#endif /* _JBIG2_PRIV_H */