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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
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1 /* Copyright (C) 2001-2023 Artifex Software, Inc.
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2 All Rights Reserved.
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3
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4 This software is provided AS-IS with no warranty, either express or
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5 implied.
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6
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7 This software is distributed under license and may not be copied,
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8 modified or distributed except as expressly authorized under the terms
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9 of the license contained in the file LICENSE in this distribution.
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11 Refer to licensing information at http://www.artifex.com or contact
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12 Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
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13 CA 94129, USA, for further information.
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14 */
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16 /*
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17 jbig2dec
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18 */
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20 #ifndef _JBIG2_H
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21 #define _JBIG2_H
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23 #ifdef __cplusplus
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24 extern "C"
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25 {
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26 #endif
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28 #define JBIG2_VERSION_MAJOR (0)
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29 #define JBIG2_VERSION_MINOR (20)
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31 /* warning levels */
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32 typedef enum {
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33 JBIG2_SEVERITY_DEBUG,
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34 JBIG2_SEVERITY_INFO,
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35 JBIG2_SEVERITY_WARNING,
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36 JBIG2_SEVERITY_FATAL
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37 } Jbig2Severity;
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38
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39 typedef enum {
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40 JBIG2_OPTIONS_EMBEDDED = 1
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41 } Jbig2Options;
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43 /* forward public structure declarations */
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44 typedef struct _Jbig2Allocator Jbig2Allocator;
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45 typedef struct _Jbig2Ctx Jbig2Ctx;
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46 typedef struct _Jbig2GlobalCtx Jbig2GlobalCtx;
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47
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48 /*
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49 this is the general image structure used by the jbig2dec library
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50 images are 1 bpp, packed into rows a byte at a time. stride gives
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51 the byte offset to the next row, while width and height define
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52 the size of the image area in pixels.
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53 */
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54 typedef struct _Jbig2Image Jbig2Image;
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55 struct _Jbig2Image {
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56 uint32_t width;
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57 uint32_t height;
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58 uint32_t stride;
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59 uint8_t *data;
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60 int refcount;
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61 };
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62
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63 /* errors are returned from the library via a callback. If no callback
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64 is provided (a NULL argument is passed to jbig2_ctx_new) a default
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65 handler is used which prints fatal errors to the stderr stream. */
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66
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67 /* error callback */
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68 #define JBIG2_UNKNOWN_SEGMENT_NUMBER ~0U
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69 typedef void (*Jbig2ErrorCallback)(void *data, const char *msg, Jbig2Severity severity, uint32_t seg_idx);
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71 /* memory allocation is likewise done via a set of callbacks so that
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72 clients can better control memory usage. If a NULL is passed for
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73 this argument of jbig2_ctx_new, a default allocator based on malloc()
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74 is used. */
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75
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76 /* dynamic memory callbacks */
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77 struct _Jbig2Allocator {
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78 void *(*alloc)(Jbig2Allocator *allocator, size_t size);
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79 void (*free)(Jbig2Allocator *allocator, void *p);
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80 void *(*realloc)(Jbig2Allocator *allocator, void *p, size_t size);
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81 };
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82
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83 /* decoder context */
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84 #define jbig2_ctx_new(allocator, options, global_ctx, error_callback, error_callback_data) jbig2_ctx_new_imp((allocator), (options), (global_ctx), (error_callback), (error_callback_data), JBIG2_VERSION_MAJOR, JBIG2_VERSION_MINOR)
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85 Jbig2Ctx *jbig2_ctx_new_imp(Jbig2Allocator *allocator,
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86 Jbig2Options options,
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87 Jbig2GlobalCtx *global_ctx,
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88 Jbig2ErrorCallback error_callback,
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89 void *error_callback_data,
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90 int jbig2_version_major,
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91 int jbig2_version_minor);
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92 Jbig2Allocator *jbig2_ctx_free(Jbig2Ctx *ctx);
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93
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94 /* global context for embedded streams */
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95 Jbig2GlobalCtx *jbig2_make_global_ctx(Jbig2Ctx *ctx);
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96 Jbig2Allocator *jbig2_global_ctx_free(Jbig2GlobalCtx *global_ctx);
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97
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98 /* submit data to the decoder */
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99 int jbig2_data_in(Jbig2Ctx *ctx, const unsigned char *data, size_t size);
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100
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101 /* get the next available decoded page image. NULL means there isn't one. */
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102 Jbig2Image *jbig2_page_out(Jbig2Ctx *ctx);
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103 /* mark a returned page image as no longer needed. */
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104 void jbig2_release_page(Jbig2Ctx *ctx, Jbig2Image *image);
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105 /* mark the current page as complete, simulating an end-of-page segment (for broken streams) */
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106 int jbig2_complete_page(Jbig2Ctx *ctx);
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107
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108 #ifdef __cplusplus
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109 }
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110 #endif
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111
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112 #endif /* _JBIG2_H */