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4680 | right-hear | 1 | /* |
2 | jbig2dec |
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3 | |||
4 | Copyright (C) 2002 Artifex Software, Inc. |
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5 | |||
6 | This software is distributed under license and may not |
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7 | be copied, modified or distributed except as expressly |
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8 | authorized under the terms of the license contained in |
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9 | the file LICENSE in this distribution. |
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10 | |||
11 | For further licensing information refer to http://artifex.com/ or |
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12 | contact Artifex Software, Inc., 7 Mt. Lassen Drive - Suite A-134, |
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13 | San Rafael, CA 94903, U.S.A., +1(415)492-9861. |
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14 | */ |
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15 | |||
16 | /* library internals */ |
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17 | |||
18 | typedef uint8_t byte; |
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19 | typedef int bool; |
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20 | |||
21 | #ifndef TRUE |
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22 | #define TRUE 1 |
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23 | #endif |
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24 | #ifndef FALSE |
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25 | #define FALSE 0 |
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26 | #endif |
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27 | |||
28 | #ifndef NULL |
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29 | #define NULL ((void*)0) |
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30 | #endif |
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31 | |||
32 | typedef enum { |
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33 | JBIG2_FILE_HEADER, |
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34 | JBIG2_FILE_SEQUENTIAL_HEADER, |
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35 | JBIG2_FILE_SEQUENTIAL_BODY, |
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36 | JBIG2_FILE_RANDOM_HEADERS, |
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37 | JBIG2_FILE_RANDOM_BODIES, |
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38 | JBIG2_FILE_EOF |
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39 | } Jbig2FileState; |
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40 | |||
41 | struct _Jbig2Ctx { |
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42 | Jbig2Allocator *allocator; |
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43 | Jbig2Options options; |
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44 | const Jbig2Ctx *global_ctx; |
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45 | Jbig2ErrorCallback error_callback; |
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46 | void *error_callback_data; |
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47 | |||
48 | byte *buf; |
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49 | size_t buf_size; |
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50 | unsigned int buf_rd_ix; |
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51 | unsigned int buf_wr_ix; |
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52 | |||
53 | Jbig2FileState state; |
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54 | |||
55 | uint8_t file_header_flags; |
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56 | int32_t n_pages; |
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57 | |||
58 | int n_segments_max; |
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59 | Jbig2Segment **segments; |
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60 | int n_segments; /* index of last segment header parsed */ |
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61 | int segment_index; /* index of last segment body parsed */ |
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62 | |||
63 | /* list of decoded pages, including the one in progress, |
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64 | currently stored as a contiguous, 0-indexed array. */ |
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65 | int current_page; |
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66 | int max_page_index; |
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67 | Jbig2Page *pages; |
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68 | }; |
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69 | |||
70 | int32_t |
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71 | jbig2_get_int32 (const byte *buf); |
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72 | |||
73 | int16_t |
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74 | jbig2_get_int16 (const byte *buf); |
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75 | |||
76 | /* dynamic memory management */ |
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77 | void * |
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78 | jbig2_alloc (Jbig2Allocator *allocator, size_t size); |
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79 | |||
80 | void |
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81 | jbig2_free (Jbig2Allocator *allocator, void *p); |
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82 | |||
83 | void * |
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84 | jbig2_realloc (Jbig2Allocator *allocator, void *p, size_t size); |
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85 | |||
86 | #define jbig2_new(ctx, t, size) ((t *)jbig2_alloc(ctx->allocator, (size) * sizeof(t))) |
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87 | |||
88 | #define jbig2_renew(ctx, p, t, size) ((t *)jbig2_realloc(ctx->allocator, (p), (size) * sizeof(t))) |
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89 | |||
90 | int |
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91 | jbig2_error (Jbig2Ctx *ctx, Jbig2Severity severity, int32_t seg_idx, |
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92 | const char *fmt, ...); |
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93 | |||
94 | /* the page structure handles decoded page |
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95 | results. it's allocated by a 'page info' |
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96 | segement and marked complete by an 'end of page' |
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97 | segment. |
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98 | */ |
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99 | typedef enum { |
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100 | JBIG2_PAGE_FREE, |
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101 | JBIG2_PAGE_NEW, |
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102 | JBIG2_PAGE_COMPLETE, |
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103 | JBIG2_PAGE_RETURNED, |
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104 | JBIG2_PAGE_RELEASED |
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105 | } Jbig2PageState; |
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106 | |||
107 | struct _Jbig2Page { |
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108 | Jbig2PageState state; |
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109 | uint32_t number; |
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110 | uint32_t height, width; /* in pixels */ |
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111 | uint32_t x_resolution, |
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112 | y_resolution; /* in pixels per meter */ |
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113 | uint16_t stripe_size; |
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114 | bool striped; |
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115 | int end_row; |
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116 | uint8_t flags; |
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117 | Jbig2Image *image; |
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118 | }; |
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119 | |||
120 | int jbig2_page_info (Jbig2Ctx *ctx, Jbig2Segment *segment, const uint8_t *segment_data); |
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121 | int jbig2_end_of_stripe(Jbig2Ctx *ctx, Jbig2Segment *segment, const uint8_t *segment_data); |
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122 | int jbig2_end_of_page(Jbig2Ctx *ctx, Jbig2Segment *segment, const uint8_t *segment_data); |
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123 | int jbig2_extension_segment(Jbig2Ctx *ctx, Jbig2Segment *segment, const uint8_t *segment_data); |
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124 | |||
125 | typedef enum { |
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126 | JBIG2_COMPOSE_OR = 0, |
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127 | JBIG2_COMPOSE_AND = 1, |
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128 | JBIG2_COMPOSE_XOR = 2, |
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129 | JBIG2_COMPOSE_XNOR = 3, |
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130 | JBIG2_COMPOSE_REPLACE = 4 |
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131 | } Jbig2ComposeOp; |
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132 | |||
133 | int jbig2_image_compose(Jbig2Ctx *ctx, Jbig2Image *dst, Jbig2Image *src, int x, int y, Jbig2ComposeOp op); |
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134 | int jbig2_page_add_result(Jbig2Ctx *ctx, Jbig2Page *page, Jbig2Image *src, int x, int y, Jbig2ComposeOp op); |
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135 | |||
136 | /* region segment info */ |
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137 | |||
138 | typedef struct { |
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139 | int32_t width; |
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140 | int32_t height; |
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141 | int32_t x; |
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142 | int32_t y; |
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143 | Jbig2ComposeOp op; |
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144 | uint8_t flags; |
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145 | } Jbig2RegionSegmentInfo; |
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146 | |||
147 | void jbig2_get_region_segment_info(Jbig2RegionSegmentInfo *info, const uint8_t *segment_data); |
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148 | int jbig2_text_region(Jbig2Ctx *ctx, Jbig2Segment *segment, const uint8_t *segment_data); |
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149 | |||
150 | /* 7.4 */ |
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151 | int jbig2_immediate_generic_region(Jbig2Ctx *ctx, Jbig2Segment *segment, |
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152 | const uint8_t *segment_data); |
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153 | int jbig2_refinement_region(Jbig2Ctx *ctx, Jbig2Segment *segment, |
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154 | const byte *segment_data); |
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155 | |||
156 | int jbig2_pattern_dictionary(Jbig2Ctx *ctx, Jbig2Segment *segment, |
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157 | const byte *segment_data); |
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158 | int jbig2_halftone_region(Jbig2Ctx *ctx, Jbig2Segment *segment, |
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159 | const byte *segment_data); |
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160 | |||
161 | |||
162 | /* The word stream design is a compromise between simplicity and |
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163 | trying to amortize the number of method calls. Each ::get_next_word |
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164 | invocation pulls 4 bytes from the stream, packed big-endian into a |
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165 | 32 bit word. The offset argument is provided as a convenience. It |
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166 | begins at 0 and increments by 4 for each successive invocation. */ |
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167 | typedef struct _Jbig2WordStream Jbig2WordStream; |
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168 | |||
169 | struct _Jbig2WordStream { |
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170 | uint32_t (*get_next_word) (Jbig2WordStream *self, int offset); |
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171 | }; |
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172 | |||
173 | Jbig2WordStream * |
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174 | jbig2_word_stream_buf_new(Jbig2Ctx *ctx, const byte *data, size_t size); |
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175 | |||
176 | void |
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177 | jbig2_word_stream_buf_free(Jbig2Ctx *ctx, Jbig2WordStream *ws); |