Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/jbig2dec/jbig2_arith_iaid.c @ 21:2f43e400f144

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Provide an "all" target to build both the sdist and the wheel
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 10:28:53 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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10
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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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19
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20 /* Annex A.3 */
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21
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22 #ifdef HAVE_CONFIG_H
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23 #include "config.h"
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24 #endif
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25 #include "os_types.h"
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27 #include <stddef.h>
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28 #include <string.h> /* memset() */
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30 #ifdef VERBOSE
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31 #include <stdio.h> /* for debug printing only */
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32 #endif
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34 #include "jbig2.h"
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35 #include "jbig2_priv.h"
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36 #include "jbig2_arith.h"
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37 #include "jbig2_arith_iaid.h"
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39 struct _Jbig2ArithIaidCtx {
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40 uint8_t SBSYMCODELEN;
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41 Jbig2ArithCx *IAIDx;
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42 };
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44 Jbig2ArithIaidCtx *
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45 jbig2_arith_iaid_ctx_new(Jbig2Ctx *ctx, uint8_t SBSYMCODELEN)
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46 {
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47 Jbig2ArithIaidCtx *result;
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48 size_t ctx_size;
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49
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50 if (sizeof(ctx_size) * 8 <= SBSYMCODELEN)
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51 {
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52 jbig2_error(ctx, JBIG2_SEVERITY_FATAL, JBIG2_UNKNOWN_SEGMENT_NUMBER, "requested IAID arithmetic coding state size too large");
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53 return NULL;
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54 }
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56 ctx_size = (size_t) 1U << SBSYMCODELEN;
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57
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58 result = jbig2_new(ctx, Jbig2ArithIaidCtx, 1);
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59 if (result == NULL) {
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60 jbig2_error(ctx, JBIG2_SEVERITY_FATAL, JBIG2_UNKNOWN_SEGMENT_NUMBER, "failed to allocate IAID arithmetic coding state");
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61 return NULL;
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62 }
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63
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64 result->SBSYMCODELEN = SBSYMCODELEN;
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65 result->IAIDx = jbig2_new(ctx, Jbig2ArithCx, ctx_size);
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66 if (result->IAIDx == NULL)
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67 {
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68 jbig2_free(ctx->allocator, result);
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69 jbig2_error(ctx, JBIG2_SEVERITY_FATAL, JBIG2_UNKNOWN_SEGMENT_NUMBER, "failed to allocate symbol ID in IAID arithmetic coding state");
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70 return NULL;
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71 }
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72
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73 memset(result->IAIDx, 0, ctx_size);
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74 return result;
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75 }
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76
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77 /* A.3 */
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78 /* Return value: -1 on error, 0 on normal value */
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79 int
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80 jbig2_arith_iaid_decode(Jbig2Ctx *ctx, Jbig2ArithIaidCtx *actx, Jbig2ArithState *as, int32_t *p_result)
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81 {
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82 Jbig2ArithCx *IAIDx = actx->IAIDx;
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83 uint8_t SBSYMCODELEN = actx->SBSYMCODELEN;
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84 /* A.3 (1) */
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85 int PREV = 1;
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86 int D;
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87 int i;
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88
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89 /* A.3 (2) */
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90 for (i = 0; i < SBSYMCODELEN; i++) {
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91 D = jbig2_arith_decode(ctx, as, &IAIDx[PREV]);
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92 if (D < 0)
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93 return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, JBIG2_UNKNOWN_SEGMENT_NUMBER, "failed to decode IAIDx code");
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94 #ifdef VERBOSE
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95 fprintf(stderr, "IAID%x: D = %d\n", PREV, D);
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96 #endif
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97 PREV = (PREV << 1) | D;
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98 }
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99 /* A.3 (3) */
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100 PREV -= 1 << SBSYMCODELEN;
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101 #ifdef VERBOSE
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102 fprintf(stderr, "IAID result: %d\n", PREV);
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103 #endif
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104 *p_result = PREV;
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105 return 0;
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106 }
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107
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108 void
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109 jbig2_arith_iaid_ctx_free(Jbig2Ctx *ctx, Jbig2ArithIaidCtx *iax)
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110 {
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111 if (iax != NULL) {
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112 jbig2_free(ctx->allocator, iax->IAIDx);
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113 jbig2_free(ctx->allocator, iax);
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114 }
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115 }