Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/source/fitz/brotli.c @ 38:8934ac156ef5

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Allow to build with the PyPI package "clang" instead of "libclang". 1. It seems to be maintained. 2. In the FreeBSD base system there is no pre-built libclang.so. If you need this library you have to install llvm from ports additionally. 2. On FreeBSD there is no pre-built wheel "libclang" with a packaged libclang.so.
author Franz Glasner <fzglas.hg@dom66.de>
date Tue, 23 Sep 2025 10:27:15 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2
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1 // Copyright (C) 2004-2025 Artifex Software, Inc.
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2 //
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3 // This file is part of MuPDF.
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4 //
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5 // MuPDF is free software: you can redistribute it and/or modify it under the
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6 // terms of the GNU Affero General Public License as published by the Free
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7 // Software Foundation, either version 3 of the License, or (at your option)
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8 // any later version.
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9 //
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10 // MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
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11 // WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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12 // FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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13 // details.
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14 //
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15 // You should have received a copy of the GNU Affero General Public License
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16 // along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
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17 //
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18 // Alternative licensing terms are available from the licensor.
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19 // For commercial licensing, see <https://www.artifex.com/> or contact
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20 // Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
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21 // CA 94129, USA, for further information.
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23 #include "mupdf/fitz.h"
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25 #if FZ_ENABLE_BROTLI
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27 #include "brotli/encode.h"
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29 #include <limits.h>
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31 static void *
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32 my_brotli_alloc(void *opaque, size_t size)
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33 {
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34 return fz_malloc_no_throw((fz_context *)opaque, size);
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35 }
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37 static void
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38 my_brotli_free(void *opaque, void *ptr)
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39 {
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40 fz_free((fz_context *)opaque, ptr);
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41 }
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43 void fz_compress_brotli(fz_context *ctx, unsigned char *dest, size_t *dest_len, const unsigned char *source, size_t source_len, fz_brotli_level level)
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44 {
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45 int ok;
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46 BrotliEncoderState *enc_state;
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47 unsigned char *outp = dest;
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48 size_t avail_out = *dest_len;
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49
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50 enc_state = BrotliEncoderCreateInstance(my_brotli_alloc, my_brotli_free, ctx);
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52 if (!BrotliEncoderSetParameter(enc_state, BROTLI_PARAM_QUALITY, level))
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53 {
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54 BrotliEncoderDestroyInstance(enc_state);
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55 fz_throw(ctx, FZ_ERROR_LIBRARY, "Brotli compression failed");
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56 }
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58 do {
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59 ok = BrotliEncoderCompressStream(enc_state,
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60 (source_len > 0 ? BROTLI_OPERATION_PROCESS : BROTLI_OPERATION_FINISH),
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61 &source_len,
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62 &source,
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63 &avail_out,
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64 &outp,
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65 NULL);
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66 } while (ok && !BrotliEncoderIsFinished(enc_state));
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67
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68 if (!ok)
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69 {
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70 BrotliEncoderDestroyInstance(enc_state);
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71 fz_throw(ctx, FZ_ERROR_LIBRARY, "Brotli compression failed");
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72 }
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73 *dest_len = outp - dest;
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74
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75 BrotliEncoderDestroyInstance(enc_state);
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76 }
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78 unsigned char *fz_new_brotli_data(fz_context *ctx, size_t *compressed_length, const unsigned char *source, size_t source_length, fz_brotli_level level)
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79 {
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80 size_t bound = fz_brotli_bound(ctx, source_length);
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81 unsigned char *cdata = Memento_label(fz_malloc(ctx, bound), "brotli_data");
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82 *compressed_length = 0;
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83
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84 fz_try(ctx)
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85 fz_compress_brotli(ctx, cdata, &bound, source, source_length, level);
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86 fz_catch(ctx)
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87 {
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88 fz_free(ctx, cdata);
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89 fz_rethrow(ctx);
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90 }
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91
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92 *compressed_length = bound;
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93 return cdata;
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94 }
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95
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96 unsigned char *fz_new_brotli_data_from_buffer(fz_context *ctx, size_t *compressed_length, fz_buffer *buffer, fz_brotli_level level)
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97 {
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98 unsigned char *data;
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99 size_t size = fz_buffer_storage(ctx, buffer, &data);
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100
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101 if (size == 0 || data == NULL)
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102 {
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103 *compressed_length = 0;
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104 return NULL;
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105 }
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106
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107 return fz_new_brotli_data(ctx, compressed_length, data, size, level);
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108 }
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109
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110 size_t fz_brotli_bound(fz_context *ctx, size_t size)
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111 {
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112 return BrotliEncoderMaxCompressedSize(size);
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113 }
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114
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115 #else
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116
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117 size_t fz_brotli_bound(fz_context *ctx, size_t size)
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118 {
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119 return size;
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120 }
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121
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122 void fz_compress_brotli(fz_context *ctx, unsigned char *dest, size_t *dest_len, const unsigned char *source, size_t source_len, fz_brotli_level level)
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123 {
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124 fz_throw(ctx, FZ_ERROR_UNSUPPORTED, "brotli compression not enabled");
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125 }
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126
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127 unsigned char *fz_new_brotli_data_from_buffer(fz_context *ctx, size_t *compressed_length, fz_buffer *buffer, fz_brotli_level level)
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128 {
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129 fz_throw(ctx, FZ_ERROR_UNSUPPORTED, "brotli compression not enabled");
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130 return NULL;
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131 }
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132
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133 unsigned char *fz_new_brotli_data(fz_context *ctx, size_t *compressed_length, const unsigned char *source, size_t source_length, fz_brotli_level level)
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134 {
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135 fz_throw(ctx, FZ_ERROR_UNSUPPORTED, "brotli compression not enabled");
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136 return NULL;
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137 }
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138
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139 #endif