Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/source/fitz/compress.c @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1 // Copyright (C) 2004-2021 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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24
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25 #include "z-imp.h"
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27 #include <limits.h>
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29 void fz_deflate(fz_context *ctx, unsigned char *dest, size_t *destLen, const unsigned char *source, size_t sourceLen, fz_deflate_level level)
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30 {
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31 z_stream stream;
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32 int err;
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33 size_t left;
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34
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35 left = *destLen;
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36 *destLen = 0;
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37
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38 stream.zalloc = fz_zlib_alloc;
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39 stream.zfree = fz_zlib_free;
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40 stream.opaque = ctx;
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41
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42 err = deflateInit(&stream, (int)level);
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43 if (err != Z_OK)
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44 fz_throw(ctx, FZ_ERROR_LIBRARY, "deflateInit failed: %d", err);
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46 stream.next_out = dest;
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47 stream.avail_out = 0;
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48 stream.next_in = (z_const Bytef *)source;
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49 stream.avail_in = 0;
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50
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51 do {
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52 if (stream.avail_out == 0) {
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53 stream.avail_out = left > UINT_MAX ? UINT_MAX : (uInt)left;
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54 left -= stream.avail_out;
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55 }
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56 if (stream.avail_in == 0) {
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57 stream.avail_in = sourceLen > UINT_MAX ? UINT_MAX : (uInt)sourceLen;
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58 sourceLen -= stream.avail_in;
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59 }
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60 err = deflate(&stream, sourceLen ? Z_NO_FLUSH : Z_FINISH);
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61 } while (err == Z_OK);
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62
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63 /* We might have problems if the compressed length > uLong sized. Tough, for now. */
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64 *destLen = stream.total_out;
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65 deflateEnd(&stream);
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66 if (err != Z_STREAM_END)
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67 fz_throw(ctx, FZ_ERROR_LIBRARY, "deflate error: %d", err);
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68 }
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69
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70 unsigned char *fz_new_deflated_data(fz_context *ctx, size_t *compressed_length, const unsigned char *source, size_t source_length, fz_deflate_level level)
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71 {
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72 size_t bound = fz_deflate_bound(ctx, source_length);
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73 unsigned char *cdata = Memento_label(fz_malloc(ctx, bound), "deflated_data");
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74 *compressed_length = 0;
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75
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76 fz_try(ctx)
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77 fz_deflate(ctx, cdata, &bound, source, source_length, level);
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78 fz_catch(ctx)
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79 {
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80 fz_free(ctx, cdata);
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81 fz_rethrow(ctx);
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82 }
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83
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84 *compressed_length = bound;
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85 return cdata;
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86 }
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87
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88 unsigned char *fz_new_deflated_data_from_buffer(fz_context *ctx, size_t *compressed_length, fz_buffer *buffer, fz_deflate_level level)
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89 {
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90 unsigned char *data;
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91 size_t size = fz_buffer_storage(ctx, buffer, &data);
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92
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93 if (size == 0 || data == NULL)
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94 {
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95 *compressed_length = 0;
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96 return NULL;
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97 }
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98
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
99 return fz_new_deflated_data(ctx, compressed_length, data, size, level);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
100 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
101
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
102 size_t fz_deflate_bound(fz_context *ctx, size_t size)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
103 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
104 /* Copied from zlib to account for size_t vs uLong */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
105 return size + (size >> 12) + (size >> 14) + (size >> 25) + 13;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
106 }