Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/source/fitz/random.c @ 46:7ee69f120f19 default tip

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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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2
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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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22
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23 #include "mupdf/fitz.h"
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24
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25 /* The pseudo-random number generator in this file is based on the MIT licensed
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26 * implementation in musl libc. */
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27
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28 #include <string.h>
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30 /* The seed is initialized in context.c as follows:
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31 * static uint16_t __seed48[7] = { 0, 0, 0, 0xe66d, 0xdeec, 0x5, 0xb };
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32 */
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33
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34 static uint64_t fz_rand48_step(uint16_t *xi, uint16_t *lc)
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35 {
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36 uint64_t a, x;
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37 x = xi[0] | (xi[1]+0U)<<16 | (xi[2]+0ULL)<<32;
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38 a = lc[0] | (lc[1]+0U)<<16 | (lc[2]+0ULL)<<32;
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39 x = a*x + lc[3];
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40 xi[0] = x;
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41 xi[1] = x>>16;
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42 xi[2] = x>>32;
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43 return x & 0xffffffffffffull;
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44 }
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45
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46 double fz_erand48(fz_context *ctx, uint16_t s[3])
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47 {
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48 union {
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49 uint64_t u;
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50 double f;
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51 } x = { 0x3ff0000000000000ULL | fz_rand48_step(s, ctx->seed48+3)<<4 };
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52 return x.f - 1.0;
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53 }
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54
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55 /*
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56 Pseudo-random numbers using a linear congruential algorithm and 48-bit
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57 integer arithmetic.
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58 */
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59 double fz_drand48(fz_context *ctx)
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60 {
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61 return fz_erand48(ctx, ctx->seed48);
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62 }
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63
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64 int32_t fz_nrand48(fz_context *ctx, uint16_t s[3])
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65 {
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66 return fz_rand48_step(s, ctx->seed48+3) >> 17;
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67 }
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68
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69 int32_t fz_lrand48(fz_context *ctx)
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70 {
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71 return fz_nrand48(ctx, ctx->seed48);
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72 }
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73
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74 int32_t fz_jrand48(fz_context *ctx, uint16_t s[3])
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75 {
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76 return (int32_t)(fz_rand48_step(s, ctx->seed48+3) >> 16);
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77 }
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78
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79 int32_t fz_mrand48(fz_context *ctx)
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80 {
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81 return fz_jrand48(ctx, ctx->seed48);
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82 }
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83
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84 void fz_lcong48(fz_context *ctx, uint16_t p[7])
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85 {
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86 memcpy(ctx->seed48, p, sizeof ctx->seed48);
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87 }
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88
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89 uint16_t *fz_seed48(fz_context *ctx, uint16_t *s)
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90 {
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91 static uint16_t p[3];
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92 memcpy(p, ctx->seed48, sizeof p);
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93 memcpy(ctx->seed48, s, sizeof p);
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94 return p;
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95 }
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96
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97 void fz_srand48(fz_context *ctx, int32_t seed)
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98 {
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99 uint16_t p[3] = { 0x330e, seed, seed>>16 };
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100 fz_seed48(ctx, p);
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101 }
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102
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103 void fz_memrnd(fz_context *ctx, unsigned char *data, int len)
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104 {
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105 #ifdef CLUSTER
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106 memset(data, 0x55, len);
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107 #else
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108 while (len-- > 0)
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109 *data++ = (unsigned char)fz_lrand48(ctx);
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110 #endif
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111 }