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annotate src/libmlk-core/core/zfile.c @ 369:1e06f871dc63

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core: split action and action_stack
author David Demelier <markand@malikania.fr>
date Sun, 24 Oct 2021 17:33:12 +0200
parents 12367bfc2df6
children 460c78706989
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 * zfile.c -- load potentially ZSTD compressed file
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3 *
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4 * Copyright (c) 2020-2021 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #include "config.h"
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20
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21 #include <sys/stat.h>
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22 #include <assert.h>
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23 #include <errno.h>
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24 #include <fcntl.h>
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25 #include <stdint.h>
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26 #include <stdlib.h>
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27 #include <string.h>
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28
362
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29 #if defined(_WIN32)
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30 # include <io.h>
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31 #else
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32 # include <unistd.h>
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33 #endif
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34
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35 /*
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36 * If not enabled, we still need to check if a file is in zstandard so we use
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37 * the magic number defined in the zstd.h file or copy it if zstd is disabled.
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38 */
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39 #if defined(MLK_WITH_ZSTD)
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40 # include <zstd.h>
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41 #else
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42 # define ZSTD_MAGICNUMBER 0xFD2FB528
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43 #endif
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44
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45 /* Windows thing. */
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46 #if !defined(O_BINARY)
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47 # define O_BINARY 0
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48 #endif
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49
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50 #include <port/port.h>
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51
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52 #include "zfile.h"
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53
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54 static int
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55 is_zstd(int fd)
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56 {
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57 uint32_t magic = 0;
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58
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59 read(fd, &magic, sizeof (magic));
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60 lseek(fd, 0, SEEK_SET);
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61
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62 #if SDL_BYTEORDER != SDL_LIL_ENDIAN
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63 magic = SDL_Swap32(magic);
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64 #endif
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65
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66 return magic == ZSTD_MAGICNUMBER;
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67 }
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68
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69 static int
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70 decompress(int fd, struct zfile *zf)
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71 {
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72 #if defined(MLK_WITH_ZSTD)
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73 char *in = NULL;
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74 unsigned long long datasz;
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75 struct stat st;
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76 ssize_t nr;
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77
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78 /* Load uncompressed data. */
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79 if (fstat(fd, &st) < 0)
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80 goto fail;
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81 if (!(in = calloc(1, st.st_size)) || (nr = read(fd, in, st.st_size)) != st.st_size)
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82 goto fail;
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83
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84 switch ((datasz = ZSTD_getFrameContentSize(in, st.st_size))) {
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85 case ZSTD_CONTENTSIZE_ERROR:
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86 errno = EINVAL;
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87 goto fail;
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88 case ZSTD_CONTENTSIZE_UNKNOWN:
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89 errno = ENOTSUP;
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90 goto fail;
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91 default:
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92 break;
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93 }
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94
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95 /* Finally decompress. */
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96 if (!(zf->data = calloc(1, datasz + 1)))
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97 goto fail;
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98 if (ZSTD_isError(ZSTD_decompress(zf->data, datasz, in, st.st_size))) {
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99 errno = EINVAL;
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100 goto fail;
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101 }
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102 if (!(zf->fp = port_fmemopen(zf->data, datasz, "r")))
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103 goto fail;
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104
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105 close(fd);
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106 free(in);
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107
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108 return 0;
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109
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110 fail:
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111 close(fd);
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112 free(zf->data);
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113 free(in);
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114
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115 return -1;
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116 #else
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117 (void)fd;
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118 (void)zf;
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119
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120 errno = ENOTSUP;
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121
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122 return -1;
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123 #endif
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124 }
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125
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126 static int
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127 reopen(int fd, struct zfile *zf)
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128 {
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129 if (!(zf->fp = fdopen(fd, "r")))
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130 return close(fd), -1;
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131
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132 return 0;
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133 }
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134
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135 int
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136 zfile_open(struct zfile *zf, const char *path)
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137 {
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138 assert(zf);
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139 assert(path);
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140
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141 int fd;
295
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142
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143 memset(zf, 0, sizeof (*zf));
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144
309
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145 if ((fd = open(path, O_RDONLY | O_BINARY)) < 0)
295
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146 return -1;
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147
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148 return is_zstd(fd) ? decompress(fd, zf) : reopen(fd, zf);
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149 }
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150
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151 void
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152 zfile_close(struct zfile *zf)
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153 {
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154 assert(zf);
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155
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156 free(zf->data);
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157
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158 if (zf->fp)
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159 fclose(zf->fp);
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160
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161 memset(zf, 0, sizeof (*zf));
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162 }