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1 /* |
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2 * image.c -- image definition |
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3 * |
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4 * Copyright (c) 2020 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 <assert.h> |
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20 #include <stdlib.h> |
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21 #include <string.h> |
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22 |
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23 #include <magic.h> |
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24 |
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25 #include "image.h" |
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26 #include "log.h" |
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27 #include "util.h" |
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28 |
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29 static const char *mimes[] = { |
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30 "image/bmp", |
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31 "image/jpeg", |
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32 "image/gif", |
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33 "image/png", |
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34 "image/svg+xml", |
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35 "image/tiff", |
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36 "image/webp" |
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37 }; |
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38 |
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39 void |
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40 image_finish(struct image *image) |
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41 { |
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42 assert(image); |
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43 |
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44 free(image->id); |
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45 free(image->title); |
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46 free(image->author); |
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47 free(image->data); |
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48 free(image->filename); |
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49 memset(image, 0, sizeof (*image)); |
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50 } |
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51 |
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52 bool |
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53 image_isvalid(const void *src, size_t srcsz) |
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54 { |
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55 assert(src); |
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56 |
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57 magic_t cookie; |
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58 bool ret = false; |
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59 const char *mime; |
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60 |
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61 /* |
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62 * If we're unable to load the libmagic we assume it's valid image and |
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63 * let the browser show an invalid thing instead. |
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64 */ |
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65 if (!(cookie = magic_open(MAGIC_MIME_TYPE))) |
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66 return true; |
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67 |
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68 magic_load(cookie, NULL); |
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69 |
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70 if ((mime = magic_buffer(cookie, src, srcsz))) { |
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71 for (size_t i = 0; i < NELEM(mimes); ++i) { |
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72 if (strcmp(mime, mimes[i]) == 0) { |
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73 ret = true; |
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74 break; |
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75 } |
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76 } |
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77 } |
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78 |
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79 magic_close(cookie); |
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80 |
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81 return ret; |
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82 } |
