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1 /* |
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2 zip_file_set_comment.c -- set comment for file in archive |
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3 Copyright (C) 2006-2014 Dieter Baron and Thomas Klausner |
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4 |
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5 This file is part of libzip, a library to manipulate ZIP archives. |
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6 The authors can be contacted at <libzip@nih.at> |
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7 |
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8 Redistribution and use in source and binary forms, with or without |
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9 modification, are permitted provided that the following conditions |
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10 are met: |
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11 1. Redistributions of source code must retain the above copyright |
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12 notice, this list of conditions and the following disclaimer. |
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13 2. Redistributions in binary form must reproduce the above copyright |
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14 notice, this list of conditions and the following disclaimer in |
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15 the documentation and/or other materials provided with the |
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16 distribution. |
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17 3. The names of the authors may not be used to endorse or promote |
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18 products derived from this software without specific prior |
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19 written permission. |
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20 |
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21 THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS |
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22 OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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23 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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24 ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY |
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25 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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26 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
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27 GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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28 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER |
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29 IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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30 OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN |
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31 IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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32 */ |
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33 |
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34 |
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35 #include <stdlib.h> |
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36 |
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37 #include "zipint.h" |
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38 |
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39 |
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40 ZIP_EXTERN int |
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41 zip_file_set_comment(zip_t *za, zip_uint64_t idx, |
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42 const char *comment, zip_uint16_t len, zip_flags_t flags) |
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43 { |
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44 zip_entry_t *e; |
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45 zip_string_t *cstr; |
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46 int changed; |
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47 |
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48 if (_zip_get_dirent(za, idx, 0, NULL) == NULL) |
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49 return -1; |
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50 |
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51 if (ZIP_IS_RDONLY(za)) { |
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52 zip_error_set(&za->error, ZIP_ER_RDONLY, 0); |
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53 return -1; |
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54 } |
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55 |
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56 if (len > 0 && comment == NULL) { |
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57 zip_error_set(&za->error, ZIP_ER_INVAL, 0); |
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58 return -1; |
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59 } |
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60 |
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61 if (len > 0) { |
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62 if ((cstr=_zip_string_new((const zip_uint8_t *)comment, len, flags, &za->error)) == NULL) |
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63 return -1; |
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64 if ((flags & ZIP_FL_ENCODING_ALL) == ZIP_FL_ENC_GUESS && _zip_guess_encoding(cstr, ZIP_ENCODING_UNKNOWN) == ZIP_ENCODING_UTF8_GUESSED) |
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65 cstr->encoding = ZIP_ENCODING_UTF8_KNOWN; |
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66 } |
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67 else |
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68 cstr = NULL; |
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69 |
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70 e = za->entry+idx; |
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71 |
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72 if (e->changes) { |
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73 _zip_string_free(e->changes->comment); |
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74 e->changes->comment = NULL; |
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75 e->changes->changed &= ~ZIP_DIRENT_COMMENT; |
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76 } |
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77 |
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78 if (e->orig && e->orig->comment) |
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79 changed = !_zip_string_equal(e->orig->comment, cstr); |
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80 else |
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81 changed = (cstr != NULL); |
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82 |
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83 if (changed) { |
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84 if (e->changes == NULL) { |
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85 if ((e->changes=_zip_dirent_clone(e->orig)) == NULL) { |
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86 zip_error_set(&za->error, ZIP_ER_MEMORY, 0); |
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87 _zip_string_free(cstr); |
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88 return -1; |
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89 } |
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90 } |
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91 e->changes->comment = cstr; |
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92 e->changes->changed |= ZIP_DIRENT_COMMENT; |
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93 } |
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94 else { |
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95 _zip_string_free(cstr); |
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96 if (e->changes && e->changes->changed == 0) { |
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97 _zip_dirent_free(e->changes); |
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98 e->changes = NULL; |
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99 } |
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100 } |
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101 |
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102 return 0; |
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103 } |
