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1 /* |
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2 zip_file_get_offset.c -- get offset of file data in archive. |
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3 Copyright (C) 1999-2015 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 <stdio.h> |
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36 #include <stdlib.h> |
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37 #include <string.h> |
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38 #include <sys/types.h> |
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39 #include <sys/stat.h> |
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40 |
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41 #include "zipint.h" |
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42 |
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43 |
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44 /* _zip_file_get_offset(za, ze): |
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45 Returns the offset of the file data for entry ze. |
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46 |
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47 On error, fills in za->error and returns 0. |
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48 */ |
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49 |
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50 zip_uint64_t |
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51 _zip_file_get_offset(const zip_t *za, zip_uint64_t idx, zip_error_t *error) |
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52 { |
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53 zip_uint64_t offset; |
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54 zip_int32_t size; |
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55 |
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56 offset = za->entry[idx].orig->offset; |
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57 |
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58 if (zip_source_seek(za->src, (zip_int64_t)offset, SEEK_SET) < 0) { |
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59 _zip_error_set_from_source(error, za->src); |
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60 return 0; |
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61 } |
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62 |
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63 /* TODO: cache? */ |
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64 if ((size=_zip_dirent_size(za->src, ZIP_EF_LOCAL, error)) < 0) |
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65 return 0; |
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66 |
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67 if (offset+(zip_uint32_t)size > ZIP_INT64_MAX) { |
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68 zip_error_set(error, ZIP_ER_SEEK, EFBIG); |
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69 return 0; |
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70 } |
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71 |
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72 return offset + (zip_uint32_t)size; |
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73 } |
