1ZZIP_ENTRY_FINDFILE(3) zziplib Function List ZZIP_ENTRY_FINDFILE(3)
2
6 zzip_entry_findfile, zzip_entry_findfirst, zzip_entry_findnext,
7 zzip_entry_free, zzip_entry_findmatch - search for files in the
8 (fseeko) zip central directory
9
11 #include <zzip/fseeko.h>
12 zzip__new__ ZZIP_ENTRY *
14 zzip_entry_findfile((FILE * disk, char *filename, ZZIP_ENTRY * _zzip_restrict entry, zzip_strcmp_fn_t compare));
15 zzip__new__ ZZIP_ENTRY * zzip_entry_findfirst((FILE * disk));
17 zzip__new__ ZZIP_ENTRY *
19 zzip_entry_findnext((ZZIP_ENTRY * _zzip_restrict entry));
20 int zzip_entry_free((ZZIP_ENTRY * entry));
22 zzip__new__ ZZIP_ENTRY *
24 zzip_entry_findmatch((FILE * disk, char *filespec, ZZIP_ENTRY * _zzip_restrict entry, zzip_fnmatch_fn_t compare, int flags));
25
27 The zzip_entry_findfile function is given a filename as an additional
28 argument, to find the disk_entry matching a given filename. The
29 compare-function is usually strcmp or strcasecmp or perhaps strcoll, if
30 null then strcmp is used. - use null as argument for "old"-entry when
31 searching the first matching entry, otherwise the last returned value
32 if you look for other entries with a special "compare" function (if
33 null then a doubled search is rather useless with this variant of
34 _findfile). If no further entry is found then null is returned and any
35 "old"-entry gets already free()d.
36 The zzip_entry_findfirst function is the first call of all the zip
38 access functions here. It contains the code to find the first entry of
39 the zip central directory. Here we require the stdio handle to
40 represent a real zip file where the disk_trailer is _last_ in the file
41 area, so that its position would be at a fixed offset from the end of
42 the file area if not for the comment field allowed to be of variable
43 length (which needs us to do a little search for the disk_tailer).
44 However, in this simple implementation we disregard any disk_trailer
45 info telling about multidisk archives, so we just return a pointer to
46 the first entry in the zip central directory of that file.
47 For an actual means, we are going to search backwards from the end of
49 the mmaped block looking for the PK-magic signature of a disk_trailer.
50 If we see one then we check the rootseek value to find the first
51 disk_entry of the root central directory. If we find the correct
52 PK-magic signature of a disk_entry over there then we assume we are
53 done and we are going to return a pointer to that label.
54 The return value is a pointer to the first zzip_disk_entry being
56 checked to be within the bounds of the file area specified by the
57 arguments. If no disk_trailer was found then null is returned, and
58 likewise we only accept a disk_trailer with a seekvalue that points to
59 a disk_entry and both parts have valid PK-magic parts. Beyond some
60 sanity check we try to catch a common brokeness with zip archives that
61 still allows us to find the start of the zip central directory.
62 The zzip_entry_findfirst function Returns null on error (errno =
64 EINVAL|ENOMEM|EBADMSG|EBADF|ENOENT)
65 The zzip_entry_findnext function takes an existing "entry" in the
67 central root directory (e.g. from zzip_entry_findfirst) and moves it to
68 point to the next entry. On error it returns 0, otherwise the old
69 entry. If no further match is found then null is returned and the entry
70 already free()d. If you want to stop searching for matches before that
71 case then please call zzip_entry_free on the cursor struct ZZIP_ENTRY.
72 the zzip_entry_free function releases the malloc()ed areas needed for
74 zzip_entry, the pointer is invalid afterwards. The zzip_entry_free
75 function has #define synonyms of zzip_entry_findlast(),
76 zzip_entry_findlastfile(), zzip_entry_findlastmatch()
77 The zzip_entry_findmatch function uses a compare-function with an
79 additional argument and it is called just like fnmatch(3) from POSIX.2
80 AD:1993), i.e. the argument filespec first and the ziplocal filename
81 second with the integer-flags put in as third to the indirect call. If
82 the platform has fnmatch available then null-compare will use that one
83 and otherwise we fall back to mere strcmp, so if you need fnmatch
84 searching then please provide an implementation somewhere else. - use
85 null as argument for "after"-entry when searching the first matching
86 entry, or the last disk_entry return-value to find the next entry
87 matching the given filespec. If no further entry is found then null is
88 returned and any "old"-entry gets already free()d.
89
91 ยท Guido Draheim <guidod@gmx.de>
92
94 Copyright (c) Guido Draheim, use under copyleft (LGPL,MPL)
95zziplib 0.13.69 ZZIP_ENTRY_FINDFILE(3)