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1 | // -*- mode: cpp; mode: fold -*- | |
2 | // Description /*{{{*/ | |
3 | // $Id: tagfile.h,v 1.9 1998/08/26 04:52:24 jgg Exp $ | |
4 | /* ###################################################################### | |
5 | ||
6 | Fast scanner for RFC-822 type header information | |
7 | ||
8 | This parser handles Debian package files (and others). Their form is | |
9 | RFC-822 type header fields in groups seperated by a blank line. | |
10 | ||
11 | The parser reads the file and provides methods to step linearly | |
12 | over it or to jump to a pre-recorded start point and read that record. | |
13 | ||
14 | A second class is used to perform pre-parsing of the record. It works | |
15 | by indexing the start of each header field and providing lookup | |
16 | functions for header fields. | |
17 | ||
18 | ##################################################################### */ | |
19 | /*}}}*/ | |
20 | // Header section: pkglib | |
21 | #ifndef PKGLIB_TAGFILE_H | |
22 | #define PKGLIB_TAGFILE_H | |
23 | ||
24 | #ifdef __GNUG__ | |
25 | #pragma interface "apt-pkg/tagfile.h" | |
26 | #endif | |
27 | ||
28 | #include <apt-pkg/fileutl.h> | |
29 | ||
30 | class pkgTagSection | |
31 | { | |
32 | const char *Section; | |
33 | const char *Stop; | |
34 | ||
35 | // We have a limit of 256 tags per section. | |
36 | unsigned short Indexes[256]; | |
37 | unsigned int TagCount; | |
38 | ||
39 | public: | |
40 | ||
41 | inline bool operator ==(const pkgTagSection &rhs) {return Section == rhs.Section;}; | |
42 | inline bool operator !=(const pkgTagSection &rhs) {return Section != rhs.Section;}; | |
43 | ||
44 | bool Find(const char *Tag,const char *&Start, const char *&End); | |
45 | bool Scan(const char *Start,unsigned long MaxLength); | |
46 | inline unsigned long size() {return Stop - Section;}; | |
47 | ||
48 | pkgTagSection() : Section(0), Stop(0) {}; | |
49 | }; | |
50 | ||
51 | class pkgTagFile | |
52 | { | |
53 | FileFd &Fd; | |
54 | char *Buffer; | |
55 | char *Start; | |
56 | char *End; | |
57 | unsigned long Left; | |
58 | unsigned long iOffset; | |
59 | unsigned long Size; | |
60 | ||
61 | bool Fill(); | |
62 | ||
63 | public: | |
64 | ||
65 | bool Step(pkgTagSection &Section); | |
66 | inline unsigned long Offset() {return iOffset;}; | |
67 | bool Jump(pkgTagSection &Tag,unsigned long Offset); | |
68 | ||
69 | pkgTagFile(FileFd &F,unsigned long Size = 32*1024); | |
70 | }; | |
71 | ||
72 | #endif |