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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
30class 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
51class 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