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cygwin.com Git - cygwin-apps/setup.git/blob - archive.h
2 * Copyright (c) 2001, Robert Collins.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * A copy of the GNU General Public License can be found at
12 * Written by Robert Collins <rbtcollins@hotmail.com>
19 /* this is the parent class for all archive IO operations.
25 /* The read/write the archive stream to get the archive data is flawed.
26 * The problem is that you then need a *different* gzip etc class to be able
27 * to ungzip a gzip from within an archive.
28 * The correct way is to
29 * 1) retrieve the file name.
30 * 2) the user creates their own output object.
31 * 3) the user calls extract_file (output strea,).
38 ARCHIVE_FILE_HARDLINK
,
40 ARCHIVE_FILE_DIRECTORY
45 class archive
:public io_stream
48 /* get an archive child class from an io_stream */
49 static archive
*extract (io_stream
*);
50 /* get an ouput stream for the next files from the archive.
51 * returns NULL on failure.
52 * The stream is not taken over - it will not be automatically deleted
54 virtual io_stream
*extract_file () = NULL
;
55 /* extract the next file to the given prefixURL+Path in one step, and name it with the
57 * returns 1 on failure.
59 static int extract_file (archive
*, String
const &, String
const &, String
const = String());
62 * To create a stream that will be compressed, you should open the url, and then get a new stream
63 * from compress::compress.
65 /* read data - not valid for archives (duh!)
66 * Could be made valid via the read-child-directly model
68 // virtual ssize_t read(void *buffer, size_t len) {return -1;};
69 /* provide data to (double duh!) */
70 // virtual ssize_t write(void *buffer, size_t len) { return -1;};
71 /* read data without removing it from the class's internal buffer */
72 // virtual ssize_t peek(void *buffer, size_t len);
73 // virtual long tell ();
74 /* try guessing this one */
75 // virtual int error ();
76 /* Find out the next stream name -
77 * ie for foo.tar.gz, at offset 0, next_file_name = foo.tar
78 * for foobar that is an compress, next_file_name is the next
79 * extractable filename.
80 * The way this works is that when read returns 0, you are at the end of *a* file.
81 * next_file_name will allow read to be called again, if it returns !NULL
83 virtual String
const next_file_name () = NULL
;
84 virtual archive_file_t
next_file_type () = ARCHIVE_FILE_INVALID
;
85 virtual String
const linktarget () = NULL
;
86 virtual int skip_file () = 0;
87 /* if you are still needing these hints... give up now! */
88 // virtual ~compress ();
90 void operator= (const archive
&);
92 archive (const archive
&);
97 #endif /* _ARCHIVE_H_ */
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