2
* Copyright (c) 2003-2007 Tim Kientzle
5
* Redistribution and use in source and binary forms, with or without
6
* modification, are permitted provided that the following conditions
8
* 1. Redistributions of source code must retain the above copyright
9
* notice, this list of conditions and the following disclaimer.
10
* 2. Redistributions in binary form must reproduce the above copyright
11
* notice, this list of conditions and the following disclaimer in the
12
* documentation and/or other materials provided with the distribution.
14
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
15
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
18
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25
* $FreeBSD: head/lib/libarchive/archive_read_private.h 201088 2009-12-28 02:18:55Z kientzle $
28
#ifndef __LIBARCHIVE_BUILD
29
#error This header is only to be used internally to libarchive.
32
#ifndef ARCHIVE_READ_PRIVATE_H_INCLUDED
33
#define ARCHIVE_READ_PRIVATE_H_INCLUDED
36
#include "archive_string.h"
37
#include "archive_private.h"
40
struct archive_read_filter_bidder;
41
struct archive_read_filter;
44
* How bidding works for filters:
45
* * The bid manager reads the first block from the current source.
46
* * It shows that block to each registered bidder.
47
* * The bid manager creates a new filter structure for the winning
48
* bidder and gives the winning bidder a chance to initialize it.
49
* * The new filter becomes the top filter in the archive_read structure
50
* and we repeat the process.
51
* This ends only when no bidder provides a non-zero bid.
53
struct archive_read_filter_bidder {
54
/* Configuration data for the bidder. */
56
/* Taste the upstream filter to see if we handle this. */
57
int (*bid)(struct archive_read_filter_bidder *,
58
struct archive_read_filter *);
59
/* Initialize a newly-created filter. */
60
int (*init)(struct archive_read_filter *);
61
/* Set an option for the filter bidder. */
62
int (*options)(struct archive_read_filter_bidder *,
63
const char *key, const char *value);
64
/* Release the bidder's configuration data. */
65
int (*free)(struct archive_read_filter_bidder *);
69
* This structure is allocated within the archive_read core
70
* and initialized by archive_read and the init() method of the
71
* corresponding bidder above.
73
struct archive_read_filter {
74
/* Essentially all filters will need these values, so
75
* just declare them here. */
76
struct archive_read_filter_bidder *bidder; /* My bidder. */
77
struct archive_read_filter *upstream; /* Who I read from. */
78
struct archive_read *archive; /* Associated archive. */
79
/* Return next block. */
80
ssize_t (*read)(struct archive_read_filter *, const void **);
81
/* Skip forward this many bytes. */
82
int64_t (*skip)(struct archive_read_filter *self, int64_t request);
83
/* Close (just this filter) and free(self). */
84
int (*close)(struct archive_read_filter *self);
85
/* My private data. */
91
/* Used by reblocking logic. */
94
char *next; /* Current read location. */
95
size_t avail; /* Bytes in my buffer. */
96
const void *client_buff; /* Client buffer information. */
98
const char *client_next;
106
* The client looks a lot like a filter, so we just wrap it here.
108
* TODO: Make archive_read_filter and archive_read_client identical so
109
* that users of the library can easily register their own
110
* transformation filters. This will probably break the API/ABI and
111
* so should be deferred at least until libarchive 3.0.
113
struct archive_read_client {
114
archive_read_callback *reader;
115
archive_skip_callback *skipper;
116
archive_close_callback *closer;
119
struct archive_read {
120
struct archive archive;
122
struct archive_entry *entry;
124
/* Dev/ino of the archive being read/written. */
129
* Used by archive_read_data() to track blocks and copy
130
* data to client buffers, filling gaps with zero bytes.
132
const char *read_data_block;
133
off_t read_data_offset;
134
off_t read_data_output_offset;
135
size_t read_data_remaining;
137
/* Callbacks to open/read/write/close client archive stream. */
138
struct archive_read_client client;
140
/* Registered filter bidders. */
141
struct archive_read_filter_bidder bidders[8];
143
/* Last filter in chain */
144
struct archive_read_filter *filter;
146
/* File offset of beginning of most recently-read header. */
147
off_t header_position;
150
* Format detection is mostly the same as compression
151
* detection, with one significant difference: The bidders
152
* use the read_ahead calls above to examine the stream rather
153
* than having the supervisor hand them a block of data to
157
struct archive_format_descriptor {
160
int (*bid)(struct archive_read *);
161
int (*options)(struct archive_read *, const char *key,
163
int (*read_header)(struct archive_read *, struct archive_entry *);
164
int (*read_data)(struct archive_read *, const void **, size_t *, off_t *);
165
int (*read_data_skip)(struct archive_read *);
166
int (*cleanup)(struct archive_read *);
168
struct archive_format_descriptor *format; /* Active format. */
171
* Various information needed by archive_extract.
173
struct extract *extract;
174
int (*cleanup_archive_extract)(struct archive_read *);
177
int __archive_read_register_format(struct archive_read *a,
180
int (*bid)(struct archive_read *),
181
int (*options)(struct archive_read *, const char *, const char *),
182
int (*read_header)(struct archive_read *, struct archive_entry *),
183
int (*read_data)(struct archive_read *, const void **, size_t *, off_t *),
184
int (*read_data_skip)(struct archive_read *),
185
int (*cleanup)(struct archive_read *));
187
struct archive_read_filter_bidder
188
*__archive_read_get_bidder(struct archive_read *a);
190
const void *__archive_read_ahead(struct archive_read *, size_t, ssize_t *);
191
const void *__archive_read_filter_ahead(struct archive_read_filter *,
193
ssize_t __archive_read_consume(struct archive_read *, size_t);
194
ssize_t __archive_read_filter_consume(struct archive_read_filter *, size_t);
195
int64_t __archive_read_skip(struct archive_read *, int64_t);
196
int64_t __archive_read_skip_lenient(struct archive_read *, int64_t);
197
int64_t __archive_read_filter_skip(struct archive_read_filter *, int64_t);
198
int __archive_read_program(struct archive_read_filter *, const char *);