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.
28 #ifndef __LIBARCHIVE_BUILD
29 #ifndef __LIBARCHIVE_TEST
30 #error This header is only to be used internally to libarchive.
34 #ifndef ARCHIVE_READ_PRIVATE_H_INCLUDED
35 #define ARCHIVE_READ_PRIVATE_H_INCLUDED
38 #include "archive_string.h"
39 #include "archive_private.h"
42 struct archive_read_filter_bidder;
43 struct archive_read_filter;
46 * How bidding works for filters:
47 * * The bid manager initializes the client-provided reader as the
49 * * It invokes the bidder for each registered filter with the
50 * current head filter.
51 * * The bidders can use archive_read_filter_ahead() to peek ahead
52 * at the incoming data to compose their bids.
53 * * The bid manager creates a new filter structure for the winning
54 * bidder and gives the winning bidder a chance to initialize it.
55 * * The new filter becomes the new top filter and we repeat the
57 * This ends only when no bidder provides a non-zero bid. Then
58 * we perform a similar dance with the registered format handlers.
60 struct archive_read_filter_bidder {
61 /* Configuration data for the bidder. */
63 /* Name of the filter */
65 /* Taste the upstream filter to see if we handle this. */
66 int (*bid)(struct archive_read_filter_bidder *,
67 struct archive_read_filter *);
68 /* Initialize a newly-created filter. */
69 int (*init)(struct archive_read_filter *);
70 /* Set an option for the filter bidder. */
71 int (*options)(struct archive_read_filter_bidder *,
72 const char *key, const char *value);
73 /* Release the bidder's configuration data. */
74 int (*free)(struct archive_read_filter_bidder *);
78 * This structure is allocated within the archive_read core
79 * and initialized by archive_read and the init() method of the
80 * corresponding bidder above.
82 struct archive_read_filter {
84 /* Essentially all filters will need these values, so
85 * just declare them here. */
86 struct archive_read_filter_bidder *bidder; /* My bidder. */
87 struct archive_read_filter *upstream; /* Who I read from. */
88 struct archive_read *archive; /* Associated archive. */
89 /* Open a block for reading */
90 int (*open)(struct archive_read_filter *self);
91 /* Return next block. */
92 ssize_t (*read)(struct archive_read_filter *, const void **);
93 /* Skip forward this many bytes. */
94 int64_t (*skip)(struct archive_read_filter *self, int64_t request);
95 /* Seek to an absolute location. */
96 int64_t (*seek)(struct archive_read_filter *self, int64_t offset, int whence);
97 /* Close (just this filter) and free(self). */
98 int (*close)(struct archive_read_filter *self);
99 /* Function that handles switching from reading one block to the next/prev */
100 int (*sswitch)(struct archive_read_filter *self, unsigned int iindex);
101 /* My private data. */
107 /* Used by reblocking logic. */
110 char *next; /* Current read location. */
111 size_t avail; /* Bytes in my buffer. */
112 const void *client_buff; /* Client buffer information. */
114 const char *client_next;
122 * The client looks a lot like a filter, so we just wrap it here.
124 * TODO: Make archive_read_filter and archive_read_client identical so
125 * that users of the library can easily register their own
126 * transformation filters. This will probably break the API/ABI and
127 * so should be deferred at least until libarchive 3.0.
129 struct archive_read_data_node {
130 int64_t begin_position;
134 struct archive_read_client {
135 archive_open_callback *opener;
136 archive_read_callback *reader;
137 archive_skip_callback *skipper;
138 archive_seek_callback *seeker;
139 archive_close_callback *closer;
140 archive_switch_callback *switcher;
144 struct archive_read_data_node *dataset;
146 struct archive_read_passphrase {
148 struct archive_read_passphrase *next;
151 struct archive_read_extract {
152 struct archive *ad; /* archive_write_disk object */
154 /* Progress function invoked during extract. */
155 void (*extract_progress)(void *);
156 void *extract_progress_user_data;
159 struct archive_read {
160 struct archive archive;
162 struct archive_entry *entry;
164 /* Dev/ino of the archive being read/written. */
166 int64_t skip_file_dev;
167 int64_t skip_file_ino;
169 /* Callbacks to open/read/write/close client archive streams. */
170 struct archive_read_client client;
172 /* Registered filter bidders. */
173 struct archive_read_filter_bidder bidders[16];
175 /* Last filter in chain */
176 struct archive_read_filter *filter;
178 /* Whether to bypass filter bidding process */
179 int bypass_filter_bidding;
181 /* File offset of beginning of most recently-read header. */
182 int64_t header_position;
184 /* Nodes and offsets of compressed data block */
185 unsigned int data_start_node;
186 unsigned int data_end_node;
189 * Format detection is mostly the same as compression
190 * detection, with one significant difference: The bidders
191 * use the read_ahead calls above to examine the stream rather
192 * than having the supervisor hand them a block of data to
196 struct archive_format_descriptor {
199 int (*bid)(struct archive_read *, int best_bid);
200 int (*options)(struct archive_read *, const char *key,
202 int (*read_header)(struct archive_read *, struct archive_entry *);
203 int (*read_data)(struct archive_read *, const void **, size_t *, int64_t *);
204 int (*read_data_skip)(struct archive_read *);
205 int64_t (*seek_data)(struct archive_read *, int64_t, int);
206 int (*cleanup)(struct archive_read *);
207 int (*format_capabilties)(struct archive_read *);
208 int (*has_encrypted_entries)(struct archive_read *);
210 struct archive_format_descriptor *format; /* Active format. */
213 * Various information needed by archive_extract.
215 struct archive_read_extract *extract;
216 int (*cleanup_archive_extract)(struct archive_read *);
219 * Decryption passphrase.
222 struct archive_read_passphrase *first;
223 struct archive_read_passphrase **last;
225 archive_passphrase_callback *callback;
230 int __archive_read_register_format(struct archive_read *a,
233 int (*bid)(struct archive_read *, int),
234 int (*options)(struct archive_read *, const char *, const char *),
235 int (*read_header)(struct archive_read *, struct archive_entry *),
236 int (*read_data)(struct archive_read *, const void **, size_t *, int64_t *),
237 int (*read_data_skip)(struct archive_read *),
238 int64_t (*seek_data)(struct archive_read *, int64_t, int),
239 int (*cleanup)(struct archive_read *),
240 int (*format_capabilities)(struct archive_read *),
241 int (*has_encrypted_entries)(struct archive_read *));
243 int __archive_read_get_bidder(struct archive_read *a,
244 struct archive_read_filter_bidder **bidder);
246 const void *__archive_read_ahead(struct archive_read *, size_t, ssize_t *);
247 const void *__archive_read_filter_ahead(struct archive_read_filter *,
249 int64_t __archive_read_seek(struct archive_read*, int64_t, int);
250 int64_t __archive_read_filter_seek(struct archive_read_filter *, int64_t, int);
251 int64_t __archive_read_consume(struct archive_read *, int64_t);
252 int64_t __archive_read_filter_consume(struct archive_read_filter *, int64_t);
253 int __archive_read_program(struct archive_read_filter *, const char *);
254 void __archive_read_free_filters(struct archive_read *);
255 struct archive_read_extract *__archive_read_get_extract(struct archive_read *);
259 * Get a decryption passphrase.
261 void __archive_read_reset_passphrase(struct archive_read *a);
262 const char * __archive_read_next_passphrase(struct archive_read *a);