1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
/*-
* Copyright (c) 2003-2007 Tim Kientzle
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef ARCHIVE_WRITE_PRIVATE_H_INCLUDED
#define ARCHIVE_WRITE_PRIVATE_H_INCLUDED
#include "archive.h"
#include "archive_string.h"
#include "archive_private.h"
struct archive_write {
struct archive archive;
struct archive_entry *entry;
/* Dev/ino of the archive being read/written. */
dev_t skip_file_dev;
ino_t skip_file_ino;
/* Utility: Pointer to a block of nulls. */
const unsigned char *nulls;
size_t null_length;
/*
* Used by archive_read_data() to track blocks and copy
* data to client buffers, filling gaps with zero bytes.
*/
const char *read_data_block;
off_t read_data_offset;
off_t read_data_output_offset;
size_t read_data_remaining;
/* Callbacks to open/read/write/close archive stream. */
archive_open_callback *client_opener;
archive_read_callback *client_reader;
archive_skip_callback *client_skipper;
archive_write_callback *client_writer;
archive_close_callback *client_closer;
void *client_data;
/*
* Blocking information. Note that bytes_in_last_block is
* misleadingly named; I should find a better name. These
* control the final output from all compressors, including
* compression_none.
*/
int bytes_per_block;
int bytes_in_last_block;
/*
* These control whether data within a gzip/bzip2 compressed
* stream gets padded or not. If pad_uncompressed is set,
* the data will be padded to a full block before being
* compressed. The pad_uncompressed_byte determines the value
* that will be used for padding. Note that these have no
* effect on compression "none."
*/
int pad_uncompressed;
int pad_uncompressed_byte; /* TODO: Support this. */
/*
* On write, the client just invokes an archive_write_set function
* which sets up the data here directly.
*/
void *compression_data; /* Data for (de)compressor. */
int (*compression_init)(struct archive_write *); /* Initialize. */
int (*compression_finish)(struct archive_write *);
int (*compression_write)(struct archive_write *, const void *, size_t);
/*
* Read uses a peek/consume I/O model: the decompression code
* returns a pointer to the requested block and advances the
* file position only when requested by a consume call. This
* reduces copying and also simplifies look-ahead for format
* detection.
*/
ssize_t (*compression_read_ahead)(struct archive *,
const void **, size_t request);
ssize_t (*compression_read_consume)(struct archive *, size_t);
off_t (*compression_skip)(struct archive *, off_t);
/*
* Format detection is mostly the same as compression
* detection, with two significant differences: The bidders
* use the read_ahead calls above to examine the stream rather
* than having the supervisor hand them a block of data to
* examine, and the auction is repeated for every header.
* Winning bidders should set the archive_format and
* archive_format_name appropriately. Bid routines should
* check archive_format and decline to bid if the format of
* the last header was incompatible.
*
* Again, write support is considerably simpler because there's
* no need for an auction.
*/
int archive_format;
const char *archive_format_name;
struct archive_format_descriptor {
int (*bid)(struct archive *);
int (*read_header)(struct archive *, struct archive_entry *);
int (*read_data)(struct archive *, const void **, size_t *, off_t *);
int (*read_data_skip)(struct archive *);
int (*cleanup)(struct archive *);
void *format_data; /* Format-specific data for readers. */
} formats[8];
struct archive_format_descriptor *format; /* Active format. */
/*
* Storage for format-specific data. Note that there can be
* multiple format readers active at one time, so we need to
* allow for multiple format readers to have their data
* available. The pformat_data slot here is the solution: on
* read, it is guaranteed to always point to a void* variable
* that the format can use.
*/
void **pformat_data; /* Pointer to current format_data. */
void *format_data; /* Used by writers. */
/*
* Pointers to format-specific functions for writing. They're
* initialized by archive_write_set_format_XXX() calls.
*/
int (*format_init)(struct archive_write *);
int (*format_finish)(struct archive_write *);
int (*format_destroy)(struct archive_write *);
int (*format_finish_entry)(struct archive_write *);
int (*format_write_header)(struct archive_write *,
struct archive_entry *);
ssize_t (*format_write_data)(struct archive_write *,
const void *buff, size_t);
/*
* Various information needed by archive_extract.
*/
struct extract *extract;
int (*cleanup_archive_extract)(struct archive *);
};
/*
* Utility function to format a USTAR header into a buffer. If
* "strict" is set, this tries to create the absolutely most portable
* version of a ustar header. If "strict" is set to 0, then it will
* relax certain requirements.
*
* Generally, format-specific declarations don't belong in this
* header; this is a rare example of a function that is shared by
* two very similar formats (ustar and pax).
*/
int
__archive_write_format_header_ustar(struct archive_write *, char buff[512],
struct archive_entry *, int tartype, int strict);
#endif
|
