libarchive_changes(3)

1LIBARCHIVE_CHANGES(3)    BSD Library Functions Manual    LIBARCHIVE_CHANGES(3)
2

NAME

4     changes in libarchive interface
5

CHANGES IN LIBARCHIVE 3

7     This page describes user-visible changes in libarchive3, and lists public
8     functions and other symbols changed, deprecated or removed in
9     libarchive3, along with their replacements if any.
10
11   Multiple Filters
12     Libarchive2 permitted a single (input or output) filter active on an ar‐
13     chive.  Libarchive3 extends this into a variable-length stack.  Where
14     archive_write_set_compression_XXX() would replace any existing filter,
15     archive_write_add_filter_XXX() extends the write pipeline with another
16     filter.
17
18   Character Set Handling
19     Libarchive2 assumed that the local platform uses Unicode as the native
20     wchar_t encoding, which is true on Windows, modern Linux, and a few other
21     systems, but is certainly not universal.  As a result, pax format ar‐
22     chives were written incorrectly on some systems, since pax format
23     requires UTF-8 and libarchive 2 incorrectly assumed that wchar_t strings
24     can be easily converted to UTF-8.
25
26     Libarchive3 uses the standard iconv library to convert between character
27     sets and is introducing the notion of a “default character set for the
28     archive”.  To support this, archive_entry objects can now be bound to a
29     particular archive when they are created.  The automatic character set
30     conversions performed by archive_entry objects when reading and writing
31     filenames, usernames, and other strings will now use an appropriate
32     default character set:
33
34     If the archive_entry object is bound to an archive, it will use the
35     default character set for that archive.
36
37     The platform default character encoding (as returned by
38     nl_langinfo(CHARSET)) will be used if nothing else is specified.
39
40     Libarchive3 also introduces charset options to many of the archive read‐
41     ers and writers to control the character set that will be used for file‐
42     names written in those archives.  When possible, this will be set auto‐
43     matically based on information in the archive itself.  Combining this
44     with the notion of a default character set for the archive should allow
45     you to configure libarchive to read archives from other platforms and
46     have the filenames and other information transparently converted to the
47     character encoding suitable for your application.
48
49   Prototype Changes
50     These changes break binary compatibility; libarchive3 has a new shared
51     library version to reflect these changes.  The library now uses portable
52     wide types such as int64_t instead of less-portable types such as off_t,
53     gid_t, uid_t, and ino_t.
54
55     There are a few cases where these changes will affect your source code:
56
57     ·    In some cases, libarchive's wider types will introduce the possibil‐
58          ity of truncation: for example, on a system with a 16-bit uid_t, you
59          risk having uid 65536 be truncated to uid 0, which can cause serious
60          security problems.
61
62     ·    Typedef function pointer types will be incompatible.  For example,
63          if you define custom skip callbacks, you may have to use code simi‐
64          lar to the following if you want to support building against
65          libarchive2 and libarchive3:
66
67          #if ARCHIVE_VERSION_NUMBER < 3000000
68          typedef off_t myoff_t;
69          #else
70          typedef int64_t myoff_t;
71          #endif
72
73          myoff_t
74          my_skip_function(struct archive *a, void *v, myoff_t o)
75          {
76              ... implementation ...
77          }
78
79     Affected functions:
80
81     ·   archive_entry_gid(), archive_entry_set_gid()
82     ·   archive_entry_uid(), archive_entry_set_uid()
83     ·   archive_entry_ino(), archive_entry_set_ino()
84     ·   archive_read_data_block(), archive_write_data_block()
85     ·   archive_read_disk_gname(), archive_read_disk_uname()
86     ·   archive_read_disk_set_gname_lookup(),
87         archive_read_disk_set_group_lookup(),
88         archive_read_disk_set_uname_lookup(),
89         archive_read_disk_set_user_lookup()
90     ·   archive_skip_callback()
91     ·   archive_read_extract_set_skip_file(),
92         archive_write_disk_set_skip_file(), archive_write_set_skip_file()
93     ·   archive_write_disk_set_group_lookup(),
94         archive_write_disk_set_user_lookup()
95
96     Where these functions or their arguments took or returned gid_t, ino_t,
97     off_t, or uid_t they now take or return int64_t or equivalent.
98
99   Deprecated Symbols
100     Symbols deprecated in libarchive3 will be removed in libarchive4.  These
101     symbols, along with their replacements if any, are listed below:
102
103     archive_position_compressed(), archive_position_uncompressed()
104          archive_filter_bytes()
105
106     archive_compression()
107          archive_filter_code()
108
109     archive_compression_name()
110          archive_filter_name()
111
112     archive_read_finish(), archive_write_finish()
113          archive_read_free(), archive_write_free()
114
115     archive_read_open_file(), archive_write_open_file()
116          archive_read_open_filename(), archive_write_open_filename()
117
118     archive_read_support_compression_all()
119          archive_read_support_filter_all()
120
121     archive_read_support_compression_bzip2()
122          archive_read_support_filter_bzip2()
123
124     archive_read_support_compression_compress()
125          archive_read_support_filter_compress()
126
127     archive_read_support_compression_gzip()
128          archive_read_support_filter_gzip()
129
130     archive_read_support_compression_lzip()
131          archive_read_support_filter_lzip()
132
133     archive_read_support_compression_lzma()
134          archive_read_support_filter_lzma()
135
136     archive_read_support_compression_none()
137          archive_read_support_filter_none()
138
139     archive_read_support_compression_program()
140          archive_read_support_filter_program()
141
142     archive_read_support_compression_program_signature()
143          archive_read_support_filter_program_signature()
144
145     archive_read_support_compression_rpm()
146          archive_read_support_filter_rpm()
147
148     archive_read_support_compression_uu()
149          archive_read_support_filter_uu()
150
151     archive_read_support_compression_xz()
152          archive_read_support_filter_xz()
153
154     archive_write_set_compression_bzip2()
155          archive_write_add_filter_bzip2()
156
157     archive_write_set_compression_compress()
158          archive_write_add_filter_compress()
159
160     archive_write_set_compression_gzip()
161          archive_write_add_filter_gzip()
162
163     archive_write_set_compression_lzip()
164          archive_write_add_filter_lzip()
165
166     archive_write_set_compression_lzma()
167          archive_write_add_filter_lzma()
168
169     archive_write_set_compression_none()
170          archive_write_add_filter_none()
171
172     archive_write_set_compression_program()
173          archive_write_add_filter_program()
174
175     archive_write_set_compression_filter()
176          archive_write_add_filter_filter()
177
178   Removed Symbols
179     These symbols, listed below along with their replacements if any, were
180     deprecated in libarchive2, and are not part of libarchive3.
181
182     archive_api_feature()
183          archive_version_number()
184
185     archive_api_version()
186          archive_version_number()
187
188     archive_version()
189          archive_version_string()
190
191     archive_version_stamp()
192          archive_version_number()
193
194     archive_read_set_filter_options()
195          archive_read_set_options() or archive_read_set_filter_option()
196
197     archive_read_set_format_options()
198          archive_read_set_options() or archive_read_set_format_option()
199
200     archive_write_set_filter_options()
201          archive_write_set_options() or archive_write_set_filter_option()
202
203     archive_write_set_format_options()
204          archive_write_set_options() or archive_write_set_format_option()
205
206     ARCHIVE_API_FEATURE
207          ARCHIVE_VERSION_NUMBER
208
209     ARCHIVE_API_VERSION
210          ARCHIVE_VERSION_NUMBER
211
212     ARCHIVE_VERSION_STAMP
213          ARCHIVE_VERSION_NUMBER
214
215     ARCHIVE_LIBRARY_VERSION
216          ARCHIVE_VERSION_STRING
217
218     ARCHIVE_COMPRESSION_NONE
219          ARCHIVE_FILTER_NONE
220
221     ARCHIVE_COMPRESSION_GZIP
222          ARCHIVE_FILTER_GZIP
223
224     ARCHIVE_COMPRESSION_BZIP2
225          ARCHIVE_FILTER_BZIP2
226
227     ARCHIVE_COMPRESSION_COMPRESS
228          ARCHIVE_FILTER_COMPRESS
229
230     ARCHIVE_COMPRESSION_PROGRAM
231          ARCHIVE_FILTER_PROGRAM
232
233     ARCHIVE_COMPRESSION_LZMA
234          ARCHIVE_FILTER_LZMA
235
236     ARCHIVE_COMPRESSION_XZ
237          ARCHIVE_FILTER_XZ
238
239     ARCHIVE_COMPRESSION_UU
240          ARCHIVE_FILTER_UU
241
242     ARCHIVE_COMPRESSION_RPM
243          ARCHIVE_FILTER_RPM
244
245     ARCHIVE_COMPRESSION_LZIP
246          ARCHIVE_FILTER_LZIP
247
248     ARCHIVE_BYTES_PER_RECORD
249          512
250
251     ARCHIVE_DEFAULT_BYTES_PER_BLOCK
252          10240
253

NAME

CHANGES IN LIBARCHIVE 3

SEE ALSO