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

NAME
     libarchive_changes — changes in libarchive interface

CHANGES IN LIBARCHIVE 3
     This page describes user-visible changes in libarchive3, and lists public
     functions and other symbols changed, deprecated or removed in
     libarchive3, along with their replacements if any.

   Multiple Filters
     Libarchive2 permitted a single (input or output) filter active on an ar‐
     chive.  Libarchive3 extends this into a variable-length stack.  Where
     archive_write_set_compression_XXX() would replace any existing filter,
     archive_write_add_filter_XXX() extends the write pipeline with another
     filter.

   Character Set Handling
     Libarchive2 assumed that the local platform uses Unicode as the native
     wchar_t encoding, which is true on Windows, modern Linux, and a few other
     systems, but is certainly not universal.  As a result, pax format ar‐
     chives were written incorrectly on some systems, since pax format re‐
     quires UTF-8 and libarchive 2 incorrectly assumed that wchar_t strings
     can be easily converted to UTF-8.

     Libarchive3 uses the standard iconv library to convert between character
     sets and is introducing the notion of a “default character set for the
     archive”.	To support this, archive_entry objects can now be bound to a
     particular archive when they are created.	The automatic character set
     conversions performed by archive_entry objects when reading and writing
     filenames, usernames, and other strings will now use an appropriate de‐
     fault character set:

     If the archive_entry object is bound to an archive, it will use the de‐
     fault character set for that archive.

     The platform default character encoding (as returned by
     nl_langinfo(CHARSET)) will be used if nothing else is specified.

     Libarchive3 also introduces charset options to many of the archive read‐
     ers and writers to control the character set that will be used for file‐
     names written in those archives.  When possible, this will be set auto‐
     matically based on information in the archive itself.  Combining this
     with the notion of a default character set for the archive should allow
     you to configure libarchive to read archives from other platforms and
     have the filenames and other information transparently converted to the
     character encoding suitable for your application.

   Prototype Changes
     These changes break binary compatibility; libarchive3 has a new shared
     library version to reflect these changes.	The library now uses portable
     wide types such as int64_t instead of less-portable types such as off_t,
     gid_t, uid_t, and ino_t.

     There are a few cases where these changes will affect your source code:

     •	  In some cases, libarchive's wider types will introduce the possibil‐
	  ity of truncation: for example, on a system with a 16-bit uid_t, you
	  risk having uid 65536 be truncated to uid 0, which can cause serious
	  security problems.

     •	  Typedef function pointer types will be incompatible.	For example,
	  if you define custom skip callbacks, you may have to use code simi‐
	  lar to the following if you want to support building against
	  libarchive2 and libarchive3:

	  #if ARCHIVE_VERSION_NUMBER < 3000000
	  typedef off_t myoff_t;
	  #else
	  typedef int64_t myoff_t;
	  #endif

	  myoff_t
	  my_skip_function(struct archive *a, void *v, myoff_t o)
	  {
	      ... implementation ...
	  }

     Affected functions:

     •	 archive_entry_gid(), archive_entry_set_gid()
     •	 archive_entry_uid(), archive_entry_set_uid()
     •	 archive_entry_ino(), archive_entry_set_ino()
     •	 archive_read_data_block(), archive_write_data_block()
     •	 archive_read_disk_gname(), archive_read_disk_uname()
     •	 archive_read_disk_set_gname_lookup(),
	 archive_read_disk_set_group_lookup(),
	 archive_read_disk_set_uname_lookup(),
	 archive_read_disk_set_user_lookup()
     •	 archive_skip_callback()
     •	 archive_read_extract_set_skip_file(),
	 archive_write_disk_set_skip_file(), archive_write_set_skip_file()
     •	 archive_write_disk_set_group_lookup(),
	 archive_write_disk_set_user_lookup()

     Where these functions or their arguments took or returned gid_t, ino_t,
     off_t, or uid_t they now take or return int64_t or equivalent.

   Deprecated Symbols
     Symbols deprecated in libarchive3 will be removed in libarchive4.	These
     symbols, along with their replacements if any, are listed below:

     archive_position_compressed(), archive_position_uncompressed()
	  archive_filter_bytes()

     archive_compression()
	  archive_filter_code()

     archive_compression_name()
	  archive_filter_name()

     archive_read_finish(), archive_write_finish()
	  archive_read_free(), archive_write_free()

     archive_read_open_file(), archive_write_open_file()
	  archive_read_open_filename(), archive_write_open_filename()

     archive_read_support_compression_all()
	  archive_read_support_filter_all()

     archive_read_support_compression_bzip2()
	  archive_read_support_filter_bzip2()

     archive_read_support_compression_compress()
	  archive_read_support_filter_compress()

     archive_read_support_compression_gzip()
	  archive_read_support_filter_gzip()

     archive_read_support_compression_lzip()
	  archive_read_support_filter_lzip()

     archive_read_support_compression_lzma()
	  archive_read_support_filter_lzma()

     archive_read_support_compression_none()
	  archive_read_support_filter_none()

     archive_read_support_compression_program()
	  archive_read_support_filter_program()

     archive_read_support_compression_program_signature()
	  archive_read_support_filter_program_signature()

     archive_read_support_compression_rpm()
	  archive_read_support_filter_rpm()

     archive_read_support_compression_uu()
	  archive_read_support_filter_uu()

     archive_read_support_compression_xz()
	  archive_read_support_filter_xz()

     archive_write_set_compression_bzip2()
	  archive_write_add_filter_bzip2()

     archive_write_set_compression_compress()
	  archive_write_add_filter_compress()

     archive_write_set_compression_gzip()
	  archive_write_add_filter_gzip()

     archive_write_set_compression_lzip()
	  archive_write_add_filter_lzip()

     archive_write_set_compression_lzma()
	  archive_write_add_filter_lzma()

     archive_write_set_compression_none()
	  archive_write_add_filter_none()

     archive_write_set_compression_program()
	  archive_write_add_filter_program()

     archive_write_set_compression_filter()
	  archive_write_add_filter_filter()

   Removed Symbols
     These symbols, listed below along with their replacements if any, were
     deprecated in libarchive2, and are not part of libarchive3.

     archive_api_feature()
	  archive_version_number()

     archive_api_version()
	  archive_version_number()

     archive_version()
	  archive_version_string()

     archive_version_stamp()
	  archive_version_number()

     archive_read_set_filter_options()
	  archive_read_set_options() or archive_read_set_filter_option()

     archive_read_set_format_options()
	  archive_read_set_options() or archive_read_set_format_option()

     archive_write_set_filter_options()
	  archive_write_set_options() or archive_write_set_filter_option()

     archive_write_set_format_options()
	  archive_write_set_options() or archive_write_set_format_option()

     ARCHIVE_API_FEATURE
	  ARCHIVE_VERSION_NUMBER

     ARCHIVE_API_VERSION
	  ARCHIVE_VERSION_NUMBER

     ARCHIVE_VERSION_STAMP
	  ARCHIVE_VERSION_NUMBER

     ARCHIVE_LIBRARY_VERSION
	  ARCHIVE_VERSION_STRING

     ARCHIVE_COMPRESSION_NONE
	  ARCHIVE_FILTER_NONE

     ARCHIVE_COMPRESSION_GZIP
	  ARCHIVE_FILTER_GZIP

     ARCHIVE_COMPRESSION_BZIP2
	  ARCHIVE_FILTER_BZIP2

     ARCHIVE_COMPRESSION_COMPRESS
	  ARCHIVE_FILTER_COMPRESS

     ARCHIVE_COMPRESSION_PROGRAM
	  ARCHIVE_FILTER_PROGRAM

     ARCHIVE_COMPRESSION_LZMA
	  ARCHIVE_FILTER_LZMA

     ARCHIVE_COMPRESSION_XZ
	  ARCHIVE_FILTER_XZ

     ARCHIVE_COMPRESSION_UU
	  ARCHIVE_FILTER_UU

     ARCHIVE_COMPRESSION_RPM
	  ARCHIVE_FILTER_RPM

     ARCHIVE_COMPRESSION_LZIP
	  ARCHIVE_FILTER_LZIP

     ARCHIVE_BYTES_PER_RECORD
	  512

     ARCHIVE_DEFAULT_BYTES_PER_BLOCK
	  10240

SEE ALSO
     archive_read(3), archive_read_filter(3), archive_read_format(3),
     archive_read_set_options(3), archive_util(3), archive_write(3),
     archive_write_filter(3), archive_write_format(3),
     archive_write_set_options(3), libarchive(3)

BSD			       December 23, 2011			   BSD
