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ARCHIVE_READ_EXTRACT(3) BSD Library Functions Manual ARCHIVE_READ_EXTRACT(3)
NAME
archive_read_extract, archive_read_extract2,
archive_read_extract_set_progress_callback — functions for reading
streaming archives
LIBRARY
Streaming Archive Library (libarchive, -larchive)
SYNOPSIS
#include <archive.h>
int
archive_read_extract(struct archive *, struct archive_entry *,
int flags);
int
archive_read_extract2(struct archive *src, struct archive_entry *,
struct archive *dest);
void
archive_read_extract_set_progress_callback(struct archive *,
void (*func)(void *), void *user_data);
DESCRIPTION
archive_read_extract(), archive_read_extract_set_skip_file()
A convenience function that wraps the corresponding
archive_write_disk(3) interfaces. The first call to
archive_read_extract() creates a restore object using
archive_write_disk_new(3) and
archive_write_disk_set_standard_lookup(3), then transparently in‐
vokes archive_write_disk_set_options(3), archive_write_header(3),
archive_write_data(3), and archive_write_finish_entry(3) to cre‐
ate the entry on disk and copy data into it. The flags argument
is passed unmodified to archive_write_disk_set_options(3).
archive_read_extract2()
This is another version of archive_read_extract() that allows you
to provide your own restore object. In particular, this allows
you to override the standard lookup functions using
archive_write_disk_set_group_lookup(3), and
archive_write_disk_set_user_lookup(3). Note that
archive_read_extract2() does not accept a flags argument; you
should use archive_write_disk_set_options() to set the restore
options yourself.
archive_read_extract_set_progress_callback()
Sets a pointer to a user-defined callback that can be used for
updating progress displays during extraction. The progress func‐
tion will be invoked during the extraction of large regular
files. The progress function will be invoked with the pointer
provided to this call. Generally, the data pointed to should in‐
clude a reference to the archive object and the archive_entry ob‐
ject so that various statistics can be retrieved for the progress
display.
RETURN VALUES
Most functions return zero on success, non-zero on error. The possible
return codes include: ARCHIVE_OK (the operation succeeded), ARCHIVE_WARN
(the operation succeeded but a non-critical error was encountered),
ARCHIVE_EOF (end-of-archive was encountered), ARCHIVE_RETRY (the opera‐
tion failed but can be retried), and ARCHIVE_FATAL (there was a fatal er‐
ror; the archive should be closed immediately).
ERRORS
Detailed error codes and textual descriptions are available from the
archive_errno() and archive_error_string() functions.
SEE ALSO
tar(1), libarchive(3), archive_read(3), archive_read_data(3),
archive_read_filter(3), archive_read_format(3), archive_read_open(3),
archive_read_set_options(3), archive_util(3), tar(5)
BSD February 2, 2012 BSD
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