NAME

     archive_read_data archive_read_data_block, archive_read_data_skip, archive_read_data_into_fd
     — functions for reading streaming archives

LIBRARY

     Streaming Archive Library (libarchive, -larchive)

SYNOPSIS

     #include <archive.h>

     ssize_t
     archive_read_data(struct archive *, void *buff, size_t len);

     int
     archive_read_data_block(struct archive *, const void **buff, size_t *len, off_t *offset);

     int
     archive_read_data_skip(struct archive *);

     int
     archive_read_data_into_fd(struct archive *, int fd);

DESCRIPTION

     archive_read_data()
             Read data associated with the header just read.  Internally, this is a convenience
             function that calls archive_read_data_block() and fills any gaps with nulls so that
             callers see a single continuous stream of data.
     archive_read_data_block()
             Return the next available block of data for this entry.  Unlike archive_read_data(),
             the archive_read_data_block() function avoids copying data and allows you to
             correctly handle sparse files, as supported by some archive formats.  The library
             guarantees that offsets will increase and that blocks will not overlap.  Note that
             the blocks returned from this function can be much larger than the block size read
             from disk, due to compression and internal buffer optimizations.
     archive_read_data_skip()
             A convenience function that repeatedly calls archive_read_data_block() to skip all
             of the data for this archive entry.  Note that this function is invoked
             automatically by archive_read_next_header2() if the previous entry was not
             completely consumed.
     archive_read_data_into_fd()
             A convenience function that repeatedly calls archive_read_data_block() to copy the
             entire entry to the provided file descriptor.

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 operation failed but can be retried), and ARCHIVE_FATAL (there was a
     fatal error; the archive should be closed immediately).

     archive_read_data() returns a count of bytes actually read or zero at the end of the entry.
     On error, a value of ARCHIVE_FATAL, ARCHIVE_WARN, or ARCHIVE_RETRY is returned.

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_extract(3), archive_read_filter(3),
     archive_read_format(3), archive_read_header(3), archive_read_open(3),
     archive_read_set_options(3), archive_util(3), tar(5)