2710e4d1ef
What it is:
A library for reading and writing various streaming archive
formats, especially tar and cpio. Being a library, it should
be easy to incorporate into pkg_* tools, sysinstall, and any
other place that needs to read or write such archives.
Features:
* Full automatic detection of both compression and archive format.
* Extensible internal architecture to make it easy to add new formats.
* Support for "pax interchange format," a new POSIX-standard tar format
that eliminates essentially all of the restrictions of historic formats.
* BSD license
Thanks to: jkh for pushing me to start this work, gordon for
encouraging me to commit it, bde for answering endless style
questions, and many others for feedback and encouragement.
Status: Pretty good overall, though there are still a few rough edges and
the library could always use more testing. Feedback eagerly solicited.
65 lines
2.2 KiB
C
65 lines
2.2 KiB
C
/*-
|
|
* Copyright (c) 2003-2004 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
|
|
* in this position and unchanged.
|
|
* 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#ifdef DMALLOC
|
|
#include <dmalloc.h>
|
|
#endif
|
|
#include <unistd.h>
|
|
|
|
#include "archive.h"
|
|
#include "archive_private.h"
|
|
|
|
/*
|
|
* This implementation minimizes copying of data.
|
|
*/
|
|
ssize_t
|
|
archive_read_data_into_fd(struct archive *a, int fd)
|
|
{
|
|
ssize_t bytes_read, bytes_written, total_written;
|
|
const void *buff;
|
|
|
|
total_written = 0;
|
|
while (a->entry_bytes_remaining > 0) {
|
|
bytes_read = (a->compression_read_ahead)(a, &buff,
|
|
a->entry_bytes_remaining);
|
|
if (bytes_read < 0)
|
|
return (-1);
|
|
if ((size_t)bytes_read > a->entry_bytes_remaining)
|
|
bytes_read = (ssize_t)a->entry_bytes_remaining;
|
|
|
|
bytes_written = write(fd, buff, bytes_read);
|
|
if (bytes_written < 0)
|
|
return (-1);
|
|
(a->compression_read_consume)(a, bytes_written);
|
|
total_written += bytes_written;
|
|
a->entry_bytes_remaining -= bytes_written;
|
|
}
|
|
return (total_written);
|
|
}
|