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.
110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/*-
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* Copyright (c) 2003-2004 Tim Kientzle
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#ifdef DMALLOC
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#include <dmalloc.h>
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#endif
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "archive.h"
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struct read_file_data {
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int fd;
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size_t block_size;
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void *buffer;
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char filename[1];
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};
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static int file_close(struct archive *, void *);
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static int file_open(struct archive *, void *);
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static ssize_t file_read(struct archive *, void *, const void **buff);
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int
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archive_read_open_file(struct archive *a, const char *filename,
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size_t block_size)
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{
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struct read_file_data *mine;
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/* XXX detect and report malloc failure XXX */
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if (filename == NULL) {
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mine = malloc(sizeof(*mine));
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mine->filename[0] = 0;
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} else {
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mine = malloc(sizeof(*mine) + strlen(filename));
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strcpy(mine->filename, filename);
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}
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mine->block_size = block_size;
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mine->buffer = malloc(mine->block_size);
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mine->fd = -1;
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return (archive_read_open(a, mine, file_open, file_read, file_close));
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}
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static int
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file_open(struct archive *a, void *client_data)
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{
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struct read_file_data *mine = client_data;
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if (*mine->filename != 0)
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mine->fd = open(mine->filename, O_RDONLY);
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else
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mine->fd = 0;
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if (mine->fd < 0) {
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archive_set_error(a, errno, "Failed to open '%s'",
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mine->filename);
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return (ARCHIVE_FATAL);
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}
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return (0);
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}
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static ssize_t
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file_read(struct archive *a, void *client_data, const void **buff)
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{
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struct read_file_data *mine = client_data;
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(void)a; /* UNUSED */
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*buff = mine->buffer;
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return (read(mine->fd, mine->buffer, mine->block_size));
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}
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static int
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file_close(struct archive *a, void *client_data)
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{
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struct read_file_data *mine = client_data;
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(void)a; /* UNUSED */
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if (mine->fd >= 0)
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close(mine->fd);
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free(mine);
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return (ARCHIVE_OK);
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}
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