freebsd-skq/lib/libarchive/archive_read_open_file.c
Tim Kientzle 2710e4d1ef Initial import of libarchive.
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.
2004-02-09 23:22:54 +00:00

110 lines
3.1 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 <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "archive.h"
struct read_file_data {
int fd;
size_t block_size;
void *buffer;
char filename[1];
};
static int file_close(struct archive *, void *);
static int file_open(struct archive *, void *);
static ssize_t file_read(struct archive *, void *, const void **buff);
int
archive_read_open_file(struct archive *a, const char *filename,
size_t block_size)
{
struct read_file_data *mine;
/* XXX detect and report malloc failure XXX */
if (filename == NULL) {
mine = malloc(sizeof(*mine));
mine->filename[0] = 0;
} else {
mine = malloc(sizeof(*mine) + strlen(filename));
strcpy(mine->filename, filename);
}
mine->block_size = block_size;
mine->buffer = malloc(mine->block_size);
mine->fd = -1;
return (archive_read_open(a, mine, file_open, file_read, file_close));
}
static int
file_open(struct archive *a, void *client_data)
{
struct read_file_data *mine = client_data;
if (*mine->filename != 0)
mine->fd = open(mine->filename, O_RDONLY);
else
mine->fd = 0;
if (mine->fd < 0) {
archive_set_error(a, errno, "Failed to open '%s'",
mine->filename);
return (ARCHIVE_FATAL);
}
return (0);
}
static ssize_t
file_read(struct archive *a, void *client_data, const void **buff)
{
struct read_file_data *mine = client_data;
(void)a; /* UNUSED */
*buff = mine->buffer;
return (read(mine->fd, mine->buffer, mine->block_size));
}
static int
file_close(struct archive *a, void *client_data)
{
struct read_file_data *mine = client_data;
(void)a; /* UNUSED */
if (mine->fd >= 0)
close(mine->fd);
free(mine);
return (ARCHIVE_OK);
}