contrib/libarchive/archive_read_open_fd.c

   1 /*-
   2  * Copyright (c) 2003-2004 Tim Kientzle
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer
  10  *    in this position and unchanged.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include "archive_platform.h"
  28 __FBSDID("$FreeBSD: src/lib/libarchive/archive_read_open_fd.c,v 1.3 2004/06/27 23:36:39 kientzle Exp $");
  29
  30 #include <sys/stat.h>
  31 #include <errno.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include <unistd.h>
  35
  36 #include "archive.h"
  37 #include "archive_private.h"
  38
  39 struct read_fd_data {
  40         int      fd;
  41         size_t   block_size;
  42         void    *buffer;
  43 };
  44
  45 static int      file_close(struct archive *, void *);
  46 static int      file_open(struct archive *, void *);
  47 static ssize_t  file_read(struct archive *, void *, const void **buff);
  48
  49 int
  50 archive_read_open_fd(struct archive *a, int fd, size_t block_size)
  51 {
  52         struct read_fd_data *mine;
  53
  54         mine = malloc(sizeof(*mine));
  55         if (mine == NULL) {
  56                 archive_set_error(a, ENOMEM, "No memory");
  57                 return (ARCHIVE_FATAL);
  58         }
  59         mine->block_size = block_size;
  60         mine->buffer = malloc(mine->block_size);
  61         mine->fd = fd;
  62         return (archive_read_open(a, mine, file_open, file_read, file_close));
  63 }
  64
  65 static int
  66 file_open(struct archive *a, void *client_data)
  67 {
  68         struct read_fd_data *mine = client_data;
  69         struct stat st;
  70
  71         if (fstat(mine->fd, &st) != 0) {
  72                 archive_set_error(a, errno, "Can't stat fd %d", mine->fd);
  73                 return (ARCHIVE_FATAL);
  74         }
  75
  76         a->skip_file_dev = st.st_dev;
  77         a->skip_file_ino = st.st_ino;
  78         return (ARCHIVE_OK);
  79 }
  80
  81 static ssize_t
  82 file_read(struct archive *a, void *client_data, const void **buff)
  83 {
  84         struct read_fd_data *mine = client_data;
  85
  86         (void)a; /* UNUSED */
  87         *buff = mine->buffer;
  88         return (read(mine->fd, mine->buffer, mine->block_size));
  89 }
  90
  91 static int
  92 file_close(struct archive *a, void *client_data)
  93 {
  94         struct read_fd_data *mine = client_data;
  95
  96         (void)a; /* UNUSED */
  97         free(mine);
  98         return (ARCHIVE_OK);
  99 }