contrib/libarchive-2.0/libarchive/archive_read_open_file.c

   1 /*-
   2  * Copyright (c) 2003-2007 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  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "archive_platform.h"
  27 __FBSDID("$FreeBSD: src/lib/libarchive/archive_read_open_file.c,v 1.19 2007/01/09 08:05:55 kientzle Exp $");
  28
  29 #ifdef HAVE_SYS_STAT_H
  30 #include <sys/stat.h>
  31 #endif
  32 #ifdef HAVE_ERRNO_H
  33 #include <errno.h>
  34 #endif
  35 #ifdef HAVE_FCNTL_H
  36 #include <fcntl.h>
  37 #endif
  38 #ifdef HAVE_STDLIB_H
  39 #include <stdlib.h>
  40 #endif
  41 #ifdef HAVE_STRING_H
  42 #include <string.h>
  43 #endif
  44 #ifdef HAVE_UNISTD_H
  45 #include <unistd.h>
  46 #endif
  47
  48 #include "archive.h"
  49
  50 struct read_FILE_data {
  51         FILE    *f;
  52         size_t   block_size;
  53         void    *buffer;
  54 };
  55
  56 static int      file_close(struct archive *, void *);
  57 static int      file_open(struct archive *, void *);
  58 static ssize_t  file_read(struct archive *, void *, const void **buff);
  59 #if ARCHIVE_API_VERSION < 2
  60 static ssize_t  file_skip(struct archive *, void *, size_t request);
  61 #else
  62 static off_t    file_skip(struct archive *, void *, off_t request);
  63 #endif
  64
  65 int
  66 archive_read_open_FILE(struct archive *a, FILE *f)
  67 {
  68         struct read_FILE_data *mine;
  69
  70         mine = (struct read_FILE_data *)malloc(sizeof(*mine));
  71         if (mine == NULL) {
  72                 archive_set_error(a, ENOMEM, "No memory");
  73                 return (ARCHIVE_FATAL);
  74         }
  75         mine->block_size = 128 * 1024;
  76         mine->buffer = malloc(mine->block_size);
  77         if (mine->buffer == NULL) {
  78                 archive_set_error(a, ENOMEM, "No memory");
  79                 free(mine);
  80                 return (ARCHIVE_FATAL);
  81         }
  82         mine->f = f;
  83         return (archive_read_open2(a, mine, file_open, file_read,
  84                     file_skip, file_close));
  85 }
  86
  87 static int
  88 file_open(struct archive *a, void *client_data)
  89 {
  90         struct read_FILE_data *mine = (struct read_FILE_data *)client_data;
  91         struct stat st;
  92
  93         /*
  94          * If we can't fstat() the file, it may just be that
  95          * it's not a file.  (FILE * objects can wrap many kinds
  96          * of I/O streams.)
  97          */
  98         if (fstat(fileno(mine->f), &st) == 0 && S_ISREG(st.st_mode))
  99                 archive_read_extract_set_skip_file(a, st.st_dev, st.st_ino);
 100
 101         return (ARCHIVE_OK);
 102 }
 103
 104 static ssize_t
 105 file_read(struct archive *a, void *client_data, const void **buff)
 106 {
 107         struct read_FILE_data *mine = (struct read_FILE_data *)client_data;
 108         ssize_t bytes_read;
 109
 110         *buff = mine->buffer;
 111         bytes_read = fread(mine->buffer, 1, mine->block_size, mine->f);
 112         if (bytes_read < 0) {
 113                 archive_set_error(a, errno, "Error reading file");
 114         }
 115         return (bytes_read);
 116 }
 117
 118 #if ARCHIVE_API_VERSION < 2
 119 static ssize_t
 120 file_skip(struct archive *a, void *client_data, size_t request)
 121 #else
 122 static off_t
 123 file_skip(struct archive *a, void *client_data, off_t request)
 124 #endif
 125 {
 126         struct read_FILE_data *mine = (struct read_FILE_data *)client_data;
 127
 128         /*
 129          * Note: the 'fd' and 'filename' versions round the request
 130          * down to a multiple of the block size to ensure proper
 131          * operation on block-oriented media such as tapes.  But stdio
 132          * doesn't work with such media (it doesn't ensure blocking),
 133          * so we don't need to bother.
 134          */
 135 #if HAVE_FSEEKO
 136         if (fseeko(mine->f, request, SEEK_CUR) != 0)
 137 #else
 138         if (fseek(mine->f, request, SEEK_CUR) != 0)
 139 #endif
 140         {
 141                 archive_set_error(a, errno, "Error skipping forward");
 142                 return (ARCHIVE_FATAL);
 143         }
 144         return (request);
 145 }
 146
 147 static int
 148 file_close(struct archive *a, void *client_data)
 149 {
 150         struct read_FILE_data *mine = (struct read_FILE_data *)client_data;
 151
 152         (void)a; /* UNUSED */
 153         if (mine->buffer != NULL)
 154                 free(mine->buffer);
 155         free(mine);
 156         return (ARCHIVE_OK);
 157 }