contrib/libarchive-2.0/libarchive/archive_read_extract.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_extract.c,v 1.55 2007/04/07 03:37:59 cperciva Exp $");
  28
  29 #ifdef HAVE_SYS_TYPES_H
  30 #include <sys/types.h>
  31 #endif
  32 #ifdef HAVE_ERRNO_H
  33 #include <errno.h>
  34 #endif
  35 #ifdef HAVE_STDLIB_H
  36 #include <stdlib.h>
  37 #endif
  38 #ifdef HAVE_STRING_H
  39 #include <string.h>
  40 #endif
  41
  42 #include "archive.h"
  43 #include "archive_private.h"
  44 #include "archive_read_private.h"
  45 #include "archive_write_disk_private.h"
  46
  47 struct extract {
  48         struct archive *ad; /* archive_write_disk object */
  49
  50         /* Progress function invoked during extract. */
  51         void                    (*extract_progress)(void *);
  52         void                     *extract_progress_user_data;
  53 };
  54
  55 static int      archive_read_extract_cleanup(struct archive_read *);
  56 static int      copy_data(struct archive *ar, struct archive *aw);
  57 static struct extract *get_extract(struct archive_read *);
  58
  59 static struct extract *
  60 get_extract(struct archive_read *a)
  61 {
  62         /* If we haven't initialized, do it now. */
  63         /* This also sets up a lot of global state. */
  64         if (a->extract == NULL) {
  65                 a->extract = (struct extract *)malloc(sizeof(*a->extract));
  66                 if (a->extract == NULL) {
  67                         archive_set_error(&a->archive, ENOMEM, "Can't extract");
  68                         return (NULL);
  69                 }
  70                 a->extract->ad = archive_write_disk_new();
  71                 if (a->extract->ad == NULL) {
  72                         archive_set_error(&a->archive, ENOMEM, "Can't extract");
  73                         return (NULL);
  74                 }
  75                 archive_write_disk_set_standard_lookup(a->extract->ad);
  76                 a->cleanup_archive_extract = archive_read_extract_cleanup;
  77         }
  78         return (a->extract);
  79 }
  80
  81 int
  82 archive_read_extract(struct archive *_a, struct archive_entry *entry, int flags)
  83 {
  84         struct archive_read *a = (struct archive_read *)_a;
  85         struct extract *extract;
  86         int r, r2;
  87
  88         extract = get_extract(a);
  89         if (extract == NULL)
  90                 return (ARCHIVE_FATAL);
  91
  92         /* Set up for this particular entry. */
  93         extract = a->extract;
  94         archive_write_disk_set_options(a->extract->ad, flags);
  95         archive_write_disk_set_skip_file(a->extract->ad,
  96             a->skip_file_dev, a->skip_file_ino);
  97         r = archive_write_header(a->extract->ad, entry);
  98         if (r == ARCHIVE_OK)
  99                 /* If there's an FD, pour data into it. */
 100                 r = copy_data(_a, a->extract->ad);
 101         r2 = archive_write_finish_entry(a->extract->ad);
 102         /* Use the first message. */
 103         if (r2 != ARCHIVE_OK && r == ARCHIVE_OK)
 104                 archive_set_error(&a->archive,
 105                     archive_errno(extract->ad),
 106                     "%s", archive_error_string(extract->ad));
 107         /* Use the worst error return. */
 108         if (r2 < r)
 109                 r = r2;
 110         return (r);
 111 }
 112
 113 void
 114 archive_read_extract_set_progress_callback(struct archive *_a,
 115     void (*progress_func)(void *), void *user_data)
 116 {
 117         struct archive_read *a = (struct archive_read *)_a;
 118         struct extract *extract = get_extract(a);
 119         if (extract != NULL) {
 120                 extract->extract_progress = progress_func;
 121                 extract->extract_progress_user_data = user_data;
 122         }
 123 }
 124
 125 static int
 126 copy_data(struct archive *ar, struct archive *aw)
 127 {
 128         int r;
 129         const void *buff;
 130         size_t size;
 131         off_t offset;
 132
 133         for (;;) {
 134                 r = archive_read_data_block(ar, &buff, &size, &offset);
 135                 if (r == ARCHIVE_EOF)
 136                         return (ARCHIVE_OK);
 137                 if (r != ARCHIVE_OK)
 138                         return (r);
 139                 r = archive_write_data_block(aw, buff, size, offset);
 140                 if (r != ARCHIVE_OK) {
 141                         archive_set_error(ar, archive_errno(aw),
 142                             "%s", archive_error_string(aw));
 143                         return (r);
 144                 }
 145         }
 146 }
 147
 148 /*
 149  * Cleanup function for archive_extract.
 150  */
 151 static int
 152 archive_read_extract_cleanup(struct archive_read *a)
 153 {
 154         int ret = ARCHIVE_OK;
 155
 156 #if ARCHIVE_API_VERSION > 1
 157         ret =
 158 #endif
 159             archive_write_finish(a->extract->ad);
 160         free(a->extract);
 161         a->extract = NULL;
 162         return (ret);
 163 }