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 28 #include "archive.h" 29 #include "archive_entry.h" 30 #include "archive_private.h" 31 #include "archive_read_private.h" 32 33 static int archive_read_format_empty_bid(struct archive_read *, int); 34 static int archive_read_format_empty_read_data(struct archive_read *, 35 const void **, size_t *, int64_t *); 36 static int archive_read_format_empty_read_header(struct archive_read *, 37 struct archive_entry *); 38 int 39 archive_read_support_format_empty(struct archive *_a) 40 { 41 struct archive_read *a = (struct archive_read *)_a; 42 int r; 43 44 archive_check_magic(_a, ARCHIVE_READ_MAGIC, 45 ARCHIVE_STATE_NEW, "archive_read_support_format_empty"); 46 47 r = __archive_read_register_format(a, 48 NULL, 49 "empty", 50 archive_read_format_empty_bid, 51 NULL, 52 archive_read_format_empty_read_header, 53 archive_read_format_empty_read_data, 54 NULL, 55 NULL, 56 NULL, 57 NULL, 58 NULL); 59 60 return (r); 61 } 62 63 64 static int 65 archive_read_format_empty_bid(struct archive_read *a, int best_bid) 66 { 67 if (best_bid < 1 && __archive_read_ahead(a, 1, NULL) == NULL) 68 return (1); 69 return (-1); 70 } 71 72 static int 73 archive_read_format_empty_read_header(struct archive_read *a, 74 struct archive_entry *entry) 75 { 76 (void)a; /* UNUSED */ 77 (void)entry; /* UNUSED */ 78 79 a->archive.archive_format = ARCHIVE_FORMAT_EMPTY; 80 a->archive.archive_format_name = "Empty file"; 81 82 return (ARCHIVE_EOF); 83 } 84 85 static int 86 archive_read_format_empty_read_data(struct archive_read *a, 87 const void **buff, size_t *size, int64_t *offset) 88 { 89 (void)a; /* UNUSED */ 90 (void)buff; /* UNUSED */ 91 (void)size; /* UNUSED */ 92 (void)offset; /* UNUSED */ 93 94 return (ARCHIVE_EOF); 95 } 96