archive_read_support_format_empty.c revision 368708
1279418Smarkj/*- 2279418Smarkj * Copyright (c) 2003-2007 Tim Kientzle 3279418Smarkj * All rights reserved. 4279418Smarkj * 5279418Smarkj * Redistribution and use in source and binary forms, with or without 6279418Smarkj * modification, are permitted provided that the following conditions 7279418Smarkj * are met: 8279418Smarkj * 1. Redistributions of source code must retain the above copyright 9279418Smarkj * notice, this list of conditions and the following disclaimer. 10279418Smarkj * 2. Redistributions in binary form must reproduce the above copyright 11279418Smarkj * notice, this list of conditions and the following disclaimer in the 12279418Smarkj * documentation and/or other materials provided with the distribution. 13279418Smarkj * 14279418Smarkj * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 15279418Smarkj * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16279418Smarkj * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17279418Smarkj * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 18279418Smarkj * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19279418Smarkj * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20279418Smarkj * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21279418Smarkj * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22279418Smarkj * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23279418Smarkj * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24279418Smarkj */ 25279418Smarkj 26279418Smarkj#include "archive_platform.h" 27279418Smarkj__FBSDID("$FreeBSD: stable/10/contrib/libarchive/libarchive/archive_read_support_format_empty.c 368708 2020-12-16 22:25:40Z mm $"); 28279418Smarkj 29279418Smarkj#include "archive.h" 30279418Smarkj#include "archive_entry.h" 31279418Smarkj#include "archive_private.h" 32279418Smarkj#include "archive_read_private.h" 33279418Smarkj 34279418Smarkjstatic int archive_read_format_empty_bid(struct archive_read *, int); 35279418Smarkjstatic int archive_read_format_empty_read_data(struct archive_read *, 36279418Smarkj const void **, size_t *, int64_t *); 37279418Smarkjstatic int archive_read_format_empty_read_header(struct archive_read *, 38279418Smarkj struct archive_entry *); 39279418Smarkjint 40279418Smarkjarchive_read_support_format_empty(struct archive *_a) 41279418Smarkj{ 42279418Smarkj struct archive_read *a = (struct archive_read *)_a; 43279418Smarkj int r; 44279418Smarkj 45279418Smarkj archive_check_magic(_a, ARCHIVE_READ_MAGIC, 46279418Smarkj ARCHIVE_STATE_NEW, "archive_read_support_format_empty"); 47279418Smarkj 48279418Smarkj r = __archive_read_register_format(a, 49279418Smarkj NULL, 50279418Smarkj "empty", 51279418Smarkj archive_read_format_empty_bid, 52279418Smarkj NULL, 53279418Smarkj archive_read_format_empty_read_header, 54279418Smarkj archive_read_format_empty_read_data, 55279418Smarkj NULL, 56279418Smarkj NULL, 57279418Smarkj NULL, 58279418Smarkj NULL, 59279418Smarkj NULL); 60279418Smarkj 61279418Smarkj return (r); 62279418Smarkj} 63279418Smarkj 64279418Smarkj 65279418Smarkjstatic int 66279418Smarkjarchive_read_format_empty_bid(struct archive_read *a, int best_bid) 67279418Smarkj{ 68279418Smarkj if (best_bid < 1 && __archive_read_ahead(a, 1, NULL) == NULL) 69279418Smarkj return (1); 70279418Smarkj return (-1); 71279418Smarkj} 72279418Smarkj 73279418Smarkjstatic int 74279418Smarkjarchive_read_format_empty_read_header(struct archive_read *a, 75279418Smarkj struct archive_entry *entry) 76279418Smarkj{ 77279418Smarkj (void)a; /* UNUSED */ 78279418Smarkj (void)entry; /* UNUSED */ 79279418Smarkj 80279418Smarkj a->archive.archive_format = ARCHIVE_FORMAT_EMPTY; 81279418Smarkj a->archive.archive_format_name = "Empty file"; 82279418Smarkj 83279418Smarkj return (ARCHIVE_EOF); 84279418Smarkj} 85279418Smarkj 86279418Smarkjstatic int 87279418Smarkjarchive_read_format_empty_read_data(struct archive_read *a, 88279418Smarkj const void **buff, size_t *size, int64_t *offset) 89279418Smarkj{ 90 (void)a; /* UNUSED */ 91 (void)buff; /* UNUSED */ 92 (void)size; /* UNUSED */ 93 (void)offset; /* UNUSED */ 94 95 return (ARCHIVE_EOF); 96} 97