1 /*- 2 * Copyright (c) 2003-2009 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 #include "archive_platform.h" 26 27 #ifdef HAVE_ERRNO_H 28 #include <errno.h> 29 #endif 30 #include <stdio.h> 31 #ifdef HAVE_STDLIB_H 32 #include <stdlib.h> 33 #endif 34 35 #include "archive.h" 36 #include "archive_entry.h" 37 #include "archive_private.h" 38 #include "archive_read_private.h" 39 40 struct raw_info { 41 int64_t offset; /* Current position in the file. */ 42 int64_t unconsumed; 43 int end_of_file; 44 }; 45 46 static int archive_read_format_raw_bid(struct archive_read *, int); 47 static int archive_read_format_raw_cleanup(struct archive_read *); 48 static int archive_read_format_raw_read_data(struct archive_read *, 49 const void **, size_t *, int64_t *); 50 static int archive_read_format_raw_read_data_skip(struct archive_read *); 51 static int archive_read_format_raw_read_header(struct archive_read *, 52 struct archive_entry *); 53 54 int 55 archive_read_support_format_raw(struct archive *_a) 56 { 57 struct raw_info *info; 58 struct archive_read *a = (struct archive_read *)_a; 59 int r; 60 61 archive_check_magic(_a, ARCHIVE_READ_MAGIC, 62 ARCHIVE_STATE_NEW, "archive_read_support_format_raw"); 63 64 info = calloc(1, sizeof(*info)); 65 if (info == NULL) { 66 archive_set_error(&a->archive, ENOMEM, 67 "Can't allocate raw_info data"); 68 return (ARCHIVE_FATAL); 69 } 70 71 r = __archive_read_register_format(a, 72 info, 73 "raw", 74 archive_read_format_raw_bid, 75 NULL, 76 archive_read_format_raw_read_header, 77 archive_read_format_raw_read_data, 78 archive_read_format_raw_read_data_skip, 79 NULL, 80 archive_read_format_raw_cleanup, 81 NULL, 82 NULL); 83 if (r != ARCHIVE_OK) 84 free(info); 85 return (r); 86 } 87 88 /* 89 * Bid 1 if this is a non-empty file. Anyone who can really support 90 * this should outbid us, so it should generally be safe to use "raw" 91 * in conjunction with other formats. But, this could really confuse 92 * folks if there are bid errors or minor file damage, so we don't 93 * include "raw" as part of support_format_all(). 94 */ 95 static int 96 archive_read_format_raw_bid(struct archive_read *a, int best_bid) 97 { 98 if (best_bid < 1 && __archive_read_ahead(a, 1, NULL) != NULL) 99 return (1); 100 return (-1); 101 } 102 103 /* 104 * Mock up a fake header. 105 */ 106 static int 107 archive_read_format_raw_read_header(struct archive_read *a, 108 struct archive_entry *entry) 109 { 110 struct raw_info *info; 111 112 info = (struct raw_info *)(a->format->data); 113 if (info->end_of_file) 114 return (ARCHIVE_EOF); 115 116 a->archive.archive_format = ARCHIVE_FORMAT_RAW; 117 a->archive.archive_format_name = "raw"; 118 archive_entry_set_pathname(entry, "data"); 119 archive_entry_set_filetype(entry, AE_IFREG); 120 archive_entry_set_perm(entry, 0644); 121 /* I'm deliberately leaving most fields unset here. */ 122 123 /* Let the filter fill out any fields it might have. */ 124 return __archive_read_header(a, entry); 125 } 126 127 static int 128 archive_read_format_raw_read_data(struct archive_read *a, 129 const void **buff, size_t *size, int64_t *offset) 130 { 131 struct raw_info *info; 132 ssize_t avail; 133 134 info = (struct raw_info *)(a->format->data); 135 136 /* Consume the bytes we read last time. */ 137 if (info->unconsumed) { 138 __archive_read_consume(a, info->unconsumed); 139 info->unconsumed = 0; 140 } 141 142 if (info->end_of_file) 143 return (ARCHIVE_EOF); 144 145 /* Get whatever bytes are immediately available. */ 146 *buff = __archive_read_ahead(a, 1, &avail); 147 if (avail > 0) { 148 /* Return the bytes we just read */ 149 *size = avail; 150 *offset = info->offset; 151 info->offset += *size; 152 info->unconsumed = avail; 153 return (ARCHIVE_OK); 154 } else if (0 == avail) { 155 /* Record and return end-of-file. */ 156 info->end_of_file = 1; 157 *size = 0; 158 *offset = info->offset; 159 return (ARCHIVE_EOF); 160 } else { 161 /* Record and return an error. */ 162 *size = 0; 163 *offset = info->offset; 164 return ((int)avail); 165 } 166 } 167 168 static int 169 archive_read_format_raw_read_data_skip(struct archive_read *a) 170 { 171 struct raw_info *info = (struct raw_info *)(a->format->data); 172 173 /* Consume the bytes we read last time. */ 174 if (info->unconsumed) { 175 __archive_read_consume(a, info->unconsumed); 176 info->unconsumed = 0; 177 } 178 info->end_of_file = 1; 179 return (ARCHIVE_OK); 180 } 181 182 static int 183 archive_read_format_raw_cleanup(struct archive_read *a) 184 { 185 struct raw_info *info; 186 187 info = (struct raw_info *)(a->format->data); 188 free(info); 189 a->format->data = NULL; 190 return (ARCHIVE_OK); 191 } 192