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: head/lib/libarchive/archive_read_open_file.c 201093 2009-12-28 02:28:44Z kientzle $"); 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_IO_H 39 #include <io.h> 40 #endif 41 #ifdef HAVE_STDLIB_H 42 #include <stdlib.h> 43 #endif 44 #ifdef HAVE_STRING_H 45 #include <string.h> 46 #endif 47 #ifdef HAVE_UNISTD_H 48 #include <unistd.h> 49 #endif 50 51 #include "archive.h" 52 53 struct read_FILE_data { 54 FILE *f; 55 size_t block_size; 56 void *buffer; 57 char can_skip; 58 }; 59 60 static int file_close(struct archive *, void *); 61 static ssize_t file_read(struct archive *, void *, const void **buff); 62 #if ARCHIVE_API_VERSION < 2 63 static ssize_t file_skip(struct archive *, void *, size_t request); 64 #else 65 static off_t file_skip(struct archive *, void *, off_t request); 66 #endif 67 68 int 69 archive_read_open_FILE(struct archive *a, FILE *f) 70 { 71 struct stat st; 72 struct read_FILE_data *mine; 73 size_t block_size = 128 * 1024; 74 void *b; 75 76 archive_clear_error(a); 77 mine = (struct read_FILE_data *)malloc(sizeof(*mine)); 78 b = malloc(block_size); 79 if (mine == NULL || b == NULL) { 80 archive_set_error(a, ENOMEM, "No memory"); 81 free(mine); 82 free(b); 83 return (ARCHIVE_FATAL); 84 } 85 mine->block_size = block_size; 86 mine->buffer = b; 87 mine->f = f; 88 /* 89 * If we can't fstat() the file, it may just be that it's not 90 * a file. (FILE * objects can wrap many kinds of I/O 91 * streams, some of which don't support fileno()).) 92 */ 93 if (fstat(fileno(mine->f), &st) == 0 && S_ISREG(st.st_mode)) { 94 archive_read_extract_set_skip_file(a, st.st_dev, st.st_ino); 95 /* Enable the seek optimization only for regular files. */ 96 mine->can_skip = 1; 97 } else 98 mine->can_skip = 0; 99 100 #if defined(__CYGWIN__) || defined(_WIN32) 101 setmode(fileno(mine->f), O_BINARY); 102 #endif 103 104 return (archive_read_open2(a, mine, NULL, file_read, 105 file_skip, file_close)); 106 } 107 108 static ssize_t 109 file_read(struct archive *a, void *client_data, const void **buff) 110 { 111 struct read_FILE_data *mine = (struct read_FILE_data *)client_data; 112 ssize_t bytes_read; 113 114 *buff = mine->buffer; 115 bytes_read = fread(mine->buffer, 1, mine->block_size, mine->f); 116 if (bytes_read < 0) { 117 archive_set_error(a, errno, "Error reading file"); 118 } 119 return (bytes_read); 120 } 121 122 #if ARCHIVE_API_VERSION < 2 123 static ssize_t 124 file_skip(struct archive *a, void *client_data, size_t request) 125 #else 126 static off_t 127 file_skip(struct archive *a, void *client_data, off_t request) 128 #endif 129 { 130 struct read_FILE_data *mine = (struct read_FILE_data *)client_data; 131 132 (void)a; /* UNUSED */ 133 134 /* 135 * If we can't skip, return 0 as the amount we did step and 136 * the caller will work around by reading and discarding. 137 */ 138 if (!mine->can_skip) 139 return (0); 140 if (request == 0) 141 return (0); 142 143 #if HAVE_FSEEKO 144 if (fseeko(mine->f, request, SEEK_CUR) != 0) 145 #else 146 if (fseek(mine->f, request, SEEK_CUR) != 0) 147 #endif 148 { 149 mine->can_skip = 0; 150 return (0); 151 } 152 return (request); 153 } 154 155 static int 156 file_close(struct archive *a, void *client_data) 157 { 158 struct read_FILE_data *mine = (struct read_FILE_data *)client_data; 159 160 (void)a; /* UNUSED */ 161 if (mine->buffer != NULL) 162 free(mine->buffer); 163 free(mine); 164 return (ARCHIVE_OK); 165 } 166