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("$FreeBSD$"); 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 53struct read_FILE_data { 54 FILE *f; 55 size_t block_size; 56 void *buffer; 57 char can_skip; 58}; 59 60static int file_close(struct archive *, void *); 61static ssize_t file_read(struct archive *, void *, const void **buff); 62#if ARCHIVE_API_VERSION < 2 63static ssize_t file_skip(struct archive *, void *, size_t request); 64#else 65static off_t file_skip(struct archive *, void *, off_t request); 66#endif 67 68int 69archive_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 108static ssize_t 109file_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 123static ssize_t 124file_skip(struct archive *a, void *client_data, size_t request) 125#else 126static off_t 127file_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 155static int 156file_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