1228753Smm/*- 2228753Smm * Copyright (c) 2003-2007 Tim Kientzle 3228753Smm * All rights reserved. 4228753Smm * 5228753Smm * Redistribution and use in source and binary forms, with or without 6228753Smm * modification, are permitted provided that the following conditions 7228753Smm * are met: 8228753Smm * 1. Redistributions of source code must retain the above copyright 9228753Smm * notice, this list of conditions and the following disclaimer. 10228753Smm * 2. Redistributions in binary form must reproduce the above copyright 11228753Smm * notice, this list of conditions and the following disclaimer in the 12228753Smm * documentation and/or other materials provided with the distribution. 13228753Smm * 14228753Smm * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 15228753Smm * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16228753Smm * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17228753Smm * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 18228753Smm * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19228753Smm * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20228753Smm * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21228753Smm * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22228753Smm * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23228753Smm * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24228753Smm */ 25228753Smm 26228753Smm#include "archive_platform.h" 27228763Smm__FBSDID("$FreeBSD: stable/10/contrib/libarchive/libarchive/archive_read_open_file.c 344674 2019-02-28 22:57:09Z mm $"); 28228753Smm 29228753Smm#ifdef HAVE_SYS_STAT_H 30228753Smm#include <sys/stat.h> 31228753Smm#endif 32228753Smm#ifdef HAVE_ERRNO_H 33228753Smm#include <errno.h> 34228753Smm#endif 35228753Smm#ifdef HAVE_FCNTL_H 36228753Smm#include <fcntl.h> 37228753Smm#endif 38228753Smm#ifdef HAVE_IO_H 39228753Smm#include <io.h> 40228753Smm#endif 41228753Smm#ifdef HAVE_STDLIB_H 42228753Smm#include <stdlib.h> 43228753Smm#endif 44228753Smm#ifdef HAVE_STRING_H 45228753Smm#include <string.h> 46228753Smm#endif 47228753Smm#ifdef HAVE_UNISTD_H 48228753Smm#include <unistd.h> 49228753Smm#endif 50228753Smm 51228753Smm#include "archive.h" 52228753Smm 53228753Smmstruct read_FILE_data { 54228753Smm FILE *f; 55228753Smm size_t block_size; 56228753Smm void *buffer; 57228753Smm char can_skip; 58228753Smm}; 59228753Smm 60228753Smmstatic int file_close(struct archive *, void *); 61228753Smmstatic ssize_t file_read(struct archive *, void *, const void **buff); 62232153Smmstatic int64_t file_skip(struct archive *, void *, int64_t request); 63228753Smm 64228753Smmint 65228753Smmarchive_read_open_FILE(struct archive *a, FILE *f) 66228753Smm{ 67228753Smm struct stat st; 68228753Smm struct read_FILE_data *mine; 69228753Smm size_t block_size = 128 * 1024; 70228753Smm void *b; 71228753Smm 72228753Smm archive_clear_error(a); 73228753Smm mine = (struct read_FILE_data *)malloc(sizeof(*mine)); 74228753Smm b = malloc(block_size); 75228753Smm if (mine == NULL || b == NULL) { 76228753Smm archive_set_error(a, ENOMEM, "No memory"); 77228753Smm free(mine); 78228753Smm free(b); 79228753Smm return (ARCHIVE_FATAL); 80228753Smm } 81228753Smm mine->block_size = block_size; 82228753Smm mine->buffer = b; 83228753Smm mine->f = f; 84228753Smm /* 85228753Smm * If we can't fstat() the file, it may just be that it's not 86302001Smm * a file. (On some platforms, FILE * objects can wrap I/O 87302001Smm * streams that don't support fileno()). As a result, fileno() 88302001Smm * should be used cautiously.) 89228753Smm */ 90228753Smm if (fstat(fileno(mine->f), &st) == 0 && S_ISREG(st.st_mode)) { 91228753Smm archive_read_extract_set_skip_file(a, st.st_dev, st.st_ino); 92228753Smm /* Enable the seek optimization only for regular files. */ 93228753Smm mine->can_skip = 1; 94228753Smm } else 95228753Smm mine->can_skip = 0; 96228753Smm 97228753Smm#if defined(__CYGWIN__) || defined(_WIN32) 98228753Smm setmode(fileno(mine->f), O_BINARY); 99228753Smm#endif 100228753Smm 101232153Smm archive_read_set_read_callback(a, file_read); 102232153Smm archive_read_set_skip_callback(a, file_skip); 103232153Smm archive_read_set_close_callback(a, file_close); 104232153Smm archive_read_set_callback_data(a, mine); 105232153Smm return (archive_read_open1(a)); 106228753Smm} 107228753Smm 108228753Smmstatic ssize_t 109228753Smmfile_read(struct archive *a, void *client_data, const void **buff) 110228753Smm{ 111228753Smm struct read_FILE_data *mine = (struct read_FILE_data *)client_data; 112248616Smm size_t bytes_read; 113228753Smm 114228753Smm *buff = mine->buffer; 115228753Smm bytes_read = fread(mine->buffer, 1, mine->block_size, mine->f); 116248616Smm if (bytes_read < mine->block_size && ferror(mine->f)) { 117228753Smm archive_set_error(a, errno, "Error reading file"); 118228753Smm } 119228753Smm return (bytes_read); 120228753Smm} 121228753Smm 122232153Smmstatic int64_t 123232153Smmfile_skip(struct archive *a, void *client_data, int64_t request) 124232153Smm{ 125232153Smm struct read_FILE_data *mine = (struct read_FILE_data *)client_data; 126232153Smm#if HAVE_FSEEKO 127232153Smm off_t skip = (off_t)request; 128232153Smm#elif HAVE__FSEEKI64 129232153Smm int64_t skip = request; 130228753Smm#else 131232153Smm long skip = (long)request; 132228753Smm#endif 133232153Smm int skip_bits = sizeof(skip) * 8 - 1; 134228753Smm 135228753Smm (void)a; /* UNUSED */ 136228753Smm 137228753Smm /* 138228753Smm * If we can't skip, return 0 as the amount we did step and 139228753Smm * the caller will work around by reading and discarding. 140228753Smm */ 141228753Smm if (!mine->can_skip) 142228753Smm return (0); 143228753Smm if (request == 0) 144228753Smm return (0); 145228753Smm 146232153Smm /* If request is too big for a long or an off_t, reduce it. */ 147232153Smm if (sizeof(request) > sizeof(skip)) { 148232153Smm int64_t max_skip = 149232153Smm (((int64_t)1 << (skip_bits - 1)) - 1) * 2 + 1; 150232153Smm if (request > max_skip) 151232153Smm skip = max_skip; 152232153Smm } 153232153Smm 154302001Smm#ifdef __ANDROID__ 155302001Smm /* fileno() isn't safe on all platforms ... see above. */ 156302001Smm if (lseek(fileno(mine->f), skip, SEEK_CUR) < 0) 157302001Smm#elif HAVE_FSEEKO 158232153Smm if (fseeko(mine->f, skip, SEEK_CUR) != 0) 159232153Smm#elif HAVE__FSEEKI64 160232153Smm if (_fseeki64(mine->f, skip, SEEK_CUR) != 0) 161228753Smm#else 162232153Smm if (fseek(mine->f, skip, SEEK_CUR) != 0) 163228753Smm#endif 164228753Smm { 165228753Smm mine->can_skip = 0; 166228753Smm return (0); 167228753Smm } 168228753Smm return (request); 169228753Smm} 170228753Smm 171228753Smmstatic int 172228753Smmfile_close(struct archive *a, void *client_data) 173228753Smm{ 174228753Smm struct read_FILE_data *mine = (struct read_FILE_data *)client_data; 175228753Smm 176228753Smm (void)a; /* UNUSED */ 177344674Smm free(mine->buffer); 178228753Smm free(mine); 179228753Smm return (ARCHIVE_OK); 180228753Smm} 181