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" 27229592Smm__FBSDID("$FreeBSD$"); 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_fd_data { 54228753Smm int fd; 55228753Smm size_t block_size; 56228753Smm char can_skip; 57228753Smm void *buffer; 58228753Smm}; 59228753Smm 60228753Smmstatic int file_close(struct archive *, void *); 61228753Smmstatic ssize_t file_read(struct archive *, void *, const void **buff); 62228753Smm#if ARCHIVE_API_VERSION < 2 63228753Smmstatic ssize_t file_skip(struct archive *, void *, size_t request); 64228753Smm#else 65228753Smmstatic off_t file_skip(struct archive *, void *, off_t request); 66228753Smm#endif 67228753Smm 68228753Smmint 69228753Smmarchive_read_open_fd(struct archive *a, int fd, size_t block_size) 70228753Smm{ 71228753Smm struct stat st; 72228753Smm struct read_fd_data *mine; 73228753Smm void *b; 74228753Smm 75228753Smm archive_clear_error(a); 76228753Smm if (fstat(fd, &st) != 0) { 77228753Smm archive_set_error(a, errno, "Can't stat fd %d", fd); 78228753Smm return (ARCHIVE_FATAL); 79228753Smm } 80228753Smm 81228753Smm mine = (struct read_fd_data *)malloc(sizeof(*mine)); 82228753Smm b = malloc(block_size); 83228753Smm if (mine == NULL || b == NULL) { 84228753Smm archive_set_error(a, ENOMEM, "No memory"); 85228753Smm free(mine); 86228753Smm free(b); 87228753Smm return (ARCHIVE_FATAL); 88228753Smm } 89228753Smm mine->block_size = block_size; 90228753Smm mine->buffer = b; 91228753Smm mine->fd = fd; 92228753Smm /* 93228753Smm * Skip support is a performance optimization for anything 94228753Smm * that supports lseek(). On FreeBSD, only regular files and 95228753Smm * raw disk devices support lseek() and there's no portable 96228753Smm * way to determine if a device is a raw disk device, so we 97228753Smm * only enable this optimization for regular files. 98228753Smm */ 99228753Smm if (S_ISREG(st.st_mode)) { 100228753Smm archive_read_extract_set_skip_file(a, st.st_dev, st.st_ino); 101228753Smm mine->can_skip = 1; 102228753Smm } else 103228753Smm mine->can_skip = 0; 104228753Smm#if defined(__CYGWIN__) || defined(_WIN32) 105228753Smm setmode(mine->fd, O_BINARY); 106228753Smm#endif 107228753Smm 108228753Smm return (archive_read_open2(a, mine, 109228753Smm NULL, file_read, file_skip, file_close)); 110228753Smm} 111228753Smm 112228753Smmstatic ssize_t 113228753Smmfile_read(struct archive *a, void *client_data, const void **buff) 114228753Smm{ 115228753Smm struct read_fd_data *mine = (struct read_fd_data *)client_data; 116228753Smm ssize_t bytes_read; 117228753Smm 118228753Smm *buff = mine->buffer; 119228753Smm for (;;) { 120228753Smm bytes_read = read(mine->fd, mine->buffer, mine->block_size); 121228753Smm if (bytes_read < 0) { 122228753Smm if (errno == EINTR) 123228753Smm continue; 124228753Smm archive_set_error(a, errno, "Error reading fd %d", mine->fd); 125228753Smm } 126228753Smm return (bytes_read); 127228753Smm } 128228753Smm} 129228753Smm 130228753Smm#if ARCHIVE_API_VERSION < 2 131228753Smmstatic ssize_t 132228753Smmfile_skip(struct archive *a, void *client_data, size_t request) 133228753Smm#else 134228753Smmstatic off_t 135228753Smmfile_skip(struct archive *a, void *client_data, off_t request) 136228753Smm#endif 137228753Smm{ 138228753Smm struct read_fd_data *mine = (struct read_fd_data *)client_data; 139228753Smm off_t old_offset, new_offset; 140228753Smm 141228753Smm if (!mine->can_skip) 142228753Smm return (0); 143228753Smm 144228753Smm /* Reduce request to the next smallest multiple of block_size */ 145228753Smm request = (request / mine->block_size) * mine->block_size; 146228753Smm if (request == 0) 147228753Smm return (0); 148228753Smm 149228753Smm /* 150228753Smm * Hurray for lazy evaluation: if the first lseek fails, the second 151228753Smm * one will not be executed. 152228753Smm */ 153228753Smm if (((old_offset = lseek(mine->fd, 0, SEEK_CUR)) < 0) || 154228753Smm ((new_offset = lseek(mine->fd, request, SEEK_CUR)) < 0)) 155228753Smm { 156228753Smm /* If seek failed once, it will probably fail again. */ 157228753Smm mine->can_skip = 0; 158228753Smm 159228753Smm if (errno == ESPIPE) 160228753Smm { 161228753Smm /* 162228753Smm * Failure to lseek() can be caused by the file 163228753Smm * descriptor pointing to a pipe, socket or FIFO. 164228753Smm * Return 0 here, so the compression layer will use 165228753Smm * read()s instead to advance the file descriptor. 166228753Smm * It's slower of course, but works as well. 167228753Smm */ 168228753Smm return (0); 169228753Smm } 170228753Smm /* 171228753Smm * There's been an error other than ESPIPE. This is most 172228753Smm * likely caused by a programmer error (too large request) 173228753Smm * or a corrupted archive file. 174228753Smm */ 175228753Smm archive_set_error(a, errno, "Error seeking"); 176228753Smm return (-1); 177228753Smm } 178228753Smm return (new_offset - old_offset); 179228753Smm} 180228753Smm 181228753Smmstatic int 182228753Smmfile_close(struct archive *a, void *client_data) 183228753Smm{ 184228753Smm struct read_fd_data *mine = (struct read_fd_data *)client_data; 185228753Smm 186228753Smm (void)a; /* UNUSED */ 187228753Smm free(mine->buffer); 188228753Smm free(mine); 189228753Smm return (ARCHIVE_OK); 190228753Smm} 191