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("$FreeBSD$"); 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; 56232153Smm char use_lseek; 57228753Smm void *buffer; 58228753Smm}; 59228753Smm 60228753Smmstatic int file_close(struct archive *, void *); 61228753Smmstatic ssize_t file_read(struct archive *, void *, const void **buff); 62302001Smmstatic int64_t file_seek(struct archive *, void *, int64_t request, int); 63232153Smmstatic int64_t file_skip(struct archive *, void *, int64_t request); 64228753Smm 65228753Smmint 66228753Smmarchive_read_open_fd(struct archive *a, int fd, size_t block_size) 67228753Smm{ 68228753Smm struct stat st; 69228753Smm struct read_fd_data *mine; 70228753Smm void *b; 71228753Smm 72228753Smm archive_clear_error(a); 73228753Smm if (fstat(fd, &st) != 0) { 74228753Smm archive_set_error(a, errno, "Can't stat fd %d", fd); 75228753Smm return (ARCHIVE_FATAL); 76228753Smm } 77228753Smm 78232153Smm mine = (struct read_fd_data *)calloc(1, sizeof(*mine)); 79228753Smm b = malloc(block_size); 80228753Smm if (mine == NULL || b == NULL) { 81228753Smm archive_set_error(a, ENOMEM, "No memory"); 82228753Smm free(mine); 83228753Smm free(b); 84228753Smm return (ARCHIVE_FATAL); 85228753Smm } 86228753Smm mine->block_size = block_size; 87228753Smm mine->buffer = b; 88228753Smm mine->fd = fd; 89228753Smm /* 90228753Smm * Skip support is a performance optimization for anything 91228753Smm * that supports lseek(). On FreeBSD, only regular files and 92228753Smm * raw disk devices support lseek() and there's no portable 93228753Smm * way to determine if a device is a raw disk device, so we 94228753Smm * only enable this optimization for regular files. 95228753Smm */ 96228753Smm if (S_ISREG(st.st_mode)) { 97228753Smm archive_read_extract_set_skip_file(a, st.st_dev, st.st_ino); 98232153Smm mine->use_lseek = 1; 99232153Smm } 100228753Smm#if defined(__CYGWIN__) || defined(_WIN32) 101228753Smm setmode(mine->fd, O_BINARY); 102228753Smm#endif 103228753Smm 104232153Smm archive_read_set_read_callback(a, file_read); 105232153Smm archive_read_set_skip_callback(a, file_skip); 106302001Smm archive_read_set_seek_callback(a, file_seek); 107232153Smm archive_read_set_close_callback(a, file_close); 108232153Smm archive_read_set_callback_data(a, mine); 109232153Smm return (archive_read_open1(a)); 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; 124248616Smm archive_set_error(a, errno, "Error reading fd %d", 125248616Smm mine->fd); 126228753Smm } 127228753Smm return (bytes_read); 128228753Smm } 129228753Smm} 130228753Smm 131232153Smmstatic int64_t 132232153Smmfile_skip(struct archive *a, void *client_data, int64_t request) 133228753Smm{ 134228753Smm struct read_fd_data *mine = (struct read_fd_data *)client_data; 135238856Smm int64_t skip = request; 136238856Smm int64_t old_offset, new_offset; 137232153Smm int skip_bits = sizeof(skip) * 8 - 1; /* off_t is a signed type. */ 138228753Smm 139232153Smm if (!mine->use_lseek) 140228753Smm return (0); 141228753Smm 142232153Smm /* Reduce a request that would overflow the 'skip' variable. */ 143232153Smm if (sizeof(request) > sizeof(skip)) { 144232153Smm int64_t max_skip = 145232153Smm (((int64_t)1 << (skip_bits - 1)) - 1) * 2 + 1; 146232153Smm if (request > max_skip) 147232153Smm skip = max_skip; 148232153Smm } 149232153Smm 150228753Smm /* Reduce request to the next smallest multiple of block_size */ 151228753Smm request = (request / mine->block_size) * mine->block_size; 152228753Smm if (request == 0) 153228753Smm return (0); 154228753Smm 155232153Smm if (((old_offset = lseek(mine->fd, 0, SEEK_CUR)) >= 0) && 156232153Smm ((new_offset = lseek(mine->fd, skip, SEEK_CUR)) >= 0)) 157232153Smm return (new_offset - old_offset); 158232153Smm 159232153Smm /* If seek failed once, it will probably fail again. */ 160232153Smm mine->use_lseek = 0; 161232153Smm 162232153Smm /* Let libarchive recover with read+discard. */ 163232153Smm if (errno == ESPIPE) 164232153Smm return (0); 165232153Smm 166228753Smm /* 167232153Smm * There's been an error other than ESPIPE. This is most 168232153Smm * likely caused by a programmer error (too large request) 169232153Smm * or a corrupted archive file. 170228753Smm */ 171232153Smm archive_set_error(a, errno, "Error seeking"); 172232153Smm return (-1); 173228753Smm} 174228753Smm 175302001Smm/* 176302001Smm * TODO: Store the offset and use it in the read callback. 177302001Smm */ 178302001Smmstatic int64_t 179302001Smmfile_seek(struct archive *a, void *client_data, int64_t request, int whence) 180302001Smm{ 181302001Smm struct read_fd_data *mine = (struct read_fd_data *)client_data; 182302001Smm int64_t r; 183302001Smm 184302001Smm /* We use off_t here because lseek() is declared that way. */ 185302001Smm /* See above for notes about when off_t is less than 64 bits. */ 186302001Smm r = lseek(mine->fd, request, whence); 187302001Smm if (r >= 0) 188302001Smm return r; 189302001Smm 190302001Smm if (errno == ESPIPE) { 191302001Smm archive_set_error(a, errno, 192302001Smm "A file descriptor(%d) is not seekable(PIPE)", mine->fd); 193302001Smm return (ARCHIVE_FAILED); 194302001Smm } else { 195302001Smm /* If the input is corrupted or truncated, fail. */ 196302001Smm archive_set_error(a, errno, 197302001Smm "Error seeking in a file descriptor(%d)", mine->fd); 198302001Smm return (ARCHIVE_FATAL); 199302001Smm } 200302001Smm} 201302001Smm 202228753Smmstatic int 203228753Smmfile_close(struct archive *a, void *client_data) 204228753Smm{ 205228753Smm struct read_fd_data *mine = (struct read_fd_data *)client_data; 206228753Smm 207228753Smm (void)a; /* UNUSED */ 208228753Smm free(mine->buffer); 209228753Smm free(mine); 210228753Smm return (ARCHIVE_OK); 211228753Smm} 212