158 lines
4.5 KiB
C
158 lines
4.5 KiB
C
/*-
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* Copyright (c) 2003-2004 Tim Kientzle
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "archive_platform.h"
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__FBSDID("$FreeBSD$");
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include "archive.h"
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struct read_fd_data {
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int fd;
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size_t block_size;
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void *buffer;
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};
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static int file_close(struct archive *, void *);
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static int file_open(struct archive *, void *);
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static ssize_t file_read(struct archive *, void *, const void **buff);
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static ssize_t file_skip(struct archive *, void *, size_t request);
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int
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archive_read_open_fd(struct archive *a, int fd, size_t block_size)
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{
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struct read_fd_data *mine;
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mine = (struct read_fd_data *)malloc(sizeof(*mine));
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if (mine == NULL) {
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archive_set_error(a, ENOMEM, "No memory");
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return (ARCHIVE_FATAL);
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}
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mine->block_size = block_size;
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mine->buffer = malloc(mine->block_size);
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if (mine->buffer == NULL) {
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archive_set_error(a, ENOMEM, "No memory");
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free(mine);
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return (ARCHIVE_FATAL);
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}
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mine->fd = fd;
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return (archive_read_open2(a, mine, file_open, file_read, file_skip, file_close));
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}
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static int
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file_open(struct archive *a, void *client_data)
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{
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struct read_fd_data *mine = (struct read_fd_data *)client_data;
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struct stat st;
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if (fstat(mine->fd, &st) != 0) {
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archive_set_error(a, errno, "Can't stat fd %d", mine->fd);
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return (ARCHIVE_FATAL);
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}
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if (S_ISREG(st.st_mode))
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archive_read_extract_set_skip_file(a, st.st_dev, st.st_ino);
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return (ARCHIVE_OK);
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}
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static ssize_t
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file_read(struct archive *a, void *client_data, const void **buff)
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{
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struct read_fd_data *mine = (struct read_fd_data *)client_data;
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ssize_t bytes_read;
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*buff = mine->buffer;
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bytes_read = read(mine->fd, mine->buffer, mine->block_size);
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if (bytes_read < 0) {
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archive_set_error(a, errno, "Error reading fd %d", mine->fd);
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}
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return (bytes_read);
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}
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static ssize_t
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file_skip(struct archive *a, void *client_data, size_t request)
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{
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struct read_fd_data *mine = (struct read_fd_data *)client_data;
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off_t old_offset, new_offset;
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/* Reduce request to the next smallest multiple of block_size */
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request = (request / mine->block_size) * mine->block_size;
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/*
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* Hurray for lazy evaluation: if the first lseek fails, the second
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* one will not be executed.
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*/
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if (((old_offset = lseek(mine->fd, 0, SEEK_CUR)) < 0) ||
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((new_offset = lseek(mine->fd, request, SEEK_CUR)) < 0))
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{
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if (errno == ESPIPE)
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{
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/*
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* Failure to lseek() can be caused by the file
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* descriptor pointing to a pipe, socket or FIFO.
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* Return 0 here, so the compression layer will use
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* read()s instead to advance the file descriptor.
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* It's slower of course, but works as well.
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*/
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return (0);
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}
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/*
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* There's been an error other than ESPIPE. This is most
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* likely caused by a programmer error (too large request)
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* or a corrupted archive file.
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*/
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archive_set_error(a, errno, "Error seeking");
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return (-1);
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}
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return (new_offset - old_offset);
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}
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static int
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file_close(struct archive *a, void *client_data)
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{
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struct read_fd_data *mine = (struct read_fd_data *)client_data;
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(void)a; /* UNUSED */
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if (mine->buffer != NULL)
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free(mine->buffer);
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free(mine);
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return (ARCHIVE_OK);
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}
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