234 lines
6.6 KiB
C
234 lines
6.6 KiB
C
/*-
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* Copyright (c) 2003-2007 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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* 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_FCNTL_H
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#include <fcntl.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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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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struct read_file_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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mode_t st_mode; /* Mode bits for opened file. */
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char can_skip; /* This file supports skipping. */
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char filename[1]; /* Must be last! */
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};
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static int file_close(struct archive *, void *);
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static ssize_t file_read(struct archive *, void *, const void **buff);
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#if ARCHIVE_API_VERSION < 2
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static ssize_t file_skip(struct archive *, void *, size_t request);
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#else
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static off_t file_skip(struct archive *, void *, off_t request);
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#endif
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int
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archive_read_open_file(struct archive *a, const char *filename,
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size_t block_size)
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{
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return (archive_read_open_filename(a, filename, block_size));
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}
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int
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archive_read_open_filename(struct archive *a, const char *filename,
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size_t block_size)
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{
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struct stat st;
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struct read_file_data *mine;
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void *b;
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int fd;
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archive_clear_error(a);
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if (filename == NULL || filename[0] == '\0')
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return (archive_read_open_fd(a, 0, block_size));
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fd = open(filename, O_RDONLY | O_BINARY);
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if (fd < 0) {
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archive_set_error(a, errno, "Failed to open '%s'", filename);
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return (ARCHIVE_FATAL);
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}
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if (fstat(fd, &st) != 0) {
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archive_set_error(a, errno, "Can't stat '%s'", filename);
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return (ARCHIVE_FATAL);
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}
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mine = (struct read_file_data *)malloc(sizeof(*mine) + strlen(filename));
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b = malloc(block_size);
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if (mine == NULL || b == NULL) {
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archive_set_error(a, ENOMEM, "No memory");
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free(mine);
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free(b);
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return (ARCHIVE_FATAL);
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}
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strcpy(mine->filename, filename);
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mine->block_size = block_size;
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mine->buffer = b;
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mine->fd = fd;
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/* Remember mode so close can decide whether to flush. */
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mine->st_mode = st.st_mode;
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/* If we're reading a file from disk, ensure that we don't
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overwrite it with an extracted file. */
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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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/*
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* Skip is a performance optimization for anything
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* that supports lseek(). Generally, that only
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* includes regular files and possibly raw disk
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* devices, but there's no good portable way to detect
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* raw disks.
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*/
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mine->can_skip = 1;
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} else
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mine->can_skip = 0;
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return (archive_read_open2(a, mine,
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NULL, file_read, file_skip, file_close));
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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_file_data *mine = (struct read_file_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 '%s'",
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mine->filename);
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}
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return (bytes_read);
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}
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#if ARCHIVE_API_VERSION < 2
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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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#else
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static off_t
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file_skip(struct archive *a, void *client_data, off_t request)
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#endif
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{
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struct read_file_data *mine = (struct read_file_data *)client_data;
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off_t old_offset, new_offset;
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if (!mine->can_skip) /* We can't skip, so ... */
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return (0); /* ... skip zero bytes. */
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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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if (request == 0)
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return (0);
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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 skip failed once, it will probably fail again. */
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mine->can_skip = 0;
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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 in '%s'",
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mine->filename);
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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_file_data *mine = (struct read_file_data *)client_data;
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(void)a; /* UNUSED */
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/* Only flush and close if open succeeded. */
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if (mine->fd >= 0) {
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/*
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* Sometimes, we should flush the input before closing.
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* Regular files: faster to just close without flush.
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* Devices: must not flush (user might need to
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* read the "next" item on a non-rewind device).
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* Pipes and sockets: must flush (otherwise, the
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* program feeding the pipe or socket may complain).
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* Here, I flush everything except for regular files and
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* device nodes.
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*/
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if (!S_ISREG(mine->st_mode)
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&& !S_ISCHR(mine->st_mode)
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&& !S_ISBLK(mine->st_mode)) {
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ssize_t bytesRead;
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do {
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bytesRead = read(mine->fd, mine->buffer,
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mine->block_size);
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} while (bytesRead > 0);
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}
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close(mine->fd);
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}
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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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