668 lines
18 KiB
C
668 lines
18 KiB
C
/*-
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* Copyright (c) 2008 Anselm Strauss
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* Copyright (c) 2009 Joerg Sonnenberger
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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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/*
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* Development supported by Google Summer of Code 2008.
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*/
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/*
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* The current implementation is very limited:
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*
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* - No encryption support.
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* - No ZIP64 support.
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* - No support for splitting and spanning.
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* - Only supports regular file and folder entries.
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*
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* Note that generally data in ZIP files is little-endian encoded,
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* with some exceptions.
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*
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* TODO: Since Libarchive is generally 64bit oriented, but this implementation
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* does not yet support sizes exceeding 32bit, it is highly fragile for
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* big archives. This should change when ZIP64 is finally implemented, otherwise
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* some serious checking has to be done.
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*
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*/
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#include "archive_platform.h"
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__FBSDID("$FreeBSD$");
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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#include <stdio.h>
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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_ZLIB_H
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#include <zlib.h>
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#endif
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#include "archive.h"
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#include "archive_endian.h"
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#include "archive_entry.h"
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#include "archive_private.h"
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#include "archive_write_private.h"
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#ifndef HAVE_ZLIB_H
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#include "archive_crc32.h"
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#endif
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#define ZIP_SIGNATURE_LOCAL_FILE_HEADER 0x04034b50
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#define ZIP_SIGNATURE_DATA_DESCRIPTOR 0x08074b50
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#define ZIP_SIGNATURE_FILE_HEADER 0x02014b50
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#define ZIP_SIGNATURE_CENTRAL_DIRECTORY_END 0x06054b50
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#define ZIP_SIGNATURE_EXTRA_TIMESTAMP 0x5455
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#define ZIP_SIGNATURE_EXTRA_UNIX 0x7855
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#define ZIP_VERSION_EXTRACT 0x0014 /* ZIP version 2.0 is needed. */
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#define ZIP_VERSION_BY 0x0314 /* Made by UNIX, using ZIP version 2.0. */
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#define ZIP_FLAGS 0x08 /* Flagging bit 3 (count from 0) for using data descriptor. */
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enum compression {
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COMPRESSION_STORE = 0
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#ifdef HAVE_ZLIB_H
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,
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COMPRESSION_DEFLATE = 8
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#endif
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};
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static ssize_t archive_write_zip_data(struct archive_write *, const void *buff, size_t s);
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static int archive_write_zip_finish(struct archive_write *);
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static int archive_write_zip_destroy(struct archive_write *);
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static int archive_write_zip_finish_entry(struct archive_write *);
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static int archive_write_zip_header(struct archive_write *, struct archive_entry *);
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static unsigned int dos_time(const time_t);
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static size_t path_length(struct archive_entry *);
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static int write_path(struct archive_entry *, struct archive_write *);
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struct zip_local_file_header {
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char signature[4];
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char version[2];
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char flags[2];
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char compression[2];
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char timedate[4];
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char crc32[4];
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char compressed_size[4];
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char uncompressed_size[4];
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char filename_length[2];
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char extra_length[2];
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};
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struct zip_file_header {
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char signature[4];
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char version_by[2];
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char version_extract[2];
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char flags[2];
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char compression[2];
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char timedate[4];
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char crc32[4];
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char compressed_size[4];
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char uncompressed_size[4];
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char filename_length[2];
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char extra_length[2];
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char comment_length[2];
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char disk_number[2];
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char attributes_internal[2];
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char attributes_external[4];
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char offset[4];
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};
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struct zip_data_descriptor {
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char signature[4]; /* Not mandatory, but recommended by specification. */
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char crc32[4];
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char compressed_size[4];
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char uncompressed_size[4];
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};
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struct zip_extra_data_local {
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char time_id[2];
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char time_size[2];
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char time_flag[1];
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char mtime[4];
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char atime[4];
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char ctime[4];
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char unix_id[2];
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char unix_size[2];
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char unix_uid[2];
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char unix_gid[2];
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};
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struct zip_extra_data_central {
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char time_id[2];
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char time_size[2];
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char time_flag[1];
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char mtime[4];
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char unix_id[2];
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char unix_size[2];
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};
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struct zip_file_header_link {
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struct zip_file_header_link *next;
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struct archive_entry *entry;
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off_t offset;
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unsigned long crc32;
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off_t compressed_size;
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enum compression compression;
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};
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struct zip {
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struct zip_data_descriptor data_descriptor;
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struct zip_file_header_link *central_directory;
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struct zip_file_header_link *central_directory_end;
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int64_t offset;
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int64_t written_bytes;
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int64_t remaining_data_bytes;
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enum compression compression;
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#ifdef HAVE_ZLIB_H
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z_stream stream;
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size_t len_buf;
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unsigned char *buf;
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#endif
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};
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struct zip_central_directory_end {
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char signature[4];
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char disk[2];
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char start_disk[2];
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char entries_disk[2];
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char entries[2];
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char size[4];
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char offset[4];
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char comment_length[2];
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};
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static int
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archive_write_zip_options(struct archive_write *a, const char *key,
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const char *value)
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{
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struct zip *zip = a->format_data;
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if (strcmp(key, "compression") == 0) {
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if (strcmp(value, "deflate") == 0) {
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#ifdef HAVE_ZLIB_H
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zip->compression = COMPRESSION_DEFLATE;
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#else
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archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
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"deflate compression not supported");
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return ARCHIVE_WARN;
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#endif
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} else if (strcmp(value, "store") == 0)
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zip->compression = COMPRESSION_STORE;
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else
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return (ARCHIVE_WARN);
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return (ARCHIVE_OK);
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}
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return (ARCHIVE_WARN);
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}
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int
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archive_write_set_format_zip(struct archive *_a)
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{
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struct archive_write *a = (struct archive_write *)_a;
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struct zip *zip;
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/* If another format was already registered, unregister it. */
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if (a->format_destroy != NULL)
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(a->format_destroy)(a);
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zip = (struct zip *) calloc(1, sizeof(*zip));
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if (zip == NULL) {
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archive_set_error(&a->archive, ENOMEM, "Can't allocate zip data");
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return (ARCHIVE_FATAL);
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}
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zip->central_directory = NULL;
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zip->central_directory_end = NULL;
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zip->offset = 0;
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zip->written_bytes = 0;
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zip->remaining_data_bytes = 0;
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#ifdef HAVE_ZLIB_H
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zip->compression = COMPRESSION_DEFLATE;
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zip->len_buf = 65536;
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zip->buf = malloc(zip->len_buf);
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if (zip->buf == NULL) {
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archive_set_error(&a->archive, ENOMEM, "Can't allocate compression buffer");
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return (ARCHIVE_FATAL);
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}
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#else
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zip->compression = COMPRESSION_STORE;
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#endif
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a->format_data = zip;
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a->pad_uncompressed = 0; /* Actually not needed for now, since no compression support yet. */
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a->format_name = "zip";
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a->format_options = archive_write_zip_options;
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a->format_write_header = archive_write_zip_header;
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a->format_write_data = archive_write_zip_data;
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a->format_finish_entry = archive_write_zip_finish_entry;
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a->format_finish = archive_write_zip_finish;
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a->format_destroy = archive_write_zip_destroy;
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a->archive.archive_format = ARCHIVE_FORMAT_ZIP;
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a->archive.archive_format_name = "ZIP";
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archive_le32enc(&zip->data_descriptor.signature,
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ZIP_SIGNATURE_DATA_DESCRIPTOR);
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return (ARCHIVE_OK);
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}
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static int
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archive_write_zip_header(struct archive_write *a, struct archive_entry *entry)
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{
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struct zip *zip;
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struct zip_local_file_header h;
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struct zip_extra_data_local e;
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struct zip_data_descriptor *d;
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struct zip_file_header_link *l;
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int ret;
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int64_t size;
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mode_t type;
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/* Entries other than a regular file or a folder are skipped. */
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type = archive_entry_filetype(entry);
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if ((type != AE_IFREG) & (type != AE_IFDIR)) {
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archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Filetype not supported");
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return ARCHIVE_FAILED;
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};
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/* Directory entries should have a size of 0. */
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if (type == AE_IFDIR)
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archive_entry_set_size(entry, 0);
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zip = a->format_data;
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d = &zip->data_descriptor;
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size = archive_entry_size(entry);
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zip->remaining_data_bytes = size;
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/* Append archive entry to the central directory data. */
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l = (struct zip_file_header_link *) malloc(sizeof(*l));
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if (l == NULL) {
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archive_set_error(&a->archive, ENOMEM, "Can't allocate zip header data");
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return (ARCHIVE_FATAL);
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}
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l->entry = archive_entry_clone(entry);
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/* Initialize the CRC variable and potentially the local crc32(). */
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l->crc32 = crc32(0, NULL, 0);
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l->compression = zip->compression;
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l->compressed_size = 0;
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l->next = NULL;
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if (zip->central_directory == NULL) {
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zip->central_directory = l;
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} else {
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zip->central_directory_end->next = l;
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}
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zip->central_directory_end = l;
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/* Store the offset of this header for later use in central directory. */
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l->offset = zip->written_bytes;
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memset(&h, 0, sizeof(h));
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archive_le32enc(&h.signature, ZIP_SIGNATURE_LOCAL_FILE_HEADER);
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archive_le16enc(&h.version, ZIP_VERSION_EXTRACT);
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archive_le16enc(&h.flags, ZIP_FLAGS);
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archive_le16enc(&h.compression, zip->compression);
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archive_le32enc(&h.timedate, dos_time(archive_entry_mtime(entry)));
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archive_le16enc(&h.filename_length, (uint16_t)path_length(entry));
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switch (zip->compression) {
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case COMPRESSION_STORE:
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/* Setting compressed and uncompressed sizes even when specification says
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* to set to zero when using data descriptors. Otherwise the end of the
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* data for an entry is rather difficult to find. */
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archive_le32enc(&h.compressed_size, size);
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archive_le32enc(&h.uncompressed_size, size);
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break;
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#ifdef HAVE_ZLIB_H
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case COMPRESSION_DEFLATE:
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archive_le32enc(&h.uncompressed_size, size);
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zip->stream.zalloc = Z_NULL;
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zip->stream.zfree = Z_NULL;
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zip->stream.opaque = Z_NULL;
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zip->stream.next_out = zip->buf;
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zip->stream.avail_out = zip->len_buf;
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if (deflateInit2(&zip->stream, Z_DEFAULT_COMPRESSION, Z_DEFLATED,
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-15, 8, Z_DEFAULT_STRATEGY) != Z_OK) {
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archive_set_error(&a->archive, ENOMEM, "Can't init deflate compressor");
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return (ARCHIVE_FATAL);
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}
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break;
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#endif
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}
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/* Formatting extra data. */
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archive_le16enc(&h.extra_length, sizeof(e));
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archive_le16enc(&e.time_id, ZIP_SIGNATURE_EXTRA_TIMESTAMP);
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archive_le16enc(&e.time_size, sizeof(e.time_flag) +
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sizeof(e.mtime) + sizeof(e.atime) + sizeof(e.ctime));
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e.time_flag[0] = 0x07;
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archive_le32enc(&e.mtime, archive_entry_mtime(entry));
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archive_le32enc(&e.atime, archive_entry_atime(entry));
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archive_le32enc(&e.ctime, archive_entry_ctime(entry));
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archive_le16enc(&e.unix_id, ZIP_SIGNATURE_EXTRA_UNIX);
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archive_le16enc(&e.unix_size, sizeof(e.unix_uid) + sizeof(e.unix_gid));
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archive_le16enc(&e.unix_uid, archive_entry_uid(entry));
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archive_le16enc(&e.unix_gid, archive_entry_gid(entry));
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archive_le32enc(&d->uncompressed_size, size);
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ret = (a->compressor.write)(a, &h, sizeof(h));
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if (ret != ARCHIVE_OK)
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return (ARCHIVE_FATAL);
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zip->written_bytes += sizeof(h);
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ret = write_path(entry, a);
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if (ret <= ARCHIVE_OK)
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return (ARCHIVE_FATAL);
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zip->written_bytes += ret;
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ret = (a->compressor.write)(a, &e, sizeof(e));
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if (ret != ARCHIVE_OK)
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return (ARCHIVE_FATAL);
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zip->written_bytes += sizeof(e);
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return (ARCHIVE_OK);
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}
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static ssize_t
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archive_write_zip_data(struct archive_write *a, const void *buff, size_t s)
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{
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int ret;
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struct zip *zip = a->format_data;
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struct zip_file_header_link *l = zip->central_directory_end;
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if ((int64_t)s > zip->remaining_data_bytes)
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s = (size_t)zip->remaining_data_bytes;
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if (s == 0) return 0;
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switch (zip->compression) {
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case COMPRESSION_STORE:
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ret = (a->compressor.write)(a, buff, s);
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if (ret != ARCHIVE_OK) return (ret);
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zip->written_bytes += s;
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zip->remaining_data_bytes -= s;
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l->compressed_size += s;
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l->crc32 = crc32(l->crc32, buff, s);
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return (s);
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#if HAVE_ZLIB_H
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case COMPRESSION_DEFLATE:
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zip->stream.next_in = (unsigned char*)(uintptr_t)buff;
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zip->stream.avail_in = s;
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do {
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ret = deflate(&zip->stream, Z_NO_FLUSH);
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if (ret == Z_STREAM_ERROR)
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return (ARCHIVE_FATAL);
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if (zip->stream.avail_out == 0) {
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ret = (a->compressor.write)(a, zip->buf, zip->len_buf);
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if (ret != ARCHIVE_OK)
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return (ret);
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l->compressed_size += zip->len_buf;
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zip->written_bytes += zip->len_buf;
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zip->stream.next_out = zip->buf;
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zip->stream.avail_out = zip->len_buf;
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}
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} while (zip->stream.avail_in != 0);
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zip->remaining_data_bytes -= s;
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/* If we have it, use zlib's fast crc32() */
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l->crc32 = crc32(l->crc32, buff, s);
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return (s);
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#endif
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default:
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archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
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"Invalid ZIP compression type");
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return ARCHIVE_FATAL;
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}
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}
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static int
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archive_write_zip_finish_entry(struct archive_write *a)
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{
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/* Write the data descripter after file data has been written. */
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int ret;
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struct zip *zip = a->format_data;
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struct zip_data_descriptor *d = &zip->data_descriptor;
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struct zip_file_header_link *l = zip->central_directory_end;
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#if HAVE_ZLIB_H
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size_t reminder;
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#endif
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switch(zip->compression) {
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case COMPRESSION_STORE:
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break;
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#if HAVE_ZLIB_H
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case COMPRESSION_DEFLATE:
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for (;;) {
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ret = deflate(&zip->stream, Z_FINISH);
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if (ret == Z_STREAM_ERROR)
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return (ARCHIVE_FATAL);
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reminder = zip->len_buf - zip->stream.avail_out;
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ret = (a->compressor.write)(a, zip->buf, reminder);
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if (ret != ARCHIVE_OK)
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return (ret);
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l->compressed_size += reminder;
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zip->written_bytes += reminder;
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zip->stream.next_out = zip->buf;
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if (zip->stream.avail_out != 0)
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break;
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zip->stream.avail_out = zip->len_buf;
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}
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deflateEnd(&zip->stream);
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break;
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#endif
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}
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archive_le32enc(&d->crc32, l->crc32);
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archive_le32enc(&d->compressed_size, l->compressed_size);
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ret = (a->compressor.write)(a, d, sizeof(*d));
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if (ret != ARCHIVE_OK)
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return (ARCHIVE_FATAL);
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zip->written_bytes += sizeof(*d);
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return (ARCHIVE_OK);
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}
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static int
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archive_write_zip_finish(struct archive_write *a)
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{
|
|
struct zip *zip;
|
|
struct zip_file_header_link *l;
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struct zip_file_header h;
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|
struct zip_central_directory_end end;
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|
struct zip_extra_data_central e;
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|
off_t offset_start, offset_end;
|
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int entries;
|
|
int ret;
|
|
|
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zip = a->format_data;
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l = zip->central_directory;
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|
|
|
/*
|
|
* Formatting central directory file header fields that are fixed for all entries.
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|
* Fields not used (and therefor 0) are:
|
|
*
|
|
* - comment_length
|
|
* - disk_number
|
|
* - attributes_internal
|
|
*/
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|
memset(&h, 0, sizeof(h));
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|
archive_le32enc(&h.signature, ZIP_SIGNATURE_FILE_HEADER);
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archive_le16enc(&h.version_by, ZIP_VERSION_BY);
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archive_le16enc(&h.version_extract, ZIP_VERSION_EXTRACT);
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archive_le16enc(&h.flags, ZIP_FLAGS);
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|
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entries = 0;
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offset_start = zip->written_bytes;
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|
|
|
/* Formatting individual header fields per entry and
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|
* writing each entry. */
|
|
while (l != NULL) {
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|
archive_le16enc(&h.compression, l->compression);
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|
archive_le32enc(&h.timedate, dos_time(archive_entry_mtime(l->entry)));
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|
archive_le32enc(&h.crc32, l->crc32);
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|
archive_le32enc(&h.compressed_size, l->compressed_size);
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|
archive_le32enc(&h.uncompressed_size, archive_entry_size(l->entry));
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|
archive_le16enc(&h.filename_length, (uint16_t)path_length(l->entry));
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|
archive_le16enc(&h.extra_length, sizeof(e));
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|
archive_le16enc(&h.attributes_external[2], archive_entry_mode(l->entry));
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|
archive_le32enc(&h.offset, l->offset);
|
|
|
|
/* Formatting extra data. */
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|
archive_le16enc(&e.time_id, ZIP_SIGNATURE_EXTRA_TIMESTAMP);
|
|
archive_le16enc(&e.time_size, sizeof(e.mtime) + sizeof(e.time_flag));
|
|
e.time_flag[0] = 0x07;
|
|
archive_le32enc(&e.mtime, archive_entry_mtime(l->entry));
|
|
archive_le16enc(&e.unix_id, ZIP_SIGNATURE_EXTRA_UNIX);
|
|
archive_le16enc(&e.unix_size, 0x0000);
|
|
|
|
ret = (a->compressor.write)(a, &h, sizeof(h));
|
|
if (ret != ARCHIVE_OK)
|
|
return (ARCHIVE_FATAL);
|
|
zip->written_bytes += sizeof(h);
|
|
|
|
ret = write_path(l->entry, a);
|
|
if (ret <= ARCHIVE_OK)
|
|
return (ARCHIVE_FATAL);
|
|
zip->written_bytes += ret;
|
|
|
|
ret = (a->compressor.write)(a, &e, sizeof(e));
|
|
if (ret != ARCHIVE_OK)
|
|
return (ARCHIVE_FATAL);
|
|
zip->written_bytes += sizeof(e);
|
|
|
|
l = l->next;
|
|
entries++;
|
|
}
|
|
offset_end = zip->written_bytes;
|
|
|
|
/* Formatting end of central directory. */
|
|
memset(&end, 0, sizeof(end));
|
|
archive_le32enc(&end.signature, ZIP_SIGNATURE_CENTRAL_DIRECTORY_END);
|
|
archive_le16enc(&end.entries_disk, entries);
|
|
archive_le16enc(&end.entries, entries);
|
|
archive_le32enc(&end.size, offset_end - offset_start);
|
|
archive_le32enc(&end.offset, offset_start);
|
|
|
|
/* Writing end of central directory. */
|
|
ret = (a->compressor.write)(a, &end, sizeof(end));
|
|
if (ret != ARCHIVE_OK)
|
|
return (ARCHIVE_FATAL);
|
|
zip->written_bytes += sizeof(end);
|
|
return (ARCHIVE_OK);
|
|
}
|
|
|
|
static int
|
|
archive_write_zip_destroy(struct archive_write *a)
|
|
{
|
|
struct zip *zip;
|
|
struct zip_file_header_link *l;
|
|
|
|
zip = a->format_data;
|
|
while (zip->central_directory != NULL) {
|
|
l = zip->central_directory;
|
|
zip->central_directory = l->next;
|
|
archive_entry_free(l->entry);
|
|
free(l);
|
|
}
|
|
#ifdef HAVE_ZLIB_H
|
|
free(zip->buf);
|
|
#endif
|
|
free(zip);
|
|
a->format_data = NULL;
|
|
return (ARCHIVE_OK);
|
|
}
|
|
|
|
/* Convert into MSDOS-style date/time. */
|
|
static unsigned int
|
|
dos_time(const time_t unix_time)
|
|
{
|
|
struct tm *t;
|
|
unsigned int dt;
|
|
|
|
/* This will not preserve time when creating/extracting the archive
|
|
* on two systems with different time zones. */
|
|
t = localtime(&unix_time);
|
|
|
|
dt = 0;
|
|
dt += ((t->tm_year - 80) & 0x7f) << 9;
|
|
dt += ((t->tm_mon + 1) & 0x0f) << 5;
|
|
dt += (t->tm_mday & 0x1f);
|
|
dt <<= 16;
|
|
dt += (t->tm_hour & 0x1f) << 11;
|
|
dt += (t->tm_min & 0x3f) << 5;
|
|
dt += (t->tm_sec & 0x3e) >> 1; /* Only counting every 2 seconds. */
|
|
return dt;
|
|
}
|
|
|
|
static size_t
|
|
path_length(struct archive_entry *entry)
|
|
{
|
|
mode_t type;
|
|
const char *path;
|
|
|
|
type = archive_entry_filetype(entry);
|
|
path = archive_entry_pathname(entry);
|
|
|
|
if ((type == AE_IFDIR) & (path[strlen(path) - 1] != '/')) {
|
|
return strlen(path) + 1;
|
|
} else {
|
|
return strlen(path);
|
|
}
|
|
}
|
|
|
|
static int
|
|
write_path(struct archive_entry *entry, struct archive_write *archive)
|
|
{
|
|
int ret;
|
|
const char *path;
|
|
mode_t type;
|
|
size_t written_bytes;
|
|
|
|
path = archive_entry_pathname(entry);
|
|
type = archive_entry_filetype(entry);
|
|
written_bytes = 0;
|
|
|
|
ret = (archive->compressor.write)(archive, path, strlen(path));
|
|
if (ret != ARCHIVE_OK)
|
|
return (ARCHIVE_FATAL);
|
|
written_bytes += strlen(path);
|
|
|
|
/* Folders are recognized by a traling slash. */
|
|
if ((type == AE_IFDIR) & (path[strlen(path) - 1] != '/')) {
|
|
ret = (archive->compressor.write)(archive, "/", 1);
|
|
if (ret != ARCHIVE_OK)
|
|
return (ARCHIVE_FATAL);
|
|
written_bytes += 1;
|
|
}
|
|
|
|
return ((int)written_bytes);
|
|
}
|