aboutsummaryrefslogtreecommitdiffstats
path: root/libarchive/archive_write_set_format_zip.c
diff options
context:
space:
mode:
authorMartin Matuska <mm@FreeBSD.org>2011-12-20 22:47:56 +0000
committerMartin Matuska <mm@FreeBSD.org>2011-12-20 22:47:56 +0000
commit35fa5e2f58abd428bff0de1238364880447ef095 (patch)
tree07565a115ca59ea7230cd38e88901b0290750cde /libarchive/archive_write_set_format_zip.c
downloadsrc-35fa5e2f58abd428bff0de1238364880447ef095.tar.gz
src-35fa5e2f58abd428bff0de1238364880447ef095.zip
Vendor import of libarchive (release/2.8, r3824)
Notes
Notes: svn path=/vendor/libarchive/dist/; revision=228753
Diffstat (limited to 'libarchive/archive_write_set_format_zip.c')
-rw-r--r--libarchive/archive_write_set_format_zip.c670
1 files changed, 670 insertions, 0 deletions
diff --git a/libarchive/archive_write_set_format_zip.c b/libarchive/archive_write_set_format_zip.c
new file mode 100644
index 000000000000..201152f3a9e7
--- /dev/null
+++ b/libarchive/archive_write_set_format_zip.c
@@ -0,0 +1,670 @@
+/*-
+ * Copyright (c) 2008 Anselm Strauss
+ * Copyright (c) 2009 Joerg Sonnenberger
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * Development supported by Google Summer of Code 2008.
+ */
+
+/*
+ * The current implementation is very limited:
+ *
+ * - No encryption support.
+ * - No ZIP64 support.
+ * - No support for splitting and spanning.
+ * - Only supports regular file and folder entries.
+ *
+ * Note that generally data in ZIP files is little-endian encoded,
+ * with some exceptions.
+ *
+ * TODO: Since Libarchive is generally 64bit oriented, but this implementation
+ * does not yet support sizes exceeding 32bit, it is highly fragile for
+ * big archives. This should change when ZIP64 is finally implemented, otherwise
+ * some serious checking has to be done.
+ *
+ */
+
+#include "archive_platform.h"
+__FBSDID("$FreeBSD: head/lib/libarchive/archive_write_set_format_zip.c 201168 2009-12-29 06:15:32Z kientzle $");
+
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
+#include <stdio.h>
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+#ifdef HAVE_ZLIB_H
+#include <zlib.h>
+#endif
+
+#include "archive.h"
+#include "archive_endian.h"
+#include "archive_entry.h"
+#include "archive_private.h"
+#include "archive_write_private.h"
+
+#ifndef HAVE_ZLIB_H
+#include "archive_crc32.h"
+#endif
+
+#define ZIP_SIGNATURE_LOCAL_FILE_HEADER 0x04034b50
+#define ZIP_SIGNATURE_DATA_DESCRIPTOR 0x08074b50
+#define ZIP_SIGNATURE_FILE_HEADER 0x02014b50
+#define ZIP_SIGNATURE_CENTRAL_DIRECTORY_END 0x06054b50
+#define ZIP_SIGNATURE_EXTRA_TIMESTAMP 0x5455
+#define ZIP_SIGNATURE_EXTRA_UNIX 0x7855
+#define ZIP_VERSION_EXTRACT 0x0014 /* ZIP version 2.0 is needed. */
+#define ZIP_VERSION_BY 0x0314 /* Made by UNIX, using ZIP version 2.0. */
+#define ZIP_FLAGS 0x08 /* Flagging bit 3 (count from 0) for using data descriptor. */
+
+enum compression {
+ COMPRESSION_STORE = 0
+#ifdef HAVE_ZLIB_H
+ ,
+ COMPRESSION_DEFLATE = 8
+#endif
+};
+
+static ssize_t archive_write_zip_data(struct archive_write *, const void *buff, size_t s);
+static int archive_write_zip_finish(struct archive_write *);
+static int archive_write_zip_destroy(struct archive_write *);
+static int archive_write_zip_finish_entry(struct archive_write *);
+static int archive_write_zip_header(struct archive_write *, struct archive_entry *);
+static unsigned int dos_time(const time_t);
+static size_t path_length(struct archive_entry *);
+static int write_path(struct archive_entry *, struct archive_write *);
+
+struct zip_local_file_header {
+ char signature[4];
+ char version[2];
+ char flags[2];
+ char compression[2];
+ char timedate[4];
+ char crc32[4];
+ char compressed_size[4];
+ char uncompressed_size[4];
+ char filename_length[2];
+ char extra_length[2];
+};
+
+struct zip_file_header {
+ char signature[4];
+ char version_by[2];
+ char version_extract[2];
+ char flags[2];
+ char compression[2];
+ char timedate[4];
+ char crc32[4];
+ char compressed_size[4];
+ char uncompressed_size[4];
+ char filename_length[2];
+ char extra_length[2];
+ char comment_length[2];
+ char disk_number[2];
+ char attributes_internal[2];
+ char attributes_external[4];
+ char offset[4];
+};
+
+struct zip_data_descriptor {
+ char signature[4]; /* Not mandatory, but recommended by specification. */
+ char crc32[4];
+ char compressed_size[4];
+ char uncompressed_size[4];
+};
+
+struct zip_extra_data_local {
+ char time_id[2];
+ char time_size[2];
+ char time_flag[1];
+ char mtime[4];
+ char atime[4];
+ char ctime[4];
+ char unix_id[2];
+ char unix_size[2];
+ char unix_uid[2];
+ char unix_gid[2];
+};
+
+struct zip_extra_data_central {
+ char time_id[2];
+ char time_size[2];
+ char time_flag[1];
+ char mtime[4];
+ char unix_id[2];
+ char unix_size[2];
+};
+
+struct zip_file_header_link {
+ struct zip_file_header_link *next;
+ struct archive_entry *entry;
+ off_t offset;
+ unsigned long crc32;
+ off_t compressed_size;
+ enum compression compression;
+};
+
+struct zip {
+ struct zip_data_descriptor data_descriptor;
+ struct zip_file_header_link *central_directory;
+ struct zip_file_header_link *central_directory_end;
+ int64_t offset;
+ int64_t written_bytes;
+ int64_t remaining_data_bytes;
+ enum compression compression;
+
+#ifdef HAVE_ZLIB_H
+ z_stream stream;
+ size_t len_buf;
+ unsigned char *buf;
+#endif
+};
+
+struct zip_central_directory_end {
+ char signature[4];
+ char disk[2];
+ char start_disk[2];
+ char entries_disk[2];
+ char entries[2];
+ char size[4];
+ char offset[4];
+ char comment_length[2];
+};
+
+static int
+archive_write_zip_options(struct archive_write *a, const char *key,
+ const char *value)
+{
+ struct zip *zip = a->format_data;
+
+ if (strcmp(key, "compression") == 0) {
+ if (strcmp(value, "deflate") == 0) {
+#ifdef HAVE_ZLIB_H
+ zip->compression = COMPRESSION_DEFLATE;
+#else
+ archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
+ "deflate compression not supported");
+ return ARCHIVE_WARN;
+#endif
+ } else if (strcmp(value, "store") == 0)
+ zip->compression = COMPRESSION_STORE;
+ else
+ return (ARCHIVE_WARN);
+ return (ARCHIVE_OK);
+ }
+ return (ARCHIVE_WARN);
+}
+
+int
+archive_write_set_format_zip(struct archive *_a)
+{
+ struct archive_write *a = (struct archive_write *)_a;
+ struct zip *zip;
+
+ /* If another format was already registered, unregister it. */
+ if (a->format_destroy != NULL)
+ (a->format_destroy)(a);
+
+ zip = (struct zip *) calloc(1, sizeof(*zip));
+ if (zip == NULL) {
+ archive_set_error(&a->archive, ENOMEM, "Can't allocate zip data");
+ return (ARCHIVE_FATAL);
+ }
+ zip->central_directory = NULL;
+ zip->central_directory_end = NULL;
+ zip->offset = 0;
+ zip->written_bytes = 0;
+ zip->remaining_data_bytes = 0;
+
+#ifdef HAVE_ZLIB_H
+ zip->compression = COMPRESSION_DEFLATE;
+ zip->len_buf = 65536;
+ zip->buf = malloc(zip->len_buf);
+ if (zip->buf == NULL) {
+ archive_set_error(&a->archive, ENOMEM, "Can't allocate compression buffer");
+ return (ARCHIVE_FATAL);
+ }
+#else
+ zip->compression = COMPRESSION_STORE;
+#endif
+
+ a->format_data = zip;
+
+ a->pad_uncompressed = 0; /* Actually not needed for now, since no compression support yet. */
+ a->format_name = "zip";
+ a->format_options = archive_write_zip_options;
+ a->format_write_header = archive_write_zip_header;
+ a->format_write_data = archive_write_zip_data;
+ a->format_finish_entry = archive_write_zip_finish_entry;
+ a->format_finish = archive_write_zip_finish;
+ a->format_destroy = archive_write_zip_destroy;
+ a->archive.archive_format = ARCHIVE_FORMAT_ZIP;
+ a->archive.archive_format_name = "ZIP";
+
+ archive_le32enc(&zip->data_descriptor.signature,
+ ZIP_SIGNATURE_DATA_DESCRIPTOR);
+
+ return (ARCHIVE_OK);
+}
+
+static int
+archive_write_zip_header(struct archive_write *a, struct archive_entry *entry)
+{
+ struct zip *zip;
+ struct zip_local_file_header h;
+ struct zip_extra_data_local e;
+ struct zip_data_descriptor *d;
+ struct zip_file_header_link *l;
+ int ret;
+ int64_t size;
+ mode_t type;
+
+ /* Entries other than a regular file or a folder are skipped. */
+ type = archive_entry_filetype(entry);
+ if ((type != AE_IFREG) & (type != AE_IFDIR)) {
+ archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Filetype not supported");
+ return ARCHIVE_FAILED;
+ };
+
+ /* Directory entries should have a size of 0. */
+ if (type == AE_IFDIR)
+ archive_entry_set_size(entry, 0);
+
+ zip = a->format_data;
+ d = &zip->data_descriptor;
+ size = archive_entry_size(entry);
+ zip->remaining_data_bytes = size;
+
+ /* Append archive entry to the central directory data. */
+ l = (struct zip_file_header_link *) malloc(sizeof(*l));
+ if (l == NULL) {
+ archive_set_error(&a->archive, ENOMEM, "Can't allocate zip header data");
+ return (ARCHIVE_FATAL);
+ }
+ l->entry = archive_entry_clone(entry);
+ /* Initialize the CRC variable and potentially the local crc32(). */
+ l->crc32 = crc32(0, NULL, 0);
+ l->compression = zip->compression;
+ l->compressed_size = 0;
+ l->next = NULL;
+ if (zip->central_directory == NULL) {
+ zip->central_directory = l;
+ } else {
+ zip->central_directory_end->next = l;
+ }
+ zip->central_directory_end = l;
+
+ /* Store the offset of this header for later use in central directory. */
+ l->offset = zip->written_bytes;
+
+ memset(&h, 0, sizeof(h));
+ archive_le32enc(&h.signature, ZIP_SIGNATURE_LOCAL_FILE_HEADER);
+ archive_le16enc(&h.version, ZIP_VERSION_EXTRACT);
+ archive_le16enc(&h.flags, ZIP_FLAGS);
+ archive_le16enc(&h.compression, zip->compression);
+ archive_le32enc(&h.timedate, dos_time(archive_entry_mtime(entry)));
+ archive_le16enc(&h.filename_length, (uint16_t)path_length(entry));
+
+ switch (zip->compression) {
+ case COMPRESSION_STORE:
+ /* Setting compressed and uncompressed sizes even when specification says
+ * to set to zero when using data descriptors. Otherwise the end of the
+ * data for an entry is rather difficult to find. */
+ archive_le32enc(&h.compressed_size, size);
+ archive_le32enc(&h.uncompressed_size, size);
+ break;
+#ifdef HAVE_ZLIB_H
+ case COMPRESSION_DEFLATE:
+ archive_le32enc(&h.uncompressed_size, size);
+
+ zip->stream.zalloc = Z_NULL;
+ zip->stream.zfree = Z_NULL;
+ zip->stream.opaque = Z_NULL;
+ zip->stream.next_out = zip->buf;
+ zip->stream.avail_out = zip->len_buf;
+ if (deflateInit2(&zip->stream, Z_DEFAULT_COMPRESSION, Z_DEFLATED,
+ -15, 8, Z_DEFAULT_STRATEGY) != Z_OK) {
+ archive_set_error(&a->archive, ENOMEM, "Can't init deflate compressor");
+ return (ARCHIVE_FATAL);
+ }
+ break;
+#endif
+ }
+
+ /* Formatting extra data. */
+ archive_le16enc(&h.extra_length, sizeof(e));
+ archive_le16enc(&e.time_id, ZIP_SIGNATURE_EXTRA_TIMESTAMP);
+ archive_le16enc(&e.time_size, sizeof(e.time_flag) +
+ sizeof(e.mtime) + sizeof(e.atime) + sizeof(e.ctime));
+ e.time_flag[0] = 0x07;
+ archive_le32enc(&e.mtime, archive_entry_mtime(entry));
+ archive_le32enc(&e.atime, archive_entry_atime(entry));
+ archive_le32enc(&e.ctime, archive_entry_ctime(entry));
+
+ archive_le16enc(&e.unix_id, ZIP_SIGNATURE_EXTRA_UNIX);
+ archive_le16enc(&e.unix_size, sizeof(e.unix_uid) + sizeof(e.unix_gid));
+ archive_le16enc(&e.unix_uid, archive_entry_uid(entry));
+ archive_le16enc(&e.unix_gid, archive_entry_gid(entry));
+
+ archive_le32enc(&d->uncompressed_size, size);
+
+ ret = (a->compressor.write)(a, &h, sizeof(h));
+ if (ret != ARCHIVE_OK)
+ return (ARCHIVE_FATAL);
+ zip->written_bytes += sizeof(h);
+
+ ret = write_path(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);
+
+ return (ARCHIVE_OK);
+}
+
+static ssize_t
+archive_write_zip_data(struct archive_write *a, const void *buff, size_t s)
+{
+ int ret;
+ struct zip *zip = a->format_data;
+ struct zip_file_header_link *l = zip->central_directory_end;
+
+ if ((int64_t)s > zip->remaining_data_bytes)
+ s = (size_t)zip->remaining_data_bytes;
+
+ if (s == 0) return 0;
+
+ switch (zip->compression) {
+ case COMPRESSION_STORE:
+ ret = (a->compressor.write)(a, buff, s);
+ if (ret != ARCHIVE_OK) return (ret);
+ zip->written_bytes += s;
+ zip->remaining_data_bytes -= s;
+ l->compressed_size += s;
+ l->crc32 = crc32(l->crc32, buff, s);
+ return (s);
+#if HAVE_ZLIB_H
+ case COMPRESSION_DEFLATE:
+ zip->stream.next_in = (unsigned char*)(uintptr_t)buff;
+ zip->stream.avail_in = s;
+ do {
+ ret = deflate(&zip->stream, Z_NO_FLUSH);
+ if (ret == Z_STREAM_ERROR)
+ return (ARCHIVE_FATAL);
+ if (zip->stream.avail_out == 0) {
+ ret = (a->compressor.write)(a, zip->buf, zip->len_buf);
+ if (ret != ARCHIVE_OK)
+ return (ret);
+ l->compressed_size += zip->len_buf;
+ zip->written_bytes += zip->len_buf;
+ zip->stream.next_out = zip->buf;
+ zip->stream.avail_out = zip->len_buf;
+ }
+ } while (zip->stream.avail_in != 0);
+ zip->remaining_data_bytes -= s;
+ /* If we have it, use zlib's fast crc32() */
+ l->crc32 = crc32(l->crc32, buff, s);
+ return (s);
+#endif
+
+ default:
+ archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
+ "Invalid ZIP compression type");
+ return ARCHIVE_FATAL;
+ }
+}
+
+static int
+archive_write_zip_finish_entry(struct archive_write *a)
+{
+ /* Write the data descripter after file data has been written. */
+ int ret;
+ struct zip *zip = a->format_data;
+ struct zip_data_descriptor *d = &zip->data_descriptor;
+ struct zip_file_header_link *l = zip->central_directory_end;
+#if HAVE_ZLIB_H
+ size_t reminder;
+#endif
+
+ switch(zip->compression) {
+ case COMPRESSION_STORE:
+ break;
+#if HAVE_ZLIB_H
+ case COMPRESSION_DEFLATE:
+ for (;;) {
+ ret = deflate(&zip->stream, Z_FINISH);
+ if (ret == Z_STREAM_ERROR)
+ return (ARCHIVE_FATAL);
+ reminder = zip->len_buf - zip->stream.avail_out;
+ ret = (a->compressor.write)(a, zip->buf, reminder);
+ if (ret != ARCHIVE_OK)
+ return (ret);
+ l->compressed_size += reminder;
+ zip->written_bytes += reminder;
+ zip->stream.next_out = zip->buf;
+ if (zip->stream.avail_out != 0)
+ break;
+ zip->stream.avail_out = zip->len_buf;
+ }
+ deflateEnd(&zip->stream);
+ break;
+#endif
+ }
+
+ archive_le32enc(&d->crc32, l->crc32);
+ archive_le32enc(&d->compressed_size, l->compressed_size);
+ ret = (a->compressor.write)(a, d, sizeof(*d));
+ if (ret != ARCHIVE_OK)
+ return (ARCHIVE_FATAL);
+ zip->written_bytes += sizeof(*d);
+ return (ARCHIVE_OK);
+}
+
+static int
+archive_write_zip_finish(struct archive_write *a)
+{
+ struct zip *zip;
+ struct zip_file_header_link *l;
+ struct zip_file_header h;
+ struct zip_central_directory_end end;
+ struct zip_extra_data_central e;
+ off_t offset_start, offset_end;
+ int entries;
+ int ret;
+
+ if (a->compressor.write == NULL)
+ return (ARCHIVE_OK);
+
+ zip = a->format_data;
+ l = zip->central_directory;
+
+ /*
+ * Formatting central directory file header fields that are fixed for all entries.
+ * Fields not used (and therefor 0) are:
+ *
+ * - comment_length
+ * - disk_number
+ * - attributes_internal
+ */
+ memset(&h, 0, sizeof(h));
+ archive_le32enc(&h.signature, ZIP_SIGNATURE_FILE_HEADER);
+ archive_le16enc(&h.version_by, ZIP_VERSION_BY);
+ archive_le16enc(&h.version_extract, ZIP_VERSION_EXTRACT);
+ archive_le16enc(&h.flags, ZIP_FLAGS);
+
+ entries = 0;
+ offset_start = zip->written_bytes;
+
+ /* Formatting individual header fields per entry and
+ * writing each entry. */
+ while (l != NULL) {
+ archive_le16enc(&h.compression, l->compression);
+ archive_le32enc(&h.timedate, dos_time(archive_entry_mtime(l->entry)));
+ archive_le32enc(&h.crc32, l->crc32);
+ archive_le32enc(&h.compressed_size, l->compressed_size);
+ archive_le32enc(&h.uncompressed_size, archive_entry_size(l->entry));
+ archive_le16enc(&h.filename_length, (uint16_t)path_length(l->entry));
+ archive_le16enc(&h.extra_length, sizeof(e));
+ archive_le16enc(&h.attributes_external[2], archive_entry_mode(l->entry));
+ archive_le32enc(&h.offset, l->offset);
+
+ /* Formatting extra data. */
+ 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);
+}