text: /*-
   * Copyright (c) 2003-2007 Tim Kientzle
   * Copyright (c) 2011-2012 Michihiro NAKAJIMA
   * 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.
   */
  
  #include "archive_platform.h"
  __FBSDID("$FreeBSD: head/lib/libarchive/archive_write_set_format_ustar.c 191579 2009-04-27 18:35:03Z 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
  
  #include "archive.h"
  #include "archive_entry.h"
  #include "archive_entry_locale.h"
  #include "archive_private.h"
  #include "archive_write_private.h"
  #include "archive_write_set_format_private.h"
  
  struct ustar {
  	uint64_t	entry_bytes_remaining;
  	uint64_t	entry_padding;
  
  	struct archive_string_conv *opt_sconv;
  	struct archive_string_conv *sconv_default;
  	int	init_default_conversion;
  };
  
  /*
   * Define structure of POSIX 'ustar' tar header.
   */
  #define	USTAR_name_offset 0
  #define	USTAR_name_size 100
  #define	USTAR_mode_offset 100
  #define	USTAR_mode_size 6
  #define	USTAR_mode_max_size 8
  #define	USTAR_uid_offset 108
  #define	USTAR_uid_size 6
  #define	USTAR_uid_max_size 8
  #define	USTAR_gid_offset 116
  #define	USTAR_gid_size 6
  #define	USTAR_gid_max_size 8
  #define	USTAR_size_offset 124
  #define	USTAR_size_size 11
  #define	USTAR_size_max_size 12
  #define	USTAR_mtime_offset 136
  #define	USTAR_mtime_size 11
  #define	USTAR_mtime_max_size 11
  #define	USTAR_checksum_offset 148
  #define	USTAR_checksum_size 8
  #define	USTAR_typeflag_offset 156
  #define	USTAR_typeflag_size 1
  #define	USTAR_linkname_offset 157
  #define	USTAR_linkname_size 100
  #define	USTAR_magic_offset 257
  #define	USTAR_magic_size 6
  #define	USTAR_version_offset 263
  #define	USTAR_version_size 2
  #define	USTAR_uname_offset 265
  #define	USTAR_uname_size 32
  #define	USTAR_gname_offset 297
  #define	USTAR_gname_size 32
  #define	USTAR_rdevmajor_offset 329
  #define	USTAR_rdevmajor_size 6
  #define	USTAR_rdevmajor_max_size 8
  #define	USTAR_rdevminor_offset 337
  #define	USTAR_rdevminor_size 6
  #define	USTAR_rdevminor_max_size 8
  #define	USTAR_prefix_offset 345
  #define	USTAR_prefix_size 155
  #define	USTAR_padding_offset 500
  #define	USTAR_padding_size 12
  
  /*
   * A filled-in copy of the header for initialization.
   */
  static const char template_header[] = {
  	/* name: 100 bytes */
  	0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
  	0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
  	0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
  	0,0,0,0,
  	/* Mode, space-null termination: 8 bytes */
  	'0','0','0','0','0','0', ' ','\0',
  	/* uid, space-null termination: 8 bytes */
  	'0','0','0','0','0','0', ' ','\0',
  	/* gid, space-null termination: 8 bytes */
  	'0','0','0','0','0','0', ' ','\0',
  	/* size, space termination: 12 bytes */
  	'0','0','0','0','0','0','0','0','0','0','0', ' ',
  	/* mtime, space termination: 12 bytes */
  	'0','0','0','0','0','0','0','0','0','0','0', ' ',
  	/* Initial checksum value: 8 spaces */
  	' ',' ',' ',' ',' ',' ',' ',' ',
  	/* Typeflag: 1 byte */
  	'0',			/* '0' = regular file */
  	/* Linkname: 100 bytes */
  	0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
  	0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
  	0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
  	0,0,0,0,
  	/* Magic: 6 bytes, Version: 2 bytes */
  	'u','s','t','a','r','\0', '0','0',
  	/* Uname: 32 bytes */
  	0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
  	/* Gname: 32 bytes */
  	0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
  	/* rdevmajor + space/null padding: 8 bytes */
  	'0','0','0','0','0','0', ' ','\0',
  	/* rdevminor + space/null padding: 8 bytes */
  	'0','0','0','0','0','0', ' ','\0',
  	/* Prefix: 155 bytes */
  	0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
  	0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
  	0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
  	0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
  	0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,
  	/* Padding: 12 bytes */
  	0,0,0,0,0,0,0,0, 0,0,0,0
  };
  
  static ssize_t	archive_write_ustar_data(struct archive_write *a, const void *buff,
  		    size_t s);
  static int	archive_write_ustar_free(struct archive_write *);
  static int	archive_write_ustar_close(struct archive_write *);
  static int	archive_write_ustar_finish_entry(struct archive_write *);
  static int	archive_write_ustar_header(struct archive_write *,
  		    struct archive_entry *entry);
  static int	archive_write_ustar_options(struct archive_write *,
  		    const char *, const char *);
  static int	format_256(int64_t, char *, int);
  static int	format_number(int64_t, char *, int size, int max, int strict);
  static int	format_octal(int64_t, char *, int);
  
  /*
   * Set output format to 'ustar' format.
   */
  int
  archive_write_set_format_ustar(struct archive *_a)
  {
  	struct archive_write *a = (struct archive_write *)_a;
  	struct ustar *ustar;
  
  	archive_check_magic(_a, ARCHIVE_WRITE_MAGIC,
  	    ARCHIVE_STATE_NEW, "archive_write_set_format_ustar");
  
  	/* If someone else was already registered, unregister them. */
  	if (a->format_free != NULL)
  		(a->format_free)(a);
  
  	/* Basic internal sanity test. */
  	if (sizeof(template_header) != 512) {
  		archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
  		    "Internal: template_header wrong size: %zu should be 512",
  		    sizeof(template_header));
  		return (ARCHIVE_FATAL);
  	}
  
  	ustar = (struct ustar *)calloc(1, sizeof(*ustar));
  	if (ustar == NULL) {
  		archive_set_error(&a->archive, ENOMEM,
  		    "Can't allocate ustar data");
  		return (ARCHIVE_FATAL);
  	}
  	a->format_data = ustar;
  	a->format_name = "ustar";
  	a->format_options = archive_write_ustar_options;
  	a->format_write_header = archive_write_ustar_header;
  	a->format_write_data = archive_write_ustar_data;
  	a->format_close = archive_write_ustar_close;
  	a->format_free = archive_write_ustar_free;
  	a->format_finish_entry = archive_write_ustar_finish_entry;
  	a->archive.archive_format = ARCHIVE_FORMAT_TAR_USTAR;
  	a->archive.archive_format_name = "POSIX ustar";
  	return (ARCHIVE_OK);
  }
  
  static int
  archive_write_ustar_options(struct archive_write *a, const char *key,
      const char *val)
  {
  	struct ustar *ustar = (struct ustar *)a->format_data;
  	int ret = ARCHIVE_FAILED;
  
  	if (strcmp(key, "hdrcharset")  == 0) {
  		if (val == NULL || val[0] == 0)
  			archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
  			    "%s: hdrcharset option needs a character-set name",
  			    a->format_name);
  		else {
  			ustar->opt_sconv = archive_string_conversion_to_charset(
  			    &a->archive, val, 0);
  			if (ustar->opt_sconv != NULL)
  				ret = ARCHIVE_OK;
  			else
  				ret = ARCHIVE_FATAL;
  		}
  		return (ret);
  	}
  
  	/* Note: The "warn" return is just to inform the options
  	 * supervisor that we didn't handle it.  It will generate
  	 * a suitable error if no one used this option. */
  	return (ARCHIVE_WARN);
  }
  
  static int
  archive_write_ustar_header(struct archive_write *a, struct archive_entry *entry)
  {
  	char buff[512];
  	int ret, ret2;
  	struct ustar *ustar;
  	struct archive_entry *entry_main;
  	struct archive_string_conv *sconv;
  
  	ustar = (struct ustar *)a->format_data;
  
  	/* Setup default string conversion. */
  	if (ustar->opt_sconv == NULL) {
  		if (!ustar->init_default_conversion) {
  			ustar->sconv_default =
  			    archive_string_default_conversion_for_write(&(a->archive));
  			ustar->init_default_conversion = 1;
  		}
  		sconv = ustar->sconv_default;
  	} else
  		sconv = ustar->opt_sconv;
  
  	/* Sanity check. */
  	if (archive_entry_pathname(entry) == NULL) {
  		archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
  		    "Can't record entry in tar file without pathname");
  		return (ARCHIVE_FAILED);
  	}
  
  	/* Only regular files (not hardlinks) have data. */
  	if (archive_entry_hardlink(entry) != NULL ||
  	    archive_entry_symlink(entry) != NULL ||
  	    !(archive_entry_filetype(entry) == AE_IFREG))
  		archive_entry_set_size(entry, 0);
  
  	if (AE_IFDIR == archive_entry_filetype(entry)) {
  		const char *p;
  		size_t path_length;
  		/*
  		 * Ensure a trailing '/'.  Modify the entry so
  		 * the client sees the change.
  		 */
  #if defined(_WIN32) && !defined(__CYGWIN__)
  		const wchar_t *wp;
  
  		wp = archive_entry_pathname_w(entry);
  		if (wp != NULL && wp[wcslen(wp) -1] != L'/') {
  			struct archive_wstring ws;
  
  			archive_string_init(&ws);
  			path_length = wcslen(wp);
  			if (archive_wstring_ensure(&ws,
  			    path_length + 2) == NULL) {
  				archive_set_error(&a->archive, ENOMEM,
  				    "Can't allocate ustar data");
  				archive_wstring_free(&ws);
  				return(ARCHIVE_FATAL);
  			}
  			/* Should we keep '\' ? */
  			if (wp[path_length -1] == L'\\')
  				path_length--;
  			archive_wstrncpy(&ws, wp, path_length);
  			archive_wstrappend_wchar(&ws, L'/');
  			archive_entry_copy_pathname_w(entry, ws.s);
  			archive_wstring_free(&ws);
  			p = NULL;
  		} else
  #endif
  			p = archive_entry_pathname(entry);
  		/*
  		 * On Windows, this is a backup operation just in
  		 * case getting WCS failed. On POSIX, this is a
  		 * normal operation.
  		 */
  		if (p != NULL && p[0] != '\0' && p[strlen(p) - 1] != '/') {
  			struct archive_string as;
  
  			archive_string_init(&as);
  			path_length = strlen(p);
  			if (archive_string_ensure(&as,
  			    path_length + 2) == NULL) {
  				archive_set_error(&a->archive, ENOMEM,
  				    "Can't allocate ustar data");
  				archive_string_free(&as);
  				return(ARCHIVE_FATAL);
  			}
  #if defined(_WIN32) && !defined(__CYGWIN__)
  			/* NOTE: This might break the pathname
  			 * if the current code page is CP932 and
  			 * the pathname includes a character '\'
  			 * as a part of its multibyte pathname. */
  			if (p[strlen(p) -1] == '\\')
  				path_length--;
  			else
  #endif
  			archive_strncpy(&as, p, path_length);
  			archive_strappend_char(&as, '/');
  			archive_entry_copy_pathname(entry, as.s);
  			archive_string_free(&as);
  		}
  	}
  
  #if defined(_WIN32) && !defined(__CYGWIN__)
  	/* Make sure the path separators in pathname, hardlink and symlink
  	 * are all slash '/', not the Windows path separator '\'. */
  	entry_main = __la_win_entry_in_posix_pathseparator(entry);
  	if (entry_main == NULL) {
  		archive_set_error(&a->archive, ENOMEM,
  		    "Can't allocate ustar data");
  		return(ARCHIVE_FATAL);
  	}
  	if (entry != entry_main)
  		entry = entry_main;
  	else
  		entry_main = NULL;
  #else
  	entry_main = NULL;
  #endif
  	ret = __archive_write_format_header_ustar(a, buff, entry, -1, 1, sconv);
  	if (ret < ARCHIVE_WARN) {
  		archive_entry_free(entry_main);
  		return (ret);
  	}
  	ret2 = __archive_write_output(a, buff, 512);
  	if (ret2 < ARCHIVE_WARN) {
  		archive_entry_free(entry_main);
  		return (ret2);
  	}
  	if (ret2 < ret)
  		ret = ret2;
  
  	ustar->entry_bytes_remaining = archive_entry_size(entry);
  	ustar->entry_padding = 0x1ff & (-(int64_t)ustar->entry_bytes_remaining);
  	archive_entry_free(entry_main);
  	return (ret);
  }
  
  /*
   * Format a basic 512-byte "ustar" header.
   *
   * Returns -1 if format failed (due to field overflow).
   * Note that this always formats as much of the header as possible.
   * If "strict" is set to zero, it will extend numeric fields as
   * necessary (overwriting terminators or using base-256 extensions).
   *
   * This is exported so that other 'tar' formats can use it.
   */
  int
  __archive_write_format_header_ustar(struct archive_write *a, char h[512],
      struct archive_entry *entry, int tartype, int strict,
      struct archive_string_conv *sconv)
  {
  	unsigned int checksum;
  	int i, r, ret;
  	size_t copy_length;
  	const char *p, *pp;
  	int mytartype;
  
  	ret = 0;
  	mytartype = -1;
  	/*
  	 * The "template header" already includes the "ustar"
  	 * signature, various end-of-field markers and other required
  	 * elements.
  	 */
  	memcpy(h, &template_header, 512);
  
  	/*
  	 * Because the block is already null-filled, and strings
  	 * are allowed to exactly fill their destination (without null),
  	 * I use memcpy(dest, src, strlen()) here a lot to copy strings.
  	 */
  	r = archive_entry_pathname_l(entry, &pp, &copy_length, sconv);
  	if (r != 0) {
  		if (errno == ENOMEM) {
  			archive_set_error(&a->archive, ENOMEM,
  			    "Can't allocate memory for Pathname");
  			return (ARCHIVE_FATAL);
  		}
  		archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
  		    "Can't translate pathname '%s' to %s",
  		    pp, archive_string_conversion_charset_name(sconv));
  		ret = ARCHIVE_WARN;
  	}
  	if (copy_length <= USTAR_name_size)
  		memcpy(h + USTAR_name_offset, pp, copy_length);
  	else {
  		/* Store in two pieces, splitting at a '/'. */
  		p = strchr(pp + copy_length - USTAR_name_size - 1, '/');
  		/*
  		 * Look for the next '/' if we chose the first character
  		 * as the separator.  (ustar format doesn't permit
  		 * an empty prefix.)
  		 */
  		if (p == pp)
  			p = strchr(p + 1, '/');
  		/* Fail if the name won't fit. */
  		if (!p) {
  			/* No separator. */
  			archive_set_error(&a->archive, ENAMETOOLONG,
  			    "Pathname too long");
  			ret = ARCHIVE_FAILED;
  		} else if (p[1] == '\0') {
  			/*
  			 * The only feasible separator is a final '/';
  			 * this would result in a non-empty prefix and
  			 * an empty name, which POSIX doesn't
  			 * explicitly forbid, but it just feels wrong.
  			 */
  			archive_set_error(&a->archive, ENAMETOOLONG,
  			    "Pathname too long");
  			ret = ARCHIVE_FAILED;
  		} else if (p  > pp + USTAR_prefix_size) {
  			/* Prefix is too long. */
  			archive_set_error(&a->archive, ENAMETOOLONG,
  			    "Pathname too long");
  			ret = ARCHIVE_FAILED;
  		} else {
  			/* Copy prefix and remainder to appropriate places */
  			memcpy(h + USTAR_prefix_offset, pp, p - pp);
  			memcpy(h + USTAR_name_offset, p + 1,
  			    pp + copy_length - p - 1);
  		}
  	}
  
  	r = archive_entry_hardlink_l(entry, &p, &copy_length, sconv);
  	if (r != 0) {
  		if (errno == ENOMEM) {
  			archive_set_error(&a->archive, ENOMEM,
  			    "Can't allocate memory for Linkname");
  			return (ARCHIVE_FATAL);
  		}
  		archive_set_error(&a->archive,
  		    ARCHIVE_ERRNO_FILE_FORMAT,
  		    "Can't translate linkname '%s' to %s",
  		    p, archive_string_conversion_charset_name(sconv));
  		ret = ARCHIVE_WARN;
  	}
  	if (copy_length > 0)
  		mytartype = '1';
  	else {
  		r = archive_entry_symlink_l(entry, &p, &copy_length, sconv);
  		if (r != 0) {
  			if (errno == ENOMEM) {
  				archive_set_error(&a->archive, ENOMEM,
  				    "Can't allocate memory for Linkname");
  				return (ARCHIVE_FATAL);
  			}
  			archive_set_error(&a->archive,
  			    ARCHIVE_ERRNO_FILE_FORMAT,
  			    "Can't translate linkname '%s' to %s",
  			    p, archive_string_conversion_charset_name(sconv));
  			ret = ARCHIVE_WARN;
  		}
  	}
  	if (copy_length > 0) {
  		if (copy_length > USTAR_linkname_size) {
  			archive_set_error(&a->archive, ENAMETOOLONG,
  			    "Link contents too long");
  			ret = ARCHIVE_FAILED;
  			copy_length = USTAR_linkname_size;
  		}
  		memcpy(h + USTAR_linkname_offset, p, copy_length);
  	}
  
  	r = archive_entry_uname_l(entry, &p, &copy_length, sconv);
  	if (r != 0) {
  		if (errno == ENOMEM) {
  			archive_set_error(&a->archive, ENOMEM,
  			    "Can't allocate memory for Uname");
  			return (ARCHIVE_FATAL);
  		}
  		archive_set_error(&a->archive,
  		    ARCHIVE_ERRNO_FILE_FORMAT,
  		    "Can't translate uname '%s' to %s",
  		    p, archive_string_conversion_charset_name(sconv));
  		ret = ARCHIVE_WARN;
  	}
  	if (copy_length > 0) {
  		if (copy_length > USTAR_uname_size) {
  			if (tartype != 'x') {
  				archive_set_error(&a->archive,
  				    ARCHIVE_ERRNO_MISC, "Username too long");
  				ret = ARCHIVE_FAILED;
  			}
  			copy_length = USTAR_uname_size;
  		}
  		memcpy(h + USTAR_uname_offset, p, copy_length);
  	}
  
  	r = archive_entry_gname_l(entry, &p, &copy_length, sconv);
  	if (r != 0) {
  		if (errno == ENOMEM) {
  			archive_set_error(&a->archive, ENOMEM,
  			    "Can't allocate memory for Gname");
  			return (ARCHIVE_FATAL);
  		}
  		archive_set_error(&a->archive,
  		    ARCHIVE_ERRNO_FILE_FORMAT,
  		    "Can't translate gname '%s' to %s",
  		    p, archive_string_conversion_charset_name(sconv));
  		ret = ARCHIVE_WARN;
  	}
  	if (copy_length > 0) {
  		if (strlen(p) > USTAR_gname_size) {
  			if (tartype != 'x') {
  				archive_set_error(&a->archive,
  				    ARCHIVE_ERRNO_MISC, "Group name too long");
  				ret = ARCHIVE_FAILED;
  			}
  			copy_length = USTAR_gname_size;
  		}
  		memcpy(h + USTAR_gname_offset, p, copy_length);
  	}
  
  	if (format_number(archive_entry_mode(entry) & 07777,
  	    h + USTAR_mode_offset, USTAR_mode_size, USTAR_mode_max_size, strict)) {
  		archive_set_error(&a->archive, ERANGE,
  		    "Numeric mode too large");
  		ret = ARCHIVE_FAILED;
  	}
  
  	if (format_number(archive_entry_uid(entry),
  	    h + USTAR_uid_offset, USTAR_uid_size, USTAR_uid_max_size, strict)) {
  		archive_set_error(&a->archive, ERANGE,
  		    "Numeric user ID too large");
  		ret = ARCHIVE_FAILED;
  	}
  
  	if (format_number(archive_entry_gid(entry),
  	    h + USTAR_gid_offset, USTAR_gid_size, USTAR_gid_max_size, strict)) {
  		archive_set_error(&a->archive, ERANGE,
  		    "Numeric group ID too large");
  		ret = ARCHIVE_FAILED;
  	}
  
  	if (format_number(archive_entry_size(entry),
  	    h + USTAR_size_offset, USTAR_size_size, USTAR_size_max_size, strict)) {
  		archive_set_error(&a->archive, ERANGE,
  		    "File size out of range");
  		ret = ARCHIVE_FAILED;
  	}
  
  	if (format_number(archive_entry_mtime(entry),
  	    h + USTAR_mtime_offset, USTAR_mtime_size, USTAR_mtime_max_size, strict)) {
  		archive_set_error(&a->archive, ERANGE,
  		    "File modification time too large");
  		ret = ARCHIVE_FAILED;
  	}
  
  	if (archive_entry_filetype(entry) == AE_IFBLK
  	    || archive_entry_filetype(entry) == AE_IFCHR) {
  		if (format_number(archive_entry_rdevmajor(entry),
  		    h + USTAR_rdevmajor_offset, USTAR_rdevmajor_size,
  		    USTAR_rdevmajor_max_size, strict)) {
  			archive_set_error(&a->archive, ERANGE,
  			    "Major device number too large");
  			ret = ARCHIVE_FAILED;
  		}
  
  		if (format_number(archive_entry_rdevminor(entry),
  		    h + USTAR_rdevminor_offset, USTAR_rdevminor_size,
  		    USTAR_rdevminor_max_size, strict)) {
  			archive_set_error(&a->archive, ERANGE,
  			    "Minor device number too large");
  			ret = ARCHIVE_FAILED;
  		}
  	}
  
  	if (tartype >= 0) {
  		h[USTAR_typeflag_offset] = tartype;
  	} else if (mytartype >= 0) {
  		h[USTAR_typeflag_offset] = mytartype;
  	} else {
  		switch (archive_entry_filetype(entry)) {
  		case AE_IFREG: h[USTAR_typeflag_offset] = '0' ; break;
  		case AE_IFLNK: h[USTAR_typeflag_offset] = '2' ; break;
  		case AE_IFCHR: h[USTAR_typeflag_offset] = '3' ; break;
  		case AE_IFBLK: h[USTAR_typeflag_offset] = '4' ; break;
  		case AE_IFDIR: h[USTAR_typeflag_offset] = '5' ; break;
  		case AE_IFIFO: h[USTAR_typeflag_offset] = '6' ; break;
  		default: /* AE_IFSOCK and unknown */
  			__archive_write_entry_filetype_unsupported(
  			    &a->archive, entry, "ustar");
  			ret = ARCHIVE_FAILED;
  		}
  	}
  
  	checksum = 0;
  	for (i = 0; i < 512; i++)
  		checksum += 255 & (unsigned int)h[i];
  	h[USTAR_checksum_offset + 6] = '\0'; /* Can't be pre-set in the template. */
  	/* h[USTAR_checksum_offset + 7] = ' '; */ /* This is pre-set in the template. */
  	format_octal(checksum, h + USTAR_checksum_offset, 6);
  	return (ret);
  }
  
  /*
   * Format a number into a field, with some intelligence.
   */
  static int
  format_number(int64_t v, char *p, int s, int maxsize, int strict)
  {
  	int64_t limit;
  
  	limit = ((int64_t)1 << (s*3));
  
  	/* "Strict" only permits octal values with proper termination. */
  	if (strict)
  		return (format_octal(v, p, s));
  
  	/*
  	 * In non-strict mode, we allow the number to overwrite one or
  	 * more bytes of the field termination.  Even old tar
  	 * implementations should be able to handle this with no
  	 * problem.
  	 */
  	if (v >= 0) {
  		while (s <= maxsize) {
  			if (v < limit)
  				return (format_octal(v, p, s));
  			s++;
  			limit <<= 3;
  		}
  	}
  
  	/* Base-256 can handle any number, positive or negative. */
  	return (format_256(v, p, maxsize));
  }
  
  /*
   * Format a number into the specified field using base-256.
   */
  static int
  format_256(int64_t v, char *p, int s)
  {
  	p += s;
  	while (s-- > 0) {
  		*--p = (char)(v & 0xff);
  		v >>= 8;
  	}
  	*p |= 0x80; /* Set the base-256 marker bit. */
  	return (0);
  }
  
  /*
   * Format a number into the specified field.
   */
  static int
  format_octal(int64_t v, char *p, int s)
  {
  	int len;
  
  	len = s;
  
  	/* Octal values can't be negative, so use 0. */
  	if (v < 0) {
  		while (len-- > 0)
  			*p++ = '0';
  		return (-1);
  	}
  
  	p += s;		/* Start at the end and work backwards. */
  	while (s-- > 0) {
  		*--p = (char)('0' + (v & 7));
  		v >>= 3;
  	}
  
  	if (v == 0)
  		return (0);
  
  	/* If it overflowed, fill field with max value. */
  	while (len-- > 0)
  		*p++ = '7';
  
  	return (-1);
  }
  
  static int
  archive_write_ustar_close(struct archive_write *a)
  {
  	return (__archive_write_nulls(a, 512*2));
  }
  
  static int
  archive_write_ustar_free(struct archive_write *a)
  {
  	struct ustar *ustar;
  
  	ustar = (struct ustar *)a->format_data;
  	free(ustar);
  	a->format_data = NULL;
  	return (ARCHIVE_OK);
  }
  
  static int
  archive_write_ustar_finish_entry(struct archive_write *a)
  {
  	struct ustar *ustar;
  	int ret;
  
  	ustar = (struct ustar *)a->format_data;
  	ret = __archive_write_nulls(a,
  	    (size_t)(ustar->entry_bytes_remaining + ustar->entry_padding));
  	ustar->entry_bytes_remaining = ustar->entry_padding = 0;
  	return (ret);
  }
  
  static ssize_t
  archive_write_ustar_data(struct archive_write *a, const void *buff, size_t s)
  {
  	struct ustar *ustar;
  	int ret;
  
  	ustar = (struct ustar *)a->format_data;
  	if (s > ustar->entry_bytes_remaining)
  		s = (size_t)ustar->entry_bytes_remaining;
  	ret = __archive_write_output(a, buff, s);
  	ustar->entry_bytes_remaining -= s;
  	if (ret != ARCHIVE_OK)
  		return (ret);
  	return (s);
  }
  