/*-
 * Copyright (c) 2008 Joerg Sonnenberger
 * Copyright (c) 2009-2012 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"

#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#include <errno.h>
#include <stdlib.h>
#include <string.h>

#include "archive.h"
#include "archive_digest_private.h"
#include "archive_entry.h"
#include "archive_entry_private.h"
#include "archive_private.h"
#include "archive_rb.h"
#include "archive_string.h"
#include "archive_write_private.h"

#define INDENTNAMELEN	15
#define MAXLINELEN	80
#define SET_KEYS	\
	(F_FLAGS | F_GID | F_GNAME | F_MODE | F_TYPE | F_UID | F_UNAME)

struct attr_counter {
	struct attr_counter *prev;
	struct attr_counter *next;
	struct mtree_entry *m_entry;
	int count;
};

struct attr_counter_set {
	struct attr_counter *uid_list;
	struct attr_counter *gid_list;
	struct attr_counter *mode_list;
	struct attr_counter *flags_list;
};

struct mtree_chain {
	struct mtree_entry *first;
	struct mtree_entry **last;
};

/*
 * The Data only for a directory file.
 */
struct dir_info {
	struct archive_rb_tree rbtree;
	struct mtree_chain children;
	struct mtree_entry *chnext;
	int virtual;
};

/*
 * The Data only for a regular file.
 */
struct reg_info {
	int compute_sum;
	uint32_t crc;
	uint_least32_t mset_digest;
	struct ae_digest digest;
};

struct mtree_entry {
	struct archive_rb_node rbnode;
	struct mtree_entry *next;
	struct mtree_entry *parent;
	struct dir_info *dir_info;
	struct reg_info *reg_info;

	struct archive_string parentdir;
	struct archive_string basename;
	struct archive_string pathname;
	struct archive_string symlink;
	struct archive_string uname;
	struct archive_string gname;
	struct archive_string fflags_text;
	unsigned int nlink;
	mode_t filetype;
	mode_t mode;
	int64_t size;
	int64_t uid;
	int64_t gid;
	time_t mtime;
	long mtime_nsec;
	unsigned long fflags_set;
	unsigned long fflags_clear;
	dev_t rdevmajor;
	dev_t rdevminor;
	dev_t devmajor;
	dev_t devminor;
	int64_t ino;
};

struct mtree_writer {
	struct mtree_entry *mtree_entry;
	struct mtree_entry *root;
	struct mtree_entry *cur_dirent;
	struct archive_string cur_dirstr;
	struct mtree_chain file_list;

	struct archive_string ebuf;
	struct archive_string buf;
	int first;
	uint64_t entry_bytes_remaining;

	/*
	 * Set global value.
	 */
	struct {
		int		processing;
		mode_t		type;
		int		keys;
		int64_t		uid;
		int64_t		gid;
		mode_t		mode;
		unsigned long	fflags_set;
		unsigned long	fflags_clear;
	} set;
	struct attr_counter_set	acs;
	int classic;
	int depth;

	/* check sum */
	int compute_sum;
	uint32_t crc;
	uint64_t crc_len;
#ifdef ARCHIVE_HAS_MD5
	archive_md5_ctx md5ctx;
#endif
#ifdef ARCHIVE_HAS_RMD160
	archive_rmd160_ctx rmd160ctx;
#endif
#ifdef ARCHIVE_HAS_SHA1
	archive_sha1_ctx sha1ctx;
#endif
#ifdef ARCHIVE_HAS_SHA256
	archive_sha256_ctx sha256ctx;
#endif
#ifdef ARCHIVE_HAS_SHA384
	archive_sha384_ctx sha384ctx;
#endif
#ifdef ARCHIVE_HAS_SHA512
	archive_sha512_ctx sha512ctx;
#endif
	/* Keyword options */
	int keys;
#define	F_CKSUM		0x00000001		/* checksum */
#define	F_DEV		0x00000002		/* device type */
#define	F_DONE		0x00000004		/* directory done */
#define	F_FLAGS		0x00000008		/* file flags */
#define	F_GID		0x00000010		/* gid */
#define	F_GNAME		0x00000020		/* group name */
#define	F_IGN		0x00000040		/* ignore */
#define	F_MAGIC		0x00000080		/* name has magic chars */
#define	F_MD5		0x00000100		/* MD5 digest */
#define	F_MODE		0x00000200		/* mode */
#define	F_NLINK		0x00000400		/* number of links */
#define	F_NOCHANGE 	0x00000800		/* If owner/mode "wrong", do
						 * not change */
#define	F_OPT		0x00001000		/* existence optional */
#define	F_RMD160 	0x00002000		/* RIPEMD160 digest */
#define	F_SHA1		0x00004000		/* SHA-1 digest */
#define	F_SIZE		0x00008000		/* size */
#define	F_SLINK		0x00010000		/* symbolic link */
#define	F_TAGS		0x00020000		/* tags */
#define	F_TIME		0x00040000		/* modification time */
#define	F_TYPE		0x00080000		/* file type */
#define	F_UID		0x00100000		/* uid */
#define	F_UNAME		0x00200000		/* user name */
#define	F_VISIT		0x00400000		/* file visited */
#define	F_SHA256	0x00800000		/* SHA-256 digest */
#define	F_SHA384	0x01000000		/* SHA-384 digest */
#define	F_SHA512	0x02000000		/* SHA-512 digest */
#define	F_INO		0x04000000		/* inode number */
#define	F_RESDEV	0x08000000		/* device ID on which the
						 * entry resides */

	/* Options */
	int dironly;		/* If it is set, ignore all files except
				 * directory files, like mtree(8) -d option. */
	int indent;		/* If it is set, indent output data. */
	int output_global_set;	/* If it is set, use /set keyword to set
				 * global values. When generating mtree
				 * classic format, it is set by default. */
};

#define DEFAULT_KEYS	(F_DEV | F_FLAGS | F_GID | F_GNAME | F_SLINK | F_MODE\
			 | F_NLINK | F_SIZE | F_TIME | F_TYPE | F_UID\
			 | F_UNAME)
#define attr_counter_set_reset	attr_counter_set_free

static void attr_counter_free(struct attr_counter **);
static int attr_counter_inc(struct attr_counter **, struct attr_counter *,
	struct attr_counter *, struct mtree_entry *);
static struct attr_counter * attr_counter_new(struct mtree_entry *,
	struct attr_counter *);
static int attr_counter_set_collect(struct mtree_writer *,
	struct mtree_entry *);
static void attr_counter_set_free(struct mtree_writer *);
static int get_global_set_keys(struct mtree_writer *, struct mtree_entry *);
static int mtree_entry_add_child_tail(struct mtree_entry *,
	struct mtree_entry *);
static int mtree_entry_create_virtual_dir(struct archive_write *, const char *,
	struct mtree_entry **);
static int mtree_entry_cmp_node(const struct archive_rb_node *,
	const struct archive_rb_node *);
static int mtree_entry_cmp_key(const struct archive_rb_node *, const void *);
static int mtree_entry_exchange_same_entry(struct archive_write *,
    struct mtree_entry *, struct mtree_entry *);
static void mtree_entry_free(struct mtree_entry *);
static int mtree_entry_new(struct archive_write *, struct archive_entry *,
	struct mtree_entry **);
static void mtree_entry_register_free(struct mtree_writer *);
static void mtree_entry_register_init(struct mtree_writer *);
static int mtree_entry_setup_filenames(struct archive_write *,
	struct mtree_entry *, struct archive_entry *);
static int mtree_entry_tree_add(struct archive_write *, struct mtree_entry **);
static void sum_init(struct mtree_writer *);
static void sum_update(struct mtree_writer *, const void *, size_t);
static void sum_final(struct mtree_writer *, struct reg_info *);
static void sum_write(struct archive_string *, struct reg_info *);
static int write_mtree_entry(struct archive_write *, struct mtree_entry *);
static int write_dot_dot_entry(struct archive_write *, struct mtree_entry *);

#define	COMPUTE_CRC(var, ch)	(var) = (var) << 8 ^ crctab[(var) >> 24 ^ (ch)]
static const uint32_t crctab[] = {
	0x0,
	0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b,
	0x1a864db2, 0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6,
	0x2b4bcb61, 0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd,
	0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9, 0x5f15adac,
	0x5bd4b01b, 0x569796c2, 0x52568b75, 0x6a1936c8, 0x6ed82b7f,
	0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3, 0x709f7b7a,
	0x745e66cd, 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
	0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 0xbe2b5b58,
	0xbaea46ef, 0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033,
	0xa4ad16ea, 0xa06c0b5d, 0xd4326d90, 0xd0f37027, 0xddb056fe,
	0xd9714b49, 0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95,
	0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1, 0xe13ef6f4,
	0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, 0x34867077, 0x30476dc0,
	0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5,
	0x2ac12072, 0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16,
	0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca, 0x7897ab07,
	0x7c56b6b0, 0x71159069, 0x75d48dde, 0x6b93dddb, 0x6f52c06c,
	0x6211e6b5, 0x66d0fb02, 0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1,
	0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
	0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b,
	0xbb60adfc, 0xb6238b25, 0xb2e29692, 0x8aad2b2f, 0x8e6c3698,
	0x832f1041, 0x87ee0df6, 0x99a95df3, 0x9d684044, 0x902b669d,
	0x94ea7b2a, 0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e,
	0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2, 0xc6bcf05f,
	0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34,
	0xdc3abded, 0xd8fba05a, 0x690ce0ee, 0x6dcdfd59, 0x608edb80,
	0x644fc637, 0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb,
	0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f, 0x5c007b8a,
	0x58c1663d, 0x558240e4, 0x51435d53, 0x251d3b9e, 0x21dc2629,
	0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5, 0x3f9b762c,
	0x3b5a6b9b, 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
	0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 0xf12f560e,
	0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65,
	0xeba91bbc, 0xef68060b, 0xd727bbb6, 0xd3e6a601, 0xdea580d8,
	0xda649d6f, 0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3,
	0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7, 0xae3afba2,
	0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, 0x9b3660c6, 0x9ff77d71,
	0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74,
	0x857130c3, 0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640,
	0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c, 0x7b827d21,
	0x7f436096, 0x7200464f, 0x76c15bf8, 0x68860bfd, 0x6c47164a,
	0x61043093, 0x65c52d24, 0x119b4be9, 0x155a565e, 0x18197087,
	0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
	0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d,
	0x2056cd3a, 0x2d15ebe3, 0x29d4f654, 0xc5a92679, 0xc1683bce,
	0xcc2b1d17, 0xc8ea00a0, 0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb,
	0xdbee767c, 0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18,
	0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4, 0x89b8fd09,
	0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662,
	0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf,
	0xa2f33668, 0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
};

static const unsigned char safe_char[256] = {
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 00 - 0F */
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 10 - 1F */
	/* !"$%&'()*+,-./  EXCLUSION:0x20( ) 0x23(#) */
	0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 20 - 2F */
	/* 0123456789:;<>?  EXCLUSION:0x3d(=) */
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, /* 30 - 3F */
	/* @ABCDEFGHIJKLMNO */
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 40 - 4F */
	/* PQRSTUVWXYZ[]^_ EXCLUSION:0x5c(\)  */
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, /* 50 - 5F */
	/* `abcdefghijklmno */
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 60 - 6F */
	/* pqrstuvwxyz{|}~ */
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, /* 70 - 7F */
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 80 - 8F */
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 90 - 9F */
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* A0 - AF */
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* B0 - BF */
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* C0 - CF */
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* D0 - DF */
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* E0 - EF */
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* F0 - FF */
};

static void
mtree_quote(struct archive_string *s, const char *str)
{
	const char *start;
	char buf[4];
	unsigned char c;

	for (start = str; *str != '\0'; ++str) {
		if (safe_char[*(const unsigned char *)str])
			continue;
		if (start != str)
			archive_strncat(s, start, str - start);
		c = (unsigned char)*str;
		buf[0] = '\\';
		buf[1] = (c / 64) + '0';
		buf[2] = (c / 8 % 8) + '0';
		buf[3] = (c % 8) + '0';
		archive_strncat(s, buf, 4);
		start = str + 1;
	}

	if (start != str)
		archive_strncat(s, start, str - start);
}

/*
 * Indent a line as the mtree utility does so it is readable for people.
 */
static void
mtree_indent(struct mtree_writer *mtree)
{
	int i, fn, nd, pd;
	const char *r, *s, *x;

	if (mtree->classic) {
		if (mtree->indent) {
			nd = 0;
			pd = mtree->depth * 4;
		} else {
			nd = mtree->depth?4:0;
			pd = 0;
		}
	} else
		nd = pd = 0;
	fn = 1;
	s = r = mtree->ebuf.s;
	x = NULL;
	while (*r == ' ')
		r++;
	while ((r = strchr(r, ' ')) != NULL) {
		if (fn) {
			fn = 0;
			for (i = 0; i < nd + pd; i++)
				archive_strappend_char(&mtree->buf, ' ');
			archive_strncat(&mtree->buf, s, r - s);
			if (nd + (r -s) > INDENTNAMELEN) {
				archive_strncat(&mtree->buf, " \\\n", 3);
				for (i = 0; i < (INDENTNAMELEN + 1 + pd); i++)
					archive_strappend_char(&mtree->buf, ' ');
			} else {
				for (i = (int)(r -s + nd);
				    i < (INDENTNAMELEN + 1); i++)
					archive_strappend_char(&mtree->buf, ' ');
			}
			s = ++r;
			x = NULL;
			continue;
		}
		if (pd + (r - s) <= MAXLINELEN - 3 - INDENTNAMELEN)
			x = r++;
		else {
			if (x == NULL)
				x = r;
			archive_strncat(&mtree->buf, s, x - s);
			archive_strncat(&mtree->buf, " \\\n", 3);
			for (i = 0; i < (INDENTNAMELEN + 1 + pd); i++)
				archive_strappend_char(&mtree->buf, ' ');
			s = r = ++x;
			x = NULL;
		}
	}
	if (fn) {
		for (i = 0; i < nd + pd; i++)
			archive_strappend_char(&mtree->buf, ' ');
		archive_strcat(&mtree->buf, s);
		s += strlen(s);
	}
	if (x != NULL && pd + strlen(s) > MAXLINELEN - 3 - INDENTNAMELEN) {
		/* Last keyword is longer. */
		archive_strncat(&mtree->buf, s, x - s);
		archive_strncat(&mtree->buf, " \\\n", 3);
		for (i = 0; i < (INDENTNAMELEN + 1 + pd); i++)
			archive_strappend_char(&mtree->buf, ' ');
		s = ++x;
	}
	archive_strcat(&mtree->buf, s);
	archive_string_empty(&mtree->ebuf);
}

/*
 * Write /set keyword.
 * Set the most used value of uid, gid, mode and fflags, which are
 * collected by the attr_counter_set_collect() function.
 */
static void
write_global(struct mtree_writer *mtree)
{
	struct archive_string setstr;
	struct archive_string unsetstr;
	struct attr_counter_set *acs;
	int keys, oldkeys, effkeys;

	archive_string_init(&setstr);
	archive_string_init(&unsetstr);
	keys = mtree->keys & SET_KEYS;
	oldkeys = mtree->set.keys;
	effkeys = keys;
	acs = &mtree->acs;
	if (mtree->set.processing) {
		/*
		 * Check if the global data needs updating.
		 */
		effkeys &= ~F_TYPE;
		if (acs->uid_list == NULL)
			effkeys &= ~(F_UNAME | F_UID);
		else if (oldkeys & (F_UNAME | F_UID)) {
			if (acs->uid_list->count < 2 ||
			    mtree->set.uid == acs->uid_list->m_entry->uid)
				effkeys &= ~(F_UNAME | F_UID);
		}
		if (acs->gid_list == NULL)
			effkeys &= ~(F_GNAME | F_GID);
		else if (oldkeys & (F_GNAME | F_GID)) {
			if (acs->gid_list->count < 2 ||
			    mtree->set.gid == acs->gid_list->m_entry->gid)
				effkeys &= ~(F_GNAME | F_GID);
		}
		if (acs->mode_list == NULL)
			effkeys &= ~F_MODE;
		else if (oldkeys & F_MODE) {
			if (acs->mode_list->count < 2 ||
			    mtree->set.mode == acs->mode_list->m_entry->mode)
				effkeys &= ~F_MODE;
		}
		if (acs->flags_list == NULL)
			effkeys &= ~F_FLAGS;
		else if ((oldkeys & F_FLAGS) != 0) {
			if (acs->flags_list->count < 2 ||
			    (acs->flags_list->m_entry->fflags_set ==
				mtree->set.fflags_set &&
			     acs->flags_list->m_entry->fflags_clear ==
				mtree->set.fflags_clear))
				effkeys &= ~F_FLAGS;
		}
	} else {
		if (acs->uid_list == NULL)
			keys &= ~(F_UNAME | F_UID);
		if (acs->gid_list == NULL)
			keys &= ~(F_GNAME | F_GID);
		if (acs->mode_list == NULL)
			keys &= ~F_MODE;
		if (acs->flags_list == NULL)
			keys &= ~F_FLAGS;
	}
	if ((keys & effkeys & F_TYPE) != 0) {
		if (mtree->dironly) {
			archive_strcat(&setstr, " type=dir");
			mtree->set.type = AE_IFDIR;
		} else {
			archive_strcat(&setstr, " type=file");
			mtree->set.type = AE_IFREG;
		}
	}
	if ((keys & effkeys & F_UNAME) != 0) {
		if (archive_strlen(&(acs->uid_list->m_entry->uname)) > 0) {
			archive_strcat(&setstr, " uname=");
			mtree_quote(&setstr, acs->uid_list->m_entry->uname.s);
		} else {
			keys &= ~F_UNAME;
			if ((oldkeys & F_UNAME) != 0)
				archive_strcat(&unsetstr, " uname");
		}
	}
	if ((keys & effkeys & F_UID) != 0) {
		mtree->set.uid = acs->uid_list->m_entry->uid;
		archive_string_sprintf(&setstr, " uid=%jd",
		    (intmax_t)mtree->set.uid);
	}
	if ((keys & effkeys & F_GNAME) != 0) {
		if (archive_strlen(&(acs->gid_list->m_entry->gname)) > 0) {
			archive_strcat(&setstr, " gname=");
			mtree_quote(&setstr, acs->gid_list->m_entry->gname.s);
		} else {
			keys &= ~F_GNAME;
			if ((oldkeys & F_GNAME) != 0)
				archive_strcat(&unsetstr, " gname");
		}
	}
	if ((keys & effkeys & F_GID) != 0) {
		mtree->set.gid = acs->gid_list->m_entry->gid;
		archive_string_sprintf(&setstr, " gid=%jd",
		    (intmax_t)mtree->set.gid);
	}
	if ((keys & effkeys & F_MODE) != 0) {
		mtree->set.mode = acs->mode_list->m_entry->mode;
		archive_string_sprintf(&setstr, " mode=%o",
		    (unsigned int)mtree->set.mode);
	}
	if ((keys & effkeys & F_FLAGS) != 0) {
		if (archive_strlen(
		    &(acs->flags_list->m_entry->fflags_text)) > 0) {
			archive_strcat(&setstr, " flags=");
			mtree_quote(&setstr,
			    acs->flags_list->m_entry->fflags_text.s);
			mtree->set.fflags_set =
			    acs->flags_list->m_entry->fflags_set;
			mtree->set.fflags_clear =
			    acs->flags_list->m_entry->fflags_clear;
		} else {
			keys &= ~F_FLAGS;
			if ((oldkeys & F_FLAGS) != 0)
				archive_strcat(&unsetstr, " flags");
		}
	}
	if (unsetstr.length > 0)
		archive_string_sprintf(&mtree->buf, "/unset%s\n", unsetstr.s);
	archive_string_free(&unsetstr);
	if (setstr.length > 0)
		archive_string_sprintf(&mtree->buf, "/set%s\n", setstr.s);
	archive_string_free(&setstr);
	mtree->set.keys = keys;
	mtree->set.processing = 1;
}

static struct attr_counter *
attr_counter_new(struct mtree_entry *me, struct attr_counter *prev)
{
	struct attr_counter *ac;

	ac = malloc(sizeof(*ac));
	if (ac != NULL) {
		ac->prev = prev;
		ac->next = NULL;
		ac->count = 1;
		ac->m_entry = me;
	}
	return (ac);
}

static void
attr_counter_free(struct attr_counter **top)
{
	struct attr_counter *ac, *tac;

	if (*top == NULL)
		return;
	ac = *top;
        while (ac != NULL) {
		tac = ac->next;
		free(ac);
		ac = tac;
	}
	*top = NULL;
}

static int
attr_counter_inc(struct attr_counter **top, struct attr_counter *ac,
    struct attr_counter *last, struct mtree_entry *me)
{
	struct attr_counter *pac;

	if (ac != NULL) {
		ac->count++;
		if (*top == ac || ac->prev->count >= ac->count)
			return (0);
		for (pac = ac->prev; pac; pac = pac->prev) {
			if (pac->count >= ac->count)
				break;
		}
		ac->prev->next = ac->next;
		if (ac->next != NULL)
			ac->next->prev = ac->prev;
		if (pac != NULL) {
			ac->prev = pac;
			ac->next = pac->next;
			pac->next = ac;
			if (ac->next != NULL)
				ac->next->prev = ac;
		} else {
			ac->prev = NULL;
			ac->next = *top;
			*top = ac;
			ac->next->prev = ac;
		}
	} else if (last != NULL) {
		ac = attr_counter_new(me, last);
		if (ac == NULL)
			return (-1);
		last->next = ac;
	}
	return (0);
}

/*
 * Tabulate uid, gid, mode and fflags of a entry in order to be used for /set.
 */
static int
attr_counter_set_collect(struct mtree_writer *mtree, struct mtree_entry *me)
{
	struct attr_counter *ac, *last;
	struct attr_counter_set *acs = &mtree->acs;
	int keys = mtree->keys;

	if (keys & (F_UNAME | F_UID)) {
		if (acs->uid_list == NULL) {
			acs->uid_list = attr_counter_new(me, NULL);
			if (acs->uid_list == NULL)
				return (-1);
		} else {
			last = NULL;
			for (ac = acs->uid_list; ac; ac = ac->next) {
				if (ac->m_entry->uid == me->uid)
					break;
				last = ac;
			}
			if (attr_counter_inc(&acs->uid_list, ac, last, me) < 0)
				return (-1);
		}
	}
	if (keys & (F_GNAME | F_GID)) {
		if (acs->gid_list == NULL) {
			acs->gid_list = attr_counter_new(me, NULL);
			if (acs->gid_list == NULL)
				return (-1);
		} else {
			last = NULL;
			for (ac = acs->gid_list; ac; ac = ac->next) {
				if (ac->m_entry->gid == me->gid)
					break;
				last = ac;
			}
			if (attr_counter_inc(&acs->gid_list, ac, last, me) < 0)
				return (-1);
		}
	}
	if (keys & F_MODE) {
		if (acs->mode_list == NULL) {
			acs->mode_list = attr_counter_new(me, NULL);
			if (acs->mode_list == NULL)
				return (-1);
		} else {
			last = NULL;
			for (ac = acs->mode_list; ac; ac = ac->next) {
				if (ac->m_entry->mode == me->mode)
					break;
				last = ac;
			}
			if (attr_counter_inc(&acs->mode_list, ac, last, me) < 0)
				return (-1);
		}
	}
	if (keys & F_FLAGS) {
		if (acs->flags_list == NULL) {
			acs->flags_list = attr_counter_new(me, NULL);
			if (acs->flags_list == NULL)
				return (-1);
		} else {
			last = NULL;
			for (ac = acs->flags_list; ac; ac = ac->next) {
				if (ac->m_entry->fflags_set == me->fflags_set &&
				    ac->m_entry->fflags_clear ==
							me->fflags_clear)
					break;
				last = ac;
			}
			if (attr_counter_inc(&acs->flags_list, ac, last, me) < 0)
				return (-1);
		}
	}

	return (0);
}

static void
attr_counter_set_free(struct mtree_writer *mtree)
{
	struct attr_counter_set *acs = &mtree->acs;

	attr_counter_free(&acs->uid_list);
	attr_counter_free(&acs->gid_list);
	attr_counter_free(&acs->mode_list);
	attr_counter_free(&acs->flags_list);
}

static int
get_global_set_keys(struct mtree_writer *mtree, struct mtree_entry *me)
{
	int keys;

	keys = mtree->keys;

	/*
	 * If a keyword has been set by /set, we do not need to
	 * output it.
	 */
	if (mtree->set.keys == 0)
		return (keys);/* /set is not used. */

	if ((mtree->set.keys & (F_GNAME | F_GID)) != 0 &&
	     mtree->set.gid == me->gid)
		keys &= ~(F_GNAME | F_GID);
	if ((mtree->set.keys & (F_UNAME | F_UID)) != 0 &&
	     mtree->set.uid == me->uid)
		keys &= ~(F_UNAME | F_UID);
	if (mtree->set.keys & F_FLAGS) {
		if (mtree->set.fflags_set == me->fflags_set &&
		    mtree->set.fflags_clear == me->fflags_clear)
			keys &= ~F_FLAGS;
	}
	if ((mtree->set.keys & F_MODE) != 0 && mtree->set.mode == me->mode)
		keys &= ~F_MODE;

	switch (me->filetype) {
	case AE_IFLNK: case AE_IFSOCK: case AE_IFCHR:
	case AE_IFBLK: case AE_IFIFO:
		break;
	case AE_IFDIR:
		if ((mtree->set.keys & F_TYPE) != 0 &&
		    mtree->set.type == AE_IFDIR)
			keys &= ~F_TYPE;
		break;
	case AE_IFREG:
	default:	/* Handle unknown file types as regular files. */
		if ((mtree->set.keys & F_TYPE) != 0 &&
		    mtree->set.type == AE_IFREG)
			keys &= ~F_TYPE;
		break;
	}

	return (keys);
}

static int
mtree_entry_new(struct archive_write *a, struct archive_entry *entry,
    struct mtree_entry **m_entry)
{
	struct mtree_entry *me;
	const char *s;
	int r;
	static const struct archive_rb_tree_ops rb_ops = {
		mtree_entry_cmp_node, mtree_entry_cmp_key
	};

	me = calloc(1, sizeof(*me));
	if (me == NULL) {
		archive_set_error(&a->archive, ENOMEM,
		    "Can't allocate memory for a mtree entry");
		*m_entry = NULL;
		return (ARCHIVE_FATAL);
	}

	r = mtree_entry_setup_filenames(a, me, entry);
	if (r < ARCHIVE_WARN) {
		mtree_entry_free(me);
		*m_entry = NULL;
		return (r);
	}

	if ((s = archive_entry_symlink(entry)) != NULL)
		archive_strcpy(&me->symlink, s);
	me->nlink = archive_entry_nlink(entry);
	me->filetype = archive_entry_filetype(entry);
	me->mode = archive_entry_mode(entry) & 07777;
	me->uid = archive_entry_uid(entry);
	me->gid = archive_entry_gid(entry);
	if ((s = archive_entry_uname(entry)) != NULL)
		archive_strcpy(&me->uname, s);
	if ((s = archive_entry_gname(entry)) != NULL)
		archive_strcpy(&me->gname, s);
	if ((s = archive_entry_fflags_text(entry)) != NULL)
		archive_strcpy(&me->fflags_text, s);
	archive_entry_fflags(entry, &me->fflags_set, &me->fflags_clear);
	me->mtime = archive_entry_mtime(entry);
	me->mtime_nsec = archive_entry_mtime_nsec(entry);
	me->rdevmajor = archive_entry_rdevmajor(entry);
	me->rdevminor = archive_entry_rdevminor(entry);
	me->devmajor = archive_entry_devmajor(entry);
	me->devminor = archive_entry_devminor(entry);
	me->ino = archive_entry_ino(entry);
	me->size = archive_entry_size(entry);
	if (me->filetype == AE_IFDIR) {
		me->dir_info = calloc(1, sizeof(*me->dir_info));
		if (me->dir_info == NULL) {
			mtree_entry_free(me);
			archive_set_error(&a->archive, ENOMEM,
			    "Can't allocate memory for a mtree entry");
			*m_entry = NULL;
			return (ARCHIVE_FATAL);
		}
		__archive_rb_tree_init(&me->dir_info->rbtree, &rb_ops);
		me->dir_info->children.first = NULL;
		me->dir_info->children.last = &(me->dir_info->children.first);
		me->dir_info->chnext = NULL;
	} else if (me->filetype == AE_IFREG) {
		me->reg_info = calloc(1, sizeof(*me->reg_info));
		if (me->reg_info == NULL) {
			mtree_entry_free(me);
			archive_set_error(&a->archive, ENOMEM,
			    "Can't allocate memory for a mtree entry");
			*m_entry = NULL;
			return (ARCHIVE_FATAL);
		}
		me->reg_info->compute_sum = 0;
	}

	*m_entry = me;
	return (ARCHIVE_OK);
}

static void
mtree_entry_free(struct mtree_entry *me)
{
	archive_string_free(&me->parentdir);
	archive_string_free(&me->basename);
	archive_string_free(&me->pathname);
	archive_string_free(&me->symlink);
	archive_string_free(&me->uname);
	archive_string_free(&me->gname);
	archive_string_free(&me->fflags_text);
	free(me->dir_info);
	free(me->reg_info);
	free(me);
}

static void
mtree_copy_ae_digests(struct reg_info *reg, struct archive_entry *entry, int compute_sum)
{
	reg->compute_sum = compute_sum;
	reg->mset_digest = entry->mset_digest;

	if ((reg->compute_sum & F_MD5)
		&& (reg->mset_digest & AE_MSET_DIGEST_MD5)) {

		memcpy(&reg->digest.md5, entry->digest.md5,
			sizeof(reg->digest.md5));
	}
	if ((reg->compute_sum & F_RMD160)
		&& (reg->mset_digest & AE_MSET_DIGEST_RMD160)) {

		memcpy(&reg->digest.rmd160, entry->digest.rmd160,
			sizeof(reg->digest.rmd160));
	}
	if ((reg->compute_sum & F_SHA1)
		&& (reg->mset_digest & AE_MSET_DIGEST_SHA1)) {

		memcpy(&reg->digest.sha1, entry->digest.sha1,
			sizeof(reg->digest.sha1));
	}
	if ((reg->compute_sum & F_SHA256)
		&& (reg->mset_digest & AE_MSET_DIGEST_SHA256)) {

		memcpy(&reg->digest.sha256, entry->digest.sha256,
			sizeof(reg->digest.sha256));
	}
	if ((reg->compute_sum & F_SHA384)
		&& (reg->mset_digest & AE_MSET_DIGEST_SHA384)) {

		memcpy(&reg->digest.sha384, entry->digest.sha384,
			sizeof(reg->digest.sha384));
	}
	if ((reg->compute_sum & F_SHA512)
		&& (reg->mset_digest & AE_MSET_DIGEST_SHA512)) {

		memcpy(&reg->digest.sha512, entry->digest.sha512,
			sizeof(reg->digest.sha512));
	}
}

static int
archive_write_mtree_header(struct archive_write *a,
    struct archive_entry *entry)
{
	struct mtree_writer *mtree= a->format_data;
	struct mtree_entry *mtree_entry;
	int r, r2;

	if (mtree->first) {
		mtree->first = 0;
		archive_strcat(&mtree->buf, "#mtree\n");
		if ((mtree->keys & SET_KEYS) == 0)
			mtree->output_global_set = 0;/* Disabled. */
	}

	mtree->entry_bytes_remaining = archive_entry_size(entry);

	/* While directory only mode, we do not handle non directory files. */
	if (mtree->dironly && archive_entry_filetype(entry) != AE_IFDIR)
		return (ARCHIVE_OK);

	r2 = mtree_entry_new(a, entry, &mtree_entry);
	if (r2 < ARCHIVE_WARN)
		return (r2);
	r = mtree_entry_tree_add(a, &mtree_entry);
	if (r < ARCHIVE_WARN) {
		mtree_entry_free(mtree_entry);
		return (r);
	}
	mtree->mtree_entry = mtree_entry;

	/* If the current file is a regular file, we have to
	 * compute the sum of its content.
	 * Initialize a bunch of checksum context. */
	if (mtree_entry->reg_info) {
		sum_init(mtree);
		/* honor archive_entry_set_digest() calls. These values will be
		 * overwritten if archive_write_mtree_data() is called */
		mtree_copy_ae_digests(mtree_entry->reg_info, entry, mtree->compute_sum);
	}

	return (r2);
}

static int
write_mtree_entry(struct archive_write *a, struct mtree_entry *me)
{
	struct mtree_writer *mtree = a->format_data;
	struct archive_string *str;
	int keys, ret;

	if (me->dir_info) {
		if (mtree->classic) {
			/*
			 * Output a comment line to describe the full
			 * pathname of the entry as mtree utility does
			 * while generating classic format.
			 */
			if (!mtree->dironly)
				archive_strappend_char(&mtree->buf, '\n');
			if (me->parentdir.s)
				archive_string_sprintf(&mtree->buf,
				    "# %s/%s\n",
				    me->parentdir.s, me->basename.s);
			else
				archive_string_sprintf(&mtree->buf,
				    "# %s\n",
				    me->basename.s);
		}
		if (mtree->output_global_set)
			write_global(mtree);
	}
	archive_string_empty(&mtree->ebuf);
	str = (mtree->indent || mtree->classic)? &mtree->ebuf : &mtree->buf;

	if (!mtree->classic && me->parentdir.s) {
		/*
		 * If generating format is not classic one(v1), output
		 * a full pathname.
		 */
		mtree_quote(str, me->parentdir.s);
		archive_strappend_char(str, '/');
	}
	mtree_quote(str, me->basename.s);

	keys = get_global_set_keys(mtree, me);
	if ((keys & F_NLINK) != 0 &&
	    me->nlink != 1 && me->filetype != AE_IFDIR)
		archive_string_sprintf(str, " nlink=%u", me->nlink);

	if ((keys & F_GNAME) != 0 && archive_strlen(&me->gname) > 0) {
		archive_strcat(str, " gname=");
		mtree_quote(str, me->gname.s);
	}
	if ((keys & F_UNAME) != 0 && archive_strlen(&me->uname) > 0) {
		archive_strcat(str, " uname=");
		mtree_quote(str, me->uname.s);
	}
	if ((keys & F_FLAGS) != 0) {
		if (archive_strlen(&me->fflags_text) > 0) {
			archive_strcat(str, " flags=");
			mtree_quote(str, me->fflags_text.s);
		} else if (mtree->set.processing &&
		    (mtree->set.keys & F_FLAGS) != 0)
			/* Overwrite the global parameter. */
			archive_strcat(str, " flags=none");
	}
	if ((keys & F_TIME) != 0)
		archive_string_sprintf(str, " time=%jd.%jd",
		    (intmax_t)me->mtime, (intmax_t)me->mtime_nsec);
	if ((keys & F_MODE) != 0)
		archive_string_sprintf(str, " mode=%o", (unsigned int)me->mode);
	if ((keys & F_GID) != 0)
		archive_string_sprintf(str, " gid=%jd", (intmax_t)me->gid);
	if ((keys & F_UID) != 0)
		archive_string_sprintf(str, " uid=%jd", (intmax_t)me->uid);

	if ((keys & F_INO) != 0)
		archive_string_sprintf(str, " inode=%jd", (intmax_t)me->ino);
	if ((keys & F_RESDEV) != 0) {
		archive_string_sprintf(str,
		    " resdevice=native,%ju,%ju",
		    (uintmax_t)me->devmajor,
		    (uintmax_t)me->devminor);
	}

	switch (me->filetype) {
	case AE_IFLNK:
		if ((keys & F_TYPE) != 0)
			archive_strcat(str, " type=link");
		if ((keys & F_SLINK) != 0) {
			archive_strcat(str, " link=");
			mtree_quote(str, me->symlink.s);
		}
		break;
	case AE_IFSOCK:
		if ((keys & F_TYPE) != 0)
			archive_strcat(str, " type=socket");
		break;
	case AE_IFCHR:
		if ((keys & F_TYPE) != 0)
			archive_strcat(str, " type=char");
		if ((keys & F_DEV) != 0) {
			archive_string_sprintf(str,
			    " device=native,%ju,%ju",
			    (uintmax_t)me->rdevmajor,
			    (uintmax_t)me->rdevminor);
		}
		break;
	case AE_IFBLK:
		if ((keys & F_TYPE) != 0)
			archive_strcat(str, " type=block");
		if ((keys & F_DEV) != 0) {
			archive_string_sprintf(str,
			    " device=native,%ju,%ju",
			    (uintmax_t)me->rdevmajor,
			    (uintmax_t)me->rdevminor);
		}
		break;
	case AE_IFDIR:
		if ((keys & F_TYPE) != 0)
			archive_strcat(str, " type=dir");
		break;
	case AE_IFIFO:
		if ((keys & F_TYPE) != 0)
			archive_strcat(str, " type=fifo");
		break;
	case AE_IFREG:
	default:	/* Handle unknown file types as regular files. */
		if ((keys & F_TYPE) != 0)
			archive_strcat(str, " type=file");
		if ((keys & F_SIZE) != 0)
			archive_string_sprintf(str, " size=%jd",
			    (intmax_t)me->size);
		break;
	}

	/* Write a bunch of sum. */
	if (me->reg_info)
		sum_write(str, me->reg_info);

	archive_strappend_char(str, '\n');
	if (mtree->indent || mtree->classic)
		mtree_indent(mtree);

	if (mtree->buf.length > 32768) {
		ret = __archive_write_output(
			a, mtree->buf.s, mtree->buf.length);
		archive_string_empty(&mtree->buf);
	} else
		ret = ARCHIVE_OK;
	return (ret);
}

static int
write_dot_dot_entry(struct archive_write *a, struct mtree_entry *n)
{
	struct mtree_writer *mtree = a->format_data;
	int ret;

	if (n->parentdir.s) {
		if (mtree->indent) {
			int i, pd = mtree->depth * 4;
			for (i = 0; i < pd; i++)
				archive_strappend_char(&mtree->buf, ' ');
		}
		archive_string_sprintf(&mtree->buf, "# %s/%s\n",
			n->parentdir.s, n->basename.s);
	}

	if (mtree->indent) {
		archive_string_empty(&mtree->ebuf);
		archive_strncat(&mtree->ebuf, "..\n\n", (mtree->dironly)?3:4);
		mtree_indent(mtree);
	} else
		archive_strncat(&mtree->buf, "..\n\n", (mtree->dironly)?3:4);

	if (mtree->buf.length > 32768) {
		ret = __archive_write_output(
			a, mtree->buf.s, mtree->buf.length);
		archive_string_empty(&mtree->buf);
	} else
		ret = ARCHIVE_OK;
	return (ret);
}

/*
 * Write mtree entries saved at attr_counter_set_collect() function.
 */
static int
write_mtree_entry_tree(struct archive_write *a)
{
	struct mtree_writer *mtree = a->format_data;
	struct mtree_entry *np = mtree->root;
	struct archive_rb_node *n;
	int ret;

	do {
		if (mtree->output_global_set) {
			/*
			 * Collect attribute information to know which value
			 * is frequently used among the children.
			 */
			attr_counter_set_reset(mtree);
			ARCHIVE_RB_TREE_FOREACH(n, &(np->dir_info->rbtree)) {
				struct mtree_entry *e = (struct mtree_entry *)n;
				if (attr_counter_set_collect(mtree, e) < 0) {
					archive_set_error(&a->archive, ENOMEM,
					    "Can't allocate memory");
					return (ARCHIVE_FATAL);
				}
			}
		}
		if (!np->dir_info->virtual || mtree->classic) {
			ret = write_mtree_entry(a, np);
			if (ret != ARCHIVE_OK)
				return (ARCHIVE_FATAL);
		} else {
			/* Whenever output_global_set is enabled
			 * output global value(/set keywords)
			 * even if the directory entry is not allowed
			 * to be written because the global values
			 * can be used for the children. */
			if (mtree->output_global_set)
				write_global(mtree);
		}
		/*
		 * Output the attribute of all files except directory files.
		 */
		mtree->depth++;
		ARCHIVE_RB_TREE_FOREACH(n, &(np->dir_info->rbtree)) {
			struct mtree_entry *e = (struct mtree_entry *)n;

			if (e->dir_info)
				mtree_entry_add_child_tail(np, e);
			else {
				ret = write_mtree_entry(a, e);
				if (ret != ARCHIVE_OK)
					return (ARCHIVE_FATAL);
			}
		}
		mtree->depth--;

		if (np->dir_info->children.first != NULL) {
			/*
			 * Descend the tree.
			 */
			np = np->dir_info->children.first;
			if (mtree->indent)
				mtree->depth++;
			continue;
		} else if (mtree->classic) {
			/*
			 * While printing mtree classic, if there are not
			 * any directory files(except "." and "..") in the
			 * directory, output two dots ".." as returning
			 * the parent directory.
			 */
			ret = write_dot_dot_entry(a, np);
			if (ret != ARCHIVE_OK)
				return (ARCHIVE_FATAL);
		}

		while (np != np->parent) {
			if (np->dir_info->chnext == NULL) {
				/*
				 * Ascend the tree; go back to the parent.
				 */
				if (mtree->indent)
					mtree->depth--;
				if (mtree->classic) {
					ret = write_dot_dot_entry(a,
						np->parent);
					if (ret != ARCHIVE_OK)
						return (ARCHIVE_FATAL);
				}
				np = np->parent;
			} else {
				/*
				 * Switch to next mtree entry in the directory.
				 */
				np = np->dir_info->chnext;
				break;
			}
		}
	} while (np != np->parent); 

	return (ARCHIVE_OK);
}

static int
archive_write_mtree_finish_entry(struct archive_write *a)
{
	struct mtree_writer *mtree = a->format_data;
	struct mtree_entry *me;

	if ((me = mtree->mtree_entry) == NULL)
		return (ARCHIVE_OK);
	mtree->mtree_entry = NULL;

	if (me->reg_info)
		sum_final(mtree, me->reg_info);

	return (ARCHIVE_OK);
}

static int
archive_write_mtree_close(struct archive_write *a)
{
	struct mtree_writer *mtree= a->format_data;
	int ret;

	if (mtree->root != NULL) {
		ret = write_mtree_entry_tree(a);
		if (ret != ARCHIVE_OK)
			return (ARCHIVE_FATAL);
	}

	archive_write_set_bytes_in_last_block(&a->archive, 1);

	return __archive_write_output(a, mtree->buf.s, mtree->buf.length);
}

static ssize_t
archive_write_mtree_data(struct archive_write *a, const void *buff, size_t n)
{
	struct mtree_writer *mtree= a->format_data;

	if (n > mtree->entry_bytes_remaining)
		n = (size_t)mtree->entry_bytes_remaining;
	mtree->entry_bytes_remaining -= n;

	/* We don't need to compute a regular file sum */
	if (mtree->mtree_entry == NULL)
		return (n);

	if (mtree->mtree_entry->filetype == AE_IFREG)
		sum_update(mtree, buff, n);

	return (n);
}

static int
archive_write_mtree_free(struct archive_write *a)
{
	struct mtree_writer *mtree= a->format_data;

	if (mtree == NULL)
		return (ARCHIVE_OK);

	/* Make sure we do not leave any entries. */
	mtree_entry_register_free(mtree);
	archive_string_free(&mtree->cur_dirstr);
	archive_string_free(&mtree->ebuf);
	archive_string_free(&mtree->buf);
	attr_counter_set_free(mtree);
	free(mtree);
	a->format_data = NULL;
	return (ARCHIVE_OK);
}

static int
archive_write_mtree_options(struct archive_write *a, const char *key,
    const char *value)
{
	struct mtree_writer *mtree= a->format_data;
	int keybit = 0;

	switch (key[0]) {
	case 'a':
		if (strcmp(key, "all") == 0)
			keybit = ~0;
		break;
	case 'c':
		if (strcmp(key, "cksum") == 0)
			keybit = F_CKSUM;
		break;
	case 'd':
		if (strcmp(key, "device") == 0)
			keybit = F_DEV;
		else if (strcmp(key, "dironly") == 0) {
			mtree->dironly = (value != NULL)? 1: 0;
			return (ARCHIVE_OK);
		}
		break;
	case 'f':
		if (strcmp(key, "flags") == 0)
			keybit = F_FLAGS;
		break;
	case 'g':
		if (strcmp(key, "gid") == 0)
			keybit = F_GID;
		else if (strcmp(key, "gname") == 0)
			keybit = F_GNAME;
		break;
	case 'i':
		if (strcmp(key, "indent") == 0) {
			mtree->indent = (value != NULL)? 1: 0;
			return (ARCHIVE_OK);
		} else if (strcmp(key, "inode") == 0) {
			keybit = F_INO;
		}
		break;
	case 'l':
		if (strcmp(key, "link") == 0)
			keybit = F_SLINK;
		break;
	case 'm':
		if (strcmp(key, "md5") == 0 ||
		    strcmp(key, "md5digest") == 0)
			keybit = F_MD5;
		if (strcmp(key, "mode") == 0)
			keybit = F_MODE;
		break;
	case 'n':
		if (strcmp(key, "nlink") == 0)
			keybit = F_NLINK;
		break;
	case 'r':
		if (strcmp(key, "resdevice") == 0) {
			keybit = F_RESDEV;
		} else if (strcmp(key, "ripemd160digest") == 0 ||
		    strcmp(key, "rmd160") == 0 ||
		    strcmp(key, "rmd160digest") == 0)
			keybit = F_RMD160;
		break;
	case 's':
		if (strcmp(key, "sha1") == 0 ||
		    strcmp(key, "sha1digest") == 0)
			keybit = F_SHA1;
		if (strcmp(key, "sha256") == 0 ||
		    strcmp(key, "sha256digest") == 0)
			keybit = F_SHA256;
		if (strcmp(key, "sha384") == 0 ||
		    strcmp(key, "sha384digest") == 0)
			keybit = F_SHA384;
		if (strcmp(key, "sha512") == 0 ||
		    strcmp(key, "sha512digest") == 0)
			keybit = F_SHA512;
		if (strcmp(key, "size") == 0)
			keybit = F_SIZE;
		break;
	case 't':
		if (strcmp(key, "time") == 0)
			keybit = F_TIME;
		else if (strcmp(key, "type") == 0)
			keybit = F_TYPE;
		break;
	case 'u':
		if (strcmp(key, "uid") == 0)
			keybit = F_UID;
		else if (strcmp(key, "uname") == 0)
			keybit = F_UNAME;
		else if (strcmp(key, "use-set") == 0) {
			mtree->output_global_set = (value != NULL)? 1: 0;
			return (ARCHIVE_OK);
		}
		break;
	}
	if (keybit != 0) {
		if (value != NULL)
			mtree->keys |= keybit;
		else
			mtree->keys &= ~keybit;
		return (ARCHIVE_OK);
	}

	/* 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_set_format_mtree_default(struct archive *_a, const char *fn)
{
	struct archive_write *a = (struct archive_write *)_a;
	struct mtree_writer *mtree;

	archive_check_magic(_a, ARCHIVE_WRITE_MAGIC, ARCHIVE_STATE_NEW, fn);

	if (a->format_free != NULL)
		(a->format_free)(a);

	if ((mtree = calloc(1, sizeof(*mtree))) == NULL) {
		archive_set_error(&a->archive, ENOMEM,
		    "Can't allocate mtree data");
		return (ARCHIVE_FATAL);
	}

	mtree->mtree_entry = NULL;
	mtree->first = 1;
	memset(&(mtree->set), 0, sizeof(mtree->set));
	mtree->keys = DEFAULT_KEYS;
	mtree->dironly = 0;
	mtree->indent = 0;
	archive_string_init(&mtree->ebuf);
	archive_string_init(&mtree->buf);
	mtree_entry_register_init(mtree);
	a->format_data = mtree;
	a->format_free = archive_write_mtree_free;
	a->format_name = "mtree";
	a->format_options = archive_write_mtree_options;
	a->format_write_header = archive_write_mtree_header;
	a->format_close = archive_write_mtree_close;
	a->format_write_data = archive_write_mtree_data;
	a->format_finish_entry = archive_write_mtree_finish_entry;
	a->archive.archive_format = ARCHIVE_FORMAT_MTREE;
	a->archive.archive_format_name = "mtree";

	return (ARCHIVE_OK);
}

int
archive_write_set_format_mtree(struct archive *_a)
{
	return archive_write_set_format_mtree_default(_a,
		"archive_write_set_format_mtree");
}

int
archive_write_set_format_mtree_classic(struct archive *_a)
{
	int r;

	r = archive_write_set_format_mtree_default(_a,
		"archive_write_set_format_mtree_classic");
	if (r == ARCHIVE_OK) {
		struct archive_write *a = (struct archive_write *)_a;
		struct mtree_writer *mtree;

		mtree = (struct mtree_writer *)a->format_data;

		/* Set to output a mtree archive in classic format. */
		mtree->classic = 1;
		/* Basically, mtree classic format uses '/set' global
		 * value. */
		mtree->output_global_set = 1;
	}
	return (r);
}

static void
sum_init(struct mtree_writer *mtree)
{

	mtree->compute_sum = 0;

	if (mtree->keys & F_CKSUM) {
		mtree->compute_sum |= F_CKSUM;
		mtree->crc = 0;
		mtree->crc_len = 0;
	}
#ifdef ARCHIVE_HAS_MD5
	if (mtree->keys & F_MD5) {
		if (archive_md5_init(&mtree->md5ctx) == ARCHIVE_OK)
			mtree->compute_sum |= F_MD5;
		else
			mtree->keys &= ~F_MD5;/* Not supported. */
	}
#endif
#ifdef ARCHIVE_HAS_RMD160
	if (mtree->keys & F_RMD160) {
		if (archive_rmd160_init(&mtree->rmd160ctx) == ARCHIVE_OK)
			mtree->compute_sum |= F_RMD160;
		else
			mtree->keys &= ~F_RMD160;/* Not supported. */
	}
#endif
#ifdef ARCHIVE_HAS_SHA1
	if (mtree->keys & F_SHA1) {
		if (archive_sha1_init(&mtree->sha1ctx) == ARCHIVE_OK)
			mtree->compute_sum |= F_SHA1;
		else
			mtree->keys &= ~F_SHA1;/* Not supported. */
	}
#endif
#ifdef ARCHIVE_HAS_SHA256
	if (mtree->keys & F_SHA256) {
		if (archive_sha256_init(&mtree->sha256ctx) == ARCHIVE_OK)
			mtree->compute_sum |= F_SHA256;
		else
			mtree->keys &= ~F_SHA256;/* Not supported. */
	}
#endif
#ifdef ARCHIVE_HAS_SHA384
	if (mtree->keys & F_SHA384) {
		if (archive_sha384_init(&mtree->sha384ctx) == ARCHIVE_OK)
			mtree->compute_sum |= F_SHA384;
		else
			mtree->keys &= ~F_SHA384;/* Not supported. */
	}
#endif
#ifdef ARCHIVE_HAS_SHA512
	if (mtree->keys & F_SHA512) {
		if (archive_sha512_init(&mtree->sha512ctx) == ARCHIVE_OK)
			mtree->compute_sum |= F_SHA512;
		else
			mtree->keys &= ~F_SHA512;/* Not supported. */
	}
#endif
}

static void
sum_update(struct mtree_writer *mtree, const void *buff, size_t n)
{
	if (mtree->compute_sum & F_CKSUM) {
		/*
		 * Compute a POSIX 1003.2 checksum
		 */
		const unsigned char *p;
		size_t nn;

		for (nn = n, p = buff; nn--; ++p)
			COMPUTE_CRC(mtree->crc, *p);
		mtree->crc_len += n;
	}
#ifdef ARCHIVE_HAS_MD5
	if (mtree->compute_sum & F_MD5) {
		archive_md5_update(&mtree->md5ctx, buff, n);
		mtree->mtree_entry->reg_info->mset_digest &=
			~AE_MSET_DIGEST_MD5;
	}
#endif
#ifdef ARCHIVE_HAS_RMD160
	if (mtree->compute_sum & F_RMD160) {
		archive_rmd160_update(&mtree->rmd160ctx, buff, n);
		mtree->mtree_entry->reg_info->mset_digest &=
			~AE_MSET_DIGEST_RMD160;
	}
#endif
#ifdef ARCHIVE_HAS_SHA1
	if (mtree->compute_sum & F_SHA1) {
		archive_sha1_update(&mtree->sha1ctx, buff, n);
		mtree->mtree_entry->reg_info->mset_digest &=
			~AE_MSET_DIGEST_SHA1;
	}
#endif
#ifdef ARCHIVE_HAS_SHA256
	if (mtree->compute_sum & F_SHA256) {
		archive_sha256_update(&mtree->sha256ctx, buff, n);
		mtree->mtree_entry->reg_info->mset_digest &=
			~AE_MSET_DIGEST_SHA256;
	}
#endif
#ifdef ARCHIVE_HAS_SHA384
	if (mtree->compute_sum & F_SHA384) {
		archive_sha384_update(&mtree->sha384ctx, buff, n);
		mtree->mtree_entry->reg_info->mset_digest &=
			~AE_MSET_DIGEST_SHA384;
	}
#endif
#ifdef ARCHIVE_HAS_SHA512
	if (mtree->compute_sum & F_SHA512) {
		archive_sha512_update(&mtree->sha512ctx, buff, n);
		mtree->mtree_entry->reg_info->mset_digest &=
			~AE_MSET_DIGEST_SHA512;
	}
#endif
}

static void
sum_final(struct mtree_writer *mtree, struct reg_info *reg)
{

	if (mtree->compute_sum & F_CKSUM) {
		uint64_t len;
		/* Include the length of the file. */
		for (len = mtree->crc_len; len != 0; len >>= 8)
			COMPUTE_CRC(mtree->crc, len & 0xff);
		reg->crc = ~mtree->crc;
	}
#ifdef ARCHIVE_HAS_MD5
	if ((mtree->compute_sum & F_MD5)
		&& !(reg->mset_digest & AE_MSET_DIGEST_MD5))

		archive_md5_final(&mtree->md5ctx, reg->digest.md5);
#endif
#ifdef ARCHIVE_HAS_RMD160
	if ((mtree->compute_sum & F_RMD160)
		&& !(reg->mset_digest & AE_MSET_DIGEST_RMD160))

		archive_rmd160_final(&mtree->rmd160ctx, reg->digest.rmd160);
#endif
#ifdef ARCHIVE_HAS_SHA1
	if ((mtree->compute_sum & F_SHA1)
		&& !(reg->mset_digest & AE_MSET_DIGEST_SHA1))

		archive_sha1_final(&mtree->sha1ctx, reg->digest.sha1);
#endif
#ifdef ARCHIVE_HAS_SHA256
	if ((mtree->compute_sum & F_SHA256)
		&& !(reg->mset_digest & AE_MSET_DIGEST_SHA256))

		archive_sha256_final(&mtree->sha256ctx, reg->digest.sha256);
#endif
#ifdef ARCHIVE_HAS_SHA384
	if ((mtree->compute_sum & F_SHA384)
		&& !(reg->mset_digest & AE_MSET_DIGEST_SHA384))

		archive_sha384_final(&mtree->sha384ctx, reg->digest.sha384);
#endif
#ifdef ARCHIVE_HAS_SHA512
	if ((mtree->compute_sum & F_SHA512)
		&& !(reg->mset_digest & AE_MSET_DIGEST_SHA512))

		archive_sha512_final(&mtree->sha512ctx, reg->digest.sha512);
#endif
	/* Save what types of sum are computed. */
	reg->compute_sum = mtree->compute_sum;
}

#if defined(ARCHIVE_HAS_MD5) || defined(ARCHIVE_HAS_RMD160) || \
    defined(ARCHIVE_HAS_SHA1) || defined(ARCHIVE_HAS_SHA256) || \
    defined(ARCHIVE_HAS_SHA384) || defined(ARCHIVE_HAS_SHA512)
static void
strappend_bin(struct archive_string *s, const unsigned char *bin, int n)
{
	static const char hex[] = "0123456789abcdef";
	int i;

	for (i = 0; i < n; i++) {
		archive_strappend_char(s, hex[bin[i] >> 4]);
		archive_strappend_char(s, hex[bin[i] & 0x0f]);
	}
}
#endif

static void
sum_write(struct archive_string *str, struct reg_info *reg)
{

	if (reg->compute_sum & F_CKSUM) {
		archive_string_sprintf(str, " cksum=%ju",
		    (uintmax_t)reg->crc);
	}

#define append_digest(_s, _r, _t) \
	strappend_bin(_s, _r->digest._t, sizeof(_r->digest._t))

#ifdef ARCHIVE_HAS_MD5
	if (reg->compute_sum & F_MD5) {
		archive_strcat(str, " md5digest=");
		append_digest(str, reg, md5);
	}
#endif
#ifdef ARCHIVE_HAS_RMD160
	if (reg->compute_sum & F_RMD160) {
		archive_strcat(str, " rmd160digest=");
		append_digest(str, reg, rmd160);
	}
#endif
#ifdef ARCHIVE_HAS_SHA1
	if (reg->compute_sum & F_SHA1) {
		archive_strcat(str, " sha1digest=");
		append_digest(str, reg, sha1);
	}
#endif
#ifdef ARCHIVE_HAS_SHA256
	if (reg->compute_sum & F_SHA256) {
		archive_strcat(str, " sha256digest=");
		append_digest(str, reg, sha256);
	}
#endif
#ifdef ARCHIVE_HAS_SHA384
	if (reg->compute_sum & F_SHA384) {
		archive_strcat(str, " sha384digest=");
		append_digest(str, reg, sha384);
	}
#endif
#ifdef ARCHIVE_HAS_SHA512
	if (reg->compute_sum & F_SHA512) {
		archive_strcat(str, " sha512digest=");
		append_digest(str, reg, sha512);
	}
#endif
#undef append_digest
}

static int
mtree_entry_cmp_node(const struct archive_rb_node *n1,
    const struct archive_rb_node *n2)
{
	const struct mtree_entry *e1 = (const struct mtree_entry *)n1;
	const struct mtree_entry *e2 = (const struct mtree_entry *)n2;

	return (strcmp(e2->basename.s, e1->basename.s));
}

static int
mtree_entry_cmp_key(const struct archive_rb_node *n, const void *key)
{
	const struct mtree_entry *e = (const struct mtree_entry *)n;

	return (strcmp((const char *)key, e->basename.s));
}

#if defined(_WIN32) || defined(__CYGWIN__)
static int
cleanup_backslash_1(char *p)
{
	int mb, dos;

	mb = dos = 0;
	while (*p) {
		if (*(unsigned char *)p > 127)
			mb = 1;
		if (*p == '\\') {
			/* If we have not met any multi-byte characters,
			 * we can replace '\' with '/'. */
			if (!mb)
				*p = '/';
			dos = 1;
		}
		p++;
	}
	if (!mb || !dos)
		return (0);
	return (-1);
}

static void
cleanup_backslash_2(wchar_t *p)
{

	/* Convert a path-separator from '\' to  '/' */
	while (*p != L'\0') {
		if (*p == L'\\')
			*p = L'/';
		p++;
	}
}
#endif

/*
 * Generate a parent directory name and a base name from a pathname.
 */
static int
mtree_entry_setup_filenames(struct archive_write *a, struct mtree_entry *file,
    struct archive_entry *entry)
{
	const char *pathname;
	char *p, *dirname, *slash;
	size_t len;
	int ret = ARCHIVE_OK;

	archive_strcpy(&file->pathname, archive_entry_pathname(entry));
#if defined(_WIN32) || defined(__CYGWIN__)
	/*
	 * Convert a path-separator from '\' to  '/'
	 */
	if (cleanup_backslash_1(file->pathname.s) != 0) {
		const wchar_t *wp = archive_entry_pathname_w(entry);
		struct archive_wstring ws;

		if (wp != NULL) {
			int r;
			archive_string_init(&ws);
			archive_wstrcpy(&ws, wp);
			cleanup_backslash_2(ws.s);
			archive_string_empty(&(file->pathname));
			r = archive_string_append_from_wcs(&(file->pathname),
			    ws.s, ws.length);
			archive_wstring_free(&ws);
			if (r < 0 && errno == ENOMEM) {
				archive_set_error(&a->archive, ENOMEM,
				    "Can't allocate memory");
				return (ARCHIVE_FATAL);
			}
		}
	}
#else
	(void)a; /* UNUSED */
#endif
	pathname =  file->pathname.s;
	if (strcmp(pathname, ".") == 0) {
		archive_strcpy(&file->basename, ".");
		return (ARCHIVE_OK);
	}

	archive_strcpy(&(file->parentdir), pathname);

	len = file->parentdir.length;
	p = dirname = file->parentdir.s;

	/*
	 * Remove leading '/' and '../' elements
	 */
	while (*p) {
		if (p[0] == '/') {
			p++;
			len--;
		} else if (p[0] != '.')
			break;
		else if (p[1] == '.' && p[2] == '/') {
			p += 3;
			len -= 3;
		} else
			break;
	}
	if (p != dirname) {
		memmove(dirname, p, len+1);
		p = dirname;
	}
	/*
	 * Remove "/","/." and "/.." elements from tail.
	 */
	while (len > 0) {
		size_t ll = len;

		if (len > 0 && p[len-1] == '/') {
			p[len-1] = '\0';
			len--;
		}
		if (len > 1 && p[len-2] == '/' && p[len-1] == '.') {
			p[len-2] = '\0';
			len -= 2;
		}
		if (len > 2 && p[len-3] == '/' && p[len-2] == '.' &&
		    p[len-1] == '.') {
			p[len-3] = '\0';
			len -= 3;
		}
		if (ll == len)
			break;
	}
	while (*p) {
		if (p[0] == '/') {
			if (p[1] == '/')
				/* Convert '//' --> '/' */
				memmove(p, p+1, strlen(p+1) + 1);
			else if (p[1] == '.' && p[2] == '/')
				/* Convert '/./' --> '/' */
				memmove(p, p+2, strlen(p+2) + 1);
			else if (p[1] == '.' && p[2] == '.' && p[3] == '/') {
				/* Convert 'dir/dir1/../dir2/'
				 *     --> 'dir/dir2/'
				 */
				char *rp = p -1;
				while (rp >= dirname) {
					if (*rp == '/')
						break;
					--rp;
				}
				if (rp > dirname) {
					strcpy(rp, p+3);
					p = rp;
				} else {
					strcpy(dirname, p+4);
					p = dirname;
				}
			} else
				p++;
		} else
			p++;
	}
	p = dirname;
	len = strlen(p);

	/*
	 * Add "./" prefix.
	 * NOTE: If the pathname does not have a path separator, we have
	 * to add "./" to the head of the pathname because mtree reader
	 * will suppose that it is v1(a.k.a classic) mtree format and
	 * change the directory unexpectedly and so it will make a wrong
	 * path.
	 */
	if (strcmp(p, ".") != 0 && strncmp(p, "./", 2) != 0) {
		struct archive_string as;
		archive_string_init(&as);
		archive_strcpy(&as, "./");
		archive_strncat(&as, p, len);
		archive_string_empty(&file->parentdir);
		archive_string_concat(&file->parentdir, &as);
		archive_string_free(&as);
		p = file->parentdir.s;
		len = archive_strlen(&file->parentdir);
	}

	/*
	 * Find out the position which points to the last position of
	 * path separator('/').
	 */
	slash = NULL;
	for (; *p != '\0'; p++) {
		if (*p == '/')
			slash = p;
	}
	if (slash == NULL) {
		/* The pathname doesn't have a parent directory. */
		file->parentdir.length = len;
		archive_string_copy(&(file->basename), &(file->parentdir));
		archive_string_empty(&(file->parentdir));
		*file->parentdir.s = '\0';
		return (ret);
	}

	/* Make a basename from file->parentdir.s and slash */
	*slash  = '\0';
	file->parentdir.length = slash - file->parentdir.s;
	archive_strcpy(&(file->basename),  slash + 1);
	return (ret);
}

static int
mtree_entry_create_virtual_dir(struct archive_write *a, const char *pathname,
    struct mtree_entry **m_entry)
{
	struct archive_entry *entry;
	struct mtree_entry *file;
	int r;

	entry = archive_entry_new();
	if (entry == NULL) {
		*m_entry = NULL;
		archive_set_error(&a->archive, ENOMEM,
		    "Can't allocate memory");
		return (ARCHIVE_FATAL);
	}
	archive_entry_copy_pathname(entry, pathname);
	archive_entry_set_mode(entry, AE_IFDIR | 0755);
	archive_entry_set_mtime(entry, time(NULL), 0);

	r = mtree_entry_new(a, entry, &file);
	archive_entry_free(entry);
	if (r < ARCHIVE_WARN) {
		*m_entry = NULL;
		archive_set_error(&a->archive, ENOMEM,
		    "Can't allocate memory");
		return (ARCHIVE_FATAL);
	}

	file->dir_info->virtual = 1;

	*m_entry = file;
	return (ARCHIVE_OK);
}

static void
mtree_entry_register_add(struct mtree_writer *mtree, struct mtree_entry *file)
{
        file->next = NULL;
        *mtree->file_list.last = file;
        mtree->file_list.last = &(file->next);
}

static void
mtree_entry_register_init(struct mtree_writer *mtree)
{
	mtree->file_list.first = NULL;
	mtree->file_list.last = &(mtree->file_list.first);
}

static void
mtree_entry_register_free(struct mtree_writer *mtree)
{
	struct mtree_entry *file, *file_next;

	file = mtree->file_list.first;
	while (file != NULL) {
		file_next = file->next;
		mtree_entry_free(file);
		file = file_next;
	}
}

static int
mtree_entry_add_child_tail(struct mtree_entry *parent,
    struct mtree_entry *child)
{
	child->dir_info->chnext = NULL;
	*parent->dir_info->children.last = child;
	parent->dir_info->children.last = &(child->dir_info->chnext);
	return (1);
}

/*
 * Find an entry from a parent entry with given name.
 */
static struct mtree_entry *
mtree_entry_find_child(struct mtree_entry *parent, const char *child_name)
{
	struct mtree_entry *np;

	if (parent == NULL)
		return (NULL);
	np = (struct mtree_entry *)__archive_rb_tree_find_node(
	    &(parent->dir_info->rbtree), child_name);
	return (np);
}

static int
get_path_component(char *name, size_t n, const char *fn)
{
	char *p;
	size_t l;

	p = strchr(fn, '/');
	if (p == NULL) {
		if ((l = strlen(fn)) == 0)
			return (0);
	} else
		l = p - fn;
	if (l > n -1)
		return (-1);
	memcpy(name, fn, l);
	name[l] = '\0';

	return ((int)l);
}

/*
 * Add a new entry into the tree.
 */
static int
mtree_entry_tree_add(struct archive_write *a, struct mtree_entry **filep)
{
#if defined(_WIN32) && !defined(__CYGWIN__)
	char name[_MAX_FNAME];/* Included null terminator size. */
#elif defined(NAME_MAX) && NAME_MAX >= 255
	char name[NAME_MAX+1];
#else
	char name[256];
#endif
	struct mtree_writer *mtree = (struct mtree_writer *)a->format_data;
	struct mtree_entry *dent, *file, *np;
	const char *fn, *p;
	int l, r;

	file = *filep;
	if (file->parentdir.length == 0 && file->basename.length == 1 &&
	    file->basename.s[0] == '.') {
		file->parent = file;
		if (mtree->root != NULL) {
			np = mtree->root;
			goto same_entry;
		}
		mtree->root = file;
		mtree_entry_register_add(mtree, file);
		return (ARCHIVE_OK);
	}

	if (file->parentdir.length == 0) {
		archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
		    "Internal programming error "
		    "in generating canonical name for %s",
		    file->pathname.s);
		return (ARCHIVE_FAILED);
	}

	fn = p = file->parentdir.s;

	/*
	 * If the path of the parent directory of `file' entry is
	 * the same as the path of `cur_dirent', add `file' entry to
	 * `cur_dirent'.
	 */
	if (archive_strlen(&(mtree->cur_dirstr))
	      == archive_strlen(&(file->parentdir)) &&
	    strcmp(mtree->cur_dirstr.s, fn) == 0) {
		if (!__archive_rb_tree_insert_node(
		    &(mtree->cur_dirent->dir_info->rbtree),
		    (struct archive_rb_node *)file)) {
			/* There is the same name in the tree. */
			np = (struct mtree_entry *)__archive_rb_tree_find_node(
			    &(mtree->cur_dirent->dir_info->rbtree),
			    file->basename.s);
			goto same_entry;
		}
		file->parent = mtree->cur_dirent;
		mtree_entry_register_add(mtree, file);
		return (ARCHIVE_OK);
	}

	dent = mtree->root;
	for (;;) {
		l = get_path_component(name, sizeof(name), fn);
		if (l == 0) {
			np = NULL;
			break;
		}
		if (l < 0) {
			archive_set_error(&a->archive,
			    ARCHIVE_ERRNO_MISC,
			    "A name buffer is too small");
			return (ARCHIVE_FATAL);
		}
		if (l == 1 && name[0] == '.' && dent != NULL &&
		    dent == mtree->root) {
			fn += l;
			if (fn[0] == '/')
				fn++;
			continue;
		}

		np = mtree_entry_find_child(dent, name);
		if (np == NULL || fn[0] == '\0')
			break;

		/* Find next sub directory. */
		if (!np->dir_info) {
			/* NOT a directory! */
			archive_set_error(&a->archive,
			    ARCHIVE_ERRNO_MISC,
			    "`%s' is not a directory, we cannot insert `%s' ",
			    np->pathname.s, file->pathname.s);
			return (ARCHIVE_FAILED);
		}
		fn += l;
		if (fn[0] == '/')
			fn++;
		dent = np;
	}
	if (np == NULL) {
		/*
		 * Create virtual parent directories.
		 */
		while (fn[0] != '\0') {
			struct mtree_entry *vp;
			struct archive_string as;

			archive_string_init(&as);
			archive_strncat(&as, p, fn - p + l);
			if (as.s[as.length-1] == '/') {
				as.s[as.length-1] = '\0';
				as.length--;
			}
			r = mtree_entry_create_virtual_dir(a, as.s, &vp);
			archive_string_free(&as);
			if (r < ARCHIVE_WARN)
				return (r);

			if (strcmp(vp->pathname.s, ".") == 0) {
				vp->parent = vp;
				mtree->root = vp;
			} else {
				__archive_rb_tree_insert_node(
				    &(dent->dir_info->rbtree),
				    (struct archive_rb_node *)vp);
				vp->parent = dent;
			}
			mtree_entry_register_add(mtree, vp);
			np = vp;

			fn += l;
			if (fn[0] == '/')
				fn++;
			l = get_path_component(name, sizeof(name), fn);
			if (l < 0) {
				archive_string_free(&as);
				archive_set_error(&a->archive,
				    ARCHIVE_ERRNO_MISC,
				    "A name buffer is too small");
				return (ARCHIVE_FATAL);
			}
			dent = np;
		}

		/* Found out the parent directory where `file' can be
		 * inserted. */
		mtree->cur_dirent = dent;
		archive_string_empty(&(mtree->cur_dirstr));
		if (archive_string_ensure(&(mtree->cur_dirstr),
		    archive_strlen(&(dent->parentdir)) +
		    archive_strlen(&(dent->basename)) + 2) == NULL) {
			archive_set_error(&a->archive, ENOMEM,
			    "Can't allocate memory");
			return (ARCHIVE_FATAL);
		}
		if (archive_strlen(&(dent->parentdir)) +
		    archive_strlen(&(dent->basename)) == 0)
			mtree->cur_dirstr.s[0] = 0;
		else {
			if (archive_strlen(&(dent->parentdir)) > 0) {
				archive_string_copy(&(mtree->cur_dirstr),
				    &(dent->parentdir));
				archive_strappend_char(
				    &(mtree->cur_dirstr), '/');
			}
			archive_string_concat(&(mtree->cur_dirstr),
			    &(dent->basename));
		}

		if (!__archive_rb_tree_insert_node(
		    &(dent->dir_info->rbtree),
		    (struct archive_rb_node *)file)) {
			np = (struct mtree_entry *)__archive_rb_tree_find_node(
			    &(dent->dir_info->rbtree), file->basename.s);
			goto same_entry;
		}
		file->parent = dent;
		mtree_entry_register_add(mtree, file);
		return (ARCHIVE_OK);
	}

same_entry:
	/* We already have an entry with same filename. */
	r = mtree_entry_exchange_same_entry(a, np, file);
	if (r < ARCHIVE_WARN)
		return (r);
	if (np->dir_info)
		np->dir_info->virtual = 0;
	*filep = np;
	mtree_entry_free(file);
	return (ARCHIVE_WARN);
}

static int
mtree_entry_exchange_same_entry(struct archive_write *a, struct mtree_entry *np,
    struct mtree_entry *file)
{

	if ((np->mode & AE_IFMT) != (file->mode & AE_IFMT)) {
		archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
		    "Found duplicate entries for `%s' with "
		    "differing file types",
		    np->pathname.s);
		return (ARCHIVE_FAILED);
	}

	/* Update the existing mtree entry's attributes by the new one's. */
	archive_string_empty(&np->symlink);
	archive_string_concat(&np->symlink, &file->symlink);
	archive_string_empty(&np->uname);
	archive_string_concat(&np->uname, &file->uname);
	archive_string_empty(&np->gname);
	archive_string_concat(&np->gname, &file->gname);
	archive_string_empty(&np->fflags_text);
	archive_string_concat(&np->fflags_text, &file->fflags_text);
	np->nlink = file->nlink;
	np->filetype = file->filetype;
	np->mode = file->mode;
	np->size = file->size;
	np->uid = file->uid;
	np->gid = file->gid;
	np->fflags_set = file->fflags_set;
	np->fflags_clear = file->fflags_clear;
	np->mtime = file->mtime;
	np->mtime_nsec = file->mtime_nsec;
	np->rdevmajor = file->rdevmajor;
	np->rdevminor = file->rdevminor;
	np->devmajor = file->devmajor;
	np->devminor = file->devminor;
	np->ino = file->ino;

	return (ARCHIVE_WARN);
}
