/*-
 * Copyright (c) 2009 Michihiro NAKAJIMA
 * Copyright (c) 2008 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.
 */

#include "archive_platform.h"
__FBSDID("$FreeBSD: head/lib/libarchive/archive_write_set_format_mtree.c 201171 2009-12-29 06:39:07Z kientzle $");

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

#include "archive.h"
#include "archive_entry.h"
#include "archive_private.h"
#include "archive_write_private.h"

#include "archive_hash.h"

#define INDENTNAMELEN	15
#define MAXLINELEN	80

struct mtree_writer {
	struct archive_entry *entry;
	struct archive_string ebuf;
	struct archive_string buf;
	int first;
	uint64_t entry_bytes_remaining;
	struct {
		int		output;
		int		processed;
		struct archive_string parent;
		mode_t		type;
		int		keys;
		uid_t		uid;
		gid_t		gid;
		mode_t		mode;
		unsigned long	fflags_set;
		unsigned long	fflags_clear;
	} set;
	/* chekc 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		/* check sum */
#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 */

	/* Options */
	int dironly;		/* if the dironly is 1, ignore everything except
				 * directory type files. like mtree(8) -d option.
				 */
	int indent;		/* if the indent is 1, indent writing data. */
};

#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	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 int
mtree_safe_char(char c)
{
	if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
		return 1;
	if (c >= '0' && c <= '9')
		return 1;
	if (c == 35 || c == 61 || c == 92)
		return 0; /* #, = and \ are always quoted */
	
	if (c >= 33 && c <= 47) /* !"$%&'()*+,-./ */
		return 1;
	if (c >= 58 && c <= 64) /* :;<>?@ */
		return 1;
	if (c >= 91 && c <= 96) /* []^_` */
		return 1;
	if (c >= 123 && c <= 126) /* {|}~ */
		return 1;
	return 0;
}

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 (mtree_safe_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);
}

static void
mtree_indent(struct mtree_writer *mtree)
{
	int i, fn;
	const char *r, *s, *x;

	fn = 1;
	s = r = mtree->ebuf.s;
	x = NULL;
	while (*r == ' ')
		r++;
	while ((r = strchr(r, ' ')) != NULL) {
		if (fn) {
			fn = 0;
			archive_strncat(&mtree->buf, s, r - s);
			if (r -s > INDENTNAMELEN) {
				archive_strncat(&mtree->buf, " \\\n", 3);
				for (i = 0; i < (INDENTNAMELEN + 1); i++)
					archive_strappend_char(&mtree->buf, ' ');
			} else {
				for (i = r -s; i < (INDENTNAMELEN + 1); i++)
					archive_strappend_char(&mtree->buf, ' ');
			}
			s = ++r;
			x = NULL;
			continue;
		}
		if (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); i++)
				archive_strappend_char(&mtree->buf, ' ');
			s = r = ++x;
			x = NULL;
		}
	}
	if (x != NULL && 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); i++)
			archive_strappend_char(&mtree->buf, ' ');
		s = ++x;
	}
	archive_strcat(&mtree->buf, s);
	archive_string_empty(&mtree->ebuf);
}

#if !defined(_WIN32) || defined(__CYGWIN__)
static size_t
dir_len(struct archive_entry *entry)
{
	const char *path, *r;

	path = archive_entry_pathname(entry);
	r = strrchr(path, '/');
	if (r == NULL)
		return (0);
	/* Include a separator size */
	return (r - path + 1);
}

#else /* _WIN32 && !__CYGWIN__ */
/*
 * Note: We should use wide-character for findng '\' character,
 * a directory separator on Windows, because some character-set have
 * been using the '\' character for a part of its multibyte character
 * code.
 */
static size_t
dir_len(struct archive_entry *entry)
{
	wchar_t wc;
	const char *path;
	const char *p, *rp;
	size_t al, l, size;

	path = archive_entry_pathname(entry);
	al = l = -1;
	for (p = path; *p != '\0'; ++p) {
		if (*p == '\\')
			al = l = p - path;
		else if (*p == '/')
			al = p - path;
	}
	if (l == -1)
		goto alen;
	size = p - path;
	rp = p = path;
	while (*p != '\0') {
		l = mbtowc(&wc, p, size);
		if (l == -1)
			goto alen;
		if (l == 1 && (wc == L'/' || wc == L'\\'))
			rp = p;
		p += l;
		size -= l;
	}
	return (rp - path + 1);
alen:
	if (al == -1)
		return (0);
	return (al + 1);
}
#endif /* _WIN32 && !__CYGWIN__ */

static int
parent_dir_changed(struct archive_string *dir, struct archive_entry *entry)
{
	const char *path;
	size_t l;

	l = dir_len(entry);
	path = archive_entry_pathname(entry);
	if (archive_strlen(dir) > 0) {
		if (l == 0) {
			archive_string_empty(dir);
			return (1);
		}
		if (strncmp(dir->s, path, l) == 0)
			return (0); /* The parent directory is the same. */
	} else if (l == 0)
		return (0);	    /* The parent directory is the same. */
	archive_strncpy(dir, path, l);
	return (1);
}

/*
 * Write /set keyword. It means set global datas.
 * [directory-only mode]
 *   - It is only once to write /set keyword. It is using values of the
 *     first entry.
 * [normal mode]
 *   - Write /set keyword. It is using values of the first entry whose
 *     filetype is a regular file.
 *   - When a parent directory of the entry whose filetype is the regular
 *     file is changed, check the global datas and write it again if its
 *     values are different from the entry's.
 */
static void
set_global(struct mtree_writer *mtree, struct archive_entry *entry)
{
	struct archive_string setstr;
	struct archive_string unsetstr;
	const char *name;
	int keys, oldkeys, effkeys;
	mode_t set_type = 0;

	switch (archive_entry_filetype(entry)) {
	case AE_IFLNK: case AE_IFSOCK: case AE_IFCHR:
	case AE_IFBLK: case AE_IFIFO:
		break;
	case AE_IFDIR:
		if (mtree->dironly)
			set_type = AE_IFDIR;
		break;
	case AE_IFREG:
	default:	/* Handle unknown file types as regular files. */
		if (!mtree->dironly)
			set_type = AE_IFREG;
		break;
	}
	if (set_type == 0)
		return;
	if (mtree->set.processed &&
	    !parent_dir_changed(&mtree->set.parent, entry))
		return;
	/* At first, save a parent directory of the entry for following
	 * entries. */
	if (!mtree->set.processed && set_type == AE_IFREG)
		parent_dir_changed(&mtree->set.parent, entry);

	archive_string_init(&setstr);
	archive_string_init(&unsetstr);
	keys = mtree->keys & (F_FLAGS | F_GID | F_GNAME | F_NLINK | F_MODE
	    | F_TYPE | F_UID | F_UNAME);
	oldkeys = mtree->set.keys;
	effkeys = keys;
	if (mtree->set.processed) {
		/*
		 * Check the global datas for whether it needs updating.
		 */
		effkeys &= ~F_TYPE;
		if ((oldkeys & (F_UNAME | F_UID)) != 0 &&
		    mtree->set.uid == archive_entry_uid(entry))
			effkeys &= ~(F_UNAME | F_UID);
		if ((oldkeys & (F_GNAME | F_GID)) != 0 &&
		    mtree->set.gid == archive_entry_gid(entry))
			effkeys &= ~(F_GNAME | F_GID);
		if ((oldkeys & F_MODE) != 0 &&
		    mtree->set.mode == (archive_entry_mode(entry) & 07777))
			effkeys &= ~F_MODE;
		if ((oldkeys & F_FLAGS) != 0) {
			unsigned long	fflags_set;
			unsigned long	fflags_clear;

			archive_entry_fflags(entry, &fflags_set, &fflags_clear);
			if (fflags_set == mtree->set.fflags_set &&
			    fflags_clear == mtree->set.fflags_clear)
				effkeys &= ~F_FLAGS;
		}
	}
	if ((keys & effkeys & F_TYPE) != 0) {
		mtree->set.type = set_type;
		if (set_type == AE_IFDIR)
			archive_strcat(&setstr, " type=dir");
		else
			archive_strcat(&setstr, " type=file");
	}
	if ((keys & effkeys & F_UNAME) != 0) {
		if ((name = archive_entry_uname(entry)) != NULL) {
			archive_strcat(&setstr, " uname=");
			mtree_quote(&setstr, name);
		} else if ((oldkeys & F_UNAME) != 0)
			archive_strcat(&unsetstr, " uname");
		else
			keys &= ~F_UNAME;
	}
	if ((keys & effkeys & F_UID) != 0) {
		mtree->set.uid = archive_entry_uid(entry);
		archive_string_sprintf(&setstr, " uid=%jd",
		    (intmax_t)mtree->set.uid);
	}
	if ((keys & effkeys & F_GNAME) != 0) {
		if ((name = archive_entry_gname(entry)) != NULL) {
			archive_strcat(&setstr, " gname=");
			mtree_quote(&setstr, name);
		} else if ((oldkeys & F_GNAME) != 0)
			archive_strcat(&unsetstr, " gname");
		else
			keys &= ~F_GNAME;
	}
	if ((keys & effkeys & F_GID) != 0) {
		mtree->set.gid = archive_entry_gid(entry);
		archive_string_sprintf(&setstr, " gid=%jd",
		    (intmax_t)mtree->set.gid);
	}
	if ((keys & effkeys & F_MODE) != 0) {
		mtree->set.mode = archive_entry_mode(entry) & 07777;
		archive_string_sprintf(&setstr, " mode=%o", mtree->set.mode);
	}
	if ((keys & effkeys & F_FLAGS) != 0) {
		if ((name = archive_entry_fflags_text(entry)) != NULL) {
			archive_strcat(&setstr, " flags=");
			mtree_quote(&setstr, name);
			archive_entry_fflags(entry, &mtree->set.fflags_set,
			    &mtree->set.fflags_clear);
		} else if ((oldkeys & F_FLAGS) != 0)
			archive_strcat(&unsetstr, " flags");
		else
			keys &= ~F_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.processed = 1;
	/* On directory-only mode, it is only once to write /set keyword. */
	if (mtree->dironly)
		mtree->set.output = 0;
}

static int
get_keys(struct mtree_writer *mtree, struct archive_entry *entry)
{
	int keys;

	keys = mtree->keys;
	if (mtree->set.keys == 0)
		return (keys);
	if ((mtree->set.keys & (F_GNAME | F_GID)) != 0 &&
	     mtree->set.gid == archive_entry_gid(entry))
		keys &= ~(F_GNAME | F_GID);
	if ((mtree->set.keys & (F_UNAME | F_UID)) != 0 &&
	     mtree->set.uid == archive_entry_uid(entry))
		keys &= ~(F_UNAME | F_UID);
	if (mtree->set.keys & F_FLAGS) {
		unsigned long set, clear;

		archive_entry_fflags(entry, &set, &clear);
		if (mtree->set.fflags_set == set &&
		    mtree->set.fflags_clear == clear)
			keys &= ~F_FLAGS;
	}
	if ((mtree->set.keys & F_MODE) != 0 &&
	     mtree->set.mode == (archive_entry_mode(entry) & 07777))
		keys &= ~F_MODE;

	switch (archive_entry_filetype(entry)) {
	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
archive_write_mtree_header(struct archive_write *a,
    struct archive_entry *entry)
{
	struct mtree_writer *mtree= a->format_data;
	struct archive_string *str;
	const char *path;

	mtree->entry = archive_entry_clone(entry);
	path = archive_entry_pathname(mtree->entry);

	if (mtree->first) {
		mtree->first = 0;
		archive_strcat(&mtree->buf, "#mtree\n");
	}
	if (mtree->set.output)
		set_global(mtree, entry);

	archive_string_empty(&mtree->ebuf);
	str = (mtree->indent)? &mtree->ebuf : &mtree->buf;
	if (!mtree->dironly || archive_entry_filetype(entry) == AE_IFDIR)
		mtree_quote(str, path);

	mtree->entry_bytes_remaining = archive_entry_size(entry);
	if ((mtree->keys & F_CKSUM) != 0 &&
	    archive_entry_filetype(entry) == AE_IFREG) {
		mtree->compute_sum |= F_CKSUM;
		mtree->crc = 0;
		mtree->crc_len = 0;
	} else
		mtree->compute_sum &= ~F_CKSUM;
#ifdef ARCHIVE_HAS_MD5
	if ((mtree->keys & F_MD5) != 0 &&
	    archive_entry_filetype(entry) == AE_IFREG) {
		mtree->compute_sum |= F_MD5;
		archive_md5_init(&mtree->md5ctx);
	} else
		mtree->compute_sum &= ~F_MD5;
#endif
#ifdef ARCHIVE_HAS_RMD160
	if ((mtree->keys & F_RMD160) != 0 &&
	    archive_entry_filetype(entry) == AE_IFREG) {
		mtree->compute_sum |= F_RMD160;
		archive_rmd160_init(&mtree->rmd160ctx);
	} else
		mtree->compute_sum &= ~F_RMD160;
#endif
#ifdef ARCHIVE_HAS_SHA1
	if ((mtree->keys & F_SHA1) != 0 &&
	    archive_entry_filetype(entry) == AE_IFREG) {
		mtree->compute_sum |= F_SHA1;
		archive_sha1_init(&mtree->sha1ctx);
	} else
		mtree->compute_sum &= ~F_SHA1;
#endif
#ifdef ARCHIVE_HAS_SHA256
	if ((mtree->keys & F_SHA256) != 0 &&
	    archive_entry_filetype(entry) == AE_IFREG) {
		mtree->compute_sum |= F_SHA256;
		archive_sha256_init(&mtree->sha256ctx);
	} else
		mtree->compute_sum &= ~F_SHA256;
#endif
#ifdef ARCHIVE_HAS_SHA384
	if ((mtree->keys & F_SHA384) != 0 &&
	    archive_entry_filetype(entry) == AE_IFREG) {
		mtree->compute_sum |= F_SHA384;
		archive_sha384_init(&mtree->sha384ctx);
	} else
		mtree->compute_sum &= ~F_SHA384;
#endif
#ifdef ARCHIVE_HAS_SHA512
	if ((mtree->keys & F_SHA512) != 0 &&
	    archive_entry_filetype(entry) == AE_IFREG) {
		mtree->compute_sum |= F_SHA512;
		archive_sha512_init(&mtree->sha512ctx);
	} else
		mtree->compute_sum &= ~F_SHA512;
#endif

	return (ARCHIVE_OK);
}

#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 int
archive_write_mtree_finish_entry(struct archive_write *a)
{
	struct mtree_writer *mtree = a->format_data;
	struct archive_entry *entry;
	struct archive_string *str;
	const char *name;
	int keys, ret;

	entry = mtree->entry;
	if (entry == NULL) {
		archive_set_error(&a->archive, ARCHIVE_ERRNO_PROGRAMMER,
		    "Finished entry without being open first.");
		return (ARCHIVE_FATAL);
	}
	mtree->entry = NULL;

	if (mtree->dironly && archive_entry_filetype(entry) != AE_IFDIR) {
		archive_entry_free(entry);
		return (ARCHIVE_OK);
	}

	str = (mtree->indent)? &mtree->ebuf : &mtree->buf;
	keys = get_keys(mtree, entry);
	if ((keys & F_NLINK) != 0 &&
	    archive_entry_nlink(entry) != 1 &&
	    archive_entry_filetype(entry) != AE_IFDIR)
		archive_string_sprintf(str,
		    " nlink=%u", archive_entry_nlink(entry));

	if ((keys & F_GNAME) != 0 &&
	    (name = archive_entry_gname(entry)) != NULL) {
		archive_strcat(str, " gname=");
		mtree_quote(str, name);
	}
	if ((keys & F_UNAME) != 0 &&
	    (name = archive_entry_uname(entry)) != NULL) {
		archive_strcat(str, " uname=");
		mtree_quote(str, name);
	}
	if ((keys & F_FLAGS) != 0 &&
	    (name = archive_entry_fflags_text(entry)) != NULL) {
		archive_strcat(str, " flags=");
		mtree_quote(str, name);
	}
	if ((keys & F_TIME) != 0)
		archive_string_sprintf(str, " time=%jd.%jd",
		    (intmax_t)archive_entry_mtime(entry),
		    (intmax_t)archive_entry_mtime_nsec(entry));
	if ((keys & F_MODE) != 0)
		archive_string_sprintf(str, " mode=%o",
		    archive_entry_mode(entry) & 07777);
	if ((keys & F_GID) != 0)
		archive_string_sprintf(str, " gid=%jd",
		    (intmax_t)archive_entry_gid(entry));
	if ((keys & F_UID) != 0)
		archive_string_sprintf(str, " uid=%jd",
		    (intmax_t)archive_entry_uid(entry));

	switch (archive_entry_filetype(entry)) {
	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, archive_entry_symlink(entry));
		}
		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,%d,%d",
			    archive_entry_rdevmajor(entry),
			    archive_entry_rdevminor(entry));
		}
		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,%d,%d",
			    archive_entry_rdevmajor(entry),
			    archive_entry_rdevminor(entry));
		}
		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)archive_entry_size(entry));
		break;
	}

	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);
		mtree->crc = ~mtree->crc;
		archive_string_sprintf(str, " cksum=%ju",
		    (uintmax_t)mtree->crc);
	}
#ifdef ARCHIVE_HAS_MD5
	if (mtree->compute_sum & F_MD5) {
		unsigned char buf[16];

		archive_md5_final(&mtree->md5ctx, buf);
		archive_strcat(str, " md5digest=");
		strappend_bin(str, buf, sizeof(buf));
	}
#endif
#ifdef ARCHIVE_HAS_RMD160
	if (mtree->compute_sum & F_RMD160) {
		unsigned char buf[20];

		archive_rmd160_final(&mtree->rmd160ctx, buf);
		archive_strcat(str, " rmd160digest=");
		strappend_bin(str, buf, sizeof(buf));
	}
#endif
#ifdef ARCHIVE_HAS_SHA1
	if (mtree->compute_sum & F_SHA1) {
		unsigned char buf[20];

		archive_sha1_final(&mtree->sha1ctx, buf);
		archive_strcat(str, " sha1digest=");
		strappend_bin(str, buf, sizeof(buf));
	}
#endif
#ifdef ARCHIVE_HAS_SHA256
	if (mtree->compute_sum & F_SHA256) {
		unsigned char buf[32];

		archive_sha256_final(&mtree->sha256ctx, buf);
		archive_strcat(str, " sha256digest=");
		strappend_bin(str, buf, sizeof(buf));
	}
#endif
#ifdef ARCHIVE_HAS_SHA384
	if (mtree->compute_sum & F_SHA384) {
		unsigned char buf[48];

		archive_sha384_final(&mtree->sha384ctx, buf);
		archive_strcat(str, " sha384digest=");
		strappend_bin(str, buf, sizeof(buf));
	}
#endif
#ifdef ARCHIVE_HAS_SHA512
	if (mtree->compute_sum & F_SHA512) {
		unsigned char buf[64];

		archive_sha512_final(&mtree->sha512ctx, buf);
		archive_strcat(str, " sha512digest=");
		strappend_bin(str, buf, sizeof(buf));
	}
#endif
	archive_strcat(str, "\n");
	if (mtree->indent)
		mtree_indent(mtree);

	archive_entry_free(entry);

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

	return (ret == ARCHIVE_OK ? ret : ARCHIVE_FATAL);
}

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

	archive_write_set_bytes_in_last_block(&a->archive, 1);

	return (a->compressor.write)(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 = mtree->entry_bytes_remaining;
	if (mtree->dironly)
		/* We don't need compute a regular file sum */
		return (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);
#endif
#ifdef ARCHIVE_HAS_RMD160
	if (mtree->compute_sum & F_RMD160)
		archive_rmd160_update(&mtree->rmd160ctx, buff, n);
#endif
#ifdef ARCHIVE_HAS_SHA1
	if (mtree->compute_sum & F_SHA1)
		archive_sha1_update(&mtree->sha1ctx, buff, n);
#endif
#ifdef ARCHIVE_HAS_SHA256
	if (mtree->compute_sum & F_SHA256)
		archive_sha256_update(&mtree->sha256ctx, buff, n);
#endif
#ifdef ARCHIVE_HAS_SHA384
	if (mtree->compute_sum & F_SHA384)
		archive_sha384_update(&mtree->sha384ctx, buff, n);
#endif
#ifdef ARCHIVE_HAS_SHA512
	if (mtree->compute_sum & F_SHA512)
		archive_sha512_update(&mtree->sha512ctx, buff, n);
#endif
	return (n);
}

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

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

	archive_entry_free(mtree->entry);
	archive_string_free(&mtree->ebuf);
	archive_string_free(&mtree->buf);
	archive_string_free(&mtree->set.parent);
	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);
		}
		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, "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->set.output = (value != NULL)? 1: 0;
			return (ARCHIVE_OK);
		}
		break;
	}
	if (keybit != 0) {
		if (value != NULL)
			mtree->keys |= keybit;
		else
			mtree->keys &= ~keybit;
		return (ARCHIVE_OK);
	}

	return (ARCHIVE_WARN);
}

int
archive_write_set_format_mtree(struct archive *_a)
{
	struct archive_write *a = (struct archive_write *)_a;
	struct mtree_writer *mtree;

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

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

	mtree->entry = NULL;
	mtree->first = 1;
	memset(&(mtree->set), 0, sizeof(mtree->set));
	archive_string_init(&mtree->set.parent);
	mtree->keys = DEFAULT_KEYS;
	mtree->dironly = 0;
	mtree->indent = 0;
	archive_string_init(&mtree->ebuf);
	archive_string_init(&mtree->buf);
	a->format_data = mtree;
	a->format_destroy = archive_write_mtree_destroy;

	a->pad_uncompressed = 0;
	a->format_name = "mtree";
	a->format_options = archive_write_mtree_options;
	a->format_write_header = archive_write_mtree_header;
	a->format_finish = archive_write_mtree_finish;
	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);
}