/*-
 * 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("$FreeBSD$");

#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;
        int 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);
}
