/*-
 * Copyright (c) 2002 Marcel Moolenaar
 * 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 ``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 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.
 *
 * $FreeBSD: src/sbin/gpt/add.c,v 1.15 2006/10/04 18:20:25 marcel Exp $
 */

#include <sys/param.h>

#include <err.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "gpt.h"

static uuid_t type;
static off_t block, size, alignment;
static unsigned int entry = MAP_NOENTRY;
static const char *name;

static void
usage_add(void)
{
        fprintf(stderr,
                "usage: %s [-a alignment] [-b block] [-i index] [-l label] "
                "[-s size] [-t uuid/alias] device ...\n",
                getprogname());
        exit(1);
}

static void
add(int fd)
{
        map_t *gpt, *tpg;
        map_t *tbl, *lbt;
        map_t *map;
        struct gpt_hdr *hdr;
        struct gpt_ent *ent;
        unsigned int i;

        if (alignment == 0)
                alignment = (off_t)1024 * 1024 / secsz; /* 1MB */

        gpt = map_find(MAP_TYPE_GPT_PRI_HDR);
        if (gpt == NULL) {
                warnx("%s: error: no primary GPT header; run create or recover",
                    device_name);
                return;
        }

        tpg = map_find(MAP_TYPE_GPT_SEC_HDR);
        if (tpg == NULL) {
                warnx("%s: error: no secondary GPT header; run recover",
                    device_name);
                return;
        }

        tbl = map_find(MAP_TYPE_GPT_PRI_TBL);
        lbt = map_find(MAP_TYPE_GPT_SEC_TBL);
        if (tbl == NULL || lbt == NULL) {
                warnx("%s: error: run recover -- trust me", device_name);
                return;
        }

        hdr = gpt->map_data;
        if (entry != MAP_NOENTRY && entry > le32toh(hdr->hdr_entries)) {
                warnx("%s: error: index %u out of range (%u max)", device_name,
                    entry, le32toh(hdr->hdr_entries));
                return;
        }

        if (entry != MAP_NOENTRY) {
                i = entry;
                ent = (void *)((char *)tbl->map_data + i *
                    le32toh(hdr->hdr_entsz));
                if (!uuid_is_nil(&ent->ent_type, NULL)) {
                        warnx("%s: error: entry at index %u is not free",
                            device_name, entry);
                        return;
                }
        } else {
                /* Find empty slot in GPT table. */
                ent = NULL;
                for (i = 0; i < le32toh(hdr->hdr_entries); i++) {
                        ent = (void *)((char *)tbl->map_data + i *
                            le32toh(hdr->hdr_entsz));
                        if (uuid_is_nil(&ent->ent_type, NULL))
                                break;
                }
                if (i == le32toh(hdr->hdr_entries)) {
                        warnx("%s: error: no available table entries",
                            device_name);
                        return;
                }
        }

        map = map_alloc(block, size, alignment);
        if (map == NULL) {
                warnx("%s: error: no space available on device", device_name);
                return;
        }

        uuid_enc_le(&ent->ent_type, &type);
        ent->ent_lba_start = htole64(map->map_start);
        ent->ent_lba_end = htole64(map->map_start + map->map_size - 1LL);
        if (name != NULL)
                utf8_to_utf16(name, ent->ent_name, NELEM(ent->ent_name));

        hdr->hdr_crc_table = htole32(crc32(tbl->map_data,
            le32toh(hdr->hdr_entries) * le32toh(hdr->hdr_entsz)));
        hdr->hdr_crc_self = 0;
        hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));

        gpt_write(fd, gpt);
        gpt_write(fd, tbl);

        hdr = tpg->map_data;
        ent = (void*)((char*)lbt->map_data + i * le32toh(hdr->hdr_entsz));

        uuid_enc_le(&ent->ent_type, &type);
        ent->ent_lba_start = htole64(map->map_start);
        ent->ent_lba_end = htole64(map->map_start + map->map_size - 1LL);
        if (name != NULL)
                utf8_to_utf16(name, ent->ent_name, NELEM(ent->ent_name));

        hdr->hdr_crc_table = htole32(crc32(lbt->map_data,
            le32toh(hdr->hdr_entries) * le32toh(hdr->hdr_entsz)));
        hdr->hdr_crc_self = 0;
        hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));

        gpt_write(fd, lbt);
        gpt_write(fd, tpg);

        printf("%ss%u added\n", device_name, i);
}

void
add_defaults(int fd)
{
        entry = 0;
        size = (off_t)256 * 1024 * 1024 / secsz; /* 256MB */
        type = (uuid_t)GPT_ENT_TYPE_EFI;
        add(fd);

        entry = 1;
        size = 0; /* all free space */
        type = (uuid_t)GPT_ENT_TYPE_DRAGONFLY_LABEL64;
        add(fd);
}

static int64_t
parse_number(const char *s)
{
        int64_t v;
        char *suffix;

        v = (int64_t)strtol(s, &suffix, 0);
        if (suffix == s)
                return (-1);
        if (*suffix == '\0')
                return (v);
        if (suffix[1] != '\0')
                return (-1);

        switch (*suffix) {
        case 'g':
        case 'G':
                v *= 1024;
                /* FALLTHROUGH */
        case 'm':
        case 'M':
                v *= 1024;
                /* FALLTHROUGH */
        case 'k':
        case 'K':
                v *= 1024;
                break;
        default:
                return (-1);
        }

        return (v);
}

static int64_t
parse_size(const char *s, bool *is_sector)
{
        int64_t v;
        char *suffix;

        v = (int64_t)strtol(s, &suffix, 0);
        if (suffix == s)
                return (-1);
        if (*suffix == '\0') {
                *is_sector = true;
                return (v);
        }
        if (suffix[1] != '\0')
                return (-1);

        switch (*suffix) {
        case 's':
        case 'S':
                *is_sector = true;
                break;
        case 'p':
        case 'P':
                v *= 1024;
                /* FALLTHROUGH */
        case 't':
        case 'T':
                v *= 1024;
                /* FALLTHROUGH */
        case 'g':
        case 'G':
                v *= 1024;
                /* FALLTHROUGH */
        case 'm':
        case 'M':
                v *= 1024;
                /* FALLTHROUGH */
        case 'k':
        case 'K':
                v *= 1024;
                /* FALLTHROUGH */
        case 'b':
        case 'B':
                *is_sector = false;
                break;
        default:
                return (-1);
        }

        return (v);
}

int
cmd_add(int argc, char *argv[])
{
        char *p;
        int ch, fd;
        bool is_sector;
        int64_t v;

        is_sector = false;
        type = (uuid_t)GPT_ENT_TYPE_DRAGONFLY_LABEL64;

        while ((ch = getopt(argc, argv, "a:b:hi:l:s:t:")) != -1) {
                switch(ch) {
                case 'a':
                        if (alignment > 0)
                                errx(1, "-a alignment already specified");
                        v = parse_number(optarg);
                        if (v < 0)
                                errx(1, "invalid alignment: %s", optarg);
                        alignment = (off_t)v;
                        break;
                case 'b':
                        if (block > 0)
                                errx(1, "-b block already specified");
                        block = strtoll(optarg, &p, 10);
                        if (*p != 0 || block < 1)
                                errx(1, "invalid block: %s", optarg);
                        break;
                case 'i':
                        if (entry != MAP_NOENTRY)
                                errx(1, "-i index already specified");
                        entry = strtoul(optarg, &p, 10);
                        if (*p != 0 || entry == MAP_NOENTRY)
                                errx(1, "invalid entry: %s", optarg);
                        break;
                case 'l':
                        name = optarg;
                        break;
                case 's':
                        if (size > 0)
                                errx(1, "-s size already specified");
                        v = parse_size(optarg, &is_sector);
                        if (v < 0)
                                errx(1, "invalid size: %s", optarg);
                        size = (off_t)v;
                        break;
                case 't':
                        if (parse_uuid(optarg, &type) != 0)
                                errx(1, "invalid type: %s", optarg);
                        break;
                case 'h':
                default:
                        usage_add();
                }
        }

        if (argc == optind)
                usage_add();

        while (optind < argc) {
                fd = gpt_open(argv[optind++]);
                if (fd == -1) {
                        warn("unable to open device '%s'", device_name);
                        continue;
                }

                if (alignment > 0) {
                        if (alignment % secsz != 0)
                                warnx("alignment (%ju) not multiple of "
                                      "sector size (%u)",
                                      (uintmax_t)alignment, secsz);
                        alignment = (alignment + secsz - 1) / secsz;
                }
                if (size > 0 && !is_sector) {
                        if (size % secsz != 0)
                                warnx("size (%ju) not multiple of "
                                      "sector size (%u)",
                                      (uintmax_t)size, secsz);
                        size = (size + secsz - 1) / secsz;
                }

                add(fd);

                gpt_close(fd);
        }

        return (0);
}