/*-
 * Copyright (c) 2012 Department of Software Engineering,
 *                    University of Szeged, Hungary
 * Copyright (c) 2012 Tamas Toth <ttoth@inf.u-szeged.hu>
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by the Department of Software Engineering, University of Szeged, Hungary
 *
 * 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.
 */

#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

#include <sys/param.h>
#if defined(HAVE_SYS_ENDIAN_H) || !defined(HAVE_NBTOOL_CONFIG_H)
#include <sys/endian.h>
#endif
#include <sys/stat.h>

#include <assert.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <zlib.h>
#include <util.h>
#include <unistd.h>

#include "makefs.h"
#include "chfs_makefs.h"

#include "media.h"
#include "ebh.h"

#include "chfs/chfs_mkfs.h"

static uint32_t img_ofs = 0;
static uint64_t version = 0;
static uint64_t max_serial = 0;
static int lebnumber = 0;

static const unsigned char ffbuf[16] = {
        0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
        0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
};

static void
buf_write(fsinfo_t *fsopts, const void *buf, size_t len)
{
        ssize_t retval;
        const char *charbuf = buf;

        while (len > 0) {
                retval = write(fsopts->fd, charbuf, len);

                if (retval == -1) {
                        err(EXIT_FAILURE, "ERROR while writing");
                }

                len -= retval;
                charbuf += retval;
                img_ofs += retval;
        }
}

void
padblock(fsinfo_t *fsopts)
{
        chfs_opt_t *chfs_opts = fsopts->fs_specific;
        while (img_ofs % chfs_opts->eraseblock) {
                buf_write(fsopts, ffbuf, MIN(sizeof(ffbuf),
                    chfs_opts->eraseblock - (img_ofs % chfs_opts->eraseblock)));
        }
}

static void
padword(fsinfo_t *fsopts)
{
        if (img_ofs % 4) {
                buf_write(fsopts, ffbuf, 4 - img_ofs % 4);
        }
}

static void
pad_block_if_less_than(fsinfo_t *fsopts, int req)
{
        chfs_opt_t *chfs_opts = fsopts->fs_specific;
        if ((img_ofs % chfs_opts->eraseblock) + req >
            (uint32_t)chfs_opts->eraseblock) {
                padblock(fsopts);
                write_eb_header(fsopts);
        }
}

void
write_eb_header(fsinfo_t *fsopts)
{
        chfs_opt_t *opts;
        struct chfs_eb_hdr ebhdr;
        char *buf;

        opts = fsopts->fs_specific;

#define MINSIZE MAX(MAX(CHFS_EB_EC_HDR_SIZE, CHFS_EB_HDR_NOR_SIZE), \
    CHFS_EB_HDR_NAND_SIZE)
        if ((uint32_t)opts->pagesize < MINSIZE)
                errx(EXIT_FAILURE, "pagesize cannot be less than %zu", MINSIZE);
        buf = emalloc(opts->pagesize);

        ebhdr.ec_hdr.magic = htole32(CHFS_MAGIC_BITMASK);
        ebhdr.ec_hdr.erase_cnt = htole32(1);
        ebhdr.ec_hdr.crc_ec = htole32(crc32(0,
            (uint8_t *)&ebhdr.ec_hdr + 8, 4));

        memcpy(buf, &ebhdr.ec_hdr, CHFS_EB_EC_HDR_SIZE);
        memset(buf + CHFS_EB_EC_HDR_SIZE, 0xFF,
            opts->pagesize - CHFS_EB_EC_HDR_SIZE);

        buf_write(fsopts, buf, opts->pagesize);

        memset(buf, 0xFF, opts->pagesize);

        if (opts->mediatype == TYPE_NAND) {
                ebhdr.u.nand_hdr.lid = htole32(lebnumber++);
                ebhdr.u.nand_hdr.serial = htole64(++(max_serial));
                ebhdr.u.nand_hdr.crc = htole32(crc32(0,
                    (uint8_t *)&ebhdr.u.nand_hdr + 4,
                    CHFS_EB_HDR_NAND_SIZE - 4));
                memcpy(buf, &ebhdr.u.nand_hdr, CHFS_EB_HDR_NAND_SIZE);
        } else {
                ebhdr.u.nor_hdr.lid = htole32(lebnumber++);
                ebhdr.u.nor_hdr.crc = htole32(crc32(0,
                    (uint8_t *)&ebhdr.u.nor_hdr + 4,
                    CHFS_EB_HDR_NOR_SIZE - 4));
                memcpy(buf, &ebhdr.u.nor_hdr, CHFS_EB_HDR_NOR_SIZE);
        }

        buf_write(fsopts, buf, opts->pagesize);
        free(buf);
}

void
write_vnode(fsinfo_t *fsopts, fsnode *node)
{
        struct chfs_flash_vnode fvnode;
        memset(&fvnode, 0, sizeof(fvnode));

        fvnode.magic = htole16(CHFS_FS_MAGIC_BITMASK);
        fvnode.type = htole16(CHFS_NODETYPE_VNODE);
        fvnode.length = htole32(CHFS_PAD(sizeof(fvnode)));
        fvnode.hdr_crc = htole32(crc32(0, (uint8_t *)&fvnode,
            CHFS_NODE_HDR_SIZE - 4));
        fvnode.vno = htole64(node->inode->ino);
        fvnode.version = htole64(version++);
        fvnode.mode = htole32(node->inode->st.st_mode);
        fvnode.dn_size = htole32(node->inode->st.st_size);
        fvnode.atime = htole32(node->inode->st.st_atime);
        fvnode.ctime = htole32(node->inode->st.st_ctime);
        fvnode.mtime = htole32(node->inode->st.st_mtime);
        fvnode.gid = htole32(node->inode->st.st_uid);
        fvnode.uid = htole32(node->inode->st.st_gid);
        fvnode.node_crc = htole32(crc32(0, (uint8_t *)&fvnode,
            sizeof(fvnode) - 4));

        pad_block_if_less_than(fsopts, sizeof(fvnode));
        buf_write(fsopts, &fvnode, sizeof(fvnode));
        padword(fsopts);
}

void
write_dirent(fsinfo_t *fsopts, fsnode *node)
{
        struct chfs_flash_dirent_node fdirent;
        char *name;

        name = emalloc(strlen(node->name));
        memcpy(name, node->name, strlen(node->name));

        memset(&fdirent, 0, sizeof(fdirent));
        fdirent.magic = htole16(CHFS_FS_MAGIC_BITMASK);
        fdirent.type = htole16(CHFS_NODETYPE_DIRENT);
        fdirent.length = htole32(CHFS_PAD(sizeof(fdirent) + strlen(name)));
        fdirent.hdr_crc = htole32(crc32(0, (uint8_t *)&fdirent,
            CHFS_NODE_HDR_SIZE - 4));
        fdirent.vno = htole64(node->inode->ino);
        if (node->parent != NULL) {
                fdirent.pvno = htole64(node->parent->inode->ino);
        } else {
                fdirent.pvno = htole64(node->inode->ino);
        }

        fdirent.version = htole64(version++);
        fdirent.mctime = 0;
        fdirent.nsize = htole32(strlen(name));
        fdirent.dtype = htole32(IFTOCHT(node->type & S_IFMT));
        fdirent.name_crc = htole32(crc32(0, (uint8_t *)name, fdirent.nsize));
        fdirent.node_crc = htole32(crc32(0, (uint8_t *)&fdirent,
            sizeof(fdirent) - 4));

        pad_block_if_less_than(fsopts, sizeof(fdirent) + fdirent.nsize);
        buf_write(fsopts, &fdirent, sizeof(fdirent));
        buf_write(fsopts, name, fdirent.nsize);
        padword(fsopts);
}

void
write_file(fsinfo_t *fsopts, fsnode *node, const char *dir)
{
        int fd;
        ssize_t len;
        char *name = node->name;
        chfs_opt_t *opts;
        unsigned char *buf;
        uint32_t fileofs = 0;

        opts = fsopts->fs_specific;
        buf = emalloc(opts->pagesize);
        if (node->type == S_IFREG || node->type == S_IFSOCK) {
                char *longname;
                if (asprintf(&longname, "%s/%s", dir, name) == 1)
                        goto out;

                fd = open(longname, O_RDONLY, 0444);
                if (fd == -1)
                        err(EXIT_FAILURE, "Cannot open `%s'", longname);

                while ((len = read(fd, buf, opts->pagesize))) {
                        if (len < 0) {
                                warn("ERROR while reading %s", longname);
                                free(longname);
                                free(buf);
                                close(fd);
                                return;
                        }

                        write_data(fsopts, node, buf, len, fileofs);
                        fileofs += len;
                }
                free(longname);
                close(fd);
        } else if (node->type == S_IFLNK) {
                len = strlen(node->symlink);
                memcpy(buf, node->symlink, len);
                write_data(fsopts, node, buf, len, 0);
        } else if (node->type == S_IFCHR || node->type == S_IFBLK ||
                node->type == S_IFIFO) {
                len = sizeof(dev_t);
                memcpy(buf, &(node->inode->st.st_rdev), len);
                write_data(fsopts, node, buf, len, 0);
        }

        free(buf);
        return;
out:
        err(EXIT_FAILURE, "Memory allocation failed");
}

void
write_data(fsinfo_t *fsopts, fsnode *node, unsigned char *buf, size_t len,
    uint32_t ofs)
{
        struct chfs_flash_data_node fdata;

        memset(&fdata, 0, sizeof(fdata));
        if (len == 0) {
                return;
        }

        pad_block_if_less_than(fsopts, sizeof(fdata) + len);

        fdata.magic = htole16(CHFS_FS_MAGIC_BITMASK);
        fdata.type = htole16(CHFS_NODETYPE_DATA);
        fdata.length = htole32(CHFS_PAD(sizeof(fdata) + len));
        fdata.hdr_crc = htole32(crc32(0, (uint8_t *)&fdata,
            CHFS_NODE_HDR_SIZE - 4));
        fdata.vno = htole64(node->inode->ino);
        fdata.data_length = htole32(len);
        fdata.offset = htole32(ofs);
        fdata.data_crc = htole32(crc32(0, (uint8_t *)buf, len));
        fdata.node_crc = htole32(crc32(0,
            (uint8_t *)&fdata, sizeof(fdata) - 4));

        buf_write(fsopts, &fdata, sizeof(fdata));
        buf_write(fsopts, buf, len);
        padword(fsopts);
}