/*-
* Copyright (c) 2012 Department of Software Engineering,
*                    University of Szeged, Hungary
* Copyright (c) 2012 Tamas Toth <[email protected]>
* 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>
#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);
}

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