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/*
mkexfat.c (22.04.12)
FS creation engine.
Free exFAT implementation.
Copyright (C) 2011-2013 Andrew Nayenko
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <sys/types.h>
#include <unistd.h>
#include <inttypes.h>
#include <stdio.h>
#include <string.h>
#include "mkexfat.h"
static int check_size(off64_t volume_size)
{
const struct fs_object** pp;
off64_t position = 0;
for (pp = objects; *pp; pp++)
{
position = ROUND_UP(position, (*pp)->get_alignment());
position += (*pp)->get_size();
}
if (position > volume_size)
{
struct exfat_human_bytes vhb;
exfat_humanize_bytes(volume_size, &vhb);
exfat_error("too small device (%"PRIu64" %s)", vhb.value, vhb.unit);
return 1;
}
return 0;
}
static int erase_object(struct exfat_dev* dev, const void* block,
size_t block_size, off64_t start, off64_t size)
{
const off64_t block_count = DIV_ROUND_UP(size, block_size);
off64_t i;
if (exfat_seek(dev, start, SEEK_SET) == (off64_t) -1)
{
exfat_error("seek to 0x%"PRIx64" failed", start);
return 1;
}
for (i = 0; i < size; i += block_size)
{
if (exfat_write(dev, block, MIN(size - i, block_size)) < 0)
{
exfat_error("failed to erase block %"PRIu64"/%"PRIu64
" at 0x%"PRIx64, i + 1, block_count, start);
return 1;
}
}
return 0;
}
static int erase(struct exfat_dev* dev)
{
const struct fs_object** pp;
off64_t position = 0;
const size_t block_size = 1024 * 1024;
void* block = malloc(block_size);
if (block == NULL)
{
exfat_error("failed to allocate erase block of %zu bytes", block_size);
return 1;
}
memset(block, 0, block_size);
for (pp = objects; *pp; pp++)
{
position = ROUND_UP(position, (*pp)->get_alignment());
if (erase_object(dev, block, block_size, position,
(*pp)->get_size()) != 0)
{
free(block);
return 1;
}
position += (*pp)->get_size();
}
free(block);
return 0;
}
static int create(struct exfat_dev* dev)
{
const struct fs_object** pp;
off64_t position = 0;
for (pp = objects; *pp; pp++)
{
position = ROUND_UP(position, (*pp)->get_alignment());
if (exfat_seek(dev, position, SEEK_SET) == (off64_t) -1)
{
exfat_error("seek to 0x%"PRIx64" failed", position);
return 1;
}
if ((*pp)->write(dev) != 0)
return 1;
position += (*pp)->get_size();
}
return 0;
}
int mkfs(struct exfat_dev* dev, off64_t volume_size)
{
if (check_size(volume_size) != 0)
return 1;
fputs("Creating... ", stdout);
fflush(stdout);
if (erase(dev) != 0)
return 1;
if (create(dev) != 0)
return 1;
puts("done.");
fputs("Flushing... ", stdout);
fflush(stdout);
if (exfat_fsync(dev) != 0)
return 1;
puts("done.");
return 0;
}
off64_t get_position(const struct fs_object* object)
{
const struct fs_object** pp;
off64_t position = 0;
for (pp = objects; *pp; pp++)
{
position = ROUND_UP(position, (*pp)->get_alignment());
if (*pp == object)
return position;
position += (*pp)->get_size();
}
exfat_bug("unknown object");
}
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