diff options
Diffstat (limited to 'exfat/mkfs/mkexfat.c')
| -rw-r--r-- | exfat/mkfs/mkexfat.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/exfat/mkfs/mkexfat.c b/exfat/mkfs/mkexfat.c new file mode 100644 index 000000000..7018aaae2 --- /dev/null +++ b/exfat/mkfs/mkexfat.c @@ -0,0 +1,160 @@ +/* + mkexfat.c (22.04.12) + FS creation engine. + + Copyright (C) 2011, 2012 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 3 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, see <http://www.gnu.org/licenses/>. +*/ + +#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"); +} |