X-Git-Url: http://git.sven.stormbind.net/?p=sven%2Fexfat-utils.git;a=blobdiff_plain;f=mkfs%2Fmkexfat.c;fp=mkfs%2Fmkexfat.c;h=aaf2c42bb05f7d6cee34924980495580b7a3249c;hp=0000000000000000000000000000000000000000;hb=70a4b10edcf53a90140e6dd80ccaa045f3647ad7;hpb=9799d681703e3a63dbbf876c16c9bb51b20c8fab

diff --git a/mkfs/mkexfat.c b/mkfs/mkexfat.c
new file mode 100644
index 0000000..aaf2c42
--- /dev/null
+++ b/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(off_t volume_size)
+{
+	const struct fs_object** pp;
+	off_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, off_t start, off_t size)
+{
+	const off_t block_count = DIV_ROUND_UP(size, block_size);
+	off_t i;
+
+	if (exfat_seek(dev, start, SEEK_SET) == (off_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;
+	off_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;
+	off_t position = 0;
+
+	for (pp = objects; *pp; pp++)
+	{
+		position = ROUND_UP(position, (*pp)->get_alignment());
+		if (exfat_seek(dev, position, SEEK_SET) == (off_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, off_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;
+}
+
+off_t get_position(const struct fs_object* object)
+{
+	const struct fs_object** pp;
+	off_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");
+}