X-Git-Url: https://git.sven.stormbind.net/?p=sven%2Fexfat-utils.git;a=blobdiff_plain;f=mkfs%2Ffat.c;h=bdd99411e834c8be2b57ca1e3871d39e89d9df33;hp=7baa57393be0f678df52248835398ed0ef10c210;hb=70a4b10edcf53a90140e6dd80ccaa045f3647ad7;hpb=4cb393cfd9b0ab69392612521ee3dbe481ec492d

diff --git a/mkfs/fat.c b/mkfs/fat.c
index 7baa573..bdd9941 100644
--- a/mkfs/fat.c
+++ b/mkfs/fat.c
@@ -2,7 +2,7 @@
 	fat.c (09.11.10)
 	File Allocation Table creation code.
 
-	Copyright (C) 2009, 2010  Andrew Nayenko
+	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
@@ -19,62 +19,68 @@
 */
 
 #include <unistd.h>
-#include <inttypes.h>
-#include <errno.h>
-#include "mkexfat.h"
+#include "fat.h"
 #include "cbm.h"
 #include "uct.h"
 #include "rootdir.h"
 
-off_t fat_alignment(void)
+static off_t fat_alignment(void)
 {
-	return (off_t) le32_to_cpu(sb.fat_sector_start) * SECTOR_SIZE(sb);
+	return (off_t) 128 * get_sector_size();
 }
 
-off_t fat_size(void)
+static off_t fat_size(void)
 {
-	return (off_t) le32_to_cpu(sb.fat_sector_count) * SECTOR_SIZE(sb);
+	return get_volume_size() / get_cluster_size() * sizeof(cluster_t);
 }
 
-static cluster_t fat_write_entry(cluster_t cluster, cluster_t value, int fd)
+static cluster_t fat_write_entry(struct exfat_dev* dev, cluster_t cluster,
+		cluster_t value)
 {
 	le32_t fat_entry = cpu_to_le32(value);
-	if (write(fd, &fat_entry, sizeof(fat_entry)) == -1)
+	if (exfat_write(dev, &fat_entry, sizeof(fat_entry)) < 0)
+	{
+		exfat_error("failed to write FAT entry 0x%x", value);
 		return 0;
+	}
 	return cluster + 1;
 }
 
-static cluster_t fat_write_entries(cluster_t cluster, uint64_t length, int fd)
+static cluster_t fat_write_entries(struct exfat_dev* dev, cluster_t cluster,
+		uint64_t length)
 {
-	cluster_t end = cluster + DIV_ROUND_UP(length, CLUSTER_SIZE(sb));
+	cluster_t end = cluster + DIV_ROUND_UP(length, get_cluster_size());
 
 	while (cluster < end - 1)
 	{
-		cluster = fat_write_entry(cluster, cluster + 1, fd);
+		cluster = fat_write_entry(dev, cluster, cluster + 1);
 		if (cluster == 0)
 			return 0;
 	}
-	return fat_write_entry(cluster, EXFAT_CLUSTER_END, fd);
+	return fat_write_entry(dev, cluster, EXFAT_CLUSTER_END);
 }
 
-int fat_write(off_t base, int fd)
+static int fat_write(struct exfat_dev* dev)
 {
 	cluster_t c = 0;
 
-	if (base != le32_to_cpu(sb.fat_sector_start) * SECTOR_SIZE(sb))
-		exfat_bug("unexpected FAT location: %"PRIu64" (expected %u)",
-				base, le32_to_cpu(sb.fat_sector_start) * SECTOR_SIZE(sb));
-
-	if (!(c = fat_write_entry(c, 0xfffffff8, fd))) /* media type */
-		return errno;
-	if (!(c = fat_write_entry(c, 0xffffffff, fd))) /* some weird constant */
-		return errno;
-	if (!(c = fat_write_entries(c, cbm_size(), fd)))
-		return errno;
-	if (!(c = fat_write_entries(c, uct_size(), fd)))
-		return errno;
-	if (!(c = fat_write_entries(c, rootdir_size(), fd)))
-		return errno;
+	if (!(c = fat_write_entry(dev, c, 0xfffffff8))) /* media type */
+		return 1;
+	if (!(c = fat_write_entry(dev, c, 0xffffffff))) /* some weird constant */
+		return 1;
+	if (!(c = fat_write_entries(dev, c, cbm.get_size())))
+		return 1;
+	if (!(c = fat_write_entries(dev, c, uct.get_size())))
+		return 1;
+	if (!(c = fat_write_entries(dev, c, rootdir.get_size())))
+		return 1;
 
 	return 0;
 }
+
+const struct fs_object fat =
+{
+	.get_alignment = fat_alignment,
+	.get_size = fat_size,
+	.write = fat_write,
+};