X-Git-Url: https://git.sven.stormbind.net/?a=blobdiff_plain;f=dump%2Fdump.c;h=8c9637616a6cbce1f7679ea02f675b7200be81bd;hb=fa2bead8d3f2203fb7b22d801443109a52808490;hp=85d5101f40e8653d193d32e4304390aa5902c9f5;hpb=37cbd64649f64ddb88b4ab3d8a494ddf96890cf8;p=sven%2Fexfatprogs.git

diff --git a/dump/dump.c b/dump/dump.c
index 85d5101..8c96376 100644
--- a/dump/dump.c
+++ b/dump/dump.c
@@ -76,20 +76,26 @@ static int exfat_show_ondisk_all_info(struct exfat_blk_dev *bd)
 	unsigned char *bitmap;
 	char *volume_label;
 
-	ppbr = malloc(bd->sector_size);
+	ppbr = malloc(EXFAT_MAX_SECTOR_SIZE);
 	if (!ppbr) {
 		exfat_err("Cannot allocate pbr: out of memory\n");
 		return -ENOMEM;
 	}
 
 	/* read main boot sector */
-	ret = exfat_read_sector(bd, (char *)ppbr, BOOT_SEC_IDX);
-	if (ret < 0) {
+	if (exfat_read(bd->dev_fd, (char *)ppbr, EXFAT_MAX_SECTOR_SIZE,
+			0) != (ssize_t)EXFAT_MAX_SECTOR_SIZE) {
 		exfat_err("main boot sector read failed\n");
 		ret = -EIO;
 		goto free_ppbr;
 	}
 
+	if (memcmp(ppbr->bpb.oem_name, "EXFAT   ", 8) != 0) {
+		exfat_err("Bad fs_name in boot sector, which does not describe a valid exfat filesystem\n");
+		ret = -EINVAL;
+		goto free_ppbr;
+	}
+
 	pbsx = &ppbr->bsx;
 
 	if (pbsx->sect_size_bits < EXFAT_MIN_SECT_SIZE_BITS ||
@@ -107,12 +113,8 @@ static int exfat_show_ondisk_all_info(struct exfat_blk_dev *bd)
 		goto free_ppbr;
 	}
 
-	if (bd->sector_size != 1 << pbsx->sect_size_bits) {
-		exfat_err("bogus sector size : %u (sector size bits : %u)\n",
-				bd->sector_size, pbsx->sect_size_bits);
-		ret = -EINVAL;
-		goto free_ppbr;
-	}
+	bd->sector_size_bits = pbsx->sect_size_bits;
+	bd->sector_size = 1 << pbsx->sect_size_bits;
 
 	clu_offset = le32_to_cpu(pbsx->clu_offset);
 	total_clus = le32_to_cpu(pbsx->clu_count);
@@ -221,6 +223,7 @@ int main(int argc, char *argv[])
 	bool version_only = false;
 
 	init_user_input(&ui);
+	ui.writeable = false;
 
 	if (!setlocale(LC_CTYPE, ""))
 		exfat_err("failed to init locale/codeset\n");