ext4_mbr: initial MBR parser code

2 files changed, 131 insertions, 0 deletions

diff --git a/lwext4/ext4_mbr.c b/lwext4/ext4_mbr.c
new file mode 100644
index 0000000..30a8e67
--- /dev/null
+++ b/lwext4/ext4_mbr.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2015 Grzegorz Kostka (kostka.grzegorz@gmail.com)
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup lwext4
+ * @{
+ */
+/**
+ * @file  ext4_mbr.c
+ * @brief Master boot record parser
+ */
+
+#include "ext4_config.h"
+#include "ext4_mbr.h"
+
+#define MBR_SIGNATURE 0xAA55
+
+struct ext4_part_entry {
+	uint8_t status;
+	uint8_t chs1[3];
+	uint8_t type;
+	uint8_t chs2[3];
+	uint32_t first_lba;
+	uint32_t sectors;
+} __attribute__((packed));
+
+struct ext4_mbr {
+	uint8_t bootstrap[446];
+	struct ext4_part_entry part_entry[4];
+	uint16_t signature;
+} __attribute__((packed));
+
+
+/**
+ * @}
+ */
+
diff --git a/lwext4/ext4_mbr.h b/lwext4/ext4_mbr.h
new file mode 100644
index 0000000..b71a741
--- /dev/null
+++ b/lwext4/ext4_mbr.h
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2015 Grzegorz Kostka (kostka.grzegorz@gmail.com)
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup lwext4
+ * @{
+ */
+/**
+ * @file  ext4_mbr.h
+ * @brief Master boot record parser
+ */
+
+#ifndef EXT4_MBR_H_
+#define EXT4_MBR_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ext4_config.h"
+#include "ext4_blockdev.h"
+
+/**@brief Master boot record block devices descriptor*/
+struct ext4_mbr_bdevs {
+	uint32_t cnt;
+	struct ext4_blockdev partitions[4];
+};
+
+int ext4_mbr_scan(struct ext4_blockdev *parent, struct ext4_mbr_bdevs *bdevs);
+
+/**@brief Master boot record partitions*/
+struct ext4_mbr_parts {
+	uint64_t size[4];
+};
+
+int ext4_mbr_write(struct ext4_blockdev *parent, struct ext4_mbr_parts *parts);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* EXT4_MBR_H_ */
+
+/**
+ * @}
+ */