From e7b4ff9317fc4e551cf974684eaa88697de5a28d Mon Sep 17 00:00:00 2001
From: srs5694 <srs5694@users.sourceforge.net>
Date: Tue, 18 Aug 2009 13:16:10 -0400
Subject: Initial git repository creation, version 0.3.1 plus changes

---
 mbr.h | 95 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 mbr.h

(limited to 'mbr.h')

diff --git a/mbr.h b/mbr.h
new file mode 100644
index 0000000..86f792b
--- /dev/null
+++ b/mbr.h
@@ -0,0 +1,95 @@
+/* mbr.h -- MBR data structure definitions, types, and functions */
+
+#include <stdint.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
+
+#ifndef __MBRSTRUCTS
+#define __MBRSTRUCTS
+
+#define MBR_SIGNATURE UINT16_C(0xAA55)
+
+// Maximum number of logical partitions supported
+#define NUM_LOGICALS 124
+
+using namespace std;
+
+/****************************************
+ *                                      *
+ * MBRData class and related structures *
+ *                                      *
+ ****************************************/
+
+// Data for a single MBR partition record
+// Note that firstSector and lastSector are in CHS addressing, which
+// splits the bits up in a weird way.
+struct MBRRecord {
+   uint8_t status;
+   uint8_t firstSector[3];
+   uint8_t partitionType;
+   uint8_t lastSector[3];
+   uint32_t firstLBA;
+   uint32_t lengthLBA;
+}; // struct MBRRecord
+
+// Extended Boot Record (EBR) data, used to hold one logical partition's
+// data within an extended partition. Includes pointer to next record for
+// in-memory linked-list access. This is similar to MBRData, but with a
+// few tweaks....
+struct EBRRecord {
+   uint8_t code[446]; // generally 0s (and we don't care if they aren't)
+   // First partition entry defines partition; second points to next
+   // entry in on-disk linked list; remaining two are unused. Note that
+   // addresses are relative to the extended partition, not to the disk
+   // as a whole.
+   struct MBRRecord partitions[4];
+   uint16_t MBRSignature;
+}; // struct EBRRecord
+
+// Possible states of the MBR
+enum MBRValidity {invalid, gpt, hybrid, mbr};
+
+// Full data in tweaked MBR format
+class MBRData {
+protected:
+   uint8_t code[440];
+   uint32_t diskSignature;
+   uint16_t nulls;
+   struct MBRRecord partitions[4];
+   uint16_t MBRSignature;
+
+   // Above are basic MBR data; now add more stuff....
+   uint32_t blockSize; // block size (usually 512)
+   uint64_t diskSize; // size in blocks
+   char device[256];
+   // Now an array of partitions for the logicals, in array form (easier
+   // than a linked list, and good enough for the GPT itself, so....)
+   struct MBRRecord logicals[NUM_LOGICALS];
+   MBRValidity state;
+   struct MBRRecord* GetPartition(int i); // Return primary or logical partition
+public:
+   MBRData(void);
+   MBRData(char* deviceFilename);
+   ~MBRData(void);
+   void EmptyMBR(void);
+   int ReadMBRData(char* deviceFilename);
+   void ReadMBRData(int fd);
+   int WriteMBRData(void);
+   void WriteMBRData(int fd);
+   int ReadLogicalPart(int fd, uint32_t extendedStart, uint32_t diskOffset,
+                       int partNum);
+   void DisplayMBRData(void);
+   void MakeProtectiveMBR(void);
+   MBRValidity GetValidity(void) {return state;}
+   void ShowState(void);
+   void MakePart(int num, uint32_t startLBA, uint32_t lengthLBA, int type = 0x07,
+                 int bootable = 0);
+
+   // Functions to extract data on specific partitions....
+   uint8_t GetStatus(int i);
+   uint8_t GetType(int i);
+   uint32_t GetFirstSector(int i);
+   uint32_t GetLength(int i);
+}; // struct MBRData
+
+#endif
-- 
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