1 files changed, 153 insertions, 0 deletions

diff --git a/e2fsprogs/ext2fs/dosio.h b/e2fsprogs/ext2fs/dosio.h
new file mode 100644
index 000000000..a0d652d5b
--- /dev/null
+++ b/e2fsprogs/ext2fs/dosio.h
@@ -0,0 +1,153 @@
+/*
+ * v1.0
+ *
+ * Disk I/O include file for the ext2fs/DOS library.
+ *
+ * Copyright (c) 1997 Mark Habersack
+ * This file may be distributed under the terms of the GNU Public License.
+ *
+ */
+#ifndef __diskio_h
+#define __diskio_h
+#ifdef __TURBOC__
+#ifndef __LARGE__
+# error "ext2fs/DOS library requires LARGE model!"
+#endif
+#endif
+
+#ifdef __TURBOC__
+#include "msdos.h"
+#endif
+
+/*
+ * A helper structure used in LBA => CHS conversion
+ */
+typedef struct
+{
+  unsigned short       cyl;     /* Cylinder (or track) */
+  unsigned short       head;
+  unsigned short       sector;
+  unsigned short       offset;  /* Offset of byte within the sector */
+} CHS;
+
+/*
+ * All partition data we need is here
+ */
+typedef struct
+{
+  char                 *dev;  /* _Linux_ device name (like "/dev/hda1") */
+  unsigned char        phys;  /* Physical DOS drive number */
+  unsigned long        start; /* LBA address of partition start */
+  unsigned long        len;   /* length of partition in sectors */
+  unsigned char        pno;   /* Partition number (read from *dev) */
+
+  /* This partition's drive geometry */
+  unsigned short       cyls;
+  unsigned short       heads;
+  unsigned short       sects;
+} PARTITION;
+
+/*
+ * PC partition table entry format
+ */
+#ifdef __DJGPP__
+#pragma pack(1)
+#endif
+typedef struct
+{
+  unsigned char        active;
+  unsigned char        start_head;
+  unsigned char        start_sec;
+  unsigned char        start_cyl;
+  unsigned char        type;
+  unsigned char        end_head;
+  unsigned char        end_sec;
+  unsigned char        end_cyl;
+  unsigned long        first_sec_rel;
+  unsigned long        size;
+} PTABLE_ENTRY;
+#ifdef __DJGPP__
+#pragma pack()
+#endif
+
+/*
+ * INT 0x13 operation codes
+ */
+#define DISK_READ          0x02
+#define DISK_WRITE         0x03
+#define DISK_GET_GEOMETRY  0x08
+#define DISK_READY         0x10
+
+/*
+ * Errors to put in _dio_error
+ */
+#define ERR_BADDEV         0x00000001L
+#define ERR_HARDWARE       0x00000002L
+#define ERR_NOTSUPP        0x00000003L
+#define ERR_NOTEXT2FS      0x00000004L
+#define ERR_EMPTYPART      0x00000005L
+#define ERR_LINUXSWAP      0x00000006L
+
+/*
+ * Functions in diskio.c
+ */
+
+/*
+ * Variable contains last module's error
+ */
+extern unsigned long        _dio_error;
+
+/*
+ * This one contains last hardware error (if _dio_error == ERR_HARDWARE)
+ */
+extern unsigned long        _dio_hw_error;
+
+/*
+ * Macros to check for disk hardware errors
+ */
+#define HW_OK()             ((unsigned char)_dio_hw_error == 0x00)
+#define HW_BAD_CMD()        ((unsigned char)_dio_hw_error == 0x01)
+#define HW_NO_ADDR_MARK()   ((unsigned char)_dio_hw_error == 0x02)
+#define HW_WRITE_PROT()     ((unsigned char)_dio_hw_error == 0x03)
+#define HW_NO_SECTOR()      ((unsigned char)_dio_hw_error == 0x04)
+#define HW_RESET_FAIL()     ((unsigned char)_dio_hw_error == 0x05)
+#define HW_DISK_CHANGED()   ((unsigned char)_dio_hw_error == 0x06)
+#define HW_DRIVE_FAIL()     ((unsigned char)_dio_hw_error == 0x07)
+#define HW_DMA_OVERRUN()    ((unsigned char)_dio_hw_error == 0x08)
+#define HW_DMA_BOUNDARY()   ((unsigned char)_dio_hw_error == 0x09)
+#define HW_BAD_SECTOR()     ((unsigned char)_dio_hw_error == 0x0A)
+#define HW_BAD_TRACK()      ((unsigned char)_dio_hw_error == 0x0B)
+#define HW_UNSUPP_TRACK()   ((unsigned char)_dio_hw_error == 0x0C)
+#define HW_BAD_CRC_ECC()    ((unsigned char)_dio_hw_error == 0x10)
+#define HW_CRC_ECC_CORR()   ((unsigned char)_dio_hw_error == 0x11)
+#define HW_CONTR_FAIL()     ((unsigned char)_dio_hw_error == 0x20)
+#define HW_SEEK_FAIL()      ((unsigned char)_dio_hw_error == 0x40)
+#define HW_ATTACH_FAIL()    ((unsigned char)_dio_hw_error == 0x80)
+#define HW_DRIVE_NREADY()   ((unsigned char)_dio_hw_error == 0xAA)
+#define HW_UNDEF_ERROR()    ((unsigned char)_dio_hw_error == 0xBB)
+#define HW_WRITE_FAULT()    ((unsigned char)_dio_hw_error == 0xCC)
+#define HW_STATUS_ERROR()   ((unsigned char)_dio_hw_error == 0xE0)
+#define HW_SENSE_FAIL()     ((unsigned char)_dio_hw_error == 0xFF)
+
+
+/*
+ * Open the specified partition.
+ * String 'dev' must have a format:
+ *
+ *  /dev/{sd|hd|fd}[X]
+ *
+ * where,
+ *
+ *  only one of the option in curly braces can be used and X is an optional
+ *  partition number for the given device. If X is not specified, function
+ *  scans the drive's partition table in search for the first Linux ext2fs
+ *  partition (signature 0x83). Along the way it dives into every extended
+ *  partition encountered.
+ *  Scan ends if either (a) there are no more used partition entries, or
+ *  (b) there is no Xth partition.
+ *
+ * Routine returns 0 on success and !=0 otherwise.
+ */
+int open_partition(char *dev);
+
+#endif /* __diskio_h */