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-rw-r--r--lib/ext2fs/dosio.h157
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diff --git a/lib/ext2fs/dosio.h b/lib/ext2fs/dosio.h
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+/*
+ * v1.0
+ *
+ * Disk I/O include file for the ext2fs/DOS library.
+ *
+ * Copyright (c) 1997 Mark Habersack
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
+ * %End-Header%
+ */
+
+#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 */