ae9b22c69b
when opening raw disk devices.
* fhandler_floppy.cc (fhandler_dev_floppy::lseek): Implement bytewise
access.
* fhandler_raw.cc (fhandler_dev_raw::open): Always open raw disk device
binary.
(fhandler_dev_raw::raw_write): Don't drop read buffer content when
writing after read.
165 lines
3.4 KiB
C++
165 lines
3.4 KiB
C++
/* fhandler_floppy.cc. See fhandler.h for a description of the
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fhandler classes.
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Copyright 1999, 2000 Cygnus Solutions.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#include <sys/termios.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <unistd.h>
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#include "fhandler.h"
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#include "cygerrno.h"
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/**********************************************************************/
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/* fhandler_dev_floppy */
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int
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fhandler_dev_floppy::is_eom (int win_error)
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{
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int ret = (win_error == ERROR_INVALID_PARAMETER);
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if (ret)
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debug_printf ("end of medium");
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return ret;
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}
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int
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fhandler_dev_floppy::is_eof (int)
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{
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int ret = 0;
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if (ret)
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debug_printf ("end of file");
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return ret;
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}
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fhandler_dev_floppy::fhandler_dev_floppy (const char *name, int unit) : fhandler_dev_raw (FH_FLOPPY, name, unit)
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{
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set_cb (sizeof *this);
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}
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int
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fhandler_dev_floppy::open (const char *path, int flags, mode_t)
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{
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/* The correct size of the buffer would be 512 bytes,
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* which is the atomic size, supported by WinNT.
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* Unfortunately, the performance is worse than
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* access to file system on same device!
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* Setting buffer size to a relatively big value
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* increases performance by means.
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* The new ioctl call with 'rdevio.h' header file
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* supports changing this value.
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*
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* Let's be smart: Let's take a multiplier of typical tar
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* and cpio buffer sizes by default!
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*/
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devbufsiz = 61440L; /* 512L; */
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return fhandler_dev_raw::open (path, flags);
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}
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int
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fhandler_dev_floppy::close (void)
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{
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int ret;
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ret = writebuf ();
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if (ret)
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{
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fhandler_dev_raw::close ();
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return ret;
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}
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return fhandler_dev_raw::close ();
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}
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off_t
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fhandler_dev_floppy::lseek (off_t offset, int whence)
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{
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int ret;
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DWORD off;
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char buf[512];
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if (whence == SEEK_SET)
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{
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if (offset < 0)
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{
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set_errno (EINVAL);
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return -1;
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}
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/* Invalidate buffer. */
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ret = writebuf ();
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if (ret)
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return ret;
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devbufstart = devbufend = 0;
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off = (offset / 512) * 512;
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if (SetFilePointer (get_handle (), off, NULL, FILE_BEGIN)
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== INVALID_SET_FILE_POINTER)
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{
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__seterrno ();
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return -1;
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}
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return raw_read (buf, offset - off);
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}
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else if (whence == SEEK_CUR)
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{
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DWORD low;
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LONG high = 0;
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low = SetFilePointer (get_handle (), 0, &high, FILE_CURRENT);
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if (low == INVALID_SET_FILE_POINTER && GetLastError ())
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{
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__seterrno ();
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return -1;
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}
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long long cur = (long long) high << 32 + low;
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if (is_writing)
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cur += devbufend - devbufstart;
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else
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cur -= devbufend - devbufstart;
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/* Invalidate buffer. */
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ret = writebuf ();
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if (ret)
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return ret;
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devbufstart = devbufend = 0;
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cur += offset;
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if (cur < 0)
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{
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set_errno (EINVAL);
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return -1;
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}
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long long set = (cur / 512) * 512;
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high = set >> 32;
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low = set & 0xffffffff;
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off = cur - set;
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low = SetFilePointer (get_handle (), low, &high, FILE_BEGIN);
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if (low == INVALID_SET_FILE_POINTER && GetLastError ())
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{
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__seterrno ();
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return -1;
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}
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return raw_read (buf, off);
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}
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/* SEEK_END is not supported on raw disk devices. */
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set_errno (EINVAL);
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return -1;
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}
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int
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fhandler_dev_floppy::ioctl (unsigned int cmd, void *buf)
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{
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return fhandler_dev_raw::ioctl (cmd, buf);
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}
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