iodev/cdrom_beos.cc

   1 /////////////////////////////////////////////////////////////////////////
   2 // $Id: cdrom_beos.cc,v 1.3 2008/01/26 22:24:00 sshwarts Exp $
   3 /////////////////////////////////////////////////////////////////////////
   4
   5 #include <SupportDefs.h>
   6 #include <Drivers.h>
   7
   8 #include <sys/stat.h>
   9 #include <unistd.h>
  10
  11 #include "cdrom_beos.h"
  12
  13 int
  14 GetLogicalBlockSize(int fd)
  15 {
  16     partition_info  p_info;
  17
  18     if (ioctl(fd, B_GET_PARTITION_INFO, &p_info) == B_NO_ERROR)
  19     {
  20         //dprintf("GetLogicalBlockSize: ioctl suceed\n");
  21                 return p_info.logical_block_size;
  22         }
  23     else //dprintf("GetLogicalBlockSize = ioctl returned error\n");
  24         return 0;
  25 }
  26
  27 int
  28 GetDeviceBlockSize(int fd)
  29 {
  30     struct stat     st;
  31     device_geometry dg;
  32
  33     if (ioctl(fd, B_GET_GEOMETRY, &dg) < 0)
  34     {
  35                 if (fstat(fd, &st) < 0 || S_ISDIR(st.st_mode))
  36                 return 0;
  37                 return 512;   /* just assume it's a plain old file or something */
  38     }
  39
  40     return dg.bytes_per_sector;
  41 }
  42
  43 off_t
  44 GetNumDeviceBlocks(int fd, int block_size)
  45 {
  46     struct stat                 st;
  47     device_geometry             dg;
  48
  49     if (ioctl(fd, B_GET_GEOMETRY, &dg) >= 0)
  50     {
  51                 return (off_t)dg.cylinder_count *
  52                (off_t)dg.sectors_per_track *
  53                (off_t)dg.head_count;
  54     }
  55
  56     /* if the ioctl fails, try just stat'ing in case it's a regular file */
  57     if (fstat(fd, &st) < 0)
  58         return 0;
  59
  60     return st.st_size / block_size;
  61 }