static grub_err_t
grub_util_biosdisk_read (grub_disk_t disk, grub_disk_addr_t sector,
grub_size_t size, char *buf)
{
while (size)
{
grub_util_fd_t fd;
grub_disk_addr_t max = ~0ULL;
fd = grub_util_fd_open_device (disk, sector, GRUB_UTIL_FD_O_RDONLY, &max);
if (!GRUB_UTIL_FD_IS_VALID (fd))
return grub_errno;
#ifdef __linux__
if (sector == 0)
/* Work around a bug in Linux ez remapping. Linux remaps all
sectors that are read together with the MBR in one read. It
should only remap the MBR, so we split the read in two
parts. -jochen */
max = 1;
#endif /* __linux__ */
if (max > size)
max = size;
if (grub_util_fd_read (fd, buf, max << disk->log_sector_size)
!= (ssize_t) (max << disk->log_sector_size))
return grub_error (GRUB_ERR_READ_ERROR, N_("cannot read `%s': %s"),
map[disk->id].device, grub_util_fd_strerror ());
size -= max;
buf += (max << disk->log_sector_size);
sector += max;
}
return GRUB_ERR_NONE;
}
static grub_ssize_t
grub_hostfs_read (grub_file_t file, char *buf, grub_size_t len)
{
struct grub_hostfs_data *data;
data = file->data;
if (grub_util_fd_seek (data->f, file->offset) != 0)
{
grub_error (GRUB_ERR_OUT_OF_RANGE, N_("cannot seek `%s': %s"),
data->filename, grub_util_fd_strerror ());
return -1;
}
unsigned int s = grub_util_fd_read (data->f, buf, len);
if (s != len)
grub_error (GRUB_ERR_FILE_READ_ERROR, N_("cannot read `%s': %s"),
data->filename, grub_util_fd_strerror ());
return (signed) s;
}