void device_image_interface::device_compute_hash(hash_collection &hashes, const void *data, size_t length, const char *types) const
{
/* retrieve the partial hash func */
device_image_partialhash_func partialhash = get_partial_hash();
/* compute the hash */
if (partialhash)
partialhash(hashes, (const unsigned char*)data, length, types);
else
hashes.compute(reinterpret_cast<const UINT8 *>(data), length, types);
}
void device_image_interface::image_checkhash()
{
device_image_partialhash_func partialhash;
/* only calculate CRC if it hasn't been calculated, and the open_mode is read only */
if (m_hash.first() == NULL && m_readonly && !m_created)
{
/* do not cause a linear read of 600 megs please */
/* TODO: use SHA1 in the CHD header as the hash */
if (image_type() == IO_CDROM)
return;
/* Skip calculating the hash when we have an image mounted through a software list */
if ( m_software_info_ptr )
return;
/* retrieve the partial hash func */
partialhash = get_partial_hash();
run_hash(partialhash, m_hash, hash_collection::HASH_TYPES_ALL);
}
return;
}
void device_image_interface::image_checkhash()
{
device_image_partialhash_func partialhash;
// only calculate CRC if it hasn't been calculated, and the open_mode is read only
UINT32 crcval;
if (!m_hash.crc(crcval) && is_readonly() && !m_created)
{
// do not cause a linear read of 600 megs please
// TODO: use SHA1 in the CHD header as the hash
if (image_type() == IO_CDROM)
return;
// Skip calculating the hash when we have an image mounted through a software list
if ( m_software_info_ptr )
return;
// retrieve the partial hash func
partialhash = get_partial_hash();
run_hash(partialhash, m_hash, util::hash_collection::HASH_TYPES_ALL);
}
return;
}