IOMedia * IOGUIDPartitionScheme::instantiateMediaObject( gpt_ent * partition,
UInt32 partitionID )
{
//
// Instantiate a new media object to represent the given partition.
//
IOMedia * media = getProvider();
UInt64 mediaBlockSize = media->getPreferredBlockSize();
UInt64 partitionBase = 0;
uuid_string_t partitionHint;
char partitionName[36 * 3 + 1];
UInt64 partitionSize = 0;
ucs2_to_utf8( partition->ent_name,
sizeof(partition->ent_name),
partitionName,
sizeof(partitionName),
UCS_LITTLE_ENDIAN );
uuid_unparse( partition->ent_type,
partitionHint );
// Compute the relative byte position and size of the new partition.
partitionBase = OSSwapLittleToHostInt64(partition->ent_lba_start);
partitionSize = OSSwapLittleToHostInt64(partition->ent_lba_end);
partitionBase *= mediaBlockSize;
partitionSize *= mediaBlockSize;
partitionSize -= partitionBase - mediaBlockSize;
// Create the new media object.
IOMedia * newMedia = instantiateDesiredMediaObject(
/* partition */ partition,
/* partitionID */ partitionID );
if ( newMedia )
{
if ( newMedia->init(
/* base */ partitionBase,
/* size */ partitionSize,
/* preferredBlockSize */ mediaBlockSize,
/* attributes */ media->getAttributes(),
/* isWhole */ false,
/* isWritable */ media->isWritable(),
/* contentHint */ partitionHint ) )
{
// Set a name for this partition.
char name[24];
snprintf(name, sizeof(name), "Untitled %d", (int) partitionID);
newMedia->setName(partitionName[0] ? partitionName : name);
// Set a location value (the partition number) for this partition.
char location[12];
snprintf(location, sizeof(location), "%d", (int) partitionID);
newMedia->setLocation(location);
// Set the "Base" key for this partition.
newMedia->setProperty(kIOMediaBaseKey, partitionBase, 64);
// Set the "Partition ID" key for this partition.
newMedia->setProperty(kIOMediaPartitionIDKey, partitionID, 32);
// Set the "Universal Unique ID" key for this partition.
uuid_string_t uuid;
uuid_unparse(partition->ent_uuid, uuid);
newMedia->setProperty(kIOMediaUUIDKey, uuid);
}
else
{
newMedia->release();
newMedia = 0;
}
}
return newMedia;
}
IOMedia * IOFDiskPartitionScheme::instantiateMediaObject(
fdisk_part * partition,
UInt32 partitionID,
UInt32 fdiskBlock )
{
//
// Instantiate a new media object to represent the given partition.
//
IOMedia * media = getProvider();
UInt64 mediaBlockSize = media->getPreferredBlockSize();
UInt64 partitionBase = 0;
char * partitionHint = 0;
UInt64 partitionSize = 0;
// Compute the relative byte position and size of the new partition.
partitionBase = OSSwapLittleToHostInt32(partition->relsect) + fdiskBlock;
partitionSize = OSSwapLittleToHostInt32(partition->numsect);
partitionBase *= mediaBlockSize;
partitionSize *= mediaBlockSize;
// Clip the size of the new partition if it extends past the end-of-media.
if ( partitionBase + partitionSize > media->getSize() )
{
partitionSize = media->getSize() - partitionBase;
}
// Look up a type for the new partition.
char hintIndex[5];
snprintf(hintIndex, sizeof(hintIndex), "0x%02X", partition->systid & 0xFF);
partitionHint = hintIndex;
OSDictionary * hintTable = OSDynamicCast(
/* type */ OSDictionary,
/* instance */ getProperty(kIOFDiskPartitionSchemeContentTable) );
if ( hintTable )
{
OSString * hintValue;
hintValue = OSDynamicCast(OSString, hintTable->getObject(hintIndex));
if ( hintValue ) partitionHint = (char *) hintValue->getCStringNoCopy();
}
// Create the new media object.
IOMedia * newMedia = instantiateDesiredMediaObject(
/* partition */ partition,
/* partitionID */ partitionID,
/* fdiskBlock */ fdiskBlock );
if ( newMedia )
{
if ( newMedia->init(
/* base */ partitionBase,
/* size */ partitionSize,
/* preferredBlockSize */ mediaBlockSize,
/* attributes */ media->getAttributes(),
/* isWhole */ false,
/* isWritable */ media->isWritable(),
/* contentHint */ partitionHint ) )
{
// Set a name for this partition.
char name[24];
snprintf(name, sizeof(name), "Untitled %d", (int) partitionID);
newMedia->setName(name);
// Set a location value (the partition number) for this partition.
char location[12];
snprintf(location, sizeof(location), "%d", (int) partitionID);
newMedia->setLocation(location);
// Set the "Partition ID" key for this partition.
newMedia->setProperty(kIOMediaPartitionIDKey, partitionID, 32);
}
else
{
newMedia->release();
newMedia = 0;
}
}
return newMedia;
}
