Package ghidra.program.model.data

Class CharDataType

java.lang.Object

ghidra.program.model.data.AbstractDataType

ghidra.program.model.data.DataTypeImpl

ghidra.program.model.data.BuiltIn

ghidra.program.model.data.AbstractIntegerDataType

ghidra.program.model.data.CharDataType

All Implemented Interfaces:

ArrayStringable, BuiltInDataType, DataType, DataTypeWithCharset, ExtensionPoint

Direct Known Subclasses:

SignedCharDataType, UnsignedCharDataType

public class CharDataType
extends AbstractIntegerDataType
implements DataTypeWithCharset

Provides a definition of an primitive char in a program. The size and signed-ness of this type is determined by the data organization of the associated data type manager.

Field Summary

Fields

Modifier and Type	Field	Description
static final CharDataType	dataType

Fields inherited from class ghidra.program.model.data.AbstractIntegerDataType

ENDIAN, MNEMONIC, PADDING

Fields inherited from class ghidra.program.model.data.DataTypeImpl

defaultSettings

Fields inherited from class ghidra.program.model.data.AbstractDataType

categoryPath, dataMgr, name

Fields inherited from interface ghidra.program.model.data.DataType

CONFLICT_SUFFIX, DEFAULT, NO_LAST_CHANGE_TIME, NO_SOURCE_SYNC_TIME, TYPEDEF_ATTRIBUTE_PREFIX, TYPEDEF_ATTRIBUTE_SUFFIX, VOID

Constructor Summary

Constructors

Modifier	Constructor	Description
	CharDataType()	Constructs a new char datatype.
	CharDataType(DataTypeManager dtm)
protected	CharDataType(String name, DataTypeManager dtm)

Method Summary

Modifier and Type	Method	Description
CharDataType	clone(DataTypeManager dtm)	Returns an instance of this DataType using the specified DataTypeManager to allow its use of the corresponding DataOrganization while retaining its unique identity (see DataType.getUniversalID() and archive association (see DataType.getSourceArchive()) if applicable.
byte[]	encodeRepresentation(String repr, MemBuffer buf, Settings settings, int length)	Encode bytes according to the display format for this type.
byte[]	encodeValue(Object value, MemBuffer buf, Settings settings, int length)	Encode bytes from an Object appropriate for this DataType.
protected SettingsDefinition[]	getBuiltInSettingsDefinitions()	Gets a list of all the settingsDefinitions used by this datatype.
String	getCDeclaration()	Returns the C style data-type declaration for this data-type.
String	getCharsetName(Settings settings)	Get the character set for a specific data type and settings
String	getCTypeDeclaration(DataOrganization dataOrganization)	Returns null for FactoryDataType (which should never be used) and Dynamic types which should generally be replaced by a primitive array (e.g., char[5]) or, a primitive pointer (e.g., char *).
String	getDefaultLabelPrefix()	Returns the appropriate string to use as the default label prefix in the absence of any data.
String	getDefaultLabelPrefix(MemBuffer buf, Settings settings, int length, DataTypeDisplayOptions options)	Returns the appropriate string to use as the default label prefix.
String	getDescription()	Get a String briefly describing this DataType.
protected FormatSettingsDefinition	getFormatSettingsDefinition()	Return the Format settings definition included in the settings definition array
int	getLength()	Get the length of this DataType as a number of 8-bit bytes.
CharDataType	getOppositeSignednessDataType()
Object	getValue(MemBuffer buf, Settings settings, int length)	Returns the interpreted data value as an instance of the advertised value class.
Class<?>	getValueClass(Settings settings)	Get the Class of the value Object to be returned by this datatype (see DataType.getValue(MemBuffer, Settings, int)).
boolean	hasLanguageDependantLength()	Indicates if the length of this data-type is determined based upon the DataOrganization obtained from the associated DataTypeManager.
boolean	isEncodable()	Check if this type supports encoding (patching)
boolean	isSigned()	Determine if this type is signed.

Methods inherited from class ghidra.program.model.data.AbstractIntegerDataType

castValueToEncode, getArrayDefaultLabelPrefix, getArrayDefaultOffcutLabelPrefix, getAssemblyMnemonic, getBitCount, getCMnemonic, getMnemonic, getRepresentation, getSignedDataType, getSignedDataTypes, getUnsignedDataType, getUnsignedDataTypes, hasStringValue, isEquivalent

Methods inherited from class ghidra.program.model.data.BuiltIn

addParent, copy, dataTypeDeleted, dataTypeNameChanged, dataTypeReplaced, dataTypeSizeChanged, dependsOn, getCTypeDeclaration, getCTypeDeclaration, getCTypeDeclaration, getDecompilerDisplayName, getLastChangeTime, getSettingsDefinitions, getUniversalID, removeParent, setCategoryPath, setDefaultSettings, setName, setNameAndCategory

Methods inherited from class ghidra.program.model.data.DataTypeImpl

equals, getAlignedLength, getAlignment, getDefaultSettings, getLastChangeTimeInSourceArchive, getParents, getPathName, getSourceArchive, hashCode, notifyAlignmentChanged, notifyDeleted, notifyNameChanged, notifyParents, notifyReplaced, notifySizeChanged, replaceWith, setDescription, setLastChangeTime, setLastChangeTimeInSourceArchive, setSourceArchive

Methods inherited from class ghidra.program.model.data.AbstractDataType

dataTypeAlignmentChanged, getCategoryPath, getDataOrganization, getDataOrganization, getDataTypeManager, getDataTypePath, getDefaultAbbreviatedLabelPrefix, getDefaultOffcutLabelPrefix, getDisplayName, getDocs, getName, getTypeDefSettingsDefinitions, isDeleted, isNotYetDefined, isZeroLength, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface ghidra.program.model.data.ArrayStringable

getArrayString

Methods inherited from interface ghidra.program.model.data.DataType

addParent, copy, dataTypeAlignmentChanged, dataTypeDeleted, dataTypeNameChanged, dataTypeReplaced, dataTypeSizeChanged, dependsOn, getAlignedLength, getAlignment, getCategoryPath, getDataOrganization, getDataTypeManager, getDataTypePath, getDefaultAbbreviatedLabelPrefix, getDefaultOffcutLabelPrefix, getDefaultSettings, getDisplayName, getDocs, getLastChangeTime, getLastChangeTimeInSourceArchive, getMnemonic, getName, getParents, getPathName, getRepresentation, getSettingsDefinitions, getSourceArchive, getTypeDefSettingsDefinitions, getUniversalID, isDeleted, isEquivalent, isNotYetDefined, isZeroLength, removeParent, replaceWith, setCategoryPath, setDescription, setLastChangeTime, setLastChangeTimeInSourceArchive, setName, setNameAndCategory, setSourceArchive

Methods inherited from interface ghidra.program.model.data.DataTypeWithCharset

encodeCharacterRepresentation, encodeCharacterValue

Field Details

dataType

public static final CharDataType dataType

Constructor Details

CharDataType

public CharDataType()

Constructs a new char datatype.

CharDataType

public CharDataType(DataTypeManager dtm)

CharDataType

protected CharDataType(String name,
 DataTypeManager dtm)

Method Details

isSigned

public boolean isSigned()

Description copied from class: AbstractIntegerDataType

Determine if this type is signed.

Specified by:

isSigned in class AbstractIntegerDataType

Returns:

true if this is a signed integer data-type

getFormatSettingsDefinition

protected FormatSettingsDefinition getFormatSettingsDefinition()

Description copied from class: AbstractIntegerDataType

Return the Format settings definition included in the settings definition array

Overrides:

getFormatSettingsDefinition in class AbstractIntegerDataType

Returns:

Format settings definition included in the settings definition array

See Also:

• BuiltIn.getSettingsDefinitions()

getBuiltInSettingsDefinitions

protected SettingsDefinition[] getBuiltInSettingsDefinitions()

Description copied from class: BuiltIn

Gets a list of all the settingsDefinitions used by this datatype.

Overrides:

getBuiltInSettingsDefinitions in class AbstractIntegerDataType

Returns:

a list of the settingsDefinitions used by this datatype.

getCDeclaration

public String getCDeclaration()

Returns the C style data-type declaration for this data-type. Null is returned if no appropriate declaration exists.

Overrides:

getCDeclaration in class AbstractIntegerDataType

Returns:

the C style data-type declaration for this data-type. Null is returned if no appropriate declaration exists.

getLength

public int getLength()

Description copied from interface: DataType

Get the length of this DataType as a number of 8-bit bytes.

For primitive datatypes this reflects the smallest varnode which can be used to contain its value (i.e., raw data length).

Example: For x86 32-bit gcc an 80-bit long double raw data length of 10-bytes will fit within a floating point register while its aligned-length of 12-bytes is used by the gcc compiler for data/array/component allocations to maintain alignment (i.e., sizeof(long double) ).

NOTE: Other than the VoidDataType, no datatype should ever return 0, even if DataType.isZeroLength(), and only Dynamic/FactoryDataType datatypes should return -1. If DataType.isZeroLength() is true a length of 1 should be returned. Where a zero-length datatype can be handled (e.g., Composite) the DataType.isZeroLength() method should be used.

Specified by:

getLength in interface DataType

Returns:

the length of this DataType

hasLanguageDependantLength

public boolean hasLanguageDependantLength()

Description copied from interface: DataType

Indicates if the length of this data-type is determined based upon the DataOrganization obtained from the associated DataTypeManager.

Specified by:

hasLanguageDependantLength in interface DataType

Overrides:

hasLanguageDependantLength in class AbstractDataType

Returns:

true length is language/compiler-specification dependent, else false

getDescription

public String getDescription()

Description copied from interface: DataType

Get a String briefly describing this DataType.

Specified by:

getDescription in interface DataType

Returns:

a one-liner describing this DataType.

getValue

public Object getValue(MemBuffer buf,
 Settings settings,
 int length)

Description copied from interface: DataType

Returns the interpreted data value as an instance of the advertised value class.

For instance, Pointer data types should return an Address object (or null), or integer data types should return a Scalar object.

Specified by:

getValue in interface DataType

Overrides:

getValue in class AbstractIntegerDataType

Parameters:

buf - the data buffer

settings - the settings to use.

length - indicates the maximum number of bytes that may be consumed by a Dynamic datatype, otherwise this value is ignored. A value of -1 may be specified to allow a Dynamic datatype to determine the length based upon the actual data bytes

Returns:

the data object, or null if data is invalid

isEncodable

public boolean isEncodable()

Description copied from interface: DataType

Check if this type supports encoding (patching)

If unsupported, DataType.encodeValue(Object, MemBuffer, Settings, int) and DataType.encodeRepresentation(String, MemBuffer, Settings, int) will always throw an exception. Actions which rely on either encode method should not be displayed if the applicable datatype is not encodable.

Specified by:

isEncodable in interface DataType

Overrides:

isEncodable in class AbstractIntegerDataType

Returns:

true if encoding is supported

encodeValue

public byte[] encodeValue(Object value,
 MemBuffer buf,
 Settings settings,
 int length)
                   throws DataTypeEncodeException

Description copied from interface: DataType

Encode bytes from an Object appropriate for this DataType.

Converts the given object to the byte encoding and returns it. When appropriate, this should seek the nearest encoding to the specified value, since the object may come from a user script. For example, a floating-point value may be rounded. Invalid values should be rejected with a DataTypeEncodeException.

Specified by:

encodeValue in interface DataType

Overrides:

encodeValue in class AbstractIntegerDataType

Parameters:

value - the desired value.

buf - a buffer representing the eventual destination of the bytes.

settings - the settings to use.

length - the expected length of the result, usually the length of the data unit, or -1 to let the type choose the length. It may be ignored, e.g., for fixed-length types.

Returns:

the encoded value.

Throws:

DataTypeEncodeException - if the value cannot be encoded for any reason, e.g., incorrect type, not enough space, buffer overflow, unsupported (see DataType.isEncodable()).

encodeRepresentation

public byte[] encodeRepresentation(String repr,
 MemBuffer buf,
 Settings settings,
 int length)
                            throws DataTypeEncodeException

Description copied from interface: DataType

Encode bytes according to the display format for this type.

Converts the given representation to the byte encoding and returns it. When appropriate, this should seek the nearest encoding to the specified value, since the representation is likely coming from user input. For example, a floating-point value may be rounded. Invalid representations should be rejected with a DataTypeEncodeException.

Specified by:

encodeRepresentation in interface DataType

Overrides:

encodeRepresentation in class AbstractIntegerDataType

Parameters:

repr - the representation of the desired value, as in DataType.getRepresentation(MemBuffer, Settings, int). The supported formats depend on the specific datatype and its settings.

buf - a buffer representing the eventual destination of the bytes.

settings - the settings to use for the representation.

length - the expected length of the result, usually the length of the data unit, or -1 to let the type choose the length. It may be ignored, e.g., for fixed-length types.

Returns:

the encoded value.

Throws:

DataTypeEncodeException - if the value cannot be encoded for any reason, e.g., incorrect format, not enough space, buffer overflow, unsupported (see DataType.isEncodable()).

getValueClass

public Class<?> getValueClass(Settings settings)

Description copied from interface: DataType

Get the Class of the value Object to be returned by this datatype (see DataType.getValue(MemBuffer, Settings, int)).

Specified by:

getValueClass in interface DataType

Overrides:

getValueClass in class AbstractIntegerDataType

Parameters:

settings - the relevant settings to use or null for default.

Returns:

Class of the value to be returned by this datatype or null if it can vary or is unspecified. Types which correspond to a string or char array will return the String class.

clone

public CharDataType clone(DataTypeManager dtm)

Description copied from interface: DataType

Returns an instance of this DataType using the specified DataTypeManager to allow its use of the corresponding DataOrganization while retaining its unique identity (see DataType.getUniversalID() and archive association (see DataType.getSourceArchive()) if applicable.

This instance will be returned if this datatype's DataTypeManager matches the specified dtm. The recursion depth of a clone will stop on any datatype whose DataTypeManager matches the specified dtm and simply use the existing datatype instance.

NOTE: In general, this method should not be used to obtain an instance to be modified. In most cases changes may be made directly to this instance if supported or to a DataType.copy(DataTypeManager) of this type.

Specified by:

clone in interface DataType

Parameters:

dtm - the data-type manager instance whose data-organization should apply.

Returns:

cloned instance which may be the same as this instance

getDefaultLabelPrefix

public String getDefaultLabelPrefix(MemBuffer buf,
 Settings settings,
 int length,
 DataTypeDisplayOptions options)

Description copied from interface: DataType

Returns the appropriate string to use as the default label prefix.

Specified by:

getDefaultLabelPrefix in interface DataType

Overrides:

getDefaultLabelPrefix in class AbstractDataType

Parameters:

buf - memory buffer containing the bytes.

settings - the Settings object

length - the length of the data.

options - options for how to format the default label prefix.

Returns:

the default label prefix or null if none specified.

getDefaultLabelPrefix

public String getDefaultLabelPrefix()

Description copied from interface: DataType

Returns the appropriate string to use as the default label prefix in the absence of any data.

Specified by:

getDefaultLabelPrefix in interface DataType

Overrides:

getDefaultLabelPrefix in class AbstractIntegerDataType

Returns:

the default label prefix or null if none specified.

getCTypeDeclaration

public String getCTypeDeclaration(DataOrganization dataOrganization)

Description copied from class: BuiltIn

Returns null for FactoryDataType (which should never be used) and Dynamic types which should generally be replaced by a primitive array (e.g., char[5]) or, a primitive pointer (e.g., char *). For other types an appropriately sized unsigned integer typedef is returned.

Specified by:

getCTypeDeclaration in interface BuiltInDataType

Overrides:

getCTypeDeclaration in class BuiltIn

Parameters:

dataOrganization - or null for default

Returns:

definition C-statement (e.g., #define or typedef) or null if type name is a standard C-primitive name or if type is FactoryDataType or Dynamic.

See Also:

• BuiltInDataType.getCTypeDeclaration(ghidra.program.model.data.DataOrganization)

getOppositeSignednessDataType

public CharDataType getOppositeSignednessDataType()

Specified by:

getOppositeSignednessDataType in class AbstractIntegerDataType

Returns:

the data-type with the opposite signedness from this data-type. For example, this method on IntegerDataType will return an instance of UnsignedIntegerDataType.

getCharsetName

public String getCharsetName(Settings settings)

Description copied from interface: DataTypeWithCharset

Get the character set for a specific data type and settings

Specified by:

getCharsetName in interface DataTypeWithCharset

Parameters:

settings - data instance settings

Returns:

Charset for this datatype and settings