Package ghidra.program.model.data

Class AbstractStringDataType

java.lang.Object

ghidra.program.model.data.AbstractDataType

ghidra.program.model.data.DataTypeImpl

ghidra.program.model.data.BuiltIn

ghidra.program.model.data.AbstractStringDataType

All Implemented Interfaces:

BuiltInDataType, DataType, DataTypeWithCharset, Dynamic, ExtensionPoint

Direct Known Subclasses:

PascalString255DataType, PascalStringDataType, PascalUnicodeDataType, StringDataType, StringUTF8DataType, TerminatedStringDataType, TerminatedUnicode32DataType, TerminatedUnicodeDataType, Unicode32DataType, UnicodeDataType

public abstract class AbstractStringDataType
extends BuiltIn
implements Dynamic, DataTypeWithCharset

Common base class for all Ghidra string DataTypes.

See StringDataType for information about string variations and configuration details.

Sub-classes generally only need to implement a constructor that calls the mega-constructor AbstractStringDataType.AbstractStringDataType(lots,of,params) and the DataType.clone(DataTypeManager) method.

Field Summary

Fields

Modifier and Type	Field	Description
static final SettingsDefinition[]	COMMON_STRING_SETTINGS_DEFS
static final SettingsDefinition[]	COMMON_WITH_CHARSET_STRING_SETTINGS_DEFS
static final String	DEFAULT_ABBREV_PREFIX
static final String	DEFAULT_LABEL
static final String	DEFAULT_LABEL_PREFIX
static final String	DEFAULT_UNICODE_ABBREV_PREFIX
static final String	DEFAULT_UNICODE_LABEL
static final String	DEFAULT_UNICODE_LABEL_PREFIX
static final String	USE_CHARSET_DEF_DEFAULT	A symbolic name to signal that the null value being passed for the charset name param indicates that the default charset (ie.

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
protected	AbstractStringDataType(String name, String mnemonic, String defaultLabel, String defaultLabelPrefix, String defaultAbbrevLabelPrefix, String description, String charsetName, DataType replacementDataType, StringLayoutEnum stringLayout, DataTypeManager dtm)	Protected constructor used by derived types to provide all their datatype details.

Method Summary

Modifier and Type	Method	Description
boolean	canSpecifyLength()	Determine if the length may be specified for an instanceof this datatype (e.g., Data, Array, DataTypeComponent, etc.).
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	getCharsetName(Settings settings)	Get the character set for a specific data type and settings
String	getDefaultAbbreviatedLabelPrefix()	Returns the prefix to use for this datatype when an abbreviated prefix is desired.
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 len, DataTypeDisplayOptions options)	Returns the appropriate string to use as the default label prefix.
String	getDefaultOffcutLabelPrefix(MemBuffer buf, Settings settings, int len, DataTypeDisplayOptions options, int offcutLength)	Returns the appropriate string to use as the default label prefix.
String	getDescription()	Get a String briefly describing this DataType.
int	getLength()	Get the length of this DataType as a number of 8-bit bytes.
int	getLength(MemBuffer buf, int maxLength)	Compute the length for this data-type which corresponds to the specified memory location.
String	getMnemonic(Settings settings)	Get the mnemonic for this DataType.
DataType	getReplacementBaseType()	Returns a suitable replacement base data-type for pointers and arrays when exporting to C code
String	getRepresentation(MemBuffer buf, Settings settings, int length)	Get bytes from memory in a printable format for this type.
StringDataInstance	getStringDataInstance(MemBuffer buf, Settings settings, int length)	Creates a new StringDataInstance using the bytes in the supplied MemBuffer and options provided by this DataType.
StringLayoutEnum	getStringLayout()
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	isEncodable()	Check if this type supports encoding (patching)

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

addParent, copy, dataTypeDeleted, dataTypeNameChanged, dataTypeReplaced, dataTypeSizeChanged, dependsOn, getCTypeDeclaration, getCTypeDeclaration, getCTypeDeclaration, getCTypeDeclaration, getDecompilerDisplayName, getLastChangeTime, getSettingsDefinitions, getUniversalID, isEquivalent, 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, getDisplayName, getDocs, getName, getTypeDefSettingsDefinitions, hasLanguageDependantLength, 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.BuiltInDataType

getCTypeDeclaration, setDefaultSettings

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

addParent, clone, copy, dataTypeAlignmentChanged, dataTypeDeleted, dataTypeNameChanged, dataTypeReplaced, dataTypeSizeChanged, dependsOn, getAlignedLength, getAlignment, getCategoryPath, getDataOrganization, getDataTypeManager, getDataTypePath, getDefaultSettings, getDisplayName, getDocs, getLastChangeTime, getLastChangeTimeInSourceArchive, getName, getParents, getPathName, getSettingsDefinitions, getSourceArchive, getTypeDefSettingsDefinitions, getUniversalID, hasLanguageDependantLength, 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

COMMON_STRING_SETTINGS_DEFS

public static final SettingsDefinition[] COMMON_STRING_SETTINGS_DEFS

COMMON_WITH_CHARSET_STRING_SETTINGS_DEFS

public static final SettingsDefinition[] COMMON_WITH_CHARSET_STRING_SETTINGS_DEFS

DEFAULT_UNICODE_LABEL

public static final String DEFAULT_UNICODE_LABEL

See Also:

• Constant Field Values

DEFAULT_UNICODE_LABEL_PREFIX

public static final String DEFAULT_UNICODE_LABEL_PREFIX

See Also:

• Constant Field Values

DEFAULT_UNICODE_ABBREV_PREFIX

public static final String DEFAULT_UNICODE_ABBREV_PREFIX

See Also:

• Constant Field Values

DEFAULT_LABEL

public static final String DEFAULT_LABEL

See Also:

• Constant Field Values

DEFAULT_LABEL_PREFIX

public static final String DEFAULT_LABEL_PREFIX

See Also:

• Constant Field Values

DEFAULT_ABBREV_PREFIX

public static final String DEFAULT_ABBREV_PREFIX

See Also:

• Constant Field Values

USE_CHARSET_DEF_DEFAULT

public static final String USE_CHARSET_DEF_DEFAULT

A symbolic name to signal that the null value being passed for the charset name param indicates that the default charset (ie. ASCII) should be used.

Constructor Details

AbstractStringDataType

protected AbstractStringDataType(String name,
 String mnemonic,
 String defaultLabel,
 String defaultLabelPrefix,
 String defaultAbbrevLabelPrefix,
 String description,
 String charsetName,
 DataType replacementDataType,
 StringLayoutEnum stringLayout,
 DataTypeManager dtm)

Protected constructor used by derived types to provide all their datatype details.

Parameters:

name - Name of this datatype

mnemonic - Mnemonic of this datatype

defaultLabel - Label string for this datatype. See defaultLabel.

defaultLabelPrefix - Label prefix string for this datatype. See defaultLabelPrefix.

defaultAbbrevLabelPrefix - Abbreviated label prefix for this datatype. See defaultAbbrevLabelPrefix.

description - Description of this datatype.

charsetName - Charset name for this string datatype. If null the settings of the data instance will be queried for a charset.

replacementDataType - Replacement DataType.

stringLayout - stringLayout controls how the string is laid out in memory.

dtm - DataTypeManager for this datatype, null ok.

Method Details

getMnemonic

public String getMnemonic(Settings settings)

Description copied from interface: DataType

Get the mnemonic for this DataType.

Specified by:

getMnemonic in interface DataType

Overrides:

getMnemonic in class AbstractDataType

Parameters:

settings - settings which may influence the result or null

Returns:

the mnemonic for this DataType.

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 AbstractDataType

Returns:

the default label prefix or null if none specified.

getDefaultAbbreviatedLabelPrefix

public String getDefaultAbbreviatedLabelPrefix()

Description copied from interface: DataType

Returns the prefix to use for this datatype when an abbreviated prefix is desired.

For example, some datatypes will built a large default label, at which is is more desirable to have a shortened prefix.

Specified by:

getDefaultAbbreviatedLabelPrefix in interface DataType

Overrides:

getDefaultAbbreviatedLabelPrefix in class AbstractDataType

Returns:

the prefix to use for this datatype when an abbreviated prefix is desired. May return null.

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.

getBuiltInSettingsDefinitions

protected SettingsDefinition[] getBuiltInSettingsDefinitions()

Description copied from class: BuiltIn

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

Overrides:

getBuiltInSettingsDefinitions in class BuiltIn

Returns:

a list of the settingsDefinitions used by this datatype.

getStringDataInstance

public StringDataInstance getStringDataInstance(MemBuffer buf,
 Settings settings,
 int length)

Creates a new StringDataInstance using the bytes in the supplied MemBuffer and options provided by this DataType.

Parameters:

buf - the data.

settings - the settings to use for the representation.

length - the number of bytes to represent.

Returns:

a new StringDataInstance, never null.

getStringLayout

public StringLayoutEnum getStringLayout()

Returns:

StringLayoutEnum settinEnum stringLayoutype.

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

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

canSpecifyLength

public boolean canSpecifyLength()

Description copied from interface: Dynamic

Determine if the length may be specified for an instanceof this datatype (e.g., Data, Array, DataTypeComponent, etc.).

Specified by:

canSpecifyLength in interface Dynamic

Returns:

true if a user-specified length can be used, else false

getLength

public int getLength(MemBuffer buf,
 int maxLength)

Description copied from interface: Dynamic

Compute the length for this data-type which corresponds to the specified memory location.

Specified by:

getLength in interface Dynamic

Parameters:

buf - memory location

maxLength - maximum number of bytes to consume in computing length, or -1 for unspecified.

Returns:

data length or -1 if it could not be determined. Returned length may exceed maxLength if data-type does not supported constrained lengths.

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 DataTypeImpl

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.

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 AbstractDataType

Returns:

true if encoding is supported

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

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

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 AbstractDataType

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()).

getRepresentation

public String getRepresentation(MemBuffer buf,
 Settings settings,
 int length)

Description copied from interface: DataType

Get bytes from memory in a printable format for this type.

Specified by:

getRepresentation in interface DataType

Parameters:

buf - the data.

settings - the settings to use for the representation.

length - the number of bytes to represent.

Returns:

the representation of the data in this format, never null.

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 AbstractDataType

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()).

getDefaultLabelPrefix

public String getDefaultLabelPrefix(MemBuffer buf,
 Settings settings,
 int len,
 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

len - 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.

getDefaultOffcutLabelPrefix

public String getDefaultOffcutLabelPrefix(MemBuffer buf,
 Settings settings,
 int len,
 DataTypeDisplayOptions options,
 int offcutLength)

Description copied from interface: DataType

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

This takes into account the fact that there exists a reference to the data that references offcutLength bytes into this type

Specified by:

getDefaultOffcutLabelPrefix in interface DataType

Overrides:

getDefaultOffcutLabelPrefix in class AbstractDataType

Parameters:

buf - memory buffer containing the bytes.

settings - the Settings object

len - the length of the data.

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

offcutLength - offset into datatype

Returns:

the default label prefix.

getReplacementBaseType

public DataType getReplacementBaseType()

Description copied from interface: Dynamic

Returns a suitable replacement base data-type for pointers and arrays when exporting to C code

Specified by:

getReplacementBaseType in interface Dynamic

Returns:

suitable base data-type for this Dynamic data-type