Package ghidra.program.model.data

Class AbstractLeb128DataType

java.lang.Object
ghidra.program.model.data.AbstractDataType
ghidra.program.model.data.DataTypeImpl
ghidra.program.model.data.BuiltIn
ghidra.program.model.data.AbstractLeb128DataType
All Implemented Interfaces:
BuiltInDataType, DataType, Dynamic, ExtensionPoint
Direct Known Subclasses:
SignedLeb128DataType, UnsignedLeb128DataType
public abstract class AbstractLeb128DataType extends BuiltIn implements Dynamic
An abstract base class for a LEB128 variable length integer data type.

See LEB128.

  • Constructor Details

    • AbstractLeb128DataType

      public AbstractLeb128DataType(String name, boolean signed, DataTypeManager dtm)
      Base constructor for a little endian based 128 data type.
      Parameters:
      name - name of the leb128 data type that extends this class.
      signed - true if it is signed. false if unsigned.
      dtm - the data type manager to associate with this data type.

  • Method Details

    • 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.

    • 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

    • 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.

    • getValue

      public Object getValue(MemBuffer buf, Settings settings, int maxLength)
      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.
      maxLength - 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

    • 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.

    • 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

    • 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

    • 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.