Package ghidra.framework.store.local

Class LocalDataFileHandle

java.lang.Object

ghidra.framework.store.local.LocalDataFileHandle

All Implemented Interfaces:

DataFileHandle

public class LocalDataFileHandle
extends java.lang.Object
implements DataFileHandle

LocalDataFileHandle provides random access to a local File.

Constructor Summary

Constructors

Constructor	Description
LocalDataFileHandle(java.io.File file, boolean readOnly)	Construct and open a local DataFileHandle.

Method Summary

Modifier and Type	Method	Description
void	close()	Closes this random access file stream and releases any system resources associated with the stream.
boolean	isReadOnly()	Returns true if this data file handle is open read-only.
long	length()	Returns the length of this file.
void	read(byte[] b)	Reads b.length bytes from this file into the byte array, starting at the current file pointer.
void	read(byte[] b, int off, int len)	Reads exactly len bytes from this file into the byte array, starting at the current file pointer.
void	seek(long pos)	Sets the file-pointer offset, measured from the beginning of this file, at which the next read or write occurs.
void	setLength(long newLength)	Sets the length of this file.
int	skipBytes(int n)	Attempts to skip over n bytes of input discarding the skipped bytes.
void	write(byte[] b)	Writes b.length bytes from the specified byte array to this file, starting at the current file pointer.
void	write(byte[] b, int off, int len)	Writes len bytes from the specified byte array starting at offset off to this file.
void	write(int b)	Writes the specified byte to this file.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LocalDataFileHandle

public LocalDataFileHandle(java.io.File file,
                           boolean readOnly)
                    throws java.io.IOException

Construct and open a local DataFileHandle.

Parameters:

file - file to be opened

readOnly - if true resulting handle may only be read.

Throws:

java.io.FileNotFoundException - if file was not found

java.io.IOException - if an IO Error occurs

Method Detail

read

public void read(byte[] b)
          throws java.io.IOException

Description copied from interface: DataFileHandle

Reads b.length bytes from this file into the byte array, starting at the current file pointer. This method reads repeatedly from the file until the requested number of bytes are read. This method blocks until the requested number of bytes are read, the end of the stream is detected, or an exception is thrown.

Specified by:

read in interface DataFileHandle

Parameters:

b - the buffer into which the data is read.

Throws:

java.io.EOFException - if this file reaches the end before reading all the bytes.

java.io.IOException - if an I/O error occurs.

read

public void read(byte[] b,
                 int off,
                 int len)
          throws java.io.IOException

Description copied from interface: DataFileHandle

Reads exactly len bytes from this file into the byte array, starting at the current file pointer. This method reads repeatedly from the file until the requested number of bytes are read. This method blocks until the requested number of bytes are read, the end of the stream is detected, or an exception is thrown.

Specified by:

read in interface DataFileHandle

Parameters:

b - the buffer into which the data is read.

off - the start offset of the data.

len - the number of bytes to read.

Throws:

java.io.EOFException - if this file reaches the end before reading all the bytes.

java.io.IOException - if an I/O error occurs.

skipBytes

public int skipBytes(int n)
              throws java.io.IOException

Description copied from interface: DataFileHandle

Attempts to skip over n bytes of input discarding the skipped bytes.

This method may skip over some smaller number of bytes, possibly zero. This may result from any of a number of conditions; reaching end of file before n bytes have been skipped is only one possibility. This method never throws an EOFException. The actual number of bytes skipped is returned. If n is negative, no bytes are skipped.

Specified by:

skipBytes in interface DataFileHandle

Parameters:

n - the number of bytes to be skipped.

Returns:

the actual number of bytes skipped.

Throws:

java.io.IOException - if an I/O error occurs.

write

public void write(int b)
           throws java.io.IOException

Description copied from interface: DataFileHandle

Writes the specified byte to this file. The write starts at the current file pointer.

Specified by:

write in interface DataFileHandle

Parameters:

b - the byte to be written.

Throws:

java.io.IOException - if an I/O error occurs.

write

public void write(byte[] b)
           throws java.io.IOException

Description copied from interface: DataFileHandle

Writes b.length bytes from the specified byte array to this file, starting at the current file pointer.

Specified by:

write in interface DataFileHandle

Parameters:

b - the data.

Throws:

java.io.IOException - if an I/O error occurs.

write

public void write(byte[] b,
                  int off,
                  int len)
           throws java.io.IOException

Description copied from interface: DataFileHandle

Writes len bytes from the specified byte array starting at offset off to this file.

Specified by:

write in interface DataFileHandle

Parameters:

b - the data.

off - the start offset in the data.

len - the number of bytes to write.

Throws:

java.io.IOException - if an I/O error occurs.

seek

public void seek(long pos)
          throws java.io.IOException

Description copied from interface: DataFileHandle

Sets the file-pointer offset, measured from the beginning of this file, at which the next read or write occurs. The offset may be set beyond the end of the file. Setting the offset beyond the end of the file does not change the file length. The file length will change only by writing after the offset has been set beyond the end of the file.

Specified by:

seek in interface DataFileHandle

Parameters:

pos - the offset position, measured in bytes from the beginning of the file, at which to set the file pointer.

Throws:

java.io.IOException - if pos is less than 0 or if an I/O error occurs.

length

public long length()
            throws java.io.IOException

Description copied from interface: DataFileHandle

Returns the length of this file.

Specified by:

length in interface DataFileHandle

Returns:

the length of this file, measured in bytes.

Throws:

java.io.IOException - if an I/O error occurs.

setLength

public void setLength(long newLength)
               throws java.io.IOException

Description copied from interface: DataFileHandle

Sets the length of this file.

If the present length of the file as returned by the length method is greater than the newLength argument then the file will be truncated. In this case, if the file offset as returned by the getFilePointer method is greater then newLength then after this method returns the offset will be equal to newLength.

If the present length of the file as returned by the length method is smaller than the newLength argument then the file will be extended. In this case, the contents of the extended portion of the file are not defined.

Specified by:

setLength in interface DataFileHandle

Parameters:

newLength - The desired length of the file

Throws:

java.io.IOException - If an I/O error occurs

close

public void close()
           throws java.io.IOException

Description copied from interface: DataFileHandle

Closes this random access file stream and releases any system resources associated with the stream. A closed random access file cannot perform input or output operations and cannot be reopened.

Specified by:

close in interface DataFileHandle

Throws:

java.io.IOException - if an I/O error occurs.

isReadOnly

public boolean isReadOnly()
                   throws java.io.IOException

Description copied from interface: DataFileHandle

Returns true if this data file handle is open read-only.

Specified by:

isReadOnly in interface DataFileHandle

Throws:

java.io.IOException - if an I/O error occurs.