Class FileInfo

java.lang.Object

FileInfo

public class FileInfo
extends java.lang.Object

This class has methods for reading the contents of the disk.

Author:

Petros Soutzis

Constructor Summary

Constructors

Constructor and Description
FileInfo()

Method Summary

Modifier and Type	Method and Description
private static void	printBlockData(int blockNumber, int inodeSize, boolean isFile, Ext2File ext2, Superblock superblock, GroupDescriptor groupDescriptor) This method will print the data contained in a file or the metadata from the inode, if it is a Directory
private static void	readBlockData(Inode inode, boolean isFile, int inodeSize, Ext2File ext2, Superblock superblock, GroupDescriptor groupDescriptor) This method will readBytes the block pointers values of an inode and if a pointer points to real data, it will call the appropriate methods to print that data.
(package private) static void	readDirectoryData(Inode inode, int inodeSize, Ext2File ext2, Superblock superblock, GroupDescriptor groupDescriptor) This method will be used to display contents of a directory
private static void	readDoubleIndirectData(int blockNumber, int inodeSize, boolean isFile, Ext2File ext2, Superblock superblock, GroupDescriptor groupDescriptor) This method will readBytes the double indirect data block and if data exists it will call readIndirectData()
(package private) static void	readFileData(Inode inode, int inodeSize, Ext2File ext2, Superblock superblock, GroupDescriptor groupDescriptor, java.lang.String path) This method will be used to print the contents of a file
(package private) void	readHexData(java.util.ArrayList<byte[]> raw) This method will readBytes byte arrays from a list of byte arrays and print the content in a readable Hexadecimal format, with 26 hex characters in each line for readability
private static void	readIndirectData(int blockNumber, int inodeSize, boolean isFile, Ext2File ext2, Superblock superblock, GroupDescriptor groupDescriptor) This method will readBytes the indirect data block and if data exists it will call printBlockData()
private static void	readTripleIndirectData(int blockNumber, int inodeSize, boolean isFile, Ext2File ext2, Superblock superblock, GroupDescriptor groupDescriptor) This method will readBytes the triple indirect data block and if data exists it will call readDoubleIndirectData()

Methods inherited from class java.lang.Object

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

Constructor Detail

FileInfo

public FileInfo()

Method Detail

readHexData

void readHexData(java.util.ArrayList<byte[]> raw)

This method will readBytes byte arrays from a list of byte arrays and print the content in a readable Hexadecimal format, with 26 hex characters in each line for readability

Parameters:

raw - is the ArrayList with bytes that this method will readBytes and print as hex

readDirectoryData

static void readDirectoryData(Inode inode,
                              int inodeSize,
                              Ext2File ext2,
                              Superblock superblock,
                              GroupDescriptor groupDescriptor)
                       throws java.io.IOException

This method will be used to display contents of a directory

Parameters:

inode - The inode of the given path

inodeSize - The size of the inode

ext2 - The disk

superblock - The superblock

groupDescriptor - The group descriptor

Throws:

java.io.IOException - If the disk can't be read

readFileData

static void readFileData(Inode inode,
                         int inodeSize,
                         Ext2File ext2,
                         Superblock superblock,
                         GroupDescriptor groupDescriptor,
                         java.lang.String path)
                  throws java.io.IOException

This method will be used to print the contents of a file

Parameters:

inode - The inode of the given path

inodeSize - The size of the inode

ext2 - The disk

superblock - The superblock

groupDescriptor - The group descriptor

path - The path that was entered by the user

Throws:

java.io.IOException - If the disk can't be read

readBlockData

private static void readBlockData(Inode inode,
                                  boolean isFile,
                                  int inodeSize,
                                  Ext2File ext2,
                                  Superblock superblock,
                                  GroupDescriptor groupDescriptor)
                           throws java.io.IOException

This method will readBytes the block pointers values of an inode and if a pointer points to real data, it will call the appropriate methods to print that data.

Parameters:

inode - is the Inode, whose block pointers will be readBytes

Throws:

java.io.IOException - e

printBlockData

private static void printBlockData(int blockNumber,
                                   int inodeSize,
                                   boolean isFile,
                                   Ext2File ext2,
                                   Superblock superblock,
                                   GroupDescriptor groupDescriptor)
                            throws java.io.IOException

This method will print the data contained in a file or the metadata from the inode, if it is a Directory

Parameters:

blockNumber - is the offset of the data, obtained by the direct pointers to data in the inode.

Throws:

java.io.IOException - e

readIndirectData

private static void readIndirectData(int blockNumber,
                                     int inodeSize,
                                     boolean isFile,
                                     Ext2File ext2,
                                     Superblock superblock,
                                     GroupDescriptor groupDescriptor)
                              throws java.io.IOException

This method will readBytes the indirect data block and if data exists it will call printBlockData()

Parameters:

blockNumber - is the offset of the data, obtained by the block pointers from the inode.

Throws:

java.io.IOException - e

readDoubleIndirectData

private static void readDoubleIndirectData(int blockNumber,
                                           int inodeSize,
                                           boolean isFile,
                                           Ext2File ext2,
                                           Superblock superblock,
                                           GroupDescriptor groupDescriptor)
                                    throws java.io.IOException

This method will readBytes the double indirect data block and if data exists it will call readIndirectData()

Parameters:

blockNumber - is the offset of the data, obtained by the block pointers from the inode.

Throws:

java.io.IOException - e

readTripleIndirectData

private static void readTripleIndirectData(int blockNumber,
                                           int inodeSize,
                                           boolean isFile,
                                           Ext2File ext2,
                                           Superblock superblock,
                                           GroupDescriptor groupDescriptor)
                                    throws java.io.IOException

This method will readBytes the triple indirect data block and if data exists it will call readDoubleIndirectData()

Parameters:

blockNumber - is the offset of the data, obtained by the block pointers from the inode.

Throws:

java.io.IOException - e