/// <summary>
/// <para>This constructor is used solely for extracting XML
/// data from a BAR file without leaving the XMB file sitting
/// around on the hard disk.</para>
///
/// <para>The method works by saving the file in its native
/// XMB form, and then setting the class attributes to focus
/// on extracting that file. Then the saveXMB method will
/// extract from this temporary file, and once this class is
/// disposed of and the destructor is called the temporary
/// file will be deleted.</para>
/// </summary>
/// <param name="entry">The BAR file entry to be saved to XML.</param>
/// <param name="saveDirectory">The directory to save the new XML
/// file to (leave blank for the same directory as the program).</param>
public XMBReader(BarEntry entry, string saveDirectory)
{
// Set up instance variables...
xmbFilePath = entry.fileName + ".tmp";
xmlFilePath = saveDirectory + "\\" + entry.fileName.Substring(0, entry.fileName.LastIndexOf('.'));
fileLength = 0;
// Create a BarReader and save the file we need
// to the temporary destination (as the XMB file)
BarReader reader = new BarReader(entry.barFilePath);
reader.saveFile(entry,xmbFilePath);
// Set the temporary file flag
isTemporaryFile = true;
}
/// <summary>
/// Saves a file to program's location, this method
/// works simply by calling the main saveFile method and
/// specifying a blank string in place of the path.
/// </summary>
/// <param name="file">BarEntry object detailing the file to be saved</param>
private void saveFile(BarEntry file)
{
saveFile(file, "");
}
/// <summary>
/// The load method will load the BAR file that has been
/// specified by the constructor. It returns a bool
/// value specifying whether the operation has been
/// successful.
/// </summary>
/// <returns>True if the BAR file has been loaded
/// successfully, otherwise false.</returns>
public bool load()
{
// We will be throwing exceptions about the
// place, so we'd best try to be safe...
try
{
// Does the BAR file even exist?
if (!File.Exists(barFilePath))
throw new Exception("BAR file does not exist!");
// Declare some variables
uint numFiles, filetableOffset, numRootFiles;
int tempInt;
string tempString, rootName;
// Instantiate and open the filestream
// to the bar file.
input = new FileStream(barFilePath, FileMode.Open);
// Now, start checking through the first
// few bytes of the file to see if this is
// a valid BAR file.
// BAR files always start with a four byte string "ESPN"
tempString = ByteReader.readString(input, 4);
if (tempString != "ESPN")
throw new Exception("'ESPN' not detected - Not a valid BAR file!");
// Afterwards they feature a four byte integer value "2"
tempInt = ByteReader.readInt(input, 4);
if (tempInt != 2)
throw new Exception("'2' not detected - Not a valid BAR file!");
// Next they feature a four byte hex value of 0x44332211
tempInt = ByteReader.readInt(input, 4);
if (tempInt != 0x44332211)
throw new Exception("'0x44332211' not detected - Not a valid BAR file!");
// Lastly they always feature a large block of zero values
bool allZeroes = true;
for (int i = 0; i < 66; ++i)
{
tempInt = ByteReader.readInt(input, 4);
if (tempInt != 0)
allZeroes = false;
}
if (!allZeroes)
throw new Exception("Successive zeroes not detected - Not a valid BAR file!");
// Unknown value - This is possibly a checksum, for
// now however it is ignored.
tempInt = ByteReader.readInt(input, 4);
// Now the number of files stored within the BAR file
// are located.
numFiles = ByteReader.readUInt(input, 4);
// Are there actually any files?
if (numFiles == 0)
throw new Exception("No files stored - This is an empty / invalid BAR file!");
// Next is the offset for the file table, where the
// contents of this BAR file are located.
filetableOffset = ByteReader.readUInt(input, 4);
// Is this actually a number?
if (filetableOffset == 0)
throw new Exception("File table offset blank - Not a valid BAR file!");
// Now another 4 bytes of zeroes are located before
// the actual data starts.
tempInt = ByteReader.readInt(input, 4);
if (tempInt != 0)
throw new Exception("Zeroes not detected - Not a valid BAR file!");
// If an exception has not been thrown thus far then
// this is a valid BAR file and we can hopefully
// proceed to the file table and start learning what
// is locked inside!
// Start by going to the location of the file table...
input.Seek(filetableOffset, SeekOrigin.Begin);
// Now we should be able to read the root name of this
// BAR file.
rootName = ByteReader.readFullString(input);
// The number of files should also be listed here, get
// it and check it matched the number of files given
// earlier.
numRootFiles = ByteReader.readUInt(input, 4);
if (numRootFiles != numFiles)
throw new Exception("File total mismatch - Not a valid BAR file!");
// Now we can start looping throough the files in the
// file table, saving their details in the files List.
for (int fileIndex = 0; fileIndex < numFiles; fileIndex++)
{
// Create a new BAR Entry to take the data
BarEntry file = new BarEntry();
// Read in the offset for this file (its location
// within the bar file)
file.offset = ByteReader.readUInt(input, 4);
// Check the file size for this file, it is
// listed twice so compare the values are equal.
uint length1 = ByteReader.readUInt(input, 4);
uint length2 = ByteReader.readUInt(input, 4);
// Only proceed if they are equal...
if (length1 == length2)
{
// This file is apparently valid, so
// store the length.
file.fileSize = length1;
// Now store the date information...
file.year = ByteReader.readUShort(input, 2);
file.month = ByteReader.readUShort(input, 2);
file.dayOfWeek = ByteReader.readUShort(input, 2);
file.day = ByteReader.readUShort(input, 2);
file.hour = ByteReader.readUShort(input, 2);
file.minute = ByteReader.readUShort(input, 2);
file.second = ByteReader.readUShort(input, 2);
file.msecond = ByteReader.readUShort(input, 2);
// If there's no data stored, as
// indicated with the 0xCCCC pattern,
// clear all date information.
if (file.year == 0xCCCC)
file.clearDate();
// Get the path of the file and set it
file.filePath = ByteReader.readFullString(input);
// Then set the full path of the BAR file
file.barFilePath = barFilePath;
// Lastly add this file to the List
files.Add(file);
}
}
// Have we made it this far? We must have
// been successful, return true.
return true;
}
catch (Exception e)
{
// An error has occurred. Return false!
return false;
}
finally
{
// Make sure that whatever happens the file
// stream is closed!
if (input != null)
input.Close();
}
}
/// <summary>
/// Saves a file that is stored in the BAR file to an external file. The name
/// and path for the file is specified by the file itself, however the root of that
/// path can be defined by the user (or if left blank will be the directory the
/// program is running).
/// </summary>
/// <param name="file">The BarEntry object detailing the file to be saved</param>
/// <param name="savePath">The path where the item is to be saved (blank for the current directory)</param>
public void saveFile(BarEntry file, string savePath)
{
// Could be doing some risky stuff here, so try...
try
{
// Firstly, is the file parameter null?
if (file == null)
throw new Exception("Supplied file was null - Could not save!");
// Instantiate the input stream, opening the BAR
// file specified in the barFilePath variable
input = new FileStream(barFilePath, FileMode.Open);
// Locate the file within the BAR file.
input.Seek(file.offset, SeekOrigin.Begin);
// Work out the full path of the file to be saved.
string newPath = savePath;
// Work out the directory path where the file is to be saved...
string dirPath = newPath.Substring(0, newPath.LastIndexOf('\\') + 1);
// ...Now check that the directories exist! If the
// directories don't exist then the path must be created!
// Of course, that's only if we *need* directories.
if (dirPath != "")
{
if (!Directory.Exists(dirPath))
Directory.CreateDirectory(dirPath);
}
// Now using a FileStream / BinaryWriter combo, write the data as it is
// read from the BAR file to the new file (which will be overwritten if
// it already exists, perhaps a bool check method could be used to make
// sure the user doesn't overwrite something they've modded?)
using (FileStream output = new FileStream(newPath, FileMode.Create))
{
using (BinaryWriter writer = new BinaryWriter(output))
{
// How many bytes are left? Well currently all of them!
uint bytesRemaining = file.fileSize;
// Define a 128K buffer (this is what AoE3Ed uses and
// it seems to work perfectly).
uint bufferSize = 128 * 1024;
byte[] buffer = new byte[bufferSize];
// Now loop through the file as long as there are bytes
// remaining.
while (bytesRemaining > 0)
{
// If the buffer is still smaller than the file
// then use it as is, then remove the buffer size
// from bytes remaining. Otherwise resize the
// buffer and read only what is needed before
// setting the buffer to zero to end the loop.
if (bytesRemaining >= bufferSize)
{
input.Read(buffer, 0, (int)bufferSize);
bytesRemaining -= bufferSize;
}
else
{
buffer = new byte[bytesRemaining];
input.Read(buffer, 0, (int)bytesRemaining);
bytesRemaining = 0;
}
// Write the contents of the buffer to the file!
writer.Write(buffer);
}
// Once we're finished we need to close the writer.
writer.Close();
}
}
}
catch (Exception e)
{
// Have we caught an exception? Tell the user
// about it...
Console.Out.WriteLine(e.StackTrace);
}
finally
{
// Ensure the input is closed
input.Close();
}
}
