public GPakReader(string filename)
{
PackagePath = GPakUtil.GetPackageFileName(filename);
PackageName = Path.GetFileName(PackagePath);
if (File.Exists(PackagePath))
{
PackageFileSize = (int)new FileInfo(PackagePath).Length;
_packageFileReader = new BinaryReader(File.Open(PackagePath, System.IO.FileMode.Open));
if (IsHeaderValid())
{
_entryTable = new Dictionary <string, GPakEntry>();
ReadEntries();
}
else
{
throw new Exception("Invalid Header");
}
}
else
{
throw new FileNotFoundException(PackagePath + " does not found.");
}
}
public GPakWriter(string filename)
{
_packageFilename = GPakUtil.GetPackageFileName(filename);
bool doesFileExist = File.Exists(_packageFilename);
StartWriting();
if (!doesFileExist)
{
WriteHeader();
}
EndWriting();
}
public void AddEntry(string filename, bool shouldCompress)
{
if (!File.Exists(filename))
{
throw new FileNotFoundException(filename + " could not be opened!");
}
if (filename.Length > byte.MaxValue)
{
throw new ConstraintException("file name length can't be greater than " + byte.MaxValue);
}
StartWriting();
var fi = new FileInfo(filename);
// Write file name
var fnLength = Encoding.ASCII.GetByteCount(fi.Name);
var fnContent = Encoding.ASCII.GetBytes(fi.Name);
_fileWriter.Write(fnLength);
_fileWriter.Write(fnContent);
// Write file content
int fSize;
var fContent = File.ReadAllBytes(filename);
if (shouldCompress)
{
var compressedFContent = GPakUtil.Compress(fContent);
fSize = compressedFContent.Length;
fContent = compressedFContent;
_fileWriter.Write('C');
}
else
{
fSize = Convert.ToInt32(fi.Length);
fContent = File.ReadAllBytes(filename);
_fileWriter.Write('N');
}
_fileWriter.Write(fSize);
_fileWriter.Write(fContent);
EndWriting();
}
public byte[] GetEntryContent(string entryName)
{
var entry = _entryTable[entryName];
if (entry == null)
{
return(null);
}
var extractReader = new BinaryReader(File.Open(PackagePath, System.IO.FileMode.Open));
var result = entry.IsCompressed
? GPakUtil.Decompress(GPakUtil.GetBytesFromFile(extractReader, entry.ContentOffset, entry.SizeInBytes))
: GPakUtil.GetBytesFromFile(extractReader, entry.ContentOffset, entry.SizeInBytes);
extractReader.Close();
return(result);
}
public void ExtractAll(string toDirectory = "")
{
if (toDirectory != "" && !Directory.Exists(toDirectory))
{
Directory.CreateDirectory(toDirectory);
}
var extractReader = new BinaryReader(File.Open(PackagePath, System.IO.FileMode.Open));
foreach (var(name, entry) in _entryTable)
{
var writer = new BinaryWriter(File.Open(Path.Combine(toDirectory, name), System.IO.FileMode.Create));
writer.Write(entry.IsCompressed
? GPakUtil.Decompress(GPakUtil.GetBytesFromFile(extractReader, entry.ContentOffset, entry.SizeInBytes))
: GPakUtil.GetBytesFromFile(extractReader, entry.ContentOffset, entry.SizeInBytes));
writer.Close();
}
extractReader.Close();
}
private void ReadEntries()
{
int i = GPakUtil.FirstEntryOffset;
while (i < PackageFileSize)
{
// Read 4 bytes to find the length of the entry's name
var entryNameLength =
GPakUtil.GetByteRangeAsInteger(GPakUtil.GetBytesFromFile(_packageFileReader, i, 4));
i += 4;
// Read ENTRY_NAME bytes to obtain it's name
var entryName =
GPakUtil.GetByteRangeAsString(GPakUtil.GetBytesFromFile(_packageFileReader, i, entryNameLength));
i += entryName.Length;
// Read 1 byte to check if the entry is compressed or not ("C" for compressed, "N" for not compressed)
var compressedFlag =
GPakUtil.GetByteRangeAsString(GPakUtil.GetBytesFromFile(_packageFileReader, i, 1));
i += 1;
var isCompressed = compressedFlag == "C";
// Read 4 bytes to get the size of the entry in the package
var entryContentSize =
GPakUtil.GetByteRangeAsInteger(GPakUtil.GetBytesFromFile(_packageFileReader, i, 4));
i += 4;
// Create a new entry based on the previously gathered info
_entryTable.Add(entryName, new GPakEntry(entryContentSize, isCompressed, i));
i += entryContentSize;
EntryCount++;
}
_packageFileReader.Close();
}
private bool IsHeaderValid()
{
var header = GPakUtil.GetBytesFromFile(_packageFileReader, 0, GPakUtil.FirstEntryOffset);
return(GPakUtil.GetByteRangeAsString(header).Equals(GPakUtil.Header));
}
