private MegFileContentTable BuildFileContentTables(MegFileAttribute megFileAttribute,
MegFileNameTable megFileNameTable)
{
List <string> absoluteFilePaths = megFileAttribute.ContentFiles.ToList();
List <MegFileContentTableRecord> megFileContentList = new List <MegFileContentTableRecord>();
uint currentOffset = new MegHeader(0, 0).Size();
currentOffset += megFileNameTable.Size();
for (int i = 0; i < megFileNameTable.MegFileNameTableRecords.Count; i++)
{
uint crc32 = ChecksumUtility.GetChecksum(megFileNameTable.MegFileNameTableRecords[i].FileName);
uint fileSizeInBytes = Convert.ToUInt32(new FileInfo(absoluteFilePaths[i]).Length);
uint fileNameTableIndex = Convert.ToUInt32(i);
MegFileContentTableRecord megFileContentTableRecord = new MegFileContentTableRecord(crc32, 0, fileSizeInBytes, 0, fileNameTableIndex);
megFileContentList.Add(megFileContentTableRecord);
currentOffset += megFileContentTableRecord.Size();
}
megFileContentList.Sort();
for (int i = 0; i < megFileContentList.Count; i++)
{
megFileContentList[i].FileTableRecordIndex = Convert.ToUInt32(i);
megFileContentList[i].FileStartOffsetInBytes = currentOffset;
currentOffset += megFileContentList[i].FileSizeInBytes;
}
return(new MegFileContentTable(megFileContentList));
}
private static void UnpackFile(string targetDirectory, MegFileContentTableRecord megFileContentTableRecord, MegFile megFile, BinaryReader reader)
{
byte[] file = new byte[megFileContentTableRecord.FileSizeInBytes];
string fileName = megFile.FileNameTable.MegFileNameTableRecords[Convert.ToInt32(megFileContentTableRecord.FileNameTableRecordIndex)].FileName;
reader.BaseStream.Seek(Convert.ToInt32(megFileContentTableRecord.FileStartOffsetInBytes), SeekOrigin.Begin);
reader.Read(file, 0, file.Length);
string path = Path.Combine(targetDirectory, fileName);
PathUtility.CreatePath(Path.GetDirectoryName(path));
using (BinaryWriter writer = new BinaryWriter(File.Open(path, FileMode.Create)))
{
writer.Write(file);
}
}
internal static uint GetMegFileHeaderSize(string megFilePath)
{
uint headerSize = 0;
using (BinaryReader reader = new BinaryReader(new FileStream(megFilePath, FileMode.Open)))
{
uint containedFiles = reader.ReadUInt32();
uint currentOffset = sizeof(uint) * 2;
for (uint i = 0; i < containedFiles; i++)
{
reader.BaseStream.Seek(currentOffset, SeekOrigin.Begin);
ushort fileNameLenght = reader.ReadUInt16();
currentOffset += Convert.ToUInt32(sizeof(ushort) + fileNameLenght);
}
headerSize += currentOffset;
uint megContentTableRecordSize = new MegFileContentTableRecord(0, 0, 0, 0, 0).Size();
headerSize += megContentTableRecordSize * containedFiles;
}
return(headerSize);
}
