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));
}
public MegFile FromBytes(byte[] byteStream)
{
if (byteStream == null || byteStream.Length < 1)
{
throw new ArgumentNullException(nameof(byteStream), "The provided file is empty.");
}
MegHeader header = BuildMegHeaderInternal(byteStream);
MegFileNameTable megFileNameTable = BuildFileNameTableInternal(byteStream);
MegFileContentTable megFileContentTable = BuildFileContentTableInternal(byteStream);
return(new MegFile(header, megFileNameTable, megFileContentTable));
}
public MegFile Build(byte[] megFileBytes)
{
if (megFileBytes == null || megFileBytes.Length < 1)
{
throw new ArgumentNullException(nameof(megFileBytes), "The provided file is empty.");
}
MegHeader header = BuildMegHeader(megFileBytes);
MegFileNameTable megFileNameTable = BuildFileNameTable(megFileBytes);
MegFileContentTable megFileContentTable = BuildFileContentTable(megFileBytes);
return(new MegFile(header, megFileNameTable, megFileContentTable));
}
public MegFile FromHolder(MegFileHolder holder, out IList <string> filesToStream)
{
List <string> files = holder.Content.Select(megFileDataEntry => megFileDataEntry.RelativeFilePath).ToList();
List <MegFileNameTableRecord> megFileNameTableRecords =
files.Select(file => new MegFileNameTableRecord(file)).ToList();
megFileNameTableRecords.Sort();
filesToStream = new List <string>();
foreach (MegFileNameTableRecord megFileNameTableRecord in megFileNameTableRecords)
{
foreach (MegFileDataEntry megFileDataEntry in CollectSortedMegFileDataEntries(holder, megFileNameTableRecord))
{
filesToStream.Add(megFileDataEntry.AbsoluteFilePath);
break;
}
}
List <MegFileContentTableRecord> megFileContentTableRecords = new List <MegFileContentTableRecord>();
for (int i = 0; i < megFileNameTableRecords.Count; i++)
{
uint crc32 = ChecksumUtility.GetChecksum(megFileNameTableRecords[i].FileName);
uint fileTableRecordIndex = Convert.ToUInt32(i);
uint fileSizeInBytes = Convert.ToUInt32(m_fileSystem.FileInfo.FromFileName(filesToStream[i]).Length);
uint fileNameTableIndex = Convert.ToUInt32(i);
megFileContentTableRecords.Add(new MegFileContentTableRecord(crc32, fileTableRecordIndex,
fileSizeInBytes, 0, fileNameTableIndex));
}
MegHeader header = new MegHeader(Convert.ToUInt32(megFileContentTableRecords.Count),
Convert.ToUInt32(megFileContentTableRecords.Count));
MegFileNameTable megFileNameTable = new MegFileNameTable(megFileNameTableRecords);
uint currentOffset = Convert.ToUInt32(header.Size);
currentOffset += Convert.ToUInt32(megFileNameTable.Size);
MegFileContentTable t = new MegFileContentTable(megFileContentTableRecords);
currentOffset += Convert.ToUInt32(t.Size);
foreach (MegFileContentTableRecord megFileContentTableRecord in megFileContentTableRecords)
{
megFileContentTableRecord.FileStartOffsetInBytes = currentOffset;
currentOffset += Convert.ToUInt32(megFileContentTableRecord.FileSizeInBytes);
}
MegFileContentTable megFileContentTable = new MegFileContentTable(megFileContentTableRecords);
return(new MegFile(header, megFileNameTable, megFileContentTable));
}
public MegFile Build(MegFileAttribute megFileAttribute)
{
MegHeader megHeader = BuildMegHeader(megFileAttribute);
MegFileNameTable megFileNameTable = BuildFileNameTable(megFileAttribute);
//uint currentFileSize = megHeader.Size() + megFileNameTable.Size();
MegFileContentTable megFileContentTable =
BuildFileContentTables(megFileAttribute, megFileNameTable);
//BuildFileContentTable(megFileAttribute, megFileNameTable, currentFileSize);
MegFile megFile =
new MegFile(megHeader, megFileNameTable, megFileContentTable)
{
Files = megFileAttribute.ContentFiles.ToList()
};
return(megFile);
}
public MegFile FromHolder(MegFileHolder holder)
{
List <string> files = holder.Content.Select(megFileDataEntry => megFileDataEntry.RelativeFilePath).ToList();
List <MegFileNameTableRecord> megFileNameTableRecords =
files.Select(file => new MegFileNameTableRecord(file)).ToList();
megFileNameTableRecords.Sort();
// Workaround for Unix compatibility.
// File names are always stored as uppercase and without delimiter (\0), but Unix's file system is case sensitive,
// so we cache the proper file paths sorted by the "cleaned" version's CRC for quick access later.
List <string> sortedFiles = (from megFileNameTableRecord in megFileNameTableRecords
from file in files
where megFileNameTableRecord.FileName.Equals(file, StringComparison.InvariantCultureIgnoreCase)
select file).ToList();
List <MegFileContentTableRecord> megFileContentTableRecords = new List <MegFileContentTableRecord>();
for (int i = 0; i < megFileNameTableRecords.Count; i++)
{
uint crc32 = ChecksumUtility.GetChecksum(megFileNameTableRecords[i].FileName);
uint fileTableRecordIndex = Convert.ToUInt32(i);
uint fileSizeInBytes = Convert.ToUInt32(m_fileSystem.FileInfo
.FromFileName(
m_fileSystem.Path.GetFullPath(m_fileSystem.Path.Combine(holder.FilePath, sortedFiles[i])))
.Length);
uint fileNameTableIndex = Convert.ToUInt32(i);
megFileContentTableRecords.Add(new MegFileContentTableRecord(crc32, fileTableRecordIndex,
fileSizeInBytes, 0, fileNameTableIndex));
}
MegHeader header = new MegHeader(Convert.ToUInt32(megFileContentTableRecords.Count),
Convert.ToUInt32(megFileContentTableRecords.Count));
MegFileNameTable megFileNameTable = new MegFileNameTable(megFileNameTableRecords);
uint currentOffset = Convert.ToUInt32(header.Size);
currentOffset += Convert.ToUInt32(megFileNameTable.Size);
MegFileContentTable t = new MegFileContentTable(megFileContentTableRecords);
currentOffset += Convert.ToUInt32(t.Size);
foreach (MegFileContentTableRecord megFileContentTableRecord in megFileContentTableRecords)
{
megFileContentTableRecord.FileStartOffsetInBytes = currentOffset;
currentOffset += Convert.ToUInt32(megFileContentTableRecord.FileSizeInBytes);
}
MegFileContentTable megFileContentTable = new MegFileContentTable(megFileContentTableRecords);
return(new MegFile(header, megFileNameTable, megFileContentTable));
}
