private static Metadata readMetadataTable(FileStream metadataStream, int offset)
{
MetadataTableInfo info = readMetadataTableInfo(metadataStream, offset);
List <Tuple <int, byte[]> > table = new List <Tuple <int, byte[]> >();
int offs_acc = info.tableOffset.value;
for (int i = 0; i < info.numEntries; i++)
{
table.Add(readMetadataEntry(metadataStream, offs_acc));
offs_acc += metadataStream.ReadInt(offs_acc) + 4;
offs_acc = HexTools.align(offs_acc); //word align
}
Metadata ret = new Metadata();
ret.data = table;
ret.info = info;
return(ret);
}
public void writeMetadata()
{
//metadataStream.Seek(0, SeekOrigin.Begin);
//TODO
//Load all tables into RAM, erase the file, rewrite all the tables.
mainTable.info.numEntries = tables.Count;
metadataStream = File.Open(metadataPath, FileMode.Open);
MetadataTableInfo[] tableInfo = new MetadataTableInfo[tables.Count];
var myData = new List <Metadata>();
foreach (var table in tables)
{
myData.Add(table.Value);
}
for (int i = 0; i < tables.Count; i++)
{
tableInfo[i] = myData[i].info;
}
int [] tableInfoOffsets = new int[myData.Count];
int offs_acc = TABLE_INFO_SIZE;
for (int i = 0; i < myData.Count; i++)
{
tableInfoOffsets[i] = offs_acc;
MetadataTableInfo curTable;
curTable = myData[i].info;
offs_acc += TABLE_INFO_SIZE;
}
mainTable.info.tableOffset = new Pointer(offs_acc); //start of main data
//mainTable.data = new List<Tuple<int, byte[]>>();
//now write the main table
for (int i = 0; i < myData.Count; i++)
{
metadataStream.WriteInt(4, offs_acc);
offs_acc += 4;
metadataStream.WriteInt(tableInfoOffsets[i], offs_acc);
offs_acc += 4;
//mainTable.data.Add(Tuple.Create(4, BitConverter.GetBytes(tableInfoOffsets[i])));
}
//now write all the other tables' data
for (int i = 0; i < myData.Count; i++)
{
tableInfo[i].tableOffset = new Pointer(offs_acc);
for (int j = 0; j < myData[i].data.Count; j++)
{
int len = myData[i].data[j].Item1;
metadataStream.WriteInt(len, offs_acc); //length
offs_acc += 4;
metadataStream.Seek(offs_acc, SeekOrigin.Begin);
metadataStream.Write(myData[i].data[j].Item2, 0, len);
offs_acc += len;
int align_diff = HexTools.align(offs_acc) - offs_acc;
if (align_diff != 0)
{
byte[] alignment = new byte[align_diff];
Array.Clear(alignment, 0, align_diff);
metadataStream.Write(alignment, 0, align_diff);
}
offs_acc += align_diff;
}
}
metadataStream.SetLength(offs_acc);
//now go back to the top and write all the table data
writeMetadataTableInfo(metadataStream, mainTable.info, 0);
offs_acc = TABLE_INFO_SIZE;
for (int i = 0; i < myData.Count; i++)
{
writeMetadataTableInfo(metadataStream, tableInfo[i], offs_acc);
offs_acc += TABLE_INFO_SIZE;
}
mainTable = readMetadataTable(metadataStream, 0);
metadataStream.Flush();
metadataStream.Close();
//And we're done.
//All headers, then all data
//TableData1, TableData2, TableData3, . . .
//length, dataaaaaaaaaaaa; length, dataaaaaaaaaaaaa, . . .
}