public static IReadOnlyList <TXString> ReadStrings(Stream stream)
{
unsafe
{
TXHeader header = stream.ReadStruct <TXHeader>();
header.Check();
Int32 count = header.Count;
// Int32 dataSize = header.DataSize;
Int32 headerSize = count * sizeof(TXEntry);
Byte[] entriesHeader = stream.ReadBytes(headerSize);
Byte[] data = stream.ReadToEnd(); // .ReadBytes(dataSize); https://github.com/Albeoris/Septerra/issues/1
List <TXString> result = new List <TXString>(count);
fixed(Byte *entriesPtr = entriesHeader)
fixed(Byte * dataPtr = data)
{
TXEntry *entries = (TXEntry *)entriesPtr;
SByte * str = (SByte *)dataPtr;
for (Int32 i = 0; i < count; i++)
{
TXEntry entry = entries[i];
Int32 offset = checked ((Int32)(entry.Offset - headerSize - sizeof(TXHeader)));
Int32 size = 0;
for (Int32 c = 0; c < entry.Size; c++)
{
if (offset + c >= data.Length)
{
throw new EndOfStreamException($"Entry: {i}, Offset: {offset}, Size: {entry.Size} is out of data segment: {data.Length}");
}
SByte ch = str[offset + c];
if (ch == 0)
{
break;
}
str[offset + c] = (SByte)TXEncoding.ToText((Byte)ch);
size++;
}
String line = new String(str, offset, size);
result.Add(new TXString(entry.Index, line));
}
return(result);
}
}
}
public static void WriteStrings(Stream output, IReadOnlyList <TXString> lines)
{
unsafe
{
Int32 size = GetSize(lines);
if (output.CanSeek)
{
Int64 diff = size - (output.Length - output.Position);
if (diff > 0)
{
output.SetLength(output.Length + diff);
}
}
UInt32 magicNumber = TXHeader.KnownMagicNumber;
Int32 count = lines.Count;
Int32 headerSize = count * sizeof(TXEntry);
Int32 dataSize = size - sizeof(TXHeader) - headerSize;
BinaryWriter bw = new BinaryWriter(output);
bw.Write(magicNumber);
bw.Write(count);
bw.Write(dataSize);
Byte[] header = new Byte[headerSize];
Byte[] data = new Byte[dataSize];
fixed(Byte *entriesPtr = header)
fixed(Byte * dataPtr = data)
{
TXEntry *entries = (TXEntry *)entriesPtr;
SByte * str = (SByte *)dataPtr;
UInt32 offset = 0;
Int32 index = 0;
foreach (TXString entry in lines)
{
TXEntry *info = entries + index++;
info->Index = entry.Index;
info->Offset = checked ((UInt32)(offset + headerSize + sizeof(TXHeader)));
info->Size = entry.Data.Length + 1;
foreach (Char ch in entry.Data)
{
str[offset++] = (SByte)TXEncoding.ToText(ch);
}
str[offset++] = 0;
}
if (offset != dataSize)
{
throw new InvalidDataException("Something went wrong.");
}
}
output.Write(header, 0, header.Length);
output.Write(data, 0, data.Length);
}
}
