public IReadOnlyCollection <String> ReadLines()
{
unsafe
{
Int32 headerOffset = Positive(_br.ReadInt32());
Int32 headerCount = Positive(_br.ReadInt32());
Int32 headerSize = checked (headerCount * sizeof(GVHeaderEntry));
Int32 contentOffset = Positive(_br.ReadInt32());
Int32 contentSize = Positive(_br.ReadInt32());
_stream.SetPosition(headerOffset);
Byte[] header = _stream.ReadBytes(headerSize);
_stream.SetPosition(contentOffset);
Byte[] content = _stream.ReadBytes(contentSize);
String[] result = new String[headerCount];
fixed(Byte *headerBytes = header)
fixed(Byte * contentBytes = content)
{
GVHeaderEntry *entriesPtr = (GVHeaderEntry *)headerBytes;
SByte * contentPtr = (SByte *)contentBytes;
for (Int32 i = 0; i < headerCount; i++)
{
if (IsEmpty(entriesPtr, i))
{
result[i] = $"{i:D4}|";
continue;
}
GVHeaderEntry entry = entriesPtr[i];
CheckEntry(i, ref entry, contentPtr);
Int32 offset = InRange(entry.Offset, minValue: 0, maxValue: contentSize - 1);
Int32 size = InRange(entry.Size, minValue: 2, maxValue: contentSize - offset); // \0 terminated strings
UInt32 value = entry.Value;
UInt32 mask = entry.Mask;
String name = new String(contentPtr, offset, size - 1, Encoding.ASCII);
if ((value & mask) != value)
{
throw new InvalidDataException($"Value 0x[{value:X8}] of the variable [{i:D4}:{name}] is out of mask [{mask:X8}].");
}
FormatTypeAndValue(mask, value, out var formattedType, out var formattedValue);
result[i] = $"{i:D4}| {formattedType} {name} = {formattedValue}";
}
}
return(result);
}
}
private static unsafe Boolean IsEmpty(GVHeaderEntry *entriesPtr, Int32 i)
{
Int64 *raw = (Int64 *)(entriesPtr + i);
return(raw[0] == 0 && raw[1] == 0);
}