public static SpriteSetHeader ReadFromFile(string filepath)
{
SpriteSetHeader header = new SpriteSetHeader();
using (FileStream stream = new FileStream(filepath, FileMode.Open))
{
using (BinaryReader reader = new BinaryReader(stream, Encoding.Latin1))
{
header.Version = reader.ReadInt16();
header.Compression = CompressionType.Unknown;
byte compressionType = reader.ReadByte();
if (Enum.IsDefined(typeof(CompressionType), (int)compressionType))
{
header.Compression = (CompressionType)compressionType;
}
header.FileID = reader.ReadUInt32();
header.SpritesCount = reader.ReadUInt16();
if (header.Version < 5)
{
header.Palette = AGSGraphics.ReadPalette(reader);
}
}
}
return(header);
}
private static SpriteSetHeader ReadSpriteSetHeader(BinaryReader reader)
{
int version = reader.ReadInt16();
// FIXME(adm244): should probably use ReadFixedString instead; there are many cases like this
string signature = reader.ReadFixedCString(SpriteSetSignature.Length);
//Debug.Assert(signature == SpriteSetSignature);
if (signature != SpriteSetSignature)
{
throw new InvalidDataException("Sprite set file signature mismatch!");
}
if (version < 4 || version > 11)
{
throw new NotSupportedException(
$"Sprite set version is not supported.\n\nGot: {version}\nMin supported: {4}\nMax supported: {11}");
}
CompressionType compression = SpriteSetHeader.DefaultCompression;
UInt32 fileID = SpriteSetHeader.DefaultFileID;
if (version == 4)
{
compression = CompressionType.Uncompressed;
}
else if (version == 5)
{
compression = CompressionType.RLE;
}
else if (version >= 6)
{
compression = CompressionType.Unknown;
byte compressionType = reader.ReadByte();
if (Enum.IsDefined(typeof(CompressionType), (int)compressionType))
{
compression = (CompressionType)compressionType;
}
fileID = reader.ReadUInt32();
}
// TODO(adm244): for correct results we should get palette from a DTA file instead
Palette palette = SpriteSetHeader.DefaultPalette;
if (version < 5)
{
palette = AGSGraphics.ReadPalette(reader);
// NOTE(adm244): first 17 colors are locked and cannot be changed in pre 6
// but for some reason palette in sprite set file differs from game data (2.72)
// Here we try to restore what we can, but it's not enought to be fully correct
// AGS. When everything's a stress.
for (int i = 0; i < 17; ++i)
{
palette.Entries[i] = SpriteSetHeader.DefaultPalette[i];
}
}
int spritesCount;
if (version < 11)
{
spritesCount = reader.ReadUInt16();
}
else
{
spritesCount = reader.ReadInt32();
}
return(new SpriteSetHeader(version, compression, fileID, spritesCount, palette));
}
