public override ImageData Read(IBinaryStream file, ImageMetaData info)
{
var reader = new CgfDecoder(file, (CgfMetaData)info);
var pixels = reader.Unpack();
return(ImageData.Create(info, reader.Format, null, pixels));
}
public override Stream OpenEntry(ArcFile arc, Entry entry)
{
if (!entry.Name.HasExtension(".snr") ||
!arc.File.View.AsciiEqual(entry.Offset, "SNR\x1A"))
{
return(base.OpenEntry(arc, entry));
}
try
{
var data = arc.File.View.ReadBytes(entry.Offset + 12, entry.Size - 12);
DecryptSnr(data);
CgfDecoder.Decrypt(data, data.Length);
// uint checksum = LittleEndian.ToUInt32 (data, 0);
// uint crc = Crc32Normal.Compute (data, 4, data.Length-4);
var input = new MemoryStream(data, 4, data.Length - 4);
return(new ZLibStream(input, CompressionMode.Decompress));
}
catch
{
return(base.OpenEntry(arc, entry));
}
}
public override SoundInput TryOpen(IBinaryStream file)
{
var header = file.ReadHeader(0x23);
int bits1_length = header.ToInt32(0x13);
int bits2_length = header.ToInt32(0x17);
var data = file.ReadBytes(bits1_length + bits2_length);
CgfDecoder.Decrypt(data, bits1_length);
int unpacked_length = header.ToInt32(5);
uint sample_rate = header.ToUInt32(0xD);
int sample_count = unpacked_length >> 1;
var bits1 = new byte[(sample_count + 7) >> 3];
var bits2 = new byte[sample_count >> 1];
using (var mem = new MemoryStream(data, 4, bits1_length - 4))
using (var input = new ZLibStream(mem, CompressionMode.Decompress))
input.Read(bits1, 0, bits1.Length);
using (var mem = new MemoryStream(data, bits1_length + 4, bits2_length - 4))
using (var input = new ZLibStream(mem, CompressionMode.Decompress))
input.Read(bits2, 0, bits2.Length);
short init = header.ToInt16(0x11);
var decoded = new short[sample_count];
DecodeAdp(bits2, decoded, sample_count, init);
var output = new byte[unpacked_length];
byte bit = 0x80;
int src = 0;
int dst = 0;
for (int i = 0; i < decoded.Length; ++i)
{
short sample = Math.Max(decoded[i], (short)0);
if ((bit & bits1[src]) != 0)
{
sample = (short)-sample;
}
LittleEndian.Pack(sample, output, dst);
dst += 2;
bit >>= 1;
if (0 == bit)
{
++src;
bit = 0x80;
}
}
var format = new WaveFormat {
FormatTag = 1,
Channels = 1,
SamplesPerSecond = sample_rate,
BlockAlign = 2,
BitsPerSample = 16,
};
format.SetBPS();
var pcm = new MemoryStream(output);
return(new RawPcmInput(pcm, format));
}
