public static byte[] Encode(OJM.M30 m30)
{
using (var stream = new BufferStream())
{
stream.Write(OJM.M30.HEADER_SIGNATURE);
stream.Write(m30.Version);
stream.Write((int)m30.Encryption);
stream.Write(m30.SampleCount);
stream.Write(m30.SampleOffset);
stream.Write(m30.PayloadSize);
stream.Seek(m30.SampleOffset, SeekOrigin.Begin);
var samples = m30.Samples;
foreach (var sampleKeyPair in samples)
{
var sample = sampleKeyPair.Value;
byte[] payload = sample.Payload;
var info = EncodeToOGG(payload);
sample.Payload = payload;
sample.PCM = (int)(info.SampleCount * info.ChannelCount);
stream.Write(sample.Name.PadNull(32));
stream.Write(payload.Length);
stream.Write((short)sample.Type);
stream.Write(sample.Fix);
stream.Write(sample.Flag);
stream.Write((short)(sample.Type == OJM.M30.SampleType.BGM ? sample.Id - 1000 : sample.Id));
stream.Write(sample.Zero);
stream.Write(sample.PCM);
if (payload != null && payload.Length > 0)
{
if (m30.Encryption == OJM.M30.EncodingType.Nami)
{
byte[] nami = new byte[4] {
0x6E, 0x61, 0x6D, 0x69
};
for (int n = 0; n + 4 <= payload.Length; n += 4)
{
for (int x = 0; x < nami.Length; x++)
{
payload[n + x] ^= nami[x];
}
}
}
stream.Write(payload);
}
}
return(stream.ToArray());
}
}
public static OJM.M30 Decode(string filename)
{
if (!Check(filename))
{
throw new NotSupportedException("Invalid M30 OJM");
}
var m30 = new OJM.M30();
using (var stream = new BufferStream(filename))
{
stream.Seek(4, SeekOrigin.Begin);
m30.Version = stream.ReadInt32();
m30.Encryption = (OJM.M30.EncodingType)stream.ReadInt32();
int count = stream.ReadInt32();
int offset = stream.ReadInt32();
int payloadSize = stream.ReadInt32();
stream.Seek(m30.SampleOffset, SeekOrigin.Begin);
var samples = new Dictionary <int, OJM.M30.Sample>();
while (stream.HasRemaining)
{
string name = stream.ReadString(32);
int size = stream.ReadInt32();
var type = (OJM.M30.SampleType)stream.ReadInt16();
short fix = stream.ReadInt16(); // const 2
int musicFlag = stream.ReadInt32(); // const 1
short id = stream.ReadInt16();
short zero = stream.ReadInt16(); // const 0
int pcm = stream.ReadInt32();
var sample = new OJM.M30.Sample()
{
Id = id,
Type = type,
Name = name,
PCM = pcm
};
if (size > 0)
{
sample.Id += (short)(sample.Type == OJM.M30.SampleType.BGM ? 1000 : 0);
if (samples.ContainsKey(sample.Id))
{
throw new Exception("Sample duplication found.");
}
byte[] payload = stream.ReadBytes(size);
if (m30.Encryption == OJM.M30.EncodingType.Nami)
{
byte[] nami = new byte[4] {
0x6E, 0x61, 0x6D, 0x69
};
for (int n = 0; n + 4 <= payload.Length; n += 4)
{
for (int x = 0; x < nami.Length; x++)
{
payload[n + x] ^= nami[x];
}
}
}
sample.Payload = payload;
samples.Add(sample.Id, sample);
}
}
m30.Samples = samples;
return(m30);
}
}
