/// <summary>
/// Parse a flipnote's raw bytes
/// </summary>
/// <param name="bytes">Raw Flipnote Bytes</param>
public void Parse(byte[] bytes)
{
var br = new BinaryReader(new MemoryStream(bytes));
if (!br.ReadChars(4).SequenceEqual(FileMagic))
{
throw new Exception("Unexpected file format");
}
AnimationDataSize = br.ReadUInt32();
SoundDataSize = br.ReadUInt32();
FrameCount = (ushort)(br.ReadUInt16() + 1);
FormatVersion = br.ReadUInt16();
IsLocked = br.ReadUInt16() != 0;
ThumbnailFrameIndex = br.ReadUInt16();
string rootname = br.ReadWChars(11);
string parentname = br.ReadWChars(11);
string currentname = br.ReadWChars(11);
ulong parentid = br.ReadUInt64();
ulong currentid = br.ReadUInt64();
ParentFilename = br.ReadPPMFilename();
CurrentFilename = br.ReadPPMFilename();
ulong rootid = br.ReadUInt64();
RootAuthor = new PPMAuthor(rootname, rootid);
ParentAuthor = new PPMAuthor(parentname, parentid);
CurrentAuthor = new PPMAuthor(currentname, currentid);
RootFileFragment = br.ReadPPMFileFragment();
Timestamp = br.ReadPPMTimestamp();
br.ReadUInt16(); // 0x9E
Thumbnail = br.ReadPPMThumbnail();
FrameOffsetTableSize = br.ReadUInt16();
br.ReadUInt32(); //0x6A2 - always 0
AnimationFlags = br.ReadUInt16();
var oCnt = FrameOffsetTableSize / 4.0 - 1;
_animationOffset = new uint[(int)oCnt + 1];
Frames = new PPMLib.PPMFrame[FrameCount];
for (var x = 0; x <= oCnt; x++)
{
_animationOffset[x] = br.ReadUInt32();
}
long framePos0 = br.BaseStream.Position;
var offset = framePos0; //&H6A8 + FrameOffsetTableSize
for (var x = 0; x <= oCnt; x++)
{
if (offset + _animationOffset[x] == 4288480943)
{
throw new Exception("Data corrupted (possible memory pit?)");
}
br.BaseStream.Seek(offset + _animationOffset[x], SeekOrigin.Begin);
Frames[x] = br.ReadPPMFrame();
Frames[x].AnimationIndex = Array.IndexOf(_animationOffset, _animationOffset[x]);
if (x > 0)
{
Frames[x].Overwrite(Frames[x - 1]);
}
}
// Read Sound Data
if (SoundDataSize == 0)
{
return;
}
offset = 0x6A0 + AnimationDataSize;
br.BaseStream.Seek(offset, SeekOrigin.Begin);
SoundEffectFlags = new byte[Frames.Length];
Audio = new PPMAudio();
for (int i = 0; i < Frames.Length; i++)
{
SoundEffectFlags[i] = br.ReadByte();
}
offset += Frames.Length;
// make the next offset dividable by 4
br.ReadBytes((int)((4 - offset % 4) % 4));
Audio.SoundData = new _SoundData();
Audio.SoundHeader = new _SoundHeader();
Audio.SoundHeader.BGMTrackSize = br.ReadUInt32();
Audio.SoundHeader.SE1TrackSize = br.ReadUInt32();
Audio.SoundHeader.SE2TrackSize = br.ReadUInt32();
Audio.SoundHeader.SE3TrackSize = br.ReadUInt32();
Audio.SoundHeader.CurrentFramespeed = (byte)(8 - br.ReadByte());
Audio.SoundHeader.RecordingBGMFramespeed = (byte)(8 - br.ReadByte());
//
Framerate = PPM_FRAMERATES[Audio.SoundHeader.CurrentFramespeed];
BGMRate = PPM_FRAMERATES[Audio.SoundHeader.RecordingBGMFramespeed];
br.ReadBytes(14);
Audio.SoundData.RawBGM = br.ReadBytes((int)Audio.SoundHeader.BGMTrackSize);
Audio.SoundData.RawSE1 = br.ReadBytes((int)Audio.SoundHeader.SE1TrackSize);
Audio.SoundData.RawSE2 = br.ReadBytes((int)Audio.SoundHeader.SE2TrackSize);
Audio.SoundData.RawSE3 = br.ReadBytes((int)Audio.SoundHeader.SE3TrackSize);
// Read Signature (Will implement later)
if (br.BaseStream.Position == br.BaseStream.Length)
{
// file is RSA unsigned -> do something...
}
else
{
// Next 0x80 bytes = RSA-1024 SHA-1 signature
Signature = br.ReadBytes(0x80);
var padding = br.ReadBytes(0x10);
// Next 0x10 bytes are filled with 0
}
}
public static PPMFile Create(PPMAuthor author, List <PPMFrame> frames, byte[] audio, bool ignoreMetadata = false)
{
var file = new PPMFile();
file.FrameCount = (ushort)(frames.Count - 1);
file.FormatVersion = 0x24;
if (!ignoreMetadata)
{
file.RootAuthor = author;
file.ParentAuthor = author;
file.CurrentAuthor = author;
string mac6 = string.Join("", BitConverter.GetBytes(author.Id).Take(3).Reverse().Select(t => t.ToString("X2")));
var asm = Assembly.GetEntryAssembly().GetName().Version;
var dt = DateTime.UtcNow;
var fnVM = ((byte)asm.Major).ToString("X2");
var fnVm = ((byte)asm.Minor).ToString("X2");
var fnYY = (byte)(dt.Year - 2009);
var fnMD = dt.Month * 32 + dt.Day;
var fnTi = (((dt.Hour * 3600 + dt.Minute * 60 + dt.Second) % 4096) >> 1) + (fnMD > 255 ? 1 : 0);
fnMD = (byte)fnMD;
var fnYMD = (fnYY << 9) + fnMD;
var H6_9 = fnYMD.ToString("X4");
var H89 = ((byte)fnMD).ToString("X2");
var HABC = fnTi.ToString("X3");
string _13str = $"80{fnVM}{fnVm}{H6_9}{HABC}";
string nEdited = 0.ToString().PadLeft(3, '0');
var filename = $"{mac6}_{_13str}_{nEdited}.ppm";
var rawfn = new byte[18];
for (int i = 0; i < 3; i++)
{
rawfn[i] = byte.Parse("" + mac6[2 * i] + mac6[2 * i + 1], System.Globalization.NumberStyles.HexNumber);
}
for (int i = 3; i < 16; i++)
{
rawfn[i] = (byte)_13str[i - 3];
}
rawfn[16] = rawfn[17] = 0;
file.ParentFilename = new PPMFilename(rawfn);
file.CurrentFilename = new PPMFilename(rawfn);
var ByteRootFileFragment = new byte[8];
for (int i = 0; i < 3; i++)
{
ByteRootFileFragment[i] =
byte.Parse("" + mac6[2 * i] + mac6[2 * i + 1], System.Globalization.NumberStyles.HexNumber);
}
for (int i = 3; i < 8; i++)
{
ByteRootFileFragment[i] =
(byte)((byte.Parse("" + _13str[2 * (i - 3)], System.Globalization.NumberStyles.HexNumber) << 4)
+ byte.Parse("" + _13str[2 * (i - 3) + 1], System.Globalization.NumberStyles.HexNumber));
}
file.RootFileFragment = new PPMFileFragment(ByteRootFileFragment);
file.Timestamp = new PPMTimestamp((uint)((dt - new DateTime(2000, 1, 1, 0, 0, 0)).TotalSeconds));
file.Thumbnail = new PPMThumbnail(new byte[0x600]);
file.ThumbnailFrameIndex = 0;
}
// write the audio data
uint animDataSize = (uint)(8 + 4 * frames.Count);
file.AnimationFlags = 0x43;
file.FrameOffsetTableSize = (ushort)(4 * frames.Count);
file.Frames = new PPMFrame[frames.Count];
//SoundEffectFlags = new byte[frames.Count];
for (int i = 0; i < frames.Count; i++)
{
file.Frames[i] = frames[i];
animDataSize += (uint)file.Frames[i].ToByteArray().Length;
}
while ((animDataSize & 0x3) != 0)
{
animDataSize++;
}
file.AnimationDataSize = animDataSize;
file.Audio = new PPMAudio();
file.Audio.SoundData.RawBGM = audio;
file.Audio.SoundHeader.BGMTrackSize = (uint)file.Audio.SoundData.RawBGM.Length;
file.Audio.SoundHeader.SE1TrackSize = 0;
file.Audio.SoundHeader.SE2TrackSize = 0;
file.Audio.SoundHeader.SE2TrackSize = 0;
file.SoundDataSize = (uint)file.Audio.SoundData.RawBGM.Length;
file.Audio.SoundHeader.CurrentFramespeed = 0;
file.Audio.SoundHeader.RecordingBGMFramespeed = 0;
return(file);
}
