FF8/WorldMap charaone

by Maki file is different than field [ONE] Basically you have to read the whole file step-by-step as there are minimum pointers and no sizes at all. Therefore just to read one character on world map you have to actually read all content of chara.one. You have to read whole TIM textures first, calculate the global size of TIM texture and advance further. Textures are always 0x10000000 08000000. My approach is to read uint64 and check if it contains TIM header. If not, then geometry section (see Chara). I named the bones/animation section as "section 12" because game engine calls function for chara.one files with 0x11 for reading the header data (chara) and then again with argument 0x12 having pointer to data as in Wiki in EAX. It's like:

uint myPointer = charaOneFunction(pointer_to_Chara_section, 0x11...);
charaOneFunction(myPointer, 0x12...);

Header

Offset	Length	Description
0x00	uint	EOF
0x04	(TIM_height * (TIM_width * 4) ) / 2 + 64	TIM texture
*(this) != x 10 00 00 00 08 00 00 00	Varies	Chara

Chara

Always 64 bytes length!

UPDATE: Looks like it's 1:1 to MCH: http://wiki.ffrtt.ru/index.php/FF8/FileFormat_MCH#Model-Data

Offset	Length	Description
0x00	uint	BoneSectionLength
0x04	uint	unknown struct size. Multiply by 8
0x08	uint	unknown size
0x0C	uint	count (used as controller local var)
0x10	uint	unknown
0x14	uint	unknown
0x18	uint	unknown
0x1C	uint	unknown
0x20	uint	unknown
0x24	uint	unknown
0x28	uint	unknown
0x2C	uint	unknown
0x30	uint	unknown
0x24	uint	unknown
0x38	uint	Animation section pointer (0x12)
0x3C	uint	unknown
0x40	BoneSectionLength<<6	BoneSection

Animation section (arg4 == 0x12)

Offset	Length	Description
0x00	ushort	countOfAnimations
0x02 + ( entry.Length != 0 ? sizeof(entry[i-1] : 0)	sizeof(this)	Animation

Animation:

Offset	Length	Description
0x00	ushort	count of animation keypoints
0x02	ushort	count of bones translation frames
0x04 + (entityID * (countOfBoneRot * 6) + 6)	6 + (countOfBoneRotations*6)	AnimationKeypoint

AnimationKeypoint:

Offset	Length	Description
0x00	short	origin X offset
0x02	short	origin Z offset
0x04	short	origin Y (up) offset
0x06 + (boneID*6)	short	Bone[boneID].RotX
0x08 + (boneID*6)	short	Bone[boneID].RotZ
0x0A + (boneID*6)	short	Bone[boneID].RotY

Case study: First character is Squall in chara.one. Two TIM 8BPP textures. Squall has 8 animations. First animation has one keypoint with 16 bone translations. When moving it plays 2nd animation and has 0x14 keypoints which every have 0x10 bone translations. You can edit origin XYZ offsets for every frame. Due to they way the file is constructed it's not so easy to actually test play other animations.

source

Example C# source of file parsing as in OpenVIII (commit from 16/02/1019): https://github.com/MaKiPL/OpenVIII/blob/db46297fbc7961852e89427927df2e40623266a5/FF8/module_world_debug.cs#L202

private static void ReadCharaOne(byte[] charaOneB)
       {
           using (MemoryStream ms = new MemoryStream(charaOneB))
           using (BinaryReader br = new BinaryReader(ms))
           {
               uint eof = br.ReadUInt32();
               TIM2 tim;
               while (ms.CanRead)
                   if (BitConverter.ToUInt16(charaOneB, (int)ms.Position) == 0)
                       ms.Seek(2, SeekOrigin.Current);
                   else if (br.ReadUInt64() == 0x0000000800000010)
                   {
                       ms.Seek(-8, SeekOrigin.Current);
                       tim = new TIM2(charaOneB, (uint)ms.Position);
                       ms.Seek(tim.GetHeight * tim.GetWidth / 2 + 64, SeekOrigin.Current); //i.e. 64*20=1280/2=640 + 64= 704 + eof
                       if (charaOneTextures == null)
                           charaOneTextures = new List<Texture2D[]>();
                       charaOneTextures.Add(new Texture2D[1] { new Texture2D(Memory.graphics.GraphicsDevice, tim.GetWidth, tim.GetHeight, false, SurfaceFormat.Color) });
                       charaOneTextures.Last()[0].SetData(tim.CreateImageBuffer(tim.GetClutColors(0), true));
                   }
                   else //is geometry structure
                   {
                       ms.Seek(-8, SeekOrigin.Current);
                       uint esi10h = BitConverter.ToUInt32(charaOneB, (int)ms.Position + 0x10);
                       uint esi14h = BitConverter.ToUInt32(charaOneB, (int)ms.Position + 0x14);
                       uint u45 = BitConverter.ToUInt32(charaOneB, (int)ms.Position + 56); //+2?
                       uint v29 = BitConverter.ToUInt32(charaOneB, (int)ms.Position) << 6; //bone section?
                       uint d250516c = BitConverter.ToUInt32(charaOneB, (int)ms.Position + 4) * 8; //unk?
                       uint v25 = BitConverter.ToUInt32(charaOneB, (int)ms.Position + 8); //unk size?
                       ms.Seek(u45, SeekOrigin.Current);
                       if (ms.Position > ms.Length)
                           break;
                       ushort countIs = br.ReadUInt16();
                       ushort cEntries = 0;
                       while (countIs != 0/*(cEntries = br.ReadUInt16()) != 0*/)
                       {
                           cEntries = br.ReadUInt16();
                           ushort cBones = br.ReadUInt16();
                           while (cEntries != 0)
                           {
                               Bone testBone = new Bone() { X = br.ReadInt16(), Y = br.ReadInt16(), Z = br.ReadInt16() };
                               Vector3[] myVec = new Vector3[cBones];
                               for (int i = 0; i < cBones; i++)
                                   myVec[i] = new Vector3() { X = br.ReadInt16(), Y = br.ReadUInt16(), Z = br.ReadUInt16() };
                               cEntries--;
                           }
                           countIs--;
                       }
                   }
               return;
           }
}