file/magic/Magdir/pc98

#------------------------------------------------------------------------------
# pc98:  file(1) magic for the MSX Home Computer
# v1.0
# Fabio R. Schmidlin <sd-snatcher@users.sourceforge.net>

# Maki-chan v1 Graphic format
# The image resolution should be X=(44.L - 40.L) and Y=(46.L - 42.L), but I couldn't find a way to do so
# http://www.jisyo.com/viewer/faq/maki_tech.htm
0	string/b		MAKI01 	Maki-chan v1.
>6	ubyte|0x20	x		\b%c image
>8	ubelong		>0x40404040	\b, system ID:
>>8	byte		x		%c
>>9	byte		x		\b%c
>>10	byte		x		\b%c
>>11	byte		x		\b%c
>44	ubeshort	x		\b, %dx
>46	ubeshort	x		\b%d
>38	ubeshort&2	0		\b, 16 paletted RGB colors
>38	ubeshort&2	2		\b, 8 fixed RGB colors
>38	ubeshort&1	1		\b, 2:1 dot aspect ratio

# Maki-chan v2 Graphic format
# http://www.jisyo.com/viewer/faq/mag_tech.htm
# https://mooncore.eu/bunny/txt/makichan.htm
# http://metanest.jp/mag/mag.xhtml
0	string/b		MAKI02\ \ 	Maki-chan v2 image,
>8	byte		x		system ID: %c
>9	byte		x		\b%c
>10	byte		x		\b%c
>11	byte		x		\b%c,
>13	search/0x200	\x1A
#Maki-chan video modes are a bit messy and seems to have been expanded over the years without too much planing:
#1) When offset1(ubeshort) !=0x0344:
# 1.1) And  offset3(ubyte).b7=0:
# - b0=pixel aspect ratio: 1=2:1   (note: this ignores that the machine's 1:1 pixel aspect ratio isn't really 1:1)
# - b1=number of colors: 0=16 colors, 1=8 colors
# - b2=Palette or fixed colors flag (called "analog" and "digital" in the doc): 0=Paletted, 1=Fixed colors encoded directly in the pixel data
# 1.2) And  offset3(ubyte).B7=1:
# - b0=256 paletted colors
# - b1=256 fixed colors using the MSX SCR8 palette
#2) When offset1(ubeshort) =0x0344:
# - 256x212 image with 19268 YJK colors. The usual resolution and color information fields from the file must be ignored
>>&1	ubeshort	0x0344		256x212, 19268 fixed YJK colors
>>&1	ubeshort	!0x0344
>>>&5	uleshort+1	x		%dx
>>>&7	uleshort+1	x		\b%d,
>>>&0	ubyte&0x86	0x00		16 paletted RGB colors
>>>&0	ubyte&0x86	0x02		8 paletted RGB colors
>>>&0	ubyte&0x86	0x04		16 fixed RGB colors
>>>&0	ubyte&0x86	0x06		8 fixed RGB colors
>>>&0	ubyte&0x81	0x80		256 paletted RGB colors
>>>&0	ubyte&0x81	0x81		256 fixed MSX-SCR8 colors
>>>&0	ubyte&0x01	1		\b, 2:1 dot aspect ratio

# XLD4 (Q4) picture
11	string/b	MAJYO		XLD4(Q4) picture

# Yanagisawa Pi picture
#0	string		Pi\x1A\0	Yanagisawa Pi picture
#>3	search/0x200	\x04
0	string		Pi
>2	search/0x200	\x1A
>>&0	ubyte		0
>>>&3	ubyte		4		Yanagisawa Pi 16 color picture,
>>>&4	byte		x		system ID: %c
>>>&5	byte		x		\b%c
>>>&6	byte		x		\b%c
>>>&7	byte		x		\b%c,
>>>&10	ubeshort	x		%dx
>>>&12	ubeshort	x		\b%d
>>>&3	ubyte		8		Yanagisawa Pi 256 color picture
>>>&4	byte		x		system ID: %c
>>>&5	byte		x		\b%c
>>>&6	byte		x		\b%c
>>>&7	byte		x		\b%c,
>>>&10	ubeshort	x		%dx
>>>&12	ubeshort	x		\b%d