#------------------------------------------------------------------------------
-# $File: fonts,v 1.42 2019/07/06 19:31:36 christos Exp $
+# $File: fonts,v 1.43 2019/07/16 11:11:31 christos Exp $
# fonts: file(1) magic for font data
#
0 search/1 FONT ASCII vfont text
#
# usual case with lightening mask and skewing mask 5555h~UU
#62 ulelong 0x55555555
-#>0 use gdos-font
+# skip cl8m8ocofedso.testfile by looking for face size lower/equal 72
+#>2 uleshort <73
+#>>0 use gdos-font
# BOX18.GFT COWBOY30.GFT ROYALK30.GFT
#62 ulelong 0
# skip ISO 9660 CD-ROM ./filesystem by looking for low positive face size
#>2 uleshort >2
-# skip DOS 2.0 backup id file ./msdos by looking for face size lower/equal 48
-#>>2 uleshort <49
-# skip MS Windows ICO ./msdos by looking for valid face name
-#>>>4 ubeshort >0x1F00
-# skip DOS executable BACKM212.COM by looking for horizontal offset table after header
-#>>>>68 ulelong >87 OFFSET_OK
-#>>>>0 use gdos-font
+# skip DOS 2.0 backup id file ./msdos by looking for face size lower/equal 72
+#>>2 uleshort <73
+# skip MS oem.hlp, some Windows ICO ./msdos by looking for valid long name like WYE
+#>>>4 ulelong >0x001F1f1F
+# skip Microsoft WinWord 2.0 ./msdos by looking for positive offset to font data
+#>>>>76 ulelong >83
+#>>>>>0 use gdos-font
0 name gdos-font
>0 uleshort x GEM GDOS font
!:mime application/x-font-gdos
# also .eps found like AA070GEP.EPS AI360GEP.EPS
!:ext fnt/gtf
-# font name like University Bold
+# font name like Big&Tall, Celtic #s, Courier, University Bold, WYE
>4 string x %.32s
-# face size in points 3-48
+# face size in points 3-72 SLSS03CG.FNT H1CELT72.FNT
>2 uleshort x %u
# face ID (must be unique)
>0 uleshort x \b, ID 0x%4.4x
-# lowest character index in face (usually 32 for disk-loaded fonts).
-#>36 uleshort x \b, low character index %u
-# width of the widest character
+# lowest character index in face (4 but usually 32 for disk-loaded fonts)
+#>36 uleshort !32 \b, unusual character index %u
+# width of the widest character like 0 8 10 12 16 24 32
#>50 uleshort x \b, %u char width
-# width of the widest character cell
+# width of the widest character cell like 8 11 12 14 15 16 33 67
#>52 uleshort x \b, %u cell width
-# thickening size
+# thickening size in pixel like 0 1 2 3 4 5 6 7 8
#>58 uleshort x \b, %u thick
# lightening mask to eliminate pixels, usually 5555h
>62 uleshort !0x5555 \b, lightening mask 0x%x
# skewing mask to determine when to perform additional rotation when skewing, usually 5555h
>64 uleshort !0x5555 \b, skewing mask 0x%x
-# offset to horizontal offset table 58h~88 5eh
-#>68 ulelong >88 \b, 0x%x horizontal table offset
-# offset character offset table
+# offset to optional horizontal offset table 0 58h~88 5eh 252h
+#>68 ulelong x \b, 0x%x horizontal table offset
+# offset of character offset table 54h for many *.GFT 55h 58h 5Eh 120h 1D4h 202h 220h
#>72 ulelong x \b, 0x%x coffset
-# offset to font data
-#>72 ulelong x \b, 0x%x foffset
-# form width in bytes
+# offset to font data like 116h 118h 158 20Ah 20Eh
+>76 ulelong x \b, 0x%x foffset
+# form width in bytes like 58 67 156 190 227 317 345
#>80 uleshort x \b, %u fwidth
-# pointer to the next font, set by GDOS after loading
+# form height in bytes like 4 8 11 17 26 56 70 90 120 146 150
+#>82 uleshort x \b, %u fheight
+# pointer to the next font like 0 10000h 20000h 30000h 40000h 60000h 80000h E0000h D0000h
#>84 ulelong x \b, 0x%x noffset
# downloadable fonts for browser (prints type) anthon@mnt.org
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