49 lines
2.1 KiB
HTML
49 lines
2.1 KiB
HTML
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<TITLE>Font-formats recognized by the Linux kbd package: CP and raw fonts</TITLE>
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<H2><A NAME="s4">4. CP and raw fonts</A></H2>
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<P>PSF is the Linux standard font format, but various old and very
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obsolete formats still exist.
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<P>CP font files are just fragments of CPI fonts, obtained by concatenating
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<CODE>CPEntryHeader</CODE> (28 bytes), <CODE>FontDataHeader</CODE> (6 bytes),
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and for each font <CODE>ScreenFontHeader</CODE> (6 bytes) and
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<CODE>ScreenFontData</CODE>, that is, the part of a CPI font describing
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one code page.
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<P>(History: the first <CODE>.cp</CODE> files used with Linux that I know of
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were <CODE>972.cp</CODE> and <CODE>880.cp</CODE> included in
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<CODE>codepage.tar.gz</CODE> by Joel M. Hoffman, dated June 14, 1992.
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Support for such files was added in <CODE>kbd-0.84</CODE>.)
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<P>Of the <CODE>CPEntryHeader</CODE>, the only meaningful field is <CODE>codepage</CODE>.
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Of the <CODE>FontDataHeader</CODE>, the only meaningful fields are
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<CODE>num_fonts</CODE> (1 or 3) and <CODE>size</CODE>, giving the size
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of the following <CODE>ScreenFontData</CODE>.
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A CP file containing three fonts of pointsizes 16, 14, 8 will have
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size 34+(6+16*256)+(6+14*256)+(6+8*256) = 9780 bytes, with the three
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fonts at offsets 40, 4142, 7732.
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A CP file containing one font of point size 16 will have size
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34+(6+16*256) = 4136 bytes, with the font at offset 40.
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<P>There are other sources of fonts, and binary files with a length
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that is a multiple of 256 or a multiple of 256 plus 40 are
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accepted as possible binary font data (perhaps with a 40-byte
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header) for fonts of size 256.
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<P>Binary font files of size 32768 are treated as binary font data
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for a 512-char font of height 32. Such files are written by
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the obsolete <CODE>restorefont -w</CODE>.
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