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<H2><A NAME="s4">4. CP and raw fonts</A></H2>

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