There are also font identifier sites out there, such as WhatTheFont and Identifont.

… Hey … but I know the file format! So I whipped up this script. It’s a stand-alone, I leave it to the writer of the original to integrate it.

myFile = File(app.selection[0].appliedFont.location);
myFile.open(“r”);
myFile.encoding = “binary”; // Important!

// Read TTF/OTF header
hdr = getUlong(myFile);
if (hdr != 65536 // Microsoft Truetype
&& hdr != 1330926671) // Adobe OTF ‘OTTO’
{
myFile.close();
alert (“Not a font type I can read…”);
exit(0);
}
numTable = getUshort (myFile);

/* Already read:
ul version
us numTable
Skip over
us searchRange
us entrySelector
us rangeShift
to get to start of tables:
*/
myFile.seek (12);

/* Find ‘maxp’ — maximum profile */
/* Each table entry is
ul tag
ul checksum
ul offset
ul length
*/
for (var t=0; t<numTable; t++)
{
tableEntry = myFile.read(16);
if (tableEntry.substr(0,4) == ‘maxp’) break;
}
if (tableEntry.substr(0,4) != ‘maxp’)
{
myFile.close();
alert (“No ‘maxp’ entry found–yuck”);
exit(0);
}

offset = (((((tableEntry.charCodeAt(8 ) << 8 ) +
tableEntry.charCodeAt(9)) << 8 ) +
tableEntry.charCodeAt(10)) << 8 ) +
tableEntry.charCodeAt(11);

myFile.seek (offset);

// Should be 0001.0000 but is sometimes different…
// Let’s ignore that, shall we.
version = getUlong (myFile);
NumberOfGlyphs = getUshort (myFile);
alert (“NumberOfGlyphs is “+NumberOfGlyphs);

myFile.close();

function getUshort (aFile)
{
var result = aFile.read(2);
return (result.charCodeAt(0)<<8 ) +
result.charCodeAt(1);
}

function getUlong (aFile)
{
var result = aFile.read(4);
return ((((result.charCodeAt(0)<<8 ) +
result.charCodeAt(1))<<8 ) +
result.charCodeAt(2)<<8 ) +
result.charCodeAt(3);
}

1. Open Type > Glyphs panel
2. Choose the font in question from the bottom of the Glyph panel
3. Choose Sort Glyphs > By CID/GID from the Glyphs panel menu
4. Scroll to bottom of Glyphs panel
5. Select final glyph and look at GID number in its tool tip. That’s the total (highest) GID in the font, I believe.

I tried it with Adobe Caslon Pro Regular and the final GID was 800; when I switched to Century Gothic Regular, the final one was 244.

Thanks, Phyllis