/usr/share/common-lisp/source/zpb-ttf/head.lisp is in cl-zpb-ttf 0.7-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 | ;;; Copyright (c) 2006 Zachary Beane, All Rights Reserved
;;;
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;;
;;; * Redistributions of source code must retain the above copyright
;;; notice, this list of conditions and the following disclaimer.
;;;
;;; * Redistributions in binary form must reproduce the above
;;; copyright notice, this list of conditions and the following
;;; disclaimer in the documentation and/or other materials
;;; provided with the distribution.
;;;
;;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR 'AS IS' AND ANY EXPRESSED
;;; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
;;; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
;;; ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
;;; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
;;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
;;; GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
;;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
;;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;;
;;; Loading data from the "head" table.
;;;
;;; http://www.microsoft.com/OpenType/OTSpec/head.htm
;;; http://developer.apple.com/fonts/TTRefMan/RM06/Chap6head.html
;;;
;;; head.lisp,v 1.5 2006/02/18 23:13:43 xach Exp
(in-package #:zpb-ttf)
(defmethod load-head-info ((font-loader font-loader))
(seek-to-table "head" font-loader)
(with-slots (input-stream units/em bounding-box loca-offset-format)
font-loader
(flet ((skip-bytes (count)
(file-position input-stream (+ count
(file-position input-stream)))))
(let ((version (read-uint32 input-stream)))
(check-version "\"head\" table" version #x00010000))
;; skip fontRevsion and checkSumAdjustment (both uint32)
(skip-bytes 8)
;; check the magicNumber
(let ((magic-number (read-uint32 input-stream)))
(when (/= magic-number #x5F0F3CF5)
(error 'bad-magic
:location "\"head\" table"
:expected-values (list #x5F0F3CF5)
:actual-value magic-number)))
;; skip flags
(skip-bytes 2)
(setf units/em (read-uint16 input-stream))
;; skip created and modified dates
(skip-bytes 16)
(setf bounding-box (vector (read-int16 input-stream)
(read-int16 input-stream)
(read-int16 input-stream)
(read-int16 input-stream)))
;; skip macStyle, lowestRecPPEM, fontDirectionHint
(skip-bytes 6)
;; set the loca-offset-format
(if (zerop (read-int16 input-stream))
(setf loca-offset-format :short)
(setf loca-offset-format :long)))))
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