92 lines
2.8 KiB
Python
92 lines
2.8 KiB
Python
from __future__ import print_function, division, absolute_import
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from fontTools.misc.py23 import *
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from fontTools.misc import sstruct
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from fontTools.misc.textTools import safeEval, num2binary, binary2num
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from fontTools.misc.timeTools import timestampFromString, timestampToString, timestampNow
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from . import DefaultTable
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import warnings
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headFormat = """
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> # big endian
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tableVersion: 16.16F
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fontRevision: 16.16F
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checkSumAdjustment: I
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magicNumber: I
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flags: H
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unitsPerEm: H
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created: Q
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modified: Q
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xMin: h
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yMin: h
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xMax: h
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yMax: h
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macStyle: H
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lowestRecPPEM: H
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fontDirectionHint: h
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indexToLocFormat: h
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glyphDataFormat: h
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"""
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class table__h_e_a_d(DefaultTable.DefaultTable):
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dependencies = ['maxp', 'loca']
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def decompile(self, data, ttFont):
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dummy, rest = sstruct.unpack2(headFormat, data, self)
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if rest:
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# this is quite illegal, but there seem to be fonts out there that do this
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warnings.warn("extra bytes at the end of 'head' table")
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assert rest == "\0\0"
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# For timestamp fields, ignore the top four bytes. Some fonts have
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# bogus values there. Since till 2038 those bytes only can be zero,
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# ignore them.
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#
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# https://github.com/behdad/fonttools/issues/99#issuecomment-66776810
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for stamp in 'created', 'modified':
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value = getattr(self, stamp)
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if value > 0xFFFFFFFF:
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warnings.warn("'%s' timestamp out of range; ignoring top bytes" % stamp)
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value &= 0xFFFFFFFF
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setattr(self, stamp, value)
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if value < 0x7C259DC0: # January 1, 1970 00:00:00
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warnings.warn("'%s' timestamp seems very low; regarding as unix timestamp" % stamp)
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value += 0x7C259DC0
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setattr(self, stamp, value)
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def compile(self, ttFont):
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if ttFont.recalcTimestamp:
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self.modified = timestampNow()
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data = sstruct.pack(headFormat, self)
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return data
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def toXML(self, writer, ttFont):
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writer.comment("Most of this table will be recalculated by the compiler")
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writer.newline()
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formatstring, names, fixes = sstruct.getformat(headFormat)
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for name in names:
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value = getattr(self, name)
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if name in ("created", "modified"):
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value = timestampToString(value)
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if name in ("magicNumber", "checkSumAdjustment"):
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if value < 0:
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value = value + 0x100000000
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value = hex(value)
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if value[-1:] == "L":
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value = value[:-1]
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elif name in ("macStyle", "flags"):
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value = num2binary(value, 16)
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writer.simpletag(name, value=value)
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writer.newline()
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def fromXML(self, name, attrs, content, ttFont):
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value = attrs["value"]
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if name in ("created", "modified"):
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value = timestampFromString(value)
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elif name in ("macStyle", "flags"):
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value = binary2num(value)
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else:
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value = safeEval(value)
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setattr(self, name, value)
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