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- from fontTools.misc import sstruct
- from fontTools.misc.textTools import bytechr, byteord, tobytes, tostr, safeEval
- from . import DefaultTable
- SINGFormat = """
- > # big endian
- tableVersionMajor: H
- tableVersionMinor: H
- glyphletVersion: H
- permissions: h
- mainGID: H
- unitsPerEm: H
- vertAdvance: h
- vertOrigin: h
- uniqueName: 28s
- METAMD5: 16s
- nameLength: 1s
- """
- # baseGlyphName is a byte string which follows the record above.
- class table_S_I_N_G_(DefaultTable.DefaultTable):
- dependencies = []
- def decompile(self, data, ttFont):
- dummy, rest = sstruct.unpack2(SINGFormat, data, self)
- self.uniqueName = self.decompileUniqueName(self.uniqueName)
- self.nameLength = byteord(self.nameLength)
- assert len(rest) == self.nameLength
- self.baseGlyphName = tostr(rest)
- rawMETAMD5 = self.METAMD5
- self.METAMD5 = "[" + hex(byteord(self.METAMD5[0]))
- for char in rawMETAMD5[1:]:
- self.METAMD5 = self.METAMD5 + ", " + hex(byteord(char))
- self.METAMD5 = self.METAMD5 + "]"
- def decompileUniqueName(self, data):
- name = ""
- for char in data:
- val = byteord(char)
- if val == 0:
- break
- if (val > 31) or (val < 128):
- name += chr(val)
- else:
- octString = oct(val)
- if len(octString) > 3:
- octString = octString[1:] # chop off that leading zero.
- elif len(octString) < 3:
- octString.zfill(3)
- name += "\\" + octString
- return name
- def compile(self, ttFont):
- d = self.__dict__.copy()
- d["nameLength"] = bytechr(len(self.baseGlyphName))
- d["uniqueName"] = self.compilecompileUniqueName(self.uniqueName, 28)
- METAMD5List = eval(self.METAMD5)
- d["METAMD5"] = b""
- for val in METAMD5List:
- d["METAMD5"] += bytechr(val)
- assert len(d["METAMD5"]) == 16, "Failed to pack 16 byte MD5 hash in SING table"
- data = sstruct.pack(SINGFormat, d)
- data = data + tobytes(self.baseGlyphName)
- return data
- def compilecompileUniqueName(self, name, length):
- nameLen = len(name)
- if length <= nameLen:
- name = name[: length - 1] + "\000"
- else:
- name += (nameLen - length) * "\000"
- return name
- def toXML(self, writer, ttFont):
- writer.comment("Most of this table will be recalculated by the compiler")
- writer.newline()
- formatstring, names, fixes = sstruct.getformat(SINGFormat)
- for name in names:
- value = getattr(self, name)
- writer.simpletag(name, value=value)
- writer.newline()
- writer.simpletag("baseGlyphName", value=self.baseGlyphName)
- writer.newline()
- def fromXML(self, name, attrs, content, ttFont):
- value = attrs["value"]
- if name in ["uniqueName", "METAMD5", "baseGlyphName"]:
- setattr(self, name, value)
- else:
- setattr(self, name, safeEval(value))
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