263 lines
8.7 KiB
Python
263 lines
8.7 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
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from fontTools.misc.encodingTools import getEncoding
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from . import DefaultTable
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import struct
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nameRecordFormat = """
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> # big endian
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platformID: H
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platEncID: H
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langID: H
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nameID: H
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length: H
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offset: H
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"""
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nameRecordSize = sstruct.calcsize(nameRecordFormat)
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class table__n_a_m_e(DefaultTable.DefaultTable):
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def decompile(self, data, ttFont):
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format, n, stringOffset = struct.unpack(">HHH", data[:6])
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expectedStringOffset = 6 + n * nameRecordSize
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if stringOffset != expectedStringOffset:
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# XXX we need a warn function
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print("Warning: 'name' table stringOffset incorrect. Expected: %s; Actual: %s" % (expectedStringOffset, stringOffset))
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stringData = data[stringOffset:]
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data = data[6:]
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self.names = []
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for i in range(n):
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if len(data) < 12:
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# compensate for buggy font
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break
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name, data = sstruct.unpack2(nameRecordFormat, data, NameRecord())
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name.string = stringData[name.offset:name.offset+name.length]
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assert len(name.string) == name.length
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#if (name.platEncID, name.platformID) in ((0, 0), (1, 3)):
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# if len(name.string) % 2:
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# print "2-byte string doesn't have even length!"
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# print name.__dict__
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del name.offset, name.length
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self.names.append(name)
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def compile(self, ttFont):
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if not hasattr(self, "names"):
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# only happens when there are NO name table entries read
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# from the TTX file
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self.names = []
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names = self.names
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names.sort() # sort according to the spec; see NameRecord.__lt__()
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stringData = b""
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format = 0
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n = len(names)
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stringOffset = 6 + n * sstruct.calcsize(nameRecordFormat)
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data = struct.pack(">HHH", format, n, stringOffset)
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lastoffset = 0
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done = {} # remember the data so we can reuse the "pointers"
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for name in names:
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string = name.toBytes()
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if string in done:
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name.offset, name.length = done[string]
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else:
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name.offset, name.length = done[string] = len(stringData), len(string)
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stringData = bytesjoin([stringData, string])
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data = data + sstruct.pack(nameRecordFormat, name)
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return data + stringData
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def toXML(self, writer, ttFont):
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for name in self.names:
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name.toXML(writer, ttFont)
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def fromXML(self, name, attrs, content, ttFont):
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if name != "namerecord":
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return # ignore unknown tags
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if not hasattr(self, "names"):
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self.names = []
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name = NameRecord()
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self.names.append(name)
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name.fromXML(name, attrs, content, ttFont)
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def getName(self, nameID, platformID, platEncID, langID=None):
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for namerecord in self.names:
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if ( namerecord.nameID == nameID and
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namerecord.platformID == platformID and
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namerecord.platEncID == platEncID):
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if langID is None or namerecord.langID == langID:
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return namerecord
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return None # not found
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def getDebugName(self, nameID):
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englishName = someName = None
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for name in self.names:
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if name.nameID != nameID:
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continue
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try:
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unistr = name.toUnicode()
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except UnicodeDecodeError:
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continue
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someName = unistr
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if (name.platformID, name.langID) in ((1, 0), (3, 0x409)):
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englishName = unistr
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break
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if englishName:
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return englishName
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elif someName:
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return someName
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else:
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return None
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class NameRecord(object):
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def getEncoding(self, default='ascii'):
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"""Returns the Python encoding name for this name entry based on its platformID,
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platEncID, and langID. If encoding for these values is not known, by default
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'ascii' is returned. That can be overriden by passing a value to the default
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argument.
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"""
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return getEncoding(self.platformID, self.platEncID, self.langID, default)
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def encodingIsUnicodeCompatible(self):
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return self.getEncoding(None) in ['utf_16_be', 'ucs2be', 'ascii', 'latin1']
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def __str__(self):
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try:
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return self.toUnicode()
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except UnicodeDecodeError:
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return str(self.string)
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def isUnicode(self):
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return (self.platformID == 0 or
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(self.platformID == 3 and self.platEncID in [0, 1, 10]))
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def toUnicode(self, errors='strict'):
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"""
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If self.string is a Unicode string, return it; otherwise try decoding the
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bytes in self.string to a Unicode string using the encoding of this
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entry as returned by self.getEncoding(); Note that self.getEncoding()
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returns 'ascii' if the encoding is unknown to the library.
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Certain heuristics are performed to recover data from bytes that are
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ill-formed in the chosen encoding, or that otherwise look misencoded
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(mostly around bad UTF-16BE encoded bytes, or bytes that look like UTF-16BE
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but marked otherwise). If the bytes are ill-formed and the heuristics fail,
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the error is handled according to the errors parameter to this function, which is
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passed to the underlying decode() function; by default it throws a
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UnicodeDecodeError exception.
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Note: The mentioned heuristics mean that roundtripping a font to XML and back
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to binary might recover some misencoded data whereas just loading the font
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and saving it back will not change them.
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"""
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def isascii(b):
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return (b >= 0x20 and b <= 0x7E) or b in [0x09, 0x0A, 0x0D]
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encoding = self.getEncoding()
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string = self.string
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if encoding == 'utf_16_be' and len(string) % 2 == 1:
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# Recover badly encoded UTF-16 strings that have an odd number of bytes:
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# - If the last byte is zero, drop it. Otherwise,
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# - If all the odd bytes are zero and all the even bytes are ASCII,
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# prepend one zero byte. Otherwise,
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# - If first byte is zero and all other bytes are ASCII, insert zero
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# bytes between consecutive ASCII bytes.
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#
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# (Yes, I've seen all of these in the wild... sigh)
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if byteord(string[-1]) == 0:
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string = string[:-1]
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elif all(byteord(b) == 0 if i % 2 else isascii(byteord(b)) for i,b in enumerate(string)):
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string = b'\0' + string
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elif byteord(string[0]) == 0 and all(isascii(byteord(b)) for b in string[1:]):
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string = bytesjoin(b'\0'+bytechr(byteord(b)) for b in string[1:])
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string = tounicode(string, encoding=encoding, errors=errors)
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# If decoded strings still looks like UTF-16BE, it suggests a double-encoding.
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# Fix it up.
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if all(ord(c) == 0 if i % 2 == 0 else isascii(ord(c)) for i,c in enumerate(string)):
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# If string claims to be Mac encoding, but looks like UTF-16BE with ASCII text,
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# narrow it down.
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string = ''.join(c for c in string[1::2])
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return string
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def toBytes(self, errors='strict'):
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""" If self.string is a bytes object, return it; otherwise try encoding
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the Unicode string in self.string to bytes using the encoding of this
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entry as returned by self.getEncoding(); Note that self.getEncoding()
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returns 'ascii' if the encoding is unknown to the library.
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If the Unicode string cannot be encoded to bytes in the chosen encoding,
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the error is handled according to the errors parameter to this function,
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which is passed to the underlying encode() function; by default it throws a
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UnicodeEncodeError exception.
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"""
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return tobytes(self.string, encoding=self.getEncoding(), errors=errors)
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def toXML(self, writer, ttFont):
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try:
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unistr = self.toUnicode()
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except UnicodeDecodeError:
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unistr = None
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attrs = [
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("nameID", self.nameID),
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("platformID", self.platformID),
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("platEncID", self.platEncID),
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("langID", hex(self.langID)),
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]
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if unistr is None or not self.encodingIsUnicodeCompatible():
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attrs.append(("unicode", unistr is not None))
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writer.begintag("namerecord", attrs)
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writer.newline()
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if unistr is not None:
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writer.write(unistr)
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else:
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writer.write8bit(self.string)
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writer.newline()
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writer.endtag("namerecord")
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writer.newline()
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def fromXML(self, name, attrs, content, ttFont):
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self.nameID = safeEval(attrs["nameID"])
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self.platformID = safeEval(attrs["platformID"])
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self.platEncID = safeEval(attrs["platEncID"])
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self.langID = safeEval(attrs["langID"])
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s = strjoin(content).strip()
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encoding = self.getEncoding()
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if self.encodingIsUnicodeCompatible() or safeEval(attrs.get("unicode", "False")):
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self.string = s.encode(encoding)
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else:
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# This is the inverse of write8bit...
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self.string = s.encode("latin1")
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def __lt__(self, other):
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if type(self) != type(other):
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return NotImplemented
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# implemented so that list.sort() sorts according to the spec.
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selfTuple = (
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getattr(self, "platformID", None),
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getattr(self, "platEncID", None),
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getattr(self, "langID", None),
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getattr(self, "nameID", None),
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getattr(self, "string", None),
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)
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otherTuple = (
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getattr(other, "platformID", None),
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getattr(other, "platEncID", None),
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getattr(other, "langID", None),
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getattr(other, "nameID", None),
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getattr(other, "string", None),
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)
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return selfTuple < otherTuple
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def __repr__(self):
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return "<NameRecord NameID=%d; PlatformID=%d; LanguageID=%d>" % (
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self.nameID, self.platformID, self.langID)
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