| """fontTools.t1Lib.py -- Tools for PostScript Type 1 fonts |
| |
| Functions for reading and writing raw Type 1 data: |
| |
| read(path) |
| reads any Type 1 font file, returns the raw data and a type indicator: |
| 'LWFN', 'PFB' or 'OTHER', depending on the format of the file pointed |
| to by 'path'. |
| Raises an error when the file does not contain valid Type 1 data. |
| |
| write(path, data, kind='OTHER', dohex=0) |
| writes raw Type 1 data to the file pointed to by 'path'. |
| 'kind' can be one of 'LWFN', 'PFB' or 'OTHER'; it defaults to 'OTHER'. |
| 'dohex' is a flag which determines whether the eexec encrypted |
| part should be written as hexadecimal or binary, but only if kind |
| is 'LWFN' or 'PFB'. |
| """ |
| |
| __author__ = "jvr" |
| __version__ = "1.0b2" |
| DEBUG = 0 |
| |
| from fontTools.misc import eexec |
| from fontTools.misc.macCreatorType import getMacCreatorAndType |
| import string |
| import re |
| import os |
| |
| |
| try: |
| try: |
| from Carbon import Res |
| except ImportError: |
| import Res # MacPython < 2.2 |
| except ImportError: |
| haveMacSupport = 0 |
| else: |
| haveMacSupport = 1 |
| import MacOS |
| |
| |
| class T1Error(Exception): pass |
| |
| |
| class T1Font: |
| |
| """Type 1 font class. |
| |
| Uses a minimal interpeter that supports just about enough PS to parse |
| Type 1 fonts. |
| """ |
| |
| def __init__(self, path=None): |
| if path is not None: |
| self.data, type = read(path) |
| else: |
| pass # XXX |
| |
| def saveAs(self, path, type): |
| write(path, self.getData(), type) |
| |
| def getData(self): |
| # XXX Todo: if the data has been converted to Python object, |
| # recreate the PS stream |
| return self.data |
| |
| def getGlyphSet(self): |
| """Return a generic GlyphSet, which is a dict-like object |
| mapping glyph names to glyph objects. The returned glyph objects |
| have a .draw() method that supports the Pen protocol, and will |
| have an attribute named 'width', but only *after* the .draw() method |
| has been called. |
| |
| In the case of Type 1, the GlyphSet is simply the CharStrings dict. |
| """ |
| return self["CharStrings"] |
| |
| def __getitem__(self, key): |
| if not hasattr(self, "font"): |
| self.parse() |
| return self.font[key] |
| |
| def parse(self): |
| from fontTools.misc import psLib |
| from fontTools.misc import psCharStrings |
| self.font = psLib.suckfont(self.data) |
| charStrings = self.font["CharStrings"] |
| lenIV = self.font["Private"].get("lenIV", 4) |
| assert lenIV >= 0 |
| subrs = self.font["Private"]["Subrs"] |
| for glyphName, charString in charStrings.items(): |
| charString, R = eexec.decrypt(charString, 4330) |
| charStrings[glyphName] = psCharStrings.T1CharString(charString[lenIV:], |
| subrs=subrs) |
| for i in range(len(subrs)): |
| charString, R = eexec.decrypt(subrs[i], 4330) |
| subrs[i] = psCharStrings.T1CharString(charString[lenIV:], subrs=subrs) |
| del self.data |
| |
| |
| # low level T1 data read and write functions |
| |
| def read(path, onlyHeader=0): |
| """reads any Type 1 font file, returns raw data""" |
| normpath = string.lower(path) |
| creator, type = getMacCreatorAndType(path) |
| if type == 'LWFN': |
| return readLWFN(path, onlyHeader), 'LWFN' |
| if normpath[-4:] == '.pfb': |
| return readPFB(path, onlyHeader), 'PFB' |
| else: |
| return readOther(path), 'OTHER' |
| |
| def write(path, data, kind='OTHER', dohex=0): |
| assertType1(data) |
| kind = string.upper(kind) |
| try: |
| os.remove(path) |
| except os.error: |
| pass |
| err = 1 |
| try: |
| if kind == 'LWFN': |
| writeLWFN(path, data) |
| elif kind == 'PFB': |
| writePFB(path, data) |
| else: |
| writeOther(path, data, dohex) |
| err = 0 |
| finally: |
| if err and not DEBUG: |
| try: |
| os.remove(path) |
| except os.error: |
| pass |
| |
| |
| # -- internal -- |
| |
| LWFNCHUNKSIZE = 2000 |
| HEXLINELENGTH = 80 |
| |
| |
| def readLWFN(path, onlyHeader=0): |
| """reads an LWFN font file, returns raw data""" |
| resRef = Res.FSOpenResFile(path, 1) # read-only |
| try: |
| Res.UseResFile(resRef) |
| n = Res.Count1Resources('POST') |
| data = [] |
| for i in range(501, 501 + n): |
| res = Res.Get1Resource('POST', i) |
| code = ord(res.data[0]) |
| if ord(res.data[1]) <> 0: |
| raise T1Error, 'corrupt LWFN file' |
| if code in [1, 2]: |
| if onlyHeader and code == 2: |
| break |
| data.append(res.data[2:]) |
| elif code in [3, 5]: |
| break |
| elif code == 4: |
| f = open(path, "rb") |
| data.append(f.read()) |
| f.close() |
| elif code == 0: |
| pass # comment, ignore |
| else: |
| raise T1Error, 'bad chunk code: ' + `code` |
| finally: |
| Res.CloseResFile(resRef) |
| data = string.join(data, '') |
| assertType1(data) |
| return data |
| |
| def readPFB(path, onlyHeader=0): |
| """reads a PFB font file, returns raw data""" |
| f = open(path, "rb") |
| data = [] |
| while 1: |
| if f.read(1) <> chr(128): |
| raise T1Error, 'corrupt PFB file' |
| code = ord(f.read(1)) |
| if code in [1, 2]: |
| chunklen = stringToLong(f.read(4)) |
| chunk = f.read(chunklen) |
| assert len(chunk) == chunklen |
| data.append(chunk) |
| elif code == 3: |
| break |
| else: |
| raise T1Error, 'bad chunk code: ' + `code` |
| if onlyHeader: |
| break |
| f.close() |
| data = string.join(data, '') |
| assertType1(data) |
| return data |
| |
| def readOther(path): |
| """reads any (font) file, returns raw data""" |
| f = open(path, "rb") |
| data = f.read() |
| f.close() |
| assertType1(data) |
| |
| chunks = findEncryptedChunks(data) |
| data = [] |
| for isEncrypted, chunk in chunks: |
| if isEncrypted and isHex(chunk[:4]): |
| data.append(deHexString(chunk)) |
| else: |
| data.append(chunk) |
| return string.join(data, '') |
| |
| # file writing tools |
| |
| def writeLWFN(path, data): |
| Res.FSpCreateResFile(path, "just", "LWFN", 0) |
| resRef = Res.FSOpenResFile(path, 2) # write-only |
| try: |
| Res.UseResFile(resRef) |
| resID = 501 |
| chunks = findEncryptedChunks(data) |
| for isEncrypted, chunk in chunks: |
| if isEncrypted: |
| code = 2 |
| else: |
| code = 1 |
| while chunk: |
| res = Res.Resource(chr(code) + '\0' + chunk[:LWFNCHUNKSIZE - 2]) |
| res.AddResource('POST', resID, '') |
| chunk = chunk[LWFNCHUNKSIZE - 2:] |
| resID = resID + 1 |
| res = Res.Resource(chr(5) + '\0') |
| res.AddResource('POST', resID, '') |
| finally: |
| Res.CloseResFile(resRef) |
| |
| def writePFB(path, data): |
| chunks = findEncryptedChunks(data) |
| f = open(path, "wb") |
| try: |
| for isEncrypted, chunk in chunks: |
| if isEncrypted: |
| code = 2 |
| else: |
| code = 1 |
| f.write(chr(128) + chr(code)) |
| f.write(longToString(len(chunk))) |
| f.write(chunk) |
| f.write(chr(128) + chr(3)) |
| finally: |
| f.close() |
| |
| def writeOther(path, data, dohex = 0): |
| chunks = findEncryptedChunks(data) |
| f = open(path, "wb") |
| try: |
| hexlinelen = HEXLINELENGTH / 2 |
| for isEncrypted, chunk in chunks: |
| if isEncrypted: |
| code = 2 |
| else: |
| code = 1 |
| if code == 2 and dohex: |
| while chunk: |
| f.write(eexec.hexString(chunk[:hexlinelen])) |
| f.write('\r') |
| chunk = chunk[hexlinelen:] |
| else: |
| f.write(chunk) |
| finally: |
| f.close() |
| |
| |
| # decryption tools |
| |
| EEXECBEGIN = "currentfile eexec" |
| EEXECEND = '0' * 64 |
| EEXECINTERNALEND = "currentfile closefile" |
| EEXECBEGINMARKER = "%-- eexec start\r" |
| EEXECENDMARKER = "%-- eexec end\r" |
| |
| _ishexRE = re.compile('[0-9A-Fa-f]*$') |
| |
| def isHex(text): |
| return _ishexRE.match(text) is not None |
| |
| |
| def decryptType1(data): |
| chunks = findEncryptedChunks(data) |
| data = [] |
| for isEncrypted, chunk in chunks: |
| if isEncrypted: |
| if isHex(chunk[:4]): |
| chunk = deHexString(chunk) |
| decrypted, R = eexec.decrypt(chunk, 55665) |
| decrypted = decrypted[4:] |
| if decrypted[-len(EEXECINTERNALEND)-1:-1] <> EEXECINTERNALEND \ |
| and decrypted[-len(EEXECINTERNALEND)-2:-2] <> EEXECINTERNALEND: |
| raise T1Error, "invalid end of eexec part" |
| decrypted = decrypted[:-len(EEXECINTERNALEND)-2] + '\r' |
| data.append(EEXECBEGINMARKER + decrypted + EEXECENDMARKER) |
| else: |
| if chunk[-len(EEXECBEGIN)-1:-1] == EEXECBEGIN: |
| data.append(chunk[:-len(EEXECBEGIN)-1]) |
| else: |
| data.append(chunk) |
| return string.join(data, '') |
| |
| def findEncryptedChunks(data): |
| chunks = [] |
| while 1: |
| eBegin = string.find(data, EEXECBEGIN) |
| if eBegin < 0: |
| break |
| eBegin = eBegin + len(EEXECBEGIN) + 1 |
| eEnd = string.find(data, EEXECEND, eBegin) |
| if eEnd < 0: |
| raise T1Error, "can't find end of eexec part" |
| cypherText = data[eBegin:eEnd + 2] |
| if isHex(cypherText[:4]): |
| cypherText = deHexString(cypherText) |
| plainText, R = eexec.decrypt(cypherText, 55665) |
| eEndLocal = string.find(plainText, EEXECINTERNALEND) |
| if eEndLocal < 0: |
| raise T1Error, "can't find end of eexec part" |
| chunks.append((0, data[:eBegin])) |
| chunks.append((1, cypherText[:eEndLocal + len(EEXECINTERNALEND) + 1])) |
| data = data[eEnd:] |
| chunks.append((0, data)) |
| return chunks |
| |
| def deHexString(hexstring): |
| return eexec.deHexString(string.join(string.split(hexstring), "")) |
| |
| |
| # Type 1 assertion |
| |
| _fontType1RE = re.compile(r"/FontType\s+1\s+def") |
| |
| def assertType1(data): |
| for head in ['%!PS-AdobeFont', '%!FontType1']: |
| if data[:len(head)] == head: |
| break |
| else: |
| raise T1Error, "not a PostScript font" |
| if not _fontType1RE.search(data): |
| raise T1Error, "not a Type 1 font" |
| if string.find(data, "currentfile eexec") < 0: |
| raise T1Error, "not an encrypted Type 1 font" |
| # XXX what else? |
| return data |
| |
| |
| # pfb helpers |
| |
| def longToString(long): |
| str = "" |
| for i in range(4): |
| str = str + chr((long & (0xff << (i * 8))) >> i * 8) |
| return str |
| |
| def stringToLong(str): |
| if len(str) <> 4: |
| raise ValueError, 'string must be 4 bytes long' |
| long = 0 |
| for i in range(4): |
| long = long + (ord(str[i]) << (i * 8)) |
| return long |
| |