"""ttLib.tables.ttProgram.py -- Assembler/disassembler for TrueType bytecode programs.""" from __future__ import annotations from fontTools.misc.textTools import num2binary, binary2num, readHex, strjoin import array from io import StringIO from typing import List import re import logging log = logging.getLogger(__name__) # fmt: off # first, the list of instructions that eat bytes or words from the instruction stream streamInstructions = [ # # opcode mnemonic argBits descriptive name pops pushes eats from instruction stream pushes # (0x40, 'NPUSHB', 0, 'PushNBytes', 0, -1), # n, b1, b2,...bn b1,b2...bn (0x41, 'NPUSHW', 0, 'PushNWords', 0, -1), # n, w1, w2,...w w1,w2...wn (0xb0, 'PUSHB', 3, 'PushBytes', 0, -1), # b0, b1,..bn b0, b1, ...,bn (0xb8, 'PUSHW', 3, 'PushWords', 0, -1), # w0,w1,..wn w0 ,w1, ...wn ] # next, the list of "normal" instructions instructions = [ # # opcode mnemonic argBits descriptive name pops pushes eats from instruction stream pushes # (0x7f, 'AA', 0, 'AdjustAngle', 1, 0), # p - (0x64, 'ABS', 0, 'Absolute', 1, 1), # n |n| (0x60, 'ADD', 0, 'Add', 2, 1), # n2, n1 (n1 + n2) (0x27, 'ALIGNPTS', 0, 'AlignPts', 2, 0), # p2, p1 - (0x3c, 'ALIGNRP', 0, 'AlignRelativePt', -1, 0), # p1, p2, ... , ploopvalue - (0x5a, 'AND', 0, 'LogicalAnd', 2, 1), # e2, e1 b (0x2b, 'CALL', 0, 'CallFunction', 1, 0), # f - (0x67, 'CEILING', 0, 'Ceiling', 1, 1), # n ceil(n) (0x25, 'CINDEX', 0, 'CopyXToTopStack', 1, 1), # k ek (0x22, 'CLEAR', 0, 'ClearStack', -1, 0), # all items on the stack - (0x4f, 'DEBUG', 0, 'DebugCall', 1, 0), # n - (0x73, 'DELTAC1', 0, 'DeltaExceptionC1', -1, 0), # argn, cn, argn-1,cn-1, , arg1, c1 - (0x74, 'DELTAC2', 0, 'DeltaExceptionC2', -1, 0), # argn, cn, argn-1,cn-1, , arg1, c1 - (0x75, 'DELTAC3', 0, 'DeltaExceptionC3', -1, 0), # argn, cn, argn-1,cn-1, , arg1, c1 - (0x5d, 'DELTAP1', 0, 'DeltaExceptionP1', -1, 0), # argn, pn, argn-1, pn-1, , arg1, p1 - (0x71, 'DELTAP2', 0, 'DeltaExceptionP2', -1, 0), # argn, pn, argn-1, pn-1, , arg1, p1 - (0x72, 'DELTAP3', 0, 'DeltaExceptionP3', -1, 0), # argn, pn, argn-1, pn-1, , arg1, p1 - (0x24, 'DEPTH', 0, 'GetDepthStack', 0, 1), # - n (0x62, 'DIV', 0, 'Divide', 2, 1), # n2, n1 (n1 * 64)/ n2 (0x20, 'DUP', 0, 'DuplicateTopStack', 1, 2), # e e, e (0x59, 'EIF', 0, 'EndIf', 0, 0), # - - (0x1b, 'ELSE', 0, 'Else', 0, 0), # - - (0x2d, 'ENDF', 0, 'EndFunctionDefinition', 0, 0), # - - (0x54, 'EQ', 0, 'Equal', 2, 1), # e2, e1 b (0x57, 'EVEN', 0, 'Even', 1, 1), # e b (0x2c, 'FDEF', 0, 'FunctionDefinition', 1, 0), # f - (0x4e, 'FLIPOFF', 0, 'SetAutoFlipOff', 0, 0), # - - (0x4d, 'FLIPON', 0, 'SetAutoFlipOn', 0, 0), # - - (0x80, 'FLIPPT', 0, 'FlipPoint', -1, 0), # p1, p2, ..., ploopvalue - (0x82, 'FLIPRGOFF', 0, 'FlipRangeOff', 2, 0), # h, l - (0x81, 'FLIPRGON', 0, 'FlipRangeOn', 2, 0), # h, l - (0x66, 'FLOOR', 0, 'Floor', 1, 1), # n floor(n) (0x46, 'GC', 1, 'GetCoordOnPVector', 1, 1), # p c (0x88, 'GETINFO', 0, 'GetInfo', 1, 1), # selector result (0x91, 'GETVARIATION', 0, 'GetVariation', 0, -1), # - a1,..,an (0x0d, 'GFV', 0, 'GetFVector', 0, 2), # - px, py (0x0c, 'GPV', 0, 'GetPVector', 0, 2), # - px, py (0x52, 'GT', 0, 'GreaterThan', 2, 1), # e2, e1 b (0x53, 'GTEQ', 0, 'GreaterThanOrEqual', 2, 1), # e2, e1 b (0x89, 'IDEF', 0, 'InstructionDefinition', 1, 0), # f - (0x58, 'IF', 0, 'If', 1, 0), # e - (0x8e, 'INSTCTRL', 0, 'SetInstrExecControl', 2, 0), # s, v - (0x39, 'IP', 0, 'InterpolatePts', -1, 0), # p1, p2, ... , ploopvalue - (0x0f, 'ISECT', 0, 'MovePtToIntersect', 5, 0), # a1, a0, b1, b0, p - (0x30, 'IUP', 1, 'InterpolateUntPts', 0, 0), # - - (0x1c, 'JMPR', 0, 'Jump', 1, 0), # offset - (0x79, 'JROF', 0, 'JumpRelativeOnFalse', 2, 0), # e, offset - (0x78, 'JROT', 0, 'JumpRelativeOnTrue', 2, 0), # e, offset - (0x2a, 'LOOPCALL', 0, 'LoopAndCallFunction', 2, 0), # f, count - (0x50, 'LT', 0, 'LessThan', 2, 1), # e2, e1 b (0x51, 'LTEQ', 0, 'LessThenOrEqual', 2, 1), # e2, e1 b (0x8b, 'MAX', 0, 'Maximum', 2, 1), # e2, e1 max(e1, e2) (0x49, 'MD', 1, 'MeasureDistance', 2, 1), # p2,p1 d (0x2e, 'MDAP', 1, 'MoveDirectAbsPt', 1, 0), # p - (0xc0, 'MDRP', 5, 'MoveDirectRelPt', 1, 0), # p - (0x3e, 'MIAP', 1, 'MoveIndirectAbsPt', 2, 0), # n, p - (0x8c, 'MIN', 0, 'Minimum', 2, 1), # e2, e1 min(e1, e2) (0x26, 'MINDEX', 0, 'MoveXToTopStack', 1, 1), # k ek (0xe0, 'MIRP', 5, 'MoveIndirectRelPt', 2, 0), # n, p - (0x4b, 'MPPEM', 0, 'MeasurePixelPerEm', 0, 1), # - ppem (0x4c, 'MPS', 0, 'MeasurePointSize', 0, 1), # - pointSize (0x3a, 'MSIRP', 1, 'MoveStackIndirRelPt', 2, 0), # d, p - (0x63, 'MUL', 0, 'Multiply', 2, 1), # n2, n1 (n1 * n2)/64 (0x65, 'NEG', 0, 'Negate', 1, 1), # n -n (0x55, 'NEQ', 0, 'NotEqual', 2, 1), # e2, e1 b (0x5c, 'NOT', 0, 'LogicalNot', 1, 1), # e ( not e ) (0x6c, 'NROUND', 2, 'NoRound', 1, 1), # n1 n2 (0x56, 'ODD', 0, 'Odd', 1, 1), # e b (0x5b, 'OR', 0, 'LogicalOr', 2, 1), # e2, e1 b (0x21, 'POP', 0, 'PopTopStack', 1, 0), # e - (0x45, 'RCVT', 0, 'ReadCVT', 1, 1), # location value (0x7d, 'RDTG', 0, 'RoundDownToGrid', 0, 0), # - - (0x7a, 'ROFF', 0, 'RoundOff', 0, 0), # - - (0x8a, 'ROLL', 0, 'RollTopThreeStack', 3, 3), # a,b,c b,a,c (0x68, 'ROUND', 2, 'Round', 1, 1), # n1 n2 (0x43, 'RS', 0, 'ReadStore', 1, 1), # n v (0x3d, 'RTDG', 0, 'RoundToDoubleGrid', 0, 0), # - - (0x18, 'RTG', 0, 'RoundToGrid', 0, 0), # - - (0x19, 'RTHG', 0, 'RoundToHalfGrid', 0, 0), # - - (0x7c, 'RUTG', 0, 'RoundUpToGrid', 0, 0), # - - (0x77, 'S45ROUND', 0, 'SuperRound45Degrees', 1, 0), # n - (0x7e, 'SANGW', 0, 'SetAngleWeight', 1, 0), # weight - (0x85, 'SCANCTRL', 0, 'ScanConversionControl', 1, 0), # n - (0x8d, 'SCANTYPE', 0, 'ScanType', 1, 0), # n - (0x48, 'SCFS', 0, 'SetCoordFromStackFP', 2, 0), # c, p - (0x1d, 'SCVTCI', 0, 'SetCVTCutIn', 1, 0), # n - (0x5e, 'SDB', 0, 'SetDeltaBaseInGState', 1, 0), # n - (0x86, 'SDPVTL', 1, 'SetDualPVectorToLine', 2, 0), # p2, p1 - (0x5f, 'SDS', 0, 'SetDeltaShiftInGState', 1, 0), # n - (0x0b, 'SFVFS', 0, 'SetFVectorFromStack', 2, 0), # y, x - (0x04, 'SFVTCA', 1, 'SetFVectorToAxis', 0, 0), # - - (0x08, 'SFVTL', 1, 'SetFVectorToLine', 2, 0), # p2, p1 - (0x0e, 'SFVTPV', 0, 'SetFVectorToPVector', 0, 0), # - - (0x34, 'SHC', 1, 'ShiftContourByLastPt', 1, 0), # c - (0x32, 'SHP', 1, 'ShiftPointByLastPoint', -1, 0), # p1, p2, ..., ploopvalue - (0x38, 'SHPIX', 0, 'ShiftZoneByPixel', -1, 0), # d, p1, p2, ..., ploopvalue - (0x36, 'SHZ', 1, 'ShiftZoneByLastPoint', 1, 0), # e - (0x17, 'SLOOP', 0, 'SetLoopVariable', 1, 0), # n - (0x1a, 'SMD', 0, 'SetMinimumDistance', 1, 0), # distance - (0x0a, 'SPVFS', 0, 'SetPVectorFromStack', 2, 0), # y, x - (0x02, 'SPVTCA', 1, 'SetPVectorToAxis', 0, 0), # - - (0x06, 'SPVTL', 1, 'SetPVectorToLine', 2, 0), # p2, p1 - (0x76, 'SROUND', 0, 'SuperRound', 1, 0), # n - (0x10, 'SRP0', 0, 'SetRefPoint0', 1, 0), # p - (0x11, 'SRP1', 0, 'SetRefPoint1', 1, 0), # p - (0x12, 'SRP2', 0, 'SetRefPoint2', 1, 0), # p - (0x1f, 'SSW', 0, 'SetSingleWidth', 1, 0), # n - (0x1e, 'SSWCI', 0, 'SetSingleWidthCutIn', 1, 0), # n - (0x61, 'SUB', 0, 'Subtract', 2, 1), # n2, n1 (n1 - n2) (0x00, 'SVTCA', 1, 'SetFPVectorToAxis', 0, 0), # - - (0x23, 'SWAP', 0, 'SwapTopStack', 2, 2), # e2, e1 e1, e2 (0x13, 'SZP0', 0, 'SetZonePointer0', 1, 0), # n - (0x14, 'SZP1', 0, 'SetZonePointer1', 1, 0), # n - (0x15, 'SZP2', 0, 'SetZonePointer2', 1, 0), # n - (0x16, 'SZPS', 0, 'SetZonePointerS', 1, 0), # n - (0x29, 'UTP', 0, 'UnTouchPt', 1, 0), # p - (0x70, 'WCVTF', 0, 'WriteCVTInFUnits', 2, 0), # n, l - (0x44, 'WCVTP', 0, 'WriteCVTInPixels', 2, 0), # v, l - (0x42, 'WS', 0, 'WriteStore', 2, 0), # v, l - ] # fmt: on def bitRepr(value, bits): s = "" for i in range(bits): s = "01"[value & 0x1] + s value = value >> 1 return s _mnemonicPat = re.compile(r"[A-Z][A-Z0-9]*$") def _makeDict(instructionList): opcodeDict = {} mnemonicDict = {} for op, mnemonic, argBits, name, pops, pushes in instructionList: assert _mnemonicPat.match(mnemonic) mnemonicDict[mnemonic] = op, argBits, name if argBits: argoffset = op for i in range(1 << argBits): opcodeDict[op + i] = mnemonic, argBits, argoffset, name else: opcodeDict[op] = mnemonic, 0, 0, name return opcodeDict, mnemonicDict streamOpcodeDict, streamMnemonicDict = _makeDict(streamInstructions) opcodeDict, mnemonicDict = _makeDict(instructions) class tt_instructions_error(Exception): def __init__(self, error): self.error = error def __str__(self): return "TT instructions error: %s" % repr(self.error) _comment = r"/\*.*?\*/" _instruction = r"([A-Z][A-Z0-9]*)\s*\[(.*?)\]" _number = r"-?[0-9]+" _token = "(%s)|(%s)|(%s)" % (_instruction, _number, _comment) _tokenRE = re.compile(_token) _whiteRE = re.compile(r"\s*") _pushCountPat = re.compile(r"[A-Z][A-Z0-9]*\s*\[.*?\]\s*/\* ([0-9]+).*?\*/") _indentRE = re.compile(r"^FDEF|IF|ELSE\[ \]\t.+") _unindentRE = re.compile(r"^ELSE|ENDF|EIF\[ \]\t.+") def _skipWhite(data, pos): m = _whiteRE.match(data, pos) newPos = m.regs[0][1] assert newPos >= pos return newPos class Program(object): def __init__(self) -> None: pass def fromBytecode(self, bytecode: bytes) -> None: self.bytecode = array.array("B", bytecode) if hasattr(self, "assembly"): del self.assembly def fromAssembly(self, assembly: List[str] | str) -> None: if isinstance(assembly, list): self.assembly = assembly elif isinstance(assembly, str): self.assembly = assembly.splitlines() else: raise TypeError(f"expected str or List[str], got {type(assembly).__name__}") if hasattr(self, "bytecode"): del self.bytecode def getBytecode(self) -> bytes: if not hasattr(self, "bytecode"): self._assemble() return self.bytecode.tobytes() def getAssembly(self, preserve=True) -> List[str]: if not hasattr(self, "assembly"): self._disassemble(preserve=preserve) return self.assembly def toXML(self, writer, ttFont) -> None: if ( not hasattr(ttFont, "disassembleInstructions") or ttFont.disassembleInstructions ): try: assembly = self.getAssembly() except: import traceback tmp = StringIO() traceback.print_exc(file=tmp) msg = "An exception occurred during the decompilation of glyph program:\n\n" msg += tmp.getvalue() log.error(msg) writer.begintag("bytecode") writer.newline() writer.comment(msg.strip()) writer.newline() writer.dumphex(self.getBytecode()) writer.endtag("bytecode") writer.newline() else: if not assembly: return writer.begintag("assembly") writer.newline() i = 0 indent = 0 nInstr = len(assembly) while i < nInstr: instr = assembly[i] if _unindentRE.match(instr): indent -= 1 writer.write(writer.indentwhite * indent) writer.write(instr) writer.newline() m = _pushCountPat.match(instr) i = i + 1 if m: nValues = int(m.group(1)) line: List[str] = [] j = 0 for j in range(nValues): if j and not (j % 25): writer.write(writer.indentwhite * indent) writer.write(" ".join(line)) writer.newline() line = [] line.append(assembly[i + j]) writer.write(writer.indentwhite * indent) writer.write(" ".join(line)) writer.newline() i = i + j + 1 if _indentRE.match(instr): indent += 1 writer.endtag("assembly") writer.newline() else: bytecode = self.getBytecode() if not bytecode: return writer.begintag("bytecode") writer.newline() writer.dumphex(bytecode) writer.endtag("bytecode") writer.newline() def fromXML(self, name, attrs, content, ttFont) -> None: if name == "assembly": self.fromAssembly(strjoin(content)) self._assemble() del self.assembly else: assert name == "bytecode" self.fromBytecode(readHex(content)) def _assemble(self) -> None: assembly = " ".join(getattr(self, "assembly", [])) bytecode: List[int] = [] push = bytecode.append lenAssembly = len(assembly) pos = _skipWhite(assembly, 0) while pos < lenAssembly: m = _tokenRE.match(assembly, pos) if m is None: raise tt_instructions_error( "Syntax error in TT program (%s)" % assembly[pos - 5 : pos + 15] ) dummy, mnemonic, arg, number, comment = m.groups() pos = m.regs[0][1] if comment: pos = _skipWhite(assembly, pos) continue arg = arg.strip() if mnemonic.startswith("INSTR"): # Unknown instruction op = int(mnemonic[5:]) push(op) elif mnemonic not in ("PUSH", "NPUSHB", "NPUSHW", "PUSHB", "PUSHW"): op, argBits, name = mnemonicDict[mnemonic] if len(arg) != argBits: raise tt_instructions_error( "Incorrect number of argument bits (%s[%s])" % (mnemonic, arg) ) if arg: arg = binary2num(arg) push(op + arg) else: push(op) else: args = [] pos = _skipWhite(assembly, pos) while pos < lenAssembly: m = _tokenRE.match(assembly, pos) if m is None: raise tt_instructions_error( "Syntax error in TT program (%s)" % assembly[pos : pos + 15] ) dummy, _mnemonic, arg, number, comment = m.groups() if number is None and comment is None: break pos = m.regs[0][1] pos = _skipWhite(assembly, pos) if comment is not None: continue args.append(int(number)) nArgs = len(args) if mnemonic == "PUSH": # Automatically choose the most compact representation nWords = 0 while nArgs: while ( nWords < nArgs and nWords < 255 and not (0 <= args[nWords] <= 255) ): nWords += 1 nBytes = 0 while ( nWords + nBytes < nArgs and nBytes < 255 and 0 <= args[nWords + nBytes] <= 255 ): nBytes += 1 if ( nBytes < 2 and nWords + nBytes < 255 and nWords + nBytes != nArgs ): # Will write bytes as words nWords += nBytes continue # Write words if nWords: if nWords <= 8: op, argBits, name = streamMnemonicDict["PUSHW"] op = op + nWords - 1 push(op) else: op, argBits, name = streamMnemonicDict["NPUSHW"] push(op) push(nWords) for value in args[:nWords]: assert -32768 <= value < 32768, ( "PUSH value out of range %d" % value ) push((value >> 8) & 0xFF) push(value & 0xFF) # Write bytes if nBytes: pass if nBytes <= 8: op, argBits, name = streamMnemonicDict["PUSHB"] op = op + nBytes - 1 push(op) else: op, argBits, name = streamMnemonicDict["NPUSHB"] push(op) push(nBytes) for value in args[nWords : nWords + nBytes]: push(value) nTotal = nWords + nBytes args = args[nTotal:] nArgs -= nTotal nWords = 0 else: # Write exactly what we've been asked to words = mnemonic[-1] == "W" op, argBits, name = streamMnemonicDict[mnemonic] if mnemonic[0] != "N": assert nArgs <= 8, nArgs op = op + nArgs - 1 push(op) else: assert nArgs < 256 push(op) push(nArgs) if words: for value in args: assert -32768 <= value < 32768, ( "PUSHW value out of range %d" % value ) push((value >> 8) & 0xFF) push(value & 0xFF) else: for value in args: assert 0 <= value < 256, ( "PUSHB value out of range %d" % value ) push(value) pos = _skipWhite(assembly, pos) if bytecode: assert max(bytecode) < 256 and min(bytecode) >= 0 self.bytecode = array.array("B", bytecode) def _disassemble(self, preserve=False) -> None: assembly = [] i = 0 bytecode = getattr(self, "bytecode", []) numBytecode = len(bytecode) while i < numBytecode: op = bytecode[i] try: mnemonic, argBits, argoffset, name = opcodeDict[op] except KeyError: if op in streamOpcodeDict: values = [] # Merge consecutive PUSH operations while bytecode[i] in streamOpcodeDict: op = bytecode[i] mnemonic, argBits, argoffset, name = streamOpcodeDict[op] words = mnemonic[-1] == "W" if argBits: nValues = op - argoffset + 1 else: i = i + 1 nValues = bytecode[i] i = i + 1 assert nValues > 0 if not words: for j in range(nValues): value = bytecode[i] values.append(repr(value)) i = i + 1 else: for j in range(nValues): # cast to signed int16 value = (bytecode[i] << 8) | bytecode[i + 1] if value >= 0x8000: value = value - 0x10000 values.append(repr(value)) i = i + 2 if preserve: break if not preserve: mnemonic = "PUSH" nValues = len(values) if nValues == 1: assembly.append("%s[ ] /* 1 value pushed */" % mnemonic) else: assembly.append( "%s[ ] /* %s values pushed */" % (mnemonic, nValues) ) assembly.extend(values) else: assembly.append("INSTR%d[ ]" % op) i = i + 1 else: if argBits: assembly.append( mnemonic + "[%s] /* %s */" % (num2binary(op - argoffset, argBits), name) ) else: assembly.append(mnemonic + "[ ] /* %s */" % name) i = i + 1 self.assembly = assembly def __bool__(self) -> bool: """ >>> p = Program() >>> bool(p) False >>> bc = array.array("B", [0]) >>> p.fromBytecode(bc) >>> bool(p) True >>> p.bytecode.pop() 0 >>> bool(p) False >>> p = Program() >>> asm = ['SVTCA[0]'] >>> p.fromAssembly(asm) >>> bool(p) True >>> p.assembly.pop() 'SVTCA[0]' >>> bool(p) False """ return (hasattr(self, "assembly") and len(self.assembly) > 0) or ( hasattr(self, "bytecode") and len(self.bytecode) > 0 ) __nonzero__ = __bool__ def __eq__(self, other) -> bool: if type(self) != type(other): return NotImplemented return self.__dict__ == other.__dict__ def __ne__(self, other) -> bool: result = self.__eq__(other) return result if result is NotImplemented else not result def _test(): """ >>> _test() True """ bc = b"""@;:9876543210/.-,+*)(\'&%$#"! \037\036\035\034\033\032\031\030\027\026\025\024\023\022\021\020\017\016\015\014\013\012\011\010\007\006\005\004\003\002\001\000,\001\260\030CXEj\260\031C`\260F#D#\020 \260FN\360M/\260\000\022\033!#\0213Y-,\001\260\030CX\260\005+\260\000\023K\260\024PX\261\000@8Y\260\006+\033!#\0213Y-,\001\260\030CXN\260\003%\020\362!\260\000\022M\033 E\260\004%\260\004%#Jad\260(RX!#\020\326\033\260\003%\020\362!\260\000\022YY-,\260\032CX!!\033\260\002%\260\002%I\260\003%\260\003%Ja 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