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import logging
import struct
from io import BytesIO
from typing import (
TYPE_CHECKING,
Any,
BinaryIO,
Dict,
Iterable,
Iterator,
List,
Mapping,
Optional,
Tuple,
Union,
cast,
)
from pdf2zh import settings
from pdf2zh.cmapdb import (
CMap,
CMapBase,
CMapDB,
CMapParser,
FileUnicodeMap,
IdentityUnicodeMap,
UnicodeMap,
)
from pdf2zh.encodingdb import EncodingDB, name2unicode
from pdf2zh.fontmetrics import FONT_METRICS
from pdf2zh.pdfexceptions import PDFException, PDFKeyError, PDFValueError
from pdf2zh.pdftypes import (
PDFStream,
dict_value,
int_value,
list_value,
num_value,
resolve1,
resolve_all,
stream_value,
)
from pdf2zh.psexceptions import PSEOF
from pdf2zh.psparser import (
KWD,
LIT,
PSKeyword,
PSLiteral,
PSStackParser,
literal_name,
)
from pdf2zh.utils import Matrix, Point, Rect, apply_matrix_norm, choplist, nunpack
if TYPE_CHECKING:
from pdf2zh.pdfinterp import PDFResourceManager
log = logging.getLogger(__name__)
def get_widths(seq: Iterable[object]) -> Dict[int, float]:
"""Build a mapping of character widths for horizontal writing."""
widths: Dict[int, float] = {}
r: List[float] = []
for v in seq:
if isinstance(v, list):
if r:
char1 = r[-1]
for i, w in enumerate(v):
widths[cast(int, char1) + i] = w
r = []
elif isinstance(v, (int, float)): # == utils.isnumber(v)
r.append(v)
if len(r) == 3:
(char1, char2, w) = r
for i in range(cast(int, char1), cast(int, char2) + 1):
widths[i] = w
r = []
return widths
def get_widths2(seq: Iterable[object]) -> Dict[int, Tuple[float, Point]]:
"""Build a mapping of character widths for vertical writing."""
widths: Dict[int, Tuple[float, Point]] = {}
r: List[float] = []
for v in seq:
if isinstance(v, list):
if r:
char1 = r[-1]
for i, (w, vx, vy) in enumerate(choplist(3, v)):
widths[cast(int, char1) + i] = (w, (vx, vy))
r = []
elif isinstance(v, (int, float)): # == utils.isnumber(v)
r.append(v)
if len(r) == 5:
(char1, char2, w, vx, vy) = r
for i in range(cast(int, char1), cast(int, char2) + 1):
widths[i] = (w, (vx, vy))
r = []
return widths
class FontMetricsDB:
@classmethod
def get_metrics(cls, fontname: str) -> Tuple[Dict[str, object], Dict[str, int]]:
return FONT_METRICS[fontname]
# int here means that we're not extending PSStackParser with additional types.
class Type1FontHeaderParser(PSStackParser[int]):
KEYWORD_BEGIN = KWD(b"begin")
KEYWORD_END = KWD(b"end")
KEYWORD_DEF = KWD(b"def")
KEYWORD_PUT = KWD(b"put")
KEYWORD_DICT = KWD(b"dict")
KEYWORD_ARRAY = KWD(b"array")
KEYWORD_READONLY = KWD(b"readonly")
KEYWORD_FOR = KWD(b"for")
def __init__(self, data: BinaryIO) -> None:
PSStackParser.__init__(self, data)
self._cid2unicode: Dict[int, str] = {}
def get_encoding(self) -> Dict[int, str]:
"""Parse the font encoding.
The Type1 font encoding maps character codes to character names. These
character names could either be standard Adobe glyph names, or
character names associated with custom CharStrings for this font. A
CharString is a sequence of operations that describe how the character
should be drawn. Currently, this function returns '' (empty string)
for character names that are associated with a CharStrings.
Reference: Adobe Systems Incorporated, Adobe Type 1 Font Format
:returns mapping of character identifiers (cid's) to unicode characters
"""
while 1:
try:
_, (cid, name) = self.nextobject()
except PSEOF:
break
try:
self._cid2unicode[cid] = name2unicode(cast(str, name))
except KeyError:
# log.debug(str(e))
pass
return self._cid2unicode
def do_keyword(self, pos: int, token: PSKeyword) -> None:
if token is self.KEYWORD_PUT:
((_, key), (_, value)) = self.pop(2)
if isinstance(key, int) and isinstance(value, PSLiteral):
self.add_results((key, literal_name(value)))
NIBBLES = ("0", "1", "2", "3", "4", "5", "6", "7", "8", "9", ".", "e", "e-", None, "-")
# Mapping of cmap names. Original cmap name is kept if not in the mapping.
# (missing reference for why DLIdent is mapped to Identity)
IDENTITY_ENCODER = {
"DLIdent-H": "Identity-H",
"DLIdent-V": "Identity-V",
}
def getdict(data: bytes) -> Dict[int, List[Union[float, int]]]:
d: Dict[int, List[Union[float, int]]] = {}
fp = BytesIO(data)
stack: List[Union[float, int]] = []
while 1:
c = fp.read(1)
if not c:
break
b0 = ord(c)
if b0 <= 21:
d[b0] = stack
stack = []
continue
if b0 == 30:
s = ""
loop = True
while loop:
b = ord(fp.read(1))
for n in (b >> 4, b & 15):
if n == 15:
loop = False
else:
nibble = NIBBLES[n]
assert nibble is not None
s += nibble
value = float(s)
elif b0 >= 32 and b0 <= 246:
value = b0 - 139
else:
b1 = ord(fp.read(1))
if b0 >= 247 and b0 <= 250:
value = ((b0 - 247) << 8) + b1 + 108
elif b0 >= 251 and b0 <= 254:
value = -((b0 - 251) << 8) - b1 - 108
else:
b2 = ord(fp.read(1))
if b1 >= 128:
b1 -= 256
if b0 == 28:
value = b1 << 8 | b2
else:
value = b1 << 24 | b2 << 16 | struct.unpack(">H", fp.read(2))[0]
stack.append(value)
return d
class CFFFont:
STANDARD_STRINGS = (
".notdef",
"space",
"exclam",
"quotedbl",
"numbersign",
"dollar",
"percent",
"ampersand",
"quoteright",
"parenleft",
"parenright",
"asterisk",
"plus",
"comma",
"hyphen",
"period",
"slash",
"zero",
"one",
"two",
"three",
"four",
"five",
"six",
"seven",
"eight",
"nine",
"colon",
"semicolon",
"less",
"equal",
"greater",
"question",
"at",
"A",
"B",
"C",
"D",
"E",
"F",
"G",
"H",
"I",
"J",
"K",
"L",
"M",
"N",
"O",
"P",
"Q",
"R",
"S",
"T",
"U",
"V",
"W",
"X",
"Y",
"Z",
"bracketleft",
"backslash",
"bracketright",
"asciicircum",
"underscore",
"quoteleft",
"a",
"b",
"c",
"d",
"e",
"f",
"g",
"h",
"i",
"j",
"k",
"l",
"m",
"n",
"o",
"p",
"q",
"r",
"s",
"t",
"u",
"v",
"w",
"x",
"y",
"z",
"braceleft",
"bar",
"braceright",
"asciitilde",
"exclamdown",
"cent",
"sterling",
"fraction",
"yen",
"florin",
"section",
"currency",
"quotesingle",
"quotedblleft",
"guillemotleft",
"guilsinglleft",
"guilsinglright",
"fi",
"fl",
"endash",
"dagger",
"daggerdbl",
"periodcentered",
"paragraph",
"bullet",
"quotesinglbase",
"quotedblbase",
"quotedblright",
"guillemotright",
"ellipsis",
"perthousand",
"questiondown",
"grave",
"acute",
"circumflex",
"tilde",
"macron",
"breve",
"dotaccent",
"dieresis",
"ring",
"cedilla",
"hungarumlaut",
"ogonek",
"caron",
"emdash",
"AE",
"ordfeminine",
"Lslash",
"Oslash",
"OE",
"ordmasculine",
"ae",
"dotlessi",
"lslash",
"oslash",
"oe",
"germandbls",
"onesuperior",
"logicalnot",
"mu",
"trademark",
"Eth",
"onehalf",
"plusminus",
"Thorn",
"onequarter",
"divide",
"brokenbar",
"degree",
"thorn",
"threequarters",
"twosuperior",
"registered",
"minus",
"eth",
"multiply",
"threesuperior",
"copyright",
"Aacute",
"Acircumflex",
"Adieresis",
"Agrave",
"Aring",
"Atilde",
"Ccedilla",
"Eacute",
"Ecircumflex",
"Edieresis",
"Egrave",
"Iacute",
"Icircumflex",
"Idieresis",
"Igrave",
"Ntilde",
"Oacute",
"Ocircumflex",
"Odieresis",
"Ograve",
"Otilde",
"Scaron",
"Uacute",
"Ucircumflex",
"Udieresis",
"Ugrave",
"Yacute",
"Ydieresis",
"Zcaron",
"aacute",
"acircumflex",
"adieresis",
"agrave",
"aring",
"atilde",
"ccedilla",
"eacute",
"ecircumflex",
"edieresis",
"egrave",
"iacute",
"icircumflex",
"idieresis",
"igrave",
"ntilde",
"oacute",
"ocircumflex",
"odieresis",
"ograve",
"otilde",
"scaron",
"uacute",
"ucircumflex",
"udieresis",
"ugrave",
"yacute",
"ydieresis",
"zcaron",
"exclamsmall",
"Hungarumlautsmall",
"dollaroldstyle",
"dollarsuperior",
"ampersandsmall",
"Acutesmall",
"parenleftsuperior",
"parenrightsuperior",
"twodotenleader",
"onedotenleader",
"zerooldstyle",
"oneoldstyle",
"twooldstyle",
"threeoldstyle",
"fouroldstyle",
"fiveoldstyle",
"sixoldstyle",
"sevenoldstyle",
"eightoldstyle",
"nineoldstyle",
"commasuperior",
"threequartersemdash",
"periodsuperior",
"questionsmall",
"asuperior",
"bsuperior",
"centsuperior",
"dsuperior",
"esuperior",
"isuperior",
"lsuperior",
"msuperior",
"nsuperior",
"osuperior",
"rsuperior",
"ssuperior",
"tsuperior",
"ff",
"ffi",
"ffl",
"parenleftinferior",
"parenrightinferior",
"Circumflexsmall",
"hyphensuperior",
"Gravesmall",
"Asmall",
"Bsmall",
"Csmall",
"Dsmall",
"Esmall",
"Fsmall",
"Gsmall",
"Hsmall",
"Ismall",
"Jsmall",
"Ksmall",
"Lsmall",
"Msmall",
"Nsmall",
"Osmall",
"Psmall",
"Qsmall",
"Rsmall",
"Ssmall",
"Tsmall",
"Usmall",
"Vsmall",
"Wsmall",
"Xsmall",
"Ysmall",
"Zsmall",
"colonmonetary",
"onefitted",
"rupiah",
"Tildesmall",
"exclamdownsmall",
"centoldstyle",
"Lslashsmall",
"Scaronsmall",
"Zcaronsmall",
"Dieresissmall",
"Brevesmall",
"Caronsmall",
"Dotaccentsmall",
"Macronsmall",
"figuredash",
"hypheninferior",
"Ogoneksmall",
"Ringsmall",
"Cedillasmall",
"questiondownsmall",
"oneeighth",
"threeeighths",
"fiveeighths",
"seveneighths",
"onethird",
"twothirds",
"zerosuperior",
"foursuperior",
"fivesuperior",
"sixsuperior",
"sevensuperior",
"eightsuperior",
"ninesuperior",
"zeroinferior",
"oneinferior",
"twoinferior",
"threeinferior",
"fourinferior",
"fiveinferior",
"sixinferior",
"seveninferior",
"eightinferior",
"nineinferior",
"centinferior",
"dollarinferior",
"periodinferior",
"commainferior",
"Agravesmall",
"Aacutesmall",
"Acircumflexsmall",
"Atildesmall",
"Adieresissmall",
"Aringsmall",
"AEsmall",
"Ccedillasmall",
"Egravesmall",
"Eacutesmall",
"Ecircumflexsmall",
"Edieresissmall",
"Igravesmall",
"Iacutesmall",
"Icircumflexsmall",
"Idieresissmall",
"Ethsmall",
"Ntildesmall",
"Ogravesmall",
"Oacutesmall",
"Ocircumflexsmall",
"Otildesmall",
"Odieresissmall",
"OEsmall",
"Oslashsmall",
"Ugravesmall",
"Uacutesmall",
"Ucircumflexsmall",
"Udieresissmall",
"Yacutesmall",
"Thornsmall",
"Ydieresissmall",
"001.000",
"001.001",
"001.002",
"001.003",
"Black",
"Bold",
"Book",
"Light",
"Medium",
"Regular",
"Roman",
"Semibold",
)
class INDEX:
def __init__(self, fp: BinaryIO) -> None:
self.fp = fp
self.offsets: List[int] = []
(count, offsize) = struct.unpack(">HB", self.fp.read(3))
for i in range(count + 1):
self.offsets.append(nunpack(self.fp.read(offsize)))
self.base = self.fp.tell() - 1
self.fp.seek(self.base + self.offsets[-1])
def __repr__(self) -> str:
return "<INDEX: size=%d>" % len(self)
def __len__(self) -> int:
return len(self.offsets) - 1
def __getitem__(self, i: int) -> bytes:
self.fp.seek(self.base + self.offsets[i])
return self.fp.read(self.offsets[i + 1] - self.offsets[i])
def __iter__(self) -> Iterator[bytes]:
return iter(self[i] for i in range(len(self)))
def __init__(self, name: str, fp: BinaryIO) -> None:
self.name = name
self.fp = fp
# Header
(_major, _minor, hdrsize, offsize) = struct.unpack("BBBB", self.fp.read(4))
self.fp.read(hdrsize - 4)
# Name INDEX
self.name_index = self.INDEX(self.fp)
# Top DICT INDEX
self.dict_index = self.INDEX(self.fp)
# String INDEX
self.string_index = self.INDEX(self.fp)
# Global Subr INDEX
self.subr_index = self.INDEX(self.fp)
# Top DICT DATA
self.top_dict = getdict(self.dict_index[0])
(charset_pos,) = self.top_dict.get(15, [0])
(encoding_pos,) = self.top_dict.get(16, [0])
(charstring_pos,) = self.top_dict.get(17, [0])
# CharStrings
self.fp.seek(cast(int, charstring_pos))
self.charstring = self.INDEX(self.fp)
self.nglyphs = len(self.charstring)
# Encodings
self.code2gid = {}
self.gid2code = {}
self.fp.seek(cast(int, encoding_pos))
format = self.fp.read(1)
if format == b"\x00":
# Format 0
(n,) = struct.unpack("B", self.fp.read(1))
for code, gid in enumerate(struct.unpack("B" * n, self.fp.read(n))):
self.code2gid[code] = gid
self.gid2code[gid] = code
elif format == b"\x01":
# Format 1
(n,) = struct.unpack("B", self.fp.read(1))
code = 0
for i in range(n):
(first, nleft) = struct.unpack("BB", self.fp.read(2))
for gid in range(first, first + nleft + 1):
self.code2gid[code] = gid
self.gid2code[gid] = code
code += 1
else:
raise PDFValueError("unsupported encoding format: %r" % format)
# Charsets
self.name2gid = {}
self.gid2name = {}
self.fp.seek(cast(int, charset_pos))
format = self.fp.read(1)
if format == b"\x00":
# Format 0
n = self.nglyphs - 1
for gid, sid in enumerate(
cast(
Tuple[int, ...], struct.unpack(">" + "H" * n, self.fp.read(2 * n))
),
):
gid += 1
sidname = self.getstr(sid)
self.name2gid[sidname] = gid
self.gid2name[gid] = sidname
elif format == b"\x01":
# Format 1
(n,) = struct.unpack("B", self.fp.read(1))
sid = 0
for i in range(n):
(first, nleft) = struct.unpack("BB", self.fp.read(2))
for gid in range(first, first + nleft + 1):
sidname = self.getstr(sid)
self.name2gid[sidname] = gid
self.gid2name[gid] = sidname
sid += 1
elif format == b"\x02":
# Format 2
assert False, str(("Unhandled", format))
else:
raise PDFValueError("unsupported charset format: %r" % format)
def getstr(self, sid: int) -> Union[str, bytes]:
# This returns str for one of the STANDARD_STRINGS but bytes otherwise,
# and appears to be a needless source of type complexity.
if sid < len(self.STANDARD_STRINGS):
return self.STANDARD_STRINGS[sid]
return self.string_index[sid - len(self.STANDARD_STRINGS)]
class TrueTypeFont:
class CMapNotFound(PDFException):
pass
def __init__(self, name: str, fp: BinaryIO) -> None:
self.name = name
self.fp = fp
self.tables: Dict[bytes, Tuple[int, int]] = {}
self.fonttype = fp.read(4)
try:
(ntables, _1, _2, _3) = cast(
Tuple[int, int, int, int],
struct.unpack(">HHHH", fp.read(8)),
)
for _ in range(ntables):
(name_bytes, tsum, offset, length) = cast(
Tuple[bytes, int, int, int],
struct.unpack(">4sLLL", fp.read(16)),
)
self.tables[name_bytes] = (offset, length)
except struct.error:
# Do not fail if there are not enough bytes to read. Even for
# corrupted PDFs we would like to get as much information as
# possible, so continue.
pass
def create_unicode_map(self) -> FileUnicodeMap:
if b"cmap" not in self.tables:
raise TrueTypeFont.CMapNotFound
(base_offset, length) = self.tables[b"cmap"]
fp = self.fp
fp.seek(base_offset)
(version, nsubtables) = cast(Tuple[int, int], struct.unpack(">HH", fp.read(4)))
subtables: List[Tuple[int, int, int]] = []
for i in range(nsubtables):
subtables.append(
cast(Tuple[int, int, int], struct.unpack(">HHL", fp.read(8))),
)
char2gid: Dict[int, int] = {}
# Only supports subtable type 0, 2 and 4.
for platform_id, encoding_id, st_offset in subtables:
# Skip non-Unicode cmaps.
# https://docs.microsoft.com/en-us/typography/opentype/spec/cmap
if not (platform_id == 0 or (platform_id == 3 and encoding_id in [1, 10])):
continue
fp.seek(base_offset + st_offset)
(fmttype, fmtlen, fmtlang) = cast(
Tuple[int, int, int],
struct.unpack(">HHH", fp.read(6)),
)
if fmttype == 0:
char2gid.update(
enumerate(
cast(Tuple[int, ...], struct.unpack(">256B", fp.read(256))),
),
)
elif fmttype == 2:
subheaderkeys = cast(
Tuple[int, ...],
struct.unpack(">256H", fp.read(512)),
)
firstbytes = [0] * 8192
for i, k in enumerate(subheaderkeys):
firstbytes[k // 8] = i
nhdrs = max(subheaderkeys) // 8 + 1
hdrs: List[Tuple[int, int, int, int, int]] = []
for i in range(nhdrs):
(firstcode, entcount, delta, offset) = cast(
Tuple[int, int, int, int],
struct.unpack(">HHhH", fp.read(8)),
)
hdrs.append((i, firstcode, entcount, delta, fp.tell() - 2 + offset))
for i, firstcode, entcount, delta, pos in hdrs:
if not entcount:
continue
first = firstcode + (firstbytes[i] << 8)
fp.seek(pos)
for c in range(entcount):
gid = cast(Tuple[int], struct.unpack(">H", fp.read(2)))[0]
if gid:
gid += delta
char2gid[first + c] = gid
elif fmttype == 4:
(segcount, _1, _2, _3) = cast(
Tuple[int, int, int, int],
struct.unpack(">HHHH", fp.read(8)),
)
segcount //= 2
ecs = cast(
Tuple[int, ...],
struct.unpack(">%dH" % segcount, fp.read(2 * segcount)),
)
fp.read(2)
scs = cast(
Tuple[int, ...],
struct.unpack(">%dH" % segcount, fp.read(2 * segcount)),
)
idds = cast(
Tuple[int, ...],
struct.unpack(">%dh" % segcount, fp.read(2 * segcount)),
)
pos = fp.tell()
idrs = cast(
Tuple[int, ...],
struct.unpack(">%dH" % segcount, fp.read(2 * segcount)),
)
for ec, sc, idd, idr in zip(ecs, scs, idds, idrs):
if idr:
fp.seek(pos + idr)
for c in range(sc, ec + 1):
b = cast(Tuple[int], struct.unpack(">H", fp.read(2)))[0]
char2gid[c] = (b + idd) & 0xFFFF
else:
for c in range(sc, ec + 1):
char2gid[c] = (c + idd) & 0xFFFF
else:
assert False, str(("Unhandled", fmttype))
if not char2gid:
raise TrueTypeFont.CMapNotFound
# create unicode map
unicode_map = FileUnicodeMap()
for char, gid in char2gid.items():
unicode_map.add_cid2unichr(gid, char)
return unicode_map
class PDFFontError(PDFException):
pass
class PDFUnicodeNotDefined(PDFFontError):
pass
LITERAL_STANDARD_ENCODING = LIT("StandardEncoding")
LITERAL_TYPE1C = LIT("Type1C")
# Font widths are maintained in a dict type that maps from *either* unicode
# chars or integer character IDs.
FontWidthDict = Union[Dict[int, float], Dict[str, float]]
class PDFFont:
def __init__(
self,
descriptor: Mapping[str, Any],
widths: FontWidthDict,
default_width: Optional[float] = None,
) -> None:
self.descriptor = descriptor
self.widths: FontWidthDict = resolve_all(widths)
self.fontname = resolve1(descriptor.get("FontName", "unknown"))
if isinstance(self.fontname, PSLiteral):
self.fontname = literal_name(self.fontname)
self.flags = int_value(descriptor.get("Flags", 0))
self.ascent = num_value(descriptor.get("Ascent", 0))
self.descent = num_value(descriptor.get("Descent", 0))
self.italic_angle = num_value(descriptor.get("ItalicAngle", 0))
if default_width is None:
self.default_width = num_value(descriptor.get("MissingWidth", 0))
else:
self.default_width = default_width
self.default_width = resolve1(self.default_width)
self.leading = num_value(descriptor.get("Leading", 0))
self.bbox = cast(
Rect,
list_value(resolve_all(descriptor.get("FontBBox", (0, 0, 0, 0)))),
)
self.hscale = self.vscale = 0.001
# PDF RM 9.8.1 specifies /Descent should always be a negative number.
# PScript5.dll seems to produce Descent with a positive number, but
# text analysis will be wrong if this is taken as correct. So force
# descent to negative.
if self.descent > 0:
self.descent = -self.descent
def __repr__(self) -> str:
return "<PDFFont>"
def is_vertical(self) -> bool:
return False
def is_multibyte(self) -> bool:
return False
def decode(self, bytes: bytes) -> Iterable[int]:
return bytearray(bytes) # map(ord, bytes)
def get_ascent(self) -> float:
"""Ascent above the baseline, in text space units"""
return self.ascent * self.vscale
def get_descent(self) -> float:
"""Descent below the baseline, in text space units; always negative"""
return self.descent * self.vscale
def get_width(self) -> float:
w = self.bbox[2] - self.bbox[0]
if w == 0:
w = -self.default_width
return w * self.hscale
def get_height(self) -> float:
h = self.bbox[3] - self.bbox[1]
if h == 0:
h = self.ascent - self.descent
return h * self.vscale
def char_width(self, cid: int) -> float:
# Because character widths may be mapping either IDs or strings,
# we try to lookup the character ID first, then its str equivalent.
try:
return cast(Dict[int, float], self.widths)[cid] * self.hscale
except KeyError:
str_widths = cast(Dict[str, float], self.widths)
try:
return str_widths[self.to_unichr(cid)] * self.hscale
except (KeyError, PDFUnicodeNotDefined):
return self.default_width * self.hscale
def char_disp(self, cid: int) -> Union[float, Tuple[Optional[float], float]]:
"""Returns an integer for horizontal fonts, a tuple for vertical fonts."""
return 0
def string_width(self, s: bytes) -> float:
return sum(self.char_width(cid) for cid in self.decode(s))
def to_unichr(self, cid: int) -> str:
raise NotImplementedError
class PDFSimpleFont(PDFFont):
def __init__(
self,
descriptor: Mapping[str, Any],
widths: FontWidthDict,
spec: Mapping[str, Any],
) -> None:
# Font encoding is specified either by a name of
# built-in encoding or a dictionary that describes
# the differences.
if "Encoding" in spec:
encoding = resolve1(spec["Encoding"])
else:
encoding = LITERAL_STANDARD_ENCODING
if isinstance(encoding, dict):
name = literal_name(encoding.get("BaseEncoding", LITERAL_STANDARD_ENCODING))
diff = list_value(encoding.get("Differences", []))
self.cid2unicode = EncodingDB.get_encoding(name, diff)
else:
self.cid2unicode = EncodingDB.get_encoding(literal_name(encoding))
self.unicode_map: Optional[UnicodeMap] = None
if "ToUnicode" in spec:
strm = stream_value(spec["ToUnicode"])
self.unicode_map = FileUnicodeMap()
CMapParser(self.unicode_map, BytesIO(strm.get_data())).run()
PDFFont.__init__(self, descriptor, widths)
def to_unichr(self, cid: int) -> str:
if self.unicode_map:
try:
return self.unicode_map.get_unichr(cid)
except KeyError:
pass
try:
return self.cid2unicode[cid]
except KeyError:
raise PDFUnicodeNotDefined(None, cid)
class PDFType1Font(PDFSimpleFont):
def __init__(self, rsrcmgr: "PDFResourceManager", spec: Mapping[str, Any]) -> None:
try:
self.basefont = literal_name(spec["BaseFont"])
except KeyError:
if settings.STRICT:
raise PDFFontError("BaseFont is missing")
self.basefont = "unknown"
widths: FontWidthDict
try:
(descriptor, int_widths) = FontMetricsDB.get_metrics(self.basefont)
widths = cast(Dict[str, float], int_widths) # implicit int->float
except KeyError:
descriptor = dict_value(spec.get("FontDescriptor", {}))
firstchar = int_value(spec.get("FirstChar", 0))
# lastchar = int_value(spec.get('LastChar', 255))
width_list = list_value(spec.get("Widths", [0] * 256))
widths = {i + firstchar: resolve1(w) for (i, w) in enumerate(width_list)}
PDFSimpleFont.__init__(self, descriptor, widths, spec)
if "Encoding" not in spec and "FontFile" in descriptor:
# try to recover the missing encoding info from the font file.
self.fontfile = stream_value(descriptor.get("FontFile"))
length1 = int_value(self.fontfile["Length1"])
data = self.fontfile.get_data()[:length1]
parser = Type1FontHeaderParser(BytesIO(data))
self.cid2unicode = parser.get_encoding()
def __repr__(self) -> str:
return "<PDFType1Font: basefont=%r>" % self.basefont
class PDFTrueTypeFont(PDFType1Font):
def __repr__(self) -> str:
return "<PDFTrueTypeFont: basefont=%r>" % self.basefont
class PDFType3Font(PDFSimpleFont):
def __init__(self, rsrcmgr: "PDFResourceManager", spec: Mapping[str, Any]) -> None:
firstchar = int_value(spec.get("FirstChar", 0))
# lastchar = int_value(spec.get('LastChar', 0))
width_list = list_value(spec.get("Widths", [0] * 256))
widths = {i + firstchar: w for (i, w) in enumerate(width_list)}
if "FontDescriptor" in spec:
descriptor = dict_value(spec["FontDescriptor"])
else:
descriptor = {"Ascent": 0, "Descent": 0, "FontBBox": spec["FontBBox"]}
PDFSimpleFont.__init__(self, descriptor, widths, spec)
self.matrix = cast(Matrix, tuple(list_value(spec.get("FontMatrix"))))
(_, self.descent, _, self.ascent) = self.bbox
(self.hscale, self.vscale) = apply_matrix_norm(self.matrix, (1, 1))
def __repr__(self) -> str:
return "<PDFType3Font>"
class PDFCIDFont(PDFFont):
default_disp: Union[float, Tuple[Optional[float], float]]
def __init__(
self,
rsrcmgr: "PDFResourceManager",
spec: Mapping[str, Any],
strict: bool = settings.STRICT,
) -> None:
try:
self.basefont = literal_name(spec["BaseFont"])
except KeyError:
if strict:
raise PDFFontError("BaseFont is missing")
self.basefont = "unknown"
self.cidsysteminfo = dict_value(spec.get("CIDSystemInfo", {}))
cid_registry = resolve1(self.cidsysteminfo.get("Registry", b"unknown")).decode(
"latin1",
)
cid_ordering = resolve1(self.cidsysteminfo.get("Ordering", b"unknown")).decode(
"latin1",
)
self.cidcoding = f"{cid_registry.strip()}-{cid_ordering.strip()}"
self.cmap: CMapBase = self.get_cmap_from_spec(spec, strict)
try:
descriptor = dict_value(spec["FontDescriptor"])
except KeyError:
if strict:
raise PDFFontError("FontDescriptor is missing")
descriptor = {}
ttf = None
if "FontFile2" in descriptor:
self.fontfile = stream_value(descriptor.get("FontFile2"))
ttf = TrueTypeFont(self.basefont, BytesIO(self.fontfile.get_data()))
self.unicode_map: Optional[UnicodeMap] = None
if "ToUnicode" in spec:
if isinstance(spec["ToUnicode"], PDFStream):
strm = stream_value(spec["ToUnicode"])
self.unicode_map = FileUnicodeMap()
CMapParser(self.unicode_map, BytesIO(strm.get_data())).run()
else:
cmap_name = literal_name(spec["ToUnicode"])
encoding = literal_name(spec["Encoding"])
if (
"Identity" in cid_ordering
or "Identity" in cmap_name
or "Identity" in encoding
):
self.unicode_map = IdentityUnicodeMap()
elif self.cidcoding in ("Adobe-Identity", "Adobe-UCS"):
if ttf:
try:
self.unicode_map = ttf.create_unicode_map()
except TrueTypeFont.CMapNotFound:
pass
else:
try:
self.unicode_map = CMapDB.get_unicode_map(
self.cidcoding,
self.cmap.is_vertical(),
)
except CMapDB.CMapNotFound:
pass
self.vertical = self.cmap.is_vertical()
if self.vertical:
# writing mode: vertical
widths2 = get_widths2(list_value(spec.get("W2", [])))
self.disps = {cid: (vx, vy) for (cid, (_, (vx, vy))) in widths2.items()}
(vy, w) = resolve1(spec.get("DW2", [880, -1000]))
self.default_disp = (None, vy)
widths = {cid: w for (cid, (w, _)) in widths2.items()}
default_width = w
else:
# writing mode: horizontal
self.disps = {}
self.default_disp = 0
widths = get_widths(list_value(spec.get("W", [])))
default_width = spec.get("DW", 1000)
PDFFont.__init__(self, descriptor, widths, default_width=default_width)
def get_cmap_from_spec(self, spec: Mapping[str, Any], strict: bool) -> CMapBase:
"""Get cmap from font specification
For certain PDFs, Encoding Type isn't mentioned as an attribute of
Encoding but as an attribute of CMapName, where CMapName is an
attribute of spec['Encoding'].
The horizontal/vertical modes are mentioned with different name
such as 'DLIdent-H/V','OneByteIdentityH/V','Identity-H/V'.
"""
cmap_name = self._get_cmap_name(spec, strict)
try:
return CMapDB.get_cmap(cmap_name)
except CMapDB.CMapNotFound as e:
if strict:
raise PDFFontError(e)
return CMap()
@staticmethod
def _get_cmap_name(spec: Mapping[str, Any], strict: bool) -> str:
"""Get cmap name from font specification"""
cmap_name = "unknown" # default value
try:
spec_encoding = spec["Encoding"]
if hasattr(spec_encoding, "name"):
cmap_name = literal_name(spec["Encoding"])
else:
cmap_name = literal_name(spec_encoding["CMapName"])
except KeyError:
if strict:
raise PDFFontError("Encoding is unspecified")
if type(cmap_name) is PDFStream: # type: ignore[comparison-overlap]
cmap_name_stream: PDFStream = cast(PDFStream, cmap_name)
if "CMapName" in cmap_name_stream:
cmap_name = cmap_name_stream.get("CMapName").name
elif strict:
raise PDFFontError("CMapName unspecified for encoding")
return IDENTITY_ENCODER.get(cmap_name, cmap_name)
def __repr__(self) -> str:
return f"<PDFCIDFont: basefont={self.basefont!r}, cidcoding={self.cidcoding!r}>"
def is_vertical(self) -> bool:
return self.vertical
def is_multibyte(self) -> bool:
return True
def decode(self, bytes: bytes) -> Iterable[int]:
return self.cmap.decode(bytes)
def char_disp(self, cid: int) -> Union[float, Tuple[Optional[float], float]]:
"""Returns an integer for horizontal fonts, a tuple for vertical fonts."""
return self.disps.get(cid, self.default_disp)
def to_unichr(self, cid: int) -> str:
try:
if not self.unicode_map:
raise PDFKeyError(cid)
return self.unicode_map.get_unichr(cid)
except KeyError:
raise PDFUnicodeNotDefined(self.cidcoding, cid)
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