746 lines
27 KiB
Python
746 lines
27 KiB
Python
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import sys
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import struct
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from io import BytesIO
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from .cmapdb import CMapDB
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from .cmapdb import CMapParser
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from .cmapdb import FileUnicodeMap
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from .cmapdb import CMap
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from .encodingdb import EncodingDB
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from .encodingdb import name2unicode
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from .psparser import PSStackParser
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from .psparser import PSEOF
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from .psparser import LIT
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from .psparser import KWD
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from . import settings
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from .psparser import PSLiteral
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from .psparser import literal_name
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from .pdftypes import PDFException
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from .pdftypes import resolve1
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from .pdftypes import int_value
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from .pdftypes import num_value
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from .pdftypes import list_value
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from .pdftypes import dict_value
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from .pdftypes import stream_value
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from .fontmetrics import FONT_METRICS
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from .utils import apply_matrix_norm
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from .utils import nunpack
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from .utils import choplist
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from .utils import isnumber
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import six #Python 2+3 compatibility
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def get_widths(seq):
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widths = {}
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r = []
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for v in seq:
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if isinstance(v, list):
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if r:
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char1 = r[-1]
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for (i, w) in enumerate(v):
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widths[char1+i] = w
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r = []
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elif isnumber(v):
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r.append(v)
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if len(r) == 3:
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(char1, char2, w) = r
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for i in range(char1, char2+1):
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widths[i] = w
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r = []
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return widths
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#assert get_widths([1]) == {}
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#assert get_widths([1,2,3]) == {1:3, 2:3}
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#assert get_widths([1,[2,3],6,[7,8]]) == {1:2,2:3, 6:7,7:8}
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def get_widths2(seq):
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widths = {}
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r = []
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for v in seq:
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if isinstance(v, list):
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if r:
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char1 = r[-1]
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for (i, (w, vx, vy)) in enumerate(choplist(3, v)):
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widths[char1+i] = (w, (vx, vy))
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r = []
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elif isnumber(v):
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r.append(v)
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if len(r) == 5:
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(char1, char2, w, vx, vy) = r
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for i in range(char1, char2+1):
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widths[i] = (w, (vx, vy))
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r = []
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return widths
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#assert get_widths2([1]) == {}
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#assert get_widths2([1,2,3,4,5]) == {1:(3, (4,5)), 2:(3, (4,5))}
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#assert get_widths2([1,[2,3,4,5],6,[7,8,9]]) == {1:(2, (3,4)), 6:(7, (8,9))}
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## FontMetricsDB
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##
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class FontMetricsDB(object):
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@classmethod
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def get_metrics(klass, fontname):
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return FONT_METRICS[fontname]
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## Type1FontHeaderParser
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##
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class Type1FontHeaderParser(PSStackParser):
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KEYWORD_BEGIN = KWD(b'begin')
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KEYWORD_END = KWD(b'end')
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KEYWORD_DEF = KWD(b'def')
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KEYWORD_PUT = KWD(b'put')
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KEYWORD_DICT = KWD(b'dict')
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KEYWORD_ARRAY = KWD(b'array')
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KEYWORD_READONLY = KWD(b'readonly')
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KEYWORD_FOR = KWD(b'for')
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KEYWORD_FOR = KWD(b'for')
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def __init__(self, data):
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PSStackParser.__init__(self, data)
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self._cid2unicode = {}
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return
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def get_encoding(self):
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while 1:
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try:
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(cid, name) = self.nextobject()
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except PSEOF:
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break
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try:
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self._cid2unicode[cid] = name2unicode(name)
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except KeyError:
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pass
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return self._cid2unicode
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def do_keyword(self, pos, token):
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if token is self.KEYWORD_PUT:
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((_, key), (_, value)) = self.pop(2)
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if (isinstance(key, int) and
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isinstance(value, PSLiteral)):
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self.add_results((key, literal_name(value)))
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return
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NIBBLES = ('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '.', 'e', 'e-', None, '-')
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## CFFFont
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## (Format specified in Adobe Technical Note: #5176
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## "The Compact Font Format Specification")
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##
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def getdict(data):
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d = {}
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fp = BytesIO(data)
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stack = []
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while 1:
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c = fp.read(1)
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if not c:
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break
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b0 = ord(c)
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if b0 <= 21:
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d[b0] = stack
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stack = []
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continue
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if b0 == 30:
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s = ''
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loop = True
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while loop:
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b = ord(fp.read(1))
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for n in (b >> 4, b & 15):
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if n == 15:
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loop = False
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else:
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s += NIBBLES[n]
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value = float(s)
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elif 32 <= b0 and b0 <= 246:
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value = b0-139
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else:
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b1 = ord(fp.read(1))
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if 247 <= b0 and b0 <= 250:
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value = ((b0-247) << 8)+b1+108
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elif 251 <= b0 and b0 <= 254:
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value = -((b0-251) << 8)-b1-108
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else:
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b2 = ord(fp.read(1))
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if 128 <= b1:
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b1 -= 256
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if b0 == 28:
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value = b1 << 8 | b2
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else:
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value = b1 << 24 | b2 << 16 | struct.unpack('>H', fp.read(2))[0]
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stack.append(value)
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return d
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class CFFFont(object):
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STANDARD_STRINGS = (
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'.notdef', 'space', 'exclam', 'quotedbl', 'numbersign',
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'dollar', 'percent', 'ampersand', 'quoteright', 'parenleft',
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'parenright', 'asterisk', 'plus', 'comma', 'hyphen', 'period',
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'slash', 'zero', 'one', 'two', 'three', 'four', 'five', 'six',
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'seven', 'eight', 'nine', 'colon', 'semicolon', 'less', 'equal',
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'greater', 'question', 'at', 'A', 'B', 'C', 'D', 'E', 'F', 'G',
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'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
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'U', 'V', 'W', 'X', 'Y', 'Z', 'bracketleft', 'backslash',
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'bracketright', 'asciicircum', 'underscore', 'quoteleft', 'a',
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'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
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'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
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'braceleft', 'bar', 'braceright', 'asciitilde', 'exclamdown',
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'cent', 'sterling', 'fraction', 'yen', 'florin', 'section',
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'currency', 'quotesingle', 'quotedblleft', 'guillemotleft',
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'guilsinglleft', 'guilsinglright', 'fi', 'fl', 'endash',
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'dagger', 'daggerdbl', 'periodcentered', 'paragraph', 'bullet',
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'quotesinglbase', 'quotedblbase', 'quotedblright',
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'guillemotright', 'ellipsis', 'perthousand', 'questiondown',
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'grave', 'acute', 'circumflex', 'tilde', 'macron', 'breve',
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'dotaccent', 'dieresis', 'ring', 'cedilla', 'hungarumlaut',
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'ogonek', 'caron', 'emdash', 'AE', 'ordfeminine', 'Lslash',
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'Oslash', 'OE', 'ordmasculine', 'ae', 'dotlessi', 'lslash',
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'oslash', 'oe', 'germandbls', 'onesuperior', 'logicalnot', 'mu',
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'trademark', 'Eth', 'onehalf', 'plusminus', 'Thorn',
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'onequarter', 'divide', 'brokenbar', 'degree', 'thorn',
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'threequarters', 'twosuperior', 'registered', 'minus', 'eth',
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'multiply', 'threesuperior', 'copyright', 'Aacute',
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'Acircumflex', 'Adieresis', 'Agrave', 'Aring', 'Atilde',
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'Ccedilla', 'Eacute', 'Ecircumflex', 'Edieresis', 'Egrave',
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'Iacute', 'Icircumflex', 'Idieresis', 'Igrave', 'Ntilde',
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'Oacute', 'Ocircumflex', 'Odieresis', 'Ograve', 'Otilde',
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'Scaron', 'Uacute', 'Ucircumflex', 'Udieresis', 'Ugrave',
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'Yacute', 'Ydieresis', 'Zcaron', 'aacute', 'acircumflex',
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'adieresis', 'agrave', 'aring', 'atilde', 'ccedilla', 'eacute',
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'ecircumflex', 'edieresis', 'egrave', 'iacute', 'icircumflex',
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'idieresis', 'igrave', 'ntilde', 'oacute', 'ocircumflex',
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'odieresis', 'ograve', 'otilde', 'scaron', 'uacute',
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'ucircumflex', 'udieresis', 'ugrave', 'yacute', 'ydieresis',
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'zcaron', 'exclamsmall', 'Hungarumlautsmall', 'dollaroldstyle',
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'dollarsuperior', 'ampersandsmall', 'Acutesmall',
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'parenleftsuperior', 'parenrightsuperior', 'twodotenleader',
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'onedotenleader', 'zerooldstyle', 'oneoldstyle', 'twooldstyle',
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'threeoldstyle', 'fouroldstyle', 'fiveoldstyle', 'sixoldstyle',
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'sevenoldstyle', 'eightoldstyle', 'nineoldstyle',
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'commasuperior', 'threequartersemdash', 'periodsuperior',
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'questionsmall', 'asuperior', 'bsuperior', 'centsuperior',
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'dsuperior', 'esuperior', 'isuperior', 'lsuperior', 'msuperior',
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'nsuperior', 'osuperior', 'rsuperior', 'ssuperior', 'tsuperior',
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'ff', 'ffi', 'ffl', 'parenleftinferior', 'parenrightinferior',
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'Circumflexsmall', 'hyphensuperior', 'Gravesmall', 'Asmall',
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'Bsmall', 'Csmall', 'Dsmall', 'Esmall', 'Fsmall', 'Gsmall',
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'Hsmall', 'Ismall', 'Jsmall', 'Ksmall', 'Lsmall', 'Msmall',
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'Nsmall', 'Osmall', 'Psmall', 'Qsmall', 'Rsmall', 'Ssmall',
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'Tsmall', 'Usmall', 'Vsmall', 'Wsmall', 'Xsmall', 'Ysmall',
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'Zsmall', 'colonmonetary', 'onefitted', 'rupiah', 'Tildesmall',
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'exclamdownsmall', 'centoldstyle', 'Lslashsmall', 'Scaronsmall',
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'Zcaronsmall', 'Dieresissmall', 'Brevesmall', 'Caronsmall',
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'Dotaccentsmall', 'Macronsmall', 'figuredash', 'hypheninferior',
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'Ogoneksmall', 'Ringsmall', 'Cedillasmall', 'questiondownsmall',
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'oneeighth', 'threeeighths', 'fiveeighths', 'seveneighths',
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'onethird', 'twothirds', 'zerosuperior', 'foursuperior',
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'fivesuperior', 'sixsuperior', 'sevensuperior', 'eightsuperior',
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'ninesuperior', 'zeroinferior', 'oneinferior', 'twoinferior',
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'threeinferior', 'fourinferior', 'fiveinferior', 'sixinferior',
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'seveninferior', 'eightinferior', 'nineinferior',
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'centinferior', 'dollarinferior', 'periodinferior',
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'commainferior', 'Agravesmall', 'Aacutesmall',
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'Acircumflexsmall', 'Atildesmall', 'Adieresissmall',
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'Aringsmall', 'AEsmall', 'Ccedillasmall', 'Egravesmall',
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'Eacutesmall', 'Ecircumflexsmall', 'Edieresissmall',
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'Igravesmall', 'Iacutesmall', 'Icircumflexsmall',
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'Idieresissmall', 'Ethsmall', 'Ntildesmall', 'Ogravesmall',
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'Oacutesmall', 'Ocircumflexsmall', 'Otildesmall',
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'Odieresissmall', 'OEsmall', 'Oslashsmall', 'Ugravesmall',
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'Uacutesmall', 'Ucircumflexsmall', 'Udieresissmall',
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'Yacutesmall', 'Thornsmall', 'Ydieresissmall', '001.000',
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'001.001', '001.002', '001.003', 'Black', 'Bold', 'Book',
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'Light', 'Medium', 'Regular', 'Roman', 'Semibold',
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)
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class INDEX(object):
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def __init__(self, fp):
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self.fp = fp
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self.offsets = []
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(count, offsize) = struct.unpack('>HB', self.fp.read(3))
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for i in range(count+1):
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self.offsets.append(nunpack(self.fp.read(offsize)))
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self.base = self.fp.tell()-1
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self.fp.seek(self.base+self.offsets[-1])
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return
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def __repr__(self):
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return '<INDEX: size=%d>' % len(self)
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def __len__(self):
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return len(self.offsets)-1
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def __getitem__(self, i):
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self.fp.seek(self.base+self.offsets[i])
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return self.fp.read(self.offsets[i+1]-self.offsets[i])
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|
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def __iter__(self):
|
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return iter(self[i] for i in range(len(self)))
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def __init__(self, name, fp):
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self.name = name
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self.fp = fp
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# Header
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(_major, _minor, hdrsize, offsize) = struct.unpack('BBBB', self.fp.read(4))
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self.fp.read(hdrsize-4)
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# Name INDEX
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self.name_index = self.INDEX(self.fp)
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# Top DICT INDEX
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||
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self.dict_index = self.INDEX(self.fp)
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# String INDEX
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self.string_index = self.INDEX(self.fp)
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# Global Subr INDEX
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||
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self.subr_index = self.INDEX(self.fp)
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# Top DICT DATA
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self.top_dict = getdict(self.dict_index[0])
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(charset_pos,) = self.top_dict.get(15, [0])
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||
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(encoding_pos,) = self.top_dict.get(16, [0])
|
||
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(charstring_pos,) = self.top_dict.get(17, [0])
|
||
|
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# CharStrings
|
||
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self.fp.seek(charstring_pos)
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||
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self.charstring = self.INDEX(self.fp)
|
||
|
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self.nglyphs = len(self.charstring)
|
||
|
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# Encodings
|
||
|
|
self.code2gid = {}
|
||
|
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self.gid2code = {}
|
||
|
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self.fp.seek(encoding_pos)
|
||
|
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format = self.fp.read(1)
|
||
|
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if format == b'\x00':
|
||
|
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# Format 0
|
||
|
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(n,) = struct.unpack('B', self.fp.read(1))
|
||
|
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for (code, gid) in enumerate(struct.unpack('B'*n, self.fp.read(n))):
|
||
|
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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 ValueError('unsupported encoding format: %r' % format)
|
||
|
|
# Charsets
|
||
|
|
self.name2gid = {}
|
||
|
|
self.gid2name = {}
|
||
|
|
self.fp.seek(charset_pos)
|
||
|
|
format = self.fp.read(1)
|
||
|
|
if format == b'\x00':
|
||
|
|
# Format 0
|
||
|
|
n = self.nglyphs-1
|
||
|
|
for (gid, sid) in enumerate(struct.unpack('>'+'H'*n, self.fp.read(2*n))):
|
||
|
|
gid += 1
|
||
|
|
name = self.getstr(sid)
|
||
|
|
self.name2gid[name] = gid
|
||
|
|
self.gid2name[gid] = name
|
||
|
|
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):
|
||
|
|
name = self.getstr(sid)
|
||
|
|
self.name2gid[name] = gid
|
||
|
|
self.gid2name[gid] = name
|
||
|
|
sid += 1
|
||
|
|
elif format == b'\x02':
|
||
|
|
# Format 2
|
||
|
|
assert False, str(('Unhandled', format))
|
||
|
|
else:
|
||
|
|
raise ValueError('unsupported charset format: %r' % format)
|
||
|
|
#print self.code2gid
|
||
|
|
#print self.name2gid
|
||
|
|
#assert 0
|
||
|
|
return
|
||
|
|
|
||
|
|
def getstr(self, sid):
|
||
|
|
if sid < len(self.STANDARD_STRINGS):
|
||
|
|
return self.STANDARD_STRINGS[sid]
|
||
|
|
return self.string_index[sid-len(self.STANDARD_STRINGS)]
|
||
|
|
|
||
|
|
|
||
|
|
## TrueTypeFont
|
||
|
|
##
|
||
|
|
class TrueTypeFont(object):
|
||
|
|
|
||
|
|
class CMapNotFound(Exception):
|
||
|
|
pass
|
||
|
|
|
||
|
|
def __init__(self, name, fp):
|
||
|
|
self.name = name
|
||
|
|
self.fp = fp
|
||
|
|
self.tables = {}
|
||
|
|
self.fonttype = fp.read(4)
|
||
|
|
try:
|
||
|
|
(ntables, _1, _2, _3) = struct.unpack('>HHHH', fp.read(8))
|
||
|
|
for _ in range(ntables):
|
||
|
|
(name, tsum, offset, length) = struct.unpack('>4sLLL', fp.read(16))
|
||
|
|
self.tables[name] = (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
|
||
|
|
return
|
||
|
|
|
||
|
|
def create_unicode_map(self):
|
||
|
|
if 'cmap' not in self.tables:
|
||
|
|
raise TrueTypeFont.CMapNotFound
|
||
|
|
(base_offset, length) = self.tables['cmap']
|
||
|
|
fp = self.fp
|
||
|
|
fp.seek(base_offset)
|
||
|
|
(version, nsubtables) = struct.unpack('>HH', fp.read(4))
|
||
|
|
subtables = []
|
||
|
|
for i in range(nsubtables):
|
||
|
|
subtables.append(struct.unpack('>HHL', fp.read(8)))
|
||
|
|
char2gid = {}
|
||
|
|
# Only supports subtable type 0, 2 and 4.
|
||
|
|
for (_1, _2, st_offset) in subtables:
|
||
|
|
fp.seek(base_offset+st_offset)
|
||
|
|
(fmttype, fmtlen, fmtlang) = struct.unpack('>HHH', fp.read(6))
|
||
|
|
if fmttype == 0:
|
||
|
|
char2gid.update(enumerate(struct.unpack('>256B', fp.read(256))))
|
||
|
|
elif fmttype == 2:
|
||
|
|
subheaderkeys = 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 = []
|
||
|
|
for i in range(nhdrs):
|
||
|
|
(firstcode, entcount, delta, offset) = 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 = struct.unpack('>H', fp.read(2))
|
||
|
|
if gid:
|
||
|
|
gid += delta
|
||
|
|
char2gid[first+c] = gid
|
||
|
|
elif fmttype == 4:
|
||
|
|
(segcount, _1, _2, _3) = struct.unpack('>HHHH', fp.read(8))
|
||
|
|
segcount //= 2
|
||
|
|
ecs = struct.unpack('>%dH' % segcount, fp.read(2*segcount))
|
||
|
|
fp.read(2)
|
||
|
|
scs = struct.unpack('>%dH' % segcount, fp.read(2*segcount))
|
||
|
|
idds = struct.unpack('>%dh' % segcount, fp.read(2*segcount))
|
||
|
|
pos = fp.tell()
|
||
|
|
idrs = 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):
|
||
|
|
char2gid[c] = (struct.unpack('>H', fp.read(2))[0] + idd) & 0xffff
|
||
|
|
else:
|
||
|
|
for c in range(sc, ec+1):
|
||
|
|
char2gid[c] = (c + idd) & 0xffff
|
||
|
|
else:
|
||
|
|
assert False, str(('Unhandled', fmttype))
|
||
|
|
# create unicode map
|
||
|
|
unicode_map = FileUnicodeMap()
|
||
|
|
for (char, gid) in char2gid.iteritems():
|
||
|
|
unicode_map.add_cid2unichr(gid, char)
|
||
|
|
return unicode_map
|
||
|
|
|
||
|
|
|
||
|
|
## Fonts
|
||
|
|
##
|
||
|
|
class PDFFontError(PDFException):
|
||
|
|
pass
|
||
|
|
|
||
|
|
|
||
|
|
class PDFUnicodeNotDefined(PDFFontError):
|
||
|
|
pass
|
||
|
|
|
||
|
|
LITERAL_STANDARD_ENCODING = LIT('StandardEncoding')
|
||
|
|
LITERAL_TYPE1C = LIT('Type1C')
|
||
|
|
|
||
|
|
|
||
|
|
# PDFFont
|
||
|
|
class PDFFont(object):
|
||
|
|
|
||
|
|
def __init__(self, descriptor, widths, default_width=None):
|
||
|
|
self.descriptor = descriptor
|
||
|
|
self.widths = 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))
|
||
|
|
self.default_width = default_width or num_value(descriptor.get('MissingWidth', 0))
|
||
|
|
self.leading = num_value(descriptor.get('Leading', 0))
|
||
|
|
self.bbox = list_value(descriptor.get('FontBBox', (0, 0, 0, 0)))
|
||
|
|
self.hscale = self.vscale = .001
|
||
|
|
return
|
||
|
|
|
||
|
|
def __repr__(self):
|
||
|
|
return '<PDFFont>'
|
||
|
|
|
||
|
|
def is_vertical(self):
|
||
|
|
return False
|
||
|
|
|
||
|
|
def is_multibyte(self):
|
||
|
|
return False
|
||
|
|
|
||
|
|
def decode(self, bytes):
|
||
|
|
return bytearray(bytes) # map(ord, bytes)
|
||
|
|
|
||
|
|
def get_ascent(self):
|
||
|
|
return self.ascent * self.vscale
|
||
|
|
|
||
|
|
def get_descent(self):
|
||
|
|
return self.descent * self.vscale
|
||
|
|
|
||
|
|
def get_width(self):
|
||
|
|
w = self.bbox[2]-self.bbox[0]
|
||
|
|
if w == 0:
|
||
|
|
w = -self.default_width
|
||
|
|
return w * self.hscale
|
||
|
|
|
||
|
|
def get_height(self):
|
||
|
|
h = self.bbox[3]-self.bbox[1]
|
||
|
|
if h == 0:
|
||
|
|
h = self.ascent - self.descent
|
||
|
|
return h * self.vscale
|
||
|
|
|
||
|
|
def char_width(self, cid):
|
||
|
|
try:
|
||
|
|
return self.widths[cid] * self.hscale
|
||
|
|
except KeyError:
|
||
|
|
try:
|
||
|
|
return self.widths[self.to_unichr(cid)] * self.hscale
|
||
|
|
except (KeyError, PDFUnicodeNotDefined):
|
||
|
|
return self.default_width * self.hscale
|
||
|
|
|
||
|
|
def char_disp(self, cid):
|
||
|
|
return 0
|
||
|
|
|
||
|
|
def string_width(self, s):
|
||
|
|
return sum(self.char_width(cid) for cid in self.decode(s))
|
||
|
|
|
||
|
|
|
||
|
|
# PDFSimpleFont
|
||
|
|
class PDFSimpleFont(PDFFont):
|
||
|
|
|
||
|
|
def __init__(self, descriptor, widths, spec):
|
||
|
|
# 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 = 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)
|
||
|
|
return
|
||
|
|
|
||
|
|
def to_unichr(self, cid):
|
||
|
|
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)
|
||
|
|
|
||
|
|
|
||
|
|
# PDFType1Font
|
||
|
|
class PDFType1Font(PDFSimpleFont):
|
||
|
|
|
||
|
|
def __init__(self, rsrcmgr, spec):
|
||
|
|
try:
|
||
|
|
self.basefont = literal_name(spec['BaseFont'])
|
||
|
|
except KeyError:
|
||
|
|
if settings.STRICT:
|
||
|
|
raise PDFFontError('BaseFont is missing')
|
||
|
|
self.basefont = 'unknown'
|
||
|
|
try:
|
||
|
|
(descriptor, widths) = FontMetricsDB.get_metrics(self.basefont)
|
||
|
|
except KeyError:
|
||
|
|
descriptor = dict_value(spec.get('FontDescriptor', {}))
|
||
|
|
firstchar = int_value(spec.get('FirstChar', 0))
|
||
|
|
#lastchar = int_value(spec.get('LastChar', 255))
|
||
|
|
widths = list_value(spec.get('Widths', [0]*256))
|
||
|
|
widths = dict((i+firstchar, w) for (i, w) in enumerate(widths))
|
||
|
|
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()
|
||
|
|
return
|
||
|
|
|
||
|
|
def __repr__(self):
|
||
|
|
return '<PDFType1Font: basefont=%r>' % self.basefont
|
||
|
|
|
||
|
|
|
||
|
|
# PDFTrueTypeFont
|
||
|
|
class PDFTrueTypeFont(PDFType1Font):
|
||
|
|
|
||
|
|
def __repr__(self):
|
||
|
|
return '<PDFTrueTypeFont: basefont=%r>' % self.basefont
|
||
|
|
|
||
|
|
|
||
|
|
# PDFType3Font
|
||
|
|
class PDFType3Font(PDFSimpleFont):
|
||
|
|
|
||
|
|
def __init__(self, rsrcmgr, spec):
|
||
|
|
firstchar = int_value(spec.get('FirstChar', 0))
|
||
|
|
#lastchar = int_value(spec.get('LastChar', 0))
|
||
|
|
widths = list_value(spec.get('Widths', [0]*256))
|
||
|
|
widths = dict((i+firstchar, w) for (i, w) in enumerate(widths))
|
||
|
|
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 = tuple(list_value(spec.get('FontMatrix')))
|
||
|
|
(_, self.descent, _, self.ascent) = self.bbox
|
||
|
|
(self.hscale, self.vscale) = apply_matrix_norm(self.matrix, (1, 1))
|
||
|
|
return
|
||
|
|
|
||
|
|
def __repr__(self):
|
||
|
|
return '<PDFType3Font>'
|
||
|
|
|
||
|
|
|
||
|
|
# PDFCIDFont
|
||
|
|
class PDFCIDFont(PDFFont):
|
||
|
|
|
||
|
|
def __init__(self, rsrcmgr, spec, strict=settings.STRICT):
|
||
|
|
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', {}))
|
||
|
|
self.cidcoding = '%s-%s' % (resolve1(self.cidsysteminfo.get('Registry', b'unknown')).decode("latin1"),
|
||
|
|
resolve1(self.cidsysteminfo.get('Ordering', b'unknown')).decode("latin1"))
|
||
|
|
try:
|
||
|
|
name = literal_name(spec['Encoding'])
|
||
|
|
except KeyError:
|
||
|
|
if strict:
|
||
|
|
raise PDFFontError('Encoding is unspecified')
|
||
|
|
name = 'unknown'
|
||
|
|
try:
|
||
|
|
self.cmap = CMapDB.get_cmap(name)
|
||
|
|
except CMapDB.CMapNotFound as e:
|
||
|
|
if strict:
|
||
|
|
raise PDFFontError(e)
|
||
|
|
self.cmap = CMap()
|
||
|
|
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 = None
|
||
|
|
if 'ToUnicode' in spec:
|
||
|
|
strm = stream_value(spec['ToUnicode'])
|
||
|
|
self.unicode_map = FileUnicodeMap()
|
||
|
|
CMapParser(self.unicode_map, BytesIO(strm.get_data())).run()
|
||
|
|
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 as e:
|
||
|
|
pass
|
||
|
|
|
||
|
|
self.vertical = self.cmap.is_vertical()
|
||
|
|
if self.vertical:
|
||
|
|
# writing mode: vertical
|
||
|
|
widths = get_widths2(list_value(spec.get('W2', [])))
|
||
|
|
self.disps = dict((cid, (vx, vy)) for (cid, (_, (vx, vy))) in six.iteritems(widths))
|
||
|
|
(vy, w) = spec.get('DW2', [880, -1000])
|
||
|
|
self.default_disp = (None, vy)
|
||
|
|
widths = dict((cid, w) for (cid, (w, _)) in six.iteritems(widths))
|
||
|
|
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)
|
||
|
|
return
|
||
|
|
|
||
|
|
def __repr__(self):
|
||
|
|
return '<PDFCIDFont: basefont=%r, cidcoding=%r>' % (self.basefont, self.cidcoding)
|
||
|
|
|
||
|
|
def is_vertical(self):
|
||
|
|
return self.vertical
|
||
|
|
|
||
|
|
def is_multibyte(self):
|
||
|
|
return True
|
||
|
|
|
||
|
|
def decode(self, bytes):
|
||
|
|
return self.cmap.decode(bytes)
|
||
|
|
|
||
|
|
def char_disp(self, cid):
|
||
|
|
"Returns an integer for horizontal fonts, a tuple for vertical fonts."
|
||
|
|
return self.disps.get(cid, self.default_disp)
|
||
|
|
|
||
|
|
def to_unichr(self, cid):
|
||
|
|
try:
|
||
|
|
if not self.unicode_map:
|
||
|
|
raise KeyError(cid)
|
||
|
|
return self.unicode_map.get_unichr(cid)
|
||
|
|
except KeyError:
|
||
|
|
raise PDFUnicodeNotDefined(self.cidcoding, cid)
|
||
|
|
|
||
|
|
|
||
|
|
# main
|
||
|
|
def main(argv):
|
||
|
|
for fname in argv[1:]:
|
||
|
|
fp = open(fname, 'rb')
|
||
|
|
#font = TrueTypeFont(fname, fp)
|
||
|
|
font = CFFFont(fname, fp)
|
||
|
|
print (font)
|
||
|
|
fp.close()
|
||
|
|
return
|
||
|
|
|
||
|
|
if __name__ == '__main__':
|
||
|
|
sys.exit(main(sys.argv))
|