587 lines
20 KiB
Python
587 lines
20 KiB
Python
#!/usr/bin/env python
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import sys
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stderr = sys.stderr
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from struct import pack, unpack
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try:
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from cStringIO import StringIO
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except ImportError:
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from StringIO import StringIO
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from psparser import PSLiteralTable, PSKeywordTable, PSLiteral, \
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literal_name, keyword_name, STRICT
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from pdftypes import PDFException, \
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resolve1, int_value, float_value, num_value, \
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str_value, list_value, dict_value, stream_value
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from cmap import CMap, CMapDB, CMapParser, FontMetricsDB, EncodingDB
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from utils import apply_matrix_norm, nunpack
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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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NIBBLES = ('0','1','2','3','4','5','6','7','8','9','.','e','e-',None,'-')
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def getdict(data):
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d = {}
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fp = StringIO(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: 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: 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 | 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) = unpack('>HB', self.fp.read(3))
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for i in xrange(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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def __iter__(self):
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return iter( self[i] for i in xrange(len(self)) )
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def __init__(self, fp0):
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self.fp = fp0
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# Header
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(_major,_minor,hdrsize,self.offsize) = 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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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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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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(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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self.charstring = self.INDEX(self.fp)
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self.nglyphs = len(self.charstring)
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# Encodings
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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 == '\x00':
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# Format 0
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(n,) = unpack('B', self.fp.read(1))
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for (code,gid) in enumerate(unpack('B'*n, self.fp.read(n))):
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self.code2gid[code] = gid
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self.gid2code[gid] = code
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else:
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# Format 1
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assert 0
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# Charsets
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self.name2gid = {}
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self.gid2name = {}
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self.fp.seek(charset_pos)
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format = self.fp.read(1)
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if format == '\x00':
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# Format 0
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n = self.nglyphs-1
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for (gid,sid) in enumerate(unpack('>'+'H'*n, self.fp.read(2*n))):
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gid += 1
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name = self.getstr(sid)
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self.name2gid[name] = gid
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self.gid2name[gid] = name
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else:
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# Format 1
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assert 0
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#print self.code2gid
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#print self.name2gid
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#assert 0
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return
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def getstr(self, sid):
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if sid < len(self.STANDARD_STRINGS):
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return self.STANDARD_STRINGS[sid]
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return self.string_index[sid-len(self.STANDARD_STRINGS)]
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## TrueTypeFont
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##
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class TrueTypeFont(object):
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class CMapNotFound(Exception): pass
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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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self.tables = {}
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fonttype = fp.read(4)
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(ntables, _1, _2, _3) = unpack('>HHHH', fp.read(8))
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for i in xrange(ntables):
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(name, tsum, offset, length) = unpack('>4sLLL', fp.read(16))
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self.tables[name] = (offset, length)
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return
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def create_cmap(self):
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if 'cmap' not in self.tables:
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raise TrueTypeFont.CMapNotFound
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(base_offset, length) = self.tables['cmap']
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fp = self.fp
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fp.seek(base_offset)
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(version, nsubtables) = unpack('>HH', fp.read(4))
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subtables = []
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for i in xrange(nsubtables):
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subtables.append(unpack('>HHL', fp.read(8)))
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char2gid = {}
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# Only supports subtable type 0, 2 and 4.
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for (_1, _2, st_offset) in subtables:
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fp.seek(base_offset+st_offset)
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(fmttype, fmtlen, fmtlang) = unpack('>HHH', fp.read(6))
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if fmttype == 0:
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char2gid.update(enumerate(unpack('>256B', fp.read(256))))
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elif fmttype == 2:
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subheaderkeys = unpack('>256H', fp.read(512))
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firstbytes = [0]*8192
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for (i,k) in enumerate(subheaderkeys):
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firstbytes[k/8] = i
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nhdrs = max(subheaderkeys)/8 + 1
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hdrs = []
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for i in xrange(nhdrs):
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(firstcode,entcount,delta,offset) = unpack('>HHhH', fp.read(8))
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hdrs.append((i,firstcode,entcount,delta,fp.tell()-2+offset))
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for (i,firstcode,entcount,delta,pos) in hdrs:
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if not entcount: continue
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first = firstcode + (firstbytes[i] << 8)
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fp.seek(pos)
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for c in xrange(entcount):
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gid = unpack('>H', fp.read(2))
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if gid:
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gid += delta
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char2gid[first+c] = gid
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elif fmttype == 4:
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(segcount, _1, _2, _3) = unpack('>HHHH', fp.read(8))
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segcount /= 2
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ecs = unpack('>%dH' % segcount, fp.read(2*segcount))
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fp.read(2)
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scs = unpack('>%dH' % segcount, fp.read(2*segcount))
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idds = unpack('>%dh' % segcount, fp.read(2*segcount))
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pos = fp.tell()
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idrs = unpack('>%dH' % segcount, fp.read(2*segcount))
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for (ec,sc,idd,idr) in zip(ecs, scs, idds, idrs):
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if idr:
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fp.seek(pos+idr)
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for c in xrange(sc, ec+1):
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char2gid[c] = (unpack('>H', fp.read(2))[0] + idd) & 0xffff
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else:
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for c in xrange(sc, ec+1):
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char2gid[c] = (c + idd) & 0xffff
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gid2char = dict( (gid, pack('>H', char))
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for (char,gid) in char2gid.iteritems() )
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return CMap().update(char2gid, gid2char)
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## Fonts
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##
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class PDFFontError(PDFException): pass
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class PDFUnicodeNotDefined(PDFFontError): pass
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LITERAL_STANDARD_ENCODING = PSLiteralTable.intern('StandardEncoding')
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LITERAL_TYPE1C = PSLiteralTable.intern('Type1C')
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# PDFFont
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class PDFFont(object):
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def __init__(self, descriptor, widths, default_width=None):
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self.descriptor = descriptor
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self.widths = widths
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self.fontname = descriptor.get('FontName', 'unknown')
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if isinstance(self.fontname, PSLiteral):
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self.fontname = literal_name(self.fontname)
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self.ascent = num_value(descriptor.get('Ascent', 0))
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self.descent = num_value(descriptor.get('Descent', 0))
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self.default_width = default_width or descriptor.get('MissingWidth', 0)
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self.leading = num_value(descriptor.get('Leading', 0))
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self.bbox = list_value(descriptor.get('FontBBox', (0,0,0,0)))
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return
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def __repr__(self):
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return '<PDFFont>'
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def is_vertical(self):
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return False
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def is_multibyte(self):
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return False
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def decode(self, bytes):
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return map(ord, bytes)
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def get_ascent(self):
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return self.ascent * .001
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def get_descent(self):
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return self.descent * .001
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def char_width(self, cid):
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return self.widths.get(cid, self.default_width) * .001
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def char_disp(self, cid):
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return 0
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def string_width(self, s):
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return sum( self.char_width(cid) for cid in self.decode(s) )
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def space_width(self):
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return max(self.char_width(32), self.char_width(44), self.char_width(46)) * 0.5
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# PDFSimpleFont
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class PDFSimpleFont(PDFFont):
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def __init__(self, descriptor, widths, spec):
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# Font encoding is specified either by a name of
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# built-in encoding or a dictionary that describes
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# the differences.
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if 'Encoding' in spec:
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encoding = resolve1(spec['Encoding'])
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else:
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encoding = LITERAL_STANDARD_ENCODING
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if isinstance(encoding, dict):
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name = literal_name(encoding.get('BaseEncoding', LITERAL_STANDARD_ENCODING))
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diff = list_value(encoding.get('Differences', None))
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self.encoding = EncodingDB.get_encoding(name, diff)
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else:
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self.encoding = EncodingDB.get_encoding(literal_name(encoding))
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self.ucs2_cmap = None
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if 'ToUnicode' in spec:
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strm = stream_value(spec['ToUnicode'])
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self.ucs2_cmap = CMap()
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CMapParser(self.ucs2_cmap, StringIO(strm.get_data())).run()
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PDFFont.__init__(self, descriptor, widths)
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return
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def to_unicode(self, cid):
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if self.ucs2_cmap:
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code = self.ucs2_cmap.tocode(cid)
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if code:
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chars = unpack('>%dH' % (len(code)/2), code)
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return ''.join( unichr(c) for c in chars )
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try:
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return self.encoding[cid]
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except KeyError:
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raise PDFUnicodeNotDefined(None, cid)
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# PDFType1Font
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class PDFType1Font(PDFSimpleFont):
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def __init__(self, rsrc, spec):
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try:
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self.basefont = literal_name(spec['BaseFont'])
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except KeyError:
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if STRICT:
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raise PDFFontError('BaseFont is missing')
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self.basefont = 'unknown'
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try:
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(descriptor, widths) = FontMetricsDB.get_metrics(self.basefont)
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except KeyError:
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descriptor = dict_value(spec.get('FontDescriptor', {}))
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firstchar = int_value(spec.get('FirstChar', 0))
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lastchar = int_value(spec.get('LastChar', 255))
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widths = list_value(spec.get('Widths', [0]*256))
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widths = dict( (i+firstchar,w) for (i,w) in enumerate(widths) )
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PDFSimpleFont.__init__(self, descriptor, widths, spec)
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|
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, rsrc, 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 = {'FontName':spec.get('Name'),
|
|
'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>'
|
|
|
|
def get_ascent(self):
|
|
return self.ascent * self.vscale
|
|
def get_descent(self):
|
|
return self.descent * self.vscale
|
|
|
|
def char_width(self, cid):
|
|
return self.widths.get(cid, self.default_width) * self.hscale
|
|
|
|
|
|
# PDFCIDFont
|
|
class PDFCIDFont(PDFFont):
|
|
|
|
def __init__(self, rsrc, spec):
|
|
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' % (self.cidsysteminfo.get('Registry', 'unknown'),
|
|
self.cidsysteminfo.get('Ordering', 'unknown'))
|
|
try:
|
|
name = literal_name(spec['Encoding'])
|
|
except KeyError:
|
|
if STRICT:
|
|
raise PDFFontError('Encoding is unspecified')
|
|
name = 'unknown'
|
|
try:
|
|
self.cmap = rsrc.get_cmap(name, strict=STRICT)
|
|
except CMapDB.CMapNotFound, e:
|
|
raise PDFFontError(e)
|
|
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,
|
|
StringIO(self.fontfile.get_data()))
|
|
self.ucs2_cmap = None
|
|
if 'ToUnicode' in spec:
|
|
strm = stream_value(spec['ToUnicode'])
|
|
self.ucs2_cmap = CMap()
|
|
CMapParser(self.ucs2_cmap, StringIO(strm.get_data())).run()
|
|
elif self.cidcoding == 'Adobe-Identity':
|
|
if ttf:
|
|
try:
|
|
self.ucs2_cmap = ttf.create_cmap()
|
|
except TrueTypeFont.CMapNotFound:
|
|
pass
|
|
else:
|
|
try:
|
|
self.ucs2_cmap = rsrc.get_cmap('%s-UCS2' % self.cidcoding,
|
|
strict=STRICT)
|
|
except CMapDB.CMapNotFound, e:
|
|
raise PDFFontError(e)
|
|
|
|
def get_width(seq):
|
|
dic = {}
|
|
char1 = char2 = None
|
|
for v in seq:
|
|
if char1 == None:
|
|
char1 = v
|
|
elif char2 == None and isinstance(v, int):
|
|
char2 = v
|
|
else:
|
|
if char2 == None:
|
|
for (i,w) in enumerate(v):
|
|
dic[char1+i] = w
|
|
else:
|
|
for i in xrange(char1, char2+1):
|
|
dic[i] = v
|
|
char1 = char2 = None
|
|
return dic
|
|
self.vertical = self.cmap.is_vertical()
|
|
if self.vertical:
|
|
# writing mode: vertical
|
|
dic = get_width(list_value(spec.get('W2', [])))
|
|
widths = dict( (cid,w) for (cid,(d,w)) in dic.iteritems() )
|
|
self.disps = dict( (cid,d) for (cid,(d,w)) in dic.iteritems() )
|
|
(d,w) = spec.get('DW2', [880, -1000])
|
|
default_width = w
|
|
self.default_disp = d
|
|
else:
|
|
# writing mode: horizontal
|
|
widths = get_width(list_value(spec.get('W', [])))
|
|
self.disps = {}
|
|
default_width = spec.get('DW', 1000)
|
|
self.default_disp = 0
|
|
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):
|
|
return self.disps.get(cid, self.default_disp)
|
|
|
|
def to_unicode(self, cid):
|
|
if not self.ucs2_cmap:
|
|
raise PDFUnicodeNotDefined(self.cidcoding, cid)
|
|
code = self.ucs2_cmap.tocode(cid)
|
|
if not code:
|
|
raise PDFUnicodeNotDefined(self.cidcoding, cid)
|
|
chars = unpack('>%dH' % (len(code)/2), code)
|
|
return ''.join( unichr(c) for c in chars )
|
|
|
|
def space_width(self):
|
|
return 0
|
|
|
|
|
|
# main
|
|
def main(argv):
|
|
for fname in argv[1:]:
|
|
fp = file(fname, 'rb')
|
|
CFFFont(fp)
|
|
fp.close()
|
|
return
|
|
if __name__ == '__main__': sys.exit(main(sys.argv))
|