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Rearrange modules because of single-version-externally-managed
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BasioMeusPuga
377
lector/KindleUnpack/mobi_dict.py
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377
lector/KindleUnpack/mobi_dict.py
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# vim:ts=4:sw=4:softtabstop=4:smarttab:expandtab
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from __future__ import unicode_literals, division, absolute_import, print_function
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from .compatibility_utils import PY2, PY3, utf8_str, bstr, bchr
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if PY2:
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range = xrange
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array_format = b'B'
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if PY3:
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unichr = chr
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array_format = "B"
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import array
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import struct
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# note: struct pack, unpack, unpack_from all require bytestring format
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# data all the way up to at least python 2.7.5, python 3 okay with bytestring
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from .mobi_index import getVariableWidthValue, readTagSection, getTagMap
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from .mobi_utils import toHex
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DEBUG_DICT = False
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class InflectionData(object):
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def __init__(self, infldatas):
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self.infldatas = infldatas
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self.starts = []
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self.counts = []
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for idata in self.infldatas:
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start, = struct.unpack_from(b'>L', idata, 0x14)
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count, = struct.unpack_from(b'>L', idata, 0x18)
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self.starts.append(start)
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self.counts.append(count)
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def lookup(self, lookupvalue):
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i = 0
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rvalue = lookupvalue
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while rvalue >= self.counts[i]:
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rvalue = rvalue - self.counts[i]
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i += 1
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if i == len(self.counts):
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print("Error: Problem with multiple inflections data sections")
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return lookupvalue, self.starts[0], self.counts[0], self.infldatas[0]
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return rvalue, self.starts[i], self.counts[i], self.infldatas[i]
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def offsets(self, value):
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rvalue, start, count, data = self.lookup(value)
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offset, = struct.unpack_from(b'>H', data, start + 4 + (2 * rvalue))
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if rvalue + 1 < count:
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nextOffset, = struct.unpack_from(b'>H',data, start + 4 + (2 * (rvalue + 1)))
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else:
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nextOffset = None
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return offset, nextOffset, data
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class dictSupport(object):
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def __init__(self, mh, sect):
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self.mh = mh
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self.header = mh.header
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self.sect = sect
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self.metaOrthIndex = mh.metaOrthIndex
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self.metaInflIndex = mh.metaInflIndex
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def parseHeader(self, data):
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"read INDX header"
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if not data[:4] == b'INDX':
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print("Warning: index section is not INDX")
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return False
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words = (
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'len', 'nul1', 'type', 'gen', 'start', 'count', 'code',
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'lng', 'total', 'ordt', 'ligt', 'nligt', 'nctoc'
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)
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num = len(words)
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values = struct.unpack(bstr('>%dL' % num), data[4:4*(num+1)])
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header = {}
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for n in range(num):
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header[words[n]] = values[n]
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ordt1 = None
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ordt2 = None
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otype, oentries, op1, op2, otagx = struct.unpack_from(b'>LLLLL',data, 0xa4)
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header['otype'] = otype
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header['oentries'] = oentries
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if DEBUG_DICT:
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print("otype %d, oentries %d, op1 %d, op2 %d, otagx %d" % (otype, oentries, op1, op2, otagx))
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if header['code'] == 0xfdea or oentries > 0:
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# some dictionaries seem to be codepage 65002 (0xFDEA) which seems
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# to be some sort of strange EBCDIC utf-8 or 16 encoded strings
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# So we need to look for them and store them away to process leading text
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# ORDT1 has 1 byte long entries, ORDT2 has 2 byte long entries
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# we only ever seem to use the second but ...
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#
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# if otype = 0, ORDT table uses 16 bit values as offsets into the table
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# if otype = 1, ORDT table uses 8 bit values as offsets inot the table
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assert(data[op1:op1+4] == b'ORDT')
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assert(data[op2:op2+4] == b'ORDT')
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ordt1 = struct.unpack_from(bstr('>%dB' % oentries), data, op1+4)
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ordt2 = struct.unpack_from(bstr('>%dH' % oentries), data, op2+4)
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if DEBUG_DICT:
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print("parsed INDX header:")
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for key in header:
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print(key, "%x" % header[key],)
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print("\n")
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return header, ordt1, ordt2
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def getPositionMap(self):
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sect = self.sect
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positionMap = {}
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metaOrthIndex = self.metaOrthIndex
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metaInflIndex = self.metaInflIndex
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decodeInflection = True
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if metaOrthIndex != 0xFFFFFFFF:
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print("Info: Document contains orthographic index, handle as dictionary")
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if metaInflIndex == 0xFFFFFFFF:
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decodeInflection = False
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else:
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metaInflIndexData = sect.loadSection(metaInflIndex)
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print("\nParsing metaInflIndexData")
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midxhdr, mhordt1, mhordt2 = self.parseHeader(metaInflIndexData)
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metaIndexCount = midxhdr['count']
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idatas = []
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for j in range(metaIndexCount):
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idatas.append(sect.loadSection(metaInflIndex + 1 + j))
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dinfl = InflectionData(idatas)
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inflNameData = sect.loadSection(metaInflIndex + 1 + metaIndexCount)
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tagSectionStart = midxhdr['len']
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inflectionControlByteCount, inflectionTagTable = readTagSection(tagSectionStart, metaInflIndexData)
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if DEBUG_DICT:
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print("inflectionTagTable: %s" % inflectionTagTable)
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if self.hasTag(inflectionTagTable, 0x07):
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print("Error: Dictionary uses obsolete inflection rule scheme which is not yet supported")
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decodeInflection = False
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data = sect.loadSection(metaOrthIndex)
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print("\nParsing metaOrthIndex")
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idxhdr, hordt1, hordt2 = self.parseHeader(data)
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tagSectionStart = idxhdr['len']
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controlByteCount, tagTable = readTagSection(tagSectionStart, data)
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orthIndexCount = idxhdr['count']
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print("orthIndexCount is", orthIndexCount)
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if DEBUG_DICT:
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print("orthTagTable: %s" % tagTable)
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if hordt2 is not None:
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print("orth entry uses ordt2 lookup table of type ", idxhdr['otype'])
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hasEntryLength = self.hasTag(tagTable, 0x02)
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if not hasEntryLength:
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print("Info: Index doesn't contain entry length tags")
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print("Read dictionary index data")
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for i in range(metaOrthIndex + 1, metaOrthIndex + 1 + orthIndexCount):
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data = sect.loadSection(i)
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hdrinfo, ordt1, ordt2 = self.parseHeader(data)
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idxtPos = hdrinfo['start']
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entryCount = hdrinfo['count']
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idxPositions = []
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for j in range(entryCount):
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pos, = struct.unpack_from(b'>H', data, idxtPos + 4 + (2 * j))
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idxPositions.append(pos)
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# The last entry ends before the IDXT tag (but there might be zero fill bytes we need to ignore!)
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idxPositions.append(idxtPos)
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for j in range(entryCount):
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startPos = idxPositions[j]
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endPos = idxPositions[j+1]
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textLength = ord(data[startPos:startPos+1])
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text = data[startPos+1:startPos+1+textLength]
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if hordt2 is not None:
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utext = u""
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if idxhdr['otype'] == 0:
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pattern = b'>H'
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inc = 2
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else:
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pattern = b'>B'
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inc = 1
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pos = 0
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while pos < textLength:
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off, = struct.unpack_from(pattern, text, pos)
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if off < len(hordt2):
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utext += unichr(hordt2[off])
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else:
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utext += unichr(off)
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pos += inc
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text = utext.encode('utf-8')
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tagMap = getTagMap(controlByteCount, tagTable, data, startPos+1+textLength, endPos)
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if 0x01 in tagMap:
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if decodeInflection and 0x2a in tagMap:
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inflectionGroups = self.getInflectionGroups(text, inflectionControlByteCount, inflectionTagTable,
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dinfl, inflNameData, tagMap[0x2a])
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else:
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inflectionGroups = b''
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assert len(tagMap[0x01]) == 1
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entryStartPosition = tagMap[0x01][0]
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if hasEntryLength:
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# The idx:entry attribute "scriptable" must be present to create entry length tags.
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ml = b'<idx:entry scriptable="yes"><idx:orth value="' + text + b'">' + inflectionGroups + b'</idx:orth>'
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if entryStartPosition in positionMap:
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positionMap[entryStartPosition] = positionMap[entryStartPosition] + ml
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else:
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positionMap[entryStartPosition] = ml
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assert len(tagMap[0x02]) == 1
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entryEndPosition = entryStartPosition + tagMap[0x02][0]
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if entryEndPosition in positionMap:
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positionMap[entryEndPosition] = b"</idx:entry>" + positionMap[entryEndPosition]
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else:
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positionMap[entryEndPosition] = b"</idx:entry>"
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else:
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indexTags = b'<idx:entry>\n<idx:orth value="' + text + b'">\n' + inflectionGroups + b'</idx:entry>\n'
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if entryStartPosition in positionMap:
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positionMap[entryStartPosition] = positionMap[entryStartPosition] + indexTags
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else:
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positionMap[entryStartPosition] = indexTags
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return positionMap
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def hasTag(self, tagTable, tag):
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'''
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Test if tag table contains given tag.
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@param tagTable: The tag table.
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@param tag: The tag to search.
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@return: True if tag table contains given tag; False otherwise.
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'''
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for currentTag, _, _, _ in tagTable:
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if currentTag == tag:
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return True
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return False
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def getInflectionGroups(self, mainEntry, controlByteCount, tagTable, dinfl, inflectionNames, groupList):
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'''
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Create string which contains the inflection groups with inflection rules as mobipocket tags.
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@param mainEntry: The word to inflect.
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@param controlByteCount: The number of control bytes.
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@param tagTable: The tag table.
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@param data: The Inflection data object to properly select the right inflection data section to use
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@param inflectionNames: The inflection rule name data.
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@param groupList: The list of inflection groups to process.
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@return: String with inflection groups and rules or empty string if required tags are not available.
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'''
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result = b""
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for value in groupList:
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offset, nextOffset, data = dinfl.offsets(value)
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# First byte seems to be always 0x00 and must be skipped.
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assert ord(data[offset:offset+1]) == 0x00
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tagMap = getTagMap(controlByteCount, tagTable, data, offset + 1, nextOffset)
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# Make sure that the required tags are available.
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if 0x05 not in tagMap:
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print("Error: Required tag 0x05 not found in tagMap")
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return ""
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if 0x1a not in tagMap:
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print("Error: Required tag 0x1a not found in tagMap")
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return b''
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result += b'<idx:infl>'
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for i in range(len(tagMap[0x05])):
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# Get name of inflection rule.
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value = tagMap[0x05][i]
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consumed, textLength = getVariableWidthValue(inflectionNames, value)
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inflectionName = inflectionNames[value+consumed:value+consumed+textLength]
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# Get and apply inflection rule across possibly multiple inflection data sections
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value = tagMap[0x1a][i]
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rvalue, start, count, data = dinfl.lookup(value)
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offset, = struct.unpack_from(b'>H', data, start + 4 + (2 * rvalue))
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textLength = ord(data[offset:offset+1])
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inflection = self.applyInflectionRule(mainEntry, data, offset+1, offset+1+textLength)
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if inflection is not None:
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result += b' <idx:iform name="' + inflectionName + b'" value="' + inflection + b'"/>'
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result += b'</idx:infl>'
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return result
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def applyInflectionRule(self, mainEntry, inflectionRuleData, start, end):
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'''
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Apply inflection rule.
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@param mainEntry: The word to inflect.
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@param inflectionRuleData: The inflection rules.
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@param start: The start position of the inflection rule to use.
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@param end: The end position of the inflection rule to use.
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@return: The string with the inflected word or None if an error occurs.
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'''
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mode = -1
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byteArray = array.array(array_format, mainEntry)
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position = len(byteArray)
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for charOffset in range(start, end):
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char = inflectionRuleData[charOffset:charOffset+1]
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abyte = ord(char)
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if abyte >= 0x0a and abyte <= 0x13:
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# Move cursor backwards
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offset = abyte - 0x0a
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if mode not in [0x02, 0x03]:
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mode = 0x02
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position = len(byteArray)
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position -= offset
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elif abyte > 0x13:
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if mode == -1:
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print("Error: Unexpected first byte %i of inflection rule" % abyte)
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return None
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elif position == -1:
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print("Error: Unexpected first byte %i of inflection rule" % abyte)
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return None
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else:
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if mode == 0x01:
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# Insert at word start
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byteArray.insert(position, abyte)
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position += 1
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elif mode == 0x02:
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# Insert at word end
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byteArray.insert(position, abyte)
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elif mode == 0x03:
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# Delete at word end
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position -= 1
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deleted = byteArray.pop(position)
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if bchr(deleted) != char:
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if DEBUG_DICT:
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print("0x03: %s %s %s %s" % (mainEntry, toHex(inflectionRuleData[start:end]), char, bchr(deleted)))
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print("Error: Delete operation of inflection rule failed")
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return None
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elif mode == 0x04:
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# Delete at word start
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deleted = byteArray.pop(position)
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if bchr(deleted) != char:
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if DEBUG_DICT:
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print("0x03: %s %s %s %s" % (mainEntry, toHex(inflectionRuleData[start:end]), char, bchr(deleted)))
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print("Error: Delete operation of inflection rule failed")
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return None
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else:
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print("Error: Inflection rule mode %x is not implemented" % mode)
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return None
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elif abyte == 0x01:
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# Insert at word start
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if mode not in [0x01, 0x04]:
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position = 0
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mode = abyte
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elif abyte == 0x02:
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# Insert at word end
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if mode not in [0x02, 0x03]:
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position = len(byteArray)
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mode = abyte
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elif abyte == 0x03:
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# Delete at word end
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if mode not in [0x02, 0x03]:
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position = len(byteArray)
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mode = abyte
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elif abyte == 0x04:
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# Delete at word start
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if mode not in [0x01, 0x04]:
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position = 0
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# Delete at word start
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mode = abyte
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else:
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print("Error: Inflection rule mode %x is not implemented" % abyte)
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return None
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return utf8_str(byteArray.tostring())
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