Current File : //lib/python3/dist-packages/chm/chm.py
# Copyright (C) 2003-2006 Rubens Ramos <rubensr@users.sourceforge.net>
#
# Based on code by:
# Copyright (C) 2003 Razvan Cojocaru <razvanco@gmx.net>
#
# pychm is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public
# License along with this program; see the file COPYING. If not,
# write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA
'''
chm - A high-level front end for the chmlib python module.
The chm module provides high level access to the functionality
included in chmlib. It encapsulates functions in the CHMFile class, and
provides some additional features, such as the ability to obtain
the contents tree of a CHM archive.
'''
from . import chmlib
from . import extra
import array
import posixpath
import sys
charset_table = {
0: b'iso8859_1', # ANSI_CHARSET
238: b'iso8859_2', # EASTEUROPE_CHARSET
178: b'iso8859_6', # ARABIC_CHARSET
161: b'iso8859_7', # GREEK_CHARSET
177: b'iso8859_8', # HEBREW_CHARSET
162: b'iso8859_9', # TURKISH_CHARSET
222: b'iso8859_11', # THAI_CHARSET
186: b'iso8859_13', # BALTIC_CHARSET
204: b'cp1251', # RUSSIAN_CHARSET
255: b'cp437', # OEM_CHARSET
128: b'cp932', # SHIFTJIS_CHARSET
134: b'cp936', # GB2312_CHARSET
129: b'cp949', # HANGUL_CHARSET
136: b'cp950', # CHINESEBIG5_CHARSET
1: None, # DEFAULT_CHARSET
2: None, # SYMBOL_CHARSET
130: None, # JOHAB_CHARSET
163: None, # VIETNAMESE_CHARSET
77: None, # MAC_CHARSET
}
locale_table = {
0x0436: (b'iso8859_1', b'Afrikaans', b'Western Europe & US'),
0x041c: (b'iso8859_2', b'Albanian', b'Central Europe'),
0x0401: (b'iso8859_6', b'Arabic_Saudi_Arabia', b'Arabic'),
0x0801: (b'iso8859_6', b'Arabic_Iraq', b'Arabic'),
0x0c01: (b'iso8859_6', b'Arabic_Egypt', b'Arabic'),
0x1001: (b'iso8859_6', b'Arabic_Libya', b'Arabic'),
0x1401: (b'iso8859_6', b'Arabic_Algeria', b'Arabic'),
0x1801: (b'iso8859_6', b'Arabic_Morocco', b'Arabic'),
0x1c01: (b'iso8859_6', b'Arabic_Tunisia', b'Arabic'),
0x2001: (b'iso8859_6', b'Arabic_Oman', b'Arabic'),
0x2401: (b'iso8859_6', b'Arabic_Yemen', b'Arabic'),
0x2801: (b'iso8859_6', b'Arabic_Syria', b'Arabic'),
0x2c01: (b'iso8859_6', b'Arabic_Jordan', b'Arabic'),
0x3001: (b'iso8859_6', b'Arabic_Lebanon', b'Arabic'),
0x3401: (b'iso8859_6', b'Arabic_Kuwait', b'Arabic'),
0x3801: (b'iso8859_6', b'Arabic_UAE', b'Arabic'),
0x3c01: (b'iso8859_6', b'Arabic_Bahrain', b'Arabic'),
0x4001: (b'iso8859_6', b'Arabic_Qatar', b'Arabic'),
0x042b: (None, b'Armenian', b'Armenian'),
0x042c: (b'iso8859_9', b'Azeri_Latin', b'Turkish'),
0x082c: (b'cp1251', b'Azeri_Cyrillic', b'Cyrillic'),
0x042d: (b'iso8859_1', b'Basque', b'Western Europe & US'),
0x0423: (b'cp1251', b'Belarusian', b'Cyrillic'),
0x0402: (b'cp1251', b'Bulgarian', b'Cyrillic'),
0x0403: (b'iso8859_1', b'Catalan', b'Western Europe & US'),
0x0404: (b'cp950', b'Chinese_Taiwan', b'Traditional Chinese'),
0x0804: (b'cp936', b'Chinese_PRC', b'Simplified Chinese'),
0x0c04: (b'cp950', b'Chinese_Hong_Kong', b'Traditional Chinese'),
0x1004: (b'cp936', b'Chinese_Singapore', b'Simplified Chinese'),
0x1404: (b'cp950', b'Chinese_Macau', b'Traditional Chinese'),
0x041a: (b'iso8859_2', b'Croatian', b'Central Europe'),
0x0405: (b'iso8859_2', b'Czech', b'Central Europe'),
0x0406: (b'iso8859_1', b'Danish', b'Western Europe & US'),
0x0413: (b'iso8859_1', b'Dutch_Standard', b'Western Europe & US'),
0x0813: (b'iso8859_1', b'Dutch_Belgian', b'Western Europe & US'),
0x0409: (b'iso8859_1', b'English_United_States', b'Western Europe & US'),
0x0809: (b'iso8859_1', b'English_United_Kingdom', b'Western Europe & US'),
0x0c09: (b'iso8859_1', b'English_Australian', b'Western Europe & US'),
0x1009: (b'iso8859_1', b'English_Canadian', b'Western Europe & US'),
0x1409: (b'iso8859_1', b'English_New_Zealand', b'Western Europe & US'),
0x1809: (b'iso8859_1', b'English_Irish', b'Western Europe & US'),
0x1c09: (b'iso8859_1', b'English_South_Africa', b'Western Europe & US'),
0x2009: (b'iso8859_1', b'English_Jamaica', b'Western Europe & US'),
0x2409: (b'iso8859_1', b'English_Caribbean', b'Western Europe & US'),
0x2809: (b'iso8859_1', b'English_Belize', b'Western Europe & US'),
0x2c09: (b'iso8859_1', b'English_Trinidad', b'Western Europe & US'),
0x3009: (b'iso8859_1', b'English_Zimbabwe', b'Western Europe & US'),
0x3409: (b'iso8859_1', b'English_Philippines', b'Western Europe & US'),
0x0425: (b'iso8859_13', b'Estonian', b'Baltic'),
0x0438: (b'iso8859_1', b'Faeroese', b'Western Europe & US'),
0x0429: (b'iso8859_6', b'Farsi', b'Arabic'),
0x040b: (b'iso8859_1', b'Finnish', b'Western Europe & US'),
0x040c: (b'iso8859_1', b'French_Standard', b'Western Europe & US'),
0x080c: (b'iso8859_1', b'French_Belgian', b'Western Europe & US'),
0x0c0c: (b'iso8859_1', b'French_Canadian', b'Western Europe & US'),
0x100c: (b'iso8859_1', b'French_Swiss', b'Western Europe & US'),
0x140c: (b'iso8859_1', b'French_Luxembourg', b'Western Europe & US'),
0x180c: (b'iso8859_1', b'French_Monaco', b'Western Europe & US'),
0x0437: (None, b'Georgian', b'Georgian'),
0x0407: (b'iso8859_1', b'German_Standard', b'Western Europe & US'),
0x0807: (b'iso8859_1', b'German_Swiss', b'Western Europe & US'),
0x0c07: (b'iso8859_1', b'German_Austrian', b'Western Europe & US'),
0x1007: (b'iso8859_1', b'German_Luxembourg', b'Western Europe & US'),
0x1407: (b'iso8859_1', b'German_Liechtenstein', b'Western Europe & US'),
0x0408: (b'iso8859_7', b'Greek', b'Greek'),
0x040d: (b'iso8859_8', b'Hebrew', b'Hebrew'),
0x0439: (None, b'Hindi', b'Indic'),
0x040e: (b'iso8859_2', b'Hungarian', b'Central Europe'),
0x040f: (b'iso8859_1', b'Icelandic', b'Western Europe & US'),
0x0421: (b'iso8859_1', b'Indonesian', b'Western Europe & US'),
0x0410: (b'iso8859_1', b'Italian_Standard', b'Western Europe & US'),
0x0810: (b'iso8859_1', b'Italian_Swiss', b'Western Europe & US'),
0x0411: (b'cp932', b'Japanese', b'Japanese'),
0x043f: (b'cp1251', b'Kazakh', b'Cyrillic'),
0x0457: (None, b'Konkani', b'Indic'),
0x0412: (b'cp949', b'Korean', b'Korean'),
0x0426: (b'iso8859_13', b'Latvian', b'Baltic'),
0x0427: (b'iso8859_13', b'Lithuanian', b'Baltic'),
0x042f: (b'cp1251', b'Macedonian', b'Cyrillic'),
0x043e: (b'iso8859_1', b'Malay_Malaysia', b'Western Europe & US'),
0x083e: (b'iso8859_1', b'Malay_Brunei_Darussalam', b'Western Europe & US'),
0x044e: (None, b'Marathi', b'Indic'),
0x0414: (b'iso8859_1', b'Norwegian_Bokmal', b'Western Europe & US'),
0x0814: (b'iso8859_1', b'Norwegian_Nynorsk', b'Western Europe & US'),
0x0415: (b'iso8859_2', b'Polish', b'Central Europe'),
0x0416: (b'iso8859_1', b'Portuguese_Brazilian', b'Western Europe & US'),
0x0816: (b'iso8859_1', b'Portuguese_Standard', b'Western Europe & US'),
0x0418: (b'iso8859_2', b'Romanian', b'Central Europe'),
0x0419: (b'cp1251', b'Russian', b'Cyrillic'),
0x044f: (None, b'Sanskrit', b'Indic'),
0x081a: (b'iso8859_2', b'Serbian_Latin', b'Central Europe'),
0x0c1a: (b'cp1251', b'Serbian_Cyrillic', b'Cyrillic'),
0x041b: (b'iso8859_2', b'Slovak', b'Central Europe'),
0x0424: (b'iso8859_2', b'Slovenian', b'Central Europe'),
0x040a: (b'iso8859_1', b'Spanish_Trad_Sort', b'Western Europe & US'),
0x080a: (b'iso8859_1', b'Spanish_Mexican', b'Western Europe & US'),
0x0c0a: (b'iso8859_1', b'Spanish_Modern_Sort', b'Western Europe & US'),
0x100a: (b'iso8859_1', b'Spanish_Guatemala', b'Western Europe & US'),
0x140a: (b'iso8859_1', b'Spanish_Costa_Rica', b'Western Europe & US'),
0x180a: (b'iso8859_1', b'Spanish_Panama', b'Western Europe & US'),
0x1c0a: (b'iso8859_1', b'Spanish_Dominican_Repub', b'Western Europe & US'),
0x200a: (b'iso8859_1', b'Spanish_Venezuela', b'Western Europe & US'),
0x240a: (b'iso8859_1', b'Spanish_Colombia', b'Western Europe & US'),
0x280a: (b'iso8859_1', b'Spanish_Peru', b'Western Europe & US'),
0x2c0a: (b'iso8859_1', b'Spanish_Argentina', b'Western Europe & US'),
0x300a: (b'iso8859_1', b'Spanish_Ecuador', b'Western Europe & US'),
0x340a: (b'iso8859_1', b'Spanish_Chile', b'Western Europe & US'),
0x380a: (b'iso8859_1', b'Spanish_Uruguay', b'Western Europe & US'),
0x3c0a: (b'iso8859_1', b'Spanish_Paraguay', b'Western Europe & US'),
0x400a: (b'iso8859_1', b'Spanish_Bolivia', b'Western Europe & US'),
0x440a: (b'iso8859_1', b'Spanish_El_Salvador', b'Western Europe & US'),
0x480a: (b'iso8859_1', b'Spanish_Honduras', b'Western Europe & US'),
0x4c0a: (b'iso8859_1', b'Spanish_Nicaragua', b'Western Europe & US'),
0x500a: (b'iso8859_1', b'Spanish_Puerto_Rico', b'Western Europe & US'),
0x0441: (b'iso8859_1', b'Swahili', b'Western Europe & US'),
0x041d: (b'iso8859_1', b'Swedish', b'Western Europe & US'),
0x081d: (b'iso8859_1', b'Swedish_Finland', b'Western Europe & US'),
0x0449: (None, b'Tamil', b'Indic'),
0x0444: (b'cp1251', b'Tatar', b'Cyrillic'),
0x041e: (b'iso8859_11', b'Thai', b'Thai'),
0x041f: (b'iso8859_9', b'Turkish', b'Turkish'),
0x0422: (b'cp1251', b'Ukrainian', b'Cyrillic'),
0x0420: (b'iso8859_6', b'Urdu', b'Arabic'),
0x0443: (b'iso8859_9', b'Uzbek_Latin', b'Turkish'),
0x0843: (b'cp1251', b'Uzbek_Cyrillic', b'Cyrillic'),
0x042a: (None, b'Vietnamese', b'Vietnamese')
}
class CHMFile:
"A class to manage access to CHM files."
filename = b''
file = None
title = b''
home = b'/'
index = None
topics = None
encoding = None
lcid = None
binaryindex = None
def __init__(self):
self.searchable = 0
def LoadCHM(self, archiveName):
'''Loads a CHM archive.
This function will also call GetArchiveInfo to obtain information
such as the index file name and the topics file. It returns 1 on
success, and 0 if it fails.
'''
if self.filename != b'':
self.CloseCHM()
if isinstance(archiveName, str):
archiveName = archiveName.encode(sys.getfilesystemencoding())
self.file = chmlib.chm_open(archiveName)
if self.file is None:
return 0
self.filename = archiveName
self.GetArchiveInfo()
return 1
def CloseCHM(self):
'''Closes the CHM archive.
This function will close the CHM file, if it is open. All variables
are also reset.
'''
if self.filename != b'':
chmlib.chm_close(self.file)
self.file = None
self.filename = b''
self.title = b''
self.home = b'/'
self.index = None
self.topics = None
self.encoding = None
def GetArchiveInfo(self):
'''Obtains information on CHM archive.
This function checks the /#SYSTEM file inside the CHM archive to
obtain the index, home page, topics, encoding and title. It is called
from LoadCHM.
'''
self.searchable = extra.is_searchable(self.file)
self.lcid = None
result, ui = chmlib.chm_resolve_object(self.file, b'/#SYSTEM')
if (result != chmlib.CHM_RESOLVE_SUCCESS):
return 0
size, text = chmlib.chm_retrieve_object(self.file, ui, 4, ui.length)
if (size == 0):
return 0
buff = array.array('B', text)
index = 0
while (index < size):
cursor = buff[index] + (buff[index+1] * 256)
if (cursor == 0):
index += 2
cursor = buff[index] + (buff[index+1] * 256)
index += 2
self.topics = b'/' + text[index:index+cursor-1]
elif (cursor == 1):
index += 2
cursor = buff[index] + (buff[index+1] * 256)
index += 2
self.index = b'/' + text[index:index+cursor-1]
elif (cursor == 2):
index += 2
cursor = buff[index] + (buff[index+1] * 256)
index += 2
self.home = b'/' + text[index:index+cursor-1]
elif (cursor == 3):
index += 2
cursor = buff[index] + (buff[index+1] * 256)
index += 2
self.title = text[index:index+cursor-1]
elif (cursor == 4):
index += 2
cursor = buff[index] + (buff[index+1] * 256)
index += 2
self.lcid = buff[index] + (buff[index+1] * 256)
elif (cursor == 6):
index += 2
cursor = buff[index] + (buff[index+1] * 256)
index += 2
tmp = text[index:index+cursor-1]
if not self.topics:
tmp1 = b'/' + tmp + b'.hhc'
tmp2 = b'/' + tmp + b'.hhk'
res1, ui1 = chmlib.chm_resolve_object(self.file, tmp1)
res2, ui2 = chmlib.chm_resolve_object(self.file, tmp2)
if not self.topics and res1 == chmlib.CHM_RESOLVE_SUCCESS:
self.topics = b'/' + tmp + b'.hhc'
if not self.index and res2 == chmlib.CHM_RESOLVE_SUCCESS:
self.index = b'/' + tmp + b'.hhk'
elif (cursor == 16):
index += 2
cursor = buff[index] + (buff[index+1] * 256)
index += 2
self.encoding = text[index:index+cursor-1]
else:
index += 2
cursor = buff[index] + (buff[index+1] * 256)
index += 2
index += cursor
self.GetWindowsInfo()
if not self.lcid:
self.lcid = extra.get_lcid(self.file)
return 1
def GetTopicsTree(self):
'''Reads and returns the topics tree.
This auxiliary function reads and returns the topics tree file
contents for the CHM archive.
'''
if self.topics is None:
return None
if self.topics:
res, ui = chmlib.chm_resolve_object(self.file, self.topics)
if (res != chmlib.CHM_RESOLVE_SUCCESS):
return None
size, text = chmlib.chm_retrieve_object(self.file, ui, 0, ui.length)
if (size == 0):
return None
return text
def GetIndex(self):
'''Reads and returns the index tree.
This auxiliary function reads and returns the index tree file
contents for the CHM archive.
'''
if self.index is None:
return None
if self.index:
res, ui = chmlib.chm_resolve_object(self.file, self.index)
if (res != chmlib.CHM_RESOLVE_SUCCESS):
return None
size, text = chmlib.chm_retrieve_object(self.file, ui, 0, ui.length)
if (size == 0):
return None
return text
def ResolveObject(self, document):
'''Tries to locate a document in the archive.
This function tries to locate the document inside the archive. It
returns a tuple where the first element is zero if the function
was successful, and the second is the UnitInfo for that document.
The UnitInfo is used to retrieve the document contents
'''
if self.file:
path = posixpath.normpath(document)
return chmlib.chm_resolve_object(self.file, path)
else:
return (1, None)
def RetrieveObject(self, ui, start=-1, length=-1):
'''Retrieves the contents of a document.
This function takes a UnitInfo and two optional arguments, the first
being the start address and the second is the length. These define
the amount of data to be read from the archive.
'''
if self.file and ui:
if start == -1:
offset = 0
else:
offset = start
if length == -1:
size = ui.length - offset
else:
size = length
content = b''
while size > 0:
(sz, chunk) = chmlib.chm_retrieve_object(self.file, ui, offset, size)
if sz == 0:
return (0, b'')
content += chunk[:sz]
size -= sz
offset += sz
return (len(content), content)
else:
return (0, b'')
def Search(self, text, wholewords=0, titleonly=0):
'''Performs full-text search on the archive.
The first parameter is the word to look for, the second
indicates if the search should be for whole words only, and
the third parameter indicates if the search should be
restricted to page titles.
This method will return a tuple, the first item
indicating if the search results were partial, and the second
item being a dictionary containing the results.'''
if text and text != b'' and self.file:
return extra.search(self.file, text, wholewords,
titleonly)
else:
return None
def IsSearchable(self):
'''Indicates if the full-text search is available for this
archive - this flag is updated when GetArchiveInfo is called'''
return self.searchable
def GetEncoding(self):
'''Returns a string that can be used with the codecs python package
to encode or decode the files in the chm archive. If an error is
found, or if it is not possible to find the encoding, None is
returned.'''
if self.encoding:
vals = self.encoding.split(b',')
if len(vals) > 2:
try:
return charset_table[int(vals[2])]
except KeyError:
pass
return None
def GetLCID(self):
'''Returns the archive Locale ID'''
if self.lcid in locale_table:
return locale_table[self.lcid]
else:
return None
def GetDWORD(self, buff, idx=0):
'''Internal method.
Reads a double word (4 bytes) from a buffer.
'''
result = buff[idx] + (buff[idx+1] << 8) + (buff[idx+2] << 16) + \
(buff[idx+3] << 24)
if result == 0xFFFFFFFF:
result = 0
return result
def GetString(self, text, idx):
'''Internal method.
Retrieves a string from the #STRINGS buffer.
'''
next = text.find(b'\x00', idx)
chunk = text[idx:next]
return chunk
def GetWindowsInfo(self):
'''Gets information from the #WINDOWS file.
Checks the #WINDOWS file to see if it has any info that was
not found in #SYSTEM (topics, index or default page.
'''
result, ui = chmlib.chm_resolve_object(self.file, b'/#WINDOWS')
if (result != chmlib.CHM_RESOLVE_SUCCESS):
return -1
size, text = chmlib.chm_retrieve_object(self.file, ui, 0, 8)
if (size < 8):
return -2
buff = array.array('B', text)
num_entries = self.GetDWORD(buff, 0)
entry_size = self.GetDWORD(buff, 4)
if num_entries < 1:
return -3
size, text = chmlib.chm_retrieve_object(self.file, ui, 8, entry_size)
if (size < entry_size):
return -4
buff = array.array('B', text)
toc_index = self.GetDWORD(buff, 0x60)
idx_index = self.GetDWORD(buff, 0x64)
dft_index = self.GetDWORD(buff, 0x68)
result, ui = chmlib.chm_resolve_object(self.file, b'/#STRINGS')
if (result != chmlib.CHM_RESOLVE_SUCCESS):
return -5
size, text = chmlib.chm_retrieve_object(self.file, ui, 0, ui.length)
if (size == 0):
return -6
if (not self.topics):
self.topics = self.GetString(text, toc_index)
if not self.topics.startswith(b'/'):
self.topics = b'/' + self.topics
if (not self.index):
self.index = self.GetString(text, idx_index)
if not self.index.startswith(b'/'):
self.index = b'/' + self.index
if (dft_index != 0):
self.home = self.GetString(text, dft_index)
if not self.home.startswith(b'/'):
self.home = b'/' + self.home
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