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This commit is contained in:
Kovid Goyal 2014-03-28 13:19:03 +05:30
parent 157a2a3a69
commit 00038f3207
1 changed files with 10 additions and 8 deletions
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18
src/calibre/ebooks/mobi/utils.py
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@ -16,7 +16,7 @@ from calibre.utils.imghdr import what
from calibre.ebooks import normalize from calibre.ebooks import normalize
IMAGE_MAX_SIZE = 10 * 1024 * 1024 IMAGE_MAX_SIZE = 10 * 1024 * 1024
RECORD_SIZE = 0x1000 # 4096 (Text record size (uncompressed)) RECORD_SIZE = 0x1000 # 4096 (Text record size (uncompressed))
def decode_string(raw, codec='utf-8', ordt_map=''): def decode_string(raw, codec='utf-8', ordt_map=''):
length, = struct.unpack(b'>B', raw[0]) length, = struct.unpack(b'>B', raw[0])
@ -87,7 +87,7 @@ def encint(value, forward=True):
byts = bytearray() byts = bytearray()
while True: while True:
b = value & 0b01111111 b = value & 0b01111111
value >>= 7 # shift value to the right by 7 bits value >>= 7 # shift value to the right by 7 bits
byts.append(b) byts.append(b)
if value == 0: if value == 0:
@ -117,7 +117,7 @@ def decint(raw, forward=True):
if not forward: if not forward:
byts.reverse() byts.reverse()
for byte in byts: for byte in byts:
val <<= 7 # Shift value to the left by 7 bits val <<= 7 # Shift value to the left by 7 bits
val |= byte val |= byte
return val, len(byts) return val, len(byts)
@ -256,7 +256,7 @@ def decode_fvwi(byts, flag_size=4):
def decode_tbs(byts, flag_size=4): def decode_tbs(byts, flag_size=4):
''' '''
Trailing byte sequences for indexing consists of series of fvwi numbers. Trailing byte sequences for indexing consists of series of fvwi numbers.
This function reads the fvwi number and its associated flags. It them uses This function reads the fvwi number and its associated flags. It then uses
the flags to read any more numbers that belong to the series. The flags are the flags to read any more numbers that belong to the series. The flags are
the lowest 4 bits of the vwi (see the encode_fvwi function above). the lowest 4 bits of the vwi (see the encode_fvwi function above).
@ -323,7 +323,8 @@ def align_block(raw, multiple=4, pad=b'\0'):
of 4. of 4.
''' '''
extra = len(raw) % multiple extra = len(raw) % multiple
if extra == 0: return raw if extra == 0:
return raw
return raw + pad*(multiple - extra) return raw + pad*(multiple - extra)
@ -370,7 +371,8 @@ def count_set_bits(num):
def to_base(num, base=32, min_num_digits=None): def to_base(num, base=32, min_num_digits=None):
digits = string.digits + string.ascii_uppercase digits = string.digits + string.ascii_uppercase
sign = 1 if num >= 0 else -1 sign = 1 if num >= 0 else -1
if num == 0: return ('0' if min_num_digits is None else '0'*min_num_digits) if num == 0:
return ('0' if min_num_digits is None else '0'*min_num_digits)
num *= sign num *= sign
ans = [] ans = []
while num: while num:
@ -454,7 +456,7 @@ def read_font_record(data, extent=1040):
extent = min(extent, len(font_data)) extent = min(extent, len(font_data))
for n in xrange(extent): for n in xrange(extent):
buf[n] ^= key[n%xor_len] # XOR of buf and key buf[n] ^= key[n%xor_len] # XOR of buf and key
font_data = bytes(buf) font_data = bytes(buf)
ans['encrypted'] = True ans['encrypted'] = True
@ -560,7 +562,7 @@ def create_text_record(text):
return data, overlap return data, overlap
class CNCX(object): # {{{ class CNCX(object): # {{{
''' '''
Create the CNCX records. These are records containing all the strings from Create the CNCX records. These are records containing all the strings from