Current File : //lib/calibre/calibre/ebooks/metadata/rb.py
__license__ = 'GPL v3'
__copyright__ = '2008, Ashish Kulkarni <kulkarni.ashish@gmail.com>'
'''Read meta information from RB files'''
import sys, struct
from calibre import prints
from calibre.ebooks.metadata import MetaInformation, string_to_authors
MAGIC = b'\xb0\x0c\xb0\x0c\x02\x00NUVO\x00\x00\x00\x00'
def get_metadata(stream):
""" Return metadata as a L{MetaInfo} object """
title = 'Unknown'
mi = MetaInformation(title, ['Unknown'])
stream.seek(0)
try:
if not stream.read(14) == MAGIC:
print('Couldn\'t read RB header from file', file=sys.stderr)
return mi
stream.read(10)
read_i32 = lambda: struct.unpack('<I', stream.read(4))[0]
stream.seek(read_i32())
toc_count = read_i32()
for i in range(toc_count):
stream.read(32)
length, offset, flag = read_i32(), read_i32(), read_i32()
if flag == 2:
break
else:
print('Couldn\'t find INFO from RB file', file=sys.stderr)
return mi
stream.seek(offset)
info = stream.read(length).decode('utf-8', 'replace').splitlines()
for line in info:
if '=' not in line:
continue
key, value = line.split('=')
if key.strip() == 'TITLE':
mi.title = value.strip()
elif key.strip() == 'AUTHOR':
mi.authors = string_to_authors(value)
except Exception as err:
msg = 'Couldn\'t read metadata from rb: %s with error %s'%(mi.title, str(err))
prints(msg, file=sys.stderr)
raise
return mi
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