/usr/share/pyshared/kaa/metadata/audio/eyeD3/binfuncs.py is in python-kaa-metadata 0.7.7+svn4596-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (C) 2002-2005 Travis Shirk <travis@pobox.com>
# Copyright (C) 2001 Ryan Finne <ryan@finnie.org>
#
# This program 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; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
################################################################################
# Accepts a string of bytes (chars) and returns an array of bits
# representing the bytes in big endian byte (Most significant byte/bit first)
# order. Each byte can have it's higher bits ignored by passing an sz arg.
def bytes2bin(bytes, sz = 8):
if sz < 1 or sz > 8:
raise ValueError("Invalid sz value: " + str(sz));
retVal = [];
for b in bytes:
bits = [];
b = ord(b);
while b > 0:
bits.append(b & 1);
b >>= 1;
if len(bits) < sz:
bits.extend([0] * (sz - len(bits)));
elif len(bits) > sz:
bits = bits[:sz];
# Big endian byte order.
bits.reverse();
retVal.extend(bits);
if len(retVal) == 0:
retVal = [0];
return retVal;
# Convert am array of bits (MSB first) into a string of characters.
def bin2bytes(x):
bits = [];
bits.extend(x);
bits.reverse();
i = 0;
out = '';
multi = 1;
ttl = 0;
for b in bits:
i += 1;
ttl += b * multi;
multi *= 2;
if i == 8:
i = 0;
out += chr(ttl);
multi = 1;
ttl = 0;
if multi > 1:
out += chr(ttl);
out = list(out);
out.reverse();
out = ''.join(out);
return out;
# Convert and array of "bits" (MSB first) to it's decimal value.
def bin2dec(x):
bits = [];
bits.extend(x);
bits.reverse();
multi = 1;
value = long(0);
for b in bits:
value += b * multi;
multi *= 2;
return value;
def bytes2dec(bytes, sz = 8):
return bin2dec(bytes2bin(bytes, sz));
# Convert a decimal value to an array of bits (MSB first), optionally
# padding the overall size to p bits.
def dec2bin(n, p = 0):
assert(n >= 0)
retVal = [];
while n > 0:
retVal.append(n & 1);
n >>= 1;
if p > 0:
retVal.extend([0] * (p - len(retVal)));
retVal.reverse();
return retVal;
def dec2bytes(n, p = 0):
return bin2bytes(dec2bin(n, p));
# Convert a list of bits (MSB first) to a synch safe list of bits (section 6.2
# of the ID3 2.4 spec).
def bin2synchsafe(x):
if len(x) > 32 or bin2dec(x) > 268435456: # 2^28
raise ValueError("Invalid value");
elif len(x) < 8:
return x;
n = bin2dec(x);
bites = "";
bites += chr((n >> 21) & 0x7f);
bites += chr((n >> 14) & 0x7f);
bites += chr((n >> 7) & 0x7f);
bites += chr((n >> 0) & 0x7f);
bits = bytes2bin(bites);
if len(bits) < 32:
bits = ([0] * (32 - len(x))) + bits;
return bits;
def bytes2str(bytes):
s = ""
for b in bytes:
s += ("\\x%02x" % ord(b))
return s
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