#! /usr/local/bin/python # -*- coding: utf-8 -*- def a2bits(chars): """ Converts a string to its bits representation as a string of 0's and 1's. >>> a2bits("Hello World!") '010010000110010101101100011011000110111100100000010101110110111101110010011011000110010000100001' """ return bin(reduce(lambda x, y : (x<<8)+y, (ord(c) for c in chars), 1))[3:] def a2bits_list(chars): """ Convert a string to its bits representation as a list of 0's and 1's. >>> a2bits_list("Hello World!") ['01001000', '01100101', '01101100', '01101100', '01101111', '00100000', '01010111', '01101111', '01110010', '01101100', '01100100', '00100001'] >>> "".join(a2bits_list("Hello World!")) '010010000110010101101100011011000110111100100000010101110110111101110010011011000110010000100001' """ return [bin(ord(x))[2:].rjust(8,"0") for x in chars] def bs(s): """ Converts an int to its bits representation as a string of 0's and 1's. """ return str(s) if s<=1 else bs(s>>1) + str(s&1) def setlsb(component, bit): """ Set Least Significant Bit of a colour component. """ return component & ~1 | int(bit) def n_at_a_time(items, n, fillvalue): """ Returns an iterator which groups n items at a time. Any final partial tuple will be padded with the fillvalue >>> list(n_at_a_time([1, 2, 3, 4, 5], 2, 'X')) [(1, 2), (3, 4), (5, 'X')] """ it = iter(items) return its.izip_longest(*[it] * n, fillvalue=fillvalue) def binary2base64(binary_file, output_file): """ """ # use mode = "rb" to read binary file fin = open(binary_file, "rb") binary_data = fin.read() fin.close() # encode binary to base64 string (printable) b64_data = base64.b64encode(binary_data) fout = open(output_file, "w") fout.write(b64_data) fout.close def base642binary(b64_fname): """ """ # read base64 string fin = open(b64_fname, "r") b64_str = fin.read() fin.close() # decode base64 string to original binary sound object return base64.b64decode(b64_str)