"""A pure Python implementation of binascii. Rather slow and buggy in corner cases. PyPy provides an RPython version too. """ # borrowed from https://bitbucket.org/pypy/pypy/src/f2bf94943a41/lib_pypy/binascii.py class Error(Exception): pass class Done(Exception): pass class Incomplete(Exception): pass def a2b_uu(s): if not s: return '' length = (ord(s[0]) - 0x20) % 64 def quadruplets_gen(s): while s: try: yield ord(s[0]), ord(s[1]), ord(s[2]), ord(s[3]) except IndexError: s += ' ' yield ord(s[0]), ord(s[1]), ord(s[2]), ord(s[3]) return s = s[4:] try: result = [''.join( [chr((A - 0x20) << 2 | (((B - 0x20) >> 4) & 0x3)), chr(((B - 0x20) & 0xf) << 4 | (((C - 0x20) >> 2) & 0xf)), chr(((C - 0x20) & 0x3) << 6 | ((D - 0x20) & 0x3f)) ]) for A, B, C, D in quadruplets_gen(s[1:].rstrip())] except ValueError: raise Error('Illegal char') result = ''.join(result) trailingdata = result[length:] if trailingdata.strip('\x00'): raise Error('Trailing garbage') result = result[:length] if len(result) < length: result += ((length - len(result)) * '\x00') return bytes(result, __BRYTHON__.charset) def b2a_uu(s): length = len(s) if length > 45: raise Error('At most 45 bytes at once') def triples_gen(s): while s: try: yield ord(s[0]), ord(s[1]), ord(s[2]) except IndexError: s += '\0\0' yield ord(s[0]), ord(s[1]), ord(s[2]) return s = s[3:] result = [''.join( [chr(0x20 + (( A >> 2 ) & 0x3F)), chr(0x20 + (((A << 4) | ((B >> 4) & 0xF)) & 0x3F)), chr(0x20 + (((B << 2) | ((C >> 6) & 0x3)) & 0x3F)), chr(0x20 + (( C ) & 0x3F))]) for A, B, C in triples_gen(s)] return chr(ord(' ') + (length & 0o77)) + ''.join(result) + '\n' table_a2b_base64 = { 'A': 0, 'B': 1, 'C': 2, 'D': 3, 'E': 4, 'F': 5, 'G': 6, 'H': 7, 'I': 8, 'J': 9, 'K': 10, 'L': 11, 'M': 12, 'N': 13, 'O': 14, 'P': 15, 'Q': 16, 'R': 17, 'S': 18, 'T': 19, 'U': 20, 'V': 21, 'W': 22, 'X': 23, 'Y': 24, 'Z': 25, 'a': 26, 'b': 27, 'c': 28, 'd': 29, 'e': 30, 'f': 31, 'g': 32, 'h': 33, 'i': 34, 'j': 35, 'k': 36, 'l': 37, 'm': 38, 'n': 39, 'o': 40, 'p': 41, 'q': 42, 'r': 43, 's': 44, 't': 45, 'u': 46, 'v': 47, 'w': 48, 'x': 49, 'y': 50, 'z': 51, '0': 52, '1': 53, '2': 54, '3': 55, '4': 56, '5': 57, '6': 58, '7': 59, '8': 60, '9': 61, '+': 62, '/': 63, '=': 0, } def a2b_base64(s): if not isinstance(s, (str, bytes)): raise TypeError("expected string, got %r" % (s,)) s = s.rstrip() # clean out all invalid characters, this also strips the final '=' padding # check for correct padding def next_valid_char(s, pos): for i in range(pos + 1, len(s)): c = s[i] if c < 0x7f: try: table_a2b_base64[chr(c)] return chr(c) except KeyError: pass return None quad_pos = 0 leftbits = 0 leftchar = 0 res = [] for i, c in enumerate(s): if isinstance(c, int): c = chr(c) if c > '\x7f' or c == '\n' or c == '\r' or c == ' ': continue if c == '=': if quad_pos < 2 or (quad_pos == 2 and next_valid_char(s, i) != '='): continue else: leftbits = 0 break try: next_c = table_a2b_base64[c] except KeyError: continue quad_pos = (quad_pos + 1) & 0x03 leftchar = (leftchar << 6) | next_c leftbits += 6 if leftbits >= 8: leftbits -= 8 res.append((leftchar >> leftbits & 0xff)) leftchar &= ((1 << leftbits) - 1) if leftbits != 0: raise Error('Incorrect padding') return bytes(''.join([chr(i) for i in res]),__BRYTHON__.charset) table_b2a_base64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"\ "0123456789+/" def b2a_base64(s): length = len(s) final_length = length % 3 def triples_gen(s): while s: try: yield s[0], s[1], s[2] except IndexError: s += b'\0\0' yield s[0], s[1], s[2] return s = s[3:] a = triples_gen(s[ :length - final_length]) result = [''.join( [table_b2a_base64[( A >> 2 ) & 0x3F], table_b2a_base64[((A << 4) | ((B >> 4) & 0xF)) & 0x3F], table_b2a_base64[((B << 2) | ((C >> 6) & 0x3)) & 0x3F], table_b2a_base64[( C ) & 0x3F]]) for A, B, C in a] final = s[length - final_length:] if final_length == 0: snippet = '' elif final_length == 1: a = final[0] snippet = table_b2a_base64[(a >> 2 ) & 0x3F] + \ table_b2a_base64[(a << 4 ) & 0x3F] + '==' else: a = final[0] b = final[1] snippet = table_b2a_base64[(a >> 2) & 0x3F] + \ table_b2a_base64[((a << 4) | (b >> 4) & 0xF) & 0x3F] + \ table_b2a_base64[(b << 2) & 0x3F] + '=' return bytes(''.join(result) + snippet + '\n', __BRYTHON__.charset) def a2b_qp(s, header=False): inp = 0 odata = [] while inp < len(s): if s[inp] == '=': inp += 1 if inp >= len(s): break # Soft line breaks if (s[inp] == '\n') or (s[inp] == '\r'): if s[inp] != '\n': while inp < len(s) and s[inp] != '\n': inp += 1 if inp < len(s): inp += 1 elif s[inp] == '=': # broken case from broken python qp odata.append('=') inp += 1 elif s[inp] in hex_numbers and s[inp + 1] in hex_numbers: ch = chr(int(s[inp:inp+2], 16)) inp += 2 odata.append(ch) else: odata.append('=') elif header and s[inp] == '_': odata.append(' ') inp += 1 else: odata.append(s[inp]) inp += 1 return bytes(''.join(odata), __BRYTHON__.charset) def b2a_qp(data, quotetabs=False, istext=True, header=False): """quotetabs=True means that tab and space characters are always quoted. istext=False means that \r and \n are treated as regular characters header=True encodes space characters with '_' and requires real '_' characters to be quoted. """ MAXLINESIZE = 76 # See if this string is using CRLF line ends lf = data.find('\n') crlf = lf > 0 and data[lf-1] == '\r' inp = 0 linelen = 0 odata = [] while inp < len(data): c = data[inp] if (c > '~' or c == '=' or (header and c == '_') or (c == '.' and linelen == 0 and (inp+1 == len(data) or data[inp+1] == '\n' or data[inp+1] == '\r')) or (not istext and (c == '\r' or c == '\n')) or ((c == '\t' or c == ' ') and (inp + 1 == len(data))) or (c <= ' ' and c != '\r' and c != '\n' and (quotetabs or (not quotetabs and (c != '\t' and c != ' '))))): linelen += 3 if linelen >= MAXLINESIZE: odata.append('=') if crlf: odata.append('\r') odata.append('\n') linelen = 3 odata.append('=' + two_hex_digits(ord(c))) inp += 1 else: if (istext and (c == '\n' or (inp+1 < len(data) and c == '\r' and data[inp+1] == '\n'))): linelen = 0 # Protect against whitespace on end of line if (len(odata) > 0 and (odata[-1] == ' ' or odata[-1] == '\t')): ch = ord(odata[-1]) odata[-1] = '=' odata.append(two_hex_digits(ch)) if crlf: odata.append('\r') odata.append('\n') if c == '\r': inp += 2 else: inp += 1 else: if (inp + 1 < len(data) and data[inp+1] != '\n' and (linelen + 1) >= MAXLINESIZE): odata.append('=') if crlf: odata.append('\r') odata.append('\n') linelen = 0 linelen += 1 if header and c == ' ': c = '_' odata.append(c) inp += 1 return ''.join(odata) hex_numbers = '0123456789ABCDEF' def hex(n): if n == 0: return '0' if n < 0: n = -n sign = '-' else: sign = '' arr = [] def hex_gen(n): """ Yield a nibble at a time. """ while n: yield n % 0x10 n = n / 0x10 for nibble in hex_gen(n): arr = [hex_numbers[nibble]] + arr return sign + ''.join(arr) def two_hex_digits(n): return hex_numbers[n / 0x10] + hex_numbers[n % 0x10] def strhex_to_int(s): i = 0 for c in s: i = i * 0x10 + hex_numbers.index(c) return i hqx_encoding = '!"#$%&\'()*+,-012345689@ABCDEFGHIJKLMNPQRSTUVXYZ[`abcdefhijklmpqr' DONE = 0x7f SKIP = 0x7e FAIL = 0x7d table_a2b_hqx = [ #^@ ^A ^B ^C ^D ^E ^F ^G FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, #\b \t \n ^K ^L \r ^N ^O FAIL, FAIL, SKIP, FAIL, FAIL, SKIP, FAIL, FAIL, #^P ^Q ^R ^S ^T ^U ^V ^W FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, #^X ^Y ^Z ^[ ^\ ^] ^^ ^_ FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, # ! " # $ % & ' FAIL, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, #( ) * + , - . / 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, FAIL, FAIL, #0 1 2 3 4 5 6 7 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13, FAIL, #8 9 : ; < = > ? 0x14, 0x15, DONE, FAIL, FAIL, FAIL, FAIL, FAIL, #@ A B C D E F G 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, #H I J K L M N O 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, FAIL, #P Q R S T U V W 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, FAIL, #X Y Z [ \ ] ^ _ 0x2C, 0x2D, 0x2E, 0x2F, FAIL, FAIL, FAIL, FAIL, #` a b c d e f g 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, FAIL, #h i j k l m n o 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, FAIL, FAIL, #p q r s t u v w 0x3D, 0x3E, 0x3F, FAIL, FAIL, FAIL, FAIL, FAIL, #x y z { | } ~ ^? FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, FAIL, ] def a2b_hqx(s): result = [] def quadruples_gen(s): t = [] for c in s: res = table_a2b_hqx[ord(c)] if res == SKIP: continue elif res == FAIL: raise Error('Illegal character') elif res == DONE: yield t raise Done else: t.append(res) if len(t) == 4: yield t t = [] yield t done = 0 try: for snippet in quadruples_gen(s): length = len(snippet) if length == 4: result.append(chr(((snippet[0] & 0x3f) << 2) | (snippet[1] >> 4))) result.append(chr(((snippet[1] & 0x0f) << 4) | (snippet[2] >> 2))) result.append(chr(((snippet[2] & 0x03) << 6) | (snippet[3]))) elif length == 3: result.append(chr(((snippet[0] & 0x3f) << 2) | (snippet[1] >> 4))) result.append(chr(((snippet[1] & 0x0f) << 4) | (snippet[2] >> 2))) elif length == 2: result.append(chr(((snippet[0] & 0x3f) << 2) | (snippet[1] >> 4))) except Done: done = 1 except Error: raise return (''.join(result), done) # should this return a bytes object? #return (bytes(''.join(result), __BRYTHON__.charset), done) def b2a_hqx(s): result =[] def triples_gen(s): while s: try: yield ord(s[0]), ord(s[1]), ord(s[2]) except IndexError: yield tuple([ord(c) for c in s]) s = s[3:] for snippet in triples_gen(s): length = len(snippet) if length == 3: result.append( hqx_encoding[(snippet[0] & 0xfc) >> 2]) result.append(hqx_encoding[ ((snippet[0] & 0x03) << 4) | ((snippet[1] & 0xf0) >> 4)]) result.append(hqx_encoding[ (snippet[1] & 0x0f) << 2 | ((snippet[2] & 0xc0) >> 6)]) result.append(hqx_encoding[snippet[2] & 0x3f]) elif length == 2: result.append( hqx_encoding[(snippet[0] & 0xfc) >> 2]) result.append(hqx_encoding[ ((snippet[0] & 0x03) << 4) | ((snippet[1] & 0xf0) >> 4)]) result.append(hqx_encoding[ (snippet[1] & 0x0f) << 2]) elif length == 1: result.append( hqx_encoding[(snippet[0] & 0xfc) >> 2]) result.append(hqx_encoding[ ((snippet[0] & 0x03) << 4)]) return ''.join(result) crctab_hqx = [ 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0, ] def crc_hqx(s, crc): for c in s: crc = ((crc << 8) & 0xff00) ^ crctab_hqx[((crc >> 8) & 0xff) ^ ord(c)] return crc def rlecode_hqx(s): """ Run length encoding for binhex4. The CPython implementation does not do run length encoding of \x90 characters. This implementation does. """ if not s: return '' result = [] prev = s[0] count = 1 # Add a dummy character to get the loop to go one extra round. # The dummy must be different from the last character of s. # In the same step we remove the first character, which has # already been stored in prev. if s[-1] == '!': s = s[1:] + '?' else: s = s[1:] + '!' for c in s: if c == prev and count < 255: count += 1 else: if count == 1: if prev != '\x90': result.append(prev) else: result.extend(['\x90', '\x00']) elif count < 4: if prev != '\x90': result.extend([prev] * count) else: result.extend(['\x90', '\x00'] * count) else: if prev != '\x90': result.extend([prev, '\x90', chr(count)]) else: result.extend(['\x90', '\x00', '\x90', chr(count)]) count = 1 prev = c return ''.join(result) def rledecode_hqx(s): s = s.split('\x90') result = [s[0]] prev = s[0] for snippet in s[1:]: count = ord(snippet[0]) if count > 0: result.append(prev[-1] * (count-1)) prev = snippet else: result.append('\x90') prev = '\x90' result.append(snippet[1:]) return ''.join(result) crc_32_tab = [ 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d ] def crc32(s, crc=0): result = 0 crc = ~int(crc) & 0xffffffff #crc = ~long(crc) & 0xffffffffL for c in s: crc = crc_32_tab[(crc ^ int(ord(c))) & 0xff] ^ (crc >> 8) #crc = crc_32_tab[(crc ^ long(ord(c))) & 0xffL] ^ (crc >> 8) #/* Note: (crc >> 8) MUST zero fill on left result = crc ^ 0xffffffff if result > 2**31: result = ((result + 2**31) % 2**32) - 2**31 return result def b2a_hex(s): result = [] for char in s: c = (ord(char) >> 4) & 0xf if c > 9: c = c + ord('a') - 10 else: c = c + ord('0') result.append(chr(c)) c = ord(char) & 0xf if c > 9: c = c + ord('a') - 10 else: c = c + ord('0') result.append(chr(c)) return ''.join(result) hexlify = b2a_hex table_hex = [ -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,-1,-1, -1,-1,-1,-1, -1,10,11,12, 13,14,15,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,10,11,12, 13,14,15,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1 ] def a2b_hex(t): result = [] def pairs_gen(s): while s: try: yield table_hex[ord(s[0])], table_hex[ord(s[1])] except IndexError: if len(s): raise TypeError('Odd-length string') return s = s[2:] for a, b in pairs_gen(t): if a < 0 or b < 0: raise TypeError('Non-hexadecimal digit found') result.append(chr((a << 4) + b)) return bytes(''.join(result), __BRYTHON__.charset) unhexlify = a2b_hex