cn(1) [osx man page]
cn(1) BSD General Commands Manual cn(1) NAME
cn, -- Command line interface to CommonNumerics routines. SYNOPSIS
cn, [-p prompt] [command] [command_options] [command_args] DESCRIPTION
A simple command line utility allowing you to perform CRC and Base Encode/Decode with the Common Numerics functions. cn, has the following standard options for all sub-commands: -h Show help information. -a Use the specified algorithm. The CRC, Encode, and Decode commands have various algorithms that can be used on data provided to them. -s -<string> Performs the operation on the specified string value. -v Function in Verbose mode. CN COMMAND SUMMARY
cn, currently only provides functions for two activities: CRC calculation and Base Encoding and Decoding (base16, base32, base64). Here are brief descriptions of all the cn, commands: crc Perform a CRC on the data provided either as a string or on stdin. Algorithms 10 - kCN_CRC_8 11 - kCN_CRC_8_ICODE 12 - kCN_CRC_8_ITU 13 - kCN_CRC_8_ROHC 14 - kCN_CRC_8_WCDMA 20 - kCN_CRC_16 21 - kCN_CRC_16_CCITT_TRUE 22 - kCN_CRC_16_CCITT_FALSE 23 - kCN_CRC_16_USB 24 - kCN_CRC_16_XMODEM 25 - kCN_CRC_16_DECT_R 26 - kCN_CRC_16_DECT_X 27 - kCN_CRC_16_ICODE 28 - kCN_CRC_16_VERIFONE 29 - kCN_CRC_16_A 30 - kCN_CRC_16_B 31 - kCN_CRC_16_Fletcher 40 - kCN_CRC_32_Adler 41 - kCN_CRC_32 42 - kCN_CRC_32_CASTAGNOLI 43 - kCN_CRC_32_BZIP2 44 - kCN_CRC_32_MPEG_2 45 - kCN_CRC_32_POSIX 46 - kCN_CRC_32_XFER 60 - kCN_CRC_64_ECMA_182 Encode|Decode Encode or Decode data provided either as a string or on stdin using one of the algorithms specified below. Algorithms 1 - kCNEncodingBase64 2 - kCNEncodingBase32 3 - kCNEncodingBase32Recovery 4 - kCNEncodingBase32HEX 5 - kCNEncodingBase16 ENVIRONMENT
CN_READ_SIZE The "read size" to use when processing incoming data. CN_WIDTH The number of columns in which to output data when performing a base encoding. The default is 64 columns. HISTORY
cn, was introduced in Mac OS X version 10.9 and iOS version 7.0. Darwin June 2, 2019 Darwin
Check Out this Related Man Page
Encode::Encoder(3pm) User Contributed Perl Documentation Encode::Encoder(3pm) NAME
Encode::Encoder -- Object Oriented Encoder SYNOPSIS
use Encode::Encoder; # Encode::encode("ISO-8859-1", $data); Encode::Encoder->new($data)->iso_8859_1; # OOP way # shortcut use Encode::Encoder qw(encoder); encoder($data)->iso_8859_1; # you can stack them! encoder($data)->iso_8859_1->base64; # provided base64() is defined # you can use it as a decoder as well encoder($base64)->bytes('base64')->latin1; # stringified print encoder($data)->utf8->latin1; # prints the string in latin1 # numified encoder("x{abcd}x{ef}g")->utf8 == 6; # true. bytes::length($data) ABSTRACT
Encode::Encoder allows you to use Encode in an object-oriented style. This is not only more intuitive than a functional approach, but also handier when you want to stack encodings. Suppose you want your UTF-8 string converted to Latin1 then Base64: you can simply say my $base64 = encoder($utf8)->latin1->base64; instead of my $latin1 = encode("latin1", $utf8); my $base64 = encode_base64($utf8); or the lazier and more convoluted my $base64 = encode_base64(encode("latin1", $utf8)); Description Here is how to use this module. o There are at least two instance variables stored in a hash reference, {data} and {encoding}. o When there is no method, it takes the method name as the name of the encoding and encodes the instance data with encoding. If successful, the instance encoding is set accordingly. o You can retrieve the result via ->data but usually you don't have to because the stringify operator ("") is overridden to do exactly that. Predefined Methods This module predefines the methods below: $e = Encode::Encoder->new([$data, $encoding]); returns an encoder object. Its data is initialized with $data if present, and its encoding is set to $encoding if present. When $encoding is omitted, it defaults to utf8 if $data is already in utf8 or "" (empty string) otherwise. encoder() is an alias of Encode::Encoder->new(). This one is exported on demand. $e->data([$data]) When $data is present, sets the instance data to $data and returns the object itself. Otherwise, the current instance data is returned. $e->encoding([$encoding]) When $encoding is present, sets the instance encoding to $encoding and returns the object itself. Otherwise, the current instance encoding is returned. $e->bytes([$encoding]) decodes instance data from $encoding, or the instance encoding if omitted. If the conversion is successful, the instance encoding will be set to "". The name bytes was deliberately picked to avoid namespace tainting -- this module may be used as a base class so method names that appear in Encode::Encoding are avoided. Example: base64 transcoder This module is designed to work with Encode::Encoding. To make the Base64 transcoder example above really work, you could write a module like this: package Encode::Base64; use base 'Encode::Encoding'; __PACKAGE__->Define('base64'); use MIME::Base64; sub encode{ my ($obj, $data) = @_; return encode_base64($data); } sub decode{ my ($obj, $data) = @_; return decode_base64($data); } 1; __END__ And your caller module would be something like this: use Encode::Encoder; use Encode::Base64; # now you can really do the following encoder($data)->iso_8859_1->base64; encoder($base64)->bytes('base64')->latin1; Operator Overloading This module overloads two operators, stringify ("") and numify (0+). Stringify dumps the data inside the object. Numify returns the number of bytes in the instance data. They come in handy when you want to print or find the size of data. SEE ALSO
Encode, Encode::Encoding perl v5.14.2 2011-08-09 Encode::Encoder(3pm)