qb-bithelp

Functions for viewing and understanding binary encodings.

Complies with the 100% test coverage and minimum dependency requirements of qb-standard .

Install:

npm install qb-bithelp

Usage

utfinfo( string_or_code_points, options )

Print hex/bit information for a raw (code-point), UTF-8, and UTF-16 encodings.

string_or_code_points: a single UTF code point (integer), an array of code points, or a string
options:
    log:   (default is console.log) set this to a function (takes single string input) to provide your own logger to capture output.
         

To highlight special cases, utfinfo only prints the 'interesting' stuff. That is, it will print UTF-8 only if it is different from the code-point (e.g. non-ascii) and will print UTF-16 only if it is different from UTF-8 ()has hi/lo surrogates).

Again, utfinfo() takes a variety of inputs - array of code points, single code-point or string:

var bhelp = require('qb-bithelp');

bhelp.utfinfo('e',                  'simple ascii');
bhelp.utfinfo('\u00E6',             'a ligature');
bhelp.utfinfo([ 0x10009, 0x10010 ], 'large (4-byte) characters' );
bhelp.utfinfo('做法方。',            'some chinese');

... gives the output:

==============================================================================
1 code point for " e ", simple ascii
    -----------
    (1/1) " e ":
    point :  00.00.00.65 | 0000 0000 : 0000 0000 : 0000 0000 : 0110 0101
    -----------
==============================================================================
1 code point for " æ ", a ligature
    -----------
    (1/1) " æ ":
    point :  00.00.00.E6 | 0000 0000 : 0000 0000 : 0000 0000 : 1110 0110
    utf8  :  00.00.C3.A6 | 0000 0000 : 0000 0000 : 1100 0011 : 1010 0110
    -----------
==============================================================================
2 code points for " 𐀉𐀐 ", large (4-byte) characters
    -----------
    (1/2) " 𐀉 ":
    point :  00.01.00.09 | 0000 0000 : 0000 0001 : 0000 0000 : 0000 1001
    utf8  :  F0.90.80.89 | 1111 0000 : 1001 0000 : 1000 0000 : 1000 1001
    utf16 :  D8.00.DC.09 | 1101 1000 : 0000 0000 : 1101 1100 : 0000 1001
    -----------
    (2/2) " 𐀐 ":
    point :  00.01.00.10 | 0000 0000 : 0000 0001 : 0000 0000 : 0001 0000
    utf8  :  F0.90.80.90 | 1111 0000 : 1001 0000 : 1000 0000 : 1001 0000
    utf16 :  D8.00.DC.10 | 1101 1000 : 0000 0000 : 1101 1100 : 0001 0000
    -----------
==============================================================================
4 code points for " 做法方。 ", some chinese
    -----------
    (1/4) " 做 ":
    point :  00.00.50.5A | 0000 0000 : 0000 0000 : 0101 0000 : 0101 1010
    utf8  :  00.E5.81.9A | 0000 0000 : 1110 0101 : 1000 0001 : 1001 1010
    -----------
    (2/4) " 法 ":
    point :  00.00.6C.D5 | 0000 0000 : 0000 0000 : 0110 1100 : 1101 0101
    utf8  :  00.E6.B3.95 | 0000 0000 : 1110 0110 : 1011 0011 : 1001 0101
    -----------
    (3/4) " 方 ":
    point :  00.00.65.B9 | 0000 0000 : 0000 0000 : 0110 0101 : 1011 1001
    utf8  :  00.E6.96.B9 | 0000 0000 : 1110 0110 : 1001 0110 : 1011 1001
    -----------
    (4/4) " 。 ":
    point :  00.00.30.02 | 0000 0000 : 0000 0000 : 0011 0000 : 0000 0010
    utf8  :  00.E3.80.82 | 0000 0000 : 1110 0011 : 1000 0000 : 1000 0010
    -----------

Note that if you see quoted " ????? " or similar output in your browser or editor, it is because it doesn't handle those characters correctly. A viewer that supports encodings will show characters.

bitinfo( string_or_code_points, options )

Takes same types of input and options as utfinfo() but just prints the raw code-point information:

var bhelp = require('qb-bithelp');

bhelp.bitinfo( 'abcé',                  'simple string');
bhelp.bitinfo( '\u00E6',                'a ligature');
bhelp.bitinfo( [ 0x10009, 0x10010 ],    'large (4-byte) characters' );
bhelp.bitinfo( '做法方便上手。',          'some chinese' );

... gives the output:

point :  00.00.00.61 | 0000 0000 : 0000 0000 : 0000 0000 : 0110 0001 | " a " : simple string
point :  00.00.00.62 | 0000 0000 : 0000 0000 : 0000 0000 : 0110 0010 | " b " : simple string
point :  00.00.00.63 | 0000 0000 : 0000 0000 : 0000 0000 : 0110 0011 | " c " : simple string
point :  00.00.00.E9 | 0000 0000 : 0000 0000 : 0000 0000 : 1110 1001 | " é " : simple string
point :  00.00.00.E6 | 0000 0000 : 0000 0000 : 0000 0000 : 1110 0110 | " æ " : a ligature
point :  00.01.00.09 | 0000 0000 : 0000 0001 : 0000 0000 : 0000 1001 | " 𐀉 " : large (4-byte) characters
point :  00.01.00.10 | 0000 0000 : 0000 0001 : 0000 0000 : 0001 0000 | " 𐀐 " : large (4-byte) characters
point :  00.00.50.5A | 0000 0000 : 0000 0000 : 0101 0000 : 0101 1010 | " 做 " : some chinese
point :  00.00.6C.D5 | 0000 0000 : 0000 0000 : 0110 1100 : 1101 0101 | " 法 " : some chinese
point :  00.00.65.B9 | 0000 0000 : 0000 0000 : 0110 0101 : 1011 1001 | " 方 " : some chinese
point :  00.00.4F.BF | 0000 0000 : 0000 0000 : 0100 1111 : 1011 1111 | " 便 " : some chinese
point :  00.00.4E.0A | 0000 0000 : 0000 0000 : 0100 1110 : 0000 1010 | " 上 " : some chinese
point :  00.00.62.4B | 0000 0000 : 0000 0000 : 0110 0010 : 0100 1011 | " 手 " : some chinese
point :  00.00.30.02 | 0000 0000 : 0000 0000 : 0011 0000 : 0000 0010 | " 。 " : some chinese