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.\" ========================================================================
.\"
.IX Title "Business::BR::CNPJ 3pm"
.TH Business::BR::CNPJ 3pm "2022-10-13" "perl v5.34.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Business::BR::CNPJ \- Perl module to test for correct CNPJ numbers
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  use Business::BR::CNPJ; 
\&
\&  print "ok " if test_cnpj(\*(Aq90.117.749/7654\-80\*(Aq); # prints \*(Aqok \*(Aq
\&  print "bad " unless test_cnpj(\*(Aq88.222.111/0001\-10\*(Aq); # prints \*(Aqbad \*(Aq
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \s-1CNPJ\s0 number is an identification number of Brazilian companies
emitted by the Brazilian Ministry of Revenue, which is called
\&\*(L"Ministério da Fazenda\*(R".
.PP
\&\s-1CNPJ\s0 stands for \*(L"Cadastro Nacional de Pessoa Jurídica\*(R" (literally,
national juridical person registration) as opposed to the \s-1CPF\s0 number 
for natural persons. Sometime ago, it was called \s-1CGC\s0 (\*(L"Cadastro Geral
de Contribuinte\*(R" or general taxpayer registration).
.PP
The \s-1CNPJ\s0 is comprised of a base of 8 digits, a 4\-digits radical 
and 2 check digits. It is usually written like '11.111.111/0001\-55' 
so as to be more human-readable.
.PP
This module provides \f(CW\*(C`test_cnpj\*(C'\fR for checking that a \s-1CNPJ\s0 number
is \fIcorrect\fR. Here a \fIcorrect \s-1CNPJ\s0 number\fR means
.IP "\(bu" 4
it is 14 digits long
.IP "\(bu" 4
it satisfies the two check equations mentioned below
.PP
Before checking, any non-digit letter is stripped, making it
easy to test formatted entries like '11.111.111/0001\-55' and
entries with extra blanks like '   43.337.004 / 0001\-72  '.
.IP "\fBtest_cnpj\fR" 4
.IX Item "test_cnpj"
.Vb 3
\&  test_cnpj(\*(Aq48.999.764/0001\-60\*(Aq) # incorrect CPF, returns 0
\&  test_cnpj(\*(Aq 43.337.004/0001\-72 \*(Aq) # is ok, returns 1
\&  test_cnpj(\*(Aq888\*(Aq) # nope, returns undef
.Ve
.Sp
Tests whether a \s-1CNPJ\s0 number is correct. Before testing,
any non-digit character is stripped. Then it is
expected to be 14 digits long and to satisfy two
check equations which validate the last two check digits.
See \*(L"\s-1THE CHECK EQUATIONS\*(R"\s0.
.Sp
The policy to get rid of '.', '/' and '\-' is very liberal. 
It indeeds discards anything that is not a digit (0, 1, ..., 9)
or letter. That is handy for discarding spaces as well.
.Sp
.Vb 1
\&  test_cnpj(\*(Aq 66.818.021/0001\-27 \*(Aq) # is ok, returns 1
.Ve
.Sp
But extraneous inputs like 'a53##045%4\-20**0001!50' are
also accepted. If you are worried about this kind of input,
just check against a regex:
.Sp
.Vb 2
\&  warn "bad CNPJ: only digits (14) expected" 
\&    unless ($cnpj =~ /^\ed{14}$/);
\&
\&  warn "bad CNPJ: does not match mask \*(Aq_\|_._\|_\|_._\|_\|_/_\|_\|_\|_\-_\|_\*(Aq" 
\&    unless ($cnpj =~ /^\ed{2}\e.\ed{3}\e.\ed{3}/\ed{4}\-\ed{2}$/);
.Ve
.Sp
\&\s-1NOTE.\s0 Integer numbers like 3337004000158 (or 3_337_004_0001_58) 
with fewer than 14 digits will be normalized (eg. to
03_337_004_0001_58) before testing.
.IP "\fBcanon_cnpj\fR" 4
.IX Item "canon_cnpj"
.Vb 2
\&  canon_cnpj(1); # returns \*(Aq00000000000001\*(Aq
\&  canon_cnpj(\*(Aq99.999.222/0001\-12\*(Aq); # returns \*(Aq99999222000112\*(Aq
.Ve
.Sp
Canon's a candidate for a \s-1CNPJ\s0 number. In case,
the argument is an integer, it is formatted to at least
fourteen digits. Otherwise, it is stripped of any non-alphanumeric
characters and returned as it is.
.IP "\fBformat_cnpj\fR" 4
.IX Item "format_cnpj"
.Vb 1
\&  format_cnpj(\*(Aq00 000 000 0000 00\*(Aq); # returns \*(Aq00.000.000/0000\-00\*(Aq
.Ve
.Sp
Formats its input into '00.000.000/0000\-00' mask.
First, the argument is canon'ed and then
dots, slash and hyphen are added to the first
14 digits of the result.
.IP "\fBparse_cnpj\fR" 4
.IX Item "parse_cnpj"
.Vb 2
\&  ($base, $filial, $dv) = parse_cnpj($cpf);
\&  $hashref = parse_cnpj(\*(Aq11.222.333/4444\-00\*(Aq); # { base => \*(Aq11222333\*(Aq, filial => \*(Aq4444\*(Aq dv => \*(Aq00\*(Aq }
.Ve
.Sp
Splits a candidate for \s-1CNPJ\s0 number into base, radical and check
digits (dv \- dígitos de verificação). It canon's
the argument before splitting it into 8\-, 4\- and 2\-digits
parts. In a list context,
returns a three-element list with the base, the radical and the check
digits. In a scalar context, returns a hash ref
with keys 'base', 'filial' and 'dv' and associated values.
.IP "\fBrandom_cnpj\fR" 4
.IX Item "random_cnpj"
.Vb 1
\&  $rand_cnpj = random_cnpj($valid);
\&
\&  $good_cnpj = random_cnpj();
\&  $cnpj = random_cnpj(1); # also a good one
\&  $bad_cnpj = random_cnpj(0); # bad CNPJ
.Ve
.Sp
Generates a random \s-1CNPJ.\s0 If \f(CW$valid\fR is omitted or 1, it is guaranteed
to be \fIcorrect\fR. If \f(CW$valid\fR is 0, it is guaranteed to be \fIincorrect\fR.
This function is intented for mass test. (Use it wisely.)
.Sp
The implementation is: generate a 8\-digits random number for the base,
and the variation is chosen 95% of the time to be '0001'
and the other 5% a skewed random distribution with the expression
\&\f(CW\*(C`int(sqr rand(1E8))\*(C'\fR is used. A uniform distribution is expected from
\&\f(CW\*(C`rand\*(C'\fR. With the base and variation, the check digits are computed.
If \f(CW$valid\fR==0, the check digits are computed \fBnot to\fR satisfy the
check equations.
.SS "\s-1EXPORT\s0"
.IX Subsection "EXPORT"
\&\f(CW\*(C`test_cnpj\*(C'\fR is exported by default. \f(CW\*(C`canon_cnpj\*(C'\fR, \f(CW\*(C`format_cnpj\*(C'\fR,
\&\f(CW\*(C`parse_cnpj\*(C'\fR and \f(CW\*(C`random_cnpj\*(C'\fR can be exported on demand.
.SH "THE CHECK EQUATIONS"
.IX Header "THE CHECK EQUATIONS"
A correct \s-1CNPJ\s0 number has two check digits which are computed
from the 12 first digits. Consider the \s-1CNPJ\s0 number 
written as 14 digits
.PP
.Vb 1
\&  c[1] c[2] c[3] c[4] c[5] c[6] c[7] c[8] c[9] c[10] c[11] c[12] dv[1] dv[2]
.Ve
.PP
To check whether a \s-1CNPJ\s0 is correct or not, it has to satisfy 
the check equations:
.PP
.Vb 4
\&  5*c[1]+4*c[2]+3*c[3]+2*c[4]+9*c[5]+
\&  8*c[6]+7*c[7]+6*c[8]+5*c[9]+4*c[10]+
\&                      3*c[11]+2*c[12]+dv[1] = 0 (mod 11) or
\&                                            = 1 (mod 11) (if dv[1]=0)
.Ve
.PP
and
.PP
.Vb 4
\&  6*c[1]+5*c[2]+4*c[3]+3*c[4]+2*c[5]+
\&  9*c[6]+8*c[7]+7*c[8]+6*c[9]+5*c[10]+
\&              4*c[11]+3*c[12]+2*dv[1]+dv[2] = 0 (mod 11) or
\&                                            = 1 (mod 11) (if dv[2]=0)
.Ve
.SH "BUGS"
.IX Header "BUGS"
I heard that there are exceptions of \s-1CNPJ\s0 numbers which don't
obey the check equations and are still authentic. I have never found
one of them.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
To make sure this module works, one can try the results obtained against 
those found with  \*(L"Emissão de Comprovante de Inscrição e de Situação Cadastral
de Pessoa Jurídica\*(R", 
a web page which the Brazilian Ministry of Revenue provides for public 
consultation on regularity status of the taxpayer.
This page tells if the \s-1CNPJ\s0 number is a correct entry (14\-digits\-long with verified
check digits), if it references a real company and if it is regular
with the government body.
.PP
Given a bad \s-1CNPJ,\s0 the after-submit page tells \*(L"O número do \s-1CNPJ\s0 não é válido\*(R"
(the \s-1CNPJ\s0 number is not valid).
If the \s-1CNPJ\s0 is a good one but does not reference a real company,
it says \*(L"\s-1CNPJ\s0 não existe em nossa base de dados\*(R" (\s-1CNPJ\s0 does not exist
in our database). Otherwise, it shows a details form for the identified
taxpayer.
.PP
Note that this module only tests correctness.
It doesn't enter the merit whether the \s-1CNPJ\s0 number actually exists
at the Brazilian government databases.
.PP
As you might have guessed, this is not the first Perl module
to approach this kind of functionality. Take a look at
.PP
.Vb 1
\&  http://search.cpan.org/search?module=Brasil::Checar::CGC
.Ve
.PP
Please reports bugs via \s-1CPAN RT,\s0 
http://rt.cpan.org/NoAuth/Bugs.html?Dist=Business\-BR\-Ids
By doing so, the author will receive your reports and patches, 
as well as the problem and solutions will be documented.
.SH "AUTHOR"
.IX Header "AUTHOR"
A. R. Ferreira, <ferreira@cpan.org>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
Copyright (C) 2005 by A. R. Ferreira
.PP
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself, either Perl version 5.8.6 or,
at your option, any later version of Perl 5 you may have available.
.SH "POD ERRORS"
.IX Header "POD ERRORS"
Hey! \fBThe above document had some coding errors, which are explained below:\fR
.IP "Around line 112:" 4
.IX Item "Around line 112:"
Non-ASCII character seen before =encoding in '"Ministério'. Assuming \s-1CP1252\s0