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# Copyright (C) 2011-2013 MURATA Yasuhisa
# This program is free software; you can redistribute it and/or
# modify it under the same terms as Perl itself.
package MIME::EcoEncode::JP_B;
use strict;
use warnings;
our $VERSION = '0.95';
use MIME::Base64;
use constant TAIL => '?=';
our $HEAD; # head string
our $HTL; # head + tail length
our $LF; # line feed
our $BPL; # bytes per line
# add encoded-word for "B" encoding and 7bit-jis string
# parameters:
# sp : start position (indentation of the first line)
# ep : end position of last line (call by reference)
# rll : room of last line (default: 0)
# fof : flag to check size-over at the first time
sub add_ew_jp_b {
my ($str, $sp, $ep, $rll, $fof) = @_;
return '' if $str eq '';
# encoded size + sp
my $ep_v = int((length($str) + 2) / 3) * 4 + $HTL + $sp;
if ($ep_v + $rll <= $BPL) {
$$ep = $ep_v;
return $HEAD . encode_base64($str, '') . TAIL;
}
my $ll_flag = ($ep_v <= $BPL) ? 1 : 0;
my $k_in = 0; # ascii: 0, zen: 1 or 2, han: 9
my $k_in_bak = -1;
my $k_out;
my $ec;
my $w1;
my $w1_bak = '';
my $w = '';
my $w_len;
my $w_bak = '';
my $chunk;
my $chunk_len;
my $result = '';
my $ep_str;
my $max_len = int(($BPL - $HTL - $sp) / 4) * 3;
my $max_len2 = int(($BPL - $HTL - 1) / 4) * 3;
my $max_len3 = int(($BPL - $HTL - 1 - $rll) / 4) * 3;
while ($str =~ /(\e(..)|.)/g) {
($w1, $ec) = ($1, $2);
$w .= $w1;
if (defined $ec) {
$w1_bak = $w1;
if ($ec eq '(B') {
$k_in = 0;
}
elsif ($ec eq '$B') {
$k_in = 1;
}
else {
$k_in = 9;
}
next;
}
else {
if ($k_in == 1) {
$k_in = 2;
next;
}
elsif ($k_in == 2) {
$k_in = 1;
}
}
$k_out = $k_in ? 3 : 0; # 3 is "\e\(B"
if (pos($str) + $k_out > $max_len) {
$w_len = length($w);
if ($k_in_bak < 0) { # size over at the first time
$result = ' ';
return $result if $fof;
}
else {
if ($k_in_bak) {
$chunk = $w_bak .
substr($str, 0, pos($str) - $w_len, "") . "\e\(B";
if ($k_in) {
if ($k_in_bak == $k_in) {
$w = $w1_bak . $w;
}
}
else {
$w = $w1;
}
}
else {
$chunk = $w_bak . substr($str, 0, pos($str) - $w_len, "");
}
$result .= $HEAD . encode_base64($chunk, '') . TAIL . "$LF ";
}
substr($str, 0, $w_len, "");
$chunk_len = length($str) + length($w);
if ($chunk_len <= $max_len3) {
$chunk = $w . $str;
last;
}
$ll_flag = 1 if $chunk_len <= $max_len2;
$w_bak = $w;
$max_len = $max_len2 - length($w_bak);
}
else {
if ($ll_flag and pos($str) + $k_out == length($str)) { # last char
if ($k_in_bak < 0) { # size over at the first time
$result = ' ';
return $result if $fof;
}
else {
if ($k_in_bak) {
$chunk = $w_bak .
substr($str, 0, pos($str) - length($w), "") .
"\e\(B";
if ($k_in) {
if ($k_in_bak == $k_in) {
$w = $w1_bak . $w;
}
}
else {
$w = $w1;
}
}
else {
$chunk = $w_bak .
substr($str, 0, pos($str) - length($w), "");
}
$result .= $HEAD
. encode_base64($chunk, '') . TAIL . "$LF ";
}
$chunk = $k_out ? $w . "\e\(B" : $w;
last;
}
}
$k_in_bak = $k_in;
$w = '';
}
$ep_str = $HEAD . encode_base64($chunk, '') . TAIL;
$$ep = length($ep_str) + 1;
return $result . $ep_str;
}
1;
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