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#!/usr/bin/env perl

use Modern::Perl;
use File::Find qw(find);
use File::Slurper qw(read_text write_text);
use FindBin;

my $ltc_branch = "develop";
my $ltm_branch = "no-stdint-h";
my $tmpdir = "/tmp/libtom.git.checkout.$$";

warn "update libtommath from github (branch: $ltm_branch)..\n";
system "rm -rf $tmpdir; mkdir $tmpdir";
system "git clone -b $ltm_branch https://github.com/libtom/libtommath.git $tmpdir && cp -R $tmpdir/bn*.c $tmpdir/tom*.h $FindBin::Bin/ltm/ && echo ok";

warn "update libtomcrypt from github (branch: $ltc_branch)..\n";
system "rm -rf $tmpdir; mkdir $tmpdir";
system "git clone -b $ltc_branch https://github.com/libtom/libtomcrypt.git $tmpdir && cp -R $tmpdir/src/* $FindBin::Bin/ltc/ && echo ok";
system "rm -rf $tmpdir";

### another style
#system "wget https://github.com/libtom/libtomcrypt/tarball/$ltc_branch -q -O - | tar xz --wildcards --transform 's,^libtom.*/src/,,' -C '$FindBin::Bin/ltc' 'libtom*/src/*'";
#system "wget https://github.com/libtom/libtommath/tarball/$ltm_branch -q -O - | tar xz --wildcards --transform 's,^libtom.*/,,' -C '$FindBin::Bin/ltm' 'libtom*/bn*.c' 'libtom*/tom*.h'";

warn "gonna remove unwanted..\n";
system 'rm', '-rf', "$FindBin::Bin/ltc/encauth/ocb/";
system 'rm', '-rf', "$FindBin::Bin/ltc/modes/f8/";
system 'rm', '-rf', "$FindBin::Bin/ltc/modes/lrw/";
system 'rm', '-rf', "$FindBin::Bin/ltc/modes/xts/";
system 'rm', '-rf', "$FindBin::Bin/ltc/pk/katja/";
system 'rm', '-rf', "$FindBin::Bin/ltc/math/gmp_desc.c";

### get rid of bn_mp_set_long_long + bn_mp_get_long_long
system 'rm', '-rf', "$FindBin::Bin/ltm/bn_mp_set_long_long.c";
system 'rm', '-rf', "$FindBin::Bin/ltm/bn_mp_get_long_long.c";
system 'sed', '-i', 's,^\(int *mp_set_long_long.*\),/* \1 */,', 'src//ltm/tommath.h';
system 'sed', '-i', 's,^\(unsigned *long *long *mp_get_long_long.*\),/* \1 */,', 'src//ltm/tommath.h';

### MSVC hack required for VC6 compatibility
#  #ifdef _MSC_VER
#  typedef unsigned __int64 mp_word
#  #else
#  typedef unsigned long long mp_word;
#  #endif
system 'sed', '-i', 's,^\(typedef *unsigned *long *long *mp_word;\)$,#ifdef _MSC_VER\ntypedef unsigned __int64 mp_word;\n#else\n\1 /* PATCHED */\n#endif,', 'src//ltm/tommath.h';

find({ wanted=>sub { unlink $_ if -f $_ && $_ =~ /test\.c$/ && $_ !~ /sha3_test.c$/ }, no_chdir=>1 }, "$FindBin::Bin/ltc");
find({ wanted=>sub { unlink $_ if -f $_ && $_ =~ /\.o$/ }, no_chdir=>1 }, "$FindBin::Bin/ltm", "$FindBin::Bin/ltc");

#fix modes
warn "gonna chmod..\n";
find({ wanted=>sub { system "chmod -x $_" if -f $_ && -x $_ && $_ =~ /\.(c|h)/ }, no_chdir=>1 }, "$FindBin::Bin/ltm", "$FindBin::Bin/ltc");
 
my @objs = ();
find({ wanted=>sub { push @objs, $_ if $_ =~ /\.c$/ && $_ !~ /tab\.c$/}, no_chdir=>1 }, "$FindBin::Bin/ltc");
find({ wanted=>sub { push @objs, $_ if $_ =~ /\.c$/ }, no_chdir=>1 }, "$FindBin::Bin/ltm");

my $o   = "OBJS=" . (join " ", map { s/\.c$/.o/r }   map { s!^.*/(ltm|ltc)/!$1/!r } @objs) =~ s/(.{80}) /$1 \\\n/gr;
my $obj = "OBJS=" . (join " ", map { s/\.c$/.obj/r } map { s!^.*/(ltm|ltc)/!$1/!r } @objs) =~ s/(.{80}) /$1 \\\n/gr;

write_text("$FindBin::Bin/Makefile", read_text("$FindBin::Bin/Makefile") =~ s/OBJS=.+?\.o\n/$o\n/sr);
write_text("$FindBin::Bin/Makefile.nmake", read_text("$FindBin::Bin/Makefile.nmake") =~ s/OBJS=.+?\.obj\n/$obj\n/sr);