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File Name : Packet.pm

package Git::Packet;
use 5.008001;
use strict;
use warnings $ENV{GIT_PERL_FATAL_WARNINGS} ? qw(FATAL all) : ();
BEGIN {
	require Exporter;
	if ($] < 5.008003) {
		*import = \&Exporter::import;
	} else {
		# Exporter 5.57 which supports this invocation was
		# released with perl 5.8.3
		Exporter->import('import');
	}
}

our @EXPORT = qw(
			packet_compare_lists
			packet_bin_read
			packet_txt_read
			packet_key_val_read
			packet_bin_write
			packet_txt_write
			packet_flush
			packet_initialize
			packet_read_capabilities
			packet_read_and_check_capabilities
			packet_check_and_write_capabilities
		);
our @EXPORT_OK = @EXPORT;

sub packet_compare_lists {
	my ($expect, @result) = @_;
	my $ix;
	if (scalar @$expect != scalar @result) {
		return undef;
	}
	for ($ix = 0; $ix < $#result; $ix++) {
		if ($expect->[$ix] ne $result[$ix]) {
			return undef;
		}
	}
	return 1;
}

sub packet_bin_read {
	my $buffer;
	my $bytes_read = read STDIN, $buffer, 4;
	if ( $bytes_read == 0 ) {
		# EOF - Git stopped talking to us!
		return ( -1, "" );
	} elsif ( $bytes_read != 4 ) {
		die "invalid packet: '$buffer'";
	}
	my $pkt_size = hex($buffer);
	if ( $pkt_size == 0 ) {
		return ( 1, "" );
	} elsif ( $pkt_size > 4 ) {
		my $content_size = $pkt_size - 4;
		$bytes_read = read STDIN, $buffer, $content_size;
		if ( $bytes_read != $content_size ) {
			die "invalid packet ($content_size bytes expected; $bytes_read bytes read)";
		}
		return ( 0, $buffer );
	} else {
		die "invalid packet size: $pkt_size";
	}
}

sub remove_final_lf_or_die {
	my $buf = shift;
	if ( $buf =~ s/\n$// ) {
		return $buf;
	}
	die "A non-binary line MUST be terminated by an LF.\n"
	    . "Received: '$buf'";
}

sub packet_txt_read {
	my ( $res, $buf ) = packet_bin_read();
	if ( $res != -1 and $buf ne '' ) {
		$buf = remove_final_lf_or_die($buf);
	}
	return ( $res, $buf );
}

# Read a text packet, expecting that it is in the form "key=value" for
# the given $key.  An EOF does not trigger any error and is reported
# back to the caller (like packet_txt_read() does).  Die if the "key"
# part of "key=value" does not match the given $key, or the value part
# is empty.
sub packet_key_val_read {
	my ( $key ) = @_;
	my ( $res, $buf ) = packet_txt_read();
	if ( $res == -1 or ( $buf =~ s/^$key=// and $buf ne '' ) ) {
		return ( $res, $buf );
	}
	die "bad $key: '$buf'";
}

sub packet_bin_write {
	my $buf = shift;
	print STDOUT sprintf( "%04x", length($buf) + 4 );
	print STDOUT $buf;
	STDOUT->flush();
}

sub packet_txt_write {
	packet_bin_write( $_[0] . "\n" );
}

sub packet_flush {
	print STDOUT sprintf( "%04x", 0 );
	STDOUT->flush();
}

sub packet_initialize {
	my ($name, $version) = @_;

packet_compare_lists([0, $name . "-client"], packet_txt_read()) ||
		die "bad initialize";
	packet_compare_lists([0, "version=" . $version], packet_txt_read()) ||
		die "bad version";
	packet_compare_lists([1, ""], packet_bin_read()) ||
		die "bad version end";

packet_txt_write( $name . "-server" );
	packet_txt_write( "version=" . $version );
	packet_flush();
}

sub packet_read_capabilities {
	my @cap;
	while (1) {
		my ( $res, $buf ) = packet_bin_read();
		if ( $res == -1 ) {
			die "unexpected EOF when reading capabilities";
		}
		return ( $res, @cap ) if ( $res != 0 );
		$buf = remove_final_lf_or_die($buf);
		unless ( $buf =~ s/capability=// ) {
			die "bad capability buf: '$buf'";
		}
		push @cap, $buf;
	}
}

# Read remote capabilities and check them against capabilities we require
sub packet_read_and_check_capabilities {
	my @required_caps = @_;
	my ($res, @remote_caps) = packet_read_capabilities();
	my %remote_caps = map { $_ => 1 } @remote_caps;
	foreach (@required_caps) {
		unless (exists($remote_caps{$_})) {
			die "required '$_' capability not available from remote" ;
		}
	}
	return %remote_caps;
}

# Check our capabilities we want to advertise against the remote ones
# and then advertise our capabilities
sub packet_check_and_write_capabilities {
	my ($remote_caps, @our_caps) = @_;
	foreach (@our_caps) {
		unless (exists($remote_caps->{$_})) {
			die "our capability '$_' is not available from remote"
		}
		packet_txt_write( "capability=" . $_ );
	}
	packet_flush();
}

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-06-03 10:31:32
..	dir	-	root/root	0755	2025-06-04 01:30:30
I18N.pm	text/plain	2.75 KB	root/root	0644	2025-06-03 03:21:07
IndexInfo.pm	text/plain	848 B	root/root	0644	2025-06-03 03:21:07
Packet.pm	text/plain	4.08 KB	root/root	0644	2025-06-03 03:21:07

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