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# You may distribute under the terms of either the GNU General Public License |
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# or the Artistic License (the same terms as Perl itself) |
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# |
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# (C) Paul Evans, 2013 -- leonerd@leonerd.org.uk |
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package Protocol::CassandraCQL::Frame; |
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use strict; |
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use warnings; |
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our $VERSION = '0.11'; |
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use Carp; |
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use Encode qw( encode_utf8 decode_utf8 ); |
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use Socket qw( AF_INET AF_INET6 ); |
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# TODO: At least the lower-level methods of this class should be rewritten in |
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# efficient XS code |
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=head1 NAME |
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C - a byte buffer storing the content of a CQL message frame |
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=head1 DESCRIPTION |
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This class provides wire-protocol encoding and decoding support for |
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constructing and parsing Cassandra CQL message frames. An object represents a |
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buffer during construction or parsing. |
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To construct a message frame, create a new empty object and use the C |
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methods to append data to it, before eventually obtaining the actual frame |
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bytes using C. Each C method returns the frame object, allowing |
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them to be easily chained: |
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my $bytes = Protocol::CassandraCQL::Frame->new |
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->pack_short( 123 ) |
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->pack_int( 45678 ) |
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->pack_string( "here is the data" ) |
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->bytes; |
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To parse a message frame, create a new object from the bytes in the message, |
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and use the C methods to consume the values from it. |
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my $frame = Protocol::CassandraCQL::Frame->new( $bytes ); |
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my $s = $frame->unpack_short; |
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my $i = $frame->unpack_int; |
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my $str = $frame->unpack_string; |
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=cut |
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=head1 CONSTRUCTOR |
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=head2 $frame = Protocol::CassandraCQL::Frame->new( $bytes ) |
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Returns a new frame buffer, optionally initialised with the given byte string. |
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=cut |
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sub new |
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{ |
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my $class = shift; |
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my $bytes = ""; |
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$bytes = $_[0] if defined $_[0]; |
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bless \$bytes, $class; |
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} |
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=head1 METHODS |
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=cut |
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# Legacy back-compat methods |
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# DO NOT USE THESE - see Protocol::CassandraCQL::parse_frame and ::build_frame instead |
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sub parse |
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{ |
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shift; # class |
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my ( $version, $flags, $id, $opcode, $body ) = Protocol::CassandraCQL::parse_frame( $_[0] ) |
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or return; |
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return ( $version, $flags, $id, $opcode, Protocol::CassandraCQL::Frame->new( $body ) ); |
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} |
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sub build |
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{ |
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my $self = shift; |
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return Protocol::CassandraCQL::build_frame( @_[0..3], $self->bytes ); |
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} |
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=head2 $bytes = $frame->bytes |
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Returns the byte string currently in the buffer. |
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=cut |
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sub bytes { ${$_[0]} } |
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=head2 $frame->pack_byte( $v ) |
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=head2 $v = $frame->unpack_byte |
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Add or remove a byte value. |
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=cut |
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sub pack_byte { my ( $self, $v ) = @_; |
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$$self .= pack "C", $v; |
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$self } |
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sub unpack_byte { my ( $self ) = @_; |
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unpack "C", substr $$self, 0, 1, "" } |
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=head2 $frame->pack_short( $v ) |
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=head2 $v = $frame->unpack_short |
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Add or remove a short value. |
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=cut |
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sub pack_short { my ( $self, $v ) = @_; |
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$$self .= pack "S>", $v; |
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$self } |
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sub unpack_short { my ( $self ) = @_; |
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unpack "S>", substr $$self, 0, 2, "" } |
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=head2 $frame->pack_int( $v ) |
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=head2 $v = $frame->unpack_int |
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Add or remove an int value. |
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=cut |
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sub pack_int { my ( $self, $v ) = @_; |
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$$self .= pack "l>", $v; |
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$self } |
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sub unpack_int { my ( $self ) = @_; |
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unpack "l>", substr $$self, 0, 4, "" } |
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=head2 $frame->pack_string( $v ) |
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=head2 $v = $frame->unpack_string |
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Add or remove a string value. |
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=cut |
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sub pack_string { my ( $self, $v ) = @_; |
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my $b = encode_utf8( $v ); |
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$self->pack_short( length $b ); |
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$$self .= $b; |
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$self } |
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sub unpack_string { my ( $self ) = @_; |
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my $l = $self->unpack_short; |
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decode_utf8( substr $$self, 0, $l, "" ) } |
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=head2 $frame->pack_lstring( $v ) |
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=head2 $v = $frame->unpack_lstring |
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Add or remove a long string value. |
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=cut |
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sub pack_lstring { my ( $self, $v ) = @_; |
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my $b = encode_utf8( $v ); |
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$self->pack_int( length $b ); |
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$$self .= $b; |
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$self } |
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sub unpack_lstring { my ( $self ) = @_; |
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my $l = $self->unpack_int; |
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decode_utf8( substr $$self, 0, $l, "" ) } |
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=head2 $frame->pack_uuid( $v ) |
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=head2 $v = $frame->unpack_uuid |
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Add or remove a UUID as a plain 16-byte raw scalar |
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=cut |
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sub pack_uuid { my ( $self, $v ) = @_; |
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$$self .= pack "a16", $v; |
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$self } |
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sub unpack_uuid { my ( $self ) = @_; |
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substr $$self, 0, 16, "" } |
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=head2 $frame->pack_string_list( $v ) |
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=head2 $v = $frame->unpack_string_list |
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Add or remove a list of strings from or to an ARRAYref |
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193
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=cut |
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sub pack_string_list { my ( $self, $v ) = @_; |
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$self->pack_short( scalar @$v ); |
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$self->pack_string($_) for @$v; |
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$self } |
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sub unpack_string_list { my ( $self ) = @_; |
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my $n = $self->unpack_short; |
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[ map { $self->unpack_string } 1 .. $n ] } |
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202
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203
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=head2 $frame->pack_bytes( $v ) |
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205
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=head2 $v = $frame->unpack_bytes |
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207
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Add or remove opaque bytes or C. |
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209
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=cut |
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211
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8
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1
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19
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sub pack_bytes { my ( $self, $v ) = @_; |
212
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100
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if( defined $v ) { $self->pack_int( length $v ); $$self .= $v } |
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213
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4
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else { $self->pack_int( -1 ) } |
214
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8
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27
|
$self } |
215
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19
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19
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1
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30
|
sub unpack_bytes { my ( $self ) = @_; |
216
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19
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51
|
my $l = $self->unpack_int; |
217
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19
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100
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133
|
$l > 0 ? substr $$self, 0, $l, "" : undef } |
218
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219
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=head2 $frame->pack_short_bytes( $v ) |
220
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221
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=head2 $v = $frame->unpack_short_bytes |
222
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223
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Add or remove opaque short bytes. |
224
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225
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=cut |
226
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227
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26
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26
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1
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132
|
sub pack_short_bytes { my ( $self, $v ) = @_; |
228
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26
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62
|
$self->pack_short( length $v ); |
229
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26
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36
|
$$self .= $v; |
230
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26
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66
|
$self } |
231
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17
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17
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1
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90
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sub unpack_short_bytes { my ( $self ) = @_; |
232
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17
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36
|
my $l = $self->unpack_short; |
233
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17
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67
|
substr $$self, 0, $l, "" } |
234
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235
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=head2 $frame->pack_inet( $v ) |
236
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237
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=head2 $v = $frame->unpack_inet |
238
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239
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|
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Add or remove an IPv4 or IPv6 address from or to a packed sockaddr string |
240
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(such as returned from C or C. |
241
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242
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=cut |
243
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244
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2
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2
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1
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33
|
sub pack_inet { my ( $self, $v ) = @_; |
245
|
2
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|
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|
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9
|
my $family = Socket::sockaddr_family($v); |
246
|
2
|
100
|
|
|
|
8
|
if ( $family == AF_INET ) { $$self .= "\x04"; $self->_pack_inet4( $v ) } |
|
1
|
50
|
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3
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1
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5
|
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247
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1
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2
|
elsif( $family == AF_INET6 ) { $$self .= "\x10"; $self->_pack_inet6( $v ) } |
|
1
|
|
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|
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4
|
|
248
|
0
|
|
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|
|
0
|
else { croak "Expected AF_INET or AF_INET6 address" } |
249
|
2
|
|
|
|
|
6
|
$self } |
250
|
3
|
|
|
3
|
1
|
28
|
sub unpack_inet { my ( $self ) = @_; |
251
|
3
|
|
|
|
|
11
|
my $addrlen = unpack "C", substr $$self, 0, 1, ""; |
252
|
3
|
100
|
|
|
|
11
|
if ( $addrlen == 4 ) { $self->_unpack_inet4 } |
|
2
|
50
|
|
|
|
8
|
|
253
|
1
|
|
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|
|
3
|
elsif( $addrlen == 16 ) { $self->_unpack_inet6 } |
254
|
0
|
|
|
|
|
0
|
else { croak "Expected address length 4 or 16" } } |
255
|
|
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|
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|
|
|
256
|
|
|
|
|
|
|
# AF_INET |
257
|
1
|
|
|
1
|
|
2
|
sub _pack_inet4 { my ( $self, $v ) = @_; |
258
|
1
|
|
|
|
|
11
|
my ( $port, $addr ) = Socket::unpack_sockaddr_in( $v ); |
259
|
1
|
|
|
|
|
3
|
$$self .= $addr; $self->pack_int( $port ) } |
|
1
|
|
|
|
|
4
|
|
260
|
2
|
|
|
2
|
|
4
|
sub _unpack_inet4 { my ( $self ) = @_; |
261
|
2
|
|
|
|
|
7
|
my $addr = substr $$self, 0, 4, ""; |
262
|
2
|
|
|
|
|
12
|
Socket::pack_sockaddr_in( $self->unpack_int, $addr ) } |
263
|
|
|
|
|
|
|
|
264
|
|
|
|
|
|
|
# AF_INET6 |
265
|
1
|
|
|
1
|
|
2
|
sub _pack_inet6 { my ( $self, $v ) = @_; |
266
|
1
|
|
|
|
|
4
|
my ( $port, $addr ) = Socket::unpack_sockaddr_in6( $v ); |
267
|
1
|
|
|
|
|
2
|
$$self .= $addr; $self->pack_int( $port ) } |
|
1
|
|
|
|
|
2
|
|
268
|
1
|
|
|
1
|
|
2
|
sub _unpack_inet6 { my ( $self ) = @_; |
269
|
1
|
|
|
|
|
2
|
my $addr = substr $$self, 0, 16, ""; |
270
|
1
|
|
|
|
|
3
|
Socket::pack_sockaddr_in6( $self->unpack_int, $addr ) } |
271
|
|
|
|
|
|
|
|
272
|
|
|
|
|
|
|
=head2 $frame->pack_string_map( $v ) |
273
|
|
|
|
|
|
|
|
274
|
|
|
|
|
|
|
=head2 $v = $frame->unpack_string_map |
275
|
|
|
|
|
|
|
|
276
|
|
|
|
|
|
|
Add or remove a string map from or to a HASH of strings. |
277
|
|
|
|
|
|
|
|
278
|
|
|
|
|
|
|
=cut |
279
|
|
|
|
|
|
|
|
280
|
|
|
|
|
|
|
# Don't strictly need to sort the keys but it's nice for unit testing |
281
|
4
|
|
|
4
|
1
|
15
|
sub pack_string_map { my ( $self, $v ) = @_; |
282
|
4
|
|
|
|
|
45
|
$self->pack_short( scalar keys %$v ); |
283
|
4
|
|
|
|
|
47
|
$self->pack_string( $_ ), $self->pack_string( $v->{$_} ) for sort keys %$v; |
284
|
4
|
|
|
|
|
35
|
$self } |
285
|
1
|
|
|
1
|
1
|
6
|
sub unpack_string_map { my ( $self ) = @_; |
286
|
1
|
|
|
|
|
3
|
my $n = $self->unpack_short; |
287
|
1
|
|
|
|
|
4
|
+{ map { $self->unpack_string => $self->unpack_string } 1 .. $n } } |
|
2
|
|
|
|
|
20
|
|
288
|
|
|
|
|
|
|
|
289
|
|
|
|
|
|
|
=head2 $frame->pack_string_multimap( $v ) |
290
|
|
|
|
|
|
|
|
291
|
|
|
|
|
|
|
=head2 $v = $frame->unpack_string_multimap |
292
|
|
|
|
|
|
|
|
293
|
|
|
|
|
|
|
Add or remove a string multimap from or to a HASH of ARRAYs of strings. |
294
|
|
|
|
|
|
|
|
295
|
|
|
|
|
|
|
=cut |
296
|
|
|
|
|
|
|
|
297
|
1
|
|
|
1
|
1
|
9
|
sub pack_string_multimap { my ( $self, $v ) = @_; |
298
|
1
|
|
|
|
|
5
|
$self->pack_short( scalar keys %$v ); |
299
|
1
|
|
|
|
|
5
|
$self->pack_string( $_ ), $self->pack_string_list( $v->{$_} ) for sort keys %$v; |
300
|
1
|
|
|
|
|
3
|
$self } |
301
|
2
|
|
|
2
|
1
|
8
|
sub unpack_string_multimap { my ( $self ) = @_; |
302
|
2
|
|
|
|
|
8
|
my $n = $self->unpack_short; |
303
|
2
|
|
|
|
|
7
|
+{ map { $self->unpack_string => $self->unpack_string_list } 1 .. $n } } |
|
3
|
|
|
|
|
25
|
|
304
|
|
|
|
|
|
|
|
305
|
|
|
|
|
|
|
=head1 SPONSORS |
306
|
|
|
|
|
|
|
|
307
|
|
|
|
|
|
|
This code was paid for by |
308
|
|
|
|
|
|
|
|
309
|
|
|
|
|
|
|
=over 2 |
310
|
|
|
|
|
|
|
|
311
|
|
|
|
|
|
|
=item * |
312
|
|
|
|
|
|
|
|
313
|
|
|
|
|
|
|
Perceptyx L |
314
|
|
|
|
|
|
|
|
315
|
|
|
|
|
|
|
=item * |
316
|
|
|
|
|
|
|
|
317
|
|
|
|
|
|
|
Shadowcat Systems L |
318
|
|
|
|
|
|
|
|
319
|
|
|
|
|
|
|
=back |
320
|
|
|
|
|
|
|
|
321
|
|
|
|
|
|
|
=head1 AUTHOR |
322
|
|
|
|
|
|
|
|
323
|
|
|
|
|
|
|
Paul Evans |
324
|
|
|
|
|
|
|
|
325
|
|
|
|
|
|
|
=cut |
326
|
|
|
|
|
|
|
|
327
|
|
|
|
|
|
|
0x55AA; |