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1
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package Data::ParseBinary::Stream::Reader;
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2
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5
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5
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28
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use strict;
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5
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8
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5
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186
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3
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5
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5
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27
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use warnings;
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5
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8
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5
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6508531
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4
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5
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sub _readBitsForByteStream {
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6
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9
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9
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12
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my ($self, $bitcount) = @_;
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7
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9
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50
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32
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my $count = int($bitcount / 8) + ($bitcount % 8 ? 1 : 0);
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8
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9
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24
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my $data = $self->ReadBytes($count);
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9
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9
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25
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my $fullbits = unpack "B*", $data;
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10
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9
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18
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my $string = substr($fullbits, -$bitcount);
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11
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9
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23
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return $string;
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12
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}
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13
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14
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sub _readBytesForBitStream {
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15
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2
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2
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6
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my ($self, $count) = @_;
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16
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2
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7
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my $bitData = $self->ReadBits($count * 8);
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17
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2
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8
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my $data = pack "B*", $bitData;
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18
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2
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7
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return $data;
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19
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}
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20
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21
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0
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0
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0
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sub isBitStream { die "unimplemented" }
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22
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0
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0
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0
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sub ReadBytes { die "unimplemented" }
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23
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0
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0
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0
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sub ReadBits { die "unimplemented" }
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24
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0
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0
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0
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sub seek { die "unimplemented" }
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25
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0
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0
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0
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sub tell { die "unimplemented" }
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26
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27
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our %_streamTypes;
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28
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29
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sub _registerStreamType {
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30
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35
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35
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66
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my ($class, $typeName) = @_;
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31
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35
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146
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$_streamTypes{$typeName} = $class;
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32
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}
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33
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34
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sub CreateStreamReader {
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35
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191
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191
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6270614
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my @params = @_;
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36
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191
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50
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576
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if (@params == 0) {
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37
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0
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0
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die "CreateStreamReader: mush have a parameter";
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38
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}
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39
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191
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100
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461
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if (@params == 1) {
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40
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140
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201
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my $source = $params[0];
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41
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140
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100
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33
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654
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if (not defined $source or not ref $source) {
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42
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# some value (string?). let's feed it to StringStreamWriter
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43
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112
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624
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return $_streamTypes{String}->new($source);
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44
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}
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45
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28
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50
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131
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if (UNIVERSAL::isa($source, "Data::ParseBinary::Stream::Reader")) {
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46
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28
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83
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return $source;
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47
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}
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48
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0
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0
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die "Got unknown input to CreateStreamReader";
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49
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}
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50
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51
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# @params > 1
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52
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51
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80
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my $source = pop @params;
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53
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51
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121
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while (@params) {
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54
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52
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71
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my $opts = undef;
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55
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52
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86
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my $type = pop @params;
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56
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52
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50
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66
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287
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if ( defined( ref $type ) and @params and ( $params[-1] eq ' Opts' ) ) {
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66
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57
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0
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0
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$opts = $type;
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58
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0
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0
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$type = pop @params;
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59
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}
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60
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52
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50
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159
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if (not exists $_streamTypes{$type}) {
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61
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0
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0
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die "CreateStreamReader: Unrecognized type: $type";
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62
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}
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63
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52
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379
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$source = $_streamTypes{$type}->new($source, $opts);
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64
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}
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65
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51
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182
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return $source;
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66
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}
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67
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68
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sub DESTROY {
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69
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166
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166
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1199
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my $self = shift;
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70
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166
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100
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1723
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if ($self->can("disconnect")) {
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71
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35
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83
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$self->disconnect();
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72
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}
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73
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}
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74
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75
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package Data::ParseBinary::Stream::Writer;
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76
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77
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0
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0
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0
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sub WriteBytes { die "unimplemented" }
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78
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0
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0
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0
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sub WriteBits { die "unimplemented" }
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79
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0
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0
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0
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sub Flush { die "unimplemented" }
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80
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0
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0
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0
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sub isBitStream { die "unimplemented" }
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81
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0
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0
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0
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sub seek { die "unimplemented" }
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82
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0
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0
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0
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sub tell { die "unimplemented" }
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83
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84
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sub _writeBitsForByteStream {
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85
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9
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9
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12
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my ($self, $bitdata) = @_;
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86
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9
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10
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my $data_len = length($bitdata);
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87
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9
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12
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my $zeros_to_add = (-$data_len) % 8;
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88
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9
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28
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my $binary = pack "B".($zeros_to_add + $data_len), ('0'x$zeros_to_add).$bitdata;
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89
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9
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27
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return $self->WriteBytes($binary);
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90
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}
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91
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92
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sub _writeBytesForBitStream {
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93
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2
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2
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5
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my ($self, $data) = @_;
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94
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2
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5
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my $bitdata = unpack "B*", $data;
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95
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2
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8
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return $self->WriteBits($bitdata);
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96
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}
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97
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98
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our %_streamTypes;
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99
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100
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sub _registerStreamType {
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101
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35
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35
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59
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my ($class, $typeName) = @_;
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102
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35
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98
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$_streamTypes{$typeName} = $class;
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103
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}
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104
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105
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sub CreateStreamWriter {
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106
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163
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163
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338
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my @params = @_;
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107
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163
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50
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509
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if (@params == 0) {
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108
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0
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0
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return $_streamTypes{String}->new();
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109
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}
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110
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163
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100
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399
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if (@params == 1) {
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111
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129
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177
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my $source = $params[0];
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112
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129
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100
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66
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414
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if (not defined $source or not ref $source) {
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113
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# some value (string?). let's feed it to StringStreamWriter
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114
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117
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2157
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return $_streamTypes{String}->new($source);
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115
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}
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116
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12
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50
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41
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if (UNIVERSAL::isa($source, "Data::ParseBinary::Stream::Writer")) {
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117
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12
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31
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return $source;
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118
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}
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119
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0
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0
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die "Got unknown input to CreateStreamWriter";
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120
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}
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121
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122
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# @params > 1
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123
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34
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71
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my $source = pop @params;
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124
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34
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254
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while (@params) {
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125
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66
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102
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my $type = pop @params;
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126
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66
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50
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169
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if (not exists $_streamTypes{$type}) {
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127
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0
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0
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die "CreateStreamWriter: Unrecognized type: $type";
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128
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}
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129
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66
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374
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$source = $_streamTypes{$type}->new($source);
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130
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}
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131
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34
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87
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return $source;
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132
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}
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133
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134
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sub DESTROY {
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135
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198
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198
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743
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my $self = shift;
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136
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198
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575
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$self->Flush();
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137
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198
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100
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1732
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if ($self->can("disconnect")) {
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138
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62
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123
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$self->disconnect();
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139
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}
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140
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}
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141
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142
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package Data::ParseBinary::Stream::WrapperBase;
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143
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# this is a nixin class for streams that will warp other streams
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144
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145
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sub _warping {
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146
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97
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97
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133
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my ($self, $sub_stream) = @_;
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147
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97
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50
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233
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if ($sub_stream->{is_warped}) {
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148
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0
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0
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die "Wrapping Stream " . ref($self) . ": substream is already wraped!";
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149
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}
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150
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97
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258
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$self->{ss} = $sub_stream;
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151
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97
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243
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$sub_stream->{is_wraped} = 1;
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152
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}
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153
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154
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sub ss {
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155
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0
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0
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0
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my $self = shift;
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156
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0
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0
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return $self->{ss};
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157
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}
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158
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159
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sub disconnect {
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160
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97
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97
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123
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my ($self) = @_;
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161
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97
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158
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$self->{ss}->{is_wraped} = 0;
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162
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97
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616
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$self->{ss} = undef;
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163
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}
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164
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165
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1; |