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package IO::Framed::Read; |
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171835
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use strict; |
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use warnings; |
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2004
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use IO::Framed::X (); |
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2009
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sub new { |
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my ( $class, $in_fh, $initial_buffer ) = @_; |
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if ( !defined $initial_buffer ) { |
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$initial_buffer = q<>; |
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} |
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my $self = { |
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_in_fh => $in_fh, |
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_read_buffer => $initial_buffer, |
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_bytes_to_read => 0, |
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}; |
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return bless $self, $class; |
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} |
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sub get_read_fh { return $_[0]->{'_in_fh'} } |
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#---------------------------------------------------------------------- |
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# IO subclass interface |
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sub allow_empty_read { |
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my ($self) = @_; |
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$self->{'_ALLOW_EMPTY_READ'} = 1; |
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return $self; |
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} |
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sub READ { |
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require IO::SigGuard; |
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1193
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*READ = *IO::SigGuard::sysread; |
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goto &READ; |
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} |
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#We assume here that whatever read may be incomplete at first |
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#will eventually be repeated so that we can complete it. e.g.: |
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# |
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# - read 4 bytes, receive 1, cache it - return undef |
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# - select() |
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# - read 4 bytes again; since we already have 1 byte, only read 3 |
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# … and now we get the remaining 3, so return the buffer. |
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# |
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sub read { |
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my ( $self, $bytes ) = @_; |
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die "I refuse to read zero!" if !$bytes; |
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100
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if ( length $self->{'_read_buffer'} ) { |
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1
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if ( length($self->{'_read_buffer'}) + $self->{'_bytes_to_read'} != $bytes ) { |
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0
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my $should_be = length($self->{'_read_buffer'}) + $self->{'_bytes_to_read'}; |
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die "Continuation: should want “$should_be” bytes, not $bytes!"; |
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} |
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} |
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if ( $bytes > length($self->{'_read_buffer'}) ) { |
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$bytes -= length($self->{'_read_buffer'}); |
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local $!; |
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local $self->{'_return'}; |
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$bytes -= $self->_expand_read_buffer( $bytes ); |
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return q<> if $self->{'_return'}; |
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} |
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$self->{'_bytes_to_read'} = $bytes; |
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100
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if ($bytes) { |
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2
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return undef; |
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} |
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5
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return substr( $self->{'_read_buffer'}, 0, length($self->{'_read_buffer'}), q<> ); |
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} |
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sub _expand_read_buffer { |
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return $_[0]->can('READ')->( $_[0]->{'_in_fh'}, $_[0]->{'_read_buffer'}, $_[1], length($_[0]->{'_read_buffer'}) ) || do { |
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if ($!) { |
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4
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4
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if ( !$!{'EAGAIN'} && !$!{'EWOULDBLOCK'}) { |
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5558
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4
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39
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86
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die IO::Framed::X->create( 'ReadError', $! ); |
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} |
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} |
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elsif ($_[0]->{'_ALLOW_EMPTY_READ'}) { |
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$_[0]->{'_return'} = 1; |
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0; |
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} |
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else { |
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die IO::Framed::X->create('EmptyRead'); |
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} |
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}; |
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} |
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sub read_until { |
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my ( $self, $seq ) = @_; |
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if ( $self->{'_bytes_to_read'} ) { |
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0
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die "Don’t call read_until() after an incomplete read()!"; |
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} |
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die "Missing read-until sequence!" if !defined $seq || !length $seq; |
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108
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my $at = index( $self->{'_read_buffer'}, $seq ); |
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110
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5
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100
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if ($at > -1) { |
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1
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return substr( $self->{'_read_buffer'}, 0, $at + length($seq), q<> ); |
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} |
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4
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local $self->{'_return'}; |
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4
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$self->_expand_read_buffer( 65536 ); |
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3
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return q<> if $self->{'_return'}; |
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2
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$at = index( $self->{'_read_buffer'}, $seq ); |
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2
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100
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if ($at > -1) { |
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1
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return substr( $self->{'_read_buffer'}, 0, $at + length($seq), q<> ); |
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} |
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1
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return undef; |
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} |
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129
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#---------------------------------------------------------------------- |
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1; |