/[cvs]/nfo/perl/libs/Data/Transfer/Sync/Compare/Checksum.pm
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revision 1.3 by joko, Tue May 13 08:19:00 2003 UTC revision 1.5 by joko, Tue May 11 19:43:02 2004 UTC
# Line 6  Line 6 
6  ##  ##
7  ##    ----------------------------------------------------------------------------------------  ##    ----------------------------------------------------------------------------------------
8  ##    $Log$  ##    $Log$
9    ##    Revision 1.5  2004/05/11 19:43:02  joko
10    ##    don't use File::RsyncP::Digest on win32
11    ##
12    ##    Revision 1.4  2004/05/06 12:53:07  jonen
13    ##    + added use of File::RsycP::digest
14    ##
15  ##    Revision 1.3  2003/05/13 08:19:00  joko  ##    Revision 1.3  2003/05/13 08:19:00  joko
16  ##    switched to crc32  ##    switched to crc32
17  ##  ##
# Line 23  Line 29 
29  =head1 Todo  =head1 Todo
30        
31    o Data::Transfer::Sync::Compare::Slot using Compare::Struct    o Data::Transfer::Sync::Compare::Slot using Compare::Struct
32      o Load checksum algorithm on demand, do some negotiation
33    
34  =cut  =cut
35    
# Line 33  use warnings; Line 40  use warnings;
40    
41  use mixin::with qw( Data::Transfer::Sync );  use mixin::with qw( Data::Transfer::Sync );
42    
43    use shortcuts qw( RUNNING_IN_HELL );
44  use Data::Dumper;  use Data::Dumper;
45    
46  # TODO: Load these appropriatly at runtime.  # TODO: Load these appropriatly at runtime.
47  use Digest::MD5 qw( md5 md5_hex md5_base64 );  use Digest::MD5 qw( md5 md5_hex md5_base64 );
48  use String::CRC32;  use String::CRC32;
49    
50    # don't use File::RsyncP::Digest on win32
51    # TODO: enhance here! (e.g. negotiate proper checksum-algorithm first, apply afterwards)
52    if (not RUNNING_IN_HELL()) {
53      eval "use File::RsyncP::Digest;";
54    }
55    
56  # get logger instance  # get logger instance
57  my $logger = Log::Dispatch::Config->instance;  my $logger = Log::Dispatch::Config->instance;
58    
# Line 74  sub _calcChecksum { Line 87  sub _calcChecksum {
87        # with small payloads already in ranges of hundreds of items/rows!!!        # with small payloads already in ranges of hundreds of items/rows!!!
88        # Try to avoid it or try to use it only for payloads greater than, hmmm, let's say 30 chars?        # Try to avoid it or try to use it only for payloads greater than, hmmm, let's say 30 chars?
89        # (we had about 15 chars average per item (row))        # (we had about 15 chars average per item (row))
90        # Possible (generic) solution: Just generate checksum, if length(checksum(payload)) < payload        # Possible (generic) solution: Just generate checksum, if length(checksum(payload)) < length(payload)
91        #$self->{node}->{$descent}->{checksum} = DBI::hash($dump, 1);        #$self->{node}->{$descent}->{checksum} = DBI::hash($dump, 1);
92                
93      # 3. good ol' crc32???      # 3. good old crc32???
94        $self->{node}->{$descent}->{checksum} = crc32($dump);        #$self->{node}->{$descent}->{checksum} = crc32($dump);
95                
96      # 4. some more modern Digest::SHA1 or similar?      # 4. File::RsyncP::Digest - Perl interface to rsync message digest algorithms
97        if (not RUNNING_IN_HELL()) {
98          my $rsDigest = new File::RsyncP::Digest;
99          $rsDigest->add($dump);
100          my $digest = $rsDigest->digest();
101          $self->{node}->{$descent}->{checksum} = unpack("H*", $digest);
102        
103        } else {    # fallback to Digest::MD5 on win32
104          $self->{node}->{$descent}->{checksum} = md5_base64($dump) . '==';
105        }
106    
107        # 5. some more modern Digest::SHA1 or similar?
108    
109    # signal good    # signal good
110      return 1;      return 1;
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