08-25-2005
Installing External Modem - Details
The fax modem is a US Robotics 28k Faxmodem
The OS is SCO OpenServer Release 5
sco_sv scounix 3.2 5.05 I386
Last edited by trinitygirl71; 08-25-2005 at 05:15 PM..
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LEARN ABOUT DEBIAN
device::modem::protocol::xmodem
Device::Modem::Protocol::Xmodem(3pm) User Contributed Perl Documentation Device::Modem::Protocol::Xmodem(3pm)
NAME
Device::Modem::Protocol::Xmodem
Xmodem::Block
Class that represents a single Xmodem data block.
Synopsis
my $b = Xmodem::Block->new( 1, 'My Data...<until-128-chars>...' );
if( defined $b ) {
# Ok, block instanced, verify its checksum
if( $b->verify( 'checksum', <my_chksum> ) ) {
...
} else {
...
}
} else {
# No block
}
# Calculate checksum, crc16, 32, ...
$crc16 = $b->crc16();
$crc32 = $b->crc32();
$chksm = $b->checksum();
Xmodem::Buffer
Class that implements an Xmodem receive buffer of data blocks. Every block of data is represented by a "Xmodem::Block" object.
Blocks can be pushed and popped from the buffer. You can retrieve the last block, or the list of blocks from buffer.
Synopsis
my $buf = Xmodem::Buffer->new();
my $b1 = Xmodem::Block->new(1, 'Data...');
$buf->push($b1);
my $b2 = Xmodem::Block->new(2, 'More data...');
$buf->push($b2);
my $last_block = $buf->last();
print 'now I have ', scalar($buf->blocks()), ' in the buffer';
# TODO document replace() function ???
Xmodem::Constants
Package that contains all useful Xmodem protocol constants used in handshaking and data blocks encoding procedures
Synopsis
Xmodem::Constants::soh ........... 'start of header'
Xmodem::Constants::eot ........... 'end of trasmission'
Xmodem::Constants::ack ........... 'acknowlegded'
Xmodem::Constants::nak ........... 'not acknowledged'
Xmodem::Constants::can ........... 'cancel'
Xmodem::Constants::C ........... `C' ASCII char
Xmodem::Constants::XMODEM ........ basic xmodem protocol
Xmodem::Constants::XMODEM_1K ..... xmodem protocol with 1k blocks
Xmodem::Constants::XMODEM_CRC .... xmodem protocol with CRC checks
Xmodem::Constants::CHECKSUM ...... type of block checksum
Xmodem::Constants::CRC16 ......... type of block crc16
Xmodem::Constants::CRC32 ......... type of block crc32
Xmodem::Receiver
Control class to initiate and complete a "X-modem" file transfer in receive mode
Synopsis
my $recv = Xmodem::Receiver->new(
modem => {Device::Modem object},
filename => 'name of file',
XXX protocol => 'xmodem' | 'xmodem-crc', | 'xmodem-1k'
);
$recv->run();
Object methods
abort_transfer()
Sends a cancel char ("can"), that signals to sender that transfer is aborted. This is issued if we receive a bad block number, which
usually means we got a bad line.
modem()
Returns the underlying Device::Modem object.
receive_message()
Retreives message from modem and if a block is detected it breaks it into appropriate parts.
run()
Starts a new transfer until file receive is complete. The only parameter accepted is the (optional) local filename to be written.
send_ack()
Sends an acknowledge ("ack") char, to signal that we received and stored a correct block Resets count of timeouts and returns the "Xmo-
dem::Block" object of the data block received.
send_timeout()
Sends a timeout ("nak") char, to signal that we received a bad block header (either a bad start char or a bad block number), or a bad
data checksum. Increments count of timeouts and at ten timeouts, aborts transfer.
See also
- Device::Modem
perl v5.8.8 2005-04-30 Device::Modem::Protocol::Xmodem(3pm)