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+*.pyc
+*~
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diff --git a/LICENSE b/LICENSE
new file mode 100644
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--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
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+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/README b/README
new file mode 100644
index 0000000..ade1cb9
--- /dev/null
+++ b/README
@@ -0,0 +1,44 @@
+LeCrunch version 1.0
+====================
+
+Installation
+------------
+
+You must have h5py, a general-purpose Python interface to the Hierarchical
+Data Format Library version 5 installed. The source can be downloaded from
+<code.google.com/p/h5py>, or on an ubuntu distribution:
+
+~$ sudo apt-get install python-h5py
+
+Then just source the env.sh file in this directory, and you're good to go!
+
+What is LeCrunch?
+-----------------
+
+LeCrunch is a set or libraries and scripts for communicating and extracting
+waveform traces from LeCroy DSO oscilloscopes.
+
+How to use LeCrunch
+-------------------
+
+The syntax to fetch waveforms:
+
+~$ fetch.py <filename> [-n NUMBER OF TRACES] [-r NUMBER OF RUNS]
+
+where <filename> is the name of the file you would like LeCrunch to store the
+extracted waveforms; waveforms are stored in the hdf5 file format.
+
+Documentation
+-------------
+
+Currently, this README file is the only documentation.
+
+Bug Reports
+-----------
+
+Please send bug reports to <telatorre@gmail.com>
+
+That's all folks!
+-----------------
+
+--Anthony LaTorre <telatorre@gmail.com>
\ No newline at end of file
diff --git a/__init__.py b/__init__.py
new file mode 100644
index 0000000..80ccd7c
--- /dev/null
+++ b/__init__.py
@@ -0,0 +1 @@
+from fetch import fetch
diff --git a/config.py b/config.py
new file mode 100755
index 0000000..8df9635
--- /dev/null
+++ b/config.py
@@ -0,0 +1,104 @@
+#!/usr/bin/env python
+# LeCrunch
+# Copyright (C) 2010 Anthony LaTorre 
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"""
+Save/load settings from a LeCroy DSO oscilloscope. Settings are saved as a
+python dictionary in two ways: pickled to a stand-alone file, or attached as
+attributes to a hdf5 file. Settings can be loaded from either source.
+
+Examples:
+    Save/load settings to/from a pickled dictionary.
+    >>> settings.py save mysettings.pkl
+    >>> settings.py load mysettings.pkl
+    sending TIME_DIV
+    sending COMM_FORMAT
+    ...
+
+    Save/load settings from a dataset.
+    >>> fetch.py test.hdf5 -n 100
+    Saving event: 1000
+    Completed 1000 events in 15.302 seconds.
+    Averaged 0.01530 seconds per acquisition.
+    Wrote to file 'test.hdf5'.
+    >>> settings.py load test.hdf5
+    sending TIME_DIV
+    sending COMM_FORMAT
+    ...
+"""
+
+commands = ['TIME_DIV', 'COMM_FORMAT', 'COMM_HEADER', 'COMM_ORDER'] + \
+    ['TRIG_DELAY', 'TRIG_SELECT', 'TRIG_MODE', 'TRIG_PATTERN'] + \
+    ['C%i:COUPLING' % i for i in range(1,5)] + \
+    ['C%i:VOLT_DIV' % i for i in range(1,5)] + \
+    ['C%i:OFFSET' % i for i in range(1,5)] + \
+    ['C%i:TRIG_COUPLING' % i for i in range(1,5)] + \
+    ['C%i:TRIG_LEVEL' % i for i in range(1,5)] + \
+    ['C%i:TRIG_SLOPE' % i for i in range(1,5)] + \
+    ['C%i:TRACE' % i for i in range(1,5)]
+
+def get_settings(scope):
+    settings = {}
+    for command in commands:
+        scope.send(command + '?')
+        settings[command] = scope.recv().strip()
+        scope.check_last_command()
+    return settings
+
+def set_settings(scope, settings):
+    for command, setting in settings.items():
+        print 'sending %s' % command
+        scope.send(setting)
+        scope.check_last_command()
+
+if __name__ == '__main__':
+    import sys
+    import optparse
+    import pickle
+    import h5py
+
+    usage = '%prog <save/load> filename'
+    parser = optparse.OptionParser(usage)
+    options, args = parser.parse_args()
+
+    if len(args) < 2:
+        sys.exit(parser.format_help())
+
+    from scope import Scope
+
+    scope = Scope('scope01.hep.upenn.edu')
+    scope.connect()
+    scope.clear()
+
+    if args[0] == 'save':
+        settings = get_settings(scope)
+        for command, setting in settings.items():
+            print '%s, %s' % (command, setting)
+        f = open(args[1], 'wb')
+        pickle.dump(settings, f)
+        f.close()
+    elif args[0] == 'load':
+        try:
+            f = h5py.File(args[1], 'r')
+            settings = dict(f.attrs)
+            f.close()
+        except h5py.h5e.LowLevelIOError:
+            f = open(args[1], 'r')
+            settings = pickle.load(f)
+            f.close()
+
+        set_settings(scope, settings)
+    else:
+        raise Exception('unrecognized command %s' % args[0])
diff --git a/env.sh b/env.sh
new file mode 100644
index 0000000..b04202d
--- /dev/null
+++ b/env.sh
@@ -0,0 +1,7 @@
+THIS=$(dirname ${BASH_ARGV[0]})
+LECRUNCH=$(cd ${THIS}; pwd)
+export LECRUNCH
+
+# add lecrunch to $PATH and $PYTHONPATH
+export PATH=$LECRUNCH:$PATH
+export PYTHONPATH=$LECRUNCH:$PYTHONPATH
\ No newline at end of file
diff --git a/fetch.py b/fetch.py
new file mode 100755
index 0000000..0db4984
--- /dev/null
+++ b/fetch.py
@@ -0,0 +1,163 @@
+#!/usr/bin/env python
+# LeCrunch
+# Copyright (C) 2010 Anthony LaTorre 
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+import sys
+import time
+import socket
+import struct
+import h5py
+from lecroy import LeCroyScope
+from config import get_settings
+
+def fetch(filename, events):
+    """
+    Fetch and save waveform traces from the oscilloscope.
+
+    Args:
+        - filename: str
+            Filename to store traces in (in hdf5 format).
+        - events: int
+            Number of triggered events to save in `filename`.
+    """
+    scope = LeCroyScope('scope01.hep.upenn.edu')
+    scope.connect()
+
+    # turn off the display
+    scope.send('display off')
+    scope.check_last_command()
+
+    # clear the output queue
+    scope.clear()
+
+    # get active channels
+    channels = scope.getchannels()
+
+    # get scope configuration
+    settings = get_settings(scope)
+
+    # get wave descriptors for each channel
+    # important to do this before queue is primed!
+    wavedesc = {}
+    for channel in channels:
+        wavedesc[channel] = scope.getwavedesc(channel)
+
+    # prime the output queue
+    for i in range(10):
+        scope.trigger()
+        for channel in channels:
+            scope.send('c%i:wf? dat1' % channel)
+
+    # open up the output file
+    f = h5py.File(filename, 'w')
+    # set scope configuration
+    for command, setting in settings.items():
+        f.attrs[command] = setting
+    dataset = {}
+    for channel in channels:
+        samples = wavedesc[channel]['wave_array_count']
+        chunks = (max(1,min(100, events//100)), samples)
+        dataset[channel] = f.create_dataset('channel%i' % channel,
+                                            (events, samples),
+                                            dtype=wavedesc[channel]['dtype'],
+                                            chunks=chunks,
+                                            compression='gzip')
+        for key, value in wavedesc[channel].items():
+            try:
+                dataset[channel].attrs[key] = value
+            except ValueError:
+                pass
+
+    # start a timer
+    time0 = time.time()
+
+    try:
+        for i in range(events):
+            print '\rSaving event: %i' % (i+1),
+            sys.stdout.flush()
+
+            try:
+                scope.trigger()
+                for channel in channels:
+                    dataset[channel][i] = scope.getwaveform(channel,
+                                                            wavedesc[channel])
+            except (socket.error, struct.error, RuntimeError, OverflowError):
+                print "\nFailed to receive waveform %i" % (i+1)
+                # clear the output queue
+                scope.clear()
+                # reprime the queue
+                for i in range(10):
+                    scope.trigger()
+                    for channel in channels:
+                        scope.send('c%i:wf? dat1' % channel)
+                continue
+        print
+    except KeyboardInterrupt:
+        print
+        print 'Resizing datasets...'
+        for channel in channels:
+            dataset[channel].resize((i, wavedesc[channel]['wave_array_count']))
+        raise KeyboardInterrupt
+    finally:
+        f.close()
+        scope.clear()
+        scope.send('display on')
+        scope.check_last_command()
+        scope.close()
+
+        elapsed = time.time() - time0
+
+        print 'Completed %i events in %.3f seconds.' % (i+1, elapsed)
+        print 'Averaged %.5f seconds per acquisition.' % (elapsed/(i+1))
+        print "Wrote to file '%s'." % filename
+
+if __name__ == '__main__':
+    import optparse
+
+    usage = "usage: %prog <filename/prefix> [-n] [-r]"
+    parser = optparse.OptionParser(usage, version="%prog 0.1.0")
+    parser.add_option("-n", type="int", dest="events",
+                      help="number of events to store per run", default=1000)
+    parser.add_option("-r", type="int", dest="runs",
+                      help="number of runs", default=1)
+    parser.add_option("--time", action="store_true", dest="time",
+                      help="append time string to filename", default=False)
+    (options, args) = parser.parse_args()
+
+    if len(args) < 1:
+        sys.exit(parser.format_help())
+    
+    if options.events < 1 or options.runs < 1:
+        sys.exit("Please specify a number >= 1 for number of events/runs")
+
+    if options.runs == 1 and not options.time:
+        fetch(args[0], options.events)
+    else:
+        import time
+        import string
+
+        for i in range(options.runs):
+            timestr = string.replace(time.asctime(time.localtime()), ' ', '-')
+            filename = args[0] + '_' + timestr + '.hdf5'
+            print '-' * 65
+            print 'Saving to file %s' % filename
+            print '-' * 65
+
+            try:
+                fetch(filename, options.events)
+            except KeyboardInterrupt:
+                break
diff --git a/lecroy.py b/lecroy.py
new file mode 100644
index 0000000..31c282e
--- /dev/null
+++ b/lecroy.py
@@ -0,0 +1,223 @@
+# LeCrunch
+# Copyright (C) 2010 Anthony LaTorre 
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import sys
+import re
+import array
+import StringIO
+import struct
+import numpy as np
+import scope
+
+# data types in lecroy binary blocks, where:
+# length  -- byte length of type
+# string  -- string representation of type
+# packfmt -- format string for struct.unpack()
+class String:
+    length = 16
+    string = 'string'
+class Byte:
+    length = 1
+    string = 'byte'
+    packfmt = 'b'
+class Word:
+    length = 2
+    string = 'word'
+    packfmt = 'h'
+class Long:
+    length = 4
+    string = 'long'
+    packfmt = 'l'
+class Enum:
+    length = 2
+    string = 'enum'
+    packfmt = 'h'
+class Float:
+    length = 4
+    string = 'float'
+    packfmt = 'f'
+class Double:
+    length = 8
+    string = 'double'
+    packfmt = 'd'
+class TimeStamp:
+    length = 16
+    string = 'time_stamp'
+    packfmt = 'dbbbbhh'
+class UnitDefinition:
+    length = 48
+    string = 'unit_definition'
+
+# byte length of wavedesc block
+wavedesclength = 346
+
+# template of wavedesc block, where each entry in tuple is:
+# (variable name, byte position from beginning of block, datatype)
+wavedesc_template = ( ('descriptor_name'    , 0   , String),
+                      ('template_name'      , 16  , String),
+                      ('comm_type'          , 32  , Enum),
+                      ('comm_order'         , 34  , Enum),
+                      ('wave_descriptor'    , 36  , Long),
+                      ('user_text'          , 40  , Long),
+                      ('res_desc1'          , 44  , Long),
+                      ('trigtime_array'     , 48  , Long),
+                      ('ris_time_array'     , 52  , Long),
+                      ('res_array1'         , 56  , Long),
+                      ('wave_array_1'       , 60  , Long),
+                      ('wave_array_2'       , 64  , Long),
+                      ('res_array_2'        , 68  , Long),
+                      ('res_array_3'        , 72  , Long),
+                      ('instrument_name'    , 76  , String),
+                      ('instrument_number'  , 92  , Long),
+                      ('trace_label'        , 96  , String),
+                      ('reserved1'          , 112 , Word),
+                      ('reserved2'          , 114 , Word),
+                      ('wave_array_count'   , 116 , Long),
+                      ('pnts_per_screen'    , 120 , Long),
+                      ('first_valid_pnt'    , 124 , Long),
+                      ('last_valid_pnt'     , 128 , Long),
+                      ('first_point'        , 132 , Long),
+                      ('sparsing_factor'    , 136 , Long),
+                      ('segment_index'      , 140 , Long),
+                      ('subarray_count'     , 144 , Long),
+                      ('sweeps_per_acq'     , 148 , Long),
+                      ('points_per_pair'    , 152 , Word),
+                      ('pair_offset'        , 154 , Word),
+                      ('vertical_gain'      , 156 , Float),
+                      ('vertical_offset'    , 160 , Float),
+                      ('max_value'          , 164 , Float),
+                      ('min_value'          , 168 , Float),
+                      ('nominal_bits'       , 172 , Word),
+                      ('nom_subarray_count' , 174 , Word),
+                      ('horiz_interval'     , 176 , Float),
+                      ('horiz_offset'       , 180 , Double),
+                      ('pixel_offset'       , 188 , Double),
+                      ('vertunit'           , 196 , UnitDefinition),
+                      ('horunit'            , 244 , UnitDefinition),
+                      ('horiz_uncertainty'  , 292 , Float),
+                      ('trigger_time'       , 296 , TimeStamp),
+                      ('acq_duration'       , 312 , Float),
+                      ('record_type'        , 316 , Enum),
+                      ('processing_done'    , 318 , Enum),
+                      ('reserved5'          , 320 , Word),
+                      ('ris_sweeps'         , 322 , Word),
+                      ('timebase'           , 324 , Enum),
+                      ('vert_coupling'      , 326 , Enum),
+                      ('probe_att'          , 328 , Float),
+                      ('fixed_vert_gain'    , 332 , Enum),
+                      ('bandwidth_limit'    , 334 , Enum),
+                      ('vertical_vernier'   , 336 , Float),
+                      ('acq_vert_offset'    , 340 , Float),
+                      ('wave_source'        , 344 , Enum) )
+
+class LeCroyScope(scope.Scope):
+    """
+    A class for triggering and fetching waveforms from the oscilloscope.
+
+    .. note::
+
+       You must call connect() on the object before fetching waveforms.
+    """
+    def __init__(self, host, port=1861, timeout=2.0):
+        super(LeCroyScope, self).__init__(host, port, timeout)
+
+    def connect(self):
+        """Connect to the oscilloscope."""
+        super(LeCroyScope, self).connect()
+        # initialize some parameters
+        self.send('comm_header short')
+        self.check_last_command()
+        self.send('comm_format DEF9,BYTE,BIN')
+        self.check_last_command()
+
+    def getchannels(self):
+        """Returns a list of the active channels on the scope."""
+        channels = []
+        for i in range(1, 5):
+            self.send('c%i:trace?' %i)
+            if 'ON' in self.recv():
+                channels.append(i)
+        return channels
+
+    def trigger(self):
+        """Trigger the oscilloscope and wait for an acquisition."""
+        self.send('arm;wait')
+
+    def getwavedesc(self, channel):
+        if channel not in range(1, 5):
+            raise Exception('channel must be in %s.' % str(range(1, 5)))
+
+        self.send('c%s:wf? all' % str(channel))
+
+        msg = self.recv()
+        if not int(msg[1]) == channel:
+            raise RuntimeError('waveforms out of sync or comm_header is off.')
+
+        data = StringIO.StringIO(msg)
+
+        startpos = re.search('WAVEDESC', data.read()).start()
+
+        wavedesc = {}
+
+        # check endian
+        data.seek(startpos + 34)
+        if struct.unpack('<'+Enum.packfmt, data.read(Enum.length)) == 0:
+            endian = '>'
+            wavedesc['little_endian'] = True
+            np.little_endian = True
+        else:
+            endian = '<'
+            wavedesc['little_endian'] = False
+            np.little_endian = False
+
+        data.seek(startpos)
+
+        # build dictionary of wave description
+        for name, pos, datatype in wavedesc_template:
+            raw = data.read(datatype.length)
+            if datatype in (String, UnitDefinition):
+                wavedesc[name] = raw.rstrip('\x00')
+            elif datatype in (TimeStamp,):
+                wavedesc[name] = struct.unpack(endian+datatype.packfmt, raw)
+            else:
+                wavedesc[name] = struct.unpack(endian+datatype.packfmt, raw)[0]
+
+        # determine data type
+        if wavedesc['comm_type'] == 0:
+            wavedesc['dtype'] = np.int8
+        elif wavedesc['comm_type'] == 1:
+            wavedesc['dtype'] = np.int16
+        else:
+            raise Exception('unknown comm_type.')
+            
+        return wavedesc
+
+    def getwaveform(self, channel, wavedesc):
+        """
+        Request, process, and return the x and y arrays for channel number
+        *channel* from the oscilloscope.
+        """ 
+
+        if channel not in range(1, 5):
+            raise Exception('channel must be in %s.' % str(range(1, 5)))
+
+        self.send('c%s:wf? dat1' % str(channel))
+
+        msg = self.recv()
+        if not int(msg[1]) == channel:
+            raise RuntimeError('waveforms out of sync or comm_header is off.')
+
+        return np.fromstring(msg[22:], wavedesc['dtype'], wavedesc['wave_array_count'])
diff --git a/scope.py b/scope.py
new file mode 100644
index 0000000..34438d2
--- /dev/null
+++ b/scope.py
@@ -0,0 +1,136 @@
+#!/usr/bin/env python
+# LeCrunch
+# Copyright (C) 2010 Anthony LaTorre 
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import struct
+import socket
+import os
+
+headerformat = '>BBBBL'
+
+errors = { 1 : 'unrecognized command/query header',
+           2 : 'illegal header path',
+           3 : 'illegal number',
+           4 : 'illegal number suffix',
+           5 : 'unrecognized keyword',
+           6 : 'string error',
+           7 : 'GET embedded in another message',
+           10 : 'arbitrary data block expected',
+           11 : 'non-digit character in byte count field of ' \
+                'arbitrary data block',
+           12 : 'EOI detected during definite length data block transfer',
+           13 : 'extra bytes detected during definite length data block ' \
+                'transfer' }
+
+class Scope(object):
+    """
+    A class for low level communication with the oscilliscope over a socket
+    connection.
+    """
+    def __init__(self, host, port=1861, timeout=2.0):
+        """Create a socket object to *host* over *port*"""
+        self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+        self.sock.settimeout(timeout)
+        self.host = host
+        self.port = port
+        self.timeout = timeout
+
+    def settimeout(self, timeout):
+        """Set the *timeout* for the socket connection in seconds."""
+        self.sock.settimeout(timeout)
+        self.timeout = timeout
+        
+    def connect(self):
+        """Make the socket connection."""
+        self.sock.connect((self.host, self.port))
+
+    def clear(self):
+        """Clear the oscilloscope's output queue."""
+        self.sock.settimeout(2.0)
+        try:
+            while True:
+                self.sock.recv(100)
+        except socket.timeout:
+            pass
+        self.sock.settimeout(self.timeout)
+
+    def close(self):
+        """Close the socket connection."""
+        self.sock.close()
+
+    def send(self, str):
+        """Format and send the string *str*."""
+        if not str.endswith('\n'):
+            str += '\n'
+        header = struct.pack(headerformat, 129, 1, 1, 0, len(str))
+        self.sock.sendall(header + str)
+
+    def check_last_command(self):
+        """
+        Check that the last command sent was received okay; if not, then
+        raise an exception with details about the error.
+        """
+        self.send('cmr?')
+        err = int(self.recv().split(' ')[-1].rstrip('\n'))
+
+        if err in errors:
+            self.close()
+            raise Exception(errors[err])
+
+    def getheader(self):
+        """
+        Unpacks a header string from the oscilloscope into the tuple
+        (operation, header version, sequence number, spare, total bytes).
+        """
+        return struct.unpack(headerformat, self.sock.recv(8))
+
+    def recv(self):
+        """
+        Receive, concatenate, and return a 'logical series' of blocks from
+        the oscilloscope. A 'logical series' consists of one or more blocks
+        in which the final block is terminated by an EOI terminator
+        (i.e. the EOI bit in the header block is set to '1').
+        """
+        reply = ''
+        while True:
+            operation, headerver, seqnum, spare, totalbytes  = self.getheader()
+
+            buffer = ''
+
+            while len(buffer) < totalbytes:
+                buffer += self.sock.recv(totalbytes - len(buffer))
+
+            reply += buffer
+
+            if operation % 2:
+                break
+            
+        return reply
+
+if __name__ == '__main__':
+    import sys
+    scope = Scope('scope01.hep.upenn.edu')
+    scope.connect()
+    scope.clear()
+
+    for msg in sys.argv[1:]:
+        scope.send(msg)
+        if '?' in msg:
+            print repr(scope.recv())
+
+        scope.check_last_command()
+
+    scope.close()
diff --git a/view.py b/view.py
new file mode 100755
index 0000000..7c465e2
--- /dev/null
+++ b/view.py
@@ -0,0 +1,59 @@
+#!/usr/bin/env python
+# LeCrunch
+# Copyright (C) 2010 Anthony LaTorre 
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+import sys
+import numpy as np
+import h5py
+from ROOT import *
+gROOT.SetStyle('Plain')
+
+import optparse
+parser = optparse.OptionParser('%prog file')
+parser.add_option('-n', type='int', dest='events', default=500)
+options, args = parser.parse_args()
+
+f = h5py.File(sys.argv[1], 'r')
+
+mg = {}
+for dataset in [f[name] for name in f]:
+    mg[dataset.name] = TMultiGraph()
+
+    samples = dataset.attrs['wave_array_count']
+    dx = dataset.attrs['horiz_interval']
+    dy = dataset.attrs['vertical_gain']
+    xoffset = dataset.attrs['horiz_offset']
+    yoffset = dataset.attrs['vertical_offset']
+
+    x = np.linspace(xoffset, xoffset + dx*samples, samples)
+
+    for i, waveform in enumerate(dataset[:min(options.events, len(dataset))]):
+        print '\rreading waveform: %i' % (i+1),
+        sys.stdout.flush()
+
+        y = waveform.astype(np.float64)*dy - yoffset
+
+        mg[dataset.name].Add(TGraph(len(x), x, y))
+    print
+
+c = TCanvas('c', '', 800, 600)
+c.Divide(1, len(mg))
+for i, key in enumerate(mg):
+    c.cd(i+1)
+    mg[key].SetTitle(';Time (s);Amplitude (V)')
+    mg[key].Draw('AL')
+    c.cd(i+1).Update()
+
+raw_input('press enter')