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# -*- coding: utf-8 -*- 

""" 

SH bindings to ObsPy core module. 

 

:copyright: 

    The ObsPy Development Team (devs@obspy.org) 

:license: 

    GNU Lesser General Public License, Version 3 

    (http://www.gnu.org/copyleft/lesser.html) 

""" 

 

from StringIO import StringIO 

from obspy import Stream, Trace, UTCDateTime 

from obspy.core import Stats 

from obspy.core.util import loadtxt 

import numpy as np 

import os 

 

 

MONTHS = ['JAN', 'FEB', 'MAR', 'APR', 'MAY', 'JUN', 'JUL', 'AUG', 'SEP', 

          'OCT', 'NOV', 'DEC'] 

 

SH_IDX = { 

    'LENGTH': 'L001', 

    'SIGN': 'I011', 

    'EVENTNO': 'I012', 

    'MARK': 'I014', 

    'DELTA': 'R000', 

    'CALIB': 'R026', 

    'DISTANCE': 'R011', 

    'AZIMUTH': 'R012', 

    'SLOWNESS': 'R018', 

    'INCI': 'R013', 

    'DEPTH': 'R014', 

    'MAGNITUDE': 'R015', 

    'LAT': 'R016', 

    'LON': 'R017', 

    'SIGNOISE': 'R022', 

    'PWDW': 'R023', 

    'DCVREG': 'R024', 

    'DCVINCI': 'R025', 

    'COMMENT': 'S000', 

    'STATION': 'S001', 

    'OPINFO': 'S002', 

    'FILTER': 'S011', 

    'QUAL': 'S012', 

    'COMP': 'C000', 

    'CHAN1': 'C001', 

    'CHAN2': 'C002', 

    'BYTEORDER': 'C003', 

    'START': 'S021', 

    'P-ONSET': 'S022', 

    'S-ONSET': 'S023', 

    'ORIGIN': 'S024' 

} 

 

STANDARD_ASC_HEADERS = ['START', 'COMP', 'CHAN1', 'CHAN2', 'STATION', 'CALIB'] 

 

SH_KEYS_INT = [k for (k, v) in SH_IDX.iteritems() if v.startswith('I')] 

SH_KEYS_FLOAT = [k for (k, v) in SH_IDX.iteritems() if v.startswith('R')] 

INVERTED_SH_IDX = dict([(v, k) for (k, v) in SH_IDX.iteritems()]) 

 

 

def isASC(filename): 

    """ 

    Checks whether a file is a Seismic Handler ASCII file or not. 

 

    :type filename: str 

    :param filename: Name of the ASCII file to be checked. 

    :rtype: bool 

    :return: ``True`` if a Seismic Handler ASCII file. 

 

    .. rubric:: Example 

 

    >>> isASC("/path/to/QFILE-TEST-ASC.ASC")  #doctest: +SKIP 

    True 

    """ 

    # first six chars should contain 'DELTA:' 

    try: 

        temp = open(filename, 'rb').read(6) 

    except: 

        return False 

    if temp != 'DELTA:': 

        return False 

    return True 

 

 

def readASC(filename, headonly=False, skip=0, delta=None, length=None, 

                                                  **kwargs):  # @UnusedVariable 

    """ 

    Reads a Seismic Handler ASCII file and returns an ObsPy Stream object. 

 

    .. warning:: 

        This function should NOT be called directly, it registers via the 

        ObsPy :func:`~obspy.core.stream.read` function, call this instead. 

 

    :type filename: str 

    :param filename: ASCII file to be read. 

    :type headonly: bool, optional 

    :param headonly: If set to True, read only the head. This is most useful 

        for scanning available data in huge (temporary) data sets. 

    :type skip: int, optional 

    :param skip: Number of lines to be skipped from top of file. If defined 

        only one trace is read from file. 

    :type delta: float, optional 

    :param delta: If "skip" is used, "delta" defines sample offset in seconds. 

    :type length: int, optional 

    :param length: If "skip" is used, "length" defines the number of values to 

        be read. 

    :rtype: :class:`~obspy.core.stream.Stream` 

    :return: A ObsPy Stream object. 

 

    .. rubric:: Example 

 

    >>> from obspy import read 

    >>> st = read("/path/to/QFILE-TEST-ASC.ASC") 

    >>> st  # doctest: +ELLIPSIS 

    <obspy.core.stream.Stream object at 0x...> 

    >>> print(st)  # doctest: +ELLIPSIS 

    3 Trace(s) in Stream: 

    .TEST..BHN | 2009-10-01T12:46:01.000000Z - ... | 20.0 Hz, 801 samples 

    .TEST..BHE | 2009-10-01T12:46:01.000000Z - ... | 20.0 Hz, 801 samples 

    .WET..HHZ  | 2010-01-01T01:01:05.999000Z - ... | 100.0 Hz, 4001 samples 

    """ 

    fh = open(filename, 'rt') 

    # read file and split text into channels 

    channels = [] 

    headers = {} 

    data = StringIO() 

    for line in fh.readlines()[skip:]: 

        if line.isspace(): 

            # blank line 

            # check if any data fetched yet 

            if len(headers) == 0 and data.len == 0: 

                continue 

            # append current channel 

            data.seek(0) 

            channels.append((headers, data)) 

            # create new channel 

            headers = {} 

            data = StringIO() 

            if skip: 

                # if skip is set only one trace is read, everything else makes 

                # no sense. 

                break 

            continue 

        elif line[0].isalpha(): 

            # header entry 

            key, value = line.split(':', 1) 

            key = key.strip() 

            value = value.strip() 

            headers[key] = value 

        elif not headonly: 

            # data entry - may be written in multiple columns 

            data.write(line.strip() + ' ') 

    fh.close() 

    # create ObsPy stream object 

    stream = Stream() 

    # custom header 

    custom_header = {} 

    if delta: 

        custom_header["delta"] = delta 

    if length: 

        custom_header["npts"] = length 

 

    for headers, data in channels: 

        # create Stats 

        header = Stats(custom_header) 

        header['sh'] = {} 

        channel = [' ', ' ', ' '] 

        # generate headers 

        for key, value in headers.iteritems(): 

            if key == 'DELTA': 

                header['delta'] = float(value) 

            elif key == 'LENGTH': 

                header['npts'] = int(value) 

            elif key == 'CALIB': 

                header['calib'] = float(value) 

            elif key == 'STATION': 

                header['station'] = value 

            elif key == 'COMP': 

                channel[2] = value[0] 

            elif key == 'CHAN1': 

                channel[0] = value[0] 

            elif key == 'CHAN2': 

                channel[1] = value[0] 

            elif key == 'START': 

                # 01-JAN-2009_01:01:01.0 

                # 1-OCT-2009_12:46:01.000 

                header['starttime'] = toUTCDateTime(value) 

            else: 

                # everything else gets stored into sh entry 

                if key in SH_KEYS_INT: 

                    header['sh'][key] = int(value) 

                elif key in SH_KEYS_FLOAT: 

                    header['sh'][key] = float(value) 

                else: 

                    header['sh'][key] = value 

        # set channel code 

        header['channel'] = ''.join(channel) 

        if headonly: 

            # skip data 

            stream.append(Trace(header=header)) 

        else: 

            # read data 

            data = loadtxt(data, dtype='float32', ndlim=1) 

 

            # cut data if requested 

            if skip and length: 

                data = data[:length] 

 

            # use correct value in any case 

            header["npts"] = len(data) 

 

            stream.append(Trace(data=data, header=header)) 

    return stream 

 

 

def writeASC(stream, filename, included_headers=None, npl=4, 

             custom_format="%-.6e", append=False, 

             **kwargs):  # @UnusedVariable 

    """ 

    Writes a Seismic Handler ASCII file from given ObsPy Stream object. 

 

    .. warning:: 

        This function should NOT be called directly, it registers via the 

        the :meth:`~obspy.core.stream.Stream.write` method of an 

        ObsPy :class:`~obspy.core.stream.Stream` object, call this instead. 

 

    :type stream: :class:`~obspy.core.stream.Stream` 

    :param stream: The ObsPy Stream object to write. 

    :type filename: str 

    :param filename: Name of the ASCII file to write. 

    :type npl: int, optional 

    :param npl: Number of data columns in file, default to four. 

    :type included_headers: list or None, optional 

    :param included_headers: If set to a list, only these header entries will 

        be written to file. DELTA and LENGTH are written in any case. If it's 

        set to None, a basic set will be included. 

    :type custom_format: string, optional 

    :param custom_format: Parameter for number formatting of samples, defaults 

        to "%-.6e". 

    :type append: bool, optional 

    :param append: If filename exists append all data to file, default False. 

    """ 

    if included_headers is None: 

        included_headers = STANDARD_ASC_HEADERS 

 

    if append: 

        fh = open(filename, 'ab') 

    else: 

        fh = open(filename, 'wb') 

    for trace in stream: 

        # write headers 

        fh.write("DELTA: %-.6e\n" % (trace.stats.delta)) 

        fh.write("LENGTH: %d\n" % trace.stats.npts) 

        # additional headers 

        for key, value in trace.stats.get('sh', {}).iteritems(): 

            if included_headers and key not in included_headers: 

                continue 

            fh.write("%s: %s\n" % (key, value)) 

        # special format for start time 

        if "START" in included_headers: 

            dt = trace.stats.starttime 

            fh.write("START: %s\n" % fromUTCDateTime(dt)) 

        # component must be split 

        if len(trace.stats.channel) > 2 and "COMP" in included_headers: 

            fh.write("COMP: %c\n" % trace.stats.channel[2]) 

        if len(trace.stats.channel) > 0 and "CHAN1" in included_headers: 

            fh.write("CHAN1: %c\n" % trace.stats.channel[0]) 

        if len(trace.stats.channel) > 1 and "CHAN2" in included_headers: 

            fh.write("CHAN2: %c\n" % trace.stats.channel[1]) 

        if "STATION" in included_headers: 

            fh.write("STATION: %s\n" % trace.stats.station) 

        if "CALIB" in included_headers: 

            fh.write("CALIB: %-.6e\n" % (trace.stats.calib)) 

        # write data in npl columns 

        mask = ([''] * (npl - 1)) + ['\n'] 

        delimiter = mask * ((trace.stats.npts / npl) + 1) 

        delimiter = delimiter[:trace.stats.npts - 1] 

        delimiter.append('\n') 

        for (sample, delim) in zip(trace.data, delimiter): 

            value = custom_format % (sample) 

            fh.write("%s %s" % (value, delim)) 

        fh.write("\n") 

    fh.close() 

 

 

def isQ(filename): 

    """ 

    Checks whether a file is a Seismic Handler Q file or not. 

 

    :type filename: str 

    :param filename: Name of the Q file to be checked. 

    :rtype: bool 

    :return: ``True`` if a Seismic Handler Q file. 

 

    .. rubric:: Example 

 

    >>> isQ("/path/to/QFILE-TEST.QHD")  #doctest: +SKIP 

    True 

    """ 

    # file must start with magic number 43981 

    try: 

        temp = open(filename, 'rb').read(5) 

    except: 

        return False 

    if temp != '43981': 

        return False 

    return True 

 

 

def readQ(filename, headonly=False, data_directory=None, byteorder='=', 

          **kwargs):  # @UnusedVariable 

    """ 

    Reads a Seismic Handler Q file and returns an ObsPy Stream object. 

 

    .. warning:: 

        This function should NOT be called directly, it registers via the 

        ObsPy :func:`~obspy.core.stream.read` function, call this instead. 

 

    :type filename: str 

    :param filename: Q header file to be read. Must have a `QHD` file 

        extension. 

    :type headonly: bool, optional 

    :param headonly: If set to True, read only the head. This is most useful 

        for scanning available data in huge (temporary) data sets. 

    :type data_directory: str, optional 

    :param data_directory: Data directory where the corresponding QBN file can 

        be found. 

    :type byteorder: ``'<'``, ``'>'``, or ``'='``, optional 

    :param byteorder: Enforce byte order for data file. This is important for 

        Q files written in older versions of Seismic Handler, which don't 

        explicit state the `BYTEORDER` flag within the header file. Defaults 

        to ``'='`` (local byte order). 

    :rtype: :class:`~obspy.core.stream.Stream` 

    :return: A ObsPy Stream object. 

 

    Q files consists of two files per data set: 

 

     * a ASCII header file with file extension `QHD` and the 

     * binary data file with file extension `QBN`. 

 

    The read method only accepts header files for the ``filename`` parameter. 

    ObsPy assumes that the corresponding data file is within the same directory 

    if the ``data_directory`` parameter is not set. Otherwise it will search 

    in the given ``data_directory`` for a file with the `QBN` file extension. 

    This function should NOT be called directly, it registers via the 

    ObsPy :func:`~obspy.core.stream.read` function, call this instead. 

 

    .. rubric:: Example 

 

    >>> from obspy import read 

    >>> st = read("/path/to/QFILE-TEST.QHD") 

    >>> st    #doctest: +ELLIPSIS 

    <obspy.core.stream.Stream object at 0x...> 

    >>> print(st)  # doctest: +ELLIPSIS 

    3 Trace(s) in Stream: 

    .TEST..BHN | 2009-10-01T12:46:01.000000Z - ... | 20.0 Hz, 801 samples 

    .TEST..BHE | 2009-10-01T12:46:01.000000Z - ... | 20.0 Hz, 801 samples 

    .WET..HHZ  | 2010-01-01T01:01:05.999000Z - ... | 100.0 Hz, 4001 samples 

    """ 

    if not headonly: 

        if not data_directory: 

            data_file = os.path.splitext(filename)[0] + '.QBN' 

        else: 

            data_file = os.path.basename(os.path.splitext(filename)[0]) 

            data_file = os.path.join(data_directory, data_file + '.QBN') 

        if not os.path.isfile(data_file): 

            msg = "Can't find corresponding QBN file at %s." 

            raise IOError(msg % data_file) 

        fh_data = open(data_file, 'rb') 

    # loop through read header file 

    fh = open(filename, 'rt') 

    line = fh.readline() 

    cmtlines = int(line[5:7]) - 1 

    # comment lines 

    comments = [] 

    for _i in xrange(0, cmtlines): 

        comments += [fh.readline()] 

    # trace lines 

    traces = {} 

    i = -1 

    id = '' 

    for line in fh: 

        cid = int(line[0:2]) 

        if cid != id: 

            id = cid 

            i += 1 

        traces.setdefault(i, '') 

        traces[i] += line[3:].strip() 

    # create stream object 

    stream = Stream() 

    for id in sorted(traces.keys()): 

        # fetch headers 

        header = {} 

        header['sh'] = { 

            "FROMQ": True, 

            "FILE": os.path.splitext(os.path.split(filename)[1])[0], 

        } 

        channel = ['', '', ''] 

        npts = 0 

        for item in traces[id].split('~'): 

            key = item.strip()[0:4] 

            value = item.strip()[5:].strip() 

            if key == 'L001': 

                npts = header['npts'] = int(value) 

            elif key == 'L000': 

                continue 

            elif key == 'R000': 

                header['delta'] = float(value) 

            elif key == 'R026': 

                header['calib'] = float(value) 

            elif key == 'S001': 

                header['station'] = value 

            elif key == 'C000' and value: 

                channel[2] = value[0] 

            elif key == 'C001' and value: 

                channel[0] = value[0] 

            elif key == 'C002' and value: 

                channel[1] = value[0] 

            elif key == 'C003': 

                if value == '<' or value == '>': 

                    byteorder = header['sh']['BYTEORDER'] = value 

            elif key == 'S021': 

                # 01-JAN-2009_01:01:01.0 

                # 1-OCT-2009_12:46:01.000 

                header['starttime'] = toUTCDateTime(value) 

            elif key == 'S022': 

                header['sh']['P-ONSET'] = toUTCDateTime(value) 

            elif key == 'S023': 

                header['sh']['S-ONSET'] = toUTCDateTime(value) 

            elif key == 'S024': 

                header['sh']['ORIGIN'] = toUTCDateTime(value) 

            elif key: 

                key = INVERTED_SH_IDX.get(key, key) 

                if key in SH_KEYS_INT: 

                    header['sh'][key] = int(value) 

                elif key in SH_KEYS_FLOAT: 

                    header['sh'][key] = float(value) 

                else: 

                    header['sh'][key] = value 

        # set channel code 

        header['channel'] = ''.join(channel) 

        # remember record number 

        header['sh']['RECNO'] = len(stream) + 1 

        if headonly: 

            # skip data 

            stream.append(Trace(header=header)) 

        else: 

            if not npts: 

                stream.append(Trace(header=header)) 

                continue 

            # read data 

            data = fh_data.read(npts * 4) 

            dtype = byteorder + 'f4' 

            data = np.fromstring(data, dtype=dtype) 

            # convert to system byte order 

            data = np.require(data, '=f4') 

            stream.append(Trace(data=data, header=header)) 

    if not headonly: 

        fh_data.close() 

    return stream 

 

 

def writeQ(stream, filename, data_directory=None, byteorder='=', append=False, 

           **kwargs):  # @UnusedVariable 

    """ 

    Writes a Seismic Handler Q file from given ObsPy Stream object. 

 

    .. warning:: 

        This function should NOT be called directly, it registers via the 

        the :meth:`~obspy.core.stream.Stream.write` method of an 

        ObsPy :class:`~obspy.core.stream.Stream` object, call this instead. 

 

    :type stream: :class:`~obspy.core.stream.Stream` 

    :param stream: The ObsPy Stream object to write. 

    :type filename: str 

    :param filename: Name of the Q file to write. 

    :type data_directory: str, optional 

    :param data_directory: Data directory where the corresponding QBN will be 

        written. 

    :type byteorder: ``'<'``, ``'>'``, or ``'='``, optional 

    :param byteorder: Enforce byte order for data file. Defaults to ``'='`` 

        (local byte order). 

    :type append: bool, optional 

    :param append: If filename exists append all data to file, default False. 

    """ 

    if filename.endswith('.QHD') or filename.endswith('.QBN'): 

        filename = os.path.splitext(filename)[0] 

    if data_directory: 

        temp = os.path.basename(filename) 

        filename_data = os.path.join(data_directory, temp) 

    else: 

        filename_data = filename 

    filename_header = filename + '.QHD' 

 

    # if the header file exists its assumed that the data is also there 

    if os.path.exists(filename_header) and append: 

        try: 

            trcs = readQ(filename_header, headonly=True) 

            mode = 'ab' 

            count_offset = len(trcs) 

        except: 

            raise Exception("Target filename '%s' not readable!" % filename) 

    else: 

        append = False 

        mode = 'wb' 

        count_offset = 0 

 

    fh = open(filename_header, mode) 

    fh_data = open(filename_data + '.QBN', mode) 

 

    # build up header strings 

    headers = [] 

    minnol = 4 

    cur_npts = 0 

    for trace in stream: 

        temp = "L000:%d~ " % cur_npts 

        cur_npts += trace.stats.npts 

        temp += "L001:%d~ R000:%f~ R026:%f~ " % (trace.stats.npts, 

                                                 trace.stats.delta, 

                                                 trace.stats.calib) 

        if trace.stats.station: 

            temp += "S001:%s~ " % trace.stats.station 

        # component must be split 

        if len(trace.stats.channel) > 2: 

            temp += "C000:%c~ " % trace.stats.channel[2] 

        if len(trace.stats.channel) > 0: 

            temp += "C001:%c~ " % trace.stats.channel[0] 

        if len(trace.stats.channel) > 1: 

            temp += "C002:%c~ " % trace.stats.channel[1] 

        # special format for start time 

        dt = trace.stats.starttime 

        temp += "S021:%s~ " % fromUTCDateTime(dt) 

        for key, value in trace.stats.get('sh', {}).iteritems(): 

            # skip unknown keys 

            if not key or key not in SH_IDX.keys(): 

                continue 

            # convert UTCDateTimes into strings 

            if isinstance(value, UTCDateTime): 

                value = fromUTCDateTime(value) 

            temp += "%s:%s~ " % (SH_IDX[key], value) 

        headers.append(temp) 

        # get maximal number of trclines 

        nol = len(temp) / 74 + 1 

        if nol > minnol: 

            minnol = nol 

    # first line: magic number, cmtlines, trclines 

    # XXX: comment lines are ignored 

    if not append: 

        fh.write("43981 1 %d\n" % minnol) 

 

    for i, trace in enumerate(stream): 

        # write headers 

        temp = [headers[i][j:j + 74] for j in range(0, len(headers[i]), 74)] 

        for j in xrange(0, minnol): 

            try: 

                fh.write("%02d|%s\n" % ((i + 1 + count_offset) % 100, temp[j])) 

            except: 

                fh.write("%02d|\n" % ((i + 1 + count_offset) % 100)) 

        # write data in given byte order 

        dtype = byteorder + 'f4' 

        data = np.require(trace.data, dtype=dtype) 

        data.tofile(fh_data) 

    fh.close() 

    fh_data.close() 

 

 

def toUTCDateTime(value): 

    """ 

    Converts time string used within Seismic Handler into a UTCDateTime. 

 

    :type value: str 

    :param value: A Date time string. 

    :return: Converted :class:`~obspy.core.UTCDateTime` object. 

 

    .. rubric:: Example 

 

    >>> toUTCDateTime(' 2-JAN-2008_03:04:05.123') 

    UTCDateTime(2008, 1, 2, 3, 4, 5, 123000) 

    >>> toUTCDateTime('2-JAN-2008') 

    UTCDateTime(2008, 1, 2, 0, 0) 

    >>> toUTCDateTime('2-JAN-08') 

    UTCDateTime(2008, 1, 2, 0, 0) 

    >>> toUTCDateTime('2-JAN-99') 

    UTCDateTime(1999, 1, 2, 0, 0) 

    >>> toUTCDateTime('2-JAN-2008_1') 

    UTCDateTime(2008, 1, 2, 1, 0) 

    >>> toUTCDateTime('2-JAN-2008_1:1') 

    UTCDateTime(2008, 1, 2, 1, 1) 

    """ 

    try: 

        date, time = value.split('_') 

    except ValueError: 

        date = value 

        time = "0:0:0" 

    day, month, year = date.split('-') 

    time = time.split(':') 

    try: 

        hour, mins, secs = time 

    except ValueError: 

        hour = time[0] 

        mins = "0" 

        secs = "0" 

        if len(time) == 2: 

            mins = time[1] 

    day = int(day) 

    month = MONTHS.index(month.upper()) + 1 

    if len(year) == 2: 

        if int(year) < 70: 

            year = "20" + year 

        else: 

            year = "19" + year 

    year = int(year) 

    hour = int(hour) 

    mins = int(mins) 

    secs = float(secs) 

    return UTCDateTime(year, month, day, hour, mins) + secs 

 

 

def fromUTCDateTime(dt): 

    """ 

    Converts UTCDateTime object into a time string used within Seismic Handler. 

 

    :type dt: :class:`~obspy.core.UTCDateTime` 

    :param dt: A UTCDateTime object. 

    :return: Converted date time string usable by Seismic Handler. 

 

    .. rubric:: Example 

 

    >>> from obspy import UTCDateTime 

    >>> dt = UTCDateTime(2008, 1, 2, 3, 4, 5, 123456) 

    >>> fromUTCDateTime(dt) 

    ' 2-JAN-2008_03:04:05.123' 

    """ 

    pattern = "%2d-%3s-%4d_%02d:%02d:%02d.%03d" 

 

    return pattern % (dt.day, MONTHS[dt.month - 1], dt.year, dt.hour, 

                        dt.minute, dt.second, dt.microsecond / 1000) 

 

 

if __name__ == '__main__': 

    import doctest 

    doctest.testmod(exclude_empty=True)