devextreme/esm/viz/vector_map.utils/parser-dbf.js

HTML5 JavaScript Component Suite for Responsive Web Development

/**
 * DevExtreme (esm/viz/vector_map.utils/parser-dbf.js)
 * Version: 24.2.6
 * Build date: Mon Mar 17 2025
 *
 * Copyright (c) 2012 - 2025 Developer Express Inc. ALL RIGHTS RESERVED
 * Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
 */
function parseDBF(stream, errors) {
    var timeStart;
    var timeEnd;
    var header;
    var parseData;
    var records;
    try {
        timeStart = new Date;
        header = parseDataBaseFileHeader(stream, errors);
        parseData = prepareDataBaseFileRecordParseData(header, errors);
        records = parseDataBaseFileRecords(stream, header.numberOfRecords, header.recordLength, parseData, errors);
        timeEnd = new Date
    } catch (e) {
        errors.push("dbf: parsing error: " + e.message + " / " + e.description)
    }
    return {
        records: records,
        errors: errors,
        time: timeEnd - timeStart
    }
}

function parseDataBaseFileHeader(stream, errors) {
    var i;
    var header = {
        versionNumber: stream.ui8(),
        lastUpdate: new Date(1900 + stream.ui8(), stream.ui8() - 1, stream.ui8()),
        numberOfRecords: stream.ui32LE(),
        headerLength: stream.ui16LE(),
        recordLength: stream.ui16LE(),
        fields: []
    };
    var term;
    stream.skip(20);
    for (i = (header.headerLength - stream.pos() - 1) / 32; i > 0; --i) {
        header.fields.push(parseFieldDescriptor(stream))
    }
    term = stream.ui8();
    if (13 !== term) {
        errors.push("dbf: header terminator: " + term + " / expected: 13")
    }
    return header
}
var _fromCharCode = String.fromCharCode;

function getAsciiString(stream, length) {
    return _fromCharCode.apply(null, stream.ui8arr(length))
}

function parseFieldDescriptor(stream) {
    var desc = {
        name: getAsciiString(stream, 11).replace(/\0*$/gi, ""),
        type: _fromCharCode(stream.ui8()),
        length: stream.skip(4).ui8(),
        count: stream.ui8()
    };
    stream.skip(14);
    return desc
}
var DBF_FIELD_PARSERS = {
    C: function(stream, length) {
        var str = getAsciiString(stream, length);
        try {
            str = decodeURIComponent(escape(str))
        } catch (e) {}
        return str.trim()
    },
    N: function(stream, length) {
        var str = getAsciiString(stream, length);
        return parseFloat(str)
    },
    D: function(stream, length) {
        var str = getAsciiString(stream, length);
        return new Date(str.substring(0, 4), str.substring(4, 6) - 1, str.substring(6, 8))
    }
};

function DBF_FIELD_PARSER_DEFAULT(stream, length) {
    stream.skip(length);
    return null
}

function prepareDataBaseFileRecordParseData(header, errors) {
    var list = [];
    var i = 0;
    var ii = header.fields.length;
    var item;
    var field;
    var totalLength = 0;
    for (i = 0; i < ii; ++i) {
        field = header.fields[i];
        item = {
            name: field.name,
            parser: DBF_FIELD_PARSERS[field.type],
            length: field.length
        };
        if (!item.parser) {
            item.parser = DBF_FIELD_PARSER_DEFAULT;
            errors.push("dbf: field " + field.name + " type: " + field.type + " / unknown")
        }
        totalLength += field.length;
        list.push(item)
    }
    if (totalLength + 1 !== header.recordLength) {
        errors.push("dbf: record length: " + header.recordLength + " / actual: " + (totalLength + 1))
    }
    return list
}

function parseDataBaseFileRecords(stream, recordCount, recordLength, parseData, errors) {
    var i;
    var j;
    var jj = parseData.length;
    var pos;
    var records = [];
    var record;
    var pd;
    for (i = 0; i < recordCount; ++i) {
        record = {};
        pos = stream.pos();
        stream.skip(1);
        for (j = 0; j < jj; ++j) {
            pd = parseData[j];
            record[pd.name] = pd.parser(stream, pd.length)
        }
        pos = stream.pos() - pos;
        if (pos !== recordLength) {
            errors.push("dbf: record #" + (i + 1) + " length: " + recordLength + " / actual: " + pos)
        }
        records.push(record)
    }
    return records
}