var generateZipParts = function()

in TestApplications/JDIChromePlugin/DevPanel/libs/jszip/jszip.js [1070:1231]
137 lines of code
12 McCabe index (conditional complexity)

var generateZipParts = function(name, file, compressedObject, offset, platform) {
    var data = compressedObject.compressedContent,
        utfEncodedFileName = utils.transformTo("string", utf8.utf8encode(file.name)),
        comment = file.comment || "",
        utfEncodedComment = utils.transformTo("string", utf8.utf8encode(comment)),
        useUTF8ForFileName = utfEncodedFileName.length !== file.name.length,
        useUTF8ForComment = utfEncodedComment.length !== comment.length,
        o = file.options,
        dosTime,
        dosDate,
        extraFields = "",
        unicodePathExtraField = "",
        unicodeCommentExtraField = "",
        dir, date;


    // handle the deprecated options.dir
    if (file._initialMetadata.dir !== file.dir) {
        dir = file.dir;
    } else {
        dir = o.dir;
    }

    // handle the deprecated options.date
    if(file._initialMetadata.date !== file.date) {
        date = file.date;
    } else {
        date = o.date;
    }

    var extFileAttr = 0;
    var versionMadeBy = 0;
    if (dir) {
        // dos or unix, we set the dos dir flag
        extFileAttr |= 0x00010;
    }
    if(platform === "UNIX") {
        versionMadeBy = 0x031E; // UNIX, version 3.0
        extFileAttr |= generateUnixExternalFileAttr(file.unixPermissions, dir);
    } else { // DOS or other, fallback to DOS
        versionMadeBy = 0x0014; // DOS, version 2.0
        extFileAttr |= generateDosExternalFileAttr(file.dosPermissions, dir);
    }

    // date
    // @see http://www.delorie.com/djgpp/doc/rbinter/it/52/13.html
    // @see http://www.delorie.com/djgpp/doc/rbinter/it/65/16.html
    // @see http://www.delorie.com/djgpp/doc/rbinter/it/66/16.html

    dosTime = date.getHours();
    dosTime = dosTime << 6;
    dosTime = dosTime | date.getMinutes();
    dosTime = dosTime << 5;
    dosTime = dosTime | date.getSeconds() / 2;

    dosDate = date.getFullYear() - 1980;
    dosDate = dosDate << 4;
    dosDate = dosDate | (date.getMonth() + 1);
    dosDate = dosDate << 5;
    dosDate = dosDate | date.getDate();

    if (useUTF8ForFileName) {
        // set the unicode path extra field. unzip needs at least one extra
        // field to correctly handle unicode path, so using the path is as good
        // as any other information. This could improve the situation with
        // other archive managers too.
        // This field is usually used without the utf8 flag, with a non
        // unicode path in the header (winrar, winzip). This helps (a bit)
        // with the messy Windows' default compressed folders feature but
        // breaks on p7zip which doesn't seek the unicode path extra field.
        // So for now, UTF-8 everywhere !
        unicodePathExtraField =
            // Version
            decToHex(1, 1) +
            // NameCRC32
            decToHex(crc32(utfEncodedFileName), 4) +
            // UnicodeName
            utfEncodedFileName;

        extraFields +=
            // Info-ZIP Unicode Path Extra Field
            "\x75\x70" +
            // size
            decToHex(unicodePathExtraField.length, 2) +
            // content
            unicodePathExtraField;
    }

    if(useUTF8ForComment) {

        unicodeCommentExtraField =
            // Version
            decToHex(1, 1) +
            // CommentCRC32
            decToHex(this.crc32(utfEncodedComment), 4) +
            // UnicodeName
            utfEncodedComment;

        extraFields +=
            // Info-ZIP Unicode Path Extra Field
            "\x75\x63" +
            // size
            decToHex(unicodeCommentExtraField.length, 2) +
            // content
            unicodeCommentExtraField;
    }

    var header = "";

    // version needed to extract
    header += "\x0A\x00";
    // general purpose bit flag
    // set bit 11 if utf8
    header += (useUTF8ForFileName || useUTF8ForComment) ? "\x00\x08" : "\x00\x00";
    // compression method
    header += compressedObject.compressionMethod;
    // last mod file time
    header += decToHex(dosTime, 2);
    // last mod file date
    header += decToHex(dosDate, 2);
    // crc-32
    header += decToHex(compressedObject.crc32, 4);
    // compressed size
    header += decToHex(compressedObject.compressedSize, 4);
    // uncompressed size
    header += decToHex(compressedObject.uncompressedSize, 4);
    // file name length
    header += decToHex(utfEncodedFileName.length, 2);
    // extra field length
    header += decToHex(extraFields.length, 2);


    var fileRecord = signature.LOCAL_FILE_HEADER + header + utfEncodedFileName + extraFields;

    var dirRecord = signature.CENTRAL_FILE_HEADER +
    // version made by (00: DOS)
    decToHex(versionMadeBy, 2) +
    // file header (common to file and central directory)
    header +
    // file comment length
    decToHex(utfEncodedComment.length, 2) +
    // disk number start
    "\x00\x00" +
    // internal file attributes TODO
    "\x00\x00" +
    // external file attributes
    decToHex(extFileAttr, 4) +
    // relative offset of local header
    decToHex(offset, 4) +
    // file name
    utfEncodedFileName +
    // extra field
    extraFields +
    // file comment
    utfEncodedComment;

    return {
        fileRecord: fileRecord,
        dirRecord: dirRecord,
        compressedObject: compressedObject
    };
};