Ejemplo n.º 1
0
static gboolean
gwyfile_save(GwyContainer *data,
             const gchar *filename,
             G_GNUC_UNUSED GwyRunType mode,
             GError **error)
{
    GByteArray *buffer;
    gchar *filename_orig_utf8, *filename_utf8;
    FILE *fh;
    gboolean restore_filename, ok = TRUE;

    if (!(fh = g_fopen(filename, "wb"))) {
        err_OPEN_WRITE(error);
        return FALSE;
    }

    /* Assure the saved file contains its own name under "/filename" */
    restore_filename = TRUE;
    filename_orig_utf8 = NULL;
    gwy_container_gis_string_by_name(data, "/filename",
                                     (const guchar**)&filename_orig_utf8);
    filename_orig_utf8 = g_strdup(filename_orig_utf8);

    filename_utf8 = g_filename_to_utf8(filename, -1, NULL, NULL, NULL);
    if (!filename_utf8)
        gwy_container_remove_by_name(data, "/filename");
    else if (filename_orig_utf8
             && gwy_strequal(filename_orig_utf8, filename_utf8)) {
        restore_filename = FALSE;
    }
    else {
        gwy_container_set_string_by_name(data, "/filename", filename_utf8);
        filename_utf8 = NULL;
    }

    /* Serialize */
    buffer = gwy_serializable_serialize(G_OBJECT(data), NULL);
    if (fwrite(MAGIC2, 1, MAGIC_SIZE, fh) != MAGIC_SIZE
        || fwrite(buffer->data, 1, buffer->len, fh) != buffer->len) {
        err_WRITE(error);
        ok = FALSE;
        g_unlink(filename);
    }
    fclose(fh);
    g_byte_array_free(buffer, TRUE);

    /* Restore filename if save failed */
    if (!ok && restore_filename) {
        if (filename_orig_utf8)
            gwy_container_set_string_by_name(data, "/filename",
                                             filename_orig_utf8);
        else
            gwy_container_remove_by_name(data, "/filename");
        filename_orig_utf8 = NULL;
    }
    g_free(filename_orig_utf8);
    g_free(filename_utf8);

    return ok;
}
Ejemplo n.º 2
0
static gboolean
surffile_save(GwyContainer *data,
             const gchar *filename,
             G_GNUC_UNUSED GwyRunType mode,
             GError **error)
{
    FILE *fh;
    gboolean ok = TRUE;
    SurfWriter surf;
    gfloat uintmax = 1073741824.0;
    gdouble zmaxreal;
    gdouble zminreal;
    gdouble xreal;
    gdouble yreal;
    gchar *dxunittmp;
    gchar *dyunittmp;
    gchar *dzunittmp;
    GwySIUnit *xysi;
    GwySIUnit *zsi;
    GwyContainer *current_data;
    int power = 0;
    int k = 0;
    GwyDataField *dfield;
    const gdouble *points;
    gint32 *integer_values;

    strncpy(surf.signature, "DIGITAL SURF", 12);
    surf.format = 0;
    surf.nobjects = 1;
    surf.version = 1;
    surf.type = 1;
    strncpy(surf.object_name, "SCRATCH", 30);
    strncpy(surf.operator_name, "csm", 30);
    surf.material_code = 0;
    surf.acquisition = 0;
    surf.range = 1;
    surf.special_points = 0;
    surf.absolute = 1;
    strncpy(surf.reserved, " ", 8);
    surf.pointsize = 32;
    surf.zmin = 0;
    surf.zmax = 1073741824.0;
    strncpy(surf.xaxis, "X", 16);
    strncpy(surf.yaxis, "Y", 16);
    strncpy(surf.zaxis, "Z", 16);
    surf.xunit_ratio = 1;
    surf.yunit_ratio = 1;
    surf.zunit_ratio = 1;
    surf.imprint = 1;
    surf.inversion = 0;
    surf.leveling = 0;
    strncpy(surf.obsolete, " ", 12);
    surf.seconds = 0;
    surf.minutes = 0;
    surf.hours = 0;
    surf.day = 5;
    surf.month = 1;
    surf.year = 2001;
    surf.dayof = 0;
    surf.measurement_duration = 1.0;
    strncpy(surf.obsolete2, " ", 10);
    surf.comment_size = 0;
    surf.private_size = 0;
    strncpy(surf.client_zone," ", 128);

    surf.XOffset = 0.0;
    surf.YOffset = 0.0;
    surf.ZOffset = 0.0;
    strncpy(surf.reservedzone, " ", 34);

    if (!(fh = gwy_fopen( filename, "wb"))) {
        err_OPEN_WRITE(error);
        return FALSE;
    }

    gwy_app_data_browser_get_current(GWY_APP_CONTAINER, &current_data, 0);
    if (!current_data) {
        err_NO_CHANNEL_EXPORT(error);
        return FALSE;
    }

    if (data != current_data) {
        return FALSE;
    }

    gwy_app_data_browser_get_current(GWY_APP_DATA_FIELD, &dfield, 0);
    if (!dfield) {
        err_NO_CHANNEL_EXPORT(error);
        return FALSE;
    }

    /*header values*/
    xysi = gwy_data_field_get_si_unit_xy(dfield);
    zsi = gwy_data_field_get_si_unit_z(dfield);
    dxunittmp = gwy_si_unit_get_string(xysi, GWY_SI_UNIT_FORMAT_PLAIN);
    dyunittmp = gwy_si_unit_get_string (xysi, GWY_SI_UNIT_FORMAT_PLAIN);
    dzunittmp = gwy_si_unit_get_string (zsi, GWY_SI_UNIT_FORMAT_PLAIN);
    strncpy(surf.dx_unit, dxunittmp, 16);
    strncpy(surf.dy_unit, dyunittmp, 16);
    strncpy(surf.dz_unit, dzunittmp, 16);
    g_free(dxunittmp);
    g_free(dyunittmp);
    g_free(dzunittmp);

    /*extrema*/
    zmaxreal = gwy_data_field_get_max(dfield);
    zminreal = gwy_data_field_get_min(dfield);
    surf.xres = gwy_data_field_get_xres(dfield);
    surf.yres = gwy_data_field_get_yres(dfield);
    surf.nofpoints = surf.xres * surf.yres;
    xreal = gwy_data_field_get_xreal(dfield);
    yreal = gwy_data_field_get_yreal(dfield);

    /*units*/
    power = 0;
    surf.dx = (gfloat)(xreal / surf.xres);
    get_unit(surf.dx_unit, &power, xreal);
    surf.dx *= pow10(power);
    strncpy(surf.xlength_unit, surf.dx_unit, 16);
    power = 0;
    surf.dy = (gfloat)(yreal / surf.yres);
    get_unit(surf.dy_unit, &power, yreal);
    surf.dy *= pow10(power);
    strncpy(surf.ylength_unit, surf.dy_unit, 16);

    power = 0;
    if (zmaxreal > zminreal) {
        get_unit(surf.dz_unit, &power, (zmaxreal - zminreal));
    }
    strncpy(surf.zlength_unit, surf.dz_unit, 16);

    zmaxreal *= pow10(power);
    zminreal *= pow10(power);
    surf.dz = (zmaxreal - zminreal) / uintmax;
    surf.ZOffset = zminreal;

    /*convert data into integer32*/
    integer_values = g_new(gint32, surf.nofpoints);
    points = gwy_data_field_get_data_const(dfield);

    if (zminreal != zmaxreal) {
        for (k = 0; k < surf.nofpoints; k++) {  // * pow10( power ) to convert in the dz_unit
            integer_values[k] = floor(uintmax * (points[k] * pow10(power)  - zminreal) / (zmaxreal - zminreal));
        }
    }
    else {
        for (k = 0; k < surf.nofpoints; k++) {
            integer_values[k] = 0;
        }
    }


    /* byte order*/
    surf.format = GINT16_TO_LE(surf.format);
    surf.nobjects = GUINT16_TO_LE(surf.nobjects);
    surf.version = GINT16_TO_LE(surf.version);
    surf.type = GINT16_TO_LE(surf.type);
    surf.material_code = GINT16_TO_LE(surf.material_code);
    surf.acquisition = GINT16_TO_LE(surf.acquisition);
    surf.range = GINT16_TO_LE(surf.range);
    surf.special_points = GINT16_TO_LE(surf.special_points);
    surf.absolute = GINT16_TO_LE(surf.absolute);
    surf.pointsize = GINT16_TO_LE(surf.pointsize);
    surf.zmin = GINT32_TO_LE(surf.zmin);
    surf.zmax = GINT32_TO_LE(surf.zmax);
    surf.xres = GINT32_TO_LE(surf.xres);
    surf.yres = GINT32_TO_LE(surf.yres);
    surf.nofpoints = GINT32_TO_LE(surf.nofpoints);
    surf.dx = GFLOAT_TO_LE(surf.dx);
    surf.dy = GFLOAT_TO_LE(surf.dy);
    surf.dz = GFLOAT_TO_LE(surf.dz);
    surf.xunit_ratio = GFLOAT_TO_LE(surf.xunit_ratio);
    surf.yunit_ratio = GFLOAT_TO_LE(surf.yunit_ratio);
    surf.zunit_ratio = GFLOAT_TO_LE(surf.zunit_ratio);
    surf.imprint = GINT16_TO_LE(surf.imprint);
    surf.inversion = GINT16_TO_LE(surf.inversion);
    surf.leveling = GINT16_TO_LE(surf.leveling);
    surf.seconds = GINT16_TO_LE(surf.seconds);
    surf.minutes = GINT16_TO_LE(surf.minutes);
    surf.hours = GINT16_TO_LE(surf.hours);
    surf.day = GINT16_TO_LE(surf.day);
    surf.month = GINT16_TO_LE(surf.month);
    surf.year = GINT16_TO_LE(surf.year);
    surf.dayof = GINT16_TO_LE(surf.dayof);
    surf.measurement_duration = GFLOAT_TO_LE(surf.measurement_duration);
    surf.comment_size = GINT16_TO_LE(surf.comment_size);
    surf.private_size = GINT16_TO_LE(surf.private_size);
    surf.XOffset = GFLOAT_TO_LE(surf.XOffset);
    surf.YOffset = GFLOAT_TO_LE(surf.YOffset);
    surf.ZOffset = GFLOAT_TO_LE(surf.ZOffset);
    for (k = 0; k < surf.nofpoints; k++) {
        integer_values[k] = GINT32_TO_LE(integer_values[k]);
    }


//write

// fwrite(&surf, sizeof( SurfWriter ), 1, fh) bad struct align
    if(
        fwrite(&surf.signature, sizeof(char), 12, fh) != 12 ||
        fwrite(&surf.format, sizeof(gint16), 1, fh) != 1 ||
        fwrite(&surf.nobjects, sizeof(guint16), 1, fh) != 1 ||
        fwrite(&surf.version, sizeof(gint16), 1, fh) != 1 ||
        fwrite(&surf.type, sizeof(gint16), 1, fh) != 1 ||
        fwrite(&surf.object_name, sizeof(char), 30, fh) != 30 ||
        fwrite(&surf.operator_name, sizeof(char), 30, fh) != 30 ||
        fwrite(&surf.material_code, sizeof(gint16), 1, fh) != 1 ||
        fwrite(&surf.acquisition, sizeof(gint16), 1, fh) != 1 ||
        fwrite(&surf.range, sizeof(gint16), 1, fh) != 1 ||
        fwrite(&surf.special_points, sizeof(gint16), 1, fh) != 1 ||
        fwrite(&surf.absolute, sizeof(gint16), 1, fh) != 1 ||
        fwrite(&surf.reserved, sizeof(char), 8, fh) != 8 ||
        fwrite(&surf.pointsize, sizeof(gint16), 1, fh) != 1 ||
        fwrite(&surf.zmin, sizeof(gint32), 1, fh) != 1 ||
        fwrite(&surf.zmax, sizeof(gint32), 1, fh) != 1 ||
        fwrite(&surf.xres, sizeof(gint32), 1, fh) != 1 ||
        fwrite(&surf.yres, sizeof(gint32), 1, fh) != 1 ||
        fwrite(&surf.nofpoints, sizeof(gint32), 1, fh) != 1 ||
        fwrite(&surf.dx, sizeof(gfloat), 1, fh) != 1 ||
        fwrite(&surf.dy, sizeof(gfloat), 1, fh) != 1 ||
        fwrite(&surf.dz, sizeof(gfloat), 1, fh) != 1 ||
        fwrite(&surf.xaxis, sizeof(char), 16, fh) != 16 ||
        fwrite(&surf.yaxis, sizeof(char), 16, fh) != 16 ||
        fwrite(&surf.zaxis, sizeof(char), 16, fh) != 16 ||
        fwrite(&surf.dx_unit, sizeof(char), 16, fh) != 16 ||
        fwrite(&surf.dy_unit, sizeof(char), 16, fh) != 16 ||
        fwrite(&surf.dz_unit, sizeof(char), 16, fh) != 16 ||
        fwrite(&surf.xlength_unit, sizeof(char), 16, fh) != 16 ||
        fwrite(&surf.ylength_unit, sizeof(char), 16, fh) != 16 ||
        fwrite(&surf.zlength_unit, sizeof(char), 16, fh) != 16 ||
        fwrite(&surf.xunit_ratio, sizeof(gfloat), 1, fh) != 1 ||
        fwrite(&surf.yunit_ratio, sizeof(gfloat), 1, fh) != 1 ||
        fwrite(&surf.zunit_ratio, sizeof(gfloat), 1, fh) != 1 ||
        fwrite(&surf.imprint, sizeof(gint16), 1, fh) != 1 ||
        fwrite(&surf.inversion, sizeof(gint16), 1, fh) != 1 ||
        fwrite(&surf.leveling, sizeof(gint16), 1, fh) != 1 ||
        fwrite(&surf.obsolete, sizeof(char), 12, fh) != 12 ||
        fwrite(&surf.seconds, sizeof(gint16), 1, fh) != 1 ||
        fwrite(&surf.minutes, sizeof(gint16), 1, fh) != 1 ||
        fwrite(&surf.hours, sizeof(gint16), 1, fh) != 1 ||
        fwrite(&surf.day, sizeof(gint16), 1, fh) != 1 ||
        fwrite(&surf.month, sizeof(gint16), 1, fh) != 1 ||
        fwrite(&surf.year, sizeof(gint16), 1, fh) != 1 ||
        fwrite(&surf.dayof, sizeof(gint16),1,fh) != 1 ||
        fwrite(&surf.measurement_duration, sizeof(gfloat), 1, fh) != 1 ||
        fwrite(&surf.obsolete2, sizeof(char), 10, fh) != 10 ||
        fwrite(&surf.comment_size, sizeof(gint16), 1, fh) != 1 ||
        fwrite(&surf.private_size, sizeof(gint16), 1, fh) != 1 ||
        fwrite(&surf.client_zone, sizeof(char), 128, fh) != 128 ||
        fwrite(&surf.XOffset, sizeof(gfloat), 1, fh) != 1 ||
        fwrite(&surf.YOffset, sizeof(gfloat), 1, fh) != 1 ||
        fwrite(&surf.ZOffset, sizeof(gfloat), 1, fh) != 1 ||
        fwrite(&surf.reservedzone, sizeof(char), 34, fh)!= 34 ||
        fwrite(integer_values, sizeof(gint32), surf.nofpoints, fh) != surf.nofpoints
	    ) {
            err_WRITE(error);
            ok = FALSE;
            g_unlink(filename);
        }

    g_free(integer_values);
    fclose( fh );

    return ok;
}
Ejemplo n.º 3
0
static gboolean
asc_export(GwyContainer *data,
           const gchar *filename,
           G_GNUC_UNUSED GwyRunType mode,
           GError **error)
{
    GwyDataField *dfield;
    guint xres, i, n;
    gchar *header;
    const gdouble *d;
    gboolean zunit_is_nm;
    FILE *fh;

    gwy_app_data_browser_get_current(GWY_APP_DATA_FIELD, &dfield, 0);

    if (!dfield) {
        err_NO_CHANNEL_EXPORT(error);
        return FALSE;
    }

    if (!(fh = gwy_fopen(filename, "w"))) {
        err_OPEN_WRITE(error);
        return FALSE;
    }

    header = asc_format_header(data, dfield, &zunit_is_nm);
    if (fputs(header, fh) == EOF)
        goto fail;

    d = gwy_data_field_get_data_const(dfield);
    xres = gwy_data_field_get_xres(dfield);
    n = xres*gwy_data_field_get_yres(dfield);
    for (i = 0; i < n; i++) {
        gchar buf[G_ASCII_DTOSTR_BUF_SIZE];
        gchar c;

        if (zunit_is_nm)
            g_ascii_dtostr(buf, G_ASCII_DTOSTR_BUF_SIZE, d[i]/Nanometer);
        else
            g_ascii_dtostr(buf, G_ASCII_DTOSTR_BUF_SIZE, d[i]);

        if (fputs(buf, fh) == EOF)
            goto fail;

        c = (i % xres == xres-1) ? '\n' : '\t';
        if (fputc(c, fh) == EOF)
            goto fail;
    }

    fclose(fh);
    g_free(header);

    return TRUE;

fail:
    err_WRITE(error);
    fclose(fh);
    g_free(header);
    g_unlink(filename);

    return FALSE;
}
Ejemplo n.º 4
0
static gboolean
gsf_export(GwyContainer *container,
           const gchar *filename,
           G_GNUC_UNUSED GwyRunType mode,
           GError **error)
{
    static const gchar zeroes[4] = { 0, 0, 0, 0 };
    GString *header = NULL;
    gfloat *dfl = NULL;
    guint i, xres, yres, padding;
    gint id;
    GwyDataField *dfield;
    const gdouble *d;
    gdouble v;
    gchar *s;
    GwySIUnit *unit, *emptyunit;
    FILE *fh;

    gwy_app_data_browser_get_current(GWY_APP_DATA_FIELD, &dfield,
                                     GWY_APP_DATA_FIELD_ID, &id,
                                     0);
    if (!dfield) {
        err_NO_CHANNEL_EXPORT(error);
        return FALSE;
    }

    if (!(fh = g_fopen(filename, "wb"))) {
        err_OPEN_WRITE(error);
        return FALSE;
    }

    xres = gwy_data_field_get_xres(dfield);
    yres = gwy_data_field_get_yres(dfield);

    header = g_string_new(MAGIC);
    g_string_append_printf(header, "XRes = %u\n", xres);
    g_string_append_printf(header, "YRes = %u\n", yres);
    append_num(header, "XReal", gwy_data_field_get_xreal(dfield));
    append_num(header, "YReal", gwy_data_field_get_yreal(dfield));
    if ((v = gwy_data_field_get_xoffset(dfield)))
        append_num(header, "XOffset", v);
    if ((v = gwy_data_field_get_yoffset(dfield)))
        append_num(header, "YOffset", v);

    emptyunit = gwy_si_unit_new(NULL);
    unit = gwy_data_field_get_si_unit_xy(dfield);
    if (!gwy_si_unit_equal(unit, emptyunit)) {
        s = gwy_si_unit_get_string(unit, GWY_SI_UNIT_FORMAT_PLAIN);
        g_string_append_printf(header, "XYUnits = %s\n", s);
        g_free(s);
    }
    unit = gwy_data_field_get_si_unit_z(dfield);
    if (!gwy_si_unit_equal(unit, emptyunit)) {
        s = gwy_si_unit_get_string(unit, GWY_SI_UNIT_FORMAT_PLAIN);
        g_string_append_printf(header, "ZUnits = %s\n", s);
        g_free(s);
    }
    g_object_unref(emptyunit);

    s = gwy_app_get_data_field_title(container, id);
    g_string_append_printf(header, "Title = %s\n", s);
    g_free(s);

    if (fwrite(header->str, 1, header->len, fh) != header->len) {
        err_WRITE(error);
        goto fail;
    }

    padding = 4 - (header->len % 4);
    if (fwrite(zeroes, 1, padding, fh) != padding) {
        err_WRITE(error);
        goto fail;
    }
    g_string_free(header, TRUE);
    header = NULL;

    dfl = g_new(gfloat, xres*yres);
    d = gwy_data_field_get_data_const(dfield);
    for (i = 0; i < xres*yres; i++) {
        union { guchar pp[4]; float f; } z;
        z.f = d[i];
#if (G_BYTE_ORDER == G_BIG_ENDIAN)
        GWY_SWAP(guchar, z.pp[0], z.pp[3]);
        GWY_SWAP(guchar, z.pp[1], z.pp[2]);
#endif
        dfl[i] = z.f;
    }

    if (fwrite(dfl, sizeof(gfloat), xres*yres, fh) != xres*yres) {
        err_WRITE(error);
        goto fail;
    }
    g_free(dfl);
    fclose(fh);

    return TRUE;

fail:
    if (fh)
        fclose(fh);
    g_unlink(filename);
    if (header)
        g_string_free(header, TRUE);
    g_free(dfl);

    return FALSE;
}
Ejemplo n.º 5
0
static gboolean
aafm_export(G_GNUC_UNUSED GwyContainer *data,
            const gchar *filename,
            G_GNUC_UNUSED GwyRunType mode,
            GError **error)
{
    union { guchar pp[4]; float f; } z;
    guint16 res, r;
    gint16 *x;
    gint16 v;
    gint i, j, xres, yres, n;
    GwyDataField *dfield;
    const gdouble *d;
    gdouble min, max, q, z0;
    FILE *fh;
    gboolean ok = TRUE;

    gwy_app_data_browser_get_current(GWY_APP_DATA_FIELD, &dfield, 0);
    if (!dfield) {
        err_NO_CHANNEL_EXPORT(error);
        return FALSE;
    }

    if (!(fh = gwy_fopen(filename, "wb"))) {
        err_OPEN_WRITE(error);
        return FALSE;
    }

    d = gwy_data_field_get_data_const(dfield);

    xres = gwy_data_field_get_xres(dfield);
    yres = gwy_data_field_get_yres(dfield);
    res = MIN(MIN(xres, yres), 32767);
    n = (gint)res*(gint)res;
    r = GUINT16_TO_LE(res);
    fwrite(&res, 1, sizeof(r), fh);

    gwy_data_field_get_min_max(dfield, &min, &max);
    if (min == max) {
        q = 0.0;
        z0 = 0.0;
    }
    else {
        q = 65533.0/(max - min);
        z0 = -32766.5*(max + min)/(max - min);
    }
    z.f = MIN(gwy_data_field_get_xreal(dfield),
              gwy_data_field_get_yreal(dfield))/Angstrom;
#if (G_BYTE_ORDER == G_BIG_ENDIAN)
    GWY_SWAP(guchar, z.pp[0], z.pp[3]);
    GWY_SWAP(guchar, z.pp[1], z.pp[2]);
#endif
    fwrite(&z, 1, sizeof(z), fh);

    x = g_new(gint16, n);
    for (i = 0; i < res; i++) {
        for (j = 0; j < res; j++) {
            v = GWY_ROUND(d[(res-1 - j)*res + i]*q + z0);
            x[i*res + j] = GINT16_TO_LE(v);
        }
    }

    if (!(ok = (fwrite(x, 1, 2*n, fh) == 2*n))) {
        err_WRITE(error);
        g_unlink(filename);
    }
    else {
        z.f = (max - min)/Angstrom;
#if (G_BYTE_ORDER == G_BIG_ENDIAN)
        GWY_SWAP(guchar, z.pp[0], z.pp[3]);
        GWY_SWAP(guchar, z.pp[1], z.pp[2]);
#endif
        fwrite(&z, 1, sizeof(z), fh);
    }

    fclose(fh);
    g_free(x);

    return ok;
}
Ejemplo n.º 6
0
static gboolean
sdfile_export_text(G_GNUC_UNUSED GwyContainer *data,
                   const gchar *filename,
                   G_GNUC_UNUSED GwyRunType mode,
                   GError **error)
{
    enum { SCALE = 65535 };
    static const gchar header_format[] =
        "aBCR-0.0\n"
        "ManufacID   = Gwyddion\n"
        "CreateDate  = %02u%02u%04u%02u%02u\n"
        "ModDate     = %02u%02u%04u%02u%02u\n"
        "NumPoints   = %d\n"
        "NumProfiles = %d\n"
        "Xscale      = %e\n"
        "Yscale      = %e\n"
        "Zscale      = %e\n"
        "Zresolution = -1\n"  /* FIXME: Dunno */
        "Compression = 0\n"
        "DataType    = %d\n"
        "CheckType   = 0\n"
        "NumDataSet  = 1\n"
        "NanPresent  = 0\n"
        "*\n";

    GwyDataField *dfield;
    const gdouble *d;
    gint xres, yres, i;
    const struct tm *ttm;
    gchar buf[24];
    time_t t;
    FILE *fh;

    gwy_app_data_browser_get_current(GWY_APP_DATA_FIELD, &dfield, 0);
    if (!dfield) {
        err_NO_CHANNEL_EXPORT(error);
        return FALSE;
    }

    if (!(fh = g_fopen(filename, "w"))) {
        err_OPEN_WRITE(error);
        return FALSE;
    }

    d = gwy_data_field_get_data_const(dfield);
    xres = gwy_data_field_get_xres(dfield);
    yres = gwy_data_field_get_yres(dfield);

    /* We do not keep date information, just use the current time */
    time(&t);
    ttm = localtime(&t);
    fprintf(fh, header_format,
            ttm->tm_mday, ttm->tm_mon, ttm->tm_year, ttm->tm_hour, ttm->tm_min,
            ttm->tm_mday, ttm->tm_mon, ttm->tm_year, ttm->tm_hour, ttm->tm_min,
            xres, yres,
            gwy_data_field_get_xmeasure(dfield),
            gwy_data_field_get_ymeasure(dfield),
            1.0,
            SDF_FLOAT);
    for (i = 0; i < xres*yres; i++) {
        g_ascii_formatd(buf, sizeof(buf), "%g", d[i]);
        fputs(buf, fh);
        fputc('\n', fh);
    }
    fclose(fh);

    return TRUE;
}