thumbnail.c

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#include "thumbnail.h"


DxfThumbnail *
dxf_thumbnail_new ()
{
#if DEBUG
        DXF_DEBUG_BEGIN
#endif
        DxfThumbnail *thumbnail = NULL;
        size_t size;

        size = sizeof (DxfThumbnail);
        /* avoid malloc of 0 bytes */
        if (size == 0) size = 1;
        if ((thumbnail = malloc (size)) == NULL)
        {
                fprintf (stderr,
                  (_("Error in %s () could not allocate memory for a DxfThumbnail struct.\n")),
                  __FUNCTION__);
                thumbnail = NULL;
        }
        else
        {
                memset (thumbnail, 0, size);
        }
#if DEBUG
        DXF_DEBUG_END
#endif
        return (thumbnail);
}


DxfThumbnail *
dxf_thumbnail_init
(
        DxfThumbnail *thumbnail
)
{
#if DEBUG
        DXF_DEBUG_BEGIN
#endif
        int i;

        /* Do some basic checks. */
        if (thumbnail == NULL)
        {
                fprintf (stderr,
                  (_("Warning in %s () a NULL pointer was passed.\n")),
                  __FUNCTION__);
                thumbnail = dxf_thumbnail_new ();
        }
        if (thumbnail == NULL)
        {
                fprintf (stderr,
                  (_("Error in %s () could not allocate memory for a DxfThumbnail struct.\n")),
                  __FUNCTION__);
                return (NULL);
        }
        thumbnail->number_of_bytes = 0;
        for (i = 0; i < DXF_MAX_PARAM; i++)
        {
                thumbnail->preview_image_data[i] = strdup ("");
        }
#if DEBUG
        DXF_DEBUG_END
#endif
        return (thumbnail);
}


DxfThumbnail *
dxf_thumbnail_read
(
        DxfFile *fp,
        DxfThumbnail *thumbnail
)
{
#if DEBUG
        DXF_DEBUG_BEGIN
#endif
        char *temp_string = NULL;
        int i;
        int preview_data_length = 0;

        /* Do some basic checks. */
        if (fp == NULL)
        {
                fprintf (stderr,
                  (_("Error in %s () a NULL file pointer was passed.\n")),
                  __FUNCTION__);
                /* Clean up. */
                free (temp_string);
                return (NULL);
        }
        if (thumbnail == NULL)
        {
                fprintf (stderr,
                  (_("Warning in %s () a NULL pointer was passed.\n")),
                  __FUNCTION__);
                thumbnail = dxf_thumbnail_new ();
                thumbnail = dxf_thumbnail_init (thumbnail);
        }
        if (fp->acad_version_number < AutoCAD_2000)
        {
                fprintf (stderr,
                  (_("Warning in %s () illegal DXF version for this entity.\n")),
                  __FUNCTION__);
        }
        i = 0;
        (fp->line_number)++;
        fscanf (fp->fp, "%[^\n]", temp_string);
        while (strcmp (temp_string, "0") != 0)
        {
                if (ferror (fp->fp))
                {
                        fprintf (stderr,
                          (_("Error in %s () while reading from: %s in line: %d.\n")),
                          __FUNCTION__, fp->filename, fp->line_number);
                        fclose (fp->fp);
                        /* Clean up. */
                        free (temp_string);
                        return (NULL);
                }
                else if (strcmp (temp_string, "90") == 0)
                {
                        /* Now follows a string containing the
                         * number of bytes value. */
                        (fp->line_number)++;
                        fscanf (fp->fp, "%d\n", &thumbnail->number_of_bytes);
                }
                else if (strcmp (temp_string, "310") == 0)
                {
                        /* Now follows a string containing additional
                         * proprietary data. */
                        (fp->line_number)++;
                        fscanf (fp->fp, "%s\n", thumbnail->preview_image_data[i]);
                        preview_data_length = preview_data_length + strlen (thumbnail->preview_image_data[i]);
                        i++;
                }
                else if (strcmp (temp_string, "999") == 0)
                {
                        /* Now follows a string containing a comment. */
                        (fp->line_number)++;
                        fscanf (fp->fp, "%s\n", temp_string);
                        fprintf (stdout, "DXF comment: %s\n", temp_string);
                }
                else
                {
                        fprintf (stderr,
                          (_("Warning in %s () unknown string tag found while reading from: %s in line: %d.\n")),
                          __FUNCTION__, fp->filename, fp->line_number);
                }
        }
        /* Handle omitted members and/or illegal values. */
        if (preview_data_length != thumbnail->number_of_bytes)
        {
                        fprintf (stderr,
                          (_("Warning in %s () read %d preview data bytes from %s while %d were expected.\n")),
                          __FUNCTION__, preview_data_length,
                          fp->filename, thumbnail->number_of_bytes);
        }
        /* Clean up. */
        free (temp_string);
#if DEBUG
        DXF_DEBUG_END
#endif
        return (thumbnail);
}


int
dxf_thumbnail_write
(
        DxfFile *fp,
        DxfThumbnail *thumbnail
)
{
#if DEBUG
        DXF_DEBUG_BEGIN
#endif
        char *dxf_entity_name = strdup ("THUMBNAILIMAGE");
        int i;

        /* Do some basic checks. */
        if (fp == NULL)
        {
                fprintf (stderr,
                  (_("Error in %s () a NULL file pointer was passed.\n")),
                  __FUNCTION__);
                /* Clean up. */
                free (dxf_entity_name);
                return (EXIT_FAILURE);
        }
        if (thumbnail == NULL)
        {
                fprintf (stderr,
                  (_("Error in %s () a NULL pointer was passed.\n")),
                  __FUNCTION__);
                /* Clean up. */
                free (dxf_entity_name);
                return (EXIT_FAILURE);
        }
        if (thumbnail->number_of_bytes < 1)
        {
                fprintf (stderr,
                  (_("Error in %s () number of bytes was 0 or less.\n")),
                  __FUNCTION__);
                /* Clean up. */
                free (dxf_entity_name);
                return (EXIT_FAILURE);
        }
        if (fp->acad_version_number < AutoCAD_2000)
        {
                fprintf (stderr,
                  (_("Warning in %s () illegal DXF version for this entity.\n")),
                  __FUNCTION__);
        }
        /* Start writing output. */
        fprintf (fp->fp, "  0\n%s\n", dxf_entity_name);
        fprintf (fp->fp, " 90\n%d\n", thumbnail->number_of_bytes);
        i = 0;
        while (strlen (thumbnail->preview_image_data[i]) > 0)
        {
                fprintf (fp->fp, "310\n%s\n", thumbnail->preview_image_data[i]);
                i++;
        }
        /* Clean up. */
        free (dxf_entity_name);
#if DEBUG
        DXF_DEBUG_END
#endif
        return (EXIT_SUCCESS);
}


int
dxf_thumbnail_free
(
        DxfThumbnail *thumbnail
)
{
#if DEBUG
        DXF_DEBUG_BEGIN
#endif
        int i;

        /* Do some basic checks. */
        if (thumbnail == NULL)
        {
                fprintf (stderr,
                  (_("Error in %s () a NULL pointer was passed.\n")),
                  __FUNCTION__);
                return (EXIT_FAILURE);
        }
        for (i = 0; i < DXF_MAX_PARAM; i++)
        {
                free (thumbnail->preview_image_data[i]);
        }
        free (thumbnail);
        thumbnail = NULL;
#if DEBUG
        DXF_DEBUG_END
#endif
        return (EXIT_SUCCESS);
}


/* EOF */