pdfio/pdfio-content.c

//
// Content helper functions for pdfio.
//
// Copyright © 2021 by Michael R Sweet.
//
// Licensed under Apache License v2.0.  See the file "LICENSE" for more
// information.
//

//
// Include necessary headers...
//

#include "pdfio-content.h"
#include <math.h>


//
// Local functions...
//

static bool	write_string(pdfio_stream_t *st, const char *s);


//
// 'pdfioContentBeginText()' - Begin a text block.
//

bool					// O - `true` on success, `false` on failure
pdfioContentBeginText(
    pdfio_stream_t *st)			// I - Stream
{
  return (pdfioStreamPuts(st, "BT\n"));
}


//
// 'pdfioContentClip()' - Clip output to the current path.
//

bool					// O - `true` on success, `false` on failure
pdfioContentClip(
    pdfio_stream_t *st,			// I - Stream
    bool           even_odd)		// I - Even/odd fill vs. non-zero winding rule
{
  return (pdfioStreamPuts(st, even_odd ? "W*\n" : "W\n"));
}


//
// 'pdfioContentDrawImage()' - Draw an image object.
//
// The object name must be part of the page dictionary resources, typically
// using the @link pdfioPageDictAddImage@ function.
//

bool					// O - `true` on success, `false` on failure
pdfioContentDrawImage(
    pdfio_stream_t *st,			// I - Stream
    const char     *name)		// I - Image name
{
  return (pdfioStreamPrintf(st, "/%s Do\n", name));
}


//
// 'pdfioContentEndText()' - End a text block.
//

bool					// O - `true` on success, `false` on failure
pdfioContentEndText(pdfio_stream_t *st)	// I - Stream
{
  return (pdfioStreamPuts(st, "ET\n"));
}


//
// 'pdfioContentFill()' - Fill the current path.
//

bool					// O - `true` on success, `false` on failure
pdfioContentFill(
    pdfio_stream_t *st,			// I - Stream
    bool           even_odd)		// I - Even/odd fill vs. non-zero winding rule
{
  return (pdfioStreamPuts(st, even_odd ? "f*\n" : "f\n"));
}


//
// 'pdfioContentFillAndStroke()' - Fill and stroke the current path.
//

bool					// O - `true` on success, `false` on failure
pdfioContentFillAndStroke(
    pdfio_stream_t *st,			// I - Stream
    bool           even_odd)		// I - Even/odd fill vs. non-zero winding
{
  return (pdfioStreamPuts(st, even_odd ? "B*\n" : "B\n"));
}


//
// 'pdfioContentMatrixConcat()' - Concatenate a matrix to the current graphics
//                                state.
//

bool					// O - `true` on success, `false` on failure
pdfioContentMatrixConcat(
    pdfio_stream_t *st,			// I - Stream
    pdfio_matrix_t m)			// I - Transform matrix
{
  return (pdfioStreamPrintf(st, "%g %g %g %g %g %g cm\n", m[0][0], m[0][1], m[1][0], m[1][1], m[2][0], m[2][1]));
}


//
// 'pdfioContentMatrixRotate()' - Rotate the current transform matrix.
//

bool					// O - `true` on success, `false` on failure
pdfioContentMatrixRotate(
    pdfio_stream_t *st,			// I - Stream
    float          degrees)		// I - Rotation angle in degrees counter-clockwise
{
  double dcos = cos(degrees / M_PI);	// Cosine
  double dsin = sin(degrees / M_PI);	// Sine

  return (pdfioStreamPrintf(st, "%g %g %g %g 0 0 cm\n", dcos, -dsin, dsin, dcos));
}


//
// 'pdfioContentMatrixScale()' - Scale the current transform matrix.
//

bool					// O - `true` on success, `false` on failure
pdfioContentMatrixScale(
    pdfio_stream_t *st,			// I - Stream
    float          sx,			// I - X scale
    float          sy)			// I - Y scale
{
  return (pdfioStreamPrintf(st, "%g 0 0 %g 0 0 cm\n", sx, sy));
}


//
// 'pdfioContentMatrixTranslate()' - Translate the current transform matrix.
//

bool					// O - `true` on success, `false` on failure
pdfioContentMatrixTranslate(
    pdfio_stream_t *st,			// I - Stream
    float          tx,			// I - X offset
    float          ty)			// I - Y offset
{
  return (pdfioStreamPrintf(st, "1 0 0 1 %g %g cm\n", tx, ty));
}


//
// 'pdfioContentPathClose()' - Close the current path.
//

bool					// O - `true` on success, `false` on failure
pdfioContentPathClose(
    pdfio_stream_t *st)			// I - Stream
{
  return (pdfioStreamPuts(st, "h\n"));
}


//
// 'pdfioContentPathCurve()' - Add a Bezier curve with two control points.
//

bool					// O - `true` on success, `false` on failure
pdfioContentPathCurve(
    pdfio_stream_t *st,			// I - Stream
    float          x1,			// I - X position 1
    float          y1,			// I - Y position 1
    float          x2,			// I - X position 2
    float          y2,			// I - Y position 2
    float          x3,			// I - X position 3
    float          y3)			// I - Y position 3
{
  return (pdfioStreamPrintf(st, "%g %g %g %g %g %g c\n", x1, y1, x2, y2, x3, y3));
}


//
// 'pdfioContentPathCurve13()' - Add a Bezier curve with an initial control point.
//

bool					// O - `true` on success, `false` on failure
pdfioContentPathCurve13(
    pdfio_stream_t *st,			// I - Stream
    float          x1,			// I - X position 1
    float          y1,			// I - Y position 1
    float          x3,			// I - X position 3
    float          y3)			// I - Y position 3
{
  return (pdfioStreamPrintf(st, "%g %g %g %g v\n", x1, y1, x3, y3));
}


//
// 'pdfioContentPathCurve23()' - Add a Bezier curve with a trailing control point.
//

bool					// O - `true` on success, `false` on failure
pdfioContentPathCurve23(
    pdfio_stream_t *st,			// I - Stream
    float          x2,			// I - X position 2
    float          y2,			// I - Y position 2
    float          x3,			// I - X position 3
    float          y3)			// I - Y position 3
{
  return (pdfioStreamPrintf(st, "%g %g %g %g y\n", x2, y2, x3, y3));
}


//
// 'pdfioContentPathLineTo()' - Add a straight line to the current path.
//

bool					// O - `true` on success, `false` on failure
pdfioContentPathLineTo(
    pdfio_stream_t *st,			// I - Stream
    float          x,			// I - X position
    float          y)			// I - Y position
{
  return (pdfioStreamPrintf(st, "%g %g l\n", x, y));
}


//
// 'pdfioContentPathMoveTo()' - Start a new subpath.
//

bool					// O - `true` on success, `false` on failure
pdfioContentPathMoveTo(
    pdfio_stream_t *st,			// I - Stream
    float          x,			// I - X position
    float          y)			// I - Y position
{
  return (pdfioStreamPrintf(st, "%g %g m\n", x, y));
}


//
// 'pdfioContentPathRect()' - Add a rectangle to the current path.
//

bool					// O - `true` on success, `false` on failure
pdfioContentPathRect(
    pdfio_stream_t *st,			// I - Stream
    pdfio_rect_t   *rect)		// I - Rectangle
{
  return (pdfioStreamPrintf(st, "%g %g %g %g re\n", rect->x1, rect->y1, rect->x2 - rect->x1, rect->y2 - rect->y1));
}


//
// 'pdfioContentRestore()' - Restore a previous graphics state.
//

bool					// O - `true` on success, `false` on failure
pdfioContentRestore(
    pdfio_stream_t *st)			// I - Stream
{
  return (pdfioStreamPuts(st, "Q\n"));
}


//
// 'pdfioContentSave()' - Save the current graphics state.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSave(pdfio_stream_t *st)	// I - Stream
{
  return (pdfioStreamPuts(st, "q\n"));
}


//
// 'pdfioContentSetDashPattern()' - Set the stroke pattern.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetDashPattern(
    pdfio_stream_t *st,			// I - Stream
    int            phase,		// I - Phase (offset within pattern)
    int            on,			// I - On length
    int            off)			// I - Off length
{
  return (pdfioStreamPrintf(st, "[%d %d] %d d\n", on, off, phase));
}


//
// 'pdfioContentSetFillColorDeviceCMYK()' - Set device CMYK fill color.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetFillColorDeviceCMYK(
    pdfio_stream_t *st,			// I - Stream
    float          c,			// I - Cyan value (0.0 to 1.0)
    float          m,			// I - Magenta value (0.0 to 1.0)
    float          y,			// I - Yellow value (0.0 to 1.0)
    float          k)			// I - Black value (0.0 to 1.0)
{
  return (pdfioStreamPrintf(st, "%g %g %g %g k\n", c, m, y, k));
}


//
// 'pdfioContentSetFillColorDeviceGray()' - Set the device gray fill color.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetFillColorDeviceGray(
    pdfio_stream_t *st,			// I - Stream
    float          g)			// I - Gray value (0.0 to 1.0)
{
  return (pdfioStreamPrintf(st, "%g g\n", g));
}


//
// 'pdfioContentSetFillColorDeviceRGB()' - Set the device RGB fill color.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetFillColorDeviceRGB(
    pdfio_stream_t *st,			// I - Stream
    float          r,			// I - Red value (0.0 to 1.0)
    float          g,			// I - Green value (0.0 to 1.0)
    float          b)			// I - Blue value (0.0 to 1.0)
{
  return (pdfioStreamPrintf(st, "%g %g %g rg\n", r, g, b));
}


//
// 'pdfioContentSetFillColorGray()' - Set the calibrated gray fill color.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetFillColorGray(
    pdfio_stream_t *st,			// I - Stream
    float          g)			// I - Gray value (0.0 to 1.0)
{
  return (pdfioStreamPrintf(st, "%g sc\n", g));
}


//
// 'pdfioContentSetFillColorRGB()' - Set the calibrated RGB fill color.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetFillColorRGB(
    pdfio_stream_t *st,			// I - Stream
    float          r,			// I - Red value (0.0 to 1.0)
    float          g,			// I - Green value (0.0 to 1.0)
    float          b)			// I - Blue value (0.0 to 1.0)
{
  return (pdfioStreamPrintf(st, "%g %g %g sc\n", r, g, b));
}


//
// 'pdfioContentSetFillColorSpace()' - Set the fill colorspace.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetFillColorSpace(
    pdfio_stream_t *st,			// I - Stream
    const char     *name)		// I - Color space name
{
  return (pdfioStreamPrintf(st, "/%s cs\n", name));
}


//
// 'pdfioContentSetFlatness()' - Set the flatness tolerance.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetFlatness(
    pdfio_stream_t *st,			// I - Stream
    float          flatness)		// I - Flatness value (0.0 to 100.0)
{
  return (pdfioStreamPrintf(st, "%g i\n", flatness));
}


//
// 'pdfioContentSetLineCap()' - Set the line ends style.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetLineCap(
    pdfio_stream_t  *st,		// I - Stream
    pdfio_linecap_t lc)			// I - Line cap value
{
  return (pdfioStreamPrintf(st, "%d J\n", lc));
}


//
// 'pdfioContentSetLineJoin()' - Set the line joining style.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetLineJoin(
    pdfio_stream_t   *st,		// I - Stream
    pdfio_linejoin_t lj)		// I - Line join value
{
  return (pdfioStreamPrintf(st, "%d j\n", lj));
}


//
// 'pdfioContentSetLineWidth()' - Set the line width.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetLineWidth(
    pdfio_stream_t *st,			// I - Stream
    float          width)		// I - Line width value
{
  return (pdfioStreamPrintf(st, "%g w\n", width));
}


//
// 'pdfioContentSetMiterLimit()' - Set the miter limit.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetMiterLimit(
    pdfio_stream_t *st,			// I - Stream
    float          limit)		// I - Miter limit value
{
  return (pdfioStreamPrintf(st, "%g M\n", limit));
}


//
// 'pdfioContentSetStrokeColorDeviceCMYK()' - Set the device CMYK stroke color.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetStrokeColorDeviceCMYK(
    pdfio_stream_t *st,			// I - Stream
    float          c,			// I - Cyan value (0.0 to 1.0)
    float          m,			// I - Magenta value (0.0 to 1.0)
    float          y,			// I - Yellow value (0.0 to 1.0)
    float          k)			// I - Black value (0.0 to 1.0)
{
  return (pdfioStreamPrintf(st, "%g %g %g %g K\n", c, m, y, k));
}


//
// 'pdfioContentSetStrokeColorDeviceGray()' - Set the device gray stroke color.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetStrokeColorDeviceGray(
    pdfio_stream_t *st,			// I - Stream
    float          g)			// I - Gray value (0.0 to 1.0)
{
  return (pdfioStreamPrintf(st, "%g G\n", g));
}


//
// 'pdfioContentSetStrokeColorDeviceRGB()' - Set the device RGB stroke color.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetStrokeColorDeviceRGB(
    pdfio_stream_t *st,			// I - Stream
    float          r,			// I - Red value (0.0 to 1.0)
    float          g,			// I - Green value (0.0 to 1.0)
    float          b)			// I - Blue value (0.0 to 1.0)
{
  return (pdfioStreamPrintf(st, "%g %g %g RG\n", r, g, b));
}


//
// 'pdfioContentSetStrokeColorGray()' - Set the calibrated gray stroke color.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetStrokeColorGray(
    pdfio_stream_t *st,			// I - Stream
    float          g)			// I - Gray value (0.0 to 1.0)
{
  return (pdfioStreamPrintf(st, "%g SC\n", g));
}


//
// 'pdfioContentSetStrokeColorRGB()' - Set the calibrated RGB stroke color.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetStrokeColorRGB(
    pdfio_stream_t *st,			// I - Stream
    float          r,			// I - Red value (0.0 to 1.0)
    float          g,			// I - Green value (0.0 to 1.0)
    float          b)			// I - Blue value (0.0 to 1.0)
{
  return (pdfioStreamPrintf(st, "%g %g %g SC\n", r, g, b));
}


//
// 'pdfioContentSetStrokeColorSpace()' - Set the stroke color space.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetStrokeColorSpace(
    pdfio_stream_t *st,			// I - Stream
    const char     *name)		// I - Color space name
{
  return (pdfioStreamPrintf(st, "/%s CS\n", name));
}


//
// 'pdfioContentSetTextCharacterSpacing()' - Set the spacing between characters.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetTextCharacterSpacing(
    pdfio_stream_t *st,			// I - Stream
    float          spacing)		// I - Character spacing
{
  return (pdfioStreamPrintf(st, "%g Tc\n", spacing));
}


//
// 'pdfioContentSetTextFont()' - Set the text font and size.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetTextFont(
    pdfio_stream_t *st,			// I - Stream
    const char     *name,		// I - Font name
    float          size)		// I - Font size
{
  return (pdfioStreamPrintf(st, "/%s %g Tf\n", name, size));
}


//
// 'pdfioContentSetTextLeading()' - Set text leading (line height) value.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetTextLeading(
    pdfio_stream_t *st,			// I - Stream
    float          leading)		// I - Leading (line height) value
{
  return (pdfioStreamPrintf(st, "%g TL\n", leading));
}


//
// 'pdfioContentSetTextMatrix()' - Set the text transform matrix.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetTextMatrix(
    pdfio_stream_t *st,			// I - Stream
    pdfio_matrix_t m)			// I - Transform matrix
{
  return (pdfioStreamPrintf(st, "%g %g %g %g %g %g Tm\n", m[0][0], m[0][1], m[1][0], m[1][1], m[2][0], m[2][1]));
}


//
// 'pdfioContentSetTextRenderingMode()' - Set the text rendering mode.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetTextRenderingMode(
    pdfio_stream_t        *st,		// I - Stream
    pdfio_textrendering_t mode)		// I - Text rendering mode
{
  return (pdfioStreamPrintf(st, "%d Tr\n", mode));
}


//
// 'pdfioContentSetTextRise()' - Set the text baseline offset.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetTextRise(
    pdfio_stream_t *st,			// I - Stream
    float          rise)		// I - Y offset
{
  return (pdfioStreamPrintf(st, "%g Ts\n", rise));
}


//
// 'pdfioContentSetTextWordSpacing()' - Set the inter-word spacing.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetTextWordSpacing(
    pdfio_stream_t *st,			// I - Stream
    float          spacing)		// I - Spacing between words
{
  return (pdfioStreamPrintf(st, "%g Tw\n", spacing));
}


//
// 'pdfioContentSetTextXScaling()' - Set the horizontal scaling value.
//

bool					// O - `true` on success, `false` on failure
pdfioContentSetTextXScaling(
    pdfio_stream_t *st,			// I - Stream
    float          percent)		// I - Horizontal scaling in percent
{
  return (pdfioStreamPrintf(st, "%g Tz\n", percent));
}


//
// 'pdfioContentStroke()' - Stroke the current path.
//

bool					// O - `true` on success, `false` on failure
pdfioContentStroke(pdfio_stream_t *st)	// I - Stream
{
  return (pdfioStreamPuts(st, "S\n"));
}


//
// 'pdfioContentTextMoveLine()' - Move to the next line and offset.
//

bool					// O - `true` on success, `false` on failure
pdfioContentTextMoveLine(
    pdfio_stream_t *st,			// I - Stream
    float          tx,			// I - X offset
    float          ty)			// I - Y offset
{
  return (pdfioStreamPrintf(st, "%g %g TD\n", tx, ty));
}


//
// 'pdfioContentTextMoveTo()' - Offset within the current line.
//

bool					// O - `true` on success, `false` on failure
pdfioContentTextMoveTo(
    pdfio_stream_t *st,			// I - Stream
    float          tx,			// I - X offset
    float          ty)			// I - Y offset
{
  return (pdfioStreamPrintf(st, "%g %g Td\n", tx, ty));
}


//
// 'pdfioContentTextNextLine()' - Move to the next line.
//

bool					// O - `true` on success, `false` on failure
pdfioContentTextNextLine(
    pdfio_stream_t *st)			// I - Stream
{
  return (pdfioStreamPuts(st, "T*\n"));
}


//
// 'pdfioContentTextShow()' - Show text.
//

bool					// O - `true` on success, `false` on failure
pdfioContentTextShow(
    pdfio_stream_t *st,			// I - Stream
    const char     *s,			// I - String to show
    bool           new_line)		// I - Advance to the next line afterwards
{
  write_string(st, s);

  if (new_line)
    return (pdfioStreamPuts(st, "\'\n"));
  else
    return (pdfioStreamPuts(st, "Tj\n"));
}


//
// 'pdfioContentTextShowJustified()' - Show justified text.
//

bool					// O - `true` on success, `false` on failure
pdfioContentTextShowJustified(
    pdfio_stream_t     *st,		// I - Stream
    size_t             num_fragments,	// I - Number of text fragments
    const float        *offsets,	// I - Text offsets before fragments
    const char * const *fragments)	// I - Text fragments
{
  size_t	i;			// Looping var


  // Write an array of offsets and string fragments...
  if (!pdfioStreamPuts(st, "["))
    return (false);

  for (i = 0; i < num_fragments; i ++)
  {
    if (offsets[i] != 0.0f)
    {
      if (!pdfioStreamPrintf(st, "%g", offsets[i]))
        return (false);
    }

    if (fragments[i])
    {
      if (!write_string(st, fragments[i]))
        return (false);
    }
  }

  return (pdfioStreamPuts(st, "]TJ\n"));
}


//
// 'pdfioPageDictAddICCColorSpace()' - Add an ICC color space to the page
//                                     dictionary.
//

bool					// O - `true` on success, `false` on failure
pdfioPageDictAddICCColorSpace(
    pdfio_dict_t *dict,			// I - Page dictionary
    const char   *name,			// I - Color space name
    pdfio_obj_t  *obj)			// I - ICC profile object
{
  (void)dict;
  (void)name;
  (void)obj;

  return (false);
}


//
// 'pdfioPageDictAddCalibratedColorSpace()' - Add a calibrated color space to
//                                            the page dictionary.
//

bool					// O - `true` on success, `false` on failure
pdfioPageDictAddCalibratedColorSpace(
    pdfio_dict_t *dict,			// I - Page dictionary
    const char   *name,			// I - Color space name
    size_t       num_colors,		// I - Number of color components
    const float  *white_point,		// I - CIE XYZ white point
    float        gamma)			// I - Gamma value
{
  (void)dict;
  (void)name;
  (void)num_colors;
  (void)white_point;
  (void)gamma;

  return (false);
}


//
// 'pdfioPageDictAddFont()' - Add a font object to the page dictionary.
//

bool					// O - `true` on success, `false` on failure
pdfioPageDictAddFont(
    pdfio_dict_t *dict,			// I - Page dictionary
    const char   *name,			// I - Font name
    pdfio_obj_t  *obj)			// I - Font object
{
  (void)dict;
  (void)name;
  (void)obj;

  return (false);
}


//
// 'pdfioPageDictAddImage()' - Add an image object to the page dictionary.
//

bool					// O - `true` on success, `false` on failure
pdfioPageDictAddImage(
    pdfio_dict_t *dict,			// I - Page dictionary
    const char   *name,			// I - Image name
    pdfio_obj_t  *obj)			// I - Image object
{
  (void)dict;
  (void)name;
  (void)obj;

  return (false);
}


//
// 'pdfioFileCreateFontObject()' - Add a font object to a PDF file.
//

pdfio_obj_t *				// O - Object
pdfioFileCreateFontObject(
    pdfio_file_t *pdf,			// I - PDF file
    const char   *filename)		// I - Filename
{
  (void)pdf;
  (void)filename;

  return (NULL);
}


//
// 'pdfioFileCreateICCProfileObject()' - Add an ICC profile object to a PDF file.
//

pdfio_obj_t *				// O - Object
pdfioFileCreateICCProfileObject(
    pdfio_file_t *pdf,			// I - PDF file
    const char   *filename)		// I - Filename
{
  (void)pdf;
  (void)filename;

  return (NULL);
}


//
// 'pdfioFileCreateImageObject()' - Add an image object to a PDF file.
//

pdfio_obj_t *				// O - Object
pdfioFileCreateImageObject(
    pdfio_file_t *pdf,			// I - PDF file
    const char   *filename,		// I - Filename
    bool         interpolate)		// I - Interpolate image data?
{
  (void)pdf;
  (void)filename;
  (void)interpolate;

  return (NULL);
}


//
// 'write_string()' - Write a PDF string.
//

static bool				// O - `true` on success, `false` otherwise
write_string(pdfio_stream_t *st,	// I - Stream
             const char     *s)		// I - String
{
  const char	*ptr;			// Pointer into string


  // Determine whether this is Unicode or just ASCII...
  for (ptr = s; *ptr; ptr ++)
  {
    if (*ptr & 0x80)
      break;
  }

  if (*ptr)
  {
    // Unicode string...
    int		ch;			// Unicode character

    if (!pdfioStreamPuts(st, "("))
      return (false);

    for (ptr = s; *ptr; ptr ++)
    {
      if ((*ptr & 0xe0) == 0xc0)
      {
        // Two-byte UTF-8
        ch = ((ptr[0] & 0x1f) << 6) | (ptr[1] & 0x3f);
        ptr ++;
      }
      else if ((*ptr & 0xf0) == 0xe0)
      {
        // Three-byte UTF-8
        ch = ((ptr[0] & 0x0f) << 12) | ((ptr[1] & 0x3f) << 6) | (ptr[2] & 0x3f);
        ptr += 2;
      }
      else if ((*ptr & 0xf8) == 0xf0)
      {
        // Four-byte UTF-8
        ch = ((ptr[0] & 0x07) << 18) | ((ptr[1] & 0x3f) << 12) | ((ptr[2] & 0x3f) << 6) | (ptr[3] & 0x3f);
        ptr += 3;
      }
      else
        ch = *ptr & 255;

      // Write a two-byte character...
      if (!pdfioStreamPrintf(st, "%04X", ch))
        return (false);
    }
    if (!pdfioStreamPuts(st, ")"))
      return (false);
  }
  else
  {
    // ASCII string...
    const char	*start = s;		// Start of fragment
    int		level = 0;		// Paren level

    if (!pdfioStreamPuts(st, "("))
      return (false);

    for (ptr = start; *ptr; ptr ++)
    {
      if (*ptr == '\\' || (*ptr == ')' && level == 0) || *ptr < ' ')
      {
        if (ptr > start)
        {
          if (!pdfioStreamWrite(st, start, (size_t)(ptr - start)))
            return (false);

          start = ptr + 1;
	}

        if (*ptr < ' ')
        {
          if (!pdfioStreamPrintf(st, "\\%03o", *ptr))
            return (false);
        }
        else if (!pdfioStreamPrintf(st, "\\%c", *ptr))
          return (false);
      }
      else if (*ptr == '(')
        level ++;
      else if (*ptr == ')')
        level --;
    }

    if (ptr > start)
    {
      if (!pdfioStreamPrintf(st, "%s)", start))
        return (false);
    }
    else if (!pdfioStreamPuts(st, ")"))
      return (false);
  }

  return (true);
}