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#pike __REAL_VERSION__ 
 
//! @appears Image.PS 
//! Codec for the Adobe page description language PostScript. 
//! Uses Ghostscript for decoding. 
 
static string find_in_path( string file ) 
{ 
  string path=getenv("PATH"); 
  foreach(path ? path/":" : ({}) , path) 
    if(file_stat(path=combine_path(path,file))) 
      return path; 
} 
 
//! Decodes the postscript @[data] into an image object 
//! using Ghostscript. 
//! @param options 
//!   Optional decoding parameters. 
//!   @mapping 
//!     @member int "dpi" 
//!       The resolution the image should be rendered in. 
//!       Defaults to 100. 
//!     @member string "device" 
//!       The selected Ghostscript device. Defaults to "ppmraw". 
//!     @member string "binary" 
//!       Path to the Ghostscript binary to be used. If missing 
//!       the environment paths will be searched for a file "gs" 
//!       to be used instead. 
//!   @endmapping 
object decode( string data, mapping|void options ) 
{ 
  if(data[0..3] != "%!PS") 
    error("This is not a postscript file!\n"); 
 
  if (has_prefix(data, "%!PS-Adobe-3.0 EPSF-3.0")) { 
    int width, height, bits, ncols; 
    int nbws, width2, unknown; 
    string init_tag; 
    if ((sscanf(data, 
                "%*s%%ImageData:%*[ ]%d%*[ ]%d%*[ ]%d%*[ ]%d%" 
                "*[ ]%d%*[ ]%d%*[ ]%d%*[ ]\"%s\"", 
                width, height, bits, ncols,  
                nbws, width2, unknown, init_tag) > 7) && 
        (width == width2) && (width > 0) && (height > 0) && (bits == 8)) { 
      // Image data present. 
      int len; 
      string term; 
      string raw; 
      if ((sscanf(data, "%*s%%%%BeginBinary:%*[ ]%d%[\r\n]%s", 
                  len, term, raw) == 5) && 
          (len>0) && has_prefix(raw, init_tag + term)) { 
        raw = raw[sizeof(init_tag+term)..len-1]; 
        if (sizeof(raw) == width*height*(ncols+nbws)) { 
          array(string) rows = raw/width; 
          if (ncols) { 
            array(string) channels = allocate(ncols, ""); 
            int c; 
            for (c = 0; c < ncols; c++) { 
              int i; 
              for (i = c; i < sizeof(rows); i += ncols+nbws) { 
                channels[c] += rows[i]; 
              } 
            } 
            return Image.Image(width, height, "cmyk", @channels); 
          } 
          string grey = ""; 
          int i; 
          for(i = ncols; i < sizeof(rows); i += ncols+nbws) { 
            grey += rows[i]; 
          } 
          return Image.Image(width, height, "rgb", grey, grey, grey); 
        } 
      } 
    } 
  } 
 
  if(!options) options = ([]); 
  int llx, lly; 
  int urx, ury; 
 
  Stdio.File fd = Stdio.File(); 
  object fd2 = fd->pipe(); 
 
  Stdio.File fd3 = Stdio.File(); 
  object fd4 = fd3->pipe(); 
 
  if(sscanf(data, "%*s\n%%%%BoundingBox: %s\n", string bbox) == 2) 
  { 
    int x0,x1,y0,y1; 
    sscanf(bbox, "%d %d %d %d", x0,y0,x1,y1 ); 
    llx = (int)((x0/72.0) * (options->dpi||100)+0.01); 
    lly = (int)((y0/72.0) * (options->dpi||100)+0.01); 
    urx = (int)((x1/72.0) * (options->dpi||100)+0.01); 
    ury = (int)((y1/72.0) * (options->dpi||100)+0.01); 
  } 
 
  array command = ({ 
    options->binary||find_in_path("gs")||("/bin/sh -c gs "), 
    "-quiet", 
    "-sDEVICE="+(options->device||"ppmraw"), 
    "-r"+(options->dpi||100), 
    "-dNOPAUSE", 
    "-sOutputFile=-", 
    "-", 
    "-c quit 2>/dev/null"  
  }); 
 
  Process.create_process( command, ([ 
    "stdin":fd, 
    "stdout":fd3, 
    "stderr":fd3, 
  ])); 
  destruct(fd); 
  destruct(fd3); 
  fd2->write( data ); 
  if(!has_value(data, "showpage")) 
    fd2->write( "\nshowpage\n" ); 
  destruct(fd2); 
  object i= Image.PNM.decode( fd4->read() ); 
   
  if(urx && ury) 
    i = i->mirrory()->copy(llx,lly,urx,ury)->mirrory(); 
  return i; 
} 
 
//! Calls decode and returns the image in the "image" 
//! index of the mapping. This method is present for 
//! API reasons. 
mapping _decode( string data, mapping|void options ) 
{ 
  return ([ "image":decode( data,options ) ]); 
} 
 
 
 
//! Encodes the image object @[img] as a postscript 3.0 file. 
//! @param options 
//!   Optional extra encoding parameters. 
//!   @mapping 
//!     @member int "dpi" 
//!       The resolution of the encoded image. Defaults to 100. 
//!     @member int(0..1) "eps" 
//!       If the resulting image should be an eps instead of ps. 
//!       Defaults to 0, no. 
//!   @endmapping 
string encode(  object img, mapping|void options ) 
{ 
  int w = img->xsize(), h = img->ysize(); 
  string i = (string)img; 
  float scl = 72.0 / ((options&&options->dpi)||100); 
  img = 0; 
  string res; 
  res =("%!PS-Adobe-3.0\n" 
        "%%DocumentData: Clean8Bit\n" 
        "%%BoundingBox: 0 0 "+(int)ceil(w*scl)+" "+(int)ceil(h*scl)+"\n" 
        "%%EndComments\n" 
        "%%BeginProlog\n" 
        "30 dict begin\n" 
        "/tmpstr 256 string def\n" 
        "/dnl{currentfile tmpstr readline pop pop}bind def\n" 
        "/di{dnl gsave scale 2 copy pop string/pxdat exch def\n" 
        " 2 copy 8 [4 2 roll dup 0 0 4 2 roll neg 0 3 2 roll] {currentfile\n" 
        " pxdat readstring pop}false 3 colorimage grestore}bind def\n" 
        "%%EndProlog\n"); 
 
  res += sprintf("%d %d %f %f di\n", w, h, scl*w, scl*h); 
  res +="%%BeginData "+sizeof(i)+" Binary Bytes\n" + i +"\n%%EndData\n"; 
 
  if( !options || !options->eps ) 
    res += "showpage\n"; 
  res += "%%Trailer\n" "end\n" "%%EOF\n"; 
  return res; 
} 
 
//! Same as encode. Present for API reasons. 
function _encode = encode;