/usr/lib/pike7.8/modules/_Image_PS.pmod is in pike7.8-image 7.8.866-5build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//! @appears Image.PS
//! Codec for the Adobe page description language PostScript.
//! Uses Ghostscript for decoding or built-in support.
protected 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.
//! @member int(0..1) "force_gs"
//! Forces use of Ghostscript for EPS files instead
//! of Pikes native support.
//! @member int(0..1) "eps_crop"
//! Use -dEPSCrop option to Ghostscript to crop the
//! BoundingBox for a EPS file.
//! @member int(0..1) "cie_color"
//! Use -dUseCIEColor option to Ghostscript for
//! mapping color values through a CIE color space.
//! @member string "file"
//! Filename to read. If this is specified, it will be
//! passed along to the @tt{gs@} binary, so that it can
//! read the file directly. If this is specified @[data]
//! may be set to @expr{0@} (zero).
//! @endmapping
//!
//! @note
//! Some versions of @tt{gs@} on MacOS X have problems with
//! reading files on stdin. If this occurrs, try writing to
//! a plain file and specifying the @tt{file@} option.
//!
//! @note
//! @tt{gs@} versions 7.x and earlier don't support rendering
//! of EPSes if they are specified with the @tt{file@} option.
//! If this is a problem, upgrade to @tt{gs@} version 8.x or
//! later.
object decode( string data, mapping|void options )
{
if(!options) options = ([]);
if (data) {
if(has_prefix(data, "\xc5\xd0\xd3\xc6")) {
// DOS EPS Binary Header.
int ps_start, ps_len, meta_start, meta_len, tiff_start, tiff_len, sum;
sscanf(data, "%*4c%-4c%-4c%-4c%-4c%-4c%-4c%-2c",
ps_start, ps_len, meta_start, meta_len,
tiff_start, tiff_len, sum);
#if constant(Image.TIFF.decode)
if (tiff_start && tiff_len) {
return Image.TIFF.decode(data[tiff_start..tiff_start + tiff_len-1]);
}
#endif
data = data[ps_start..ps_start+ps_len-1];
}
if(data[0..3] != "%!PS")
error("This is not a postscript file!\n");
if(!options->force_gs)
{
if (has_prefix(data, "%!PS-Adobe-3.0 EPSF-3.0")) {
int width, height, bits, ncols;
int nbws, width2, encoding;
string init_tag;
if ((sscanf(data,
"%*s%%ImageData:%*[ ]%d%*[ ]%d%*[ ]%d%*[ ]%d%"
"*[ ]%d%*[ ]%d%*[ ]%d%*[ ]\"%s\"",
width, height, bits, ncols,
nbws, width2, encoding, init_tag) > 7) &&
(width == width2) && (width > 0) && (height > 0) && (bits == 8) &&
(< 1, 2 >)[encoding]) {
// 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 (encoding == 2) {
// Decode the hex data.
#if constant(String.hex2string)
raw = String.hex2string(raw - term);
#else
raw += Crypto.hex_to_string(raw - term);
#endif
}
if (sizeof(raw) == width*height*(ncols+nbws)) {
array(string) rows = raw/width;
if ((<3,4>)[ncols]) {
// RGB or CMYK image.
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];
}
}
if (ncols == 3) {
return Image.Image(width, height, "rgb", @channels);
}
return Image.Image(width, height, "adjusted_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);
}
}
}
}
}
}
Stdio.File fd = Stdio.File();
object fd2 = fd->pipe();
Stdio.File fd3 = Stdio.File();
object fd4 = fd3->pipe();
array command = ({
options->binary||find_in_path("gs")||("/bin/sh -c gs "),
"-quiet",
"-sDEVICE="+(options->device||"ppmraw"),
"-r"+(options->dpi||100),
"-dBATCH",
"-dNOPAUSE"});
if(options->eps_crop)
command += ({"-dEPSCrop"});
if(options->cie_color)
command += ({"-dUseCIEColor"});
command += ({
"-sOutputFile=-",
options->file || "-",
"-c",
"quit",
});
Process.Process pid = Process.create_process( command, ([
"stdin":fd,
"stdout":fd4,
"stderr":fd4,
]));
fd->close();
fd4->close();
// Backend to use.
Pike.Backend be = Pike.Backend();
// Kill the gs binary after 30 seconds in case it hangs.
mixed co =
be->call_out(lambda(Process.Process pid) {
if (!pid->status()) {
pid->kill(9);
}
}, 30, pid);
if(!options->file)
{
if(!has_value(data, "showpage"))
data += "\nshowpage\n";
be->add_file(fd2);
Stdio.sendfile(({ data }), 0, 0, sizeof(data), 0, fd2,
lambda(int n) {
fd2->close();
});
} else {
fd2->close();
}
string output = "";
be->add_file(fd3);
fd3->set_nonblocking(lambda(mixed ignored, string s) {
output += s;
}, 0,
lambda() {
fd3->close();
destruct(fd3);
});
mixed err = catch {
while (fd3) {
be(1.0);
}
};
#if 0
if (err) {
werror("Backend failed: %s\n", describe_backtrace(err));
}
#endif
be->remove_call_out(co);
int ret_code = pid->wait();
if(ret_code)
error("Ghostscript failed with exit code: %O:\n%s\n", ret_code, output);
object i= Image.PNM.decode( output );
if (data) {
if(data && sscanf(data, "%*s\n%%%%BoundingBox: %s\n", string bbox) == 2 &&
!options->eps_crop)
{
int x0,x1,y0,y1;
sscanf(bbox, "%d %d %d %d", x0,y0,x1,y1 );
int llx = (int)((x0/72.0) * (options->dpi||100)+0.01);
int lly = (int)((y0/72.0) * (options->dpi||100)+0.01);
int urx = (int)((x1/72.0) * (options->dpi||100)+0.01);
int ury = (int)((y1/72.0) * (options->dpi||100)+0.01);
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;
//! Decodes the header of the postscript @[data] into a mapping.
//!
//! @mapping
//! @member int "xsize"
//! @member int "ysize"
//! Size of image
//! @member string "type"
//! File type information as MIME type. Always "application/postscript".
//! @member string "color_space"
//! Color space of image. "GRAYSCALE", "LAB", RGB", "CMYK" or "UNKNOWN"
//! @endmapping
//!
public mapping decode_header(string data) {
if(has_prefix(data, "\xc5\xd0\xd3\xc6")) {
// DOS EPS Binary Header.
int ps_start, ps_len, meta_start, meta_len, tiff_start, tiff_len, sum;
sscanf(data, "%*4c%-4c%-4c%-4c%-4c%-4c%-4c%-2c",
ps_start, ps_len, meta_start, meta_len,
tiff_start, tiff_len, sum);
#if constant(Image.TIFF.decode_header)
if (tiff_start && tiff_len) {
return Image.TIFF.decode_header(data[tiff_start..tiff_start + tiff_len-1]);
}
#endif
data = data[ps_start..ps_start+ps_len-1];
}
if (has_prefix(data, "%!PS-Adobe-3.0 EPSF-3.0")) {
int width, height, bits, ncols;
int nbws, width2, encoding;
string init_tag;
if ((sscanf(data,
"%*s%%ImageData:%*[ ]%d%*[ ]%d%*[ ]%d%*[ ]%d%"
"*[ ]%d%*[ ]%d%*[ ]%d%*[ ]\"%s\"",
width, height, bits, ncols,
nbws, width2, encoding, init_tag) > 7) &&
(width == width2) && (width > 0) && (height > 0) && (bits == 8) &&
(< 1, 2 >)[encoding]) {
string color_space;
switch (ncols) {
case 1:
color_space = "GRAYSCALE";
break;
case 2:
color_space = "LAB";
break;
case 3:
color_space = "RGB";
break;
case 4:
color_space = "CMYK";
break;
default:
color_space = "UNKNOWN";
break;
}
return ([ "type": "application/postscript",
"xsize": width,
"ysize": height,
"color_space": color_space ]);
}
}
return 0;
}
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