/*
* in_ps.cpp -- read PS and PDF files using GS
* by [email protected] at Tue Sep 30 12:33:11 CEST 2003
*/

#ifdef __GNUC__
#ifndef __clang__
#pragma implementation
#endif
#endif

#include "image.hpp"

#if USE_IN_PS || USE_IN_PDF

#include "error.hpp"
#include "gensio.hpp"
#include "helpere.hpp"
#include <string.h> /* memchr() */
#include <stdio.h> /* printf() */

#if OS_COTY==COTY_WIN9X || OS_COTY==COTY_WINNT
#  define GS "gswin32c"
#else
#  define GS "gs"
#endif

#endif /* USE_IN_PS || USE_IN_PDF */

/** Adds a Ghostscript invocation command. Works for both PS and PDF. */
static void add_gs_cmd(SimBuffer::B &cmd, SimBuffer::Flat const& hints) {
 cmd << GS " -r72 -q -dTextAlphaBits=4 -dGraphicsAlphaBits=4 -dLastPage=1 -sDEVICE=pnmraw -dDELAYSAFER -dBATCH -dNOPAUSE -sOutputFile=%D ";
 char const *p=hints(), *r;
 /* Dat: hints ends by ',' '\0' */
 // Files::FILEW(stdout) << hints << ";;\n";
 while (*p!=',') p++; /* Dat: safe, because hints is assumed to start and end by ',' */
 while (1) {
   assert(*p==',');
   if (*++p=='\0') break;
   if (p[0]=='g' && p[1]=='s' && p[2]=='=') {
     r=p+=3;
     while (*p!=',') p++;
     cmd.vi_write(r, p-r); /* Dat: -r... in here overrides -r72 above */
     cmd << ' ';
   } else {
     while (*p!=',') p++;
   }
 }
}

#if USE_IN_PS

/* !! -r144 and scale back..., also for PDF -- to enhance image quality */

#undef  DO_KEEP_TEMP
#define DO_KEEP_TEMP 0

static Image::Sampled *in_ps_reader_low(Image::Loader::UFD* ufd, char const*bboxline, SimBuffer::Flat const& hints) {
 SimBuffer::B mainfn;
 if (!Files::find_tmpnam(mainfn)) Error::sev(Error::EERROR) << "in_ps_reader" << ": tmpnam() failed" << (Error*)0;
 mainfn.term0();
 #if DO_KEEP_TEMP
   printf("m: %s\n", mainfn());
 #else
   Files::tmpRemoveCleanup(mainfn());
 #endif
 FILE *f=fopen(mainfn(),"w");
 fprintf(f, "%s", bboxline);
 /* vvv Dat: ignore extra calls to `showpage' */
 fprintf(f, "/showpage [ currentdict  /showpage  {}  /put load  /showpage load ] cvx def\n");
 fprintf(f, "_IFN (r) file cvx exec\nshowpage\n"); /* Dat: doesn't rely on GS to
   recognise EPSF-x.y comment, so works with both old and new gs */
 // ^^^ !! DOS EPSF etc. instead of exec/run
 fclose(f);
 // Error::sev(Error::EERROR) << "Cannot load PS images yet." << (Error*)0;
 /* Dat: -dLastPage=1 has no effect, but we keep it for PDF compatibility */
 /* !! keep only 1st page, without setpagedevice for PS files */
 /* Dat: -dSAFER won't let me open the file with `/' under ESP Ghostscript 7.05.6 (2003-02-05) */
 /* Imp: win9X command line too long? */
 SimBuffer::B cmd;
 add_gs_cmd(cmd,hints);
 cmd << " -s_IFN=%S -- %*";
 /*fprintf(stderr,"cmd:%s\n",cmd.term0()()); */
 HelperE helper(cmd.term0()(), mainfn()); /* Run external process GS */
 Filter::UngetFILED* ufdd=(Filter::UngetFILED*)ufd;
 int i=ufdd->vi_getcc();
 if (i<0) Error::sev(Error::EERROR) << "in_ps_reader: Empty PostScript file." << (Error*)0; /* should never happen */
 ((Filter::PipeE*)&helper)->vi_putcc(i);
 Encoder::writeFrom(*(Filter::PipeE*)&helper, *ufdd);
 ((Filter::PipeE*)&helper)->vi_write(0,0); /* Signal EOF */
 #if !DO_KEEP_TEMP
   remove(mainfn());
 #endif
 return helper.getImg();
}

static Image::Sampled *in_ps_reader(Image::Loader::UFD* ufd, SimBuffer::Flat const& hints) {
 /* Use the paper size (<</PageSize[...]>> setpagedevice; a4; letter etc.)
  * set up by the PostScript file, or the system default paper size.
  */
 return in_ps_reader_low(ufd, "", hints);
}

static Image::Sampled *in_eps_reader(Image::Loader::UFD* ufd, SimBuffer::Flat const& hints) {
 /* Use the *BoundingBox if available, else use the paper size set up by
  * the EPS file, or the system default paper size.
  */
 double llx=0.0, lly=0.0, urx=0.0, ury=0.0;
 Filter::UngetFILED* ufdd=(Filter::UngetFILED*)ufd;
 /* ^^^ SUXX: no warning for ufdd=ufdd */
 /* SUXX: valgrind, checkergcc: no indication of segfault due to stack overflow inside fgetc() */
 SimBuffer::B line; /* Imp: limit for max line length etc. */
 #if 0
 while ((line.clearFree(), ufdd->appendLine(line), line)) {
   line.term0();
   printf("line: %s", line());
 }
 #endif
 slen_t line0ofs;
 int had=0;
 while ((line0ofs=line.getLength(), ufdd->appendLine(line), line0ofs!=line.getLength())) {
   char const *thisline=line()+line0ofs;
   line.term0();
   // printf("line: %s", thisline);
   if (thisline[0]=='\n' || thisline[0]=='\r') continue; /* empty line */
   if (thisline[0]=='%' && thisline[1]=='!') continue; /* %!PS-... */
   if (thisline[0]!='%' || thisline[1]!='%') break; /* non-ADSC comment */
        if (had<3 && 4==sscanf(thisline+2, "ExactBoundingBox:%lg%lg%lg%lg", &llx, &lly, &urx, &ury)) had=3;
   else if (had<2 && 4==sscanf(thisline+2, "HiResBoundingBox:%lg%lg%lg%lg", &llx, &lly, &urx, &ury)) had=2;
   else if (had<1 && 4==sscanf(thisline+2, "BoundingBox:%lg%lg%lg%lg", &llx, &lly, &urx, &ury)) had=1;
   /* Dat: finds MetaPost hiresbbox after %%EndComments */
   // printf("line: %s", line()+line0ofs);
 }
 ufdd->unread(line(), line.getLength()); line.clearFree();
 char bboxline[400];
 if (had!=0) {
   // fprintf(stderr, "bbox=[%"PTS_CFG_PRINTFGLEN"g %"PTS_CFG_PRINTFGLEN"g %"PTS_CFG_PRINTFGLEN"g %"PTS_CFG_PRINTFGLEN"g]\n", llx, lly, urx, ury);
   /* Dat: we must call translate _after_ setpagedevice (so it will take effect), at least with ESP Ghostscript 7.05.6 (2003-02-05); BUGFIX at Fri Aug 12 22:49:07 CEST 2005 */
   sprintf(bboxline,
     "<</PageSize[%" PTS_CFG_PRINTFGLEN "g %" PTS_CFG_PRINTFGLEN "g]>>setpagedevice\n"
     /* removing /PageSize also cancels /a4, /a5 etc. */
     /* we need `currentmatrix ... setpagedevice setmatrix' because
      * setpagedevice cancels the current transformation matrix so our
      * `translate' below would be canceled if the EPS file contains
      * `a5', `setpagedevice' etc.
      */
     "/setpagedevice{matrix currentmatrix exch "
     "dup length dict copy dup /PageSize undef setpagedevice "
     "setmatrix}bind def\n"
     "%" PTS_CFG_PRINTFGLEN "g %" PTS_CFG_PRINTFGLEN "g translate\n"
     , urx-llx, ury-lly, -llx, -lly);
 } else {
   Error::sev(Error::WARNING) << "in_eps_reader: missing EPS bbox" << (Error*)0;
   bboxline[0]='\0';
 }

 return in_ps_reader_low(ufd, bboxline, hints);
}

static Image::Loader::reader_t in_ps_checker(char buf[Image::Loader::MAGIC_LEN], char [Image::Loader::MAGIC_LEN], SimBuffer::Flat const&, Image::Loader::UFD*) {
 if (0!=memcmp(buf,"%!PS-Adobe-",11)) return 0;
 char const *p=buf+11, *pend=buf+Image::Loader::MAGIC_LEN;
 while (p!=pend && *p!=' ' && *p!='\t') p++;
 while (p!=pend && (*p==' ' || *p=='\t')) p++;
 /* Imp: option to accept BoundingBox for non-EPS PS */
 return (0==strncmp(p,"EPSF-",5)) ? in_eps_reader : in_ps_reader;
 /* ^^^ BUGFIX at Fri Nov 26 12:13:58 CET 2004 */
 /* ^^^ BUGFIX again at Thu Jan  6 10:25:54 CET 2005 */
}

#else
#define in_ps_checker (Image::Loader::checker_t)NULLP
#endif /* USE_IN_PS */

Image::Loader in_ps_loader = { "PS", in_ps_checker, 0 };

#if USE_IN_PDF

static Image::Sampled *in_pdf_reader(Image::Loader::UFD* ufd, SimBuffer::Flat const& hints) {
 // Error::sev(Error::EERROR) << "Cannot load PDF images yet." << (Error*)0;
 SimBuffer::B cmd;
 add_gs_cmd(cmd,hints);
 cmd << " -- %S";
 /* Dat: -dSAFER won't let me open the file with `/' under ESP Ghostscript 7.05.6 (2003-02-05) */
 /* Imp: win9X command line too long? */
 fprintf(stderr, "gs_cmd=(%s)\n", cmd.term0()());
 HelperE helper(cmd.term0()()); /* Run external process GS */
 Encoder::writeFrom(*(Filter::PipeE*)&helper, *(Filter::UngetFILED*)ufd);
 ((Filter::PipeE*)&helper)->vi_write(0,0); /* Signal EOF */
 return helper.getImg();
}

static Image::Loader::reader_t in_pdf_checker(char buf[Image::Loader::MAGIC_LEN], char [Image::Loader::MAGIC_LEN], SimBuffer::Flat const&, Image::Loader::UFD*) {
 return 0==memcmp(buf,"%PDF-",5) ? in_pdf_reader : 0;
}

#else
#define in_pdf_checker (Image::Loader::checker_t)NULLP
#endif /* USE_IN_PDF */

Image::Loader in_pdf_loader = { "PDF", in_pdf_checker, 0 };

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