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/*
** wgs.c Stubs for calls to Ghostscript DLL
**
** Part of willus.com general purpose C code library.
**
** Copyright (C) 2018 http://willus.com
**
** This program is free software: you can redistribute it and/or modify
** it under the terms of the GNU Affero General Public License as
** published by the Free Software Foundation, either version 3 of the
** License, or (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU Affero General Public License for more details.
**
** You should have received a copy of the GNU Affero General Public License
** along with this program. If not, see <http://www.gnu.org/licenses/>.
**
*/
/*
** 1. If Linux, look in path, look in exe dir if possible, look in current dir,
** look in opt/gs*, WILLUSGS_PATH envvar.
**
** 2. If Windows, look in path, cur dir, exe dir, x:\program files\gs*,
** x:\program files (x86)\gs*, x:\gs\*, WILLUSGS_PATH env var.
**
*/
#include "willus.h"
#if (defined(WIN32) || defined(WIN64))
#include <windows.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_GHOSTSCRIPT
/*
** DLL handle
*/
#if (defined(WIN32) || defined(WIN64))
static HINSTANCE willusgs_lib = NULL;
#endif
static int willusgs_inited=0;
static char willusgs_name[512];
static int willusgs_isdll=0;
static int willusgs_device_width_pts=-1;
static int willusgs_device_height_pts=-1;
/*
** Pointers which will get pointed to the DLL functions
*/
#if (defined(WIN32) || defined(WIN64))
typedef int (__stdcall *apifunc1)(void *,void *);
typedef int (__stdcall *apifunc2)(void *,int,char *[]);
typedef int (__stdcall *apifunc3)(void *);
typedef int (*stdfunc)(void *caller_handle,const char *buf,int len);
typedef int (__stdcall *apifunc4)(void *instance,stdfunc stdin_fn,
stdfunc stdout_fn,stdfunc stderr_fn);
apifunc1 gsapi_new_instance;
apifunc2 gsapi_init_with_args;
apifunc3 gsapi_exit;
apifunc3 gsapi_delete_instance;
apifunc4 gsapi_set_stdio;
/*
static int (__stdcall *gsapi_set_stdio)(void *instance, int(*stdin_fn)(void *caller_handle, char *buf, int len), int(*stdout_fn)(void *caller_handle, const char *str, int len), int(*stderr_fn)(void *caller_handle, const char *str, int len));
*/
static int gsdll_stdio(void *instance,const char *str,int len);
#endif
/*
** Sample use
**
int main(int argc,char *argv[])
{
WILLUSBITMAP *bmp,_bmp;
bmp=&_bmp;
bmp_init(bmp);
willusgs_read_pdf_or_ps_to_png(bmp,"myfile.pdf",1,200,stdout);
...
bmp_free(bmp);
willusgs_close();
}
*/
/* Use -1 to ignore or use default */
void willusgs_set_device_width_and_height_pts(int w,int h)
{
willusgs_device_width_pts=w;
willusgs_device_height_pts=h;
}
#define NARGSMAX 18
int willusgs_read_pdf_or_ps_bmp(WILLUSBITMAP *bmp,char *filename,int pageno,double dpi,FILE *out)
{
char argdata[NARGSMAX][48];
char *argv[NARGSMAX];
int i,status;
char tempfile[256];
char argtemp[280];
char srcfile[256];
willusgs_init(out);
wfile_abstmpnam(tempfile);
for (i=0;i<NARGSMAX;i++)
argv[i]=&argdata[i][0];
i=0;
strcpy(argv[i++],"-q");
strcpy(argv[i++],"-P-");
strcpy(argv[i++],"-dSAFER");
strcpy(argv[i++],"-dBATCH");
strcpy(argv[i++],"-dNOPAUSE");
strcpy(argv[i++],"-sDEVICE=png16m");
/*
printf("Setting dev to %d x %d pts (%g dpi)\n",willusgs_device_width_pts,willusgs_device_height_pts,dpi);
printf("==> bitmap should be %d x %d\n",(int)(willusgs_device_width_pts*dpi/72.+.5),
(int)(willusgs_device_height_pts*dpi/72.+.5));
*/
if (willusgs_device_width_pts>0)
sprintf(argv[i++],"-dDEVICEWIDTHPOINTS=%d",willusgs_device_width_pts);
if (willusgs_device_height_pts>0)
sprintf(argv[i++],"-dDEVICEHEIGHTPOINTS=%d",willusgs_device_height_pts);
strcpy(argv[i++],"-dGraphicsAlphaBits=4");
strcpy(argv[i++],"-dTextAlphaBits=4");
sprintf(argv[i++],"-r%g",dpi);
sprintf(argv[i++],"-dFirstPage=%d",pageno<=0?1:pageno);
sprintf(argv[i++],"-dLastPage=%d",pageno<=0?1:pageno);
argv[i++]=&argtemp[0];
sprintf(argtemp,"-sOutputFile=%s",tempfile);
argv[i++]=&srcfile[0];
strcpy(srcfile,filename);
status=willusgs_exec(i,argv,out);
if (status<0)
return(status);
status=bmp_read_png(bmp,tempfile,out);
if (status<0)
{
nprintf(out,"BMP read failed. GS output in file %s (not deleted).\n",tempfile);
return(status-100);
}
/*
printf("bitmap is %d x %d x %d\n",bmp->width,bmp->height,bmp->bpp);
*/
remove(tempfile);
return(0);
}
/*
** Source file can be PS or PDF
** Google "ps2pdf options" to see more about these options.
** 3-6-16: Removed page numbers--they don't work. Converts the whole document.
*/
int willusgs_ps_to_pdf(char *dstfile,char *srcfile,FILE *out)
{
char argdata[16][32];
char *argv[16];
int i,status;
char argtemp[280];
char argsrc[280];
willusgs_init(out);
for (i=0;i<16;i++)
argv[i]=&argdata[i][0];
i=0;
/* -dSAFER reduces security risk from malicious PS/PDF files */
strcpy(argv[i++],"-q");
strcpy(argv[i++],"-P-");
strcpy(argv[i++],"-dSAFER");
strcpy(argv[i++],"-dBATCH");
strcpy(argv[i++],"-dNOPAUSE");
strcpy(argv[i++],"-sDEVICE=pdfwrite");
if (willusgs_device_width_pts>0)
sprintf(argv[i++],"-dDEVICEWIDTHPOINTS=%d",willusgs_device_width_pts);
if (willusgs_device_height_pts>0)
sprintf(argv[i++],"-dDEVICEHEIGHTPOINTS=%d",willusgs_device_height_pts);
strcpy(argv[i++],"-dPDFSETTINGS=/prepress");
/*
if (firstpage>0)
sprintf(argv[i++],"-dFirstPage=%d",firstpage);
if (lastpage>0)
sprintf(argv[i++],"-dLastPage=%d",lastpage);
*/
argv[i++]=&argtemp[0];
sprintf(argtemp,"-sOutputFile=%s",dstfile);
/* CompatibilityLevel=1.4 is the default--google ps2pdf options */
/*
strcpy(argv[i++],"-dCompatibilityLevel=1.4");
strcpy(argv[i++],"-c");
strcpy(argv[i++],".setpdfwrite");
*/
argv[i++]=&argsrc[0];
sprintf(argsrc,"%s",srcfile);
status=willusgs_exec(i,argv,out);
return(status);
}
int willusgs_init(FILE *out)
{
int i,status;
#if (defined(WIN32) || defined(WIN64))
#if (defined(WIN64))
static char *gsnames[]={"gsdll64.dll","gswin64c.exe","gsdll32.dll","gswin32c.exe",""};
#else
static char *gsnames[]={"gsdll32.dll","gswin32c.exe",""};
#endif
static char *folders[]={"+\\Program Files\\gs","+\\Program Files (x86)\\gs",
"+\\Program Files\\ghostgum","+\\Program Files (x86)\\ghostgum",
"\\Program Files\\gs*","\\Program Files (x86)\\gs*",
"\\Program Files\\ghostgum*","\\Program Files (x86)\\ghostgum*",
"+\\gs","+\\ghostgum","\\gs*","\\ghostgum*",""};
#else
static char *gsnames[]={"gs",""};
static char *folders[]={"/usr/bin","/usr/share/gs","/usr/local/gs","/opt/gs",
"/usr/share/gs*","/usr/local/gs*","/opt/gs*",""};
#endif
if (willusgs_inited)
return(0);
willusgs_name[0]='\0';
willusgs_isdll=0;
/*
** Look in registry first
*/
#if (defined(WIN32) || defined(WIN64))
if (!win_registry_search(willusgs_name,511,"GS_DLL","software\\gpl ghostscript",1))
{
if (LoadLibrary(willusgs_name)!=NULL)
FreeLibrary((HMODULE)willusgs_name);
else
{
char basepath[511];
wfile_basepath(basepath,willusgs_name);
#if (defined(WIN64))
wfile_fullname(willusgs_name,basepath,"gswin64c.exe");
if (wfile_status(willusgs_name)!=1)
{
#endif
wfile_fullname(willusgs_name,basepath,"gswin32c.exe");
if (wfile_status(willusgs_name)!=1)
willusgs_name[0]='\0';
#if (defined(WIN64))
}
#endif
}
}
#endif
/*
** Search WILLUSGS_PATH and/or common folders
*/
if (willusgs_name[0]=='\0')
{
for (i=0;gsnames[i][0]!='\0';i++)
{
status=wfile_find_file(willusgs_name,gsnames[i],folders,"cde",1,1,1,"WILLUSGS_PATH");
if (!status)
{
break;
}
}
if (gsnames[i][0]=='\0')
willusgs_name[0]='\0';
}
/*
** Still not found??
*/
if (willusgs_name[0]=='\0' || wfile_status(willusgs_name)!=1)
{
nprintf(out,"\n\aCan't find ghostscript command file: ");
for (i=0;gsnames[i][0]!='\0';i++)
nprintf(out,"%s%s",i>0?" or ":" ",gsnames[i]);
nprintf(out,"\n\nIf you have not installed Ghostscript, please install it.\n"
"(Google it to find the install package.)\n"
"Otherwise, set the environment variable WILLUSGS_PATH to point to\n"
"the folder where the ghostscript command file is located.\n");
return(-1);
}
else
nprintf(out,"Ghostscript found: '%s'\n",willusgs_name);
#if (defined(WIN32) || defined(WIN64))
willusgs_isdll = (!stricmp(wfile_ext(willusgs_name),"dll"));
if (willusgs_isdll)
{
willusgs_lib=LoadLibrary(willusgs_name);
if (willusgs_lib==NULL)
{
nprintf(out,"Internal error! DLL load failed for %s!\n",willusgs_name);
nprintf(out,"%s\n",win_lasterror());
return(-2);
}
if ( (gsapi_new_instance = (apifunc1)GetProcAddress(willusgs_lib, (LPCSTR)"gsapi_new_instance"))==NULL
|| (gsapi_init_with_args = (apifunc2)GetProcAddress(willusgs_lib, (LPCSTR)"gsapi_init_with_args"))==NULL
|| (gsapi_exit = (apifunc3)GetProcAddress(willusgs_lib, (LPCSTR)"gsapi_exit"))==NULL
|| (gsapi_delete_instance = (apifunc3)GetProcAddress(willusgs_lib, (LPCSTR)"gsapi_delete_instance"))==NULL
|| (gsapi_set_stdio = (apifunc4)GetProcAddress(willusgs_lib, (LPCSTR)"gsapi_set_stdio"))==NULL)
{
willusgs_close();
nprintf(out,"Can't find entry points in gsdll32.dll.\n");
return(-3);
}
}
#endif
willusgs_inited=1;
willusgs_device_width_pts=willusgs_device_height_pts=-1;
return(0);
}
int willusgs_exec(int argc,char *argv[],FILE *out)
{
int i;
char cmd[1024];
/*
{
int i;
printf("willusgs_exec:\n");
for (i=0;i<argc;i++)
printf(" argv[%d]='%s'\n",i,argv[i]);
}
*/
willusgs_init(out);
#if (defined(WIN32) || defined(WIN64))
if (willusgs_isdll)
{
int status,status1;
void *gsinst;
status=(*gsapi_new_instance)(&gsinst,NULL);
if (status<0)
{
nprintf(out,"Cannot create GS instance!\n");
return(-1);
}
/* Don't echo chars to screen */
gsapi_set_stdio(gsinst,NULL,gsdll_stdio,gsdll_stdio);
/*
printf("Calling dll...\n");
for (i=0;i<argc;i++)
printf(" argv[%d]='%s'\n",i,argv[i]);
*/
status=(*gsapi_init_with_args)(gsinst,argc,argv);
status1=(*gsapi_exit)(gsinst);
if (status==0 || status==-101)
status=status1;
(*gsapi_delete_instance)(gsinst);
if (status==0 || status==-101)
return(0);
return(-2);
}
strcpy(cmd,"\"");
#else
cmd[0]='\0';
#endif
sprintf(&cmd[strlen(cmd)],"\"%s\"",willusgs_name);
for (i=1;i<argc;i++)
sprintf(&cmd[strlen(cmd)]," \"%s\"",argv[i]);
#if (defined(WIN32) || defined(WIN64))
strcat(cmd," 1> nul 2> nul\"");
#else
strcat(cmd," 1> /dev/null 2>&1");
#endif
/*
printf("cmd='%s'\n",cmd);
*/
system(cmd);
return(0);
}
#if (defined(WIN32) || defined(WIN64))
static int gsdll_stdio(void *instance,const char *str,int len)
{
return(len);
}
#endif
void willusgs_close(void)
{
#if (defined(WIN32) || defined(WIN64))
if (willusgs_isdll && willusgs_lib!=NULL)
FreeLibrary(willusgs_lib);
willusgs_lib = NULL;
#endif
willusgs_inited = 0;
}
#endif /* HAVE_GHOSTSCRIPT */
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