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/* Copyright (C) 1996, Russell Lang. All rights reserved.
This file is part of Aladdin Ghostscript.
Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND. No author
or distributor accepts any responsibility for the consequences of using it,
or for whether it serves any particular purpose or works at all, unless he
or she says so in writing. Refer to the Aladdin Ghostscript Free Public
License (the "License") for full details.
Every copy of Aladdin Ghostscript must include a copy of the License,
normally in a plain ASCII text file named PUBLIC. The License grants you
the right to copy, modify and redistribute Aladdin Ghostscript, but only
under certain conditions described in the License. Among other things, the
License requires that the copyright notice and this notice be preserved on
all copies.
*/
// gsdll class for MS-Windows
// Alternate implementation which doesn't use a DLL at all.
// Instead Ghostscript is statically linked in to the EXE
// and this code makes dw*.c think that it really does have
// the GS DLL loaded.
#define STRICT
#include <windows.h>
#include <string.h>
#include <stdio.h>
extern "C" {
#include "gsdll.h"
}
#include "dwdll.h" // gsdll_class
static char not_loaded[] = "DLL is not loaded";
static char func_null[] = "A function pointer to the DLL is NULL";
static char not_init[] = "Not initialized";
int
gsdll_class::load(const HINSTANCE in_hinstance,
const char *name, const long need_version)
{
// Don't load if already loaded
if (hmodule)
return 0;
hinstance = in_hinstance;
initialized = FALSE;
// Act like we have loaded the DLL
// Use the caller instance so that resources are loaded correctly
hmodule = hinstance;
// Need to cause the same thing to happen in gp_mswin.c
// Get pointers to functions
// Under Win32, nothing special is needed.
// Under Win16, the functions are _export and hence need a
// thunk created by MakeProcInstance
#ifdef __WIN32__
c_revision = gsdll_revision;
c_init = gsdll_init;
c_execute_begin = gsdll_execute_begin;
c_execute_cont = gsdll_execute_cont;
c_execute_end = gsdll_execute_end;
c_exit = gsdll_exit;
c_lock_device = gsdll_lock_device;
c_copy_dib = gsdll_copy_dib;
c_copy_palette = gsdll_copy_palette;
c_draw = gsdll_draw;
#else
c_revision = (PFN_gsdll_revision) MakeProcInstance(gsdll_revision, hmodule);
if (c_revision == NULL) {
sprintf(last_error, "Can't make prolog for gsdll_revision\n");
unload();
return 1;
}
// check DLL version
c_revision(NULL, NULL, &version, NULL);
if (version != need_version) {
sprintf(last_error, "Wrong version of DLL found.\n Found version %ld\n Need version %ld\n", version, need_version);
unload();
return 1;
}
// continue loading other functions */
c_init = (PFN_gsdll_init) MakeProcInstance(gsdll_init, hmodule);
if (c_init == NULL) {
sprintf(last_error, "Can't make prolog for gsdll_init\n");
unload();
return 1;
}
c_execute_begin = (PFN_gsdll_execute_begin) MakeProcInstance(gsdll_execute_begin, hmodule);
if (c_execute_begin == NULL) {
sprintf(last_error, "Can't make prolog for gsdll_execute_begin\n");
unload();
return 1;
}
c_execute_cont = (PFN_gsdll_execute_cont) MakeProcInstance(gsdll_execute_cont, hmodule);
if (c_execute_cont == NULL) {
sprintf(last_error, "Can't make prolog for gsdll_execute_cont\n");
unload();
return 1;
}
c_execute_end = (PFN_gsdll_execute_end) MakeProcInstance(gsdll_execute_end, hmodule);
if (c_execute_end == NULL) {
sprintf(last_error, "Can't make prolog for gsdll_execute_end\n");
unload();
return 1;
}
c_exit = (PFN_gsdll_exit) MakeProcInstance(gsdll_exit, hmodule);
if (c_exit == NULL) {
sprintf(last_error, "Can't make prolog for gsdll_exit\n");
unload();
return 1;
}
c_lock_device = (PFN_gsdll_lock_device) MakeProcInstance(gsdll_lock_device, hmodule);
if (c_lock_device == NULL) {
sprintf(last_error, "Can't make prolog for gsdll_lock_device\n");
unload();
return 1;
}
c_copy_dib = (PFN_gsdll_copy_dib) MakeProcInstance(gsdll_copy_dib, hmodule);
if (c_copy_dib == NULL) {
sprintf(last_error, "Can't make prolog for gsdll_copy_dib\n");
unload();
return 1;
}
c_copy_palette = (PFN_gsdll_copy_palette) MakeProcInstance(gsdll_copy_palette, hmodule);
if (c_copy_palette == NULL) {
sprintf(last_error, "Can't make prolog for gsdll_copy_palette\n");
unload();
return 1;
}
c_draw = (PFN_gsdll_draw) MakeProcInstance(gsdll_draw, hmodule);
if (c_draw == NULL) {
sprintf(last_error, "Can't make prolog for gsdll_draw\n");
unload();
return 1;
}
#endif
return 0;
}
int
gsdll_class::unload(void)
{
// exit Ghostscript interpreter
if (initialized) {
if (!execute_code)
c_execute_end();
c_exit();
#ifndef __WIN32__
FreeProcInstance((FARPROC)callback);
#endif
callback = NULL;
}
// For Win16, must free the thunks.
#ifndef __WIN32__
// is it safe to call these with NULL pointers?
FreeProcInstance(c_revision);
FreeProcInstance(c_init);
FreeProcInstance(c_execute_begin);
FreeProcInstance(c_execute_cont);
FreeProcInstance(c_execute_end);
FreeProcInstance(c_exit);
FreeProcInstance(c_lock_device);
FreeProcInstance(c_copy_dib);
FreeProcInstance(c_copy_palette);
FreeProcInstance(c_draw);
#endif
// Set functions to NULL to prevent use
c_revision = NULL;
c_init = NULL;
c_execute_begin = NULL;
c_execute_cont = NULL;
c_execute_end = NULL;
c_exit = NULL;
c_lock_device = NULL;
c_copy_dib = NULL;
c_copy_palette = NULL;
c_draw = NULL;
// need to do more than this
device = NULL;
// Don't do anything else if already unloaded
if (hmodule == (HINSTANCE)NULL)
return 0;
return 0;
}
int
gsdll_class::revision(char FAR * FAR *product, char FAR * FAR *copyright,
long FAR *revision, long FAR *revisiondate)
{
if (!hmodule) {
strcpy(last_error, not_loaded);
return 1;
}
if (!c_revision)
return c_revision(product, copyright, revision, revisiondate);
strcpy(last_error, func_null);
return 1;
}
int
gsdll_class::init(GSDLL_CALLBACK in_callback, HWND hwnd, int argc, char FAR * FAR *argv)
{
int rc;
execute_code = 0;
if (!hmodule) {
strcpy(last_error, not_loaded);
return 1;
}
if (initialized) {
strcpy(last_error, "Already initialized");
return 1;
}
if (in_callback == (GSDLL_CALLBACK)NULL) {
strcpy(last_error, "Callback not provided");
return 1;
}
#ifdef __WIN32__
callback = in_callback;
#else
callback = (GSDLL_CALLBACK)MakeProcInstance((FARPROC)in_callback, hinstance);
#endif
if (c_init && c_execute_begin) {
rc = c_init(callback, hwnd, argc, argv);
if (rc) {
sprintf(last_error, "gsdll_init returns %d\nDLL already in use", rc);
return rc;
}
else {
if ((rc = c_execute_begin()) != 0)
sprintf(last_error, "gsdll_execute_begin returns %d", rc);
else
initialized = TRUE;
return rc;
}
}
strcpy(last_error, func_null);
return 1;
}
int
gsdll_class::restart(int argc, char FAR * FAR *argv)
{
if (!hmodule) {
strcpy(last_error, not_loaded);
return 1;
}
if (!initialized) {
strcpy(last_error, not_init);
return 1;
}
if (c_execute_end && c_exit) {
if (!execute_code)
c_execute_end();
c_exit();
#ifndef __WIN32__
FreeProcInstance((FARPROC)callback);
#endif
// ignore return codes since they we may be aborting from an error
initialized = FALSE;
return init(callback, hwnd, argc, argv);
}
strcpy(last_error, func_null);
return 1;
}
int
gsdll_class::get_last_error(char *str, int len)
{
strncpy(str, last_error,
(len < sizeof(last_error) ? len : sizeof(last_error)));
return 0;
}
int
gsdll_class::execute(const char FAR *str, int len)
{
if (!hmodule) {
strcpy(last_error, not_loaded);
return 1;
}
if (!initialized) {
strcpy(last_error, not_init);
return 1;
}
if (c_execute_cont) {
execute_code = c_execute_cont(str, len);
return execute_code;
}
strcpy(last_error, func_null);
return 1;
}
int
gsdll_class::draw(const char FAR *device, HDC hdc, int dx, int dy, int wx, int wy, int sx, int sy)
{
RECT source, dest;
source.left = sx;
source.right = sx+wx;
source.top = sy;
source.bottom = sy+wy;
dest.left = dx;
dest.right = dx+wx;
dest.top = dy;
dest.bottom = dy+wy;
c_draw((unsigned char FAR *)device, hdc, &dest, &source);
return 0;
}
HPALETTE
gsdll_class::copy_palette(const char FAR *device)
{
return c_copy_palette((unsigned char FAR *)device);
}
HGLOBAL
gsdll_class::copy_dib(const char FAR *device)
{
return c_copy_dib((unsigned char FAR *)device);
}
int
gsdll_class::lock_device(const char FAR *device, int lock)
{
return c_lock_device((unsigned char FAR *)device, lock);
}
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