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/*************************************************************************
** Ghostscript.cpp **
** **
** This file is part of dvisvgm -- the DVI to SVG converter **
** Copyright (C) 2005-2010 Martin Gieseking <martin.gieseking@uos.de> **
** **
** This program is free software; you can redistribute it and/or **
** modify it under the terms of the GNU 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 General Public License for more details. **
** **
** You should have received a copy of the GNU General Public License **
** along with this program; if not, see <http://www.gnu.org/licenses/>. **
*************************************************************************/
#include "Ghostscript.h"
#if !defined(DISABLE_GS)
#include <cstring>
#include <sstream>
using namespace std;
#ifdef __WIN32__
#define GS_DL_NAME "gsdll32.dll"
#else
#define GS_DL_NAME "libgs.so"
#endif
string Ghostscript::LIBGS_NAME;
/** Loads the Ghostscript library but does not create an instance. This
* constructor should only be used to call available() and revision(). */
Ghostscript::Ghostscript ()
#if !defined(HAVE_LIBGS)
: DLLoader(LIBGS_NAME.empty() ? GS_DL_NAME : LIBGS_NAME.c_str())
#endif
{
_inst = 0;
}
/** Tries to load the shared library and to initialize Ghostscript.
* @param[in] argc number of parameters in array argv
* @param[in] argv parameters passed to Ghostscript
* @param[in] caller this parameter is passed to all callback functions */
Ghostscript::Ghostscript (int argc, const char **argv, void *caller)
#if !defined(HAVE_LIBGS)
: DLLoader(LIBGS_NAME.empty() ? GS_DL_NAME : LIBGS_NAME.c_str())
#endif
{
int status = new_instance(&_inst, caller);
if (status < 0)
_inst = 0;
else {
init_with_args(argc, (char**)argv);
}
}
/** Exits Ghostscript and unloads the dynamic library. */
Ghostscript::~Ghostscript () {
if (_inst) {
exit();
delete_instance();
}
}
/** Returns true if Ghostscript library was found and can be loaded. */
bool Ghostscript::available () {
#if defined(HAVE_LIBGS)
return true;
#else
return loaded();
#endif
}
/** Retrieves version information about Ghostscript.
* @param[out] r takes the revision information (see GS API documentation for further details)
* @return true on success */
bool Ghostscript::revision (gsapi_revision_t *r) {
#if defined(HAVE_LIBGS)
return (gsapi_revision(r, sizeof(gsapi_revision_t)) == 0);
#else
if (PFN_gsapi_revision fn = (PFN_gsapi_revision)loadFunction("gsapi_revision"))
return (fn(r, sizeof(gsapi_revision_t)) == 0);
return false;
#endif
}
string Ghostscript::revision () {
gsapi_revision_t r;
if (revision(&r)) {
ostringstream oss;
oss << r.product << ' ' << (r.revision/100) << '.' << (r.revision%100);
return oss.str();
}
return "";
}
/** Creates a new instance of Ghostscript. This method is called by the constructor and
* should not be used elsewhere.
* @param[out] psinst handle of newly created instance (or 0 on error)
* @param[in] caller pointer forwarded to callback functions */
int Ghostscript::new_instance (void **psinst, void *caller) {
#if defined(HAVE_LIBGS)
return gsapi_new_instance(psinst, caller);
#else
if (PFN_gsapi_new_instance fn = (PFN_gsapi_new_instance)loadFunction("gsapi_new_instance"))
return fn(psinst, caller);
*psinst = 0;
return 0;
#endif
}
/** Destroys the current instance of Ghostscript. This method is called by the destructor
* and should not be used elsewhere. */
void Ghostscript::delete_instance () {
#if defined(HAVE_LIBGS)
gsapi_delete_instance(_inst);
#else
if (PFN_gsapi_delete_instance fn = (PFN_gsapi_delete_instance)loadFunction("gsapi_delete_instance"))
fn(_inst);
#endif
}
/** Exits the interpreter. Must be called before destroying the GS instance. */
int Ghostscript::exit () {
#if defined(HAVE_LIBGS)
return gsapi_exit(_inst);
#else
if (PFN_gsapi_exit fn = (PFN_gsapi_exit)loadFunction("gsapi_exit"))
return fn(_inst);
return 0;
#endif
}
/** Sets the I/O callback functions.
* @param[in] in pointer to stdin handler
* @param[in] out pointer to stdout handler
* @param[in] err pointer to stderr handler */
int Ghostscript::set_stdio (Stdin in, Stdout out, Stderr err) {
#if defined(HAVE_LIBGS)
return gsapi_set_stdio(_inst, in, out, err);
#else
if (PFN_gsapi_set_stdio fn = (PFN_gsapi_set_stdio)loadFunction("gsapi_set_stdio"))
return fn(_inst, in, out, err);
return 0;
#endif
}
/** Initializes Ghostscript with a set of optional parameters. This
* method is called by the constructor and should not be used elsewhere.
* @param[in] argc number of paramters
* @param[in] argv parameters passed to Ghostscript */
int Ghostscript::init_with_args (int argc, char **argv) {
#if defined(HAVE_LIBGS)
return gsapi_init_with_args(_inst, argc, argv);
#else
if (PFN_gsapi_init_with_args fn = (PFN_gsapi_init_with_args)loadFunction("gsapi_init_with_args"))
return fn(_inst, argc, argv);
return 0;
#endif
}
/** Tells Ghostscript that several calls of run_string_continue will follow. */
int Ghostscript::run_string_begin (int user_errors, int *pexit_code) {
#if defined(HAVE_LIBGS)
return gsapi_run_string_begin(_inst, user_errors, pexit_code);
#else
if (PFN_gsapi_run_string_begin fn = (PFN_gsapi_run_string_begin)loadFunction("gsapi_run_string_begin"))
return fn(_inst, user_errors, pexit_code);
*pexit_code = 0;
return 0;
#endif
}
/** Executes a chunk of PostScript commands given by a buffer of characters. The size of
* this buffer must not exceed 64KB. Longer programs can be split into arbitrary smaller chunks
* and passed to Ghostscript by successive calls of run_string_continue.
* @param[in] str buffer containing the PostScript code
* @param[in] length number of characters in buffer
* @param[in] user_errors if non-negative, the default PS error values will be generated, otherwise this value is returned
* @param[out] pexit_code takes the PS error code */
int Ghostscript::run_string_continue (const char *str, unsigned length, int user_errors, int *pexit_code) {
#if defined(HAVE_LIBGS)
return gsapi_run_string_continue(_inst, str, length, user_errors, pexit_code);
#else
if (PFN_gsapi_run_string_continue fn = (PFN_gsapi_run_string_continue)loadFunction("gsapi_run_string_continue"))
return fn(_inst, str, length, user_errors, pexit_code);
*pexit_code = 0;
return 0;
#endif
}
/** Terminates the successive code feeding. Must be called after the last call of run_string_continue. */
int Ghostscript::run_string_end (int user_errors, int *pexit_code) {
#if defined(HAVE_LIBGS)
return gsapi_run_string_end(_inst, user_errors, pexit_code);
#else
if (PFN_gsapi_run_string_end fn = (PFN_gsapi_run_string_end)loadFunction("gsapi_run_string_end"))
return fn(_inst, user_errors, pexit_code);
*pexit_code = 0;
return 0;
#endif
}
#endif // !DISABLE_GS
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