qpdf/include/qpdf/qpdfjob-c.h

/* Copyright (c) 2005-2023 Jay Berkenbilt
 *
 * This file is part of qpdf.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 *
 * Versions of qpdf prior to version 7 were released under the terms of version 2.0 of the Artistic
 * License. At your option, you may continue to consider qpdf to be licensed under those terms.
 * Please see the manual for additional information.
 */

#ifndef QPDFJOB_C_H
#define QPDFJOB_C_H

/*
 * This file defines a basic "C" API for QPDFJob. See also qpdf-c.h, which defines an API that
 * exposes more of the library's API. This API is primarily intended to make it simpler for programs
 * in languages other than C++ to incorporate functionality that could be run directly from the
 * command-line.
 */

#include <qpdf/DLL.h>
#include <qpdf/qpdf-c.h>
#include <qpdf/qpdflogger-c.h>
#include <string.h>
#ifndef QPDF_NO_WCHAR_T
# include <wchar.h>
#endif

/*
 * This file provides a minimal wrapper around QPDFJob. See examples/qpdfjob-c.c for an example of
 * its use.
 */

#ifdef __cplusplus
extern "C" {
#endif
    /* SHORT INTERFACE -- These functions are single calls that take care of the whole life cycle of
     * QPDFJob. They can be used for one-shot operations where no additional configuration is
     * needed. See FULL INTERFACE below. */

    /* This function does the equivalent of running the qpdf command-line with the given arguments
     * and returns the exit code that qpdf would use. argv must be a null-terminated array of
     * null-terminated UTF8-encoded strings. If calling this from wmain on Windows, use
     * qpdfjob_run_from_wide_argv instead. Exit code values are defined in Constants.h in the
     * qpdf_exit_code_e type.
     */
    QPDF_DLL
    int qpdfjob_run_from_argv(char const* const argv[]);

#ifndef QPDF_NO_WCHAR_T
    /* This function is the same as qpdfjob_run_from_argv except argv is encoded with wide
     * characters. This would be suitable for calling from a Windows wmain function.
     */
    QPDF_DLL
    int qpdfjob_run_from_wide_argv(wchar_t const* const argv[]);
#endif /* QPDF_NO_WCHAR_T */

    /* This function runs QPDFJob from a job JSON file. See the "QPDF Job" section of the manual for
     * details. The JSON string must be UTF8-encoded. It returns the error code that qpdf would
     * return with the equivalent command-line invocation. Exit code values are defined in
     * Constants.h in the qpdf_exit_code_e type.
     */
    QPDF_DLL
    int qpdfjob_run_from_json(char const* json);

    /* FULL INTERFACE -- new in qpdf11. Similar to the qpdf-c.h API, you must call qpdfjob_init to
     * get a qpdfjob_handle and, when done, call qpdfjob_cleanup to free resources. Remaining
     * methods take qpdfjob_handle as an argument. This interface requires more calls but also
     * offers greater flexibility.
     */
    typedef struct _qpdfjob_handle* qpdfjob_handle;
    QPDF_DLL
    qpdfjob_handle qpdfjob_init();

    QPDF_DLL
    void qpdfjob_cleanup(qpdfjob_handle* j);

    /* Set or get the current logger. You need to call qpdflogger_cleanup on the logger handles when
     * you are done with the handles. The underlying logger is cleaned up automatically and persists
     * if needed after the logger handle is destroyed. See comments in qpdflogger-c.h for details.
     */

    QPDF_DLL
    void qpdfjob_set_logger(qpdfjob_handle j, qpdflogger_handle logger);
    QPDF_DLL
    qpdflogger_handle qpdfjob_get_logger(qpdfjob_handle j);

    /* This function wraps QPDFJob::initializeFromArgv. The return value is the same as qpdfjob_run.
     * If this returns an error, it is invalid to call any other functions this job handle.
     */
    QPDF_DLL
    int qpdfjob_initialize_from_argv(qpdfjob_handle j, char const* const argv[]);

#ifndef QPDF_NO_WCHAR_T
    /* This function is the same as qpdfjob_initialize_from_argv except argv is encoded with wide
     * characters. This would be suitable for calling from a Windows wmain function.
     */
    QPDF_DLL
    int qpdfjob_initialize_from_wide_argv(qpdfjob_handle j, wchar_t const* const argv[]);
#endif /* QPDF_NO_WCHAR_T */

    /* This function wraps QPDFJob::initializeFromJson. The return value is the same as qpdfjob_run.
     * If this returns an error, it is invalid to call any other functions using this job handle.
     */
    QPDF_DLL
    int qpdfjob_initialize_from_json(qpdfjob_handle j, char const* json);

    /* This function wraps QPDFJob::run. It returns the error code that qpdf would return with the
     * equivalent command-line invocation. Exit code values are defined in Constants.h in the
     * qpdf_exit_code_e type.
     */
    QPDF_DLL
    int qpdfjob_run(qpdfjob_handle j);

    /* The following two functions allow a job to be run in two stages - creation of a qpdf_data
     * object and writing of the qpdf_data object. This allows the qpdf_data object to be modified
     * prior to writing it out. See examples/qpdfjob-remove-annotations for a C++ illustration of
     * its use.
     *
     * This function wraps QPDFJob::createQPDF. It runs the first stage of the job. A nullptr is
     * returned if the job did not produce any pdf file to be written.
     */
    QPDF_DLL
    qpdf_data qpdfjob_create_qpdf(qpdfjob_handle j);

    /* This function wraps QPDFJob::writeQPDF. It returns the error code that qpdf would return with
     * the equivalent command-line invocation. Exit code values are defined in Constants.h in the
     * qpdf_exit_code_e type. NOTE it is the callers responsibility to clean up the resources
     * associated with the qpdf_data object by calling qpdf_cleanup after the call to
     * qpdfjob_write_qpdf.
     */
    QPDF_DLL
    int qpdfjob_write_qpdf(qpdfjob_handle j, qpdf_data qpdf);

    /* Allow specification of a custom progress reporter. The progress reporter is only used if
     * progress is otherwise requested (with the --progress option or "progress": "" in the JSON).
     */
    QPDF_DLL
    void qpdfjob_register_progress_reporter(
        qpdfjob_handle j, void (*report_progress)(int percent, void* data), void* data);

#ifdef __cplusplus
}
#endif

#endif /* QPDFJOB_C_H */