xref: /aosp_15_r20/external/libcups/examples/ppdx.h (revision 5e7646d21f1134fb0638875d812ef646c12ab91e)

/*
 * Header for PPD data encoding example code.
 *
 * Copyright 2012 by Apple Inc.
 *
 * Licensed under Apache License v2.0.  See the file "LICENSE" for more information.
 */

#ifndef _PPDX_H_
#  define _PPDX_H_


/*
 * Include necessary headers...
 */

#  include <cups/ppd.h>


/*
 * C++ magic...
 */

#  ifdef __cplusplus
extern "C" {
#  endif /* __cplusplus */


/*
 * Maximum amount of data to encode/decode...
 */

#  define PPDX_MAX_STATUS	1024	/* Limit on log messages in 10.6 */
#  define PPDX_MAX_DATA		16777216/* 16MiB */


/*
 * 'ppdxReadData()' - Read encoded data from a ppd_file_t *.
 *
 * Reads chunked data in the PPD file "ppd" using the prefix "name".  Returns
 * an allocated pointer to the data (which is nul-terminated for convenience)
 * along with the length of the data in the variable pointed to by "datasize",
 * which can be NULL to indicate the caller doesn't need the length.
 *
 * Returns NULL if no data is present in the PPD with the prefix.
 */

extern void	*ppdxReadData(ppd_file_t *ppd, const char *name,
		              size_t *datasize);


/*
 * 'ppdxWriteData()' - Writes encoded data to stderr using PPD: messages.
 *
 * Writes chunked data to the PPD file using PPD: messages sent to stderr for
 * cupsd.  "name" must be a valid PPD keyword string whose length is less than
 * 37 characters to allow for chunk numbering.  "data" provides a pointer to the
 * data to be written, and "datasize" provides the length.
 */

extern void	ppdxWriteData(const char *name, const void *data,
			      size_t datasize);


#  ifdef __cplusplus
}
#  endif /* __cplusplus */

#endif /* !_PPDX_H */