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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2016-xxxx
license		=	bsd


%%	header

#ifndef	DK4STRM_H_INCLUDED
#include "dk4strm.h"
#endif

#ifndef	DK4MEMBUF_H_INCLUDED
#include "dk4membuf.h"
#endif

#ifndef	DK4ERROR_H_INCLUDED
#include "dk4error.h"
#endif



#ifdef	__cplusplus
extern "C" {
#endif

/**	Open stream to write to memory buffer.
	Closing the resulting stream does not close the memory buffer.
	@param	mb	Destination memory buffer.
	@param	erp	Error report, may be NULL.
	@return	Valid pointer on success, NULL on error.
*/

dk4_stream_t *
dk4stream_open_membuf_writer(dk4_membuf_t *mb, dk4_er_t *erp);

#ifdef	__cplusplus
}
#endif


/* vim: set ai sw=4 ts=4 : */
%%	module

#include "dk4mbstrm.h"



static
void
dk4stream_membuf_function(dk4_stream_api_t *api)
{
	dk4_membuf_t	*mb;

	if (NULL != api) {
		api->res = 0;
		api->sz_out = 0;
		mb = (dk4_membuf_t *)(api->d);
		if (NULL != mb) {
			switch (api->cmd) {
				case DK4_STREAM_API_WRITE: {
					api->res = dk4membuf_store(
						mb, (const void *)(api->b), api->sz_in, NULL
					);
					if (0 != api->res) {
						api->sz_out = api->sz_in;
					}
				} break;
				case DK4_STREAM_API_FLUSH: {
					/* Do nothing but indicate success. */
					api->res = 1;
				} break;
				case DK4_STREAM_API_CLOSE: {
					/* Do nothing but indicate success. */
					api->res = 1;
				} break;
				default : {
					/* Do nothing, calling this is an error. */
				} break;
			}
		}
	}
}



dk4_stream_t *
dk4stream_open_membuf_writer(dk4_membuf_t *mb, dk4_er_t *erp)
{
	dk4_stream_t	*back	= NULL;
	if (NULL != mb) {
		back = dk4stream_open(
			mb, dk4stream_membuf_function,
			DK4_STREAM_WRITE, 0, DK4MEMBUF_CHUNK_SIZE, erp
		);
	}
	else {
		dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
	}
	return back;
}


/* vim: set ai sw=4 ts=4 : */