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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2015-xxxx
license		=	bsd



%%	header

/**	@file
	Generic dk4_stream_t API for input
	and output, implementation for gzfile.

	CRT on Windows: Required.
*/

#ifndef DK4CONF_H_INCLUDED
#include "dk4conf.h"
#endif

#if DK4_HAVE_ZLIB_H

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

#ifndef ZLIB_H_INCLUDED
#include <zlib.h>
#define	ZLIB_H_INCLUDED 1
#endif

#ifdef __cplusplus
extern "C" {
#endif

/**	Low level function to access a gzFile.
	@param	api	The stream API structure for arguments and results.
*/
void
dk4stream_gzfile_function(dk4_stream_api_t *api);

/**	Low level function to access a gzFile and close it on
	dk4stream_close().
	@param	api	The stream API structure for arguments and results.
*/
void
dk4stream_gzfile_with_close_function(dk4_stream_api_t *api);

/**	Open a stream for an existing gzFile.
	@param	fipo	Existing gzFile, not closed on dk4stream_close().
	@param	fl	Access flag: DK4_STREAM_READ,, DK4_STREAM_WRITE
			or (DK4_STREAM_READ | DK4_STREAM_WRITE).
	@param	ibs	Input buffer size (0 for default).
	@param	obs	Output buffer size (0 for default).
	@param	erp	Error report, may be NULL.
	@return	Pointer to stream on success, NULL on error.
*/
dk4_stream_t *
dk4stream_open_for_gzfile(
  gzFile	 fipo,
  int		 fl,
  size_t	 ibs,
  size_t	 obs,
  dk4_er_t	*erp
);

/**	Open a stream for an existing gzFile.
	@param	fipo	Existing gzFile, closed on dk4stream_close().
	@param	fl	Access flag: DK4_STREAM_READ,, DK4_STREAM_WRITE
			or (DK4_STREAM_READ | DK4_STREAM_WRITE).
	@param	ibs	Input buffer size (0 for default).
	@param	obs	Output buffer size (0 for default).
	@param	erp	Error report, may be NULL.
	@return	Pointer to stream on success, NULL on error.
*/
dk4_stream_t *
dk4stream_open_for_gzfile_with_close(
  gzFile	 fipo,
  int		 fl,
  size_t	 ibs,
  size_t	 obs,
  dk4_er_t	*erp
);

#ifdef __cplusplus
}
#endif

#endif

%%	module

#include "dk4conf.h"

#if DK4_HAVE_ZLIB_H

#include "dk4strm.h"
#include "dk4strmg.h"



void
dk4stream_gzfile_with_close_function(dk4_stream_api_t *api)
{
  gzFile	 fipo;
  int		 res;
  if (NULL != api) {
    api->res = 0;
    api->sz_out = 0;
    fipo = (gzFile)(api->d);
    if (NULL != fipo) {
      switch (api->cmd) {
        case DK4_STREAM_API_READ: {
	  res = gzread(fipo, api->b, (int)(api->sz_in));
	  if (0 < res) {
	    api->res = 1;
	    api->sz_out = (size_t)res;
	  }
	} break;
	case DK4_STREAM_API_WRITE: {
	  res = gzwrite(fipo, api->b, (int)(api->sz_in));
	  if (res == (int)(api->sz_in)) {
	    api->res = 1;
	  }
	  if (0 <= res) { api->sz_out = (size_t)res; }
	  else          { api->sz_out = 0; }
	} break;
	case DK4_STREAM_API_FLUSH: {
	  if (Z_OK == gzflush(fipo, Z_FULL_FLUSH)) {
	    api->res = 1;
	  }
	} break;
	case DK4_STREAM_API_AT_END: {
	  if (1 == gzeof(fipo)) {
	    api->res = 1;
	  }
	} break;
	case DK4_STREAM_API_CLOSE: {
	  if (Z_OK == gzclose(fipo)) {
	    api->res = 1;
	  }
	} break;
      }
    }
  } else {
  }
}



void
dk4stream_gzfile_function(dk4_stream_api_t *api)
{
  if (NULL != api) {
    switch (api->cmd) {
      case DK4_STREAM_API_CLOSE: {
        api->res = 1;
      } break;
      default: {
        dk4stream_gzfile_with_close_function(api);
      } break;
    }
  }
}



dk4_stream_t *
dk4stream_open_for_gzfile(
  gzFile	 fipo,
  int		 fl,
  size_t	 ibs,
  size_t	 obs,
  dk4_er_t	*erp
)
{
  return (
    dk4stream_open( (void *)fipo, dk4stream_gzfile_function, fl, ibs, obs, erp )
  );
}



dk4_stream_t *
dk4stream_open_for_gzfile_with_close(
  gzFile	 fipo,
  int		 fl,
  size_t	 ibs,
  size_t	 obs,
  dk4_er_t	*erp
)
{
  return (
    dk4stream_open(
      (void *)fipo, dk4stream_gzfile_with_close_function, fl, ibs, obs, erp
    )
  );
}


#endif