/*

** Copyright (C) 2002-2017 Erik de Castro Lopo <erikd@mega-nerd.com>

** Copyright (C) 2007 Reuben Thomas

**

** This program is free software; you can redistribute it and/or modify

** it under the terms of the GNU Lesser General Public License as published by

** the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.

**

** You should have received a copy of the GNU Lesser General Public License

** along with this program; if not, write to the Free Software

** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

*/

#include  "sfconfig.h"

#include  <stdio.h>

#include  <fcntl.h>

#include  <string.h>

#include  <ctype.h>

#include  "sndfile.h"

#include  "sfendian.h"

#include  "common.h"

/*------------------------------------------------------------------------------

** Macros to handle big/little endian issues, and other magic numbers.

*/

#define ALAW_MARKER     MAKE_MARKER ('A', 'L', 'a', 'w')

#define SOUN_MARKER     MAKE_MARKER ('S', 'o', 'u', 'n')

#define DFIL_MARKER     MAKE_MARKER ('d', 'F', 'i', 'l')

#define ESSN_MARKER     MAKE_MARKER ('e', '*', '*', '\0')

#define PSION_VERSION   ((unsigned short) 3856)

#define PSION_DATAOFFSET  0x20

/*------------------------------------------------------------------------------

** Private static functions.

*/

static int  wve_read_header (SF_PRIVATE *psf) ;

static int  wve_write_header (SF_PRIVATE *psf, int calc_length) ;

static int  wve_close (SF_PRIVATE *psf) ;

/*------------------------------------------------------------------------------

** Public function.

*/

int

wve_open (SF_PRIVATE *psf)

{ int error = 0 ;

  if (psf->is_pipe)

    return SFE_WVE_NO_PIPE ;

  if (psf->file.mode == SFM_READ || (psf->file.mode == SFM_RDWR && psf->filelength > 0))

  { if ((error = wve_read_header (psf)))

      return error ;

    } ;

  if (psf->file.mode == SFM_WRITE || psf->file.mode == SFM_RDWR)

  { if ((SF_CONTAINER (psf->sf.format)) != SF_FORMAT_WVE)

      return  SFE_BAD_OPEN_FORMAT ;

    psf->endian = SF_ENDIAN_BIG ;

    if ((error = wve_write_header (psf, SF_FALSE)))

      return error ;

    psf->write_header = wve_write_header ;

    } ;

  psf->blockwidth = psf->bytewidth * psf->sf.channels ;

  psf->container_close = wve_close ;

  error = alaw_init (psf) ;

  return error ;

} /* wve_open */

/*------------------------------------------------------------------------------

*/

static int

wve_read_header (SF_PRIVATE *psf)

{ int marker ;

  unsigned short version, padding, repeats, trash ;

  unsigned datalength ;

  /* Set position to start of file to begin reading header. */

  psf_binheader_readf (psf, "pm", 0, &marker) ;

  if (marker != ALAW_MARKER)

  { psf_log_printf (psf, "Could not find '%M'\n", ALAW_MARKER) ;

    return SFE_WVE_NOT_WVE ;

    } ;

  psf_binheader_readf (psf, "m", &marker) ;

  if (marker != SOUN_MARKER)

  { psf_log_printf (psf, "Could not find '%M'\n", SOUN_MARKER) ;

    return SFE_WVE_NOT_WVE ;

    } ;

  psf_binheader_readf (psf, "m", &marker) ;

  if (marker != DFIL_MARKER)

  { psf_log_printf (psf, "Could not find '%M'\n", DFIL_MARKER) ;

    return SFE_WVE_NOT_WVE ;

    } ;

  psf_binheader_readf (psf, "m", &marker) ;

  if (marker != ESSN_MARKER)

  { psf_log_printf (psf, "Could not find '%M'\n", ESSN_MARKER) ;

    return SFE_WVE_NOT_WVE ;

    } ;

  psf_binheader_readf (psf, "E2", &version) ;

  psf_log_printf (psf, "Psion Palmtop Alaw (.wve)\n"

      "  Sample Rate : 8000\n"

      "  Channels    : 1\n"

      "  Encoding    : A-law\n") ;

  if (version != PSION_VERSION)

    psf_log_printf (psf, "Psion version %d should be %d\n", version, PSION_VERSION) ;

  psf_binheader_readf (psf, "E4", &datalength) ;

  psf->dataoffset = PSION_DATAOFFSET ;

  if (datalength != psf->filelength - psf->dataoffset)

  { psf->datalength = psf->filelength - psf->dataoffset ;

    psf_log_printf (psf, "Data length %d should be %D\n", datalength, psf->datalength) ;

    }

  else

    psf->datalength = datalength ;

  psf_binheader_readf (psf, "E22222", &padding, &repeats, &trash, &trash, &trash) ;

  psf->sf.format    = SF_FORMAT_WVE | SF_FORMAT_ALAW ;

  psf->sf.samplerate  = 8000 ;

  psf->sf.frames    = psf->datalength ;

  psf->sf.channels  = 1 ;

  return SFE_NO_ERROR ;

} /* wve_read_header */

/*------------------------------------------------------------------------------

*/

static int

wve_write_header (SF_PRIVATE *psf, int calc_length)

{ sf_count_t  current ;

  unsigned datalen ;

  current = psf_ftell (psf) ;

  if (calc_length)

  { psf->filelength = psf_get_filelen (psf) ;

    psf->datalength = psf->filelength - psf->dataoffset ;

    if (psf->dataend)

      psf->datalength -= psf->filelength - psf->dataend ;

    psf->sf.frames = psf->datalength / (psf->bytewidth * psf->sf.channels) ;

    } ;

  /* Reset the current header length to zero. */

  psf->header.ptr [0] = 0 ;

  psf->header.indx = 0 ;

  psf_fseek (psf, 0, SEEK_SET) ;

  /* Write header. */

  datalen = psf->datalength ;

  psf_binheader_writef (psf, "Emmmm", BHWm (ALAW_MARKER), BHWm (SOUN_MARKER), BHWm (DFIL_MARKER), BHWm (ESSN_MARKER)) ;

  psf_binheader_writef (psf, "E2422222", BHW2 (PSION_VERSION), BHW4 (datalen), BHW2 (0), BHW2 (0), BHW2 (0), BHW2 (0), BHW2 (0)) ;

  psf_fwrite (psf->header.ptr, psf->header.indx, 1, psf) ;

  if (psf->sf.channels != 1)

    return SFE_CHANNEL_COUNT ;

  if (psf->error)

    return psf->error ;

  psf->dataoffset = psf->header.indx ;

  if (current > 0)

    psf_fseek (psf, current, SEEK_SET) ;

  return psf->error ;

} /* wve_write_header */

/*------------------------------------------------------------------------------

*/

static int

wve_close (SF_PRIVATE *psf)

{

  if (psf->file.mode == SFM_WRITE || psf->file.mode == SFM_RDWR)

  { /*  Now we know for certain the length of the file we can re-write

    **  the header.

    */

    wve_write_header (psf, SF_TRUE) ;

    } ;

  return 0 ;

} /* wve_close */