text: /*
  ** Copyright (C) 1999-2011 Erik de Castro Lopo <erikd@mega-nerd.com>
  **
  ** 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 <string.h>
  #include <ctype.h>
  #include <stdarg.h>
  
  #include "sndfile.h"
  #include "sfendian.h"
  #include "common.h"
  
  
  /*------------------------------------------------------------------------------
   * Macros to handle big/little endian issues.
  */
  
  #define FORM_MARKER	(MAKE_MARKER ('F', 'O', 'R', 'M'))
  #define SVX8_MARKER	(MAKE_MARKER ('8', 'S', 'V', 'X'))
  #define SV16_MARKER	(MAKE_MARKER ('1', '6', 'S', 'V'))
  #define VHDR_MARKER	(MAKE_MARKER ('V', 'H', 'D', 'R'))
  #define BODY_MARKER	(MAKE_MARKER ('B', 'O', 'D', 'Y'))
  
  #define ATAK_MARKER	(MAKE_MARKER ('A', 'T', 'A', 'K'))
  #define RLSE_MARKER	(MAKE_MARKER ('R', 'L', 'S', 'E'))
  
  #define c_MARKER	(MAKE_MARKER ('(', 'c', ')', ' '))
  #define NAME_MARKER	(MAKE_MARKER ('N', 'A', 'M', 'E'))
  #define AUTH_MARKER	(MAKE_MARKER ('A', 'U', 'T', 'H'))
  #define ANNO_MARKER	(MAKE_MARKER ('A', 'N', 'N', 'O'))
  #define CHAN_MARKER	(MAKE_MARKER ('C', 'H', 'A', 'N'))
  
  /*------------------------------------------------------------------------------
   * Typedefs for file chunks.
  */
  
  typedef struct
  {	unsigned int	oneShotHiSamples, repeatHiSamples, samplesPerHiCycle ;
  	unsigned short	samplesPerSec ;
  	unsigned char	octave, compression ;
  	unsigned int	volume ;
  } VHDR_CHUNK ;
  
  enum {
  	HAVE_FORM	= 0x01,
  
  	HAVE_SVX	= 0x02,
  	HAVE_VHDR	= 0x04,
  	HAVE_BODY	= 0x08
  } ;
  
  /*------------------------------------------------------------------------------
   * Private static functions.
  */
  
  static int	svx_close	(SF_PRIVATE *psf) ;
  static int	svx_write_header (SF_PRIVATE *psf, int calc_length) ;
  static int 	svx_read_header	(SF_PRIVATE *psf) ;
  
  /*------------------------------------------------------------------------------
  ** Public function.
  */
  
  int
  svx_open	(SF_PRIVATE *psf)
  {	int error ;
  
  	if (psf->file.mode == SFM_READ || (psf->file.mode == SFM_RDWR && psf->filelength > 0))
  	{	if ((error = svx_read_header (psf)))
  			return error ;
  
  		psf->endian = SF_ENDIAN_BIG ;			/* All SVX files are big endian. */
  
  		psf->blockwidth = psf->sf.channels * psf->bytewidth ;
  		if (psf->blockwidth)
  			psf->sf.frames = psf->datalength / psf->blockwidth ;
  
  		psf_fseek (psf, psf->dataoffset, SEEK_SET) ;
  		} ;
  
  	if (psf->file.mode == SFM_WRITE || psf->file.mode == SFM_RDWR)
  	{	if (psf->is_pipe)
  			return SFE_NO_PIPE_WRITE ;
  
  		if ((SF_CONTAINER (psf->sf.format)) != SF_FORMAT_SVX)
  			return	SFE_BAD_OPEN_FORMAT ;
  
  		psf->endian = SF_ENDIAN (psf->sf.format) ;
  
  		if (psf->endian == SF_ENDIAN_LITTLE || (CPU_IS_LITTLE_ENDIAN && psf->endian == SF_ENDIAN_CPU))
  			return SFE_BAD_ENDIAN ;
  
  		psf->endian = SF_ENDIAN_BIG ;			/* All SVX files are big endian. */
  
  		error = svx_write_header (psf, SF_FALSE) ;
  		if (error)
  			return error ;
  
  		psf->write_header = svx_write_header ;
  		} ;
  
  	psf->container_close = svx_close ;
  
  	if ((error = pcm_init (psf)))
  		return error ;
  
  	return 0 ;
  } /* svx_open */
  
  /*------------------------------------------------------------------------------
  */
  
  static int
  svx_read_header	(SF_PRIVATE *psf)
  {	VHDR_CHUNK		vhdr ;
  	unsigned int	FORMsize, vhdrsize, dword, marker ;
  	int				filetype = 0, parsestage = 0, done = 0 ;
  	int 			bytecount = 0, channels ;
  
  	if (psf->filelength > SF_PLATFORM_S64 (0xffffffff))
  		psf_log_printf (psf, "Warning : filelength > 0xffffffff. This is bad!!!!\n") ;
  
  	memset (&vhdr, 0, sizeof (vhdr)) ;
  	psf_binheader_readf (psf, "p", 0) ;
  
  	/* Set default number of channels. Modify later if necessary */
  	psf->sf.channels = 1 ;
  
  	psf->sf.format = SF_FORMAT_SVX ;
  
  	while (! done)
  	{	psf_binheader_readf (psf, "m", &marker) ;
  		switch (marker)
  		{	case FORM_MARKER :
  					if (parsestage)
  						return SFE_SVX_NO_FORM ;
  
  					psf_binheader_readf (psf, "E4", &FORMsize) ;
  
  					if (FORMsize != psf->filelength - 2 * sizeof (dword))
  					{	dword = psf->filelength - 2 * sizeof (dword) ;
  						psf_log_printf (psf, "FORM : %d (should be %d)\n", FORMsize, dword) ;
  						FORMsize = dword ;
  						}
  					else
  						psf_log_printf (psf, "FORM : %d\n", FORMsize) ;
  					parsestage |= HAVE_FORM ;
  					break ;
  
  			case SVX8_MARKER :
  			case SV16_MARKER :
  					if (! (parsestage & HAVE_FORM))
  						return SFE_SVX_NO_FORM ;
  					filetype = marker ;
  					psf_log_printf (psf, " %M\n", marker) ;
  					parsestage |= HAVE_SVX ;
  					break ;
  
  			case VHDR_MARKER :
  					if (! (parsestage & (HAVE_FORM | HAVE_SVX)))
  						return SFE_SVX_NO_FORM ;
  
  					psf_binheader_readf (psf, "E4", &vhdrsize) ;
  
  					psf_log_printf (psf, " VHDR : %d\n", vhdrsize) ;
  
  					psf_binheader_readf (psf, "E4442114", &(vhdr.oneShotHiSamples), &(vhdr.repeatHiSamples),
  						&(vhdr.samplesPerHiCycle), &(vhdr.samplesPerSec), &(vhdr.octave), &(vhdr.compression),
  						&(vhdr.volume)) ;
  
  					psf_log_printf (psf, "  OneShotHiSamples  : %d\n", vhdr.oneShotHiSamples) ;
  					psf_log_printf (psf, "  RepeatHiSamples   : %d\n", vhdr.repeatHiSamples) ;
  					psf_log_printf (psf, "  samplesPerHiCycle : %d\n", vhdr.samplesPerHiCycle) ;
  					psf_log_printf (psf, "  Sample Rate       : %d\n", vhdr.samplesPerSec) ;
  					psf_log_printf (psf, "  Octave            : %d\n", vhdr.octave) ;
  
  					psf_log_printf (psf, "  Compression       : %d => ", vhdr.compression) ;
  
  					switch (vhdr.compression)
  					{	case 0 : psf_log_printf (psf, "None.\n") ;
  								break ;
  						case 1 : psf_log_printf (psf, "Fibonacci delta\n") ;
  								break ;
  						case 2 : psf_log_printf (psf, "Exponential delta\n") ;
  								break ;
  						} ;
  
  					psf_log_printf (psf, "  Volume            : %d\n", vhdr.volume) ;
  
  					psf->sf.samplerate 	= vhdr.samplesPerSec ;
  
  					if (filetype == SVX8_MARKER)
  					{	psf->sf.format |= SF_FORMAT_PCM_S8 ;
  						psf->bytewidth = 1 ;
  						}
  					else if (filetype == SV16_MARKER)
  					{	psf->sf.format |= SF_FORMAT_PCM_16 ;
  						psf->bytewidth = 2 ;
  						} ;
  
  					parsestage |= HAVE_VHDR ;
  					break ;
  
  			case BODY_MARKER :
  					if (! (parsestage & HAVE_VHDR))
  						return SFE_SVX_NO_BODY ;
  
  					psf_binheader_readf (psf, "E4", &dword) ;
  					psf->datalength = dword ;
  
  					psf->dataoffset = psf_ftell (psf) ;
  					if (psf->dataoffset < 0)
  						return SFE_SVX_NO_BODY ;
  
  					if (psf->datalength > psf->filelength - psf->dataoffset)
  					{	psf_log_printf (psf, " BODY : %D (should be %D)\n", psf->datalength, psf->filelength - psf->dataoffset) ;
  						psf->datalength = psf->filelength - psf->dataoffset ;
  						}
  					else
  						psf_log_printf (psf, " BODY : %D\n", psf->datalength) ;
  
  					parsestage |= HAVE_BODY ;
  
  					if (! psf->sf.seekable)
  						break ;
  
  					psf_fseek (psf, psf->datalength, SEEK_CUR) ;
  					break ;
  
  			case NAME_MARKER :
  					if (! (parsestage & HAVE_SVX))
  						return SFE_SVX_NO_FORM ;
  
  					psf_binheader_readf (psf, "E4", &dword) ;
  
  					psf_log_printf (psf, " %M : %d\n", marker, dword) ;
  
  					if (strlen (psf->file.name.c) != dword)
  					{	if (dword > sizeof (psf->file.name.c) - 1)
  							return SFE_SVX_BAD_NAME_LENGTH ;
  
  						psf_binheader_readf (psf, "b", psf->file.name.c, dword) ;
  						psf->file.name.c [dword] = 0 ;
  						}
  					else
  						psf_binheader_readf (psf, "j", dword) ;
  					break ;
  
  			case ANNO_MARKER :
  					if (! (parsestage & HAVE_SVX))
  						return SFE_SVX_NO_FORM ;
  
  					psf_binheader_readf (psf, "E4", &dword) ;
  
  					psf_log_printf (psf, " %M : %d\n", marker, dword) ;
  
  					psf_binheader_readf (psf, "j", dword) ;
  					break ;
  
  			case CHAN_MARKER :
  					if (! (parsestage & HAVE_SVX))
  						return SFE_SVX_NO_FORM ;
  
  					psf_binheader_readf (psf, "E4", &dword) ;
  
  					psf_log_printf (psf, " %M : %d\n", marker, dword) ;
  
  					bytecount += psf_binheader_readf (psf, "E4", &channels) ;
  
  					if (channels == 2 || channels == 4)
  						psf_log_printf (psf, "  Channels : %d => mono\n", channels) ;
  					else if (channels == 6)
  					{	psf->sf.channels = 2 ;
  						psf_log_printf (psf, "  Channels : %d => stereo\n", channels) ;
  						}
  					else
  						psf_log_printf (psf, "  Channels : %d *** assuming mono\n", channels) ;
  
  					psf_binheader_readf (psf, "j", dword - bytecount) ;
  					break ;
  
  
  			case AUTH_MARKER :
  			case c_MARKER :
  					if (! (parsestage & HAVE_SVX))
  						return SFE_SVX_NO_FORM ;
  
  					psf_binheader_readf (psf, "E4", &dword) ;
  
  					psf_log_printf (psf, " %M : %d\n", marker, dword) ;
  
  					psf_binheader_readf (psf, "j", dword) ;
  					break ;
  
  			default :
  					if (psf_isprint ((marker >> 24) & 0xFF) && psf_isprint ((marker >> 16) & 0xFF)
  						&& psf_isprint ((marker >> 8) & 0xFF) && psf_isprint (marker & 0xFF))
  					{	psf_binheader_readf (psf, "E4", &dword) ;
  
  						psf_log_printf (psf, "%M : %d (unknown marker)\n", marker, dword) ;
  
  						psf_binheader_readf (psf, "j", dword) ;
  						break ;
  						} ;
  					if ((dword = psf_ftell (psf)) & 0x03)
  					{	psf_log_printf (psf, "  Unknown chunk marker at position %d. Resynching.\n", dword - 4) ;
  
  						psf_binheader_readf (psf, "j", -3) ;
  						break ;
  						} ;
  					psf_log_printf (psf, "*** Unknown chunk marker : %X. Exiting parser.\n", marker) ;
  					done = 1 ;
  			} ;	/* switch (marker) */
  
  		if (! psf->sf.seekable && (parsestage & HAVE_BODY))
  			break ;
  
  		if (psf_ftell (psf) >= psf->filelength - SIGNED_SIZEOF (dword))
  			break ;
  		} ; /* while (1) */
  
  	if (vhdr.compression)
  		return SFE_SVX_BAD_COMP ;
  
  	if (psf->dataoffset <= 0)
  		return SFE_SVX_NO_DATA ;
  
  	return 0 ;
  } /* svx_read_header */
  
  static int
  svx_close (SF_PRIVATE *psf)
  {
  	if (psf->file.mode == SFM_WRITE || psf->file.mode == SFM_RDWR)
  		svx_write_header (psf, SF_TRUE) ;
  
  	return 0 ;
  } /* svx_close */
  
  static int
  svx_write_header (SF_PRIVATE *psf, int calc_length)
  {	static	char 	annotation	[] = "libsndfile by Erik de Castro Lopo\0\0\0" ;
  	sf_count_t	current ;
  
  	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) ;
  		} ;
  
  	psf->header [0] = 0 ;
  	psf->headindex = 0 ;
  	psf_fseek (psf, 0, SEEK_SET) ;
  
  	/* FORM marker and FORM size. */
  	psf_binheader_writef (psf, "Etm8", FORM_MARKER, (psf->filelength < 8) ?
  			psf->filelength * 0 : psf->filelength - 8) ;
  
  	psf_binheader_writef (psf, "m", (psf->bytewidth == 1) ? SVX8_MARKER : SV16_MARKER) ;
  
  	/* VHDR chunk. */
  	psf_binheader_writef (psf, "Em4", VHDR_MARKER, sizeof (VHDR_CHUNK)) ;
  	/* VHDR : oneShotHiSamples, repeatHiSamples, samplesPerHiCycle */
  	psf_binheader_writef (psf, "E444", psf->sf.frames, 0, 0) ;
  	/* VHDR : samplesPerSec, octave, compression */
  	psf_binheader_writef (psf, "E211", psf->sf.samplerate, 1, 0) ;
  	/* VHDR : volume */
  	psf_binheader_writef (psf, "E4", (psf->bytewidth == 1) ? 0xFF : 0xFFFF) ;
  
  	if (psf->sf.channels == 2)
  		psf_binheader_writef (psf, "Em44", CHAN_MARKER, 4, 6) ;
  
  	/* Filename and annotation strings. */
  	psf_binheader_writef (psf, "Emsms", NAME_MARKER, psf->file.name.c, ANNO_MARKER, annotation) ;
  
  	/* BODY marker and size. */
  	psf_binheader_writef (psf, "Etm8", BODY_MARKER, (psf->datalength < 0) ?
  			psf->datalength * 0 : psf->datalength) ;
  
  	psf_fwrite (psf->header, psf->headindex, 1, psf) ;
  
  	if (psf->error)
  		return psf->error ;
  
  	psf->dataoffset = psf->headindex ;
  
  	if (current > 0)
  		psf_fseek (psf, current, SEEK_SET) ;
  
  	return psf->error ;
  } /* svx_write_header */
  
  