/*
 * Copyright (c) 1983-2023 Trevor Wishart and Composers Desktop Project Ltd
 * http://www.trevorwishart.co.uk
 * http://www.composersdesktop.com
 *
 This file is part of the CDP System.

 The CDP System 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.

 The CDP System 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 the CDP System; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 02111-1307 USA
 *
 */



/* MCHZIG  zigzag with mchan output
 */

#include <stdio.h>
#include <stdlib.h>
#include <structures.h>
#include <tkglobals.h>
#include <pnames.h>
#include <filetype.h>
#include <processno.h>
#include <modeno.h>
#include <logic.h>
#include <globcon.h>
#include <cdpmain.h>
#include <math.h>
#include <mixxcon.h>
#include <osbind.h>
#include <standalone.h>
#include <ctype.h>
#include <sfsys.h>
#include <string.h>
#include <srates.h>
#include <extdcon.h>
#include <arrays.h>
#include <flags.h>
//#include <memory.h>
//#include <string.h>

#if defined unix || defined __GNUC__
#define round(x) lround((x))
#endif
#ifndef HUGE
#define HUGE 3.40282347e+38F
#endif

char errstr[2400];

int anal_infiles = 1;
int     sloom = 0;
int sloombatch = 0;

const char* cdp_version = "7.1.0";

/* internal */
#define MZIG_SPLICECNT (8)
#define MZIG_SPLSAMPS  (9)
#define MZIG_RUNSTOEND (10)

#define MZIG_PERMCH     (0)

#define ZIG             (1)
#define UNKNOWN (0)
#define ZAG             (-1)

#define NORMAL  (0)
#define REVERSE (1)

#define FORWARDS        (1)
#define BACKWARDS       (-1)

#define ROOT2           (1.4142136)

#define SECMARGIN  (256)

static int get_the_process_no(char *prog_identifier_from_cmdline,dataptr dz);
static int get_the_mode_from_cmdline(char *str,dataptr dz);
static int setup_mchzig_application(dataptr dz);
static int setup_mchzig_param_ranges_and_defaults(dataptr dz);
static int parse_sloom_data(int argc,char *argv[],char ***cmdline,int *cmdlinecnt,dataptr dz);
static int parse_infile_and_check_type(char **cmdline,dataptr dz);
static int handle_the_outfile(int *cmdlinecnt,char ***cmdline,dataptr dz);
static int open_the_outfile(dataptr dz);

static int setup_and_init_input_param_activity(dataptr dz,int tipc);
static int setup_input_param_defaultval_stores(int tipc,aplptr ap);
static int establish_application(dataptr dz);
static int initialise_vflags(dataptr dz);
static int setup_parameter_storage_and_constants(int storage_cnt,dataptr dz);
static int initialise_is_int_and_no_brk_constants(int storage_cnt,dataptr dz);
static int mark_parameter_types(dataptr dz,aplptr ap);
static int assign_file_data_storage(int infilecnt,dataptr dz);
static int get_tk_cmdline_word(int *cmdlinecnt,char ***cmdline,char *q);
static int setup_and_init_input_brktable_constants(dataptr dz,int brkcnt);

static int check_zigzag_consistency(dataptr dz);
static int mzigzag_preprocess(int *maxzig,dataptr dz);

static int handle_the_special_data(int *cmdlinecnt,char ***cmdline,dataptr dz);
static int setup_the_special_data_ranges(int mode,int srate,double duration,double nyquist,int wlength,int channels,aplptr ap);
static int read_ziginfo(char *filename,dataptr dz);

static int setup_zigzag_splice(int paramno,dataptr dz);
static int make_zigsplice(int paramno,dataptr dz);
static int create_zigzag_splicebuffer(dataptr dz);
static int generate_zigzag_table(dataptr dz);
static int sort_zigs(int *maxzig,dataptr dz);
static int eliminate_n_steps(int *this_zigtime,int *next_zigtime,int **ziglistend,int *cnt,dataptr dz);
static int eliminate_step(int *next_zigtime,int **ziglistend,int *cnt,dataptr dz);
static int zigzag(dataptr dz);
static int zig_or_zag(int *thisstart,int *lastend,int *outbuf_space,int obufno,int obufendno,int startchan,int endchan,dataptr dz);
static int find_zzchunk(int *thisstart,int *ziglistend, int *minsamp, dataptr dz);
static int reverse_it(int incnt,dataptr dz);
static int copy_with_spatial_scatter(float *outptr,float *tobufend,int startchan,int endchan,int sampcnt,int chancnt,dataptr dz);
static void permute_chans(int outchans,dataptr dz);
static void insertch(int n,int t,int outchans,dataptr dz);
static void prefixch(int n,int outchans,dataptr dz);
static void shuflupch(int k,int outchans,dataptr dz);
static int mz_setup_internal_arrays_and_array_pointers(dataptr dz);
static void pancalc(double position,double *leftgain,double *rightgain);
static void get_bufsize_needed(int *maxzig,dataptr dz);
static int create_mzig_sndbufs(int maxzig,dataptr dz);
static void do_start_splice(float *buf,dataptr dz);
static void do_end_splice(float *buf,int incnt,dataptr dz);

static int adjacence(int endchan,dataptr dz);

/**************************************** MAIN *********************************************/

int main(int argc,char *argv[])
{
    int exit_status;
    dataptr dz = NULL;
    char **cmdline;
    int  cmdlinecnt;
    int n, maxzig;
    //aplptr ap;
    int is_launched = FALSE;
    if(argc==2 && (strcmp(argv[1],"--version") == 0)) {
        fprintf(stdout,"%s\n",cdp_version);
        fflush(stdout);
        return 0;
    }
    /* CHECK FOR SOUNDLOOM */
    if((sloom = sound_loom_in_use(&argc,&argv)) > 1) {
        sloom = 0;
        sloombatch = 1;
    }
    if(sflinit("cdp")){
        sfperror("cdp: initialisation\n");
        return(FAILED);
    }
    /* SET UP THE PRINCIPLE DATASTRUCTURE */
    if((exit_status = establish_datastructure(&dz))<0) {                                    // CDP LIB
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    if(!sloom) {
        if(argc == 1) {
            usage1();
            return(FAILED);
        } else if(argc == 2) {
            usage2(argv[1]);
            return(FAILED);
        }
    }
    if(!sloom) {
        if((exit_status = make_initial_cmdline_check(&argc,&argv))<0) {         // CDP LIB
            print_messages_and_close_sndfiles(exit_status,is_launched,dz);
            return(FAILED);
        }
        cmdline    = argv;
        cmdlinecnt = argc;
        if((get_the_process_no(argv[0],dz))<0)
            return(FAILED);
        cmdline++;
        cmdlinecnt--;
        dz->maxmode = 2;
        if((exit_status = get_the_mode_from_cmdline(cmdline[0],dz))<0) {
            print_messages_and_close_sndfiles(exit_status,is_launched,dz);
            return(exit_status);
        }
        cmdline++;
        cmdlinecnt--;
        // setup_particular_application =
        if((exit_status = setup_mchzig_application(dz))<0) {
            print_messages_and_close_sndfiles(exit_status,is_launched,dz);
            return(FAILED);
        }
        if((exit_status = count_and_allocate_for_infiles(cmdlinecnt,cmdline,dz))<0) {           // CDP LIB
            print_messages_and_close_sndfiles(exit_status,is_launched,dz);
            return(FAILED);
        }
    } else {
        //parse_TK_data() =
        if((exit_status = parse_sloom_data(argc,argv,&cmdline,&cmdlinecnt,dz))<0) {
            exit_status = print_messages_and_close_sndfiles(exit_status,is_launched,dz);
            return(exit_status);
        }
    }
    //ap = dz->application;

    // parse_infile_and_hone_type() =
    if((exit_status = parse_infile_and_check_type(cmdline,dz))<0) {
        exit_status = print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    // setup_param_ranges_and_defaults() =
    if((exit_status = setup_mchzig_param_ranges_and_defaults(dz))<0) {
        exit_status = print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    // open_first_infile            CDP LIB
    if((exit_status = open_first_infile(cmdline[0],dz))<0) {
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    cmdlinecnt--;
    cmdline++;

    //      handle_extra_infiles() : redundant
    // handle_outfile() =
    if((exit_status = handle_the_outfile(&cmdlinecnt,&cmdline,dz))<0) {
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }

    //      handle_formants()                       redundant
    //      handle_formant_quiksearch()     redundant
    //      handle_special_data() =
    if(dz->mode == 1) {
        if((exit_status = handle_the_special_data(&cmdlinecnt,&cmdline,dz))<0) {
            print_messages_and_close_sndfiles(exit_status,is_launched,dz);
            return(FAILED);
        }
    }
    if((exit_status = read_parameters_and_flags(&cmdline,&cmdlinecnt,dz))<0) {              // CDP LIB
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    //      check_param_validity_and_consistency....
    if((exit_status = check_zigzag_consistency(dz))<0) {
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    is_launched = TRUE;
    dz->bufcnt = 2 + dz->iparam[MZIG_OCHANS];
    dz->extra_bufcnt = 1;
    if((dz->sampbuf = (float **)malloc(sizeof(float *) * (dz->bufcnt+1)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY establishing sample buffers.\n");
        return(MEMORY_ERROR);
    }
    if((dz->sbufptr = (float **)malloc(sizeof(float *) * dz->bufcnt))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY establishing sample buffer pointers.\n");
        return(MEMORY_ERROR);
    }
    for(n = 0;n <dz->bufcnt; n++)
        dz->sampbuf[n] = dz->sbufptr[n] = (float *)0;
    dz->sampbuf[n] = (float *)0;
    if((dz->extrabuf = (float **)malloc(sizeof(float *) * (dz->extra_bufcnt+1)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY establishing extra buffers.\n");
        return(MEMORY_ERROR);
    }
    if((dz->extrabufptr = (float **)malloc(sizeof(float *) * (dz->extra_bufcnt+1)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY establishing extrabuffer pointers.\n");
        return(MEMORY_ERROR);
    }
    for(n = 0;n <dz->extra_bufcnt; n++)
        dz->extrabuf[n] = dz->extrabufptr[n] = (float *)0;
    dz->extrabuf[n] = (float *)0;
    //param_preprocess() ...........
    if((exit_status = mzigzag_preprocess(&maxzig,dz))<0) {
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    if((exit_status = create_mzig_sndbufs(maxzig,dz))<0) {                                                                          // CDP LIB
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    if((exit_status = open_the_outfile(dz))<0) {
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    //groucho_process_file =
    if((exit_status = zigzag(dz))<0) {
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    if((exit_status = complete_output(dz))<0) {                                                                             // CDP LIB
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    exit_status = print_messages_and_close_sndfiles(FINISHED,is_launched,dz);               // CDP LIB
    free(dz);
    return(SUCCEEDED);
}

/**********************************************
                REPLACED CDP LIB FUNCTIONS
**********************************************/


/****************************** SET_PARAM_DATA *********************************/

int set_param_data(aplptr ap, int special_data,int maxparamcnt,int paramcnt,char *paramlist)
{
    ap->special_data   = (char)special_data;
    ap->param_cnt      = (char)paramcnt;
    ap->max_param_cnt  = (char)maxparamcnt;
    if(ap->max_param_cnt>0) {
        if((ap->param_list = (char *)malloc((size_t)(ap->max_param_cnt+1)))==NULL) {
            sprintf(errstr,"INSUFFICIENT MEMORY: for param_list\n");
            return(MEMORY_ERROR);
        }
        strcpy(ap->param_list,paramlist);
    }
    return(FINISHED);
}

/****************************** SET_VFLGS *********************************/

int set_vflgs
(aplptr ap,char *optflags,int optcnt,char *optlist,char *varflags,int vflagcnt, int vparamcnt,char *varlist)
{
    ap->option_cnt   = (char) optcnt;                       /*RWD added cast */
    if(optcnt) {
        if((ap->option_list = (char *)malloc((size_t)(optcnt+1)))==NULL) {
            sprintf(errstr,"INSUFFICIENT MEMORY: for option_list\n");
            return(MEMORY_ERROR);
        }
        strcpy(ap->option_list,optlist);
        if((ap->option_flags = (char *)malloc((size_t)(optcnt+1)))==NULL) {
            sprintf(errstr,"INSUFFICIENT MEMORY: for option_flags\n");
            return(MEMORY_ERROR);
        }
        strcpy(ap->option_flags,optflags);
    }
    ap->vflag_cnt = (char) vflagcnt;
    ap->variant_param_cnt = (char) vparamcnt;
    if(vflagcnt) {
        if((ap->variant_list  = (char *)malloc((size_t)(vflagcnt+1)))==NULL) {
            sprintf(errstr,"INSUFFICIENT MEMORY: for variant_list\n");
            return(MEMORY_ERROR);
        }
        strcpy(ap->variant_list,varlist);
        if((ap->variant_flags = (char *)malloc((size_t)(vflagcnt+1)))==NULL) {
            sprintf(errstr,"INSUFFICIENT MEMORY: for variant_flags\n");
            return(MEMORY_ERROR);
        }
        strcpy(ap->variant_flags,varflags);

    }
    return(FINISHED);
}

/***************************** APPLICATION_INIT **************************/

int application_init(dataptr dz)
{
    int exit_status;
    int storage_cnt;
    int tipc, brkcnt;
    aplptr ap = dz->application;
    if(ap->vflag_cnt>0)
        initialise_vflags(dz);
    tipc  = ap->max_param_cnt + ap->option_cnt + ap->variant_param_cnt;
    ap->total_input_param_cnt = (char)tipc;
    if(tipc>0) {
        if((exit_status = setup_input_param_range_stores(tipc,ap))<0)
            return(exit_status);
        if((exit_status = setup_input_param_defaultval_stores(tipc,ap))<0)
            return(exit_status);
        if((exit_status = setup_and_init_input_param_activity(dz,tipc))<0)
            return(exit_status);
    }
    brkcnt = tipc;
    //THERE ARE NO INPUTFILE brktables USED IN THIS PROCESS
    if(brkcnt>0) {
        if((exit_status = setup_and_init_input_brktable_constants(dz,brkcnt))<0)
            return(exit_status);
    }
    if((storage_cnt = tipc + ap->internal_param_cnt)>0) {
        if((exit_status = setup_parameter_storage_and_constants(storage_cnt,dz))<0)
            return(exit_status);
        if((exit_status = initialise_is_int_and_no_brk_constants(storage_cnt,dz))<0)
            return(exit_status);
    }
    if((exit_status = mark_parameter_types(dz,ap))<0)
        return(exit_status);

    // establish_infile_constants() replaced by
    dz->infilecnt = 1;
    //establish_bufptrs_and_extra_buffers():
    if((exit_status = mz_setup_internal_arrays_and_array_pointers(dz))<0)
        return(exit_status);
    return(FINISHED);
}

/********************** SETUP_PARAMETER_STORAGE_AND_CONSTANTS ********************/
/* RWD mallo changed to calloc; helps debug verison run as release! */

int setup_parameter_storage_and_constants(int storage_cnt,dataptr dz)
{
    if((dz->param       = (double *)calloc(storage_cnt, sizeof(double)))==NULL) {
        sprintf(errstr,"setup_parameter_storage_and_constants(): 1\n");
        return(MEMORY_ERROR);
    }
    if((dz->iparam      = (int    *)calloc(storage_cnt, sizeof(int)   ))==NULL) {
        sprintf(errstr,"setup_parameter_storage_and_constants(): 2\n");
        return(MEMORY_ERROR);
    }
    if((dz->is_int      = (char   *)calloc(storage_cnt, sizeof(char)))==NULL) {
        sprintf(errstr,"setup_parameter_storage_and_constants(): 3\n");
        return(MEMORY_ERROR);
    }
    if((dz->no_brk      = (char   *)calloc(storage_cnt, sizeof(char)))==NULL) {
        sprintf(errstr,"setup_parameter_storage_and_constants(): 5\n");
        return(MEMORY_ERROR);
    }
    return(FINISHED);
}

/************** INITIALISE_IS_INT_AND_NO_BRK_CONSTANTS *****************/

int initialise_is_int_and_no_brk_constants(int storage_cnt,dataptr dz)
{
    int n;
    for(n=0;n<storage_cnt;n++) {
        dz->is_int[n] = (char)0;
        dz->no_brk[n] = (char)0;
    }
    return(FINISHED);
}

/***************************** MARK_PARAMETER_TYPES **************************/

int mark_parameter_types(dataptr dz,aplptr ap)
{
    int n, m;                                                       /* PARAMS */
    for(n=0;n<ap->max_param_cnt;n++) {
        switch(ap->param_list[n]) {
        case('0'):      break; /* dz->is_active[n] = 0 is default */
        case('i'):      dz->is_active[n] = (char)1; dz->is_int[n] = (char)1;dz->no_brk[n] = (char)1; break;
        case('I'):      dz->is_active[n] = (char)1;     dz->is_int[n] = (char)1;                                                 break;
        case('d'):      dz->is_active[n] = (char)1;                                                     dz->no_brk[n] = (char)1; break;
        case('D'):      dz->is_active[n] = (char)1;     /* normal case: double val or brkpnt file */     break;
        default:
            sprintf(errstr,"Programming error: invalid parameter type in mark_parameter_types()\n");
            return(PROGRAM_ERROR);
        }
    }                                                               /* OPTIONS */
    for(n=0,m=ap->max_param_cnt;n<ap->option_cnt;n++,m++) {
        switch(ap->option_list[n]) {
        case('i'): dz->is_active[m] = (char)1; dz->is_int[m] = (char)1; dz->no_brk[m] = (char)1; break;
        case('I'): dz->is_active[m] = (char)1; dz->is_int[m] = (char)1;                                                  break;
        case('d'): dz->is_active[m] = (char)1;                                                  dz->no_brk[m] = (char)1; break;
        case('D'): dz->is_active[m] = (char)1;  /* normal case: double val or brkpnt file */     break;
        default:
            sprintf(errstr,"Programming error: invalid option type in mark_parameter_types()\n");
            return(PROGRAM_ERROR);
        }
    }                                                               /* VARIANTS */
    for(n=0,m=ap->max_param_cnt + ap->option_cnt;n < ap->variant_param_cnt; n++, m++) {
        switch(ap->variant_list[n]) {
        case('0'): break;
        case('i'): dz->is_active[m] = (char)1; dz->is_int[m] = (char)1; dz->no_brk[m] = (char)1; break;
        case('I'): dz->is_active[m] = (char)1; dz->is_int[m] = (char)1;                                                  break;
        case('d'): dz->is_active[m] = (char)1;                                                  dz->no_brk[m] = (char)1; break;
        case('D'): dz->is_active[m] = (char)1; /* normal case: double val or brkpnt file */              break;
        default:
            sprintf(errstr,"Programming error: invalid variant type in mark_parameter_types()\n");
            return(PROGRAM_ERROR);
        }
    }                                                               /* INTERNAL */
    for(n=0,
            m=ap->max_param_cnt + ap->option_cnt + ap->variant_param_cnt; n<ap->internal_param_cnt; n++,m++) {
        switch(ap->internal_param_list[n]) {
        case('0'):  break;       /* dummy variables: variables not used: but important for internal paream numbering!! */
        case('i'):      dz->is_int[m] = (char)1;        dz->no_brk[m] = (char)1;        break;
        case('d'):                                                              dz->no_brk[m] = (char)1;        break;
        default:
            sprintf(errstr,"Programming error: invalid internal param type in mark_parameter_types()\n");
            return(PROGRAM_ERROR);
        }
    }
    return(FINISHED);
}

/************************ HANDLE_THE_OUTFILE *********************/

int handle_the_outfile(int *cmdlinecnt,char ***cmdline,dataptr dz)
{
    char *filename = (*cmdline)[0];
    if(filename[0]=='-' && filename[1]=='f') {
        dz->floatsam_output = 1;
        dz->true_outfile_stype = SAMP_FLOAT;
        filename+= 2;
    }
    if(!sloom) {
        if(file_has_invalid_startchar(filename) || value_is_numeric(filename)) {
            sprintf(errstr,"Outfile name %s has invalid start character(s) or looks too much like a number.\n",filename);
            return(DATA_ERROR);
        }
    }
    strcpy(dz->outfilename,filename);
    (*cmdline)++;
    (*cmdlinecnt)--;
    return(FINISHED);
}

/************************ OPEN_THE_OUTFILE *********************/

int open_the_outfile(dataptr dz)
{
    int exit_status;
    dz->infile->channels  = dz->iparam[MZIG_OCHANS];
    dz->outfile->channels = dz->iparam[MZIG_OCHANS];
    if((exit_status = create_sized_outfile(dz->outfilename,dz))<0)
        return(exit_status);
    dz->infile->channels = 1;
    return(FINISHED);
}

/***************************** ESTABLISH_APPLICATION **************************/

int establish_application(dataptr dz)
{
    aplptr ap;
    if((dz->application = (aplptr)malloc(sizeof (struct applic)))==NULL) {
        sprintf(errstr,"establish_application()\n");
        return(MEMORY_ERROR);
    }
    ap = dz->application;
    memset((char *)ap,0,sizeof(struct applic));
    return(FINISHED);
}

/************************* INITIALISE_VFLAGS *************************/

int initialise_vflags(dataptr dz)
{
    int n;
    if((dz->vflag  = (char *)malloc(dz->application->vflag_cnt * sizeof(char)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY: vflag store,\n");
        return(MEMORY_ERROR);
    }
    for(n=0;n<dz->application->vflag_cnt;n++)
        dz->vflag[n]  = FALSE;
    return FINISHED;
}

/************************* SETUP_INPUT_PARAM_DEFAULTVALS *************************/

int setup_input_param_defaultval_stores(int tipc,aplptr ap)
{
    int n;
    if((ap->default_val = (double *)malloc(tipc * sizeof(double)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY for application default values store\n");
        return(MEMORY_ERROR);
    }
    for(n=0;n<tipc;n++)
        ap->default_val[n] = 0.0;
    return(FINISHED);
}

/***************************** SETUP_AND_INIT_INPUT_PARAM_ACTIVITY **************************/

int setup_and_init_input_param_activity(dataptr dz,int tipc)
{
    int n;
    if((dz->is_active = (char   *)malloc((size_t)tipc))==NULL) {
        sprintf(errstr,"setup_and_init_input_param_activity()\n");
        return(MEMORY_ERROR);
    }
    for(n=0;n<tipc;n++)
        dz->is_active[n] = (char)0;
    return(FINISHED);
}

/************************* SETUP_MCHZIG_APPLICATION *******************/

int setup_mchzig_application(dataptr dz)
{
    int exit_status;
    aplptr ap;
    if((exit_status = establish_application(dz))<0)         // GLOBAL
        return(FAILED);
    ap = dz->application;
    // SEE parstruct FOR EXPLANATION of next 2 functions
    switch(dz->mode) {
    case(0): exit_status = set_param_data(ap,0          , 5,5,"ddddi"); break;
    case(1): exit_status = set_param_data(ap,MZIGDATA,5,1,"0000i"); break;
    }
    if(exit_status <0)
        return(FAILED);
    switch(dz->mode) {
    case(0): exit_status = set_vflgs(ap,"smr",3,"ddi","a",1,0,"0"); break;
    case(1): exit_status = set_vflgs(ap,"s"  ,1,"d"  ,"a",1,0,"0"); break;
    }
    if(exit_status <0)
        return(FAILED);
    // set_legal_infile_structure -->
    dz->has_otherfile = FALSE;
    // assign_process_logic -->
    dz->input_data_type = SNDFILES_ONLY;
    dz->process_type        = UNEQUAL_SNDFILE;
    dz->outfiletype         = SNDFILE_OUT;
    return application_init(dz);    //GLOBAL
}

/************************* PARSE_INFILE_AND_CHECK_TYPE *******************/

int parse_infile_and_check_type(char **cmdline,dataptr dz)
{
    int exit_status;
    infileptr infile_info;
    if(!sloom) {
        if((infile_info = (infileptr)malloc(sizeof(struct filedata)))==NULL) {
            sprintf(errstr,"INSUFFICIENT MEMORY for infile structure to test file data.");
            return(MEMORY_ERROR);
        } else if((exit_status = cdparse(cmdline[0],infile_info))<0) {
            sprintf(errstr,"Failed to parse input file %s\n",cmdline[0]);
            return(PROGRAM_ERROR);
        } else if(infile_info->filetype != SNDFILE)  {
            sprintf(errstr,"File %s is not of correct type\n",cmdline[0]);
            return(DATA_ERROR);
        } else if(infile_info->channels != 1)  {
            sprintf(errstr,"Mono files only\n");
            return(DATA_ERROR);
        } else if((exit_status = copy_parse_info_to_main_structure(infile_info,dz))<0) {
            sprintf(errstr,"Failed to copy file parsing information\n");
            return(PROGRAM_ERROR);
        }
        free(infile_info);
    }
    return(FINISHED);
}

/************************* SETUP_MCHZIG_PARAM_RANGES_AND_DEFAULTS *******************/

int setup_mchzig_param_ranges_and_defaults(dataptr dz)
{
    int exit_status;
    aplptr ap = dz->application;
    // set_param_ranges()
    double duration = (double)dz->insams[0]/(double)dz->infile->srate;

    ap->total_input_param_cnt = (char)(ap->max_param_cnt + ap->option_cnt + ap->variant_param_cnt);
    // NB total_input_param_cnt is > 0 !!!
    if((exit_status = setup_input_param_range_stores(ap->total_input_param_cnt,ap))<0)
        return(FAILED);
    // get_param_ranges()
    ap->lo[MZIG_START]      = 0.0;
    ap->hi[MZIG_START]      = duration - (MZIG_SPLICELEN * MS_TO_SECS);
    ap->default_val[MZIG_START] = 0.0;
    ap->lo[MZIG_END]        = ((MZIG_SPLICELEN * 2) + MZIG_MIN_UNSPLICED) * MS_TO_SECS;
    ap->hi[MZIG_END]        = duration;
    ap->default_val[MZIG_END]  = duration;
    ap->lo[MZIG_DUR]        = duration + FLTERR;
    ap->hi[MZIG_DUR]        = BIG_TIME;
    ap->default_val[MZIG_DUR] = duration * 2.0;
    ap->lo[MZIG_MIN]        = ((MZIG_SPLICELEN * 2) + MZIG_MIN_UNSPLICED) * MS_TO_SECS;
    ap->hi[MZIG_MIN]        = duration - (2 * MZIG_SPLICELEN * MS_TO_SECS);
    ap->default_val[MZIG_MIN] = ((MZIG_SPLICELEN * 2) + MZIG_MIN_UNSPLICED) * MS_TO_SECS;
    ap->lo[MZIG_OCHANS] = 2;
    ap->hi[MZIG_OCHANS] = 16;
    ap->default_val[MZIG_OCHANS]      = 8;
    ap->lo[MZIG_SPLEN]  = MMIN_ZIGSPLICE;
    ap->hi[MZIG_SPLEN]  = MMAX_ZIGSPLICE;
    ap->default_val[MZIG_SPLEN] = MZIG_SPLICELEN;
    if(dz->mode==ZIGZAG_SELF) {
        ap->lo[MZIG_MAX] = ((MZIG_SPLICELEN * 2) + MZIG_MIN_UNSPLICED) * MS_TO_SECS;
        ap->hi[MZIG_MAX] = duration - (2 * MZIG_SPLICELEN * MS_TO_SECS);
        ap->default_val[MZIG_MAX] = min(2.0,duration - (2 * MZIG_SPLICELEN * MS_TO_SECS));
        ap->lo[MZIG_RSEED] = 0.0;
        ap->hi[MZIG_RSEED] = MAXSHORT;
        ap->default_val[MZIG_RSEED] = 0.0;
    }
    if(!sloom)
        put_default_vals_in_all_params(dz);
    return(FINISHED);
}

/********************************* PARSE_SLOOM_DATA *********************************/

int parse_sloom_data(int argc,char *argv[],char ***cmdline,int *cmdlinecnt,dataptr dz)
{
    int exit_status;
    int cnt = 1, infilecnt;
    int filesize, insams, inbrksize;
    double dummy;
    int true_cnt = 0;
    //aplptr ap;

    while(cnt<=PRE_CMDLINE_DATACNT) {
        if(cnt > argc) {
            sprintf(errstr,"Insufficient data sent from TK\n");
            return(DATA_ERROR);
        }
        switch(cnt) {
        case(1):
            if(sscanf(argv[cnt],"%d",&dz->process)!=1) {
                sprintf(errstr,"Cannot read process no. sent from TK\n");
                return(DATA_ERROR);
            }
            break;

        case(2):
            if(sscanf(argv[cnt],"%d",&dz->mode)!=1) {
                sprintf(errstr,"Cannot read mode no. sent from TK\n");
                return(DATA_ERROR);
            }
            if(dz->mode > 0)
                dz->mode--;
            //setup_particular_application() =
            if((exit_status = setup_mchzig_application(dz))<0)
                return(exit_status);
            //ap = dz->application;
            break;

        case(3):
            if(sscanf(argv[cnt],"%d",&infilecnt)!=1) {
                sprintf(errstr,"Cannot read infilecnt sent from TK\n");
                return(DATA_ERROR);
            }
            if(infilecnt < 1) {
                true_cnt = cnt + 1;
                cnt = PRE_CMDLINE_DATACNT;      /* force exit from loop after assign_file_data_storage */
            }
            if((exit_status = assign_file_data_storage(infilecnt,dz))<0)
                return(exit_status);
            break;
        case(INPUT_FILETYPE+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->filetype)!=1) {
                sprintf(errstr,"Cannot read filetype sent from TK (%s)\n",argv[cnt]);
                return(DATA_ERROR);
            }
            break;
        case(INPUT_FILESIZE+4):
            if(sscanf(argv[cnt],"%d",&filesize)!=1) {
                sprintf(errstr,"Cannot read infilesize sent from TK\n");
                return(DATA_ERROR);
            }
            dz->insams[0] = filesize;
            break;
        case(INPUT_INSAMS+4):
            if(sscanf(argv[cnt],"%d",&insams)!=1) {
                sprintf(errstr,"Cannot read insams sent from TK\n");
                return(DATA_ERROR);
            }
            dz->insams[0] = insams;
            break;
        case(INPUT_SRATE+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->srate)!=1) {
                sprintf(errstr,"Cannot read srate sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_CHANNELS+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->channels)!=1) {
                sprintf(errstr,"Cannot read channels sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_STYPE+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->stype)!=1) {
                sprintf(errstr,"Cannot read stype sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_ORIGSTYPE+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->origstype)!=1) {
                sprintf(errstr,"Cannot read origstype sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_ORIGRATE+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->origrate)!=1) {
                sprintf(errstr,"Cannot read origrate sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_MLEN+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->Mlen)!=1) {
                sprintf(errstr,"Cannot read Mlen sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_DFAC+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->Dfac)!=1) {
                sprintf(errstr,"Cannot read Dfac sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_ORIGCHANS+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->origchans)!=1) {
                sprintf(errstr,"Cannot read origchans sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_SPECENVCNT+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->specenvcnt)!=1) {
                sprintf(errstr,"Cannot read specenvcnt sent from TK\n");
                return(DATA_ERROR);
            }
            dz->specenvcnt = dz->infile->specenvcnt;
            break;
        case(INPUT_WANTED+4):
            if(sscanf(argv[cnt],"%d",&dz->wanted)!=1) {
                sprintf(errstr,"Cannot read wanted sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_WLENGTH+4):
            if(sscanf(argv[cnt],"%d",&dz->wlength)!=1) {
                sprintf(errstr,"Cannot read wlength sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_OUT_CHANS+4):
            if(sscanf(argv[cnt],"%d",&dz->out_chans)!=1) {
                sprintf(errstr,"Cannot read out_chans sent from TK\n");
                return(DATA_ERROR);
            }
            break;
            /* RWD these chanegs to samps - tk will have to deal with that! */
        case(INPUT_DESCRIPTOR_BYTES+4):
            if(sscanf(argv[cnt],"%d",&dz->descriptor_samps)!=1) {
                sprintf(errstr,"Cannot read descriptor_samps sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_IS_TRANSPOS+4):
            if(sscanf(argv[cnt],"%d",&dz->is_transpos)!=1) {
                sprintf(errstr,"Cannot read is_transpos sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_COULD_BE_TRANSPOS+4):
            if(sscanf(argv[cnt],"%d",&dz->could_be_transpos)!=1) {
                sprintf(errstr,"Cannot read could_be_transpos sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_COULD_BE_PITCH+4):
            if(sscanf(argv[cnt],"%d",&dz->could_be_pitch)!=1) {
                sprintf(errstr,"Cannot read could_be_pitch sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_DIFFERENT_SRATES+4):
            if(sscanf(argv[cnt],"%d",&dz->different_srates)!=1) {
                sprintf(errstr,"Cannot read different_srates sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_DUPLICATE_SNDS+4):
            if(sscanf(argv[cnt],"%d",&dz->duplicate_snds)!=1) {
                sprintf(errstr,"Cannot read duplicate_snds sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_BRKSIZE+4):
            if(sscanf(argv[cnt],"%d",&inbrksize)!=1) {
                sprintf(errstr,"Cannot read brksize sent from TK\n");
                return(DATA_ERROR);
            }
            if(inbrksize > 0) {
                switch(dz->input_data_type) {
                case(WORDLIST_ONLY):
                    break;
                case(PITCH_AND_PITCH):
                case(PITCH_AND_TRANSPOS):
                case(TRANSPOS_AND_TRANSPOS):
                    dz->tempsize = inbrksize;
                    break;
                case(BRKFILES_ONLY):
                case(UNRANGED_BRKFILE_ONLY):
                case(DB_BRKFILES_ONLY):
                case(ALL_FILES):
                case(ANY_NUMBER_OF_ANY_FILES):
                    if(dz->extrabrkno < 0) {
                        sprintf(errstr,"Storage location number for brktable not established by CDP.\n");
                        return(DATA_ERROR);
                    }
                    if(dz->brksize == NULL) {
                        sprintf(errstr,"CDP has not established storage space for input brktable.\n");
                        return(PROGRAM_ERROR);
                    }
                    dz->brksize[dz->extrabrkno]     = inbrksize;
                    break;
                default:
                    sprintf(errstr,"TK sent brktablesize > 0 for input_data_type [%d] not using brktables.\n",
                            dz->input_data_type);
                    return(PROGRAM_ERROR);
                }
                break;
            }
            break;
        case(INPUT_NUMSIZE+4):
            if(sscanf(argv[cnt],"%d",&dz->numsize)!=1) {
                sprintf(errstr,"Cannot read numsize sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_LINECNT+4):
            if(sscanf(argv[cnt],"%d",&dz->linecnt)!=1) {
                sprintf(errstr,"Cannot read linecnt sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_ALL_WORDS+4):
            if(sscanf(argv[cnt],"%d",&dz->all_words)!=1) {
                sprintf(errstr,"Cannot read all_words sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_ARATE+4):
            if(sscanf(argv[cnt],"%f",&dz->infile->arate)!=1) {
                sprintf(errstr,"Cannot read arate sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_FRAMETIME+4):
            if(sscanf(argv[cnt],"%lf",&dummy)!=1) {
                sprintf(errstr,"Cannot read frametime sent from TK\n");
                return(DATA_ERROR);
            }
            dz->frametime = (float)dummy;
            break;
        case(INPUT_WINDOW_SIZE+4):
            if(sscanf(argv[cnt],"%f",&dz->infile->window_size)!=1) {
                sprintf(errstr,"Cannot read window_size sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_NYQUIST+4):
            if(sscanf(argv[cnt],"%lf",&dz->nyquist)!=1) {
                sprintf(errstr,"Cannot read nyquist sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_DURATION+4):
            if(sscanf(argv[cnt],"%lf",&dz->duration)!=1) {
                sprintf(errstr,"Cannot read duration sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_MINBRK+4):
            if(sscanf(argv[cnt],"%lf",&dz->minbrk)!=1) {
                sprintf(errstr,"Cannot read minbrk sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_MAXBRK+4):
            if(sscanf(argv[cnt],"%lf",&dz->maxbrk)!=1) {
                sprintf(errstr,"Cannot read maxbrk sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_MINNUM+4):
            if(sscanf(argv[cnt],"%lf",&dz->minnum)!=1) {
                sprintf(errstr,"Cannot read minnum sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_MAXNUM+4):
            if(sscanf(argv[cnt],"%lf",&dz->maxnum)!=1) {
                sprintf(errstr,"Cannot read maxnum sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        default:
            sprintf(errstr,"case switch item missing: parse_sloom_data()\n");
            return(PROGRAM_ERROR);
        }
        cnt++;
    }
    if(cnt!=PRE_CMDLINE_DATACNT+1) {
        sprintf(errstr,"Insufficient pre-cmdline params sent from TK\n");
        return(DATA_ERROR);
    }

    if(true_cnt)
        cnt = true_cnt;
    *cmdlinecnt = 0;

    while(cnt < argc) {
        if((exit_status = get_tk_cmdline_word(cmdlinecnt,cmdline,argv[cnt]))<0)
            return(exit_status);
        cnt++;
    }
    return(FINISHED);
}

/********************************* GET_TK_CMDLINE_WORD *********************************/

int get_tk_cmdline_word(int *cmdlinecnt,char ***cmdline,char *q)
{
    if(*cmdlinecnt==0) {
        if((*cmdline = (char **)malloc(sizeof(char *)))==NULL)  {
            sprintf(errstr,"INSUFFICIENT MEMORY for TK cmdline array.\n");
            return(MEMORY_ERROR);
        }
    } else {
        if((*cmdline = (char **)realloc(*cmdline,((*cmdlinecnt)+1) * sizeof(char *)))==NULL)    {
            sprintf(errstr,"INSUFFICIENT MEMORY for TK cmdline array.\n");
            return(MEMORY_ERROR);
        }
    }
    if(((*cmdline)[*cmdlinecnt] = (char *)malloc((strlen(q) + 1) * sizeof(char)))==NULL)    {
        sprintf(errstr,"INSUFFICIENT MEMORY for TK cmdline item %d.\n",(*cmdlinecnt)+1);
        return(MEMORY_ERROR);
    }
    strcpy((*cmdline)[*cmdlinecnt],q);
    (*cmdlinecnt)++;
    return(FINISHED);
}


/****************************** ASSIGN_FILE_DATA_STORAGE *********************************/

int assign_file_data_storage(int infilecnt,dataptr dz)
{
    int exit_status;
    int no_sndfile_system_files = FALSE;
    dz->infilecnt = infilecnt;
    if((exit_status = allocate_filespace(dz))<0)
        return(exit_status);
    if(no_sndfile_system_files)
        dz->infilecnt = 0;
    return(FINISHED);
}



/************************* redundant functions: to ensure libs compile OK *******************/

int assign_process_logic(dataptr dz)
{
    return(FINISHED);
}

void set_legal_infile_structure(dataptr dz)
{}

int establish_bufptrs_and_extra_buffers(dataptr dz)
{
    return(FINISHED);
}

int read_special_data(char *str,dataptr dz)
{
    return(FINISHED);
}

int inner_loop
(int *peakscore,int *descnt,int *in_start_portion,int *least,int *pitchcnt,int windows_in_buf,dataptr dz)
{
    return(FINISHED);
}

int get_process_no(char *prog_identifier_from_cmdline,dataptr dz)
{
    return(FINISHED);
}

int setup_internal_arrays_and_array_pointers(dataptr dz)
{
    return(FINISHED);
}

/******************************** USAGE1 ********************************/

int usage1(void)
{
    usage2("zag");
    return(USAGE_ONLY);
}

/******************************** DBTOLEVEL ***********************/

double dbtolevel(double val)
{
    int isneg = 0;
    if(flteq(val,0.0))
        return(1.0);
    if(val < 0.0) {
        val = -val;
        isneg = 1;
    }
    val /= 20.0;
    val = pow(10.0,val);
    if(isneg)
        val = 1.0/val;
    return(val);
}

/********************************************************************************************/

int get_the_process_no(char *prog_identifier_from_cmdline,dataptr dz)
{
    if(!strcmp(prog_identifier_from_cmdline,"zag"))                         dz->process = MCHZIG;
    else {
        sprintf(errstr,"Unknown program identification string '%s'\n",prog_identifier_from_cmdline);
        return(USAGE_ONLY);
    }
    return(FINISHED);
}

/****************************** GET_MODE *********************************/

int get_the_mode_from_cmdline(char *str,dataptr dz)
{
    if(sscanf(str,"%d",&dz->mode)!=1) {
        sprintf(errstr,"Cannot read mode of program.\n");
        return(USAGE_ONLY);
    }
    if(dz->mode <= 0 || dz->mode > dz->maxmode) {
        sprintf(errstr,"Program mode value [%d] is out of range [1 - %d].\n",dz->mode,dz->maxmode);
        return(USAGE_ONLY);
    }
    dz->mode--;             /* CHANGE TO INTERNAL REPRESENTATION OF MODE NO */
    return(FINISHED);
}

/******************************** SETUP_AND_INIT_INPUT_BRKTABLE_CONSTANTS ********************************/

int setup_and_init_input_brktable_constants(dataptr dz,int brkcnt)
{
    int n;
    if((dz->brk      = (double **)malloc(brkcnt * sizeof(double *)))==NULL) {
        sprintf(errstr,"setup_and_init_input_brktable_constants(): 1\n");
        return(MEMORY_ERROR);
    }
    if((dz->brkptr   = (double **)malloc(brkcnt * sizeof(double *)))==NULL) {
        sprintf(errstr,"setup_and_init_input_brktable_constants(): 6\n");
        return(MEMORY_ERROR);
    }
    if((dz->brksize  = (int    *)malloc(brkcnt * sizeof(int)))==NULL) {
        sprintf(errstr,"setup_and_init_input_brktable_constants(): 2\n");
        return(MEMORY_ERROR);
    }
    if((dz->firstval = (double  *)malloc(brkcnt * sizeof(double)))==NULL) {
        sprintf(errstr,"setup_and_init_input_brktable_constants(): 3\n");
        return(MEMORY_ERROR);
    }
    if((dz->lastind  = (double  *)malloc(brkcnt * sizeof(double)))==NULL) {
        sprintf(errstr,"setup_and_init_input_brktable_constants(): 4\n");
        return(MEMORY_ERROR);
    }
    if((dz->lastval  = (double  *)malloc(brkcnt * sizeof(double)))==NULL) {
        sprintf(errstr,"setup_and_init_input_brktable_constants(): 5\n");
        return(MEMORY_ERROR);
    }
    if((dz->brkinit  = (int     *)malloc(brkcnt * sizeof(int)))==NULL) {
        sprintf(errstr,"setup_and_init_input_brktable_constants(): 7\n");
        return(MEMORY_ERROR);
    }
    for(n=0;n<brkcnt;n++) {
        dz->brk[n]     = NULL;
        dz->brkptr[n]  = NULL;
        dz->brkinit[n] = 0;
        dz->brksize[n] = 0;
    }
    return(FINISHED);
}

/******************************** USAGE2 ********************************/

int usage2(char *str)
{
    if(!strcmp(str,"zag")) {
        fprintf(stderr,
                "USAGE: mchzig zag 1 infile outfile start end dur minzig outchans\n"
                "     [-ssplicelen] [-mmaxzig] [-rseed] [-a]\n"
                "OR:    mchzig zag 2 infile outfile timefile outchans [-ssplicelen] [-a]\n\n"
                "READ SOUNDFILE BACK AND FORTH, PANNING RANDOMLY BETWEEN OUTPUT CHANS\n\n"
                "MODES\n"
                "1: random zigzags: starts at file start, ends at file end.\n"
                "2: zigzagging follows times supplied by user.\n"
                "\n"
                "PARAMETERS\n"
                "start:     together with...\n"
                "end:       define interval in which times zigzag.\n"
                "dur:       is total duration of output sound required.\n"
                "minzig:    is min acceptable time between successive zigzag timepoints.\n"
                "outchans:  number of channels in output file.\n"
                "splicelen: in MILLIsecs (Default 25ms).\n"
                "maxzig:    is max acceptable time between successive zigzag timepoints\n"
                "seed:      number to generate a replicable random sequence. (>0)\n"
                "           entering same number on next program run, generates same sequence.\n"
                "           (Default: (0) random sequence is different every time).\n"
                "timefile:  text file containing sequence of times to zigzag between.\n"
                "           Each step-between-times must be > (3 * splicelen).\n"
                "           zigsteps moving in the same (time-)direction will be concatenated.\n"
                "-a         Avoid zigs between adjacent channels (5 or more outchans only).\n");
    } else
        fprintf(stdout,"Unknown option '%s'\n",str);
    return(USAGE_ONLY);
}

int usage3(char *str1,char *str2)
{
    fprintf(stderr,"Insufficient parameters on command line.\n");
    return(USAGE_ONLY);
}

/********************************** CHECK_ZIGZAG_CONSISTENCY **********************************/

int check_zigzag_consistency(dataptr dz)
{
    double diff;
    if(dz->mode==ZIGZAG_SELF) {
        if(dz->infile->channels != 1) {
            sprintf(errstr,"mchzig only works with mono files.\n");
            return(DATA_ERROR);
        }
        if(dz->param[MZIG_MAX] <= dz->param[MZIG_MIN]) {
            sprintf(errstr,"maximum zig duration <= minimum zig duration\n");
            return(DATA_ERROR);
        }
        if(dz->param[MZIG_MIN] < (((dz->param[MZIG_SPLEN] * 2) + ZIG_MIN_UNSPLICED) * MS_TO_SECS)) {
            sprintf(errstr,"minimum ziglength must be > %.3lf: cannot proceed\n",
                    ((dz->param[MZIG_SPLEN] * 2) + ZIG_MIN_UNSPLICED) * MS_TO_SECS);
            return(DATA_ERROR);
        }
        diff = dz->param[MZIG_END] - dz->param[MZIG_START];
        if(diff<=0.0) {
            sprintf(errstr,"Zig start and end times incompatible.\n");
            return(DATA_ERROR);
        }
        if(round(diff/dz->param[MZIG_MIN])<1) {
            sprintf(errstr,"Zigzagging sector too short for zig-zag minlength specified.\n");
            return(DATA_ERROR);
        }
    }
    if(dz->vflag[0] && (dz->iparam[MZIG_OCHANS] < 5)) {
        sprintf(errstr,"Can't avoid adjacent chans + use all chans, with < 5 outchans.\n");
        return(DATA_ERROR);
    }
    dz->outchans = dz->iparam[MZIG_OCHANS];
    return FINISHED;
}

/********************************** ZIGZAG_PREPROCESS **********************************/

int mzigzag_preprocess(int *maxzig,dataptr dz)
{
    int exit_status;
    int n = 0;
    if(dz->mode==ZIGZAG_SELF)
        initialise_random_sequence(IS_ZIG_RSEED,MZIG_RSEED,dz);
    if((exit_status = setup_zigzag_splice(MZIG_SPLEN,dz))<0)
        return(exit_status);
    if(dz->insams[0] <= dz->iparam[MZIG_SPLSAMPS] * 2) {
        sprintf(errstr,"Infile too short for splices.\n");
        return(DATA_ERROR);
    }
    if(dz->mode == ZIGZAG_SELF) {
        if((exit_status = generate_zigzag_table(dz))<0)
            return(exit_status);
    }
    if((exit_status = sort_zigs(maxzig,dz))<0)
        return(exit_status);

    if(sloom) {
        dz->tempsize = 0L;
        for(n=1;n<dz->itemcnt;n++)
            /*RWD treat tempszie as in samps */
            dz->tempsize += abs(dz->lparray[ZIGZAG_TIMES][n] - dz->lparray[ZIGZAG_TIMES][n-1]);
    }
    if((dz->iparray[MZIG_PERMCH] = (int *)malloc(dz->iparam[MZIG_OCHANS] * sizeof(int)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY to make channel perm array.\n");
        return(MEMORY_ERROR);
    }
    return(FINISHED);
}

/*********************** SETUP_ZIGZAG_SPLICE ***************************/

int setup_zigzag_splice(int paramno,dataptr dz)
{
    int exit_status;
    if((exit_status = make_zigsplice(paramno,dz))<0)
        return(exit_status);
    return create_zigzag_splicebuffer(dz);
}

/*********************** MAKE_ZIGSPLICE ***************************/

int make_zigsplice(int paramno,dataptr dz)
{
    int n;
    dz->iparam[MZIG_SPLICECNT] = (int)round(dz->param[paramno] * MS_TO_SECS * dz->infile->srate);
    dz->iparam[MZIG_SPLSAMPS]  = dz->iparam[MZIG_SPLICECNT];

    if((dz->parray[ZIGZAG_SPLICE] = (double *)malloc(dz->iparam[MZIG_SPLICECNT] * sizeof(double)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY to make splicer buffer.\n");
        return(MEMORY_ERROR);
    }
    for(n=0;n<dz->iparam[MZIG_SPLICECNT];n++)
        dz->parray[ZIGZAG_SPLICE][n] = (double)n/(double)dz->iparam[MZIG_SPLICECNT];
    return(FINISHED);
}

/*********************** CREATE_ZIGZAG_SPLICEBUFFER ***************************/

int create_zigzag_splicebuffer(dataptr dz)
{
    if(dz->extrabuf == (float **)0) {
        sprintf(errstr,"extrabuf has not been created: create_zigzag_splicebuffer()\n");
        return(PROGRAM_ERROR);
    }

    if((dz->extrabuf[ZIGZAG_SPLBUF] = (float *)malloc(sizeof(float) * dz->iparam[MZIG_SPLSAMPS]))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY to make splicing buffer.\n");
        return(MEMORY_ERROR);
    }
    memset((char *)dz->extrabuf[ZIGZAG_SPLBUF],0,sizeof(float) * dz->iparam[MZIG_SPLSAMPS]);
    return(FINISHED);
}

/***************************** GENERATE_ZIGZAG_TABLE ***************************/

int generate_zigzag_table(dataptr dz)
{
    int    OK;
    int   arraysize = BIGARRAY;
    double infiledur = (double)(dz->insams[0]/dz->infile->channels)/(double)(dz->infile->srate);
    double totaltime = dz->param[MZIG_START];
    double goaltime  = dz->param[MZIG_DUR] - (infiledur - dz->param[MZIG_END]);
    double diff, randlen = 0.0, here  = dz->param[MZIG_START];
    int direction = FORWARDS;
    if((dz->lparray[ZIGZAG_TIMES] = (int *)malloc(arraysize * sizeof(int)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY to store times.\n");
        return(MEMORY_ERROR);
    }
    dz->lparray[ZIGZAG_TIMES][0] = 0;
    dz->itemcnt = 1;
    do {
        OK = TRUE;
        switch(direction) {
        case(FORWARDS):
            diff = min(dz->param[MZIG_MAX],dz->param[MZIG_END] - here);
            if(diff<=dz->param[MZIG_MIN])
                OK = FALSE;
            else {
                randlen = drand48();                                            /* generate segment length at random */
                randlen *= (diff - dz->param[MZIG_MIN]);        /* scale it to range required */
                randlen += dz->param[MZIG_MIN];                         /* and add mindur */
                here = (here + randlen);
            }
            break;
        case(BACKWARDS):
            diff = min(dz->param[MZIG_MAX],here - dz->param[MZIG_START]);
            if(diff<=dz->param[MZIG_MIN])
                OK = FALSE;
            else {
                randlen = drand48();                                            /* generate segment length at random */
                randlen *= (diff - dz->param[MZIG_MIN]);        /* scale it to range required */
                randlen += dz->param[MZIG_MIN];                 /* and add mindur */
                here = (here - randlen);
            }
            break;
        }
        direction = -direction; /* invert time-direction */
        if(!OK)
            continue;
        totaltime += randlen;
        dz->lparray[ZIGZAG_TIMES][dz->itemcnt] = round(here * (double)dz->infile->srate) * dz->infile->channels;
        if(++dz->itemcnt >= arraysize) {
            arraysize += BIGARRAY;
            if((dz->lparray[ZIGZAG_TIMES] =
                (int *)realloc((char *)dz->lparray[ZIGZAG_TIMES],arraysize*sizeof(int)))==NULL) {
                sprintf(errstr,"INSUFFICIENT MEMORY to reallocate times store.\n");
                return(MEMORY_ERROR);
            }
        }
    } while(totaltime<goaltime);
    dz->lparray[ZIGZAG_TIMES][dz->itemcnt] = dz->insams[0];
    dz->itemcnt++;
    if(dz->itemcnt < arraysize) {
        if((dz->lparray[ZIGZAG_TIMES] =
            (int *)realloc((char *)dz->lparray[ZIGZAG_TIMES],dz->itemcnt*sizeof(int)))==NULL) {
            sprintf(errstr,"INSUFFICIENT MEMORY to reallocate times store.\n");
            return(MEMORY_ERROR);
        }
    }
    return(FINISHED);
}

/****************************** SORT_ZIGS ************************************/

int sort_zigs(int *maxzig,dataptr dz)
{
    int exit_status;
    int zigsize;
    int safety = round(ZIG_MIN_UNSPLICED * MS_TO_SECS * (double)dz->infile->srate) * dz->infile->channels;
    int cnt = 0, firstime = TRUE, direction, previous_direction = FORWARDS;
    int *this_zigtime = dz->lparray[ZIGZAG_TIMES];
    int *next_zigtime = dz->lparray[ZIGZAG_TIMES] + 1;
    int *ziglistend = dz->lparray[ZIGZAG_TIMES] + dz->itemcnt;
    int minzig = (dz->iparam[MZIG_SPLSAMPS] * 2) + safety;
    int file_samplen = dz->insams[0];
    double convert_to_time = 1.0/(double)dz->infile->channels/(double)dz->infile->srate;
    if(*this_zigtime < 0 || *this_zigtime > file_samplen) {
        sprintf(errstr,"Invalid 1st zigtime %lf\n",(*this_zigtime) * convert_to_time);
        return(DATA_ERROR);
    }
    if(*(ziglistend-1) >= file_samplen) {
        *(ziglistend-1) = file_samplen;
        dz->iparam[ZIG_RUNSTOEND] = 1;
    } else
        dz->iparam[ZIG_RUNSTOEND] = 0;
    while(next_zigtime < ziglistend - dz->iparam[ZIG_RUNSTOEND]) {
        if(*next_zigtime < 0 || *next_zigtime > file_samplen) {
            sprintf(errstr,"Invalid zigtime %lf\n",(*next_zigtime) * convert_to_time);
            return(DATA_ERROR);
        }
        while((zigsize = abs(*next_zigtime - *this_zigtime)) < minzig) {
            if(++next_zigtime == ziglistend - dz->iparam[ZIG_RUNSTOEND])
                break;
        }
        if(next_zigtime - this_zigtime > 1) {
            if(dz->mode == ZIGZAG_USER) {
                sprintf(errstr,"Some zigs too short to use with specified splicelen.\n");
                return(DATA_ERROR);
            }
            eliminate_n_steps(this_zigtime,next_zigtime,&ziglistend,&cnt,dz);
            next_zigtime = this_zigtime + 1;
        }
        if(*next_zigtime > *this_zigtime)
            direction = FORWARDS;
        else
            direction = BACKWARDS;
        if(!firstime && (direction == previous_direction)) {
            if((exit_status = eliminate_step(next_zigtime,&ziglistend,&cnt,dz))<0)
                return(exit_status);
            continue;
        }
        previous_direction = direction;
        firstime = FALSE;
        this_zigtime++;
        next_zigtime++;
    }
    if(cnt>0) {
        fprintf(stdout,"WARNING: %d steps eliminated (too small relative to spliclength\n",cnt);
        //TW : CAN'T SPLIT LINES SENT TO SLOOM - 'WARNING' is a flag to SLOOM - possibly my error, since updated
        fprintf(stdout,"WARNING: or moving in same direction as previous step)\n");
        fflush(stdout);
        if((dz->lparray[ZIGZAG_TIMES] =
            (int *)realloc((char *)dz->lparray[ZIGZAG_TIMES],dz->itemcnt * sizeof(int)))==NULL) {
            sprintf(errstr,"INSUFFICIENT MEMORY to reallocate times store.\n");
            return(MEMORY_ERROR);
        }
    }
    if(dz->iparam[ZIG_RUNSTOEND]) {
        if(*(ziglistend-1) - *(ziglistend-2) < dz->iparam[MZIG_SPLSAMPS] + safety) {
            sprintf(errstr,"Final zig too short for splicelen.\n");
            return(GOAL_FAILED);
        }
    }
    get_bufsize_needed(maxzig,dz);
    return FINISHED;
}

/**************************** ELIMINATE_N_STEPS ***************************/

int eliminate_n_steps(int *this_zigtime,int *next_zigtime,int **ziglistend,int *cnt,dataptr dz)
{
    int *here  = this_zigtime + 1;
    int *there = next_zigtime;
    int elimination_cnt = next_zigtime - this_zigtime - 1;
    while(there < *ziglistend) {
        *here = *there;
        here++;
        there++;
    }
    if((dz->itemcnt -= elimination_cnt) < 2) {
        sprintf(errstr,"All zigsteps either too small for splices: or moving in same direction.\n");
        return(DATA_ERROR);
    }
    *ziglistend -= elimination_cnt;
    (*cnt) += elimination_cnt;
    return(FINISHED);
}

/***************************** ELIMINATE_STEP ***************************/

int eliminate_step(int *next_zigtime,int **ziglistend,int *cnt,dataptr dz)
{
    int *here = next_zigtime;

    while(here < *ziglistend) {
        *(here-1) = *here;
        here++;
    }
    if(--dz->itemcnt < 2) {
        sprintf(errstr,"All zigsteps either too small for splices: or moving in same direction.\n");
        return(DATA_ERROR);
    }
    (*ziglistend)--;
    (*cnt)++;
    return(FINISHED);
}

/***************************** INSERT_EXTRA_ZIG ***************************/

int insert_extra_zig(int direction,int **this_zigtime,int **next_zigtime,int **ziglistend,int len,dataptr dz)
{
    int *here;
    int zthis = *this_zigtime - dz->lparray[ZIGZAG_TIMES];
    int znext = *next_zigtime - dz->lparray[ZIGZAG_TIMES];
    dz->itemcnt++;
    if((dz->lparray[ZIGZAG_TIMES] =
        (int *)realloc((char *)dz->lparray[ZIGZAG_TIMES],dz->itemcnt * sizeof(int)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY to reallocate times store.\n");
        return(MEMORY_ERROR);
    }
    *this_zigtime = dz->lparray[ZIGZAG_TIMES] + zthis;
    *next_zigtime = dz->lparray[ZIGZAG_TIMES] + znext;
    *ziglistend  =  dz->lparray[ZIGZAG_TIMES] + dz->itemcnt;
    here = *ziglistend - 1;
    while(here > *next_zigtime) {
        *here = *(here-1);
        here--;
    }
    switch(direction) {
    case(FORWARDS):
        *here = **this_zigtime + len;
        break;
    case(BACKWARDS):
        *here = **this_zigtime - len;
        break;
    }
    if(*here < 0.0 || (int)*here > dz->insams[0]) {
        sprintf(errstr,"Error in logic of sample arithmetic: insert_extra_zig()\n");
        return(PROGRAM_ERROR);
    }
    return(FINISHED);
}

/**************************** GET_BUFSIZE_NEEDED ***************************/

void get_bufsize_needed(int *maxzig,dataptr dz)
{
    int *zigtime = dz->lparray[ZIGZAG_TIMES], n, ziglen;
    *maxzig = 0;
    for(n = 1; n < dz->itemcnt;n++) {
        ziglen = abs(zigtime[n] - zigtime[n-1]);
        if(ziglen > *maxzig)
            *maxzig = ziglen;
    }
}

/***************************** ZIGZAG **********************************/

int zigzag(dataptr dz)
{
    int exit_status;
    int *perm = dz->iparray[MZIG_PERMCH];
    int *thisstart, *lastend = dz->lparray[ZIGZAG_TIMES], minsamp;
    int permno, chancnt = dz->iparam[MZIG_OCHANS],startchan,endchan;
    int *ziglistend = dz->lparray[ZIGZAG_TIMES] + dz->itemcnt;
    int outbuf_space = dz->buflen, samps_left;
    int obufno, obufendno;
    obufno = 2;                                     //      The last chancnt bufs are the multichan outbuf
    obufendno = 2 + chancnt;        //      which starts at dz->sampbuf[2];
    //      dz->sampbuf[2+chancnt] marks the outbuf end
    thisstart = lastend;
    thisstart++;
    if((exit_status = find_zzchunk(thisstart,ziglistend,&minsamp,dz))!=CONTINUE) {
        if(exit_status == FINISHED)
            exit_status = GOAL_FAILED;
        sprintf(errstr,"WARNING: No valid zigzag found\n");
        return(exit_status);
    }
    lastend = thisstart;
    thisstart++;
    if(sndseekEx(dz->ifd[0],minsamp,0)<0) {
        sprintf(errstr,"Seek Anomaly 1()\n");
        return(PROGRAM_ERROR);
    }
    if((exit_status = read_samps(dz->sampbuf[0],dz))<0)
        return(exit_status);
    endchan = -1;
    do {
        permute_chans(chancnt,dz);
    } while(adjacence(endchan,dz));
    startchan = perm[0];
    endchan   = perm[1];
    permno = 2;
    while(thisstart < ziglistend-1) {
        if((exit_status = zig_or_zag(thisstart,lastend,&outbuf_space,obufno,obufendno,startchan,endchan,dz))<0)
            return(exit_status);
        startchan = endchan;
        endchan = perm[permno];
        permno++;
        if(permno >= dz->iparam[MZIG_OCHANS]) {
            do {
                permute_chans(dz->iparam[MZIG_OCHANS],dz);
            } while((perm[0] == endchan) || adjacence(endchan,dz));
            permno = 0;
        }
        if((exit_status = find_zzchunk(thisstart,ziglistend,&minsamp,dz))!=CONTINUE) {
            if(exit_status==FINISHED)
                break;
            else
                return(exit_status);
        }
        if(sndseekEx(dz->ifd[0],minsamp,0)<0) {
            sprintf(errstr,"Seek Anomaly 2()\n");
            return(PROGRAM_ERROR);
        }
        if((exit_status = read_samps(dz->sampbuf[0],dz))<0)
            return(exit_status);
        lastend = thisstart;
        thisstart++;
    }
    samps_left = dz->sbufptr[obufno] - dz->sampbuf[obufno];
    if(samps_left > 0)
        return write_samps(dz->sampbuf[obufno],samps_left,dz);
    return FINISHED;
}

/************************* DO_ZIGZAGS ************************************/

int zig_or_zag(int *thisstart,int *lastend,int *outbuf_space,int obufno,int obufendno,int startchan,int endchan,dataptr dz)
{
    int exit_status;
    int *here  = thisstart;
    int *next  = thisstart + 1;
    int  chancnt = dz->iparam[MZIG_OCHANS];
    int incnt  = abs(*next - *here);
    float *write_limit;
    int wraplen = dz->iparam[MZIG_SPLICECNT] * chancnt;
    if(*here < *next) {
        // direction = ZIG;
        memcpy((char *)dz->sampbuf[1],(char *)dz->sampbuf[0],incnt * sizeof(float));
    } else {
        //direction = ZAG;
        if((exit_status = reverse_it(incnt,dz))<0)
            return(exit_status);
    }
    do_start_splice(dz->sampbuf[1],dz);
    do_end_splice(dz->sampbuf[1],incnt,dz);
    write_limit = dz->sampbuf[obufendno] + wraplen; //      Allows for wrap-around-area at end of obuf
    if((exit_status = copy_with_spatial_scatter(dz->sbufptr[obufno],write_limit,startchan,endchan,incnt,chancnt,dz))<0)
        return(exit_status);
    dz->sbufptr[obufno] -= wraplen;
    return(FINISHED);
}

/*************************** FIND_ZZCHUNK ************************************/

int find_zzchunk(int *thisstart,int *ziglistend, int *minsamp, dataptr dz)
{
    int *p, min_samp, max_samp;
    p = thisstart;
    /* WE'RE SEARCHING FOR THE earliest and latest times among successive zigtimes */
    min_samp = *p;                                                          /* so preset both of these to the current first zigtime */
    max_samp = *p;
    p++;
    if(p == ziglistend)
        return FINISHED;
    if(*p < min_samp)                                               /* if this zigtime earlier than any encountered so far */
        min_samp = *p;
    else if(*p > max_samp)                                  /* if this zigtime later than any encountered so far */
        max_samp = *p;
    if(max_samp - min_samp < 0) {
        sprintf(errstr,"Anomaly in find_zzchunk()\n");
        return(PROGRAM_ERROR);
    }
    *minsamp = min_samp;
    return(CONTINUE);
}

/********************** REVERSE_IT ***************************/

int reverse_it(int incnt,dataptr dz)
{
    int n;
    float *s0ptr = dz->sampbuf[0] + incnt - 1;
    float *s1ptr = dz->sampbuf[1];
    for(n=0;n<incnt;n++)
        *s1ptr++ = *s0ptr--;
    return(FINISHED);
}

/********************** COPY_WITH_SPATIAL_SCATTER ***************************/

int copy_with_spatial_scatter(float *outptr,float *tobufend,int startchan,int endchan,int sampcnt,int chancnt,dataptr dz)
{
    int exit_status;
    int panpos, n;
    double pos, leftgain, rightgain;
    int outchans = dz->iparam[MZIG_OCHANS];
    int obufsamps = dz->buflen * chancnt;                                    //     Samples in a full outbuffer
    int  wrapsamps = dz->iparam[MZIG_SPLICECNT] * outchans; //      Samples in wraparound seg after obufend
    float *toptr = outptr;                                                                   // Location of next write in obuffer
    float *fromptr = dz->sampbuf[1];                                                 // Location of first read in input buffer
    float *obuf_wrap = dz->sampbuf[2 + outchans];                    //     Start of wrap-around segment
    if(sampcnt < 0) {
        sprintf(errstr,"Attempted to copy -ve number of samps: copy_with_spatial_scatter()\n");
        return(PROGRAM_ERROR);
    }
    panpos = 0;
    for(n = 0;n<sampcnt;n++) {
        if(toptr >= tobufend) {
            if((exit_status = write_samps(dz->sampbuf[2],obufsamps,dz))<0)
                return exit_status;
            memset((char *)dz->sampbuf[2],0,obufsamps * sizeof(float));                                     // clear the outbuf,
            memcpy((char *)dz->sampbuf[2],(char *)obuf_wrap,wrapsamps * sizeof(float)); // wrap_around any buffer overflow,
            memset((char *)obuf_wrap,0,wrapsamps * sizeof(float));                                          // THEN clear the wrap-around segment.
            toptr -= obufsamps;                                                                                                                     // Baktrak output pointer by a full buflen.
        }
        pos = (double)panpos/(double)sampcnt;   //      Fraction of time-distance into zig
        pos = (pos * 2.0) - 1.0;                                //      Change to -1 to + 1 frame
        pancalc(pos,&leftgain,&rightgain);
        toptr[startchan] = (float)(toptr[startchan] + (fromptr[n] * leftgain));
        toptr[endchan]   = (float)(toptr[endchan]   + (fromptr[n] * rightgain));
        toptr += outchans;
        panpos++;
    }
    dz->sbufptr[2] = toptr;
    return FINISHED;
}

/********************** DO_START_SPLICE ***************************/

void do_start_splice(float *buf,dataptr dz)
{
    int  n;
    for(n=0;n < dz->iparam[MZIG_SPLICECNT];n++)
        buf[n] = (float)(buf[n] * dz->parray[ZIGZAG_SPLICE][n]);
}

/********************** DO_END_SPLICE ***************************/

void do_end_splice(float *buf,int incnt,dataptr dz)
{
    int  n, m;
    int splicecnt = dz->iparam[MZIG_SPLICECNT];
    buf += incnt - splicecnt;
    for(n=0,m = splicecnt - 1;n < splicecnt;n++,m--)
        buf[n] = (float)(buf[n] * dz->parray[ZIGZAG_SPLICE][m]);
}

/*************************** PERMUTE_CHANS ***************************/

void permute_chans(int outchans,dataptr dz)
{
    int n, t;
    for(n=0;n<outchans;n++) {
        t = (int)(drand48() * (double)(n+1));    /* TRUNCATE */
        if(t==n)
            prefixch(n,outchans,dz);
        else
            insertch(n,t,outchans,dz);
    }
}

/****************************** INSERTCH ****************************/

void insertch(int n,int t,int outchans,dataptr dz)
{
    shuflupch(t+1,outchans,dz);
    dz->iparray[MZIG_PERMCH][t+1] = n;
}

/****************************** PREFIX ****************************/

void prefixch(int n,int outchans,dataptr dz)
{
    shuflupch(0,outchans,dz);
    dz->iparray[MZIG_PERMCH][0] = n;
}

/****************************** SHUFLUPCH ****************************/

void shuflupch(int k,int outchans,dataptr dz)
{
    int n;
    for(n = outchans - 1; n > k; n--)
        dz->iparray[MZIG_PERMCH][n] = dz->iparray[MZIG_PERMCH][n-1];
}

/***************************** SETUP_INTERNAL_ARRAYS_AND_ARRAY_POINTERS **************************/

int mz_setup_internal_arrays_and_array_pointers(dataptr dz)
{
    int n;
    dz->array_cnt = 1;
    dz->iarray_cnt = 1;
    dz->larray_cnt = 1;
    if((dz->parray  = (double **)malloc(dz->array_cnt * sizeof(double *)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY for internal double arrays.\n");
        return(MEMORY_ERROR);
    }
    for(n=0;n<dz->array_cnt;n++)
        dz->parray[n] = NULL;

    if((dz->iparray = (int     **)malloc(dz->iarray_cnt * sizeof(int *)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY for internal int arrays.\n");
        return(MEMORY_ERROR);
    }
    for(n=0;n<dz->iarray_cnt;n++)
        dz->iparray[n] = NULL;

    if((dz->lparray = (int    **)malloc(dz->larray_cnt * sizeof(int *)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY for internal long arrays.\n");
        return(MEMORY_ERROR);
    }
    for(n=0;n<dz->larray_cnt;n++)
        dz->lparray[n] = NULL;

    return(FINISHED);
}

/************************************ PANCALC *******************************/

void pancalc(double position,double *leftgain,double *rightgain)
{
    int signal_to_left = 0;
    double temp;
    double relpos;
    double reldist, invsquare;

    if(position < 0.0)
        signal_to_left = 1;             /* signal on left */

    if(position < 0)
        relpos = -position;
    else
        relpos = position;
    if(relpos <= 1.0){              /* between the speakers */
        temp = 1.0 + (relpos * relpos);
        reldist = ROOT2 / sqrt(temp);
        temp = (position + 1.0) / 2.0;
        *rightgain = temp * reldist;
        *leftgain = (1.0 - temp ) * reldist;
    } else {                                /* outside the speakers */
        temp = (relpos * relpos) + 1.0;
        reldist  = sqrt(temp) / ROOT2;   /* relative distance to source */
        invsquare = 1.0 / (reldist * reldist);
        if(signal_to_left){
            *leftgain = invsquare;
            *rightgain = 0.0;
        } else {   /* SIGNAL_TO_RIGHT */
            *rightgain = invsquare;
            *leftgain = 0;
        }
    }
}

/************************ HANDLE_THE_SPECIAL_DATA *********************/

int handle_the_special_data(int *cmdlinecnt,char ***cmdline,dataptr dz)
{
    int exit_status;
    aplptr ap = dz->application;

    if(ap->special_data) {
        if(!sloom) {
            if(*cmdlinecnt <= 0) {
                sprintf(errstr,"Insufficient parameters on command line.\n");
                return(USAGE_ONLY);
            }
        }
        if((exit_status = setup_the_special_data_ranges
            (dz->mode,dz->infile->srate,dz->duration,dz->nyquist,dz->wlength,dz->infile->channels,ap))<0)
            return(exit_status);

        if((exit_status = read_ziginfo((*cmdline)[0],dz))<0)
            return(exit_status);
        (*cmdline)++;
        (*cmdlinecnt)--;
    }
    return(FINISHED);
}


/************************ SETUP_SPECIAL_DATA_RANGES *********************/

int setup_the_special_data_ranges(int mode,int srate,double duration,double nyquist,int wlength,int channels,aplptr ap)
{
    ap->data_in_file_only   = TRUE;
    ap->special_range               = TRUE;
    ap->min_special                 = MZIG_SPLICELEN * MS_TO_SECS * 3;
    ap->max_special                 = duration;
    return(FINISHED);
}

/***************************** READ_ZIGINFO ***************************/

int read_ziginfo(char *filename,dataptr dz)
{
    FILE   *fp;
    double  p;
    char  temp[200], *q;
    int  arraysize = BIGARRAY, sampcnt;
    int maxlong = /*getmaxlong()*/0x7fffffff;
    dz->itemcnt = 0;
    if((fp = fopen(filename,"r"))==NULL) {
        sprintf(errstr,"Can't open text file %s to read.\n",filename);
        return(DATA_ERROR);
    }
    if((dz->lparray[ZIGZAG_TIMES] = (int *)malloc(arraysize * sizeof(int)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY to store zigzag times.\n");
        return(MEMORY_ERROR);
    }
    while(fgets(temp,200,fp)!=NULL) {
        q = temp;
        while(get_float_from_within_string(&q,&p)){
            if(p < 0.0) {
                sprintf(errstr,"Invalid zigzag time, less than zero\n");
                return(DATA_ERROR);
            }
            if((sampcnt = round(p * (double)dz->infile->srate) * dz->infile->channels) < 0) /* overflow */
                dz->lparray[ZIGZAG_TIMES][dz->itemcnt] = (maxlong/dz->infile->channels) * dz->infile->channels;
            else
                dz->lparray[ZIGZAG_TIMES][dz->itemcnt] = sampcnt;
            if(++dz->itemcnt >= arraysize) {
                arraysize += BIGARRAY;
                if((dz->lparray[ZIGZAG_TIMES] =
                    (int *)realloc((char *)dz->lparray[ZIGZAG_TIMES],arraysize*sizeof(int)))==NULL) {
                    sprintf(errstr,"INSUFFICIENT MEMORY to reallocate zigzag times.\n");
                    return(MEMORY_ERROR);
                }
            }
        }
    }
    if(!dz->itemcnt) {
        sprintf(errstr,"No data in file %s\n",filename);
        return(DATA_ERROR);
    }
    if((dz->lparray[ZIGZAG_TIMES] =
        (int *)realloc((char *)dz->lparray[ZIGZAG_TIMES],dz->itemcnt * sizeof(int)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY to reallocate zigzag times.\n");
        return(MEMORY_ERROR);
    }
    if(fclose(fp)<0) {
        fprintf(stdout,"WARNING: Failed to close input textfile %s.\n",filename);
        fflush(stdout);
    }
    if(dz->itemcnt < 2) {
        sprintf(errstr,"Not enough zig information found in file %s\n",filename);
        return(DATA_ERROR);
    }
    return(FINISHED);
}

int set_legal_internalparam_structure(int process,int mode,aplptr ap)
{
    int exit_status;
    switch(mode) {
    case(0): exit_status = set_internalparam_data("iii"  ,ap);      break;
    case(1): exit_status = set_internalparam_data("diiii",ap);      break;
    default:
        sprintf(errstr,"Unknown mode for zigzag: set_legal_internalparam_structure()\n");
        return(PROGRAM_ERROR);
    }
    return(exit_status);
}

/*************************** CREATE_MZIG_SNDBUFS **************************/

/* 2009 MULTICHANNEL */

int create_mzig_sndbufs(int maxzig,dataptr dz)
{
    int n;
    int bigbufsize, totalbufsize;
    int safety = 20;
    int outchans = dz->iparam[MZIG_OCHANS];
    int wraplen = dz->iparam[MZIG_SPLICECNT] * outchans;
    //framesize = F_SECSIZE * dz->infile->channels;
    if(dz->sbufptr == 0 || dz->sampbuf==0) {
        sprintf(errstr,"buffer pointers not allocated: create_sndbufs()\n");
        return(PROGRAM_ERROR);
    }
    bigbufsize = ((maxzig + safety)* dz->bufcnt) * sizeof(float);
    if(bigbufsize <= 0) {
        sprintf(errstr,"maximum zig too large for available moeory\n");
        return(DATA_ERROR);
    }
    bigbufsize /= dz->bufcnt;
    dz->buflen = bigbufsize / sizeof(float);
    totalbufsize = (bigbufsize  * dz->bufcnt);
    totalbufsize += (wraplen * sizeof(float)) + safety;                                             //      NB This creates a splicelen(+) segment of buffer beyond outbuf end
    if((dz->bigbuf = (float *)malloc(totalbufsize)) == NULL) {                              //      Which is used to wrap-around samples, into outbuf, at write_samps
        sprintf(errstr,"INSUFFICIENT MEMORY to create sound buffers.\n");       //      This is needed because there is a splicelen backtrack
        return(PROGRAM_ERROR);                                                                                          //      before every zig write to the outbuf.
    }
    for(n=0;n<dz->bufcnt;n++)
        dz->sbufptr[n] = dz->sampbuf[n] = dz->bigbuf + (dz->buflen * n);
    dz->sampbuf[n] = dz->bigbuf + (dz->buflen * n);
    return(FINISHED);
}

/*************************** ADJACENCE **************************/

int adjacence(int endchan,dataptr dz)
{
    int *perm = dz->iparray[MZIG_PERMCH];
    int i, j, ochans = dz->iparam[MZIG_OCHANS];
    int lastchan = ochans - 1;
    if(dz->vflag[0] == 0)
        return 0;
    if(endchan >= 0) {
        if ((perm[0] == 0) && (endchan == lastchan))
            return 1;
        else if((endchan == 0) && (perm[0] == lastchan))
            return 1;
        else if(perm[0] - endchan == 1)
            return 1;
        else if(endchan - perm[0] == 1)
            return 1;
    }
    for(i=0;i < ochans;i++) {
        j = (i + 1) % ochans;
        if ((perm[i] == 0) && (perm[j] == lastchan))
            return 1;
        else if((perm[j] == 0) && (perm[i] == lastchan))
            return 1;
        else if(perm[j] - perm[i] == 1)
            return 1;
        else if(perm[i] - perm[j] == 1)
            return 1;
    }
    return 0;
}