#include <stdlib.h>
#include <stdio.h>
#include "wv.h"

void wvFreeXst(Xst **xst)
	{
	Xst *freegroup;
	if ((xst == NULL) || (*xst == NULL))
		return;

	while (*xst != NULL)
        {
        freegroup = *xst;
        *xst = (*xst)->next;
        if (freegroup->u16string != NULL)
            free(freegroup->u16string);
        free(freegroup);
        }
	}

void wvGetXst(Xst **xst,U32 offset,U32 len,wvStream *fd)
    {
    U16 clen,i;
    U32 count=0;
    Xst *authorlist;
    Xst *current=NULL;

    if ((len == 0) || (xst == NULL))
        {
        *xst = NULL;
        return;
        }

    wvStream_goto(fd,offset);
    *xst = (Xst*) malloc(sizeof(Xst));
    authorlist = *xst;

    if (authorlist == NULL)
        {
        wvError(("not enough mem for annotation group\n"));
        return;
        }

    authorlist->next = NULL;
    authorlist->u16string = NULL;
    authorlist->noofstrings=0;
    current = authorlist;

    while (count < len)
        {
        clen = read_16ubit(fd);
        count+=2;
        current->u16string = (U16 *)malloc((clen+1) * sizeof(U16));
        authorlist->noofstrings++;
        if (current->u16string == NULL)
            {
            wvError(("not enough mem for author string of clen %d\n",clen));
            break;
            }
        for (i=0;i<clen;i++)
            {
            current->u16string[i] = read_16ubit(fd);
            count+=2;
            }
        current->u16string[i] = '\0';

        if (count < len)
            {
            current->next= (Xst*) malloc(sizeof(Xst));
            if (current->next == NULL)
                {
                wvError(("not enough mem for annotation group\n"));
                break;
                }
            current = current->next;
            current->next = NULL;
            current->u16string = NULL;
            }
        }
    }