/***********************************************************
        decode.c
***********************************************************/
#include "ar.h"

static int j;  /* remaining bytes to copy */

void decode_start(void)
{
        huf_decode_start();
        j = 0;
}

void decode(uint count, uchar buffer[])
        /* The calling function must keep the number of
           bytes to be processed.  This function decodes
           either 'count' bytes or 'DICSIZ' bytes, whichever
           is smaller, into the array 'buffer[]' of size
           'DICSIZ' or more.
           Call decode_start() once for each new file
           before calling this function. */
{
        static uint i;
        uint r, c;

        r = 0;
        while (--j >= 0) {
                buffer[r] = buffer[i];
                i = (i + 1) & (DICSIZ - 1);
                if (++r == count) return;
        }
        for ( ; ; ) {
                c = decode_c();
                if (c <= UCHAR_MAX) {
                        buffer[r] = c;
                        if (++r == count) return;
                } else {
                        j = c - (UCHAR_MAX + 1 - THRESHOLD);
                        i = (r - decode_p() - 1) & (DICSIZ - 1);
                        while (--j >= 0) {
                                buffer[r] = buffer[i];
                                i = (i + 1) & (DICSIZ - 1);
                                if (++r == count) return;
                        }
                }
        }
}
