/***********************************************************
    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;
            }
        }
    }
}