unsigned int zipStorePrevEntryLength(unsigned char *p, unsigned int len) {
    if (p == NULL) {
        return (len < ZIP_BIG_PREVLEN) ? 1 : sizeof(len)+1;
    } else {
        if (len < ZIP_BIG_PREVLEN) {
            p[0] = len;
            return 1;
        } else {
            return zipStorePrevEntryLengthLarge(p,len);
        }
    }
}
unsigned int zipStorePrevEntryLength(unsigned char *p, unsigned int len) {
    if (p == NULL) {
        return (len < ZIP_BIG_PREVLEN) ? 1 : sizeof(len)+1;
    } else {
        if (len < ZIP_BIG_PREVLEN) {
            p[0] = len;
            return 1;
        } else {
            return zipStorePrevEntryLengthLarge(p,len);
        }
    }
}