block_compress
static int block_compress = BLOCK_MASK;
free_ent = ((block_compress) ? FIRST : 256 );
if ( (code == CLEAR) && block_compress ) {
block_compress = maxbits & BLOCK_MASK;
tmp = (u_char)(maxbits | block_compress);
free_ent = ((block_compress) ? FIRST : 256);
checkpoint && block_compress) {
block_compress = maxbits & BLOCK_MASK;
free_ent = block_compress ? FIRST : 256;
if ((code == CLEAR) && block_compress) {
block_compress = BLOCK_MASK;