zlib-53/zlib/inffast.c

96     unsigned op;                /* code bits, operation, extra bits, or */
134         op = (unsigned)(here.bits);
135         hold >>= op;
136         bits -= op;
137         op = (unsigned)(here.op);
138         if (op == 0) {                          /* literal */
144         else if (op & 16) {                     /* length base */
146             op &= 15;                           /* number of extra bits */
147             if (op) {
148                 if (bits < op) {
152                 len += (unsigned)hold & ((1U << op) - 1);
153                 hold >>= op;
154                 bits -= op;
165             op = (unsigned)(here.bits);
166             hold >>= op;
167             bits -= op;
168             op = (unsigned)(here.op);
169             if (op & 16) {                      /* distance base */
171                 op &= 15;                       /* number of extra bits */
172                 if (bits < op) {
175                     if (bits < op) {
180                 dist += (unsigned)hold & ((1U << op) - 1);
188                 hold >>= op;
189                 bits -= op;
191                 op = (unsigned)(out - beg);     /* max distance in output */
192                 if (dist > op) {                /* see if copy from window */
193                     op = dist - op;             /* distance back in window */
194                     if (op > whave) {
202                         if (len <= op - whave) {
208                         len -= op - whave;
211                         } while (--op > whave);
212                         if (op == 0) {
223                         from += wsize - op;
224                         if (op < len) {         /* some from window */
225                             len -= op;
228                             } while (--op);
232                     else if (wnext < op) {      /* wrap around window */
233                         from += wsize + wnext - op;
234                         op -= wnext;
235                         if (op < len) {         /* some from end of window */
236                             len -= op;
239                             } while (--op);
242                                 op = wnext;
243                                 len -= op;
246                                 } while (--op);
252                         from += wnext - op;
253                         if (op < len) {         /* some from window */
254                             len -= op;
257                             } while (--op);
288             else if ((op & 64) == 0) {          /* 2nd level distance code */
289                 here = dcode[here.val + (hold & ((1U << op) - 1))];
298         else if ((op & 64) == 0) {              /* 2nd level length code */
299             here = lcode[here.val + (hold & ((1U << op) - 1))];
302         else if (op & 32) {                     /* end-of-block */
334    - Different op definition to avoid & for extra bits (do & for table bits)