dist/zlib/inffast.c

74     unsigned op;                /* code bits, operation, extra bits, or */
112         op = (unsigned)(here->bits);
113         hold >>= op;
114         bits -= op;
115         op = (unsigned)(here->op);
116         if (op == 0) {                          /* literal */
122         else if (op & 16) {                     /* length base */
124             op &= 15;                           /* number of extra bits */
125             if (op) {
126                 if (bits < op) {
130                 len += (unsigned)hold & ((1U << op) - 1);
131                 hold >>= op;
132                 bits -= op;
143             op = (unsigned)(here->bits);
144             hold >>= op;
145             bits -= op;
146             op = (unsigned)(here->op);
147             if (op & 16) {                      /* distance base */
149                 op &= 15;                       /* number of extra bits */
150                 if (bits < op) {
153                     if (bits < op) {
158                 dist += (unsigned)hold & ((1U << op) - 1);
166                 hold >>= op;
167                 bits -= op;
169                 op = (unsigned)(out - beg);     /* max distance in output */
170                 if (dist > op) {                /* see if copy from window */
171                     op = dist - op;             /* distance back in window */
172                     if (op > whave) {
180                         if (len <= op - whave) {
186                         len -= op - whave;
189                         } while (--op > whave);
190                         if (op == 0) {
201                         from += wsize - op;
202                         if (op < len) {         /* some from window */
203                             len -= op;
206                             } while (--op);
210                     else if (wnext < op) {      /* wrap around window */
211                         from += wsize + wnext - op;
212                         op -= wnext;
213                         if (op < len) {         /* some from end of window */
214                             len -= op;
217                             } while (--op);
220                                 op = wnext;
221                                 len -= op;
224                                 } while (--op);
230                         from += wnext - op;
231                         if (op < len) {         /* some from window */
232                             len -= op;
235                             } while (--op);
266             else if ((op & 64) == 0) {          /* 2nd level distance code */
267                 here = dcode + here->val + (hold & ((1U << op) - 1));
276         else if ((op & 64) == 0) {              /* 2nd level length code */
277             here = lcode + here->val + (hold & ((1U << op) - 1));
280         else if (op & 32) {                     /* end-of-block */
312    - Different op definition to avoid & for extra bits (do & for table bits)