lib/libz/inffast.c

71     unsigned op;                /* code bits, operation, extra bits, or */
109         op = (unsigned)(here->bits);
110         hold >>= op;
111         bits -= op;
112         op = (unsigned)(here->op);
113         if (op == 0) {                          /* literal */
119         else if (op & 16) {                     /* length base */
121             op &= 15;                           /* number of extra bits */
122             if (op) {
123                 if (bits < op) {
127                 len += (unsigned)hold & ((1U << op) - 1);
128                 hold >>= op;
129                 bits -= op;
140             op = (unsigned)(here->bits);
141             hold >>= op;
142             bits -= op;
143             op = (unsigned)(here->op);
144             if (op & 16) {                      /* distance base */
146                 op &= 15;                       /* number of extra bits */
147                 if (bits < op) {
150                     if (bits < op) {
155                 dist += (unsigned)hold & ((1U << op) - 1);
163                 hold >>= op;
164                 bits -= op;
166                 op = (unsigned)(out - beg);     /* max distance in output */
167                 if (dist > op) {                /* see if copy from window */
168                     op = dist - op;             /* distance back in window */
169                     if (op > whave) {
181                         if (len <= op - whave) {
187                         len -= op - whave;
190                         } while (--op > whave);
191                         if (op == 0) {
202                         from += wsize - op;
203                         if (op < len) {         /* some from window */
204                             len -= op;
207                             } while (--op);
211                     else if (wnext < op) {      /* wrap around window */
212                         from += wsize + wnext - op;
213                         op -= wnext;
214                         if (op < len) {         /* some from end of window */
215                             len -= op;
218                             } while (--op);
221                                 op = wnext;
222                                 len -= op;
225                                 } while (--op);
231                         from += wnext - op;
232                         if (op < len) {         /* some from window */
233                             len -= op;
236                             } while (--op);
267             else if ((op & 64) == 0) {          /* 2nd level distance code */
268                 here = dcode + here->val + (hold & ((1U << op) - 1));
281         else if ((op & 64) == 0) {              /* 2nd level length code */
282             here = lcode + here->val + (hold & ((1U << op) - 1));
285         else if (op & 32) {                     /* end-of-block */
321    - Different op definition to avoid & for extra bits (do & for table bits)