zlib-55/zlib/inflate.c

11  *   creation of window when not needed, minimize use of window when it is
32  * - Fix bug in reuse of allocated window after inflateReset()
45  * - Rearrange window copies in inflate_fast() for speed and simplification
46  * - Unroll last copy for window match in inflate_fast()
47  * - Use local copies of window variables in inflate_fast() for speed
54  *   programs like gzip and unzip -- uses window as output buffer to avoid
55  *   window copying
67  * - Changed type of window in inflateBackInit() to unsigned char *
154     /* set number of window bits, free window if different */
157     if (state->window != Z_NULL && state->wbits != (unsigned)windowBits) {
158         ZFREE(strm, state->window);
159         state->window = Z_NULL;
192     state->window = Z_NULL;
345    Update the window with the last wsize (normally 32K) bytes written before
346    returning.  If window does not exist yet, create it.  This is only called
347    when a window is already in use, or when output has been written during this
349    It is also called to create a window for dictionary data when a dictionary
353    advantage, since only the last 32K of output is copied to the sliding window
367     /* if it hasn't been done already, allocate space for the window */
368     if (state->window == Z_NULL) {
369         state->window = (unsigned char FAR *)
372         if (state->window == Z_NULL) return 1;
375     /* if window not in use yet, initialize */
382     /* copy state->wsize or less output bytes into the circular window */
385         zmemcpy(state->window, strm->next_out - state->wsize, state->wsize);
392         zmemcpy(state->window + state->wnext, strm->next_out - copy, dist);
395             zmemcpy(state->window, strm->next_out - copy, copy);
573    When there is a window, goto inf_leave will update the window with the last
575    and there is no window currently, goto inf_leave will create one and copy
576    output to the window for the next call of inflate().
582    the allocation of and copying into a sliding window until necessary, which
660                 strm->msg = (char *)"invalid window size";
1111             if (state->offset > copy) {         /* copy from window */
1135                     from = state->window + (state->wsize - copy);
1138                     from = state->window + (state->wnext - copy);
1212        error.  Call updatewindow() to create and/or update the window state.
1245     if (state->window != Z_NULL) ZFREE(strm, state->window);
1274     /* copy dictionary to window */
1280         zmemcpy(state->window, dictionary + dictLength - state->wsize,
1285         zmemcpy(state->window + state->wsize - dictLength, dictionary,
1412     unsigned char FAR *window;
1425     window = Z_NULL;
1426     if (state->window != Z_NULL) {
1427         window = (unsigned char FAR *)
1429         if (window == Z_NULL) {
1444     if (window != Z_NULL) {
1446         zmemcpy(window, state->window, wsize);
1448     copy->window = window;