ref: 8f09eb5ce0260aa17f93b2ccefb4bae347ca79fc
dir: /src/gzip/infutil.c/
/* inflate_util.c -- data and routines common to blocks and codes * Copyright (C) 1995-2002 Mark Adler * For conditions of distribution and use, see copyright notice in zlib.h */ #include "zutil.h" #include "infblock.h" #include "inftrees.h" #include "infcodes.h" #include "infutil.h" /* And'ing with mask[n] masks the lower n bits */ local const uInt inflate_mask[17] = { 0x0000, 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff, 0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff }; /* copy as much as possible from the sliding window to the output area */ local int inflate_flush( /* s, z, r) */ inflate_blocks_statef *s, z_streamp z, int r ) { uInt n; Bytef *p; Bytef *q; /* local copies of source and destination pointers */ p = z->next_out; q = s->read; /* compute number of bytes to copy as far as end of window */ n = (uInt)((q <= s->write ? s->write : s->end) - q); if (n > z->avail_out) n = z->avail_out; if (n && r == Z_BUF_ERROR) r = Z_OK; /* update counters */ z->avail_out -= n; z->total_out += n; /* update check information */ if (s->checkfn != Z_NULL) z->adler = s->check = (*s->checkfn)(s->check, q, n); /* copy as far as end of window */ zmemcpy(p, q, n); p += n; q += n; /* see if more to copy at beginning of window */ if (q == s->end) { /* wrap pointers */ q = s->window; if (s->write == s->end) s->write = s->window; /* compute bytes to copy */ n = (uInt)(s->write - q); if (n > z->avail_out) n = z->avail_out; if (n && r == Z_BUF_ERROR) r = Z_OK; /* update counters */ z->avail_out -= n; z->total_out += n; /* update check information */ if (s->checkfn != Z_NULL) z->adler = s->check = (*s->checkfn)(s->check, q, n); /* copy */ zmemcpy(p, q, n); p += n; q += n; } /* update pointers */ z->next_out = p; s->read = q; /* done */ return r; }