public int inflateInit(ZStream z, int w)
{
z.msg = null;
blocks = null;
nowrap = 0;
if (w < 0)
{
w = -w;
nowrap = 1;
}
if (w < 8 || w > 15)
{
inflateEnd(z);
return(Z_STREAM_ERROR);
}
wbits = w;
z.istate.blocks = new InfBlocks(z,
z.istate.nowrap != 0 ? null : this,
1 << w);
inflateReset(z);
return(Z_OK);
}
public int inflateEnd(ZStream z)
{
if (blocks != null)
{
blocks.free(z);
}
blocks = null;
return(Z_OK);
}
public int proc(InfBlocks s, ZStream z, int r)
{
int j;
int tindex;
int e;
int b = 0;
int k = 0;
int p = 0;
int n;
int q;
int m;
int f;
p = z.next_in_index; n = z.avail_in; b = s.bitb; k = s.bitk;
q = s.write; m = q < s.read?s.read - q - 1:s.end - q;
while (true)
{
switch (mode)
{
case START:
if (m >= 258 && n >= 10)
{
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
r = inflate_fast(lbits, dbits,
ltree, ltree_index,
dtree, dtree_index,
s, z);
p = z.next_in_index; n = z.avail_in; b = s.bitb; k = s.bitk;
q = s.write; m = q < s.read?s.read - q - 1:s.end - q;
if (r != Z_OK)
{
mode = r == Z_STREAM_END ? WASH : BADCODE;
break;
}
}
need = lbits;
tree = ltree;
tree_index = ltree_index;
mode = LEN;
goto case LEN;
case LEN:
j = need;
while (k < (j))
{
if (n != 0)
{
r = Z_OK;
}
else
{
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return(s.inflate_flush(z, r));
}
n--;
b |= (z.next_in[p++] & 0xff) << k;
k += 8;
}
tindex = (tree_index + (b & inflate_mask[j])) * 3;
b >>= (tree[tindex + 1]);
k -= (tree[tindex + 1]);
e = tree[tindex];
if (e == 0)
{
lit = tree[tindex + 2];
mode = LIT;
break;
}
if ((e & 16) != 0)
{
get = e & 15;
len = tree[tindex + 2];
mode = LENEXT;
break;
}
if ((e & 64) == 0)
{
need = e;
tree_index = tindex / 3 + tree[tindex + 2];
break;
}
if ((e & 32) != 0)
{
mode = WASH;
break;
}
mode = BADCODE;
z.msg = "invalid literal/length code";
r = Z_DATA_ERROR;
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return(s.inflate_flush(z, r));
case LENEXT:
j = get;
while (k < (j))
{
if (n != 0)
{
r = Z_OK;
}
else
{
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return(s.inflate_flush(z, r));
}
n--; b |= (z.next_in[p++] & 0xff) << k;
k += 8;
}
len += (b & inflate_mask[j]);
b >>= j;
k -= j;
need = dbits;
tree = dtree;
tree_index = dtree_index;
mode = DIST;
goto case DIST;
case DIST:
j = need;
while (k < (j))
{
if (n != 0)
{
r = Z_OK;
}
else
{
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return(s.inflate_flush(z, r));
}
n--; b |= (z.next_in[p++] & 0xff) << k;
k += 8;
}
tindex = (tree_index + (b & inflate_mask[j])) * 3;
b >>= tree[tindex + 1];
k -= tree[tindex + 1];
e = (tree[tindex]);
if ((e & 16) != 0)
{
get = e & 15;
dist = tree[tindex + 2];
mode = DISTEXT;
break;
}
if ((e & 64) == 0)
{
need = e;
tree_index = tindex / 3 + tree[tindex + 2];
break;
}
mode = BADCODE;
z.msg = "invalid distance code";
r = Z_DATA_ERROR;
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return(s.inflate_flush(z, r));
case DISTEXT:
j = get;
while (k < (j))
{
if (n != 0)
{
r = Z_OK;
}
else
{
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return(s.inflate_flush(z, r));
}
n--; b |= (z.next_in[p++] & 0xff) << k;
k += 8;
}
dist += (b & inflate_mask[j]);
b >>= j;
k -= j;
mode = COPY;
goto case COPY;
case COPY:
f = q - dist;
while (f < 0)
{
f += s.end;
}
while (len != 0)
{
if (m == 0)
{
if (q == s.end && s.read != 0)
{
q = 0; m = q < s.read?s.read - q - 1:s.end - q;
}
if (m == 0)
{
s.write = q; r = s.inflate_flush(z, r);
q = s.write; m = q < s.read?s.read - q - 1:s.end - q;
if (q == s.end && s.read != 0)
{
q = 0; m = q < s.read?s.read - q - 1:s.end - q;
}
if (m == 0)
{
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return(s.inflate_flush(z, r));
}
}
}
s.window[q++] = s.window[f++]; m--;
if (f == s.end)
{
f = 0;
}
len--;
}
mode = START;
break;
case LIT:
if (m == 0)
{
if (q == s.end && s.read != 0)
{
q = 0; m = q < s.read?s.read - q - 1:s.end - q;
}
if (m == 0)
{
s.write = q; r = s.inflate_flush(z, r);
q = s.write; m = q < s.read?s.read - q - 1:s.end - q;
if (q == s.end && s.read != 0)
{
q = 0; m = q < s.read?s.read - q - 1:s.end - q;
}
if (m == 0)
{
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return(s.inflate_flush(z, r));
}
}
}
r = Z_OK;
s.window[q++] = (byte)lit; m--;
mode = START;
break;
case WASH:
if (k > 7)
{
k -= 8;
n++;
p--;
}
s.write = q; r = s.inflate_flush(z, r);
q = s.write; m = q < s.read?s.read - q - 1:s.end - q;
if (s.read != s.write)
{
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return(s.inflate_flush(z, r));
}
mode = END;
goto case END;
case END:
r = Z_STREAM_END;
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return(s.inflate_flush(z, r));
case BADCODE:
r = Z_DATA_ERROR;
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return(s.inflate_flush(z, r));
default:
r = Z_STREAM_ERROR;
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return(s.inflate_flush(z, r));
}
}
}
public int inflate_fast(int bl, int bd,
int[] tl, int tl_index,
int[] td, int td_index,
InfBlocks s, ZStream z)
{
int t;
int[] tp;
int tp_index;
int e;
int b;
int k;
int p;
int n;
int q;
int m;
int ml;
int md;
int c;
int d;
int r;
int tp_index_t_3;
p = z.next_in_index; n = z.avail_in; b = s.bitb; k = s.bitk;
q = s.write; m = q < s.read?s.read - q - 1:s.end - q;
ml = inflate_mask[bl];
md = inflate_mask[bd];
do
{
while (k < (20))
{
n--;
b |= (z.next_in[p++] & 0xff) << k; k += 8;
}
t = b & ml;
tp = tl;
tp_index = tl_index;
tp_index_t_3 = (tp_index + t) * 3;
if ((e = tp[tp_index_t_3]) == 0)
{
b >>= (tp[tp_index_t_3 + 1]); k -= (tp[tp_index_t_3 + 1]);
s.window[q++] = (byte)tp[tp_index_t_3 + 2];
m--;
continue;
}
do
{
b >>= (tp[tp_index_t_3 + 1]); k -= (tp[tp_index_t_3 + 1]);
if ((e & 16) != 0)
{
e &= 15;
c = tp[tp_index_t_3 + 2] + ((int)b & inflate_mask[e]);
b >>= e; k -= e;
while (k < (15))
{
n--;
b |= (z.next_in[p++] & 0xff) << k; k += 8;
}
t = b & md;
tp = td;
tp_index = td_index;
tp_index_t_3 = (tp_index + t) * 3;
e = tp[tp_index_t_3];
do
{
b >>= (tp[tp_index_t_3 + 1]); k -= (tp[tp_index_t_3 + 1]);
if ((e & 16) != 0)
{
e &= 15;
while (k < (e))
{
n--;
b |= (z.next_in[p++] & 0xff) << k; k += 8;
}
d = tp[tp_index_t_3 + 2] + (b & inflate_mask[e]);
b >>= (e); k -= (e);
m -= c;
if (q >= d)
{
r = q - d;
if (q - r > 0 && 2 > (q - r))
{
s.window[q++] = s.window[r++];
s.window[q++] = s.window[r++];
c -= 2;
}
else
{
System.Array.Copy(s.window, r, s.window, q, 2);
q += 2; r += 2; c -= 2;
}
}
else
{
r = q - d;
do
{
r += s.end;
}while(r < 0);
e = s.end - r;
if (c > e)
{
c -= e;
if (q - r > 0 && e > (q - r))
{
do
{
s.window[q++] = s.window[r++];
}while(--e != 0);
}
else
{
System.Array.Copy(s.window, r, s.window, q, e);
q += e; r += e; e = 0;
}
r = 0;
}
}
if (q - r > 0 && c > (q - r))
{
do
{
s.window[q++] = s.window[r++];
}while(--c != 0);
}
else
{
System.Array.Copy(s.window, r, s.window, q, c);
q += c; r += c; c = 0;
}
break;
}
else if ((e & 64) == 0)
{
t += tp[tp_index_t_3 + 2];
t += (b & inflate_mask[e]);
tp_index_t_3 = (tp_index + t) * 3;
e = tp[tp_index_t_3];
}
else
{
z.msg = "invalid distance code";
c = z.avail_in - n; c = (k >> 3) < c?k >> 3:c; n += c; p -= c; k -= c << 3;
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return(Z_DATA_ERROR);
}
}while(true);
break;
}
if ((e & 64) == 0)
{
t += tp[tp_index_t_3 + 2];
t += (b & inflate_mask[e]);
tp_index_t_3 = (tp_index + t) * 3;
if ((e = tp[tp_index_t_3]) == 0)
{
b >>= (tp[tp_index_t_3 + 1]); k -= (tp[tp_index_t_3 + 1]);
s.window[q++] = (byte)tp[tp_index_t_3 + 2];
m--;
break;
}
}
else if ((e & 32) != 0)
{
c = z.avail_in - n; c = (k >> 3) < c?k >> 3:c; n += c; p -= c; k -= c << 3;
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return(Z_STREAM_END);
}
else
{
z.msg = "invalid literal/length code";
c = z.avail_in - n; c = (k >> 3) < c?k >> 3:c; n += c; p -= c; k -= c << 3;
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return(Z_DATA_ERROR);
}
}while(true);
}while(m >= 258 && n >= 10);
c = z.avail_in - n; c = (k >> 3) < c?k >> 3:c; n += c; p -= c; k -= c << 3;
s.bitb = b; s.bitk = k;
z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
s.write = q;
return(Z_OK);
}
