internal int inflate(ZStream z, int f)
{
int r;
int b;
if (z == null || z.istate == null || z.next_in == null)
return Z_STREAM_ERROR;
f = f == Z_FINISH?Z_BUF_ERROR:Z_OK;
r = Z_BUF_ERROR;
while (true)
{
//System.out.println("mode: "+z.istate.mode);
switch (z.istate.mode)
{
case METHOD:
if (z.avail_in == 0)
return r; r = f;
z.avail_in--; z.total_in++;
if (((z.istate.method = z.next_in[z.next_in_index++]) & 0xf) != Z_DEFLATED)
{
z.istate.mode = BAD;
z.msg = "unknown compression method";
z.istate.marker = 5; // can't try inflateSync
break;
}
if ((z.istate.method >> 4) + 8 > z.istate.wbits)
{
z.istate.mode = BAD;
z.msg = "invalid window size";
z.istate.marker = 5; // can't try inflateSync
break;
}
z.istate.mode = FLAG;
goto case FLAG;
case FLAG:
if (z.avail_in == 0)
return r; r = f;
z.avail_in--; z.total_in++;
b = (z.next_in[z.next_in_index++]) & 0xff;
if ((((z.istate.method << 8) + b) % 31) != 0)
{
z.istate.mode = BAD;
z.msg = "incorrect header check";
z.istate.marker = 5; // can't try inflateSync
break;
}
if ((b & PRESET_DICT) == 0)
{
z.istate.mode = BLOCKS;
break;
}
z.istate.mode = DICT4;
goto case DICT4;
case DICT4:
if (z.avail_in == 0)
return r; r = f;
z.avail_in--; z.total_in++;
z.istate.need = ((z.next_in[z.next_in_index++] & 0xff) << 24) & unchecked((int) 0xff000000L);
z.istate.mode = DICT3;
goto case DICT3;
case DICT3:
if (z.avail_in == 0)
return r; r = f;
z.avail_in--; z.total_in++;
z.istate.need += (((z.next_in[z.next_in_index++] & 0xff) << 16) & 0xff0000L);
z.istate.mode = DICT2;
goto case DICT2;
case DICT2:
if (z.avail_in == 0)
return r; r = f;
z.avail_in--; z.total_in++;
z.istate.need += (((z.next_in[z.next_in_index++] & 0xff) << 8) & 0xff00L);
z.istate.mode = DICT1;
goto case DICT1;
case DICT1:
if (z.avail_in == 0)
return r; r = f;
z.avail_in--; z.total_in++;
z.istate.need += (z.next_in[z.next_in_index++] & 0xffL);
z.adler = z.istate.need;
z.istate.mode = DICT0;
return Z_NEED_DICT;
case DICT0:
z.istate.mode = BAD;
z.msg = "need dictionary";
z.istate.marker = 0; // can try inflateSync
return Z_STREAM_ERROR;
case BLOCKS:
r = z.istate.blocks.proc(z, r);
if (r == Z_DATA_ERROR)
{
z.istate.mode = BAD;
z.istate.marker = 0; // can try inflateSync
break;
}
if (r == Z_OK)
{
r = f;
}
if (r != Z_STREAM_END)
{
return r;
}
r = f;
z.istate.blocks.reset(z, z.istate.was);
if (z.istate.nowrap != 0)
{
z.istate.mode = DONE;
break;
}
z.istate.mode = CHECK4;
goto case CHECK4;
case CHECK4:
if (z.avail_in == 0)
return r; r = f;
z.avail_in--; z.total_in++;
z.istate.need = ((z.next_in[z.next_in_index++] & 0xff) << 24) & unchecked((int) 0xff000000L);
z.istate.mode = CHECK3;
goto case CHECK3;
case CHECK3:
if (z.avail_in == 0)
return r; r = f;
z.avail_in--; z.total_in++;
z.istate.need += (((z.next_in[z.next_in_index++] & 0xff) << 16) & 0xff0000L);
z.istate.mode = CHECK2;
goto case CHECK2;
case CHECK2:
if (z.avail_in == 0)
return r; r = f;
z.avail_in--; z.total_in++;
z.istate.need += (((z.next_in[z.next_in_index++] & 0xff) << 8) & 0xff00L);
z.istate.mode = CHECK1;
goto case CHECK1;
case CHECK1:
if (z.avail_in == 0)
return r; r = f;
z.avail_in--; z.total_in++;
z.istate.need += (z.next_in[z.next_in_index++] & 0xffL);
if (((int) (z.istate.was[0])) != ((int) (z.istate.need)))
{
z.istate.mode = BAD;
z.msg = "incorrect data check";
z.istate.marker = 5; // can't try inflateSync
break;
}
z.istate.mode = DONE;
goto case DONE;
case DONE:
return Z_STREAM_END;
case BAD:
throw new ApplicationException("Compression / Decompression Failed");
//return Z_DATA_ERROR;
default:
return Z_STREAM_ERROR;
}
}
}
