internal int SetDictionary(byte[] dictionary)
{
int num = dictionary.Length;
int sourceIndex = 0;
if (dictionary == null || this.status != DeflateManager.INIT_STATE)
{
throw new ZlibException("Stream error.");
}
this._codec._Adler32 = Adler.Adler32(this._codec._Adler32, dictionary, 0, dictionary.Length);
if (num < DeflateManager.MIN_MATCH)
{
return(0);
}
if (num > this.w_size - DeflateManager.MIN_LOOKAHEAD)
{
num = this.w_size - DeflateManager.MIN_LOOKAHEAD;
sourceIndex = dictionary.Length - num;
}
Array.Copy(dictionary, sourceIndex, this.window, 0, num);
this.strstart = num;
this.block_start = num;
this.ins_h = (int)(this.window[0] & 255);
this.ins_h = ((this.ins_h << this.hash_shift ^ (int)(this.window[1] & 255)) & this.hash_mask);
for (int i = 0; i <= num - DeflateManager.MIN_MATCH; i++)
{
this.ins_h = ((this.ins_h << this.hash_shift ^ (int)(this.window[i + (DeflateManager.MIN_MATCH - 1)] & 255)) & this.hash_mask);
this.prev[i & this.w_mask] = this.head[this.ins_h];
this.head[this.ins_h] = (short)i;
}
return(0);
}
internal int Flush(int r)
{
for (int i = 0; i < 2; i++)
{
int num;
if (i == 0)
{
num = ((this.readAt > this.writeAt) ? this.end : this.writeAt) - this.readAt;
}
else
{
num = this.writeAt - this.readAt;
}
if (num == 0)
{
if (r == -5)
{
r = 0;
}
return(r);
}
if (num > this._codec.AvailableBytesOut)
{
num = this._codec.AvailableBytesOut;
}
if (num != 0 && r == -5)
{
r = 0;
}
this._codec.AvailableBytesOut -= num;
this._codec.TotalBytesOut += (long)num;
if (this.checkfn != null)
{
this._codec._Adler32 = (this.check = Adler.Adler32(this.check, this.window, this.readAt, num));
}
Array.Copy(this.window, this.readAt, this._codec.OutputBuffer, this._codec.NextOut, num);
this._codec.NextOut += num;
this.readAt += num;
if (this.readAt == this.end && i == 0)
{
this.readAt = 0;
if (this.writeAt == this.end)
{
this.writeAt = 0;
}
}
else
{
i++;
}
}
return(r);
}
internal void Reset()
{
this._codec.TotalBytesIn = (this._codec.TotalBytesOut = 0L);
this._codec.Message = null;
this.pendingCount = 0;
this.nextPending = 0;
this.Rfc1950BytesEmitted = false;
this.status = ((!this.WantRfc1950HeaderBytes) ? DeflateManager.BUSY_STATE : DeflateManager.INIT_STATE);
this._codec._Adler32 = Adler.Adler32(0u, null, 0, 0);
this.last_flush = 0;
this._InitializeTreeData();
this._InitializeLazyMatch();
}
internal uint Reset()
{
uint result = this.check;
this.mode = InflateBlocks.InflateBlockMode.TYPE;
this.bitk = 0;
this.bitb = 0;
this.readAt = (this.writeAt = 0);
if (this.checkfn != null)
{
this._codec._Adler32 = (this.check = Adler.Adler32(0u, null, 0, 0));
}
return(result);
}
internal int read_buf(byte[] buf, int start, int size)
{
int num = this.AvailableBytesIn;
if (num > size)
{
num = size;
}
if (num == 0)
{
return(0);
}
this.AvailableBytesIn -= num;
if (this.dstate.WantRfc1950HeaderBytes)
{
this._Adler32 = Adler.Adler32(this._Adler32, this.InputBuffer, this.NextIn, num);
}
Array.Copy(this.InputBuffer, this.NextIn, buf, start, num);
this.NextIn += num;
this.TotalBytesIn += (long)num;
return(num);
}
internal int SetDictionary(byte[] dictionary)
{
int start = 0;
int num = dictionary.Length;
if (this.mode != InflateManager.InflateManagerMode.DICT0)
{
throw new ZlibException("Stream error.");
}
if (Adler.Adler32(1u, dictionary, 0, dictionary.Length) != this._codec._Adler32)
{
return(-3);
}
this._codec._Adler32 = Adler.Adler32(0u, null, 0, 0);
if (num >= 1 << this.wbits)
{
num = (1 << this.wbits) - 1;
start = dictionary.Length - num;
}
this.blocks.SetDictionary(dictionary, start, num);
this.mode = InflateManager.InflateManagerMode.BLOCKS;
return(0);
}
// Read a new buffer from the current input stream, update the adler32
// and total number of bytes read. All deflate() input goes through
// this function so some applications may wish to modify it to avoid
// allocating a large strm->next_in buffer and copying from it.
// (See also flush_pending()).
internal int read_buf(byte[] buf, int start, int size)
{
int len = AvailableBytesIn;
if (len > size)
{
len = size;
}
if (len == 0)
{
return(0);
}
AvailableBytesIn -= len;
if (dstate.WantRfc1950HeaderBytes)
{
_Adler32 = Adler.Adler32(_Adler32, InputBuffer, NextIn, len);
}
Array.Copy(InputBuffer, NextIn, buf, start, len);
NextIn += len;
TotalBytesIn += len;
return(len);
}
internal int Deflate(FlushType flush)
{
if (this._codec.OutputBuffer == null || (this._codec.InputBuffer == null && this._codec.AvailableBytesIn != 0) || (this.status == DeflateManager.FINISH_STATE && flush != FlushType.Finish))
{
this._codec.Message = DeflateManager._ErrorMessage[4];
throw new ZlibException(string.Format("Something is fishy. [{0}]", this._codec.Message));
}
if (this._codec.AvailableBytesOut == 0)
{
this._codec.Message = DeflateManager._ErrorMessage[7];
throw new ZlibException("OutputBuffer is full (AvailableBytesOut == 0)");
}
int num = this.last_flush;
this.last_flush = (int)flush;
if (this.status == DeflateManager.INIT_STATE)
{
int num2 = DeflateManager.Z_DEFLATED + (this.w_bits - 8 << 4) << 8;
int num3 = (this.compressionLevel - CompressionLevel.BestSpeed & 255) >> 1;
if (num3 > 3)
{
num3 = 3;
}
num2 |= num3 << 6;
if (this.strstart != 0)
{
num2 |= DeflateManager.PRESET_DICT;
}
num2 += 31 - num2 % 31;
this.status = DeflateManager.BUSY_STATE;
this.pending[this.pendingCount++] = (byte)(num2 >> 8);
this.pending[this.pendingCount++] = (byte)num2;
if (this.strstart != 0)
{
this.pending[this.pendingCount++] = (byte)((this._codec._Adler32 & 4278190080u) >> 24);
this.pending[this.pendingCount++] = (byte)((this._codec._Adler32 & 16711680u) >> 16);
this.pending[this.pendingCount++] = (byte)((this._codec._Adler32 & 65280u) >> 8);
this.pending[this.pendingCount++] = (byte)(this._codec._Adler32 & 255u);
}
this._codec._Adler32 = Adler.Adler32(0u, null, 0, 0);
}
if (this.pendingCount != 0)
{
this._codec.flush_pending();
if (this._codec.AvailableBytesOut == 0)
{
this.last_flush = -1;
return(0);
}
}
else if (this._codec.AvailableBytesIn == 0 && flush <= (FlushType)num && flush != FlushType.Finish)
{
return(0);
}
if (this.status == DeflateManager.FINISH_STATE && this._codec.AvailableBytesIn != 0)
{
this._codec.Message = DeflateManager._ErrorMessage[7];
throw new ZlibException("status == FINISH_STATE && _codec.AvailableBytesIn != 0");
}
if (this._codec.AvailableBytesIn != 0 || this.lookahead != 0 || (flush != FlushType.None && this.status != DeflateManager.FINISH_STATE))
{
BlockState blockState = this.DeflateFunction(flush);
if (blockState == BlockState.FinishStarted || blockState == BlockState.FinishDone)
{
this.status = DeflateManager.FINISH_STATE;
}
if (blockState == BlockState.NeedMore || blockState == BlockState.FinishStarted)
{
if (this._codec.AvailableBytesOut == 0)
{
this.last_flush = -1;
}
return(0);
}
if (blockState == BlockState.BlockDone)
{
if (flush == FlushType.Partial)
{
this._tr_align();
}
else
{
this._tr_stored_block(0, 0, false);
if (flush == FlushType.Full)
{
for (int i = 0; i < this.hash_size; i++)
{
this.head[i] = 0;
}
}
}
this._codec.flush_pending();
if (this._codec.AvailableBytesOut == 0)
{
this.last_flush = -1;
return(0);
}
}
}
if (flush != FlushType.Finish)
{
return(0);
}
if (!this.WantRfc1950HeaderBytes || this.Rfc1950BytesEmitted)
{
return(1);
}
this.pending[this.pendingCount++] = (byte)((this._codec._Adler32 & 4278190080u) >> 24);
this.pending[this.pendingCount++] = (byte)((this._codec._Adler32 & 16711680u) >> 16);
this.pending[this.pendingCount++] = (byte)((this._codec._Adler32 & 65280u) >> 8);
this.pending[this.pendingCount++] = (byte)(this._codec._Adler32 & 255u);
this._codec.flush_pending();
this.Rfc1950BytesEmitted = true;
return((this.pendingCount == 0) ? 1 : 0);
}
