Mercurial > hg > ucis.core
annotate Util/PrebufferingStream.cs @ 49:7e4dae99f919
USBLib: fix unhandled exception in WinUSB shutdown after failure to open device
| author | Ivo Smits <Ivo@UCIS.nl> |
|---|---|
| date | Mon, 19 Aug 2013 16:56:50 +0200 |
| parents | 2e3f57f326b3 |
| children |
| rev | line source |
|---|---|
| 5 | 1 ???using System; |
| 2 using System.Collections.Generic; | |
| 3 using System.Text; | |
| 4 using System.IO; | |
| 5 using System.Threading; | |
| 6 | |
| 7 namespace UCIS.Util { | |
| 8 public class PrebufferingStream : Stream { | |
| 9 class AsyncResult : AsyncResultBase { | |
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10 public Byte[] Buffer { get; set; } |
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11 public int Offset { get; set; } |
| 5 | 12 public int Left { get; set; } |
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13 public int Count { get; set; } |
| 5 | 14 public AsyncResult(AsyncCallback callback, Object state) : base(callback, state) { } |
| 15 public void SetCompleted(Boolean synchronously, int count, Exception error) { | |
| 16 this.Count = count; | |
| 17 base.SetCompleted(synchronously, error); | |
| 18 } | |
| 37 | 19 public new void SetCompleted(Boolean synchronously, Exception error) { |
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20 base.SetCompleted(synchronously, error); |
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21 } |
| 5 | 22 public int WaitForCompletion() { |
| 23 WaitHandle wh = null; | |
| 24 lock (this) if (!IsCompleted) wh = AsyncWaitHandle; | |
| 25 if (wh != null) wh.WaitOne(); | |
| 26 ThrowError(); | |
| 27 return Count; | |
| 28 } | |
| 29 } | |
| 30 | |
| 31 Stream baseStream; | |
| 32 Byte[] prebuffer = null; | |
| 33 int prebufferoffset = 0; | |
| 34 int prebuffercount = 0; | |
| 35 int defaultbuffersize; | |
| 36 | |
| 37 public Stream BaseStream { get { return baseStream; } } | |
| 38 | |
| 39 public PrebufferingStream(Stream stream) : this(stream, 1024) { } | |
| 40 public PrebufferingStream(Stream stream, int bufferSize) { | |
| 41 if (stream == null) throw new ArgumentNullException("stream"); | |
| 42 baseStream = stream; | |
| 43 defaultbuffersize = bufferSize; | |
| 44 } | |
| 45 | |
| 46 public IAsyncResult BeginPrebuffering(AsyncCallback callback, Object state) { | |
| 47 return BeginPrebuffering(1, callback, state); | |
| 48 } | |
| 49 public IAsyncResult BeginPrebuffering(int count, AsyncCallback callback, Object state) { | |
| 50 AsyncResult ar = new AsyncResult(callback, state); | |
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51 if (prebuffercount >= count) { |
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52 ar.SetCompleted(true, prebuffercount, null); |
| 5 | 53 } else { |
| 54 PrepareBuffer(count); | |
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55 ar.Left = count - prebuffercount; |
| 5 | 56 int off = prebufferoffset + prebuffercount; |
| 57 baseStream.BeginRead(prebuffer, off, prebuffer.Length - off, asyncPrebufferReadCallback, ar); | |
| 58 } | |
| 59 return ar; | |
| 60 } | |
| 61 private void asyncPrebufferReadCallback(IAsyncResult ar) { | |
| 62 AsyncResult myar = (AsyncResult)ar.AsyncState; | |
| 63 try { | |
| 64 int len = baseStream.EndRead(ar); | |
| 65 if (len <= 0) { | |
| 66 myar.SetCompleted(false, prebuffercount, null); | |
| 67 } else { | |
| 68 myar.Left -= len; | |
| 69 prebuffercount += len; | |
| 70 if (myar.Left > 0) { | |
| 71 int off = prebufferoffset + prebuffercount; | |
| 72 baseStream.BeginRead(prebuffer, off, prebuffer.Length - off, asyncPrebufferReadCallback, myar); | |
| 73 } else { | |
| 74 myar.SetCompleted(false, prebuffercount, null); | |
| 75 } | |
| 76 } | |
| 77 } catch (Exception ex) { | |
| 78 myar.SetCompleted(false, prebuffercount, ex); | |
| 79 } | |
| 80 } | |
| 81 public int EndPrebuffering(IAsyncResult ar) { | |
| 82 AsyncResult myar = (AsyncResult)ar; | |
| 83 return myar.WaitForCompletion(); | |
| 84 } | |
| 85 public int Prebuffer() { | |
| 86 return Prebuffer(1); | |
| 87 } | |
| 88 public int Prebuffer(int count) { | |
| 89 count -= prebuffercount; | |
| 90 if (count <= 0) return prebuffercount; | |
| 91 PrepareBuffer(prebuffercount + count); | |
| 92 while (count > 0) { | |
| 93 int off = prebufferoffset + prebuffercount; | |
| 94 int len = baseStream.Read(prebuffer, off, prebuffer.Length - off); | |
| 95 if (len <= 0) return prebuffercount; | |
| 96 count -= len; | |
| 97 prebuffercount += len; | |
| 98 } | |
| 99 return prebuffercount; | |
| 100 } | |
| 101 private void PrepareBuffer(int count) { | |
| 102 if (prebuffercount == 0) prebufferoffset = 0; | |
| 103 if (prebuffer == null || (prebuffercount == 0 && prebuffer.Length > defaultbuffersize)) { | |
| 104 if (count < defaultbuffersize) count = defaultbuffersize; | |
| 105 prebuffer = new Byte[count]; | |
| 106 prebufferoffset = 0; | |
| 107 } else if (prebufferoffset + count > prebuffer.Length) { | |
| 108 if (count > prebuffer.Length) { | |
| 109 Byte[] newbuffer = new Byte[prebuffercount + count]; | |
| 110 Buffer.BlockCopy(prebuffer, prebufferoffset, newbuffer, 0, prebuffercount); | |
| 111 prebuffer = newbuffer; | |
| 112 } else { | |
| 113 Buffer.BlockCopy(prebuffer, prebufferoffset, prebuffer, 0, prebuffercount); | |
| 114 } | |
| 115 prebufferoffset = 0; | |
| 116 } | |
| 117 } | |
| 118 public Byte Peek() { | |
| 119 return Peek(0); | |
| 120 } | |
| 121 public Byte Peek(int offset) { | |
| 122 if (Prebuffer(offset + 1) < offset + 1) throw new EndOfStreamException(); | |
| 123 return prebuffer[prebufferoffset + offset]; | |
| 124 } | |
| 125 public void Peek(Byte[] buffer, int offset, int count) { | |
| 126 Peek(buffer, offset, 0, count); | |
| 127 } | |
| 128 public void Peek(Byte[] buffer, int bufferoffset, int peekoffset, int count) { | |
| 129 if (Prebuffer(peekoffset + count) < peekoffset + count) throw new EndOfStreamException(); | |
| 130 Buffer.BlockCopy(prebuffer, prebufferoffset + peekoffset, buffer, bufferoffset, count); | |
| 131 } | |
| 132 public int TryPeek() { | |
| 133 return TryPeek(0); | |
| 134 } | |
| 135 public int TryPeek(int offset) { | |
| 136 if (prebuffercount <= offset) return -1; | |
| 137 return prebuffer[prebufferoffset + offset]; | |
| 138 } | |
| 139 public int TryPeek(Byte[] buffer, int offset, int count) { | |
| 140 return TryPeek(buffer, offset, 0, count); | |
| 141 } | |
| 142 public int TryPeek(Byte[] buffer, int bufferoffset, int peekoffset, int count) { | |
| 143 if (prebuffercount < peekoffset + count) count = prebuffercount - peekoffset; | |
| 144 if (count < 0) count = 0; | |
| 145 if (count > 0) Buffer.BlockCopy(prebuffer, prebufferoffset + peekoffset, buffer, bufferoffset, count); | |
| 146 return count; | |
| 147 } | |
| 148 | |
| 149 public override int Read(byte[] buffer, int offset, int count) { | |
| 150 if (prebuffercount > 0 || count < 16) { | |
| 151 if (prebuffercount == 0) if (Prebuffer() < 1) return 0; | |
| 152 if (count > prebuffercount) count = prebuffercount; | |
| 153 Buffer.BlockCopy(prebuffer, prebufferoffset, buffer, offset, count); | |
| 154 prebufferoffset += count; | |
| 155 prebuffercount -= count; | |
| 156 return count; | |
| 157 } else { | |
| 158 return baseStream.Read(buffer, offset, count); | |
| 159 } | |
| 160 } | |
| 161 | |
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162 public void ReadAll(Byte[] buffer, int offset, int count) { |
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163 while (count > 0) { |
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164 int read = Read(buffer, offset, count); |
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165 if (read <= 0) throw new EndOfStreamException(); |
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166 offset += read; |
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167 count -= read; |
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168 } |
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169 } |
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170 |
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171 public Byte[] ReadAll(int count) { |
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172 Byte[] buffer = new Byte[count]; |
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173 ReadAll(buffer, 0, count); |
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174 return buffer; |
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175 } |
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176 |
| 5 | 177 public override int ReadByte() { |
| 178 if (Prebuffer(1) < 1) return -1; | |
| 179 int v = prebuffer[prebufferoffset]; | |
| 180 prebufferoffset++; | |
| 181 prebuffercount--; | |
| 182 return v; | |
| 183 } | |
| 184 | |
| 185 public override IAsyncResult BeginRead(byte[] buffer, int offset, int count, AsyncCallback callback, object state) { | |
| 186 if (prebuffercount > 0) { | |
| 187 if (count > prebuffercount) count = prebuffercount; | |
| 188 Buffer.BlockCopy(prebuffer, prebufferoffset, buffer, offset, count); | |
| 189 prebufferoffset += count; | |
| 190 prebuffercount -= count; | |
| 191 AsyncResult ar = new AsyncResult(callback, state); | |
| 192 ar.SetCompleted(true, count, null); | |
| 193 return ar; | |
| 194 } else { | |
| 195 return baseStream.BeginRead(buffer, offset, count, callback, state); | |
| 196 } | |
| 197 } | |
| 198 | |
| 199 public override int EndRead(IAsyncResult asyncResult) { | |
| 200 AsyncResult myar = asyncResult as AsyncResult; | |
| 201 if (myar != null) { | |
| 202 return myar.WaitForCompletion(); | |
| 203 } else { | |
| 204 return baseStream.EndRead(asyncResult); | |
| 205 } | |
| 206 } | |
| 207 | |
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208 public IAsyncResult BeginReadAll(byte[] buffer, int offset, int count, AsyncCallback callback, object state) { |
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209 AsyncResult ar = new AsyncResult(callback, state); |
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210 ar.Buffer = buffer; |
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211 ar.Offset = 0; |
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212 ar.Left = count; |
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213 ar.Count = 0; |
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214 if (prebuffercount > 0) { |
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215 int read = Math.Min(ar.Left, prebuffercount); |
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216 Buffer.BlockCopy(prebuffer, prebufferoffset, ar.Buffer, ar.Offset, read); |
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217 prebufferoffset += read; |
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218 prebuffercount -= read; |
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219 ar.Offset += read; |
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220 ar.Left -= read; |
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221 ar.Count += read; |
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222 } |
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223 if (ar.Left > 0) { |
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224 baseStream.BeginRead(ar.Buffer, ar.Offset, ar.Left, asyncReadAllReadCallback, ar); |
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225 } else { |
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226 ar.SetCompleted(true, count, null); |
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227 } |
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228 return ar; |
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229 } |
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230 |
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231 private void asyncReadAllReadCallback(IAsyncResult ar) { |
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232 AsyncResult myar = (AsyncResult)ar.AsyncState; |
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233 try { |
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234 int len = baseStream.EndRead(ar); |
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235 if (len <= 0) throw new EndOfStreamException(); |
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236 myar.Offset += len; |
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237 myar.Left -= len; |
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238 myar.Count += len; |
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239 if (myar.Left > 0) { |
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240 int off = prebufferoffset + prebuffercount; |
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241 baseStream.BeginRead(myar.Buffer, myar.Offset, myar.Left, asyncReadAllReadCallback, ar); |
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242 } else { |
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243 myar.SetCompleted(false, myar.Count, null); |
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244 } |
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245 } catch (Exception ex) { |
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246 myar.SetCompleted(false, ex); |
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247 } |
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248 } |
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249 |
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250 public int EndReadAll(IAsyncResult asyncResult) { |
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251 AsyncResult myar = asyncResult as AsyncResult; |
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252 return myar.WaitForCompletion(); |
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253 } |
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254 |
| 5 | 255 public override void Close() { |
| 256 base.Close(); | |
| 257 baseStream.Close(); | |
| 258 } | |
| 259 | |
| 260 public override void Write(byte[] buffer, int offset, int count) { | |
| 261 baseStream.Write(buffer, offset, count); | |
| 262 } | |
| 263 | |
| 264 public override void WriteByte(byte value) { | |
| 265 baseStream.WriteByte(value); | |
| 266 } | |
| 267 | |
| 268 public override IAsyncResult BeginWrite(byte[] buffer, int offset, int count, AsyncCallback callback, object state) { | |
| 269 return baseStream.BeginWrite(buffer, offset, count, callback, state); | |
| 270 } | |
| 271 | |
| 272 public override void EndWrite(IAsyncResult asyncResult) { | |
| 273 baseStream.EndWrite(asyncResult); | |
| 274 } | |
| 275 | |
| 276 public override int ReadTimeout { | |
| 277 get { return baseStream.ReadTimeout; } | |
| 278 set { baseStream.ReadTimeout = value; } | |
| 279 } | |
| 280 | |
| 281 public override int WriteTimeout { | |
| 282 get { return baseStream.WriteTimeout; } | |
| 283 set { baseStream.WriteTimeout = value; } | |
| 284 } | |
| 285 | |
| 286 public override long Length { get { return prebuffercount + baseStream.Length; } } | |
| 287 public override long Position { | |
| 288 get { return baseStream.Position - prebuffercount; } | |
| 289 set { throw new NotImplementedException(); } | |
| 290 } | |
| 291 | |
| 292 public override void SetLength(long value) { throw new NotImplementedException(); } | |
| 293 public override long Seek(long offset, SeekOrigin origin) { throw new NotImplementedException(); } | |
| 294 | |
| 295 public override bool CanRead { get { return prebuffercount > 0 || baseStream.CanRead; } } | |
| 296 public override bool CanSeek { get { return false; } } | |
| 297 public override bool CanTimeout { get { return baseStream.CanTimeout; } } | |
| 298 public override bool CanWrite { get { return baseStream.CanWrite; } } | |
| 299 | |
| 300 public int Buffered { get { return prebuffercount; } } | |
| 301 | |
| 302 public override void Flush() { | |
| 303 baseStream.Flush(); | |
| 304 } | |
| 305 } | |
| 306 } |