1 files changed, 194 insertions, 0 deletions
diff --git a/Plugins/jingle/libjingle/talk/base/streamutils.cc b/Plugins/jingle/libjingle/talk/base/streamutils.cc
new file mode 100644
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--- /dev/null
+++ b/Plugins/jingle/libjingle/talk/base/streamutils.cc
@@ -0,0 +1,194 @@
+/*
+ * libjingle
+ * Copyright 2004--2006, Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+#include "talk/base/common.h"
+#include "talk/base/streamutils.h"
+
+///////////////////////////////////////////////////////////////////////////////
+// TODO: Extend so that one side can close, and other side can send
+// buffered data.
+
+StreamRelay::StreamRelay(talk_base::StreamInterface* s1, 
+                         talk_base::StreamInterface* s2,
+                         size_t buffer_size) : buffer_size_(buffer_size) {
+  dir_[0].stream = s1;
+  dir_[1].stream = s2;
+
+  ASSERT(s1->GetState() != talk_base::SS_CLOSED);
+  ASSERT(s2->GetState() != talk_base::SS_CLOSED);
+
+  for (size_t i=0; i<2; ++i) {
+    dir_[i].stream->SignalEvent.connect(this, &StreamRelay::OnEvent);
+    dir_[i].buffer = new char[buffer_size_];
+    dir_[i].data_len = 0;
+  }
+}
+
+StreamRelay::~StreamRelay() {
+  for (size_t i=0; i<2; ++i) {
+    delete dir_[i].stream;
+    delete [] dir_[i].buffer;
+  }
+}
+
+void
+StreamRelay::Circulate() {
+  int error = 0;
+  if (!Flow(0, &error) || !Flow(1, &error)) {
+    Close();
+    SignalClosed(this, error);
+  }
+}
+
+void
+StreamRelay::Close() {
+  for (size_t i=0; i<2; ++i) {
+    dir_[i].stream->SignalEvent.disconnect(this);
+    dir_[i].stream->Close();
+  }
+}
+
+bool
+StreamRelay::Flow(int read_index, int* error) {
+  Direction& reader = dir_[read_index];
+  Direction& writer = dir_[Complement(read_index)];
+
+  bool progress;
+  do {
+    progress = false;
+
+    while (reader.stream->GetState() == talk_base::SS_OPEN) {
+      size_t available = buffer_size_ - reader.data_len;
+      if (available == 0)
+        break;
+
+      *error = 0;
+      size_t read = 0;
+      talk_base::StreamResult result 
+        = reader.stream->Read(reader.buffer + reader.data_len, available, 
+                              &read, error);
+      if ((result == talk_base::SR_BLOCK) || (result == talk_base::SR_EOS))
+        break;
+
+      if (result == talk_base::SR_ERROR)
+        return false;
+
+      progress = true;
+      ASSERT((read > 0) && (read <= available));
+      reader.data_len += read;
+    }
+
+    size_t total_written = 0;
+    while (writer.stream->GetState() == talk_base::SS_OPEN) {
+      size_t available = reader.data_len - total_written;
+      if (available == 0)
+        break;
+
+      *error = 0;
+      size_t written = 0;
+      talk_base::StreamResult result 
+          = writer.stream->Write(reader.buffer + total_written,
+                                 available, &written, error);
+      if ((result == talk_base::SR_BLOCK) || (result == talk_base::SR_EOS))
+        break;
+
+      if (result == talk_base::SR_ERROR)
+        return false;
+
+      progress = true;
+      ASSERT((written > 0) && (written <= available));
+      total_written += written;
+    }
+
+    reader.data_len -= total_written;
+    if (reader.data_len > 0) {
+      memmove(reader.buffer, reader.buffer + total_written, reader.data_len);
+    }
+  } while (progress);
+
+  return true;
+}
+
+void StreamRelay::OnEvent(talk_base::StreamInterface* stream, int events, 
+                          int error) {
+  int index = Index(stream);
+
+  // Note: In the following cases, we are treating the open event as both
+  // readable and writeable, for robustness.  It won't hurt if we are wrong.
+
+  if ((events & talk_base::SE_OPEN | talk_base::SE_READ) 
+      && !Flow(index, &error)) {
+    events = talk_base::SE_CLOSE;
+  }
+
+  if ((events & talk_base::SE_OPEN | talk_base::SE_WRITE) 
+      && !Flow(Complement(index), &error)) {
+    events = talk_base::SE_CLOSE;
+  }
+
+  if (events & talk_base::SE_CLOSE) {
+    Close();
+    SignalClosed(this, error);
+  }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// StreamCounter - counts the number of bytes which are transferred in either
+//  direction.
+///////////////////////////////////////////////////////////////////////////////
+
+StreamCounter::StreamCounter(talk_base::StreamInterface* stream)
+  : StreamAdapterInterface(stream), count_(0) {
+}
+
+talk_base::StreamResult StreamCounter::Read(void* buffer, size_t buffer_len,
+                                            size_t* read, int* error) {
+  size_t tmp;
+  if (!read)
+    read = &tmp;
+  talk_base::StreamResult result 
+    = StreamAdapterInterface::Read(buffer, buffer_len,
+                                   read, error);
+  if (result == talk_base::SR_SUCCESS)
+    count_ += *read;
+  SignalUpdateByteCount(count_);
+  return result;
+}
+
+talk_base::StreamResult StreamCounter::Write(
+    const void* data, size_t data_len, size_t* written, int* error) {
+  size_t tmp;
+  if (!written)
+    written = &tmp;
+  talk_base::StreamResult result 
+    = StreamAdapterInterface::Write(data, data_len, written, error);
+  if (result == talk_base::SR_SUCCESS)
+    count_ += *written;
+  SignalUpdateByteCount(count_);
+  return result;
+}