1 files changed, 129 insertions, 0 deletions
diff --git a/hicn-light/src/core/streamBuffer.h b/hicn-light/src/core/streamBuffer.h
new file mode 100755
index 000000000..27e793176
--- /dev/null
+++ b/hicn-light/src/core/streamBuffer.h
@@ -0,0 +1,129 @@
+/*
+ * Copyright (c) 2017-2019 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Wrapper around event scheduler
+ */
+
+#ifndef streamBuffer_h
+#define streamBuffer_h
+
+#include <parc/algol/parc_EventQueue.h>
+#include <stdbool.h>
+
+void streamBuffer_Destroy(PARCEventQueue **bufferPtr);
+
+/**
+ * @function streamBuffer_SetWatermark
+ * @abstract Sets the read and/or write watermarks
+ * @discussion
+ *   For a read watermark, when there is at least <code>low</code> bytes
+ * available to read, the read callback will be fired.  If the bytes in the
+ * buffer exceed <code>high</code>, the stream buffer will stop reading from the
+ * network.
+ *
+ *   For a write watermark, when the bytes in the buffer fall below
+ * <code>low</code>, the write callback is fired.   The <code>high</code>
+ * watermark limits stream filters and shapers from exceeding that threashold on
+ * what they write to the buffer.
+ *
+ */
+void streamBuffer_SetWatermark(PARCEventQueue *buffer, bool setRead,
+                               bool setWrite, size_t low, size_t high);
+
+/**
+ * @function streamBuffer_Flush
+ * @abstract The buffer will read/write more data if available
+ *
+ * @return -1 error, 0 no more data, 1 more data
+ */
+int streamBuffer_Flush(PARCEventQueue *buffer, bool flushRead, bool flushWrite);
+
+/**
+ * @function streamBuffer_FlushCheckpoint
+ * @abstract Flushes the stream, checkpointing all data in the buffer
+ */
+int streamBuffer_FlushCheckpoint(PARCEventQueue *buffer, bool flushRead,
+                                 bool flushWrite);
+
+/**
+ * @function streamBuffer_FlushFinished
+ * @abstract Flush the stream and indicate the end of new data
+ */
+int streamBuffer_FlushFinished(PARCEventQueue *buffer, bool flushRead,
+                               bool flushWrite);
+
+/**
+ * @typedef StreamBufferReadWriteCallback
+ * @abstract Callback when data is available or write space available
+ * @constant user_data opaque data passed to
+ * <code>StreamBuffer_SetCallbacks()</code>
+ */
+typedef void(StreamBufferReadWriteCallback)(PARCEventQueue *buffer,
+                                            void *user_data);
+
+/**
+ * @typedef StreamBufferEventCallback
+ * @abstract Callback on error or other event on the stream buffer
+ * @constant what logical or of STREAM events.  STREAM_READING and
+ * STREAM_WRITING indicate if the error was on the read or write direction.  The
+ * conditions may be STREAM_ERROR, STREAM_EOF, STREAM_TIMEOUT, or
+ * STREAM_CONNECTED.
+ * @constant user_data opaque data passed to
+ * <code>StreamBuffer_SetCallbacks()</code>
+ */
+typedef void(StreamBufferEventCallback)(PARCEventQueue *buffer, short what,
+                                        void *user_data);
+
+/**
+ * Changes the callbacks for a buffer event.
+ *
+ * @param bufev the buffer event object for which to change callbacks
+ * @param readcb callback to invoke when there is data to be read, or NULL if
+ * no callback is desired
+ * @param writecb callback to invoke when the file descriptor is ready for
+ * writing, or NULL if no callback is desired
+ * @param eventcb callback to invoke when there is an event on the file
+ * descriptor
+ * @param cbarg an argument that will be supplied to each of the callbacks
+ * (readcb, writecb, and errorcb)
+ * @see parcEventQueue_Create()
+ */
+void streamBuffer_SetCallbacks(PARCEventQueue *buffer,
+                               PARCEventQueue_Callback *readCallback,
+                               PARCEventQueue_Callback *writeCallback,
+                               PARCEventQueue_EventCallback *eventCallback,
+                               void *user_data);
+
+/**
+ * @function StreamBuffer_EnableCallbacks
+ * @abstract Enables specified callbacks.  Does not affect others.
+ * @discussion
+ *   Enables disabled callbacks.  If a callback is already enabled, has no
+ * effect. A "false" value does not disable it.
+ */
+void streamBuffer_EnableCallbacks(PARCEventQueue *buffer, bool enableRead,
+                                  bool enableWrite);
+
+/**
+ * @function StreamBuffer_DisableCallbacks
+ * @abstract Disables specified callbacks.  Does not affect others.
+ * @discussion
+ *   Disables enabled callbacks.  If a callback is already disabled, has no
+ * effect. A "false" value does not enable it.
+ */
+void streamBuffer_DisableCallbacks(PARCEventQueue *buffer, bool disableRead,
+                                   bool disableWrite);
+#endif  // streamBuffer_h