1 files changed, 113 insertions, 0 deletions
diff --git a/os/hal/lib/streams/memstreams.c b/os/hal/lib/streams/memstreams.c
new file mode 100644
index 000000000..71401f43e
--- /dev/null
+++ b/os/hal/lib/streams/memstreams.c
@@ -0,0 +1,113 @@
+/*
+    ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio
+
+    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.
+*/
+
+/**
+ * @file    memstreams.c
+ * @brief   Memory streams code.
+ *
+ * @addtogroup memory_streams
+ * @{
+ */
+
+#include <string.h>
+
+#include "hal.h"
+#include "memstreams.h"
+
+/*===========================================================================*/
+/* Driver local definitions.                                                 */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported variables.                                                */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local variables.                                                   */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local functions.                                                   */
+/*===========================================================================*/
+
+static size_t writes(void *ip, const uint8_t *bp, size_t n) {
+  MemoryStream *msp = ip;
+
+  if (msp->size - msp->eos < n)
+    n = msp->size - msp->eos;
+  memcpy(msp->buffer + msp->eos, bp, n);
+  msp->eos += n;
+  return n;
+}
+
+static size_t reads(void *ip, uint8_t *bp, size_t n) {
+  MemoryStream *msp = ip;
+
+  if (msp->eos - msp->offset < n)
+    n = msp->eos - msp->offset;
+  memcpy(bp, msp->buffer + msp->offset, n);
+  msp->offset += n;
+  return n;
+}
+
+static msg_t put(void *ip, uint8_t b) {
+  MemoryStream *msp = ip;
+
+  if (msp->size - msp->eos <= 0)
+    return MSG_RESET;
+  *(msp->buffer + msp->eos) = b;
+  msp->eos += 1;
+  return MSG_OK;
+}
+
+static msg_t get(void *ip) {
+  uint8_t b;
+  MemoryStream *msp = ip;
+
+  if (msp->eos - msp->offset <= 0)
+    return MSG_RESET;
+  b = *(msp->buffer + msp->offset);
+  msp->offset += 1;
+  return b;
+}
+
+static const struct MemStreamVMT vmt = {writes, reads, put, get};
+
+/*===========================================================================*/
+/* Driver exported functions.                                                */
+/*===========================================================================*/
+
+/**
+ * @brief   Memory stream object initialization.
+ *
+ * @param[out] msp      pointer to the @p MemoryStream object to be initialized
+ * @param[in] buffer    pointer to the memory buffer for the memory stream
+ * @param[in] size      total size of the memory stream buffer
+ * @param[in] eos       initial End Of Stream offset. Normally you need to
+ *                      put this to zero for RAM buffers or equal to @p size
+ *                      for ROM streams.
+ */
+void msObjectInit(MemoryStream *msp, uint8_t *buffer,
+                  size_t size, size_t eos) {
+
+  msp->vmt    = &vmt;
+  msp->buffer = buffer;
+  msp->size   = size;
+  msp->eos    = eos;
+  msp->offset = 0;
+}
+
+/** @} */