Initial commit of an experimental COAP/HTTP/REST implementation for Contiki

apps/rest-common/buffer.c

@@ -0,0 +1,75 @@
+/*
+ * buffer.c
+ *
+ *  Created on: Oct 19, 2010
+ *      Author: dogan
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include "buffer.h"
+
+uint8_t* data_buffer;
+uint16_t buffer_size;
+uint16_t buffer_index;
+
+void
+delete_buffer(void)
+{
+  if (data_buffer) {
+    free(data_buffer);
+    buffer_index = 0;
+    buffer_size = 0;
+  }
+}
+
+uint8_t*
+init_buffer(uint16_t size)
+{
+  delete_buffer();
+  data_buffer = (uint8_t*)malloc(size);
+  if (data_buffer) {
+    buffer_size = size;
+  }
+  buffer_index = 0;
+
+  return data_buffer;
+}
+
+uint8_t*
+allocate_buffer(uint16_t size)
+{
+  uint8_t* buffer = NULL;
+  /*To get rid of alignment problems, always allocate even size*/
+  if (size % 2) {
+    size++;
+  }
+  if (buffer_index + size < buffer_size) {
+    buffer = data_buffer + buffer_index;
+    buffer_index += size;
+  }
+
+  return buffer;
+}
+
+uint8_t*
+copy_to_buffer(void* data, uint16_t len)
+{
+  uint8_t* buffer = allocate_buffer(len);
+  if (buffer) {
+    memcpy(buffer, data, len);
+  }
+
+  return buffer;
+}
+
+uint8_t*
+copy_text_to_buffer(char* text)
+{
+  uint8_t* buffer = allocate_buffer(strlen(text) + 1);
+  if (buffer) {
+    strcpy(buffer, text);
+  }
+
+  return buffer;
+}