Initial interractive zoom support

[pulseview.git] / datasnapshot.cpp

diff --git a/datasnapshot.cpp b/datasnapshot.cpp
index 1a6376882286760b36a9be7acb8827312ef74a3e..80d9ba4318f53f83e8d89604d658870d677e4b69 100644 (file)
--- a/datasnapshot.cpp
+++ b/datasnapshot.cpp
@@ -20,12 +20,31 @@
 
 #include "datasnapshot.h"
 
-DataSnapshot::DataSnapshot() :
-       _sample_count(0)
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+
+DataSnapshot::DataSnapshot(int unit_size) :
+       _data(NULL),
+       _data_length(0),
+       _unit_size(unit_size)
+{
+       assert(_unit_size > 0);
+}
+
+DataSnapshot::~DataSnapshot()
 {
+       free(_data);
 }
 
 uint64_t DataSnapshot::get_sample_count()
 {
-       return _sample_count;
+       return _data_length / _unit_size;
+}
+
+void DataSnapshot::append_data(void *data, uint64_t length)
+{
+       _data = realloc(_data, _data_length + length);
+       memcpy((uint8_t*)_data + _data_length, data, length);
+       _data_length += length;
 }