Setting dac names for CTB (C++ and Python) (#413)

# Setting DAC names for CTB
* Introduced new shared memory for CTB only
* Prepared for additional functionality 
* Works from C++ and Python

Co-authored-by: Dhanya Thattil <dhanya.thattil@psi.ch>

slsDetectorSoftware/src/CtbConfig.cpp

@@ -0,0 +1,72 @@
+
+#include "CtbConfig.h"
+#include "SharedMemory.h"
+#include "sls/ToString.h"
+#include "sls/string_utils.h"
+
+#include <algorithm>
+#include <fstream>
+#include <sstream>
+
+namespace sls {
+
+CtbConfig::CtbConfig(){
+    for (size_t i=0; i!=num_dacs; ++i){
+        setDacName(i, "dac"+ToString(i));
+    }
+}
+
+void CtbConfig::check_index(size_t i) const {
+    if (!(i < num_dacs)) {
+        std::ostringstream oss;
+        oss << "DAC index is too large needs to be below " << num_dacs;
+        throw RuntimeError(oss.str());
+    }
+}
+
+void CtbConfig::check_size(const std::string &name) const {
+   
+    if (name.empty())
+        throw RuntimeError("Name needs to be at least one character");
+
+     // dacname_length -1 to account for \0 termination
+    if (!(name.size() < (name_length - 1))) {
+        std::ostringstream oss;
+        oss << "Length of name needs to be less than " << name_length - 1
+            << " chars";
+        throw RuntimeError(oss.str());
+    }
+}
+
+void CtbConfig::setDacName(size_t index, const std::string &name) {
+
+    check_index(index);
+    check_size(name);
+
+    char *dst = &dacnames[index * name_length];
+    memset(dst, '\0', name_length);
+    memcpy(dst, &name[0], name.size());
+}
+
+void CtbConfig::setDacNames(const std::vector<std::string>& names){
+    for (size_t i = 0; i!=num_dacs; ++i){
+        setDacName(i, names[i]);
+    }
+}
+
+std::string CtbConfig::getDacName(size_t index) const {
+    return dacnames + index * name_length;
+}
+
+std::vector<std::string> CtbConfig::getDacNames() const {
+    std::vector<std::string> names;
+    for (size_t i = 0; i != num_dacs; ++i)
+        names.push_back(getDacName(i));
+    return names;
+}
+
+const char* CtbConfig::shm_tag(){
+    return shm_tag_;
+}
+
+} // namespace sls