Create fragment header

Export function that creates header of a fragment.

Author: lamphamsy

node-eclib.js

@@ -226,7 +226,13 @@ ECLib.prototype = {
             hd: 0,
             ct: 0
         };
-    }
+    },
+
+    addFragmentHeader: function(fragment, fragment_index, object_size,
+                                fragment_size) {
+        return addon.EclAddFragmentHeader(this.ins_id, fragment,
+            fragment_index, object_size, fragment_size, this.opt.ct, 1);
+    },
 }
 
 module.exports = ECLib;

src/cpp/libmain.cpp

@@ -117,3 +117,34 @@ NAN_METHOD(EclGetFragmentSize) {
     Nan::HandleScope scope;
     info.GetReturnValue().Set(Nan::New("C++ GetFragmentSize").ToLocalChecked());
 }
+
+NAN_METHOD(EclAddFragmentHeader) {
+    Nan::HandleScope scope;
+
+    if (info.Length() != 7) {
+        Nan::ThrowTypeError("Wrong number of arguments EclAddFragmentHeader");
+        return ;
+    }
+
+    ec_checksum_type_t ct;
+    ec_backend_t instance;
+
+    int desc = Nan::To<int>(info[0]).FromJust();
+    char *frag = node::Buffer::Data(info[1]);
+    int frag_idx = Nan::To<int>(info[2]).FromJust();
+    int64_t obj_size = Nan::To<int64_t>(info[3]).FromJust();
+    int frag_size = Nan::To<int>(info[4]).FromJust();
+    int _ct = Nan::To<int>(info[5]).FromJust();
+    int add_cs = Nan::To<int>(info[6]).FromJust();
+
+    ct  = get_ec_checksum_type(_ct);
+
+    instance = liberasurecode_backend_instance_get_by_desc(desc);
+
+    init_fragment_header(frag);
+    add_fragment_metadata(instance, frag, frag_idx, obj_size, frag_size, ct,
+                            add_cs);
+
+    info.GetReturnValue().Set(Nan::NewBuffer(frag,
+        frag_size + header_size).ToLocalChecked());
+}

src/cpp/libmain.h

@@ -23,11 +23,16 @@
  */
 
 #ifndef ECLIB_LIBMAIN_H
-# define ECLIB_LIBMAIN_H
+#define ECLIB_LIBMAIN_H
 
 #include <nan.h>
 #include <liberasurecode/erasurecode.h>
+#include <liberasurecode/erasurecode_backend.h>
 #include <liberasurecode/erasurecode_helpers.h>
+extern "C" {
+#include <liberasurecode/erasurecode_helpers_ext.h>
+#include <liberasurecode/erasurecode_postprocessing.h>
+}
 
 NAN_METHOD(EclCreate);
 NAN_METHOD(EclDestroy);
@@ -38,5 +43,6 @@ NAN_METHOD(EclVerifyStripeMetadata);
 NAN_METHOD(EclGetAlignedDataSize);
 NAN_METHOD(EclGetMinimumEncodeSize);
 NAN_METHOD(EclGetFragmentSize);
+NAN_METHOD(EclAddFragmentHeader);
 
 #endif /* ECLIB_LIBMAIN_H */

src/cpp/node-eclib.cpp

@@ -44,6 +44,7 @@ NAN_MODULE_INIT(Init) {
   NAN_EXPORT(target, EclGetAlignedDataSize);
   NAN_EXPORT(target, EclGetMinimumEncodeSize);
   NAN_EXPORT(target, EclGetFragmentSize);
+  NAN_EXPORT(target, EclAddFragmentHeader);
 }
 
 NODE_MODULE(node_eclib, Init)