Add --c-header flag to generate headers

create_graph_dumb.py

 import random
 import argparse
+import warnings
+import os
 
 
 def create_random_graph(args):
@@ -39,6 +41,25 @@ def ntf_parse(args):
     return nodes, len(data)
 
 
+def to_header_file(nodes, nb_links, output):
+    # Check that the extension is correct.
+    _, file_extension = os.path.splitext(output)
+    if file_extension != ".h":
+        warnings.warn(f'The extension of the output file is not ".h": {output}')
+
+    s = ""
+    
+    # Create the array containing the links.
+    for node_id, neighs in nodes.items():
+        for (neigh_id, cost) in neighs:
+            s += f"\t{{{node_id}, {neigh_id}, {cost}}},\n"
+    s = s[:-2] + "\n"
+
+    with open(output, "w+") as fd:
+        content = f'#include <stdint.h>\n\n#define NB_NODES {len(nodes)}\n#define NB_LINKS {nb_links}\n\nint64_t links[NB_LINKS][3] = {{\n{s}}};'
+        fd.write(content)
+
+
 def to_binary_file(nodes, nb_links, output):
     nb_nodes = len(nodes)
     with open(output, "wb+") as fd:
@@ -50,19 +71,20 @@ def to_binary_file(nodes, nb_links, output):
             for j, cost in nodes[node]:
                 fd.write(node.to_bytes(4, "big"))
                 fd.write(j.to_bytes(4, "big"))
-                fd.write(cost.to_bytes(4, "big"))
+                fd.write(cost.to_bytes(4, "big", signed=True))
 
 
 if __name__ == "__main__":
     parser = argparse.ArgumentParser()
-    parser.add_argument("--ntf", type=str, default=None,
+    parser.add_argument("-t", "--ntf", type=str, default=None,
                         help="Parse an NTF file instead of creating a graph")
-    parser.add_argument("--output", type=str,
+    parser.add_argument("-o", "--output", type=str,
                         help="Output file", default="graph.bin")
     parser.add_argument("-n", "--nodes", type=int,
                         help="Number of nodes. Unused if '--ntf'", default=5)
     parser.add_argument("-l", "--links", type=int,
                         help="Number of links. Unused if '--ntf'", default=10)
+    parser.add_argument("--c-header", action="store_true", help="Writes the graph as a C header file (.h) instead of a binary file")
     args = parser.parse_args()
 
     if args.ntf:
@@ -70,4 +92,7 @@ if __name__ == "__main__":
     else:
         graph, nb_links = create_random_graph(args)
 
-    to_binary_file(graph, nb_links, args.output)
+    if args.c_header:
+        to_header_file(graph, nb_links, args.output)
+    else:
+        to_binary_file(graph, nb_links, args.output)