1 files changed, 58 insertions, 1 deletions
diff --git a/src/snapshot_creator.cc b/src/snapshot_creator.cc
index cb5caf304..3aca7c3a8 100644
--- a/src/snapshot_creator.cc
+++ b/src/snapshot_creator.cc
@@ -1,6 +1,7 @@
 // Copyright 2018 Ryan Dahl <ry@tinyclouds.org>
 // All rights reserved. MIT License.
 // Hint: --trace_serializer is a useful debugging flag.
+#include <fstream>
 #include "deno.h"
 #include "file_util.h"
 #include "internal.h"
@@ -40,6 +41,61 @@ v8::StartupData MakeSnapshot(const char* js_filename, const char* js_source) {
   return snapshot_blob;
 }
 
+class StartupDataCppWriter {
+ public:
+  StartupDataCppWriter(const char* name, const char* filename,
+                       const std::string& data)
+      : name_(name),
+        filename_(filename),
+        data_(data),
+        file_(filename_, std::ios::binary) {}
+
+  bool Write() {
+    if (file_.bad()) {
+      return false;
+    }
+    WritePrefix();
+    WriteData();
+    WriteSuffix();
+
+    file_.close();
+    // printf("Wrote %s %d %s \n", name_, data_.size(), filename_);
+    return !file_.bad();
+  }
+
+ private:
+  void WritePrefix() {
+    file_ << "// Autogenerated snapshot file. Do not edit.\n\n";
+    file_ << "#include \"third_party/v8/include/v8.h\"\n\n";
+    file_ << "namespace deno { \n\n";
+  }
+
+  void WriteSuffix() {
+    char buffer[500];
+    snprintf(buffer, sizeof(buffer), "v8::StartupData* StartupBlob_%s() {\n",
+             name_);
+    file_ << buffer;
+    snprintf(buffer, sizeof(buffer), "  return &%s_blob;\n", name_);
+    file_ << buffer;
+    file_ << "}\n\n";
+    file_ << "}  // namespace deno\n\n";
+  }
+
+  void WriteData() {
+    char buffer[500];
+    file_ << BinaryContentAsC(name_, data_);
+    snprintf(buffer, sizeof(buffer),
+             "static v8::StartupData %s_blob = { %s_data, %s_size };\n", name_,
+             name_, name_);
+    file_ << buffer;
+  }
+
+  const char* name_;
+  const char* filename_;
+  std::string data_;
+  std::ofstream file_;
+};
+
 }  // namespace deno
 
 int main(int argc, char** argv) {
@@ -59,5 +115,6 @@ int main(int argc, char** argv) {
   auto snapshot_blob = deno::MakeSnapshot(js_fn, js_source.c_str());
   std::string snapshot_str(snapshot_blob.data, snapshot_blob.raw_size);
 
-  CHECK(deno::WriteDataAsCpp("snapshot", snapshot_out_cc, snapshot_str));
+  deno::StartupDataCppWriter writer("snapshot", snapshot_out_cc, snapshot_str);
+  CHECK(writer.Write());
 }