1 files changed, 98 insertions, 0 deletions
diff --git a/deno2/file_util.cc b/deno2/file_util.cc
new file mode 100644
index 000000000..e2c1b3049
--- /dev/null
+++ b/deno2/file_util.cc
@@ -0,0 +1,98 @@
+// Copyright 2018 Ryan Dahl <ry@tinyclouds.org>
+// All rights reserved. MIT License.
+#include <stdio.h>
+#include <fstream>
+#include <iterator>
+#include <string>
+
+#include "file_util.h"
+
+namespace deno {
+
+bool ReadFileToString(const char* fn, std::string* contents) {
+  std::ifstream file(fn, std::ios::binary);
+  contents->assign(std::istreambuf_iterator<char>{file}, {});
+  return !file.bad();
+}
+
+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 \"v8/include/v8.h\"\n\n";
+  }
+
+  void WriteSuffix() {
+    char buffer[500];
+    snprintf(buffer, sizeof(buffer),
+             "const v8::StartupData* StartupBlob_%s() {\n", name_);
+    file_ << buffer;
+    snprintf(buffer, sizeof(buffer), "  return &%s_blob;\n", name_);
+    file_ << buffer;
+    file_ << "}\n\n";
+  }
+
+  void WriteBinaryContentsAsCArray() {
+    char buffer[5];
+    for (size_t i = 0; i < data_.size(); i++) {
+      if ((i & 0x1F) == 0x1F) file_ << "\n";
+      if (i > 0) file_ << ",";
+      snprintf(buffer, sizeof(buffer), "%u",
+               static_cast<unsigned char>(data_.at(i)));
+      file_ << buffer;
+    }
+    file_ << "\n";
+  }
+
+  void WriteData() {
+    char buffer[500];
+    snprintf(buffer, sizeof(buffer), "static const char %s_blob_data[] = {\n",
+             name_);
+    file_ << buffer;
+    WriteBinaryContentsAsCArray();
+    file_ << "};\n";
+    snprintf(buffer, sizeof(buffer), "static const int %s_blob_size = %ld;\n",
+             name_, data_.size());
+    file_ << buffer;
+    snprintf(buffer, sizeof(buffer), "static const v8::StartupData %s_blob =\n",
+             name_);
+    file_ << buffer;
+    snprintf(buffer, sizeof(buffer),
+             "{ (const char*) %s_blob_data, %s_blob_size };\n", name_, name_);
+    file_ << buffer;
+  }
+
+  const char* name_;
+  const char* filename_;
+  std::string data_;
+  std::ofstream file_;
+};
+
+bool WriteDataAsCpp(const char* name, const char* filename,
+                    const std::string& data) {
+  StartupDataCppWriter writer(name, filename, data);
+  return writer.Write();
+}
+
+}  // namespace deno