move to new cspot

components/spotify/cspot/bell/main/io/include/BellTar.h

@@ -0,0 +1,76 @@
+#pragma once
+
+#include <iostream>
+#include <string>
+#include <vector>
+
+namespace bell::BellTar {
+typedef long long unsigned file_size_t;
+
+////////////////////////////////////////
+// Writing raw data
+////////////////////////////////////////
+class writer {
+  std::ostream& _dst;
+
+ public:
+  writer(std::ostream& dst) : _dst(dst) {}
+  ~writer() { finish(); }
+
+  // Append the data specified by |data| and |file_size| into the
+  // tar file represented by |dst|.
+  // In the tar file, the data will be available at |path_in_tar|.
+  void put(std::string path_in_tar, char const* const data,
+           const file_size_t data_size);
+
+  // Write empty folder at |path_in_tar|.
+  // NOTE: to specify folders for files, just use / in the path
+  //       passed to |put()|.
+  void put_directory(std::string path_in_tar);
+
+  // Call after everything has been added to the tar represented
+  // by |dst| to make it a valid tar file.
+  void finish();
+};
+
+////////////////////////////////////////
+// Reading raw data
+////////////////////////////////////////
+class reader {
+  std::istream& _inp;
+  struct {
+    std::string file_name;
+    file_size_t file_size;
+    char file_type;
+  } _cached_header_data;
+  bool _cached_header_data_valid;
+  void _cache_header();
+  int _number_of_files;
+
+ public:
+  // Constructor, pass input stream |inp| pointing to a tar file.
+  reader(std::istream& inp)
+      : _inp(inp), _cached_header_data_valid(false), _number_of_files(-1) {}
+
+  // Returns true iff another file can be read from |inp|.
+  bool contains_another_file();
+
+  // Returns file name of next file in |inp|.
+  std::string get_next_file_name();
+  // Returns file size of next file in |inp|. Use to allocate
+  // memory for the |read_next_file()| call.
+  file_size_t get_next_file_size();
+
+  // Read next file in |inp| to |data|.
+  void read_next_file(char* const data);
+
+  char get_next_file_type();
+
+  void extract_all_files(std::string output_dir);
+  // Skip next file in |inp|.
+  void skip_next_file();
+
+  // Returns number of files in tar at |inp|.
+  int number_of_files();
+};
+}  // namespace bell::BellTar