add PatchFileIndex

src/PatchFileIndex.hh

@@ -0,0 +1,48 @@
+#pragma once
+
+#include <inttypes.h>
+
+#include <string>
+#include <unordered_map>
+#include <map>
+#include <vector>
+#include <memory>
+
+
+
+struct PatchFileIndex {
+  explicit PatchFileIndex(const std::string& root_dir);
+
+  struct File {
+    struct Chunk {
+      std::string data;
+      uint32_t crc32;
+    };
+    std::vector<std::string> path_directories;
+    std::string name;
+    std::vector<Chunk> chunks;
+    size_t size;
+    uint32_t crc32;
+
+    File() : size(0), crc32(0) { }
+    void load_data(const std::string& root_dir);
+  };
+
+  std::vector<std::shared_ptr<File>> files;
+  std::string root_dir;
+};
+
+struct PatchFileChecksumRequest {
+  std::shared_ptr<const PatchFileIndex::File> file;
+  uint32_t crc32;
+  uint32_t size;
+  bool response_received;
+
+  explicit PatchFileChecksumRequest(std::shared_ptr<const PatchFileIndex::File> file)
+    : file(file), crc32(0), size(0), response_received(false) { }
+  inline bool needs_update() const {
+    return !this->response_received ||
+           (this->crc32 != this->file->crc32) ||
+           (this->size != this->file->size);
+  }
+};