initial runs

src/file_reader.cpp

@@ -0,0 +1,62 @@
+#include "../include/file_reader.hpp"
+
+void FileReader::refill_buffer()
+{
+    current_pos_ = 0;
+    valid_items_ = 0;
+
+    for (size_t i = 0; i < buffer_.size(); ++i) {
+        Record record;
+        if (!(stream_ >> record)) {
+            break;
+        }
+        buffer_[i] = record;
+        valid_items_ = i + 1;
+    }
+}
+
+FileReader::FileReader(const std::string& filename, size_t buffer_size)
+    : stream_(filename)
+    , buffer_(buffer_size)
+    , current_pos_(0)
+    , valid_items_(0)
+    , total_reads_(0)
+{
+    refill_buffer();
+}
+
+std::optional<Record> FileReader::read()
+{
+    if (current_pos_ >= valid_items_) {
+        refill_buffer();
+    }
+
+    if (valid_items_ == 0) {
+        return std::nullopt;
+    }
+
+    Record record = buffer_[current_pos_];
+    current_pos_++;
+    total_reads_++;
+
+    return record;
+}
+
+size_t FileReader::read_chunk(std::span<Record>& chunk)
+{
+    size_t count = 0;
+    for (size_t i = 0; i < chunk.size(); i++) {
+        auto record = read();
+        if (!record.has_value()) {
+            break;
+        }
+        chunk[count] = record.value();
+        count++;
+    }
+    return count;
+}
+
+size_t FileReader::total_reads() const
+{
+    return total_reads_;
+}