layout.hpp

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#pragma once
 
#include <fcb/error.hpp>
#include <fcb/span.hpp>
 
#include <cstdint>
 
namespace fcb {
 
constexpr std::size_t kMagicBytesSize = 8;
constexpr std::size_t kHeaderSizeSize = 4;
constexpr std::size_t kHeaderMinBufferSize = 8;
constexpr std::size_t kHeaderMaxBufferSize = 1024ULL * 1024ULL * 512ULL;  // 512 MB
constexpr std::uint8_t kVersion = 1;
constexpr std::size_t kNodeItemSize = 40;
constexpr std::uint16_t kDefaultNodeSize = 16;
 
constexpr std::uint64_t kMaxFeatureSize = 256ULL * 1024ULL * 1024ULL;
 
bool check_magic_bytes(bytes_view b);
 
std::uint64_t rtree_index_size(std::uint64_t num_items, std::uint16_t node_size);
 
struct FileLayout {
    std::uint64_t header_len;
    std::uint64_t rtree_begin;
    std::uint64_t rtree_size;
    std::uint64_t attr_index_begin;
    std::uint64_t attr_index_size;
    std::uint64_t feature_begin;
};
 
FileLayout compute_layout(std::uint32_t header_size, std::uint64_t features_count,
                          std::uint16_t index_node_size, std::uint64_t attr_index_size);
 
void validate_layout_against_size(const FileLayout& l, std::uint64_t total_size);
 
}  // namespace fcb