GitPackIdxV2.h

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#ifndef GITPACKIDXV2_H
#define GITPACKIDXV2_H
 
#include "GitHash.h"
#include "GitPack.h"
#include <QIODevice>
#include <cstdint>
#include <memory>
#include <vector>
 
struct GitPackIdxItem {
    uint8_t id[GIT_ID_LENGTH / 2];
    GitObject::Type type = GitObject::Type::UNKNOWN;
    size_t offset = 0;
    size_t packed_size = 0;
    size_t expanded_size = 0;
    uint32_t checksum;
    static std::string string(GitPackIdxItem const &item);
};
 
class GitPackIdxV2 {
    friend class GitObjectManager;
private:
    QString pack_idx_path; // e.g. "/path/to/pack-56430ed038c968ded87eb3756dcde85bfafc10ce.idx"
 
    struct header_t {
        uint8_t magic[8];
        uint32_t fanout[256];
    };
 
    struct trailer_t {
        uint8_t packfile_checksum[20];
        uint8_t idxfile_checksum[20];
    };
 
    struct object_id_t {
        uint8_t id[20];
    };
 
    struct Data {
        header_t header;
        trailer_t trailer;
        std::vector<object_id_t> objects;
        std::vector<GitPackIdxItem> item_list;
        std::vector<GitPackIdxItem *> item_list_order_by_id;
        std::vector<GitPackIdxItem *> item_list_order_by_offset;
    } d;
 
private:
 
    static QString toString(const uint8_t *p);
    static inline uint32_t read_uint32_be(void const *p);
    static inline uint32_t get_fanout(header_t const *t, int i);
 
    const uint8_t *object(int i) const;
    void clear();
    bool parse(QIODevice *in, int ids_only);
    bool parse(QString const &idxfile, int ids_only);
    void fetch() const;
public:
    GitPackIdxV2() = default;
    ~GitPackIdxV2();
    QString pack_file_path() const;
    GitPackIdxItem const *item(GitHash const &id) const;
    GitPackIdxItem const *item(size_t offset) const;
    void each(std::function<bool(GitPackIdxItem const *)> const &fn) const;
};
 
#endif // GITPACKIDXV2_H