code_twain/sane/gb_json.h

#pragma once

#if defined(WIN32) || defined(_WIN64)
#include <Windows.h>
#include "../../code_device/hgsane/cJSON.h"
#define PATH_SYMBOL "\\"
#else
#include "cJSON.h"
#define PATH_SYMBOL "/"
#define NULL        nullptr
#define DWORD_PTR   char*
#define _countof(a) sizeof(a) / sizeof(a[0])
#endif

// 
#include <vector>
#include <string>
#include <map>
#include <algorithm>

namespace gb
{
    class scanner_cfg;
    class refer
    {
        volatile long ref_;

    protected:
        refer();
        virtual ~refer();

    public:
        long add_ref(void);
        long release(void);
    };


    class json : public refer
    {
        cJSON	*obj_;
        cJSON   *cur_child_;
        cJSON   walk_head_;
        bool    is_array_;

        cJSON* find_sibling(cJSON* first, const char* name, cJSON*** addr);
        cJSON* find_child(cJSON *parent, std::vector<std::string>& path, bool create, cJSON*** addr = NULL);
        cJSON* find(const char* path, bool create = false, cJSON*** addr = NULL);

    protected:
        ~json();

    public:
        json(char* json_txt = 0);

        static std::string to_string(cJSON* root, bool formatted);
        static std::string get_value_as_string(cJSON* root, bool integer = false);
        static void free_node_data(cJSON* node);
        static cJSON* create_element(bool is_array = false);
        static cJSON* create_element_with_name(const char* name);

    public:
        bool attach_text(char* json_txt);
        bool attach_cjson(cJSON* cjson);
        bool create_empty(bool array = false);
        void clear(void);
        std::string to_string(bool formatted);

        // can be path: child/value ...
        bool get_value(const char* key, bool& val);
        bool get_value(const char* key, int& val);
        bool get_value(const char* key, double& val);
        bool get_value(const char* key, std::string& val);
        bool get_value(const char* key, json*& val);		// caller shoud call "delete" to free the returned object !!!
        bool get_value_as_string(const char* key, std::string& val, bool integer);
        bool get_as_array(const char* key, std::vector<std::string>& val);

        bool first_child(std::string& val, std::string* name = NULL);
        bool next_child(std::string& val, std::string* name = NULL);

        bool set_value(const char* key, bool val);
        bool set_value(const char* key, int val);
        bool set_value(const char* key, double val);
        bool set_value(const char* key, std::string val);
        bool set_value(const char* key, const char* val);
        bool set_value(const char* key, json* obj);

        bool change_key(const char* old_key, const char* new_key);
        bool remove(const char* key);
    };

    class base64
    {
        char	base64_ind_[128];
        char	base64_char_[80];
        char    padding_char_;

        bool is_valid_base64_table(const char* table);
        bool initialize_base64_table(const char* table);

    public:
        base64();
        ~base64();

    public:
        bool set_base64_table(const char* table = NULL);
        std::string encode(const char* data, size_t bytes, unsigned int line_bytes = -1, bool need_padding = true);
        std::string decode(const char* data, size_t bytes);
    };

    class sane_config_schm : public refer
    {
        std::string     scheme_name_;
        scanner_cfg     *scanner_;
        std::string     file_;
        json* jsn_;
        json* bkp_;
        json* def_val_;
        bool    in_setting_;
        std::map<int, std::string>  id_name_;       // (id, default-val)

        void clear();
        std::string default_value(const char* name);

    protected:
        ~sane_config_schm();

    public:
        sane_config_schm(scanner_cfg* scanner = nullptr);

        static std::string opt_data_appendix_;
        static bool hex(unsigned char ch, unsigned char* val);
        static bool hex_char(const char* data, unsigned char* val);
        static std::string to_hex_letter(const char* data, size_t bytes);
        static std::string from_hex_letter(const char* data, size_t bytes);
        static bool is_option_data(std::string& name);  // reset baase option name into 'name' if name was option data, and return true

    public:
        sane_config_schm* copy(void);
        bool load_from_file(const char* file);
        bool load_from_mem(const char* mem, bool in_b64 = true);
        bool save_to(const char* file);
        void set_default_value(int sn, const char* name, const char* val, size_t bytes);
        void copy_default_value(sane_config_schm* from);
        bool first_config(std::string& name, std::string& val);
        bool next_config(std::string& name, std::string& val);
        bool get_config(const char* name, std::string& val);
        void begin_setting(bool restore = false);
        void config_changed(const char* name, const char* val, size_t bytes, bool extra = false);
        void config_changed(int sn, const char* val, size_t bytes, bool extra = false);
        void remove_config(const char* name);
        void set_value(const char* name, const char* val, size_t bytes, bool extra = false);
        bool has_changed(void);
        void end_setting(bool cancel);
        int id_from_name(const char* name);
        std::string to_text_stream(bool b64 = true, bool with_ver = true);
        std::string get_version(void);
        std::string get_scheme_name(void);
        void set_scheme_name(const char* name);
        void update(bool(* is_float)(int, void*), void* param, const char*(* t2n)(const char*), std::string* discard = NULL);
    };

    class scanner_cfg : public refer
    {
        // format: in base64
        // 
        // {
        //      "global": {
        //          "ver": "4.33",
        //          "cur": -1
        //      },
        //      "scheme_1": sane_config_schm*,
        //      "scheme_2": sane_config_schm*,
        //      "scheme_3": sane_config_schm*,
        //      ...
        // }
        //
        std::string     path_;
        std::string     scanner_name_;  // scanner type: HUAGOSCAN G100 - 0100
        json            *global_;       // version, current scheme, ...
        
        typedef struct _cfg_schm
        {
            std::string     name;
            sane_config_schm* schm;

            bool operator==(const char* n)
            {
                return name == n;
            }
        }CFGSCHM;
        std::vector<CFGSCHM>    schemes_;

        static std::string global_name_;
        static std::string cur_sel_;
        static std::string default_setting_name_;

        void clear(void);
        void init_version(void);
        void init_select(void);
        void walk_sibling_schemes(cJSON* first);

    protected:
        ~scanner_cfg();

    public:
        scanner_cfg();

        typedef struct _update_func
        {
            void(* trans_number)(const char* name, std::string& val, void* param);
            const char* (* title2name)(const char* title, void* param);
            std::string discard_msg;    // update failed items ...
            void* func_param;
        }UDF, *LPUDF;
        static bool update(const char* file, LPUDF func);

    public:
        int load_file(const char* file);
        int load_mem(const char* mem);
        int save(const char* file = nullptr);

        void get_all_schemes(std::vector<std::string>& schemes);    // return all schemes name queue, the first is always be 'Default settings'
        sane_config_schm* get_scheme(const char* scheme_name = nullptr/*return current scheme if was null*/);   // call sane_config_schm::release() if not use anymore
        std::string get_current_scheme_name(void);
        bool remove_scheme(const char* scheme_name);
        void remove_all_schemes(void);
        bool select_scheme(const char* scheme_name);

        sane_config_schm* copy_scheme(const char* cp_from_name);    // for UI setting, call release() if not use anymore
        bool add_scheme(sane_config_schm* schm, const char* name = nullptr);
        bool rename_scheme(const char* from, const char* to);
    };
};