bencode.h

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/*
 * Copyright (c) 2020 naturalpolice
 * SPDX-License-Identifier: MIT
 *
 * Licensed under the MIT License (see LICENSE).
 */

#ifndef DHT_BENCODE_H_
#define DHT_BENCODE_H_

#ifdef __cplusplus
extern "C" {
#endif

#include <stdio.h>

struct bvalue {
    enum {
        BVALUE_INTEGER,
        BVALUE_STRING,
        BVALUE_LIST,
        BVALUE_DICTIONARY,
    } type;
    union {
        long long int i;
        struct {
            unsigned char *bytes;   
            size_t len;             
        } s;
        struct {
            struct bvalue **array;  
            size_t len;             
        } l;
        struct {
            char **key;             
            struct bvalue **val;    
            size_t len;             
        } d;
    };
};

struct bvalue *bvalue_new_dict(void);
struct bvalue *bvalue_new_list(void);
struct bvalue *bvalue_new_integer(long long int i);
struct bvalue *bvalue_new_string(const unsigned char *s, size_t len);
struct bvalue *bvalue_copy(const struct bvalue *val);
void bvalue_free(struct bvalue *val);

int bvalue_list_append(struct bvalue *list, struct bvalue *val);
int bvalue_dict_set(struct bvalue *dict, const char *key, struct bvalue *val);

const struct bvalue *bvalue_dict_get(const struct bvalue *dict, const char *key);
const struct bvalue *bvalue_list_get(const struct bvalue *list, size_t pos);
const unsigned char *bvalue_string(const struct bvalue *val, size_t *len);
int bvalue_integer(const struct bvalue *val, int *intval);
int bvalue_integer_l(const struct bvalue *val, long int *intval);
int bvalue_integer_ll(const struct bvalue *val, long long int *intval);

struct bvalue *bdecode_file(FILE *stream);
int bencode_file(const struct bvalue *val, FILE *stream);

struct bvalue *bdecode_buf(const unsigned char *buf, size_t len);
int bencode_buf(const struct bvalue *val, unsigned char *buf, size_t len);
int bencode_buf_alloc(const struct bvalue *val, unsigned char **bufp);

#ifdef __cplusplus
}
#endif

#endif /* BENCODE_H_ */