data.h

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/*
 * Copyright (c) 2014-2017 Pavel Kalvoda <me@pavelkalvoda.com>
 *
 * libcbor is free software; you can redistribute it and/or modify
 * it under the terms of the MIT license. See LICENSE for details.
 */

#ifndef LIBCBOR_DATA_H
#define LIBCBOR_DATA_H

#include <stdlib.h>
#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>

#ifdef __cplusplus
extern "C" {
#endif

typedef const unsigned char * cbor_data;
typedef unsigned char * cbor_mutable_data;

typedef enum cbor_type {
    CBOR_TYPE_UINT         
    ,CBOR_TYPE_NEGINT      
    ,CBOR_TYPE_BYTESTRING  
    ,CBOR_TYPE_STRING      
    ,CBOR_TYPE_ARRAY       
    ,CBOR_TYPE_MAP         
    ,CBOR_TYPE_TAG         
    ,CBOR_TYPE_FLOAT_CTRL  
} cbor_type;

typedef enum {
    CBOR_ERR_NONE
    ,CBOR_ERR_NOTENOUGHDATA
    ,CBOR_ERR_NODATA
    ,CBOR_ERR_MALFORMATED
    ,CBOR_ERR_MEMERROR      
    ,CBOR_ERR_SYNTAXERROR   
} cbor_error_code;

typedef enum {
    CBOR_INT_8
    ,CBOR_INT_16
    ,CBOR_INT_32
    ,CBOR_INT_64
} cbor_int_width;

typedef enum {
    CBOR_FLOAT_0       
    ,CBOR_FLOAT_16     
    ,CBOR_FLOAT_32     
    ,CBOR_FLOAT_64     
} cbor_float_width;

typedef enum {
    _CBOR_METADATA_DEFINITE
    ,_CBOR_METADATA_INDEFINITE
} _cbor_dst_metadata;

typedef enum {
    CBOR_CTRL_NONE = 0,
    CBOR_CTRL_FALSE = 20,
    CBOR_CTRL_TRUE = 21,
    CBOR_CTRL_NULL = 22,
    CBOR_CTRL_UNDEF = 23
} _cbor_ctrl;

struct _cbor_int_metadata {
    cbor_int_width width;
};

struct _cbor_bytestring_metadata {
    size_t length;
    _cbor_dst_metadata type;
};

struct _cbor_string_metadata {
    size_t             length;
    size_t             codepoint_count; /* Sum of chunks' codepoint_counts for indefinite strings */
    _cbor_dst_metadata type;
};

struct _cbor_array_metadata {
    size_t             allocated;
    size_t             end_ptr;
    _cbor_dst_metadata type;
};

struct _cbor_map_metadata {
    size_t             allocated;
    size_t             end_ptr;
    _cbor_dst_metadata type;
};

struct _cbor_tag_metadata {
    struct cbor_item_t * tagged_item;
    uint64_t             value;
};

struct _cbor_float_ctrl_metadata {
    cbor_float_width width;
    uint8_t          ctrl;
};

union _cbor_float_helper {
    float    as_float;
    uint32_t as_uint;
};

union _cbor_double_helper {
    double   as_double;
    uint64_t as_uint;
};

union cbor_item_metadata {
    struct _cbor_int_metadata        int_metadata;
    struct _cbor_bytestring_metadata bytestring_metadata;
    struct _cbor_string_metadata     string_metadata;
    struct _cbor_array_metadata      array_metadata;
    struct _cbor_map_metadata        map_metadata;
    struct _cbor_tag_metadata        tag_metadata;
    struct _cbor_float_ctrl_metadata float_ctrl_metadata;
};

typedef struct cbor_item_t {
    union cbor_item_metadata metadata;
    size_t                   refcount;
    cbor_type                type;
    unsigned char *          data;
} cbor_item_t;

struct cbor_indefinite_string_data {
    size_t          chunk_count;
    size_t          chunk_capacity;
    cbor_item_t * * chunks;
};

struct cbor_error {
    size_t          position;
    cbor_error_code code;
};

struct cbor_pair {
    cbor_item_t * key, * value;
};

struct cbor_load_result {
    struct cbor_error error;
    size_t            read;
};


enum cbor_decoder_status {
    CBOR_DECODER_FINISHED       
    ,CBOR_DECODER_NEDATA        
    ,CBOR_DECODER_EBUFFER       
    ,CBOR_DECODER_ERROR         
};

struct cbor_decoder_result {
    size_t                   read;
    enum cbor_decoder_status status;
};

#ifdef __cplusplus
}
#endif

#endif //LIBCBOR_DATA_H