open62541/include/ua_types.h

/*
 * Copyright (C) 2013-2015 the contributors as stated in the AUTHORS file
 *
 * This file is part of open62541. open62541 is free software: you can
 * redistribute it and/or modify it under the terms of the GNU Lesser General
 * Public License, version 3 (as published by the Free Software Foundation) with
 * a static linking exception as stated in the LICENSE file provided with
 * open62541.
 *
 * open62541 is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

#ifndef UA_TYPES_H_
#define UA_TYPES_H_

#ifdef __cplusplus
extern "C" {
#endif

#ifndef UA_FFI_BINDINGS
#include <stdbool.h>
#include <inttypes.h>
#endif

#include "ua_config.h"
#include "ua_statuscodes.h"

/* Indicates that an array has the length 0 (NULL indicates an non-defined array of length -1)*/
#define UA_EMPTY_ARRAY_SENTINEL ((void*)0x01)

/****************************/
/* Builtin Type Definitions */
/****************************/

#define UA_BUILTIN_TYPES_COUNT 25

/** Boolean: A two-state logical value (true or false) */
typedef bool UA_Boolean;
#define UA_TRUE true
#define UA_FALSE false

/** SByte: An integer value between -128 and 127 */
typedef int8_t UA_SByte;
#define UA_SBYTE_MAX 127
#define UA_SBYTE_MIN (-128)

/** Byte: An integer value between 0 and 256 */
typedef uint8_t UA_Byte;
#define UA_BYTE_MAX 256
#define UA_BYTE_MIN 0

/** Int16: An integer value between -32 768 and 32 767 */
typedef int16_t UA_Int16;
#define UA_INT16_MAX 32767
#define UA_INT16_MIN (-32768)

/** UInt16: An integer value between 0 and 65 535 */
typedef uint16_t UA_UInt16;
#define UA_UINT16_MAX 65535
#define UA_UINT16_MIN 0

/** Int32: An integer value between -2 147 483 648 and 2 147 483 647 */
typedef int32_t UA_Int32;
#define UA_INT32_MAX 2147483647
#define UA_INT32_MIN (-2147483648)

/** UInt32: An integer value between 0 and 4 294 967 295 */
typedef uint32_t UA_UInt32;
#define UA_UINT32_MAX 4294967295
#define UA_UINT32_MIN 0

/* do not use for cryptographic entropy */
UA_EXPORT UA_UInt32 UA_UInt32_random(void);

/** Int64: An integer value between -10 223 372 036 854 775 808 and 9 223 372 036 854 775 807 */
typedef int64_t UA_Int64;
#define UA_INT64_MAX (int64_t)9223372036854775807
#define UA_INT64_MIN ((int64_t)-9223372036854775808)

/** UInt64: An integer value between 0 and 18 446 744 073 709 551 615 */
typedef uint64_t UA_UInt64;
#define UA_UINT64_MAX (int64_t)18446744073709551615
#define UA_UINT64_MIN (int64_t)0

/** Float: An IEEE single precision (32 bit) floating point value */
typedef float UA_Float;

/** Double: An IEEE double precision (64 bit) floating point value */
typedef double UA_Double;

/********************************************/
/* String: A sequence of Unicode characters */
/********************************************/
typedef struct {
    size_t length; // The length of the string
    UA_Byte *data; // The string's content (not null-terminated)
} UA_String;

UA_EXPORT extern const UA_String UA_STRING_NULL;

static UA_INLINE UA_String UA_STRING(char *chars) {
    UA_String str; str.length = strlen(chars);
    str.data = (UA_Byte*)chars; return str; }

#define UA_STRING_ALLOC(CHARS) UA_String_fromChars(CHARS)
    
/** Copies the content on the heap. Returns a null-string when alloc fails */
UA_String UA_EXPORT UA_String_fromChars(char const src[]) UA_FUNC_ATTR_WARN_UNUSED_RESULT;

UA_Boolean UA_EXPORT UA_String_equal(const UA_String *s1, const UA_String *s2);

/*********************************/
/* DateTime: An instance in time */
/*********************************/
/* A DateTime value is encoded as a 64-bit signed integer which represents the
   number of 100 nanosecond intervals since January 1, 1601 (UTC) */
typedef UA_Int64 UA_DateTime;

UA_DateTime UA_EXPORT UA_DateTime_now(void); ///> The current time

typedef struct UA_DateTimeStruct {
    UA_UInt16 nanoSec;
    UA_UInt16 microSec;
    UA_UInt16 milliSec;
    UA_UInt16 sec;
    UA_UInt16 min;
    UA_UInt16 hour;
    UA_UInt16 day;
    UA_UInt16 month;
    UA_UInt16 year;
} UA_DateTimeStruct;

UA_DateTimeStruct UA_EXPORT UA_DateTime_toStruct(UA_DateTime time);

UA_String UA_EXPORT UA_DateTime_toString(UA_DateTime time);

/**************************************************************************/
/* Guid: A 16 byte value that can be used as a globally unique identifier */
/**************************************************************************/
typedef struct {
    UA_UInt32 data1;
    UA_UInt16 data2;
    UA_UInt16 data3;
    UA_Byte   data4[8];
} UA_Guid;

UA_Boolean UA_EXPORT UA_Guid_equal(const UA_Guid *g1, const UA_Guid *g2);

/* do not use for cryptographic entropy */
UA_Guid UA_EXPORT UA_Guid_random(void);

/************************************/
/* ByteString: A sequence of octets */
/************************************/
typedef UA_String UA_ByteString;

static UA_INLINE UA_Boolean UA_ByteString_equal(const UA_ByteString *string1, const UA_ByteString *string2) {
    return UA_String_equal((const UA_String*)string1, (const UA_String*)string2); }

/* Allocates memory of size length for the bytestring. The content is not set to zero. */
UA_StatusCode UA_EXPORT UA_ByteString_allocBuffer(UA_ByteString *bs, size_t length) UA_FUNC_ATTR_WARN_UNUSED_RESULT;

UA_EXPORT extern const UA_ByteString UA_BYTESTRING_NULL;

static UA_INLINE UA_ByteString UA_BYTESTRING(char *chars) {
    UA_ByteString str; str.length = strlen(chars); str.data = (UA_Byte*)chars; return str; }

static UA_INLINE UA_ByteString UA_BYTESTRING_ALLOC(const char *chars) {
    UA_String str = UA_String_fromChars(chars); UA_ByteString bstr;
    bstr.length = str.length; bstr.data = str.data; return bstr;
}

/******************************/
/* XmlElement: An XML element */
/******************************/
typedef UA_String UA_XmlElement;

/*****************************************************************************/
/* NodeId: An identifier for a node in the address space of an OPC UA Server */
/*****************************************************************************/
enum UA_NodeIdType {
    UA_NODEIDTYPE_NUMERIC    = 0, ///< On the wire, this can be 0,1,2 for numeric nodeids of different sizes
    UA_NODEIDTYPE_STRING     = 3,
    UA_NODEIDTYPE_GUID       = 4,
    UA_NODEIDTYPE_BYTESTRING = 5
};

typedef struct {
    UA_UInt16 namespaceIndex;
    enum UA_NodeIdType identifierType;
    union {
        UA_UInt32     numeric;
        UA_String     string;
        UA_Guid       guid;
        UA_ByteString byteString;
    } identifier;
} UA_NodeId;

UA_EXPORT extern const UA_NodeId UA_NODEID_NULL;

static UA_INLINE UA_Boolean UA_NodeId_isNull(const UA_NodeId *p) {
    return (p->namespaceIndex == 0 && p->identifierType == UA_NODEIDTYPE_NUMERIC &&
            p->identifier.numeric == 0);
}

UA_Boolean UA_EXPORT UA_NodeId_equal(const UA_NodeId *n1, const UA_NodeId *n2);

static UA_INLINE UA_NodeId UA_NODEID_NUMERIC(UA_UInt16 nsIndex, UA_Int32 identifier) {
    UA_NodeId id; id.namespaceIndex = nsIndex; id.identifierType = UA_NODEIDTYPE_NUMERIC;
    id.identifier.numeric = identifier; return id; }

static UA_INLINE UA_NodeId UA_NODEID_STRING(UA_UInt16 nsIndex, char *chars) {
    UA_NodeId id; id.namespaceIndex = nsIndex; id.identifierType = UA_NODEIDTYPE_STRING;
    id.identifier.string = UA_STRING(chars); return id; }

static UA_INLINE UA_NodeId UA_NODEID_STRING_ALLOC(UA_UInt16 nsIndex, const char *chars) {
    UA_NodeId id; id.namespaceIndex = nsIndex; id.identifierType = UA_NODEIDTYPE_STRING;
    id.identifier.string = UA_STRING_ALLOC(chars); return id; }

static UA_INLINE UA_NodeId UA_NODEID_GUID(UA_UInt16 nsIndex, UA_Guid guid) {
    UA_NodeId id; id.namespaceIndex = nsIndex; id.identifierType = UA_NODEIDTYPE_GUID;
    id.identifier.guid = guid; return id; }

static UA_INLINE UA_NodeId UA_NODEID_BYTESTRING(UA_UInt16 nsIndex, char *chars) {
    UA_NodeId id; id.namespaceIndex = nsIndex; id.identifierType = UA_NODEIDTYPE_BYTESTRING;
    id.identifier.byteString = UA_BYTESTRING(chars); return id; }

static UA_INLINE UA_NodeId UA_NODEID_BYTESTRING_ALLOC(UA_UInt16 nsIndex, const char *chars) {
    UA_NodeId id; id.namespaceIndex = nsIndex; id.identifierType = UA_NODEIDTYPE_BYTESTRING;
    id.identifier.byteString = UA_BYTESTRING_ALLOC(chars); return id; }

/**********************************************************************************************/
/* ExpandedNodeId: A NodeId that allows the namespace URI to be specified instead of an index */
/**********************************************************************************************/
typedef struct {
    UA_NodeId nodeId;
    UA_String namespaceUri;
    UA_UInt32 serverIndex;
} UA_ExpandedNodeId;

static UA_INLINE UA_ExpandedNodeId UA_EXPANDEDNODEID_NUMERIC(UA_UInt16 nsIndex, UA_Int32 identifier) {
    UA_ExpandedNodeId id; id.nodeId = UA_NODEID_NUMERIC(nsIndex, identifier);
    id.serverIndex = 0; id.namespaceUri = UA_STRING_NULL; return id; }

static UA_INLINE UA_ExpandedNodeId UA_EXPANDEDNODEID_STRING(UA_UInt16 nsIndex, char *chars) {
    UA_ExpandedNodeId id; id.nodeId = UA_NODEID_STRING(nsIndex, chars);
    id.serverIndex = 0; id.namespaceUri = UA_STRING_NULL; return id; }

static UA_INLINE UA_ExpandedNodeId UA_EXPANDEDNODEID_STRING_ALLOC(UA_UInt16 nsIndex, const char *chars) {
    UA_ExpandedNodeId id; id.nodeId = UA_NODEID_STRING_ALLOC(nsIndex, chars);
    id.serverIndex = 0; id.namespaceUri = UA_STRING_NULL; return id; }

static UA_INLINE UA_ExpandedNodeId UA_EXPANDEDNODEID_STRING_GUID(UA_UInt16 nsIndex, UA_Guid guid) {
    UA_ExpandedNodeId id; id.nodeId = UA_NODEID_GUID(nsIndex, guid);
    id.serverIndex = 0; id.namespaceUri = UA_STRING_NULL; return id; }

static UA_INLINE UA_ExpandedNodeId UA_EXPANDEDNODEID_BYTESTRING(UA_UInt16 nsIndex, char *chars) {
    UA_ExpandedNodeId id; id.nodeId = UA_NODEID_BYTESTRING(nsIndex, chars);
    id.serverIndex = 0; id.namespaceUri = UA_STRING_NULL; return id; }

static UA_INLINE UA_ExpandedNodeId UA_EXPANDEDNODEID_BYTESTRING_ALLOC(UA_UInt16 nsIndex, const char *chars) {
    UA_ExpandedNodeId id; id.nodeId = UA_NODEID_BYTESTRING_ALLOC(nsIndex, chars);
    id.serverIndex = 0; id.namespaceUri = UA_STRING_NULL; return id; }

/**************************************************/
/* QualifiedName: A name qualified by a namespace */
/**************************************************/
typedef struct {
    UA_UInt16 namespaceIndex;
    UA_String name;
} UA_QualifiedName;

static UA_INLINE UA_QualifiedName UA_QUALIFIEDNAME(UA_UInt16 nsIndex, char *chars) {
    UA_QualifiedName qn; qn.namespaceIndex = nsIndex; qn.name = UA_STRING(chars); return qn; }

static UA_INLINE UA_QualifiedName UA_QUALIFIEDNAME_ALLOC(UA_UInt16 nsIndex, const char *chars) {
    UA_QualifiedName qn; qn.namespaceIndex = nsIndex; qn.name = UA_STRING_ALLOC(chars); return qn; }

/*************************************************************************/
/* LocalizedText: Human readable text with an optional locale identifier */
/*************************************************************************/
typedef struct {
    UA_String locale;
    UA_String text;
} UA_LocalizedText;

static UA_INLINE UA_LocalizedText UA_LOCALIZEDTEXT(char *locale, char *text) {
    UA_LocalizedText lt; lt.locale = UA_STRING(locale);
    lt.text = UA_STRING(text); return lt; }

static UA_INLINE UA_LocalizedText UA_LOCALIZEDTEXT_ALLOC(const char *locale, const char *text) {
    UA_LocalizedText lt; lt.locale = UA_STRING_ALLOC(locale);
    lt.text = UA_STRING_ALLOC(text); return lt; }

/* Forward Declaration of UA_DataType */
struct UA_DataType;
typedef struct UA_DataType UA_DataType; 

/********************************************************************************/
/* ExtensionObject: A structure that contains an application specific data type */
/* that may not be recognized by the receiver                                   */
/********************************************************************************/
typedef struct {
    enum {
        UA_EXTENSIONOBJECT_ENCODED_NOBODY     = 0,
        UA_EXTENSIONOBJECT_ENCODED_BYTESTRING = 1,
        UA_EXTENSIONOBJECT_ENCODED_XML        = 2,
        UA_EXTENSIONOBJECT_DECODED            = 3, ///< There is a pointer to the decoded data
        UA_EXTENSIONOBJECT_DECODED_NODELETE   = 4  ///< Don't delete the decoded data at the lifecycle end
    } encoding;
    union {
        struct {
            UA_NodeId typeId; ///< The nodeid of the datatype
            UA_ByteString body; ///< The bytestring of the encoded data
        } encoded;
        struct {
            const UA_DataType *type;
            void *data;
        } decoded;
    } content;
} UA_ExtensionObject;

/*********************************************/
/* Variant: Stores (arrays of) any data type */
/*********************************************/
 /* Variant semantics:
    - arrayLength == 0 && data == NULL: no existing data
    - arrayLength == 0 && data == 0x01: array of length 0
    - arrayLength == 0 && data > 0x01: scalar value
    - arrayLength > 0: array of the given length
 */
typedef struct {
    const UA_DataType *type; // The data type description
    enum {
        UA_VARIANT_DATA,          /* The data has the same lifecycle as the variant */
        UA_VARIANT_DATA_NODELETE, /* The data is "borrowed" by the variant and shall not be
                                     deleted at the end of the variant's lifecycle. */
    } storageType;
    size_t arrayLength;  // The number of elements in the data array
    void *data; // Points to the scalar or array data
    size_t arrayDimensionsSize; // The number of dimensions the data-array has
    UA_UInt32 *arrayDimensions; // The length of each dimension of the data-array
} UA_Variant;

/**
 * Returns true if the variant contains a scalar value. Note that empty variants contain an array of
 * length -1 (undefined).
 *
 * @param v The variant
 * @return Does the variant contain a scalar value.
 */
static UA_INLINE UA_Boolean UA_Variant_isScalar(const UA_Variant *v) {
    return (v->arrayLength == 0 && v->data > UA_EMPTY_ARRAY_SENTINEL); }
    
/**
 * Set the variant to a scalar value that already resides in memory. The value takes on the
 * lifecycle of the variant and is deleted with it.
 *
 * @param v The variant
 * @param p A pointer to the value data
 * @param type The datatype of the value in question
 */
void UA_EXPORT UA_Variant_setScalar(UA_Variant *v, void * UA_RESTRICT p, const UA_DataType *type);

/**
 * Set the variant to a scalar value that is copied from an existing variable.
 *
 * @param v The variant
 * @param p A pointer to the value data
 * @param type The datatype of the value
 * @return Indicates whether the operation succeeded or returns an error code
 */
UA_StatusCode UA_EXPORT UA_Variant_setScalarCopy(UA_Variant *v, const void *p, const UA_DataType *type);

/**
 * Set the variant to an array that already resides in memory. The array takes on the lifecycle of
 * the variant and is deleted with it.
 *
 * @param v The variant
 * @param array A pointer to the array data
 * @param arraySize The size of the array
 * @param type The datatype of the array
 */
void UA_EXPORT
UA_Variant_setArray(UA_Variant *v, void * UA_RESTRICT array, size_t arraySize, const UA_DataType *type);

/**
 * Set the variant to an array that is copied from an existing array.
 *
 * @param v The variant
 * @param array A pointer to the array data
 * @param arraySize The size of the array
 * @param type The datatype of the array
 * @return Indicates whether the operation succeeded or returns an error code
 */
UA_StatusCode UA_EXPORT
UA_Variant_setArrayCopy(UA_Variant *v, const void *array, size_t arraySize, const UA_DataType *type);

/* NumericRanges are used to indicate subsets of a (multidimensional) variant
 * array. NumericRange has no official type structure in the standard. On the
 * wire, it only exists as an encoded string, such as "1:2,0:3,5". The colon
 * separates min/max index and the comma separates dimensions. A single value
 * indicates a range with a single element (min==max). */
typedef struct {
    size_t dimensionsSize;
    struct UA_NumericRangeDimension {
        UA_UInt32 min;
        UA_UInt32 max;
    } *dimensions;
} UA_NumericRange;

/**
 * Copy the variant, but use only a subset of the (multidimensional) array into a variant. Returns
 * an error code if the variant is not an array or if the indicated range does not fit.
 *
 * @param src The source variant
 * @param dst The target variant
 * @param range The range of the copied data
 * @return Returns UA_STATUSCODE_GOOD or an error code
 */
UA_StatusCode UA_EXPORT
UA_Variant_copyRange(const UA_Variant *src, UA_Variant *dst, const UA_NumericRange range);

/**
 * Insert a range of data into an existing variant. The data array can't be reused afterwards if it
 * contains types without a fixed size (e.g. strings) since the members are moved into the variant
 * and take on its lifecycle.
 *
 * @param v The variant
 * @param dataArray The data array. The type must match the variant
 * @param dataArraySize The length of the data array. This is checked to match the range size.
 * @param range The range of where the new data is inserted
 * @return Returns UA_STATUSCODE_GOOD or an error code
 */
UA_StatusCode UA_EXPORT
UA_Variant_setRange(UA_Variant *v, void * UA_RESTRICT array, size_t arraySize, const UA_NumericRange range);

/**
 * Deep-copy a range of data into an existing variant.
 *
 * @param v The variant
 * @param dataArray The data array. The type must match the variant
 * @param dataArraySize The length of the data array. This is checked to match the range size.
 * @param range The range of where the new data is inserted
 * @return Returns UA_STATUSCODE_GOOD or an error code
 */
UA_StatusCode UA_EXPORT
UA_Variant_setRangeCopy(UA_Variant *v, const void *array, size_t arraySize, const UA_NumericRange range);

/**************************************************************************/
/* DataValue: A data value with an associated status code and timestamps. */
/**************************************************************************/
typedef struct {
    UA_Boolean    hasValue             : 1;
    UA_Boolean    hasStatus            : 1;
    UA_Boolean    hasSourceTimestamp   : 1;
    UA_Boolean    hasServerTimestamp   : 1;
    UA_Boolean    hasSourcePicoseconds : 1;
    UA_Boolean    hasServerPicoseconds : 1;
    UA_Variant    value;
    UA_StatusCode status;
    UA_DateTime   sourceTimestamp;
    UA_Int16      sourcePicoseconds;
    UA_DateTime   serverTimestamp;
    UA_Int16      serverPicoseconds;
} UA_DataValue;

/***************************************************************************/
/* DiagnosticInfo: A structure that contains detailed error and diagnostic */
/* information associated with a StatusCode.                               */
/***************************************************************************/
typedef struct UA_DiagnosticInfo {
    UA_Boolean    hasSymbolicId          : 1;
    UA_Boolean    hasNamespaceUri        : 1;
    UA_Boolean    hasLocalizedText       : 1;
    UA_Boolean    hasLocale              : 1;
    UA_Boolean    hasAdditionalInfo      : 1;
    UA_Boolean    hasInnerStatusCode     : 1;
    UA_Boolean    hasInnerDiagnosticInfo : 1;
    UA_Int32      symbolicId;
    UA_Int32      namespaceUri;
    UA_Int32      localizedText;
    UA_Int32      locale;
    UA_String     additionalInfo;
    UA_StatusCode innerStatusCode;
    struct UA_DiagnosticInfo *innerDiagnosticInfo;
} UA_DiagnosticInfo;

/*************************/
/* Generic Type Handling */
/*************************/

#define UA_MAX_TYPE_MEMBERS 13 // Maximum number of members per structured type

typedef struct {
#ifdef ENABLE_TYPEINTROSPECTION
    const char *memberName;
#endif
    UA_UInt16   memberTypeIndex;   ///< Index of the member in the datatypetable
    UA_Byte     padding;           /**< How much padding is there before this member element? For arrays this is
                                        split into 2 bytes padding before the length index (max 4 bytes) and 3
                                        bytes padding before the pointer (max 8 bytes) */
    UA_Boolean  namespaceZero : 1; /**< The type of the member is defined in namespace zero. In this
                                        implementation, types from custom namespace may contain
                                        members from the same namespace or ns0 only.*/
    UA_Boolean  isArray       : 1; ///< The member is an array of the given type
} UA_DataTypeMember;
    
struct UA_DataType {
#ifdef ENABLE_TYPEINTROSPECTION
    const char *typeName;
#endif
    UA_NodeId   typeId;           ///< The nodeid of the type
    UA_UInt16   memSize;          ///< Size of the struct in memory
    UA_UInt16   typeIndex;        ///< Index of the type in the datatypetable
    UA_Byte     membersSize;      ///< How many members does the type have?
    UA_Boolean  builtin      : 1; ///< The type is "builtin" and has dedicated de- and encoding functions
    UA_Boolean  fixedSize    : 1; ///< The type (and its members) contains no pointers
    UA_Boolean  zeroCopyable : 1; ///< The type can be copied directly off the stream (given that the endianness matches)
    UA_DataTypeMember members[UA_MAX_TYPE_MEMBERS];
};

/**
 * Allocates and initializes a variable of type dataType
 *
 * @param type The datatype description
 * @return Returns the memory location of the variable or (void*)0 if no memory is available
 */
void UA_EXPORT * UA_new(const UA_DataType *type) UA_FUNC_ATTR_MALLOC;

/**
 * Initializes a variable to default values
 *
 * @param p The memory location of the variable
 * @param type The datatype description
 */
static UA_INLINE void UA_init(void *p, const UA_DataType *type) {
    memset(p, 0, type->memSize); }

/**
 * Copies the content of two variables. If copying fails (e.g. because no memory was available for
 * an array), then dst is emptied and initialized to prevent memory leaks.
 *
 * @param src The memory location of the source variable
 * @param dst The memory location of the destination variable
 * @param type The datatype description
 * @return Indicates whether the operation succeeded or returns an error code
 */
UA_StatusCode UA_EXPORT
UA_copy(const void *src, void *dst, const UA_DataType *type) UA_FUNC_ATTR_WARN_UNUSED_RESULT;

/**
 * Deletes the dynamically assigned content of a variable (e.g. a member-array).
 * Afterwards, the variable can be safely deleted without causing memory leaks.
 * But the variable is not initialized and may contain old data that is not
 * memory-relevant.
 *
 * @param p The memory location of the variable
 * @param type The datatype description of the variable
 */
void UA_EXPORT UA_deleteMembers(void *p, const UA_DataType *type);

/**
 * Deletes (frees) a variable and all of its content.
 *
 * @param p The memory location of the variable
 * @param type The datatype description of the variable
 */
void UA_EXPORT UA_delete(void *p, const UA_DataType *type);

/********************/
/* Array operations */
/********************/

#define MAX_ARRAY_SIZE 104857600 // arrays must be smaller than 100MB

/**
 * Allocates and initializes an array of variables of a specific type
 *
 * @param size The requested array length
 * @param type The datatype description
 * @return Returns the memory location of the variable or (void*)0 if no memory could be allocated
 */
void UA_EXPORT * UA_Array_new(size_t size, const UA_DataType *type) UA_FUNC_ATTR_MALLOC;

/**
 * Allocates and copies an array. dst is set to (void*)0 if not enough memory is available.
 *
 * @param src The memory location of the source array
 * @param src_size The size of the array
 * @param dst The location of the pointer to the new array
 * @param type The datatype of the array members
 * @return Returns whether copying succeeded
 */
UA_StatusCode UA_EXPORT
UA_Array_copy(const void *src, size_t src_size, void **dst,
              const UA_DataType *type) UA_FUNC_ATTR_WARN_UNUSED_RESULT;

/**
 * Deletes an array.
 *
 * @param p The memory location of the array
 * @param size The size of the array
 * @param type The datatype of the array members
 */
void UA_EXPORT UA_Array_delete(void *p, size_t size, const UA_DataType *type);

/**********************/
/* Node Attribute Ids */
/**********************/

/* These are not generated from XML. Server *and* client need them. */
typedef enum {
    UA_ATTRIBUTEID_NODEID                  = 1,
    UA_ATTRIBUTEID_NODECLASS               = 2,
    UA_ATTRIBUTEID_BROWSENAME              = 3,
    UA_ATTRIBUTEID_DISPLAYNAME             = 4,
    UA_ATTRIBUTEID_DESCRIPTION             = 5,
    UA_ATTRIBUTEID_WRITEMASK               = 6,
    UA_ATTRIBUTEID_USERWRITEMASK           = 7,
    UA_ATTRIBUTEID_ISABSTRACT              = 8,
    UA_ATTRIBUTEID_SYMMETRIC               = 9,
    UA_ATTRIBUTEID_INVERSENAME             = 10,
    UA_ATTRIBUTEID_CONTAINSNOLOOPS         = 11,
    UA_ATTRIBUTEID_EVENTNOTIFIER           = 12,
    UA_ATTRIBUTEID_VALUE                   = 13,
    UA_ATTRIBUTEID_DATATYPE                = 14,
    UA_ATTRIBUTEID_VALUERANK               = 15,
    UA_ATTRIBUTEID_ARRAYDIMENSIONS         = 16,
    UA_ATTRIBUTEID_ACCESSLEVEL             = 17,
    UA_ATTRIBUTEID_USERACCESSLEVEL         = 18,
    UA_ATTRIBUTEID_MINIMUMSAMPLINGINTERVAL = 19,
    UA_ATTRIBUTEID_HISTORIZING             = 20,
    UA_ATTRIBUTEID_EXECUTABLE              = 21,
    UA_ATTRIBUTEID_USEREXECUTABLE          = 22
} UA_AttributeId;

typedef enum {
    UA_ACCESSLEVELMASK_READ = 0x01,
    UA_ACCESSLEVELMASK_WRITE = 0x02,
    UA_ACCESSLEVELMASK_HISTORYREAD = 0x4,
    UA_ACCESSLEVELMASK_HISTORYWRITE = 0x08,
    UA_ACCESSLEVELMASK_SEMANTICCHANGE = 0x10
} UA_AccessLevelMask;

/***************************/
/* Random Number Generator */
/***************************/

/**
 * If UA_MULTITHREADING is enabled, then the seed is stored in thread local storage. The seed is
 * initialized for every thread in the server/client.
 */
UA_EXPORT void UA_random_seed(UA_UInt64 seed);

#ifdef __cplusplus
} // extern "C"
#endif

#endif /* UA_TYPES_H_ */