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/*
* Copyright (c) 2014-2020 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_COMMON_H
#define LIBCBOR_COMMON_H
#include <assert.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include "cbor/cbor_export.h"
#include "cbor/configuration.h"
#include "data.h"
#ifdef __cplusplus
extern "C" {
/**
* C99 is not a subset of C++ -- 'restrict' qualifier is not a part of the
* language. This is a workaround to keep it in C headers -- compilers allow
* linking non-restrict signatures with restrict implementations.
*
* If you know a nicer way, please do let me know.
*/
#define CBOR_RESTRICT_POINTER
#else
// MSVC + C++ workaround
#define CBOR_RESTRICT_POINTER CBOR_RESTRICT_SPECIFIER
#endif
static const uint8_t cbor_major_version = CBOR_MAJOR_VERSION;
static const uint8_t cbor_minor_version = CBOR_MINOR_VERSION;
static const uint8_t cbor_patch_version = CBOR_PATCH_VERSION;
#define CBOR_VERSION \
_CBOR_TO_STR(CBOR_MAJOR_VERSION) \
"." _CBOR_TO_STR(CBOR_MINOR_VERSION) "." _CBOR_TO_STR(CBOR_PATCH_VERSION)
#define CBOR_HEX_VERSION \
((CBOR_MAJOR_VERSION << 16) | (CBOR_MINOR_VERSION << 8) | CBOR_PATCH_VERSION)
/* http://stackoverflow.com/questions/1644868/c-define-macro-for-debug-printing
*/
#ifdef DEBUG
#include <stdio.h>
#define _cbor_debug_print(fmt, ...) \
do { \
if (DEBUG) \
fprintf(stderr, "%s:%d:%s(): " fmt, __FILE__, __LINE__, __func__, \
__VA_ARGS__); \
} while (0)
extern bool _cbor_enable_assert;
// Like `assert`, but can be dynamically disabled in tests to allow testing
// invalid behaviors.
#define CBOR_ASSERT(e) assert(!_cbor_enable_assert || (e))
#define _CBOR_TEST_DISABLE_ASSERT(block) \
do { \
_cbor_enable_assert = false; \
block _cbor_enable_assert = true; \
} while (0)
#else
#define debug_print(fmt, ...) \
do { \
} while (0)
#define CBOR_ASSERT(e)
#define _CBOR_TEST_DISABLE_ASSERT(block) \
do { \
block \
} while (0)
#endif
#define _CBOR_TO_STR_(x) #x
#define _CBOR_TO_STR(x) _CBOR_TO_STR_(x) /* enables proper double expansion */
#ifdef __GNUC__
#define _CBOR_UNUSED(x) __attribute__((__unused__)) x
// TODO(https://github.com/PJK/libcbor/issues/247): Prefer [[nodiscard]] if
// available
#define _CBOR_NODISCARD __attribute__((warn_unused_result))
#elif defined(_MSC_VER)
#define _CBOR_UNUSED(x) __pragma(warning(suppress : 4100 4101)) x
#define _CBOR_NODISCARD
#else
#define _CBOR_UNUSED(x) x
#define _CBOR_NODISCARD
#endif
typedef void *(*_cbor_malloc_t)(size_t);
typedef void *(*_cbor_realloc_t)(void *, size_t);
typedef void (*_cbor_free_t)(void *);
CBOR_EXPORT extern _cbor_malloc_t _cbor_malloc;
CBOR_EXPORT extern _cbor_realloc_t _cbor_realloc;
CBOR_EXPORT extern _cbor_free_t _cbor_free;
// Macro to short-circuit builder functions when memory allocation fails
#define _CBOR_NOTNULL(cbor_item) \
do { \
if (cbor_item == NULL) { \
return NULL; \
} \
} while (0)
// Macro to short-circuit builders when memory allocation of nested data fails
#define _CBOR_DEPENDENT_NOTNULL(cbor_item, pointer) \
do { \
if (pointer == NULL) { \
_cbor_free(cbor_item); \
return NULL; \
} \
} while (0)
/** Sets the memory management routines to use.
*
* By default, libcbor will use the standard library `malloc`, `realloc`, and
* `free`.
*
* \rst
* .. warning:: This function modifies the global state and should therefore be
* used accordingly. Changing the memory handlers while allocated items exist
* will result in a ``free``/``malloc`` mismatch. This function is not thread
* safe with respect to both itself and all the other *libcbor* functions that
* work with the heap.
*
* .. note:: `realloc` implementation must correctly support `NULL` reallocation
* (see e.g. http://en.cppreference.com/w/c/memory/realloc)
* \endrst
*
* @param custom_malloc malloc implementation
* @param custom_realloc realloc implementation
* @param custom_free free implementation
*/
CBOR_EXPORT void cbor_set_allocs(_cbor_malloc_t custom_malloc,
_cbor_realloc_t custom_realloc,
_cbor_free_t custom_free);
/*
* ============================================================================
* Type manipulation
* ============================================================================
*/
/** Get the type of the item
*
* @param item
* @return The type
*/
_CBOR_NODISCARD
CBOR_EXPORT cbor_type cbor_typeof(
const cbor_item_t *item); /* Will be inlined iff link-time opt is enabled */
/* Standard CBOR Major item types */
/** Does the item have the appropriate major type?
* @param item the item
* @return Is the item an #CBOR_TYPE_UINT?
*/
_CBOR_NODISCARD
CBOR_EXPORT bool cbor_isa_uint(const cbor_item_t *item);
/** Does the item have the appropriate major type?
* @param item the item
* @return Is the item a #CBOR_TYPE_NEGINT?
*/
_CBOR_NODISCARD
CBOR_EXPORT bool cbor_isa_negint(const cbor_item_t *item);
/** Does the item have the appropriate major type?
* @param item the item
* @return Is the item a #CBOR_TYPE_BYTESTRING?
*/
_CBOR_NODISCARD
CBOR_EXPORT bool cbor_isa_bytestring(const cbor_item_t *item);
/** Does the item have the appropriate major type?
* @param item the item
* @return Is the item a #CBOR_TYPE_STRING?
*/
_CBOR_NODISCARD
CBOR_EXPORT bool cbor_isa_string(const cbor_item_t *item);
/** Does the item have the appropriate major type?
* @param item the item
* @return Is the item an #CBOR_TYPE_ARRAY?
*/
_CBOR_NODISCARD
CBOR_EXPORT bool cbor_isa_array(const cbor_item_t *item);
/** Does the item have the appropriate major type?
* @param item the item
* @return Is the item a #CBOR_TYPE_MAP?
*/
_CBOR_NODISCARD
CBOR_EXPORT bool cbor_isa_map(const cbor_item_t *item);
/** Does the item have the appropriate major type?
* @param item the item
* @return Is the item a #CBOR_TYPE_TAG?
*/
_CBOR_NODISCARD
CBOR_EXPORT bool cbor_isa_tag(const cbor_item_t *item);
/** Does the item have the appropriate major type?
* @param item the item
* @return Is the item a #CBOR_TYPE_FLOAT_CTRL?
*/
_CBOR_NODISCARD
CBOR_EXPORT bool cbor_isa_float_ctrl(const cbor_item_t *item);
/* Practical types with respect to their semantics (but not tag values) */
/** Is the item an integer, either positive or negative?
* @param item the item
* @return Is the item an integer, either positive or negative?
*/
_CBOR_NODISCARD
CBOR_EXPORT bool cbor_is_int(const cbor_item_t *item);
/** Is the item an a floating point number?
* @param item the item
* @return Is the item a floating point number?
*/
_CBOR_NODISCARD
CBOR_EXPORT bool cbor_is_float(const cbor_item_t *item);
/** Is the item an a boolean?
* @param item the item
* @return Is the item a boolean?
*/
_CBOR_NODISCARD
CBOR_EXPORT bool cbor_is_bool(const cbor_item_t *item);
/** Does this item represent `null`
*
* \rst
* .. warning:: This is in no way related to the value of the pointer. Passing a
* null pointer will most likely result in a crash.
* \endrst
*
* @param item the item
* @return Is the item (CBOR logical) null?
*/
_CBOR_NODISCARD
CBOR_EXPORT bool cbor_is_null(const cbor_item_t *item);
/** Does this item represent `undefined`
*
* \rst
* .. warning:: Care must be taken to distinguish nulls and undefined values in
* C.
* \endrst
*
* @param item the item
* @return Is the item (CBOR logical) undefined?
*/
_CBOR_NODISCARD
CBOR_EXPORT bool cbor_is_undef(const cbor_item_t *item);
/*
* ============================================================================
* Memory management
* ============================================================================
*/
/** Increases the item's reference count by one
*
* Constant complexity; items referring to this one or items being referred to
* are not updated.
*
* This function can be used to extend reference counting to client code.
*
* @param item Reference to an item
* @return The input \p item
*/
CBOR_EXPORT cbor_item_t *cbor_incref(cbor_item_t *item);
/** Decreases the item's reference count by one, deallocating the item if needed
*
* In case the item is deallocated, the reference count of all items this item
* references will also be #cbor_decref 'ed recursively.
*
* @param item Reference to an item. Will be set to `NULL` if deallocated
*/
CBOR_EXPORT void cbor_decref(cbor_item_t **item);
/** Decreases the item's reference count by one, deallocating the item if needed
*
* Convenience wrapper for #cbor_decref when its set-to-null behavior is not
* needed
*
* @param item Reference to an item
*/
CBOR_EXPORT void cbor_intermediate_decref(cbor_item_t *item);
/** Get the item's reference count
*
* \rst
* .. warning:: This does *not* account for transitive references.
* \endrst
*
* @todo Add some inline examples for reference counting
*
* @param item the item
* @return the reference count
*/
_CBOR_NODISCARD
CBOR_EXPORT size_t cbor_refcount(const cbor_item_t *item);
/** Provides CPP-like move construct
*
* Decreases the reference count by one, but does not deallocate the item even
* if its refcount reaches zero. This is useful for passing intermediate values
* to functions that increase reference count. Should only be used with
* functions that `incref` their arguments.
*
* \rst
* .. warning:: If the item is moved without correctly increasing the reference
* count afterwards, the memory will be leaked.
* \endrst
*
* @param item Reference to an item
* @return the item with reference count decreased by one
*/
_CBOR_NODISCARD
CBOR_EXPORT cbor_item_t *cbor_move(cbor_item_t *item);
#ifdef __cplusplus
}
#endif
#endif // LIBCBOR_COMMON_H
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