Value.c

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/*
 * Objectively: Ultra-lightweight object oriented framework for GNU C.
 * Copyright (C) 2014 Jay Dolan <jay@jaydolan.com>
 *
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 * claim that you wrote the original software. If you use this software
 * in a product, an acknowledgment in the product documentation would be
 * appreciated but is not required.
 *
 * 2. Altered source versions must be plainly marked as such, and must not be
 * misrepresented as being the original software.
 *
 * 3. This notice may not be removed or altered from any source distribution.
 */
 
#include <assert.h>
#include <stdlib.h>
#include <string.h>
 
#include "Hash.h"
#include "Value.h"
 
#define _Class _Value
 
#pragma mark - Object
 
static void dealloc(Object *self) {
 
    Value *this = (Value *) self;
 
    if (this->destructor) {
        this->destructor(this->value);
    }
 
    super(Object, self, dealloc);
}
 
static int hash(const Object *self) {
 
    const Value *this = (Value *) self;
 
    uintptr_t addr = (uintptr_t) this->value;
 
    return (int) ((13 * addr) ^ (addr >> 15));
}
 
static _Bool isEqual(const Object *self, const Object *other) {
 
    if (super(Object, self, isEqual, other)) {
        return true;
    }
 
    if (other && $(other, isKindOfClass, _Value())) {
 
        const Value *this = (Value *) self;
        const Value *that = (Value *) other;
 
        return this->value == that->value;
    }
 
    return false;
}
 
#pragma mark - Value
 
static Value *initWithBytes(Value *self, const uint8_t *bytes, size_t length) {
 
    self = (Value *) super(Object, self, init);
    if (self) {
        if (bytes) {
            self->value = calloc(1, length);
            assert(self->value);
 
            memcpy(self->value, bytes, length);
            self->destructor = free;
        }
    }
 
    return self;
}
 
static Value *initWithValue(Value *self, ident value) {
 
    self = (Value *) super(Object, self, init);
    if (self) {
        self->value = value;
    }
 
    return self;
}
 
#pragma mark - Class lifecycle
 
static void initialize(Class *clazz) {
 
    ((ObjectInterface *) clazz->interface)->dealloc = dealloc;
    ((ObjectInterface *) clazz->interface)->hash = hash;
    ((ObjectInterface *) clazz->interface)->isEqual = isEqual;
 
    ((ValueInterface *) clazz->interface)->initWithBytes = initWithBytes;
    ((ValueInterface *) clazz->interface)->initWithValue = initWithValue;
}
 
Class *_Value(void) {
    static Class *clazz;
    static Once once;
 
    do_once(&once, {
        clazz = _initialize(&(const ClassDef) {
            .name = "Value",
            .superclass = _Object(),
            .instanceSize = sizeof(Value),
            .interfaceOffset = offsetof(Value, interface),
            .interfaceSize = sizeof(ValueInterface),
            .initialize = initialize,
        });
    });
 
    return clazz;
}
 
#undef _Class