MutableData.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 "MutableData.h"
 
#define _Class _MutableData
 
#pragma mark - Object
 
static Object *copy(const Object *self) {
 
    Data *this = (Data *) self;
 
    MutableData *that = $(alloc(MutableData), init);
    $(that, appendBytes, this->bytes, this->length);
 
    return (Object *) that;
}
 
#pragma mark - MutableData
 
static void appendBytes(MutableData *self, const uint8_t *bytes, size_t length) {
 
    const size_t oldLength = self->data.length;
 
    $(self, setLength, self->data.length + length);
 
    memcpy(self->data.bytes + oldLength, bytes, length);
}
 
static void appendData(MutableData *self, const Data *data) {
 
    $(self, appendBytes, data->bytes, data->length);
}
 
static MutableData *data(void) {
 
    return $(alloc(MutableData), init);
}
 
static MutableData *dataWithCapacity(size_t capacity) {
 
    return $(alloc(MutableData), initWithCapacity, capacity);
}
 
static MutableData *init(MutableData *self) {
 
    return $(self, initWithCapacity, 0);
}
 
static MutableData *initWithCapacity(MutableData *self, size_t capacity) {
 
    self = (MutableData *) super(Object, self, init);
    if (self) {
 
        self->capacity = capacity;
        if (self->capacity) {
 
            self->data.bytes = calloc(capacity, sizeof(uint8_t));
            assert(self->data.bytes);
        }
 
        self->data.destroy = free;
    }
 
    return self;
}
 
static MutableData *initWithData(MutableData *self, const Data *data) {
 
    self = $(self, initWithCapacity, data->length);
    if (self) {
        $(self, appendData, data);
    }
 
    return self;
}
 
static void setLength(MutableData *self, size_t length) {
 
    const size_t newCapacity = (length / _pageSize + 1) * _pageSize;
    if (newCapacity > self->capacity) {
 
        if (self->data.bytes == NULL) {
            self->data.bytes = calloc(newCapacity, sizeof(uint8_t));
            assert(self->data.bytes);
        } else {
            self->data.bytes = realloc(self->data.bytes, newCapacity);
            assert(self->data.bytes);
 
            memset(self->data.bytes + self->data.length, 0, length - self->data.length);
        }
 
        self->capacity = newCapacity;
    }
 
    self->data.length = length;
}
 
#pragma mark - Class lifecycle
 
static void initialize(Class *clazz) {
 
    ((ObjectInterface *) clazz->interface)->copy = copy;
 
    ((MutableDataInterface *) clazz->interface)->appendBytes = appendBytes;
    ((MutableDataInterface *) clazz->interface)->appendData = appendData;
    ((MutableDataInterface *) clazz->interface)->data = data;
    ((MutableDataInterface *) clazz->interface)->dataWithCapacity = dataWithCapacity;
    ((MutableDataInterface *) clazz->interface)->init = init;
    ((MutableDataInterface *) clazz->interface)->initWithCapacity = initWithCapacity;
    ((MutableDataInterface *) clazz->interface)->initWithData = initWithData;
    ((MutableDataInterface *) clazz->interface)->setLength = setLength;
}
 
Class *_MutableData(void) {
    static Class *clazz;
    static Once once;
 
    do_once(&once, {
        clazz = _initialize(&(const ClassDef) {
            .name = "MutableData",
            .superclass = _Data(),
            .instanceSize = sizeof(MutableData),
            .interfaceOffset = offsetof(MutableData, interface),
            .interfaceSize = sizeof(MutableDataInterface),
            .initialize = initialize,
        });
    });
 
    return clazz;
}
 
#undef _Class