Data.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 <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#include "Data.h"
#include "Hash.h"
#include "MutableData.h"
 
#define _Class _Data
 
#define DATA_BLOCK_SIZE 4096
 
#pragma mark - Object
 
static Object *copy(const Object *self) {
 
    Data *this = (Data *) self;
 
    return (Object *) $(alloc(Data), initWithBytes, this->bytes, this->length);
}
 
static void dealloc(Object *self) {
 
    Data *this = (Data *) self;
 
    if (this->destroy) {
        if (this->bytes) {
            this->destroy(this->bytes);
        }
    }
 
    super(Object, self, dealloc);
}
 
static int hash(const Object *self) {
 
    Data *this = (Data *) self;
 
    int hash = HASH_SEED;
    hash = HashForInteger(hash, this->length);
 
    const Range range = { 0, this->length };
    hash = HashForBytes(hash, this->bytes, range);
 
    return hash;
}
 
static _Bool isEqual(const Object *self, const Object *other) {
 
    if (super(Object, self, isEqual, other)) {
        return true;
    }
 
    if (other && $(other, isKindOfClass, _Data())) {
 
        const Data *this = (Data *) self;
        const Data *that = (Data *) other;
 
        if (this->length == that->length) {
            return memcmp(this->bytes, that->bytes, this->length) == 0;
        }
    }
 
    return false;
}
 
#pragma mark - Data
 
static Data *dataWithBytes(const uint8_t *bytes, size_t length) {
 
    return $(alloc(Data), initWithBytes, bytes, length);
}
 
static Data *dataWithConstMemory(const ident mem, size_t length) {
 
    return $(alloc(Data), initWithConstMemory, mem, length);
}
 
static Data *dataWithContentsOfFile(const char *path) {
 
    return $(alloc(Data), initWithContentsOfFile, path);
}
 
static Data *dataWithMemory(ident mem, size_t length) {
 
    return $(alloc(Data), initWithMemory, mem, length);
}
 
static Data *initWithBytes(Data *self, const uint8_t *bytes, size_t length) {
 
    ident mem = malloc(length);
    assert(mem);
 
    memcpy(mem, bytes, length);
 
    return $(self, initWithMemory, mem, length);
}
 
static Data *initWithConstMemory(Data *self, const ident mem, size_t length) {
 
    self = (Data *) super(Object, self, init);
    if (self) {
        self->bytes = mem;
        self->length = length;
    }
 
    return self;
}
 
static Data *initWithContentsOfFile(Data *self, const char *path) {
 
    assert(path);
 
    FILE *file = fopen(path, "rb");
    if (file) {
        ident mem = NULL;
 
        int err = fseek(file, 0, SEEK_END);
        assert(err == 0);
 
        const size_t length = ftell(file);
        if (length) {
 
            mem = malloc(length);
            assert(mem);
 
            err = fseek(file, 0, SEEK_SET);
            assert(err == 0);
 
            const size_t read = fread(mem, length, 1, file);
            assert(read == 1);
        }
 
        fclose(file);
        return $(self, initWithMemory, mem, length);
    }
 
    return release(self);
}
 
static Data *initWithMemory(Data *self, ident mem, size_t length) {
 
    self = $(self, initWithConstMemory, mem, length);
    if (self) {
        self->destroy = free;
    }
 
    return self;
}
 
static MutableData *mutableCopy(const Data *self) {
 
    return $(alloc(MutableData), initWithData, self);
}
 
static _Bool writeToFile(const Data *self, const char *path) {
 
    assert(path);
 
    FILE *file = fopen(path, "w");
    if (file) {
 
        size_t count = 1;
 
        if (self->length) {
            count = fwrite(self->bytes, self->length, 1, file);
        }
 
        fclose(file);
 
        if (count == 1) {
            return true;
        }
    }
 
    return false;
}
 
#pragma mark - Class lifecycle
 
static void initialize(Class *clazz) {
 
    ((ObjectInterface *) clazz->interface)->copy = copy;
    ((ObjectInterface *) clazz->interface)->dealloc = dealloc;
    ((ObjectInterface *) clazz->interface)->hash = hash;
    ((ObjectInterface *) clazz->interface)->isEqual = isEqual;
 
    ((DataInterface *) clazz->interface)->dataWithBytes = dataWithBytes;
    ((DataInterface *) clazz->interface)->dataWithConstMemory = dataWithConstMemory;
    ((DataInterface *) clazz->interface)->dataWithContentsOfFile = dataWithContentsOfFile;
    ((DataInterface *) clazz->interface)->dataWithMemory = dataWithMemory;
    ((DataInterface *) clazz->interface)->initWithBytes = initWithBytes;
    ((DataInterface *) clazz->interface)->initWithConstMemory = initWithConstMemory;
    ((DataInterface *) clazz->interface)->initWithContentsOfFile = initWithContentsOfFile;
    ((DataInterface *) clazz->interface)->initWithMemory = initWithMemory;
    ((DataInterface *) clazz->interface)->mutableCopy = mutableCopy;
    ((DataInterface *) clazz->interface)->writeToFile = writeToFile;
}
 
Class *_Data(void) {
    static Class *clazz;
    static Once once;
 
    do_once(&once, {
        clazz = _initialize(&(const ClassDef) {
            .name = "Data",
            .superclass = _Object(),
            .instanceSize = sizeof(Data),
            .interfaceOffset = offsetof(Data, interface),
            .interfaceSize = sizeof(DataInterface),
            .initialize = initialize,
        });
    });
 
    return clazz;
}
 
#undef _Class