ByteArray.cc

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/*
 * ByteArray.cc
 *
 * Smalltalk like class library for C++
 * Array of bytes.
 *
 * Copyright (c) 2003 Jan Vrany
 * Copyright (c) 2005 Milan Cermak
 */
/*
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include <stlib/ByteArray.h>
#include <stlib/EncodedStream.h>
#include <stlib/Integer.h>
#include <stlib/InternalEncodedStreamFactory.h>
#include <stlib/String.h>
#include <stlib/SOOBoundsError.h>

#include <string.h>

ByteArray::ByteArray(int size)
{
    bytes = NULL;
    tally = size;
    if (tally) {
        bytes = (unsigned char *) GC_malloc(tally * sizeof(unsigned char));
        bzero(bytes, tally);
    }
}

ByteArray::ByteArray(const ByteArray &origin)
{
    bytes = NULL;
    tally = origin.tally;
    if (tally) {
        bytes = (unsigned char *) GC_malloc(tally * sizeof(unsigned char));
        memcpy(bytes, origin.bytes, tally);
    }
}

ByteArray::ByteArray(const char *buffer, int size)
{
    bytes = NULL;
    tally = size;
    if (tally) {
        bytes = (unsigned char *) GC_malloc(tally * sizeof(unsigned char));
        memcpy(bytes, buffer, tally);
    }
}

ByteArray::~ByteArray()
{
    if (tally)
        GC_free(bytes);
}

/* Instance creation protocol */
ByteArray *ByteArray::fromStringEncoding(const String *string, String *encoding)
{
    EncodedStream *stream = (new ByteArray(string->size()))->withEncoding(encoding)->writeStream();
    stream->nextPutAll(string);
    return dynamic_cast<ByteArray *>(stream->contents());
}

/* Accessing protocol */
Object* ByteArray::at(int index) const
{
    if (index < 0 || index >= tally) {
        SubscriptOutOfBoundsError *ex;
        ex = new SubscriptOutOfBoundsError(__PRETTY_FUNCTION__, index);
        ex->raiseFrom(this);
    }
    return Integer::value(bytes[index] & 0xFF);
}

void ByteArray::put(int index, Object* obj)
{
    if (index < 0 || index >= tally) {
        SubscriptOutOfBoundsError *ex;
        ex = new SubscriptOutOfBoundsError(__PRETTY_FUNCTION__, index);
        ex->raiseFrom(this);
    }
    checkObject(obj, __PRETTY_FUNCTION__);
    unsigned char val = ((Number *) obj)->asLong();
    bytes[index] = val & 0xFF;
}

void ByteArray::replace(long start, long stop, unsigned char *collection)
{
    replace(start, stop, collection, 0);
}

void ByteArray::replace(long start, long stop,
                        unsigned char *collection, long startIndex)
{
    memcpy(&bytes[start], &collection[startIndex], stop - start);
}

void ByteArray::changeSize(long newSize)
{
    unsigned char *oldBytes = bytes;
    long i;

    bytes = (unsigned char *) GC_malloc(newSize * sizeof(unsigned char));
    // MC: This will fail when shinking the content
//    memset(bytes, 0, newSize);
//    memcpy(bytes, oldBytes, (newSize > tally) ? newSize : tally);
    /* Copy old content or the part that fits */
    for (i = 0; i < newSize && i < tally; i++) {
        bytes[i] = oldBytes[i];
    }
    /* Fill the rest with 0s */
    for (; i < newSize; i++) {
        bytes[i] = 0;
    }
    tally = newSize;
    GC_free(oldBytes);
}

void ByteArray::add(Object *obj)
{
    shouldNotImplement(__PRETTY_FUNCTION__);
}

Object* ByteArray::copy(void)
{
    return new ByteArray(*this);
}

Object* ByteArray::copyEmpty(long int size)
{
    return new ByteArray(size);
}

/* Comparing protocol */
long ByteArray::hash(void) const
{
    long hashConst = 0x23451;
    int length = size();

    if (length > 0) {
        hashConst ^= bytes[0];
        if (length > 1) {
            hashConst ^= bytes[length-1];
            if (length > 3) {
                hashConst ^= bytes[length/2-1] ^ bytes[length/2+1];
            }
        }
    }
    return hashConst;
}

bool ByteArray::isEqual(const Object *object) const
{
    return object->isEqualToByteArray(this);
}

bool ByteArray::isEqual(const char *array, int size) const
{
    if (size != tally) return false;
    return memcmp(bytes, array, tally) == 0;
}

bool ByteArray::isEqualToByteArray(const Object *array) const
{
    return dynamic_cast<const ByteArray *>(array)->isEqual((char *) bytes, tally);
}

/* Converting protocol */
ByteArray *ByteArray::asByteArray(void)
{
    return this;
}

char *ByteArray::asCString(void)
{
    char *cString = (char *) GC_malloc((tally + 1) * sizeof(char));
    memcpy(cString, bytes, tally);
    cString[tally] = 0;
    return cString;
}

String *ByteArray::asString(void)
{
    return new String(this);
}

String *ByteArray::asStringWithEncoding(String *encoding)
{
    return dynamic_cast<String *>(withEncoding(encoding)->readStream()->upToEnd());
}

String *ByteArray::asStringWithEncoding(const char *encoding)
{
    return asStringWithEncoding(new String(encoding));
}

unsigned long ByteArray::asInteger(void)
{
    return asNumberWithRadix(256);
}

unsigned long ByteArray::asNumberWithRadix(int radix)
{
    unsigned long number = 0;

    for (long i = 0; i < tally; i++) {
        number = number * radix + bytes[i];
    }
    return number;
}

unsigned char *ByteArray::rawBytes(void) const
{
//#ifdef NOGC
//    unsigned char *retbytes = (unsigned char *) malloc(tally);
//#else
    unsigned char *retbytes = (unsigned char *) GC_malloc(tally * sizeof(unsigned char *));
//#endif
    memcpy(retbytes, bytes, tally);
    return retbytes;
}

const unsigned char *ByteArray::rawBytesReadOnly(void) const
{
    return bytes;
}

/* Stream construction protocol */
InternalEncodedStreamFactory *ByteArray::withEncoding(String *encoding)
{
    return new InternalEncodedStreamFactory(this, encoding);
}

InternalEncodedStreamFactory *ByteArray::withEncoding(const char *encoding)
{
    return withEncoding(new String(encoding));
}

/* Testing protocol */
bool ByteArray::isByteArray(void)
{
    return true;
}

/* Private protocol */
void ByteArray::checkObject(Object *obj, const char *sel)
{
    if (obj->isNumber()) {
        Number* n = (Number *) obj;
        long long l = n->asLongLong();
        if (l < 0 || l > 255) {
            Error *e = new Error(new String("Invalid value!"), new String(sel), obj);
            e->raiseFrom(this);
        }
    } else {
        Error *e = new Error(new String("Not a Number instance!"), new String(sel), obj);
        e->raiseFrom(this);
    }
}

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