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/***************************************************************************
copyright : (C) 2011 by Lukas Lalinsky
email : lalinsky@gmail.com
***************************************************************************/
/***************************************************************************
* This library is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License version *
* 2.1 as published by the Free Software Foundation. *
* *
* 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., 51 Franklin Street, Fifth Floor, Boston, MA *
* 02110-1301 USA *
* *
* Alternatively, this file is available under the Mozilla Public *
* License Version 1.1. You may obtain a copy of the License at *
* http://www.mozilla.org/MPL/ *
***************************************************************************/
#include "tbytevectorstream.h"
#include "tstring.h"
#include "tdebug.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
using namespace TagLib;
class ByteVectorStream::ByteVectorStreamPrivate
{
public:
ByteVectorStreamPrivate(const ByteVector &data);
ByteVector data;
long position;
};
ByteVectorStream::ByteVectorStreamPrivate::ByteVectorStreamPrivate(const ByteVector &data) :
data(data),
position(0)
{
}
////////////////////////////////////////////////////////////////////////////////
// public members
////////////////////////////////////////////////////////////////////////////////
ByteVectorStream::ByteVectorStream(const ByteVector &data)
{
d = new ByteVectorStreamPrivate(data);
}
ByteVectorStream::~ByteVectorStream()
{
delete d;
}
FileName ByteVectorStream::name() const
{
return FileName(""); // XXX do we need a name?
}
ByteVector ByteVectorStream::readBlock(ulong length)
{
if(length == 0)
return ByteVector::null;
ByteVector v = d->data.mid(d->position, length);
d->position += v.size();
return v;
}
void ByteVectorStream::writeBlock(const ByteVector &data)
{
uint size = data.size();
if(d->position + size > length()) {
truncate(d->position + size);
}
memcpy(d->data.data() + d->position, data.data(), size);
d->position += size;
}
void ByteVectorStream::insert(const ByteVector &data, ulong start, ulong replace)
{
long sizeDiff = data.size() - replace;
if(sizeDiff < 0) {
removeBlock(start + data.size(), -sizeDiff);
}
else if(sizeDiff > 0) {
truncate(length() + sizeDiff);
ulong readPosition = start + replace;
ulong writePosition = start + data.size();
memmove(d->data.data() + writePosition, d->data.data() + readPosition, length() - sizeDiff - readPosition);
}
seek(start);
writeBlock(data);
}
void ByteVectorStream::removeBlock(ulong start, ulong length)
{
ulong readPosition = start + length;
ulong writePosition = start;
if(readPosition < ulong(ByteVectorStream::length())) {
ulong bytesToMove = ByteVectorStream::length() - readPosition;
memmove(d->data.data() + writePosition, d->data.data() + readPosition, bytesToMove);
writePosition += bytesToMove;
}
d->position = writePosition;
truncate(writePosition);
}
bool ByteVectorStream::readOnly() const
{
return false;
}
bool ByteVectorStream::isOpen() const
{
return true;
}
void ByteVectorStream::seek(long offset, Position p)
{
switch(p) {
case Beginning:
d->position = offset;
break;
case Current:
d->position += offset;
break;
case End:
d->position = length() - offset;
break;
}
}
void ByteVectorStream::clear()
{
}
long ByteVectorStream::tell() const
{
return d->position;
}
long ByteVectorStream::length()
{
return d->data.size();
}
void ByteVectorStream::truncate(long length)
{
d->data.resize(length);
}
ByteVector *ByteVectorStream::data()
{
return &d->data;
}
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