uic9183block.cpp

/*
    SPDX-FileCopyrightText: 2019 Volker Krause <vkrause@kde.org>
 
    SPDX-License-Identifier: LGPL-2.0-or-later
*/
 
#include "uic9183block.h"
#include "uic9183utils.h"
#include "logging.h"
 
#include <cstring>
 
using namespace KItinerary;
 
enum {
    BlockHeaderSize = 12,
    BlockVersionOffset = 6,
    BlockVersionSize = 2,
    BlockSizeOffset = 8,
    BlockSizeSize = 4,
};
 
Uic9183Block::Uic9183Block() = default;
Uic9183Block::Uic9183Block(const Uic9183Block&) = default;
Uic9183Block::Uic9183Block(Uic9183Block&&) = default;
Uic9183Block& Uic9183Block::operator=(const Uic9183Block&) = default;
Uic9183Block& Uic9183Block::operator=(Uic9183Block&&) = default;
 
Uic9183Block::Uic9183Block(const QByteArray &data, int offset)
    : m_offset(offset)
{
    if (data.size() < offset + BlockHeaderSize) {
        return;
    }
 
    const auto blockSize = Uic9183Utils::readAsciiEncodedNumber(data, offset + BlockSizeOffset, BlockSizeSize);
    if (data.size() < (blockSize + offset) || blockSize < BlockHeaderSize) {
        return;
    }
 
    m_data = data;
}
 
bool Uic9183Block::operator==(const Uic9183Block &other) const
{
    return size() == other.size() && std::memcmp(m_data.constData() + m_offset, other.m_data.constData() + other.m_offset, size()) == 0;
}
 
 
// 6x header name
// 2x block version
// 4x block size as string, including the header
// followed by block payload (as 12 byte offset from header start)
 
const char* Uic9183Block::name() const
{
    if (isNull()) {
        return nullptr;
    }
    return m_data.constData() + m_offset;
}
 
bool Uic9183Block::isA(const char recordId[6]) const
{
    return std::strncmp(name(), recordId, 6) == 0;
}
 
const char* Uic9183Block::content() const
{
    if (isNull()) {
        return nullptr;
    }
    return m_data.constData() + m_offset + BlockHeaderSize;
}
 
int Uic9183Block::size() const
{
    return Uic9183Utils::readAsciiEncodedNumber(m_data, m_offset + BlockSizeOffset, BlockSizeSize);
}
 
int Uic9183Block::contentSize() const
{
    return std::max(0, size() - BlockHeaderSize);
}
 
int Uic9183Block::version() const
{
    return Uic9183Utils::readAsciiEncodedNumber(m_data, m_offset + BlockVersionOffset, BlockVersionSize);
}
 
bool Uic9183Block::isNull() const
{
    return m_data.isEmpty();
}
 
Uic9183Block Uic9183Block::nextBlock() const
{
    return Uic9183Block(m_data, m_offset + size());
}
 
QString Uic9183Block::contentText() const
{
    return Uic9183Utils::readUtf8String(m_data, m_offset + BlockHeaderSize, contentSize());
}
 
#include "moc_uic9183block.cpp"