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/*************************************************************************
RIFFChunk.cpp - information about a RIFF chunk
-------------------
begin : Tue Mar 20 2002
copyright : (C) 2002 by Thomas Eschenbacher
email : Thomas.Eschenbacher@gmx.de
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "config.h"
#include <QList>
#include <QString>
#include "libkwave/String.h"
#include "libkwave/Utils.h"
#include "RIFFChunk.h"
//***************************************************************************
Kwave::RIFFChunk::RIFFChunk(RIFFChunk *parent, const QByteArray &name,
const QByteArray &format, quint32 length,
quint32 phys_offset, quint32 phys_length)
:m_type(Sub), m_name(name), m_format(format), m_parent(parent),
m_chunk_length(length), m_phys_offset(phys_offset),
m_phys_length(phys_length), m_sub_chunks()
{
}
//***************************************************************************
Kwave::RIFFChunk::~RIFFChunk()
{
while (!m_sub_chunks.isEmpty())
delete m_sub_chunks.takeLast();
}
//***************************************************************************
// #define CHECK(x) Q_ASSERT(!(x)); if (x) return false;
#define CHECK(x) if (x) return false;
bool Kwave::RIFFChunk::isSane() const
{
CHECK(m_type == Empty)
CHECK(m_type == Garbage)
CHECK((m_type == Main) && m_sub_chunks.isEmpty())
CHECK((m_type == Root) && m_sub_chunks.isEmpty())
#ifdef DEBUG
if (m_phys_length & 0x1) {
// size is not an even number: no criterium for insanity
// but worth a warning
qWarning("%s: physical length is not an even number: %u",
path().data(), m_phys_length);
}
#endif /* DEBUG */
unsigned int datalen = dataLength();
if (m_type == Main) datalen += 4;
if (((datalen + 1) < m_phys_length) || (datalen > m_phys_length)) {
qWarning("%s: dataLength=%u, phys_length=%u",
path().data(), datalen, m_phys_length);
return false;
}
foreach (const Kwave::RIFFChunk *chunk, subChunks())
if (chunk && !chunk->isSane()) return false;
return true;
}
//***************************************************************************
quint32 Kwave::RIFFChunk::physEnd() const
{
quint32 end = m_phys_offset + m_phys_length;
if (m_phys_length) --end;
if ((m_type != Root) && (m_type != Garbage)) end += 8;
return end;
}
//***************************************************************************
const QByteArray Kwave::RIFFChunk::path() const
{
QByteArray p = "";
if (m_parent) p += m_parent->path() + '/';
p += m_name;
if (m_type == Main) p += ':' + m_format;
if (m_parent) {
QListIterator<Kwave::RIFFChunk *> it(m_parent->subChunks());
unsigned int before = 0;
unsigned int after = 0;
const Kwave::RIFFChunk *chunk = nullptr;
while (it.hasNext()) {
chunk = it.next();
if (!chunk) continue;
if (chunk == this) break;
if (chunk->name() != m_name) continue;
if (chunk->type() != m_type) continue;
if ((m_type == Main) && (chunk->format() != m_format)) continue;
before++;
}
if ((chunk == this) && (it.hasNext())) chunk = it.next();
while ((chunk != this) && (it.hasNext())) {
chunk = it.next();
if (!chunk) continue;
if (chunk->name() != m_name) continue;
if (chunk->type() != m_type) continue;
if ((m_type == Main) && (chunk->format() != m_format)) continue;
after++;
}
if (before + after != 0) {
QByteArray index;
index.setNum(before);
p += '(' + index + ')';
}
}
return p;
}
//***************************************************************************
quint32 Kwave::RIFFChunk::dataStart() const
{
return m_phys_offset + ((m_type == Main) ? 12 : 8);
}
//***************************************************************************
quint32 Kwave::RIFFChunk::dataLength() const
{
return m_chunk_length - ((m_type == Main) ? 4 : 0);
}
//***************************************************************************
void Kwave::RIFFChunk::setLength(quint32 length)
{
m_chunk_length = length;
m_phys_length = length;
}
//***************************************************************************
bool Kwave::RIFFChunk::isChildOf(Kwave::RIFFChunk *chunk)
{
if (!chunk) return (m_type == Root); // only root has null as parent
if (chunk == m_parent) return true;
if (m_parent) return m_parent->isChildOf(chunk);
return false;
}
//***************************************************************************
void Kwave::RIFFChunk::fixSize()
{
// pass one: fix sizes of sub chunks recursively
foreach (Kwave::RIFFChunk *chunk, subChunks())
if (chunk) chunk->fixSize();
// pass two: sum up sub-chunks if type is main or root.
if ((m_type == Main) || (m_type == Root)) {
quint32 old_length = m_phys_length;
m_phys_length = 0;
if (m_type == Main) m_phys_length += 4;
foreach (const Kwave::RIFFChunk *chunk, subChunks()) {
if (!chunk) continue;
quint32 len = chunk->physEnd() - chunk->physStart() + 1;
m_phys_length += len;
}
if (m_phys_length != old_length) {
qDebug("%s: setting size from %u to %u",
path().data(), old_length, m_phys_length);
}
// chunk length is always equal to physical length for
// main and root !
m_chunk_length = m_phys_length;
} else {
// just round up if no main or root chunk
if (m_phys_length & 0x1) {
m_phys_length++;
qDebug("%s: rounding up size to %u", path().data(), m_phys_length);
}
// adjust chunk size to physical size if not long enough
if ((m_chunk_length+1 != m_phys_length) &&
(m_chunk_length != m_phys_length))
{
qDebug("%s: resizing chunk from %u to %u",
path().data(), m_chunk_length, m_phys_length);
m_chunk_length = m_phys_length;
}
}
}
//***************************************************************************
void Kwave::RIFFChunk::dumpStructure()
{
// translate the type into a user-readable string
const char *t = "?unknown?";
switch (m_type) {
case Root: t = "ROOT"; break;
case Main: t = "MAIN"; break;
case Sub: t = "SUB"; break;
case Garbage: t = "GARBAGE"; break;
case Empty: t = "EMPTY"; break;
DEFAULT_IGNORE;
}
// dump this chunk
qDebug("[0x%08X-0x%08X] (%10u/%10u) %7s, '%s'",
m_phys_offset, physEnd(), physLength(), length(),
t, path().data()
);
// recursively dump all sub-chunks
foreach (Kwave::RIFFChunk *chunk, m_sub_chunks)
if (chunk) chunk->dumpStructure();
}
//***************************************************************************
//***************************************************************************
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