321 lines
8.3 KiB
C++
321 lines
8.3 KiB
C++
/***************************************************************************
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copyright : (C) 2002 - 2008 by Scott Wheeler
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email : wheeler@kde.org
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***************************************************************************/
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/***************************************************************************
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* This library is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU Lesser General Public License version *
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* 2.1 as published by the Free Software Foundation. *
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* *
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* This library is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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* Lesser General Public License for more details. *
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* *
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* You should have received a copy of the GNU Lesser General Public *
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* License along with this library; if not, write to the Free Software *
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA *
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* 02110-1301 USA *
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* *
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* Alternatively, this file is available under the Mozilla Public *
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* License Version 1.1. You may obtain a copy of the License at *
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* http://www.mozilla.org/MPL/ *
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***************************************************************************/
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#include <tbytevector.h>
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#include <tdebug.h>
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#include <tstring.h>
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#include "rifffile.h"
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#include <vector>
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using namespace TagLib;
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struct Chunk
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{
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ByteVector name;
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TagLib::uint offset;
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TagLib::uint size;
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char padding;
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};
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class RIFF::File::FilePrivate
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{
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public:
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FilePrivate() :
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endianness(BigEndian),
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size(0)
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{
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}
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Endianness endianness;
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ByteVector type;
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TagLib::uint size;
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ByteVector format;
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std::vector<Chunk> chunks;
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};
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////////////////////////////////////////////////////////////////////////////////
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// public members
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////////////////////////////////////////////////////////////////////////////////
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RIFF::File::~File()
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{
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delete d;
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}
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////////////////////////////////////////////////////////////////////////////////
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// protected members
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////////////////////////////////////////////////////////////////////////////////
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RIFF::File::File(FileName file, Endianness endianness) : TagLib::File(file)
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{
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d = new FilePrivate;
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d->endianness = endianness;
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if(isOpen())
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read();
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}
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RIFF::File::File(IOStream *stream, Endianness endianness) : TagLib::File(stream)
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{
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d = new FilePrivate;
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d->endianness = endianness;
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if(isOpen())
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read();
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}
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TagLib::uint RIFF::File::riffSize() const
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{
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return d->size;
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}
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TagLib::uint RIFF::File::chunkCount() const
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{
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return d->chunks.size();
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}
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TagLib::uint RIFF::File::chunkDataSize(uint i) const
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{
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return d->chunks[i].size;
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}
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TagLib::uint RIFF::File::chunkOffset(uint i) const
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{
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return d->chunks[i].offset;
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}
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TagLib::uint RIFF::File::chunkPadding(uint i) const
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{
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return d->chunks[i].padding;
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}
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ByteVector RIFF::File::chunkName(uint i) const
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{
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if(i >= chunkCount())
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return ByteVector::null;
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return d->chunks[i].name;
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}
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ByteVector RIFF::File::chunkData(uint i)
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{
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if(i >= chunkCount())
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return ByteVector::null;
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// Offset for the first subchunk's data
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long begin = 12 + 8;
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for(uint it = 0; it < i; it++)
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begin += 8 + d->chunks[it].size + d->chunks[it].padding;
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seek(begin);
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return readBlock(d->chunks[i].size);
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}
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void RIFF::File::setChunkData(uint i, const ByteVector &data)
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{
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// First we update the global size
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d->size += ((data.size() + 1) & ~1) - (d->chunks[i].size + d->chunks[i].padding);
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insert(ByteVector::fromUInt(d->size, d->endianness == BigEndian), 4, 4);
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// Now update the specific chunk
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writeChunk(chunkName(i), data, d->chunks[i].offset - 8, d->chunks[i].size + d->chunks[i].padding + 8);
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d->chunks[i].size = data.size();
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d->chunks[i].padding = (data.size() & 0x01) ? 1 : 0;
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// Now update the internal offsets
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for(i++; i < d->chunks.size(); i++)
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d->chunks[i].offset = d->chunks[i-1].offset + 8 + d->chunks[i-1].size + d->chunks[i-1].padding;
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}
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void RIFF::File::setChunkData(const ByteVector &name, const ByteVector &data)
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{
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setChunkData(name, data, false);
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}
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void RIFF::File::setChunkData(const ByteVector &name, const ByteVector &data, bool alwaysCreate)
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{
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if(d->chunks.size() == 0) {
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debug("RIFF::File::setChunkData - No valid chunks found.");
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return;
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}
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if(alwaysCreate && name != "LIST") {
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debug("RIFF::File::setChunkData - alwaysCreate should be used for only \"LIST\" chunks.");
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return;
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}
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if(!alwaysCreate) {
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for(uint i = 0; i < d->chunks.size(); i++) {
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if(d->chunks[i].name == name) {
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setChunkData(i, data);
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return;
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}
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}
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}
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// Couldn't find an existing chunk, so let's create a new one.
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uint i = d->chunks.size() - 1;
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ulong offset = d->chunks[i].offset + d->chunks[i].size;
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// First we update the global size
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d->size += (offset & 1) + data.size() + 8;
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insert(ByteVector::fromUInt(d->size, d->endianness == BigEndian), 4, 4);
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// Now add the chunk to the file
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writeChunk(name, data, offset, std::max<long>(0, length() - offset), (offset & 1) ? 1 : 0);
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// And update our internal structure
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if (offset & 1) {
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d->chunks[i].padding = 1;
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offset++;
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}
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Chunk chunk;
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chunk.name = name;
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chunk.size = data.size();
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chunk.offset = offset + 8;
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chunk.padding = (data.size() & 0x01) ? 1 : 0;
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d->chunks.push_back(chunk);
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}
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void RIFF::File::removeChunk(uint i)
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{
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if(i >= d->chunks.size())
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return;
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removeBlock(d->chunks[i].offset - 8, d->chunks[i].size + 8);
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d->chunks.erase(d->chunks.begin() + i);
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}
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void RIFF::File::removeChunk(const ByteVector &name)
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{
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std::vector<Chunk> newChunks;
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for(size_t i = 0; i < d->chunks.size(); ++i) {
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if(d->chunks[i].name == name)
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removeBlock(d->chunks[i].offset - 8, d->chunks[i].size + 8);
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else
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newChunks.push_back(d->chunks[i]);
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}
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d->chunks.swap(newChunks);
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}
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////////////////////////////////////////////////////////////////////////////////
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// private members
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////////////////////////////////////////////////////////////////////////////////
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static bool isValidChunkID(const ByteVector &name)
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{
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if(name.size() != 4) {
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return false;
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}
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for(int i = 0; i < 4; i++) {
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if(name[i] < 32 || name[i] > 127) {
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return false;
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}
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}
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return true;
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}
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void RIFF::File::read()
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{
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bool bigEndian = (d->endianness == BigEndian);
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d->type = readBlock(4);
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d->size = readBlock(4).toUInt(bigEndian);
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d->format = readBlock(4);
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// + 8: chunk header at least, fix for additional junk bytes
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while(tell() + 8 <= length()) {
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ByteVector chunkName = readBlock(4);
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uint chunkSize = readBlock(4).toUInt(bigEndian);
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if(!isValidChunkID(chunkName)) {
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debug("RIFF::File::read() -- Chunk '" + chunkName + "' has invalid ID");
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setValid(false);
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break;
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}
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if(tell() + chunkSize > uint(length())) {
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debug("RIFF::File::read() -- Chunk '" + chunkName + "' has invalid size (larger than the file size)");
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setValid(false);
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break;
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}
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Chunk chunk;
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chunk.name = chunkName;
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chunk.size = chunkSize;
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chunk.offset = tell();
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seek(chunk.size, Current);
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// check padding
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chunk.padding = 0;
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long uPosNotPadded = tell();
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if((uPosNotPadded & 0x01) != 0) {
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ByteVector iByte = readBlock(1);
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if((iByte.size() != 1) || (iByte[0] != 0)) {
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// not well formed, re-seek
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seek(uPosNotPadded, Beginning);
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}
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else {
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chunk.padding = 1;
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}
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}
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d->chunks.push_back(chunk);
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}
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}
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void RIFF::File::writeChunk(const ByteVector &name, const ByteVector &data,
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ulong offset, ulong replace, uint leadingPadding)
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{
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ByteVector combined;
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if(leadingPadding) {
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combined.append(ByteVector(leadingPadding, '\x00'));
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}
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combined.append(name);
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combined.append(ByteVector::fromUInt(data.size(), d->endianness == BigEndian));
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combined.append(data);
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if((data.size() & 0x01) != 0) {
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combined.append('\x00');
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}
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insert(combined, offset, replace);
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}
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