void IOHandlerTest::testInput()
{
QTemporaryFile stdIn;
stdIn.open();
IOHandler io(stdIn.handle());
QVector<quint64> ids;
quint32 size = 10;
ids.reserve(size);
QByteArray ba;
ba.append(reinterpret_cast<char*>(&size), sizeof(quint32));
for (quint64 i = 0; i < 10; ++i) {
quint64 a = std::pow(16, i);
ids.append(a);
ba.append(reinterpret_cast<char*>(&a), sizeof(quint64));
}
stdIn.write(ba.data(), ba.size());
//we will de dealing with stdin actually which is a sequential device
//hence io handler expects to read from start.
stdIn.reset();
io.newBatch();
quint32 i = 0;
while (!io.atEnd()) {
QCOMPARE(io.nextId(), ids.at(i++));
}
QCOMPARE(i, size);
}
void tst_QTemporaryFile::write()
{
QByteArray data("OLE\nOLE\nOLE");
QTemporaryFile file;
QVERIFY(file.open());
QCOMPARE((int)file.write(data), data.size());
file.reset();
QFile compare(file.fileName());
compare.open(QIODevice::ReadOnly);
QCOMPARE(compare.readAll() , data);
file.close();
}
int main(int, char *[])
{
Data data;
data.setString("Hello World");
data.setValue(42);
QTemporaryFile file;
if (!file.open()) {
qDebug() << "Temp file opening failed.";
return EXIT_FAILURE;
}
QDataStream stream(&file);
// If a custom type is searilzed using QVariant,
// serialization operators need to be provided
#ifdef USE_VARIANT
qRegisterMetaTypeStreamOperators<Data>("Data");
QVariant variantData(QVariant::fromValue(data));
stream << variantData;
#else
stream << data;
#endif
file.reset();
// Serialize from the file
Data dataFromFile;
#ifdef USE_VARIANT
QVariant variantFromFile;
stream >> variantFromFile;
dataFromFile.setString(variantFromFile.value<Data>().string());
dataFromFile.setValue(variantFromFile.value<Data>().value());
#else
stream >> dataFromFile;
#endif
qDebug() << dataFromFile.string();
qDebug() << dataFromFile.value();
file.close();
return EXIT_SUCCESS;
}
bool KNMusicTagApev2::writeTag(const KNMusicAnalysisItem &analysisItem)
{
//Write the data according to the detail info.
const KNMusicDetailInfo &detailInfo=analysisItem.detailInfo;
//Check the file is still exist or not.
QFile musicFile(detailInfo.filePath);
//If the file is not exist then return false.
if(!musicFile.exists())
{
return false;
}
//Find the original tag data.
//ID3v1 header flag.
bool hasId3v1=false;
//Generate a header structure.
APEHeader header;
//Generate the raw tag data list.
QList<APETagItem> itemList;
//Initial the tag start position.
qint64 tagDataStart=-1, tagDataLength=-1;
//Open the file first.
if(musicFile.open(QIODevice::ReadOnly))
{
//Generate a data stream.
QDataStream musicDataStream(&musicFile);
if(musicFile.size() > 128)
{
//ID3v1 header cache.
char id3v1Header[3];
//Check whether there's ID3v1 tag in the music file.
musicDataStream.skipRawData(musicFile.size()-128);
//Read ID3v1 header.
musicDataStream.readRawData(id3v1Header, 3);
//Check the header, and we can know that whether there's ID3v1
//header.
hasId3v1=(id3v1Header[0]=='T' &&
id3v1Header[1]=='A' &&
id3v1Header[2]=='G');
}
//Check the beginning of the file.
if(checkHeader(0,
musicDataStream,
header))
{
//Set the tag data start.
tagDataStart=0;
//Set the tag length to header length.
tagDataLength=header.size;
//Check whether is a footer in the tag.
if(header.size > APEv2HeaderSize)
{
//Check the footer.
APEHeader footer;
//Tried to parse the footer.
if(checkHeader(header.size,
musicDataStream,
footer))
{
//Update the tag length.
tagDataLength+=APEv2HeaderSize;
}
}
//Reset the device to start.
musicDataStream.device()->reset();
//Skip the file data.
musicDataStream.skipRawData(APEv2HeaderSize);
}
//Check the end of the file.
else if(checkHeader(musicFile.size()-APEv2HeaderSize,
musicDataStream,
header))
{
//Save the tag start data.
int tagContentStart=musicFile.size()-header.size;
//Check the footer.
APEHeader footer;
//Check whether there's a header in the tag.
if(checkHeader(tagContentStart-APEv2HeaderSize,
musicDataStream,
footer))
{
//Save the tag data start position as the header start position.
//This is APEv2 tag.
tagDataStart=tagContentStart-APEv2HeaderSize;
//The tag length will be a header size + tag size.
tagDataLength=APEv2HeaderSize + header.size;
}
else
{
//This is APEv1 tag.
tagDataStart=tagContentStart;
//The tag length will be tag size.
tagDataLength=header.size;
}
//Reset the device to start.
musicDataStream.device()->reset();
//Skip the file data.
musicDataStream.skipRawData(tagContentStart);
}
//Check the position before ID3v1. Some file may have both ID3v1 and
//APEv1/APEv2.
else if(musicFile.size()>=(ID3v1nAPEv2 + APEv2HeaderSize) &&
//File size first.
checkHeader(musicFile.size()-ID3v1nAPEv2,
musicDataStream,
header))
{
//Save the tag start position.
int tagContentStart=musicFile.size()-ID3v1Size-header.size;
//Check the footer.
APEHeader footer;
//Check whether there's a header in the tag.
if(checkHeader(tagContentStart-APEv2HeaderSize,
musicDataStream,
footer))
{
//Save the tag data start position as the header start position.
//This is APEv2 tag.
tagDataStart=tagContentStart-APEv2HeaderSize;
//The tag length will be a header size + tag size.
tagDataLength=APEv2HeaderSize + header.size;
}
else
{
//This is APEv1 tag.
tagDataStart=tagContentStart;
//The tag length will be tag size.
tagDataLength=header.size;
}
//Reset the device to start.
musicDataStream.device()->reset();
//Skip the file data.
musicDataStream.skipRawData(tagContentStart);
}
//Parse the data if we find the header.
if(tagDataStart!=-1)
{
//Read the tag from the file.
char *rawTagData=new char[header.size];
musicDataStream.readRawData(rawTagData, header.size);
//Parse the raw tag data list.
parseRawData(rawTagData, header, itemList);
//Recover the memory.
delete[] rawTagData;
}
//Close the music file.
musicFile.close();
}
//Add all the text labels to detail frames if it's not empty.
for(int i=0; i<MusicDataCount; i++)
{
//Check if the text is empty.
if(detailInfo.textLists[i].toString().isEmpty())
{
continue;
}
//Get the frame key from hash group.
QString key=m_indexKey.value(i, QString());
//If the key is empty, means you cannot write this data to APEv2.
if(key.isEmpty())
{
continue;
}
//Generate a data frame.
APETagItem item;
//Save the key.
item.key=key;
//According to the frame, generate the item.
switch(i)
{
case DiscNumber:
//If disc count isn't empty, then add disc count to disc number
//data.
item.value=detailInfo.textLists[DiscCount].toString().isEmpty()?
detailInfo.textLists[DiscNumber].toString().toUtf8():
(detailInfo.textLists[DiscNumber].toString()+"/"+
detailInfo.textLists[DiscCount].toString()).toUtf8();
default:
//Add the whole data to the item.
item.value=detailInfo.textLists[i].toString().toUtf8();
}
//Remove the all the original item.
//We have to check the key from the back to the first, and we won't get
//mess to the index.
for(int i=itemList.size()-1; i>-1; i--)
{
//If the key is the same as current key,
if(itemList.at(i).key==key)
{
//Remove it.
itemList.removeAt(i);
}
}
//Add current key to item list.
itemList.append(item);
}
//Now translate the frame structure data to the raw data.
QByteArray contentData;
//Prepare the cache size.
char numberCache[4];
//Simply transfered the APETagItem to content data.
for(auto i=itemList.constBegin(); i!=itemList.constEnd(); ++i)
{
//Get the item size.
quint32 size=(*i).value.size();
//First transfer item size to raw data into cache.
numberToData(size, numberCache);
//Add item size to content data.
contentData.append(numberCache, 4);
//Transfer the flag to raw data into cache.
numberToData((*i).flag, numberCache);
//Add flag data to content data.
contentData.append(numberCache, 4);
//Add item key to content data.
contentData.append((*i).key.toUtf8());
//Add 0x00 for item key terminator.
contentData.append('\0');
//Add item value.
contentData.append((*i).value);
}
//Update the header data.
header.size=contentData.size()+32;
header.itemCount=itemList.size();
//We will write the APEv2 data to the end part of the file. Just before the
//ID3v1.
//Check the header data.
//Open the music file again.
if(!musicFile.open(QIODevice::ReadOnly))
{
return false;
}
//Generate a temporary file, write the new data to the temporary file.
QTemporaryFile updatedTagFile;
//Open the temporary file, if we cannot open the temporary file it will be
//failed to write the tag.
if(!updatedTagFile.open())
{
//Close the opened music file.
musicFile.close();
return false;
}
//Initial the file size.
qint64 dataSurplusSize=musicFile.size();
/*
* Algorithm:
* We treat the file as these two kinds of format:
* APEv2 | xxxx (Content) (| ID3v1)
* or
* xxxx (Content) | APEv2 (| ID3v1)
* So we have to process the ID3v1 at first. Then the file should be like
* the following:
* APEv2 | xxxx (Content)
* or
* xxxx (Content) | APEv2
* And now, we only have to check if the APEv2 is at the beginning or the
* end of the content.
*/
//If we have ID3v1, then remove the tag from the copying bytes.
if(hasId3v1)
{
//Reduce the ID3v1 tag size.
dataSurplusSize-=128;
}
//Check whether we have original APEv2 header.
if(tagDataStart!=-1)
{
//Reduce the tag size from the file size.
dataSurplusSize-=tagDataLength;
//Check whether the header is at the start of the music file.
if(tagDataStart==0)
{
//It's at the beginning of the file.
//Skip the Original APEv2 tag at the beginning of the file.
musicFile.seek(tagDataLength);
}
}
//Generate the music data cache.
char *turboCache=new char[DataCacheSize];
int bytesRead;
//Now copy all the content from the original file to temporary file.
while(dataSurplusSize>0)
{
//Read the original data.
bytesRead=musicFile.read(turboCache,
(DataCacheSize < dataSurplusSize ?
DataCacheSize : dataSurplusSize));
//Write the cache to temporary file.
updatedTagFile.write(turboCache, bytesRead);
//Reduce the surplus size.
dataSurplusSize-=bytesRead;
}
//According to the hydrogenaud.io, we have to put the APEv2 at the end of
//the file.
//Write new APEv2 tag to the file.
/*
* From http://wiki.hydrogenaud.io/index.php?title=Ape_Tags_Flags:
* Bit 29:
* 0: This is the footer, not the header
* 1: This is the header, not the footer
*/
//First set the item flag to header in header data bytearray.
updatedTagFile.write(generateHeaderData(header, true));
//Then, write the content data.
updatedTagFile.write(contentData);
//Last, write the footer data.
updatedTagFile.write(generateHeaderData(header, false));
//If there's ID3v1 tag, then copy the ID3v1 data from the original file.
if(hasId3v1)
{
//Seek to the ID3v1 tag start.
musicFile.seek(musicFile.size()-128);
//Read 128 bytes ID3v1 tag.
musicFile.read(turboCache, 128);
//Write the cache to temporary file.
updatedTagFile.write(turboCache, 128);
}
//Close the music file.
musicFile.close();
//Reset the temporary file.
updatedTagFile.reset();
//Reopen the music file as write only mode, write all the udpated tag file
//data to the music file.
if(!musicFile.open(QIODevice::WriteOnly))
{
return false;
}
//Copy data from temporary file to music file.
bytesRead=updatedTagFile.read(turboCache, DataCacheSize);
while(bytesRead>0)
{
//Write the cache to music file.
musicFile.write(turboCache, bytesRead);
//Read new data from the original file to cache.
bytesRead=updatedTagFile.read(turboCache, DataCacheSize);
}
//Close the music file and temporary file.
musicFile.close();
updatedTagFile.close();
//Clear up the turbo cache.
delete[] turboCache;
//The tag rewrite is finished.
return true;
}
bool KNMusicCueListParser::writeDetail(const KNMusicAnalysisItem &analysisItem)
{
//Get the track index.
const KNMusicDetailInfo &detailInfo=analysisItem.detailInfo;
//Prepare the orignial file data and the temporary file data.
QTemporaryFile updatedListFile;
QFile listFile(detailInfo.trackFilePath);
//Open the list file.
if(!listFile.open(QIODevice::ReadOnly))
{
return false;
}
//Open the list file.
if(!updatedListFile.open())
{
//Close the opened music file.
listFile.close();
return false;
}
//Read the list file.
//Initial the list file and temporary file stream as a text file.
QTextStream trackStream(&listFile), temporaryStream(&updatedListFile);
//Read until the track index comes to the track index.
QString rawLine=trackStream.readLine();
//Check the raw line.
while(!rawLine.isNull())
{
//Simplified the raw line.
QString commandRawLine=rawLine.simplified();
//Generate command part and data part cache.
QString rawCommand, rawData;
//Parse the command.
parseCommand(commandRawLine, rawCommand, rawData);
//Now we are only taken care about the TRACK.
if(rawCommand=="TRACK")
{
//Use the trackIndex variable find the space temporarily.
int trackIndex=rawData.indexOf(' ');
//Get the track index.
trackIndex=
(trackIndex==-1?rawData:rawData.left(trackIndex)).toInt();
//Check the track index.
if(trackIndex==detailInfo.trackIndex)
{
//Hit the track.
//First we have to output the raw line data.
temporaryStream << rawLine << '\n';
//Then check the detail info data.
//We have to write out these informations:
// PERFORMER Artist
// TITLE Name
QString trackData;
trackData.append(generateLine(
" TITLE ",
detailInfo.textLists[Name].toString()));
trackData.append(generateLine(
" PERFORMER ",
detailInfo.textLists[Artist].toString()));
//Write the track data to temporary file.
temporaryStream << trackData;
//Read the original file again until to INDEX, skip all the
//other data.
rawLine=trackStream.readLine();
//Simplified the raw line.
commandRawLine=rawLine.simplified();
//Parse the raw line.
parseCommand(commandRawLine, rawCommand, rawData);
//Read until we get the INDEX.
while(!rawLine.isNull() && rawCommand!="INDEX")
{
//Continue skip the file.
rawLine=trackStream.readLine();
//Simplified the raw line.
commandRawLine=rawLine.simplified();
//Parse the raw line.
parseCommand(commandRawLine, rawCommand, rawData);
}
//So now the data should be the first INDEX.
//Output the data and continue copy the data.
temporaryStream << rawLine << '\n';
}
else
{
//Simply output the data.
temporaryStream << rawLine << '\n';
}
}
else
{
//Simply output the data.
temporaryStream << rawLine << '\n';
}
//Read the next line.
rawLine=trackStream.readLine();
}
//Flush the data.
temporaryStream << flush;
//Now the data should be all done.
//Close the list file.
listFile.close();
//Reset the temporary file.
updatedListFile.reset();
//Reopen the list file, open as write only mode.
if(!listFile.open(QIODevice::WriteOnly))
{
return false;
}
//Write all the data to list file.
//Generate the music data cache.
char *turboCache=new char[DataCacheSize];
//Now copy all the content from the original file to temporary file.
int bytesRead=updatedListFile.read(turboCache, DataCacheSize);
while(bytesRead>0)
{
//Write the cache to the list file.
listFile.write(turboCache, bytesRead);
//Read new data from the original file to cache.
bytesRead=updatedListFile.read(turboCache, DataCacheSize);
}
//Close the list file and temporary file.
listFile.close();
updatedListFile.close();
//Clear up the turbo cache.
delete[] turboCache;
//Written finished.
return true;
}
bool KNMusicTagM4a::writeTag(const KNMusicAnalysisItem &analysisItem)
{
//Get the detail info.
const KNMusicDetailInfo &detailInfo=analysisItem.detailInfo;
//Prepare and get the music file.
QFile musicFile(detailInfo.filePath);
//Open the file as read only mode.
if(!musicFile.open(QIODevice::ReadOnly))
{
//Failed to open the source.
return false;
}
//Generate a temporary file, write the new data to the temporary file.
QTemporaryFile updatedTagFile;
//Open the temporary file, if we cannot open the temporary file it will be
//failed to write the tag.
if(!updatedTagFile.open())
{
//Close the opened music file.
musicFile.close();
return false;
}
//Generate a data stream for music file.
QDataStream musicDataStream(&musicFile);
//Read and copy the fytp box. If the first box isn't fytp box, then ignore
//the file.
M4ABox ftypBox;
if(!getBox(musicDataStream, ftypBox) || ftypBox.name!="ftyp")
{
//Close both file.
musicFile.close();
updatedTagFile.close();
//Failed to find a m4a file, return false.
return false;
}
//Write ftyp data to the temporary file.
writeBox(ftypBox, updatedTagFile);
//We have to keep reading until we find out the moov box.
//Output all the other data to updated tag file.
M4ABox moovBox;
for(;;)
{
//If we can get a new box.
if(getBox(musicDataStream, moovBox))
{
//Check out the name.
if(moovBox.name=="moov")
{
break;
}
else
{
//Copy the data.
writeBox(moovBox, updatedTagFile);
}
}
else
{
//If we cannot find a box, means there's no "moov" box, failed to
//write data.
//Close both file.
musicFile.close();
updatedTagFile.close();
//Failed to find a m4a file, return false.
return false;
}
}
//When we comes to here, we should find the "moov" box, expand the box to
//find out the "udta" box.
QList<M4ABox> moovExpandList;
extractBox(moovBox, moovExpandList);
//Generate a empty box for "udta" box.
M4ABox udtaBox;
//Check the expand list.
if(moovExpandList.isEmpty() ||
!findBox("udta", udtaBox, moovExpandList))
{
//If the name of the udta box is still empty, means there's no udta box
//in the moov box, then we are faild to parse.
//Close both file.
musicFile.close();
updatedTagFile.close();
//Failed to find a m4a file, return false.
return false;
}
//Expand the "udta" box, and find "meta" box.
QList<M4ABox> udtaExpandList;
extractBox(udtaBox, udtaExpandList);
//Generate a empty box for "meta" box.
M4ABox metaBox;
//Check the expand list and find box.
if(udtaExpandList.isEmpty() ||
!findBox("meta", metaBox, udtaExpandList))
{
//If the name of the meta box is still empty, means we cannot find meta
//box in the meta box, then we are finished to parse.
//Close both file.
musicFile.close();
updatedTagFile.close();
//Failed to find a m4a file, return false.
return false;
}
//Okay, now we can parse the meta box.
//Generate a box for ilst.
M4ABox ilstBox;
QList<M4ABox> metaExpandList;
//Extract the meta box.
extractMetaBox(metaBox, metaExpandList);
//Find all box of the expand list.
if(metaExpandList.isEmpty() ||
!findBox("ilst", ilstBox, metaExpandList))
{
//We cannot find ilst box in the meta box.
//Close both file.
musicFile.close();
updatedTagFile.close();
//Failed to find a m4a file, return false.
return false;
}
//Prepare the ilst expand list.
QList<M4ABox> ilstExpandList;
//Expand the ilst box.
extractBox(ilstBox, ilstExpandList);
//Now we have to write data to ilst expand list.
for(int i=0; i<MusicDataCount; ++i)
{
//Get the atom name of current data.
QString atomName=m_indexAtomMap.value(i, QString());
//Check if the atom name is empty, then go to the next.
if(atomName.isEmpty())
{
continue;
}
//Remove the exist data inside the ilst expand list.
for(int j=ilstExpandList.size()-1; j>-1; --j)
{
//Check the name of the item.
if(ilstExpandList.at(j).name==atomName)
{
//Remove it.
ilstExpandList.removeAt(j);
}
}
//Generate the raw data.
QByteArray rawData;
//Write the data to raw data.
switch(i)
{
case TrackNumber:
//Append three 0x00 first.
rawData.append((char)0x00);
rawData.append((char)0x00);
rawData.append((char)0x00);
//Append the track index.
rawData.append((char)detailInfo.textLists[TrackNumber].toString()
.toInt());
//Append splitter 0x00.
rawData.append((char)0x00);
//Append the track count.
rawData.append((char)detailInfo.textLists[TrackCount].toString()
.toInt());
//Append two 0x00 after.
rawData.append((char)0x00);
rawData.append((char)0x00);
break;
case DiscNumber:
//Append three 0x00 first.
rawData.append((char)0x00);
rawData.append((char)0x00);
rawData.append((char)0x00);
//Append the disc index.
rawData.append((char)detailInfo.textLists[DiscNumber].toString()
.toInt());
//Append splitter 0x00.
rawData.append((char)0x00);
//Append the disc count.
rawData.append((char)detailInfo.textLists[DiscCount].toString()
.toInt());
//Append two 0x00 after.
rawData.append((char)0x00);
rawData.append((char)0x00);
break;
case Rating:
//Append the rating to bytes.
rawData.append((char)detailInfo.textLists[Rating].toString()
.toInt());
break;
default:
//Translate the text data to UTF-8, without BOM.
rawData=detailInfo.textLists[i].toString().toUtf8();
}
//Generate the box.
ilstExpandList.append(generateItemBox(i, atomName, rawData));
}
//Remove all the album art atom.
for(int j=ilstExpandList.size()-1; j>-1; --j)
{
//Check the name of the item.
if(ilstExpandList.at(j).name=="covr")
{
//Remove it.
ilstExpandList.removeAt(j);
}
}
//Check album art.
if(!analysisItem.coverImage.isNull())
{
//Generate the raw data for the image.
//Add the png raw data to image data.
QByteArray imageData;
QBuffer imageBuffer(&imageData);
//Open the image buffer.
imageBuffer.open(QIODevice::WriteOnly);
//Save the data to image data.
analysisItem.coverImage.save(&imageBuffer, "PNG");
//Close the image buffer.
imageBuffer.close();
//Check the image data, if the data is not empty, then insert data.
if(imageData.isEmpty())
{
//Generate the flag data.
char covrFlag[5];
covrFlag[0]=0x00;
covrFlag[1]=0x00;
covrFlag[2]=0x00;
covrFlag[3]=14;
//Generate item box, insert to list.
ilstExpandList.append(generateItemBox(covrFlag, "covr", imageData));
}
}
//Combine the ilst data together.
M4ABox updatedIlstBox=zipBox("ilst", ilstExpandList);
//Clear the list and original ilst box.
ilstExpandList.clear();
clearBox(ilstBox);
//Replace the original ilst box.
for(int i=metaExpandList.size()-1; i>-1; --i)
{
//Check the name.
if(metaExpandList.at(i).name=="ilst")
{
//Replace the item.
metaExpandList.replace(i, updatedIlstBox);
//Stop searching.
break;
}
}
//Combine the meta expand list data.
QByteArray metaRawData=combineBoxList(metaExpandList);
//Clear up the meta expand list.
metaExpandList.clear();
//Append the first four bytes raw data to the meta box raw data.
metaRawData.prepend(metaBox.data, 4);
//Clear up the no use meta box.
clearBox(metaBox);
clearBox(updatedIlstBox);
//Set the data to new meta box.
metaBox.name="meta";
metaBox.independence=true;
metaBox.size=metaRawData.size();
metaBox.data=new char[metaBox.size];
memcpy(metaBox.data, metaRawData.data(), metaBox.size);
//Replace the original meta box.
for(int i=udtaExpandList.size()-1; i>-1; --i)
{
//Check the name.
if(udtaExpandList.at(i).name=="meta")
{
//Replace the item.
udtaExpandList.replace(i, metaBox);
//Stop Searching.
break;
}
}
//Combine the udta data together.
M4ABox updatedUdtaBox=zipBox("udta", udtaExpandList);
//Clear the list and original udta box.
udtaExpandList.clear();
clearBox(udtaBox);
//Replace the original udta box.
for(int i=moovExpandList.size()-1; i>-1; --i)
{
//Check the name.
if(moovExpandList.at(i).name=="udta")
{
//Replace the item
moovExpandList.replace(i, updatedUdtaBox);
//Stop searching.
break;
}
}
//Combine the moov data together.
M4ABox updatedMoovBox=zipBox("moov", moovExpandList);
//Clear the list and original moov box.
moovExpandList.clear();
clearBox(moovBox);
//Write the new moov box to the updated tag file.
writeBox(updatedMoovBox, updatedTagFile);
//Clear up the updated moov box.
clearBox(updatedMoovBox);
//Copy the left data to the updated tag file.
//Generate the music data cache.
char *turboCache=new char[DataCacheSize];
//Copy the music data from the original music file, copy the
//MusicDataCacheSize bytes once, until there's no bytes to copy.
int bytesRead=musicFile.read(turboCache, DataCacheSize);
while(bytesRead>0)
{
//Write the cache to temporary file.
updatedTagFile.write(turboCache, bytesRead);
//Read new data from the original file to cache.
bytesRead=musicFile.read(turboCache, DataCacheSize);
}
//Close the music file.
musicFile.close();
//Reset the temporary file.
updatedTagFile.reset();
//Reopen the music file as write only mode, write all the udpated tag file
//data to the music file.
if(!musicFile.open(QIODevice::WriteOnly))
{
//Close the updated tag file.
updatedTagFile.close();
//Failed to write data.
return false;
}
//Copy data from temporary file to music file.
bytesRead=updatedTagFile.read(turboCache, DataCacheSize);
while(bytesRead>0)
{
//Write the cache to music file.
musicFile.write(turboCache, bytesRead);
//Read new data from cache to the original file.
bytesRead=updatedTagFile.read(turboCache, DataCacheSize);
}
//Close the music file and temporary file.
musicFile.close();
updatedTagFile.close();
//Clear up the turbo memory.
delete[] turboCache;
//The tag rewrite is finished.
return true;
}