bool AIFFMetadata::isEmptyValue( XMP_Uns32 id, ValueObject& valueObj )
{
TValueObject<std::string>* strObj = dynamic_cast<TValueObject<std::string>*>(&valueObj);
return ( strObj == NULL || ( strObj != NULL && strObj->getValue().empty() ) );
}
XMP_Uns64 INFOMetadata::serialize( XMP_Uns8** outBuffer )
{
XMP_Uns64 size = 0;
if( outBuffer != NULL )
{
//
// calculate required buffer size
//
for( ValueMap::iterator iter=mValues.begin(); iter!=mValues.end(); iter++ )
{
TValueObject<std::string>* strObj = dynamic_cast<TValueObject<std::string>*>(iter->second);
XMP_Uns32 chunkSize = kChunkHeaderSize + strObj->getValue().length();
if( chunkSize & 1 )
{
// take account of pad byte
chunkSize++;
}
size += chunkSize;
}
size += kSizeChunkType; // add size of type "INFO"
if( size > 0 )
{
XMP_Uns8* buffer = new XMP_Uns8[static_cast<size_t>(size)]; // output buffer
memset( buffer, 0, static_cast<size_t>(size) );
const BigEndian& BE = BigEndian::getInstance();
const LittleEndian& LE = LittleEndian::getInstance();
// Put type "INFO" in front of the buffer
XMP_Uns32 typeInfo = BE.getUns32(&kType_INFO);
memcpy( buffer, &typeInfo, kSizeChunkType );
XMP_Uns64 offset = kSizeChunkType; // pointer into the buffer
//
// for each stored value
//
for( ValueMap::iterator iter=mValues.begin(); iter!=mValues.end(); iter++ )
{
//
// get: chunk data
// chunk id
// chunk size
//
TValueObject<std::string>* strObj = dynamic_cast<TValueObject<std::string>*>(iter->second);
std::string value = strObj->getValue();
XMP_Uns32 id = iter->first;
XMP_Uns32 size = value.length();
if( size & 1 && strObj->hasChanged() )
{
//
// if we modified the value of this entry
// then fill chunk data with zero bytes
// rather than use a pad byte, i.e.
// size of each LIST:INFO entry has
// an odd size
//
size++;
}
//
// chunk id and chunk size are stored in little endian format
//
id = BE.getUns32( &id );
size = LE.getUns32( &size );
//
// copy values into output buffer
//
memcpy( buffer+offset, &id, kSizeChunkID );
memcpy( buffer+offset+kSizeChunkID, &size, kSizeChunkSize );
//size has been changed in little endian format. Change it back to bigendina
size = LE.getUns32( &size );
memcpy( buffer+offset+kChunkHeaderSize, value.c_str(), size );
//
// update pointer
//
offset += kChunkHeaderSize;
offset += size;
if( size & 1 )
{
//
// take account of pad byte
offset++;
}
}
*outBuffer = buffer;
}
}
else
{
XMP_Throw ( "Invalid buffer", kXMPErr_InternalFailure );
}
return size;
}
