void id3::v2::render(ID3_Writer& writer, const ID3_TagImpl& tag)
{
// There has to be at least one frame for there to be a tag...
if (tag.NumFrames() == 0)
{
ID3D_WARNING( "id3::v2::render(): no frames to render" );
return;
}
ID3D_NOTICE( "id3::v2::render(): rendering" );
ID3_TagHeader hdr;
hdr.SetSpec(tag.GetSpec());
hdr.SetExtended(tag.GetExtended());
hdr.SetExperimental(tag.GetExperimental());
// set up the encryption and grouping IDs
// ...
String frms;
io::StringWriter frmWriter(frms);
if (!tag.GetUnsync())
{
ID3D_NOTICE( "id3::v2::render(): rendering frames" );
renderFrames(frmWriter, tag);
hdr.SetUnsync(false);
}
else
{
ID3D_NOTICE( "id3::v2::render(): rendering unsynced frames" );
io::UnsyncedWriter uw(frmWriter);
renderFrames(uw, tag);
uw.flush();
ID3D_NOTICE( "id3::v2::render(): numsyncs = " << uw.getNumSyncs() );
hdr.SetUnsync(uw.getNumSyncs() > 0);
}
size_t frmSize = frms.size();
if (frmSize == 0)
{
ID3D_WARNING( "id3::v2::render(): rendered frame size is 0 bytes" );
return;
}
// zero the remainder of the buffer so that our padding bytes are zero
luint nPadding = tag.PaddingSize(frmSize);
ID3D_NOTICE( "id3::v2::render(): padding size = " << nPadding );
hdr.SetDataSize(frmSize + nPadding);
hdr.Render(writer);
writer.writeChars(frms.data(), frms.size());
for (size_t i = 0; i < nPadding; ++i)
{
if (writer.writeChar('\0') == ID3_Writer::END_OF_WRITER)
{
break;
}
}
}
luint ID3_Tag::Size( void )
{
luint bytesUsed = 0;
ID3_Elem *cur = frameList;
ID3_TagHeader header;
header.SetVersion ( m_nVersion, m_nRevision );
bytesUsed += header.Size();
while( cur )
{
// PL
if( ( cur->frame->GetID() <= 0 ) || (cur->frame->GetID() > ID3FID_CRYPTOREG ))
{
// TRACE( "Invalide FrameID\n" );
cur = cur->next;
continue;
}
// End PL
if( cur->frame )
{
cur->frame->SetVersion ( m_nVersion, m_nRevision );
bytesUsed += cur->frame->Size();
}
cur = cur->next;
}
// add 30% for sync
if ( m_bSyncOn )
bytesUsed += bytesUsed / 3;
bytesUsed += PaddingSize ( bytesUsed );
return bytesUsed;
}
size_t ID3_TagImpl::Size() const
{
if (this->NumFrames() == 0)
{
return 0;
}
ID3_TagHeader hdr;
hdr.SetSpec(this->GetSpec());
size_t bytesUsed = hdr.Size();
size_t frameBytes = 0;
for (const_iterator cur = _frames.begin(); cur != _frames.end(); ++cur)
{
if (*cur)
{
(*cur)->SetSpec(this->GetSpec());
frameBytes += (*cur)->Size();
}
}
if (!frameBytes)
{
return 0;
}
bytesUsed += frameBytes;
// add 30% for sync
if (this->GetUnsync())
{
bytesUsed += bytesUsed / 3;
}
bytesUsed += this->PaddingSize(bytesUsed);
return bytesUsed;
}
luint ID3_Tag::Render( uchar *buffer )
{
luint bytesUsed = 0;
if ( buffer )
{
ID3_Elem *cur = frameList;
ID3_TagHeader header;
SetVersion ( ID3_TAGVERSION, ID3_TAGREVISION );
header.SetVersion ( m_nVersion, m_nRevision );
bytesUsed += header.Size();
// set up the encryption and grouping IDs
// ...
while( cur )
{
// PL
// Check that frame has a valid FrameID
if( ( cur->frame->GetID() <= 0 ) || (cur->frame->GetID() > ID3FID_CRYPTOREG ))
{
// TRACE( "Invalide FrameID\n" );
cur = cur->next;
continue;
}
// End PL
if ( cur->frame )
{
cur->frame->compression = m_bCompression;
cur->frame->SetVersion ( m_nVersion, m_nRevision );
bytesUsed += cur->frame->Render ( &buffer[ bytesUsed ] );
}
cur = cur->next;
}
if ( m_bSyncOn )
{
uchar *tempz;
luint newTagSize;
newTagSize = GetUnSyncSize ( &buffer[ header.Size() ], bytesUsed - header.Size() );
if ( newTagSize > 0 && ( newTagSize + header.Size() ) > bytesUsed )
{
#ifdef _DEBUG
// ASSERT( newTagSize < MAX_ALLOC ); // PL
#endif
if ( tempz = new uchar[ newTagSize ] )
{
UnSync ( tempz, newTagSize, &buffer[ header.Size() ], bytesUsed - header.Size() );
header.SetFlags ( ID3HF_UNSYNC );
memcpy ( &buffer[ header.Size() ], tempz, newTagSize );
bytesUsed = newTagSize + header.Size();
delete[] tempz;
}
else
ID3_THROW ( ID3E_NoMemory );
}
}
// zero the remainder of the buffer so that our
// padding bytes are zero
for ( luint i = 0; i < PaddingSize ( bytesUsed ); i++ )
buffer[ bytesUsed + i ] = 0;
bytesUsed += PaddingSize ( bytesUsed );
header.SetDataSize ( bytesUsed - header.Size() );
header.Render ( buffer );
}
else
ID3_THROW ( ID3E_NoBuffer );
// set the flag which says that the tag hasn't changed
m_bHasChanged = false;
return bytesUsed;
}
bool id3::v2::parse(ID3_TagImpl& tag, ID3_Reader& reader)
{
ID3_Reader::pos_type beg = reader.getCur();
io::ExitTrigger et(reader);
ID3_TagHeader hdr;
io::WindowedReader wr(reader, ID3_TagHeader::SIZE);
if (!hdr.Parse(wr) || wr.getCur() == beg)
{
ID3D_NOTICE( "id3::v2::parse(): parsing header failes" );
return false;
}
if (hdr.GetExtended())
{
hdr.ParseExtended(reader);
}
tag.SetSpec(hdr.GetSpec());
size_t dataSize = hdr.GetDataSize();
ID3D_NOTICE( "ID3_TagImpl::Parse(ID3_Reader&): dataSize = " << dataSize);
wr.setWindow(wr.getCur(), dataSize);
et.setExitPos(wr.getEnd());
ID3D_NOTICE( "ID3_TagImpl::Parse(ID3_Reader&): data window beg = " << wr.getBeg() );
ID3D_NOTICE( "ID3_TagImpl::Parse(ID3_Reader&): data window cur = " << wr.getCur() );
ID3D_NOTICE( "ID3_TagImpl::Parse(ID3_Reader&): data window end = " << wr.getEnd() );
tag.SetExtended(hdr.GetExtended());
if (!hdr.GetUnsync())
{
tag.SetUnsync(false);
parseFrames(tag, wr);
}
else
{
// The buffer has been unsynced. It will have to be resynced to be
// readable. This has to be done a character at a time.
//
// The original reader may be reading in characters from a file. Doing
// this a character at a time is quite slow. To improve performance, read
// in the entire buffer into a string, then create an UnsyncedReader from
// the string.
//
// It might be better to implement a BufferedReader so that the details
// of this can be abstracted away behind a class
tag.SetUnsync(true);
BString raw = io::readAllBinary(wr);
io::BStringReader bsr(raw);
io::UnsyncedReader ur(bsr);
ID3D_NOTICE( "ID3_TagImpl::Parse(ID3_Reader&): unsync beg = " << ur.getBeg() );
ID3D_NOTICE( "ID3_TagImpl::Parse(ID3_Reader&): unsync cur = " << ur.getCur() );
ID3D_NOTICE( "ID3_TagImpl::Parse(ID3_Reader&): unsync end = " << ur.getEnd() );
// Now read the UnsyncedReader into another string, and parse the frames
// from the string. This is done so that 1. the unsynced reader is
// unsynced exactly once, removing the possibility of multiple unsyncings
// of the same string, and 2) so that calls to readChars aren't done a
// character at a time for every call
BString synced = io::readAllBinary(ur);
io::BStringReader sr(synced);
parseFrames(tag, sr);
}
return true;
}