// NB : This only works if writeVorbisTag is called _before_ writePictures, since tagData fusion is done by vorbisTag.Write
public bool Write(BinaryReader r, BinaryWriter w, TagData tag)
{
// Read all the fields in the existing tag (including unsupported fields)
ReadTagParams readTagParams = new ReadTagParams(true, true);
readTagParams.PrepareForWriting = true;
bool tagExists = Read(r, readTagParams);
// Save a snapshot of the initial embedded pictures for processing purposes
existingPictureIndex = 0;
targetPictureIndex = 0;
initialPictures = vorbisTag.EmbeddedPictures;
// Prepare picture data with freshly read vorbisTag
TagData dataToWrite = new TagData();
dataToWrite.Pictures = vorbisTag.EmbeddedPictures;
dataToWrite.IntegrateValues(tag, true, false); // Merge existing information + new tag information except additional fields which will be merged by VorbisComment
adjustPictureZones(dataToWrite.Pictures);
FileSurgeon surgeon = new FileSurgeon(null, null, MetaDataIOFactory.TAG_NATIVE, TO_BUILTIN);
surgeon.RewriteZones(w, new WriteDelegate(write), zones, dataToWrite, tagExists);
// Set the 'isLast' bit on the actual last block
w.BaseStream.Seek(latestBlockOffset, SeekOrigin.Begin);
w.Write((byte)(latestBlockType | FLAG_LAST_METADATA_BLOCK));
return(true);
}
public bool Write(BinaryReader r, BinaryWriter w, TagData tag)
{
bool result = true;
// Constraint-check on non-supported values
if (FieldCodeFixedLength > 0)
{
if (tag.Pictures != null)
{
foreach (PictureInfo picInfo in tag.Pictures)
{
if (PictureInfo.PIC_TYPE.Unsupported.Equals(picInfo.PicType) && (picInfo.TagType.Equals(getImplementedTagType())))
{
if ((-1 == picInfo.NativePicCode) && (Utils.ProtectValue(picInfo.NativePicCodeStr).Length != FieldCodeFixedLength))
{
throw new NotSupportedException("Field code fixed length is " + FieldCodeFixedLength + "; detected field '" + Utils.ProtectValue(picInfo.NativePicCodeStr) + "' is " + Utils.ProtectValue(picInfo.NativePicCodeStr).Length + " characters long and cannot be written");
}
}
}
}
foreach (MetaFieldInfo fieldInfo in tag.AdditionalFields)
{
if (fieldInfo.TagType.Equals(getImplementedTagType()) || MetaDataIOFactory.TAG_ANY == fieldInfo.TagType)
{
string fieldCode = Utils.ProtectValue(fieldInfo.NativeFieldCode);
if (fieldCode.Length != FieldCodeFixedLength && !fieldCode.Contains("----")) // "----" = exception for MP4 extended fields (e.g. ----:com.apple.iTunes:CONDUCTOR)
{
throw new NotSupportedException("Field code fixed length is " + FieldCodeFixedLength + "; detected field '" + fieldCode + "' is " + fieldCode.Length + " characters long and cannot be written");
}
}
}
}
structureHelper.Clear();
tagData.Pictures.Clear();
// Read all the fields in the existing tag (including unsupported fields)
ReadTagParams readTagParams = new ReadTagParams(true, true);
readTagParams.PrepareForWriting = true;
if (embedder != null && embedder.HasEmbeddedID3v2 > 0)
{
readTagParams.offset = embedder.HasEmbeddedID3v2;
}
this.read(r, readTagParams);
if (embedder != null && getImplementedTagType() == MetaDataIOFactory.TAG_ID3V2)
{
structureHelper.Clear();
structureHelper.AddZone(embedder.Id3v2Zone);
}
// Give engine something to work with if the tag is really empty
if (!tagExists && 0 == Zones.Count)
{
structureHelper.AddZone(0, 0);
}
TagData dataToWrite;
dataToWrite = tagData;
dataToWrite.IntegrateValues(tag); // Merge existing information + new tag information
dataToWrite.Cleanup();
FileSurgeon surgeon = new FileSurgeon(structureHelper, embedder, getImplementedTagType(), getDefaultTagOffset());
result = surgeon.RewriteZones(w, new FileSurgeon.WriteDelegate(writeAdapter), Zones, dataToWrite, tagExists);
// Update tag information without calling Read
/* TODO - this implementation is too risky :
* - if one of the writing operations fails, data is updated as if everything went right
* - any picture slot with a markForDeletion flag is recorded as-is in the tag
*/
tagData = dataToWrite;
return(result);
}