/// <summary>
/// Step 2: Read Metadata (OPF file).
/// </summary>
/// <returns>Formatted OPFDocument with all the metadata and book info.</returns>
private async Task <OPFDocument> ReadMetadata()
{
if (RootEpubFolder != null)
{
var metainfFolder = await RootEpubFolder.GetFolderAsync("META-INF");
if (metainfFolder != null)
{
//get container.xml file
StorageFile containerFile = await StorageFile.GetFileFromPathAsync(Path.Combine(metainfFolder.Path, "container.xml"));
//create a new XmlDeserializer to deserialize Container Content
Deserializer = new XmlSerializer(typeof(Container));
using (var containerStream = await containerFile.OpenStreamForReadAsync())
{
var containerXML = (Container)Deserializer.Deserialize(containerStream);
//get contents.opf file from epub directory
var opfFile = await StorageFile.GetFileFromPathAsync(Path.Combine(RootEpubFolder.Path, containerXML.Rootfiles.Rootfile.Fullpath.Replace('/', '\\')));
//set OPFFolder for later use.
OPFFolder = await opfFile.GetParentAsync();
//Reset the deserializer with new content type
Deserializer = new XmlSerializer(typeof(OPFDocument));
using (var opfStream = await opfFile.OpenStreamForReadAsync())
{
return((OPFDocument)Deserializer.Deserialize(opfStream));
}
}
}
}
return(null);
}
/// <summary>
/// Step 2: Read & Save CSS Files
/// </summary>
/// <returns>Minified CSS</returns>
private async Task <string> ReadCSSFiles()
{
if (RootEpubFolder != null)
{
//query for all css files
var query = RootEpubFolder.CreateFileQueryWithOptions(DirectoryHelper.GetQueryOptions(new string[] { ".css" }));
//variable to hold all the css.
string css = "";
foreach (var file in await query.GetFilesAsync())
{
//TODO: use a different method for reading text i.e. Filestreams
css += await FileIO.ReadTextAsync(file);
//Delete css file, we no longer need it.
await file.DeleteAsync(StorageDeleteOption.PermanentDelete);
}
//minify CSS to decrease size (just removes whitespaces).
return(Minifiers.MinifyCSS(css));
}
return(null);
}
