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using System.IO;
using System.Threading.Tasks;
using System.Xml.Linq;
using VersOne.Epub.Environment;
using VersOne.Epub.Options;
namespace VersOne.Epub.Internal
{
internal class RootFilePathReader
{
private readonly EpubReaderOptions epubReaderOptions;
public RootFilePathReader(EpubReaderOptions? epubReaderOptions = null)
{
this.epubReaderOptions = epubReaderOptions ?? new EpubReaderOptions();
}
public async Task<string> GetRootFilePathAsync(IZipFile epubFile)
{
const string EPUB_CONTAINER_FILE_PATH = "META-INF/container.xml";
IZipFileEntry? containerFileEntry = epubFile.GetEntry(EPUB_CONTAINER_FILE_PATH) ??
throw new EpubContainerException($"EPUB parsing error: \"{EPUB_CONTAINER_FILE_PATH}\" file not found in the EPUB file.");
XDocument containerDocument;
using (Stream containerStream = containerFileEntry.Open())
{
containerDocument = await XmlUtils.LoadDocumentAsync(containerStream, epubReaderOptions.XmlReaderOptions).ConfigureAwait(false);
}
XNamespace cnsNamespace = "urn:oasis:names:tc:opendocument:xmlns:container";
XAttribute? fullPathAttribute =
containerDocument.Element(cnsNamespace + "container")?.Element(cnsNamespace + "rootfiles")?.Element(cnsNamespace + "rootfile")?.Attribute("full-path") ??
throw new EpubContainerException("EPUB parsing error: root file path not found in the EPUB container.");
return fullPathAttribute.Value;
}
}
}
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