public FileViewModel(FileType type, AppxFile file) : this(type)
{
this.Name = file.Name;
this.UpdateImpact = file.UpdateImpact;
this.SizeDifference = type == FileType.Unchanged ? 0 : file.SizeDifference;
}
private async Task <IList <AppxFile> > GetFiles(Stream appxBlockMap, CancellationToken cancellationToken, IProgress <ProgressData> progress = null)
{
progress?.Report(new ProgressData(0, "Reading AppxBlockMap.xml..."));
IList <AppxFile> list = new List <AppxFile>();
var document = await XDocument.LoadAsync(appxBlockMap, LoadOptions.None, cancellationToken);
var blockMap = document.Root;
if (blockMap == null || blockMap.Name.LocalName != "BlockMap")
{
return(list);
}
var ns = XNamespace.Get("http://schemas.microsoft.com/appx/2010/blockmap");
const int maxBlockSize = 64 * 1024; // 64 kilobytes
progress?.Report(new ProgressData(50, "Reading files..."));
foreach (var item in blockMap.Elements(ns + "File"))
{
long.TryParse(item.Attribute("Size")?.Value ?? "0", out var fileSize);
ushort headerLength;
var headerSize = item.Attribute("LfhSize");
if (headerSize == null)
{
headerLength = 30;
}
else
{
ushort.TryParse(headerSize.Value, out headerLength);
}
var fileName = item.Attribute("Name")?.Value;
var file = new AppxFile(fileName, fileSize, headerLength);
foreach (var fileBlock in item.Elements(ns + "Block"))
{
long blockLength;
var blockSize = fileBlock.Attribute("Size");
if (blockSize == null)
{
// If this is null, the block is uncompressed.
if (fileSize > maxBlockSize)
{
blockLength = maxBlockSize;
}
else
{
blockLength = fileSize;
}
fileSize -= maxBlockSize;
}
else
{
long.TryParse(blockSize.Value, out blockLength);
}
file.Blocks.Add(new AppxBlock(fileBlock.Attribute("Hash")?.Value, blockLength)
{
Status = ComparisonStatus.Unchanged
});
}
list.Add(file);
}
return(list);
}
public FileViewModel(AppxFile changedFile) : this(FileType.Changed)
{
this.Name = changedFile.Name;
this.UpdateImpact = changedFile.UpdateImpact;
this.SizeDifference = changedFile.SizeDifference;
}
