public async Task <byte[]> ExportToZip()
{
using (var memoryStream = new MemoryStream())
{
using (var archive = new ZipArchive(memoryStream, ZipArchiveMode.Create, true))
{
var files = (await LocalStorageRepository.GetKeys()).OrderBy(f => f).ToArray();
using (var hash = new MD5CompositeHash())
{
foreach (var file in files)
{
var entry = archive.CreateEntry(file);
using (var entryStream = entry.Open())
{
using (var streamWriter = new StreamWriter(entryStream))
{
var content = await LocalStorageRepository.GetItem(file);
streamWriter.Write(content);
hash.Add(file);
hash.Add(content);
}
}
}
var hashEntry = archive.CreateEntry(SignatureName);
using (var entryStream = hashEntry.Open())
{
using (var streamWriter = new StreamWriter(entryStream))
{
streamWriter.Write(hash.Hash.ToString());
}
}
}
}
return(memoryStream.ToArray());
}
}
public static bool ValidateZip(byte[] zip)
{
if (zip == null)
{
throw new ArgumentNullException(nameof(zip));
}
var signature = String.Empty;
using (var hash = new MD5CompositeHash())
{
using (var memoryStream = new MemoryStream(zip))
{
using (var archive = new ZipArchive(memoryStream, ZipArchiveMode.Read, true))
{
foreach (var entry in archive.Entries.OrderBy(n => n.Name))
{
using (var entryStream = entry.Open())
{
using (var streamWriter = new StreamReader(entryStream))
{
var content = streamWriter.ReadToEnd();
if (entry.Name == SignatureName)
{
signature = content;
}
else
{
hash.Add(entry.Name);
hash.Add(content);
}
}
}
}
}
}
return(signature == hash.Hash.ToString());
}
}