private static MemoryStream GetDecompressHeader(Ird ird)
{
var decompressedStream = new MemoryStream();
using (var compressedStream = new MemoryStream(ird.Header, false))
using (var gzip = new GZipStream(compressedStream, CompressionMode.Decompress))
gzip.CopyTo(decompressedStream);
decompressedStream.Seek(0, SeekOrigin.Begin);
return(decompressedStream);
}
public async Task <Ird> DownloadAsync(SearchResultItem irdInfo, string localCachePath, CancellationToken cancellationToken)
{
Ird result = null;
try
{
var localCacheFilename = Path.Combine(localCachePath, irdInfo.Filename);
// first we search local cache and try to load whatever data we can
try
{
if (File.Exists(localCacheFilename))
{
return(IrdParser.Parse(File.ReadAllBytes(localCacheFilename)));
}
}
catch (Exception e)
{
Log.Warn(e, "Error accessing local IRD cache: " + e.Message);
}
try
{
var resultBytes = await client.GetByteArrayAsync(GetDownloadLink(irdInfo.Filename)).ConfigureAwait(false);
result = IrdParser.Parse(resultBytes);
try
{
if (!Directory.Exists(localCachePath))
{
Directory.CreateDirectory(localCachePath);
}
File.WriteAllBytes(localCacheFilename, resultBytes);
}
catch (Exception ex)
{
Log.Warn(ex, $"Failed to write {irdInfo.Filename} to local cache: {ex.Message}");
}
}
catch (Exception e)
{
Log.Warn(e, $"Failed to download {irdInfo.Filename}: {e.Message}");
}
return(result);
}
catch (Exception e)
{
Log.Error(e);
return(result);
}
}
public static DiscInfo ToDiscInfo(this Ird ird)
{
List <FileRecord> fsInfo;
var sectorSize = 2048L;
using (var stream = new MemoryStream())
{
using (var headerStream = new MemoryStream(ird.Header))
using (var gzipStream = new GZipStream(headerStream, CompressionMode.Decompress))
{
gzipStream.CopyTo(stream);
}
stream.Seek(0, SeekOrigin.Begin);
var reader = new CDReader(stream, true, true);
fsInfo = reader.GetFilesystemStructure();
sectorSize = reader.ClusterSize;
}
var checksums = ird.Files.ToDictionary(f => f.Offset, f => f.Md5Checksum.ToHexString());
return(new DiscInfo
{
ProductCode = ird.ProductCode,
DiscVersion = ird.GameVersion,
DiscKeyRawData = ird.Data1.ToHexString(),
DiscKey = Decrypter.DecryptDiscKey(ird.Data1).ToHexString(),
Files = fsInfo.ToDictionary(
f => f.Filename,
f => new FileInfo
{
Offset = f.StartSector * sectorSize,
Size = f.Length,
Hashes = new Dictionary <string, string>
{
["MD5"] = checksums[f.StartSector],
}
})
});
}
