/// <summary>
/// オフラインプロセス開始イベント
/// </summary>
/// <returns>コルーチン</returns>
protected override System.Collections.IEnumerator OnStartedOfflineProcess()
{
if (m_DownloadWork.request != null)
{
if (!m_DownloadWork.request.isNetworkError && !m_DownloadWork.request.isHttpError)
{
m_DownloadWork.request.Dispose();
m_DownloadWork.request = null;
}
}
var cryptoHash = AssetBundleCrypto.GetCryptoHash(manager.catalog, nameWithVariant);
FileStream cryptoFile = null;
try {
cryptoFile = File.Open(m_DownloadWork.fullPath, FileMode.Open, FileAccess.Read, FileShare.Read);
} catch {
m_ErrorCode = AssetBundleErrorCode.DecryptDataNotFound;
}
if (cryptoFile != null)
{
var decryptoStream = new AssetBundleDecryptStream(cryptoFile, cryptoHash);
m_DownloadWork.createRequest = AssetBundle.LoadFromStreamAsync(decryptoStream, m_DownloadWork.crc);
yield return(m_DownloadWork.createRequest);
try {
var assetBundle = m_DownloadWork.createRequest.assetBundle;
if (assetBundle != null)
{
m_AssetBundle = assetBundle;
}
else
{
m_ErrorCode = AssetBundleErrorCode.DecryptFailed;
}
} catch {
m_ErrorCode = AssetBundleErrorCode.DecryptFailed;
}
}
if (m_ErrorCode != AssetBundleErrorCode.Null)
{
//エラー発生
manager.RemoveDeliveryStreamingAssetCache(nameWithVariant);
}
yield return(base.OnStartedOfflineProcess());
}
/// <summary>
/// コンストラクタ
/// </summary>
/// <param name="source">元データ</param>
/// <param name="cryptoHash">暗号化ハッシュ</param>
public AssetBundleDecryptStream(Stream source, int cryptoHash)
{
m_Source = source;
m_FastForwardBuffer = new byte[kFastForwardBufferSize];
var key = AssetBundleCrypto.GetCryptoKey(cryptoHash);
var iv = new byte[AssetBundleCrypto.kIVSize];
source.Read(iv, 0, iv.Length);
source.Read(m_FastForwardBuffer, 0, kFileSizeBytesSize);
m_CreateDecryptoStream = () => {
m_Source.Position = kCryptoHeaderSize;
return(AssetBundleCrypto.GetDecryptStream(m_Source, key, iv));
};
ResetDecryptoStream();
}