private byte[] downloadFileIncrementally(string claimToken)
{
int chunkSize = 16000;
int totalBytes = wsClient.DownloadFileStart(accessToken(), claimToken, chunkSize);
onDownloadStarted(totalBytes);
if (totalBytes == 0)
{
return(null);
}
int numChunks = totalBytes / chunkSize;
int fragmentChunkSize = totalBytes % chunkSize;
if (fragmentChunkSize > 0)
{
numChunks += 1;
}
// create the buffer
byte[] buffer = new byte[totalBytes];
int numDownloaded = 0;
// move the full-sized chunks
for (int i = 0; i < (numChunks - 1); i++)
{
byte[] chunk = wsClient.DownloadFilePart(accessToken(), claimToken, i);
if (chunk == null)
{
return(null);
}
Array.Copy(chunk, 0, buffer, (chunkSize * i), chunkSize);
numDownloaded += chunkSize;
onPartDownloaded(numDownloaded, totalBytes);
}
// move the fragment chunk (if any)
if (fragmentChunkSize > 0)
{
byte[] chunk = wsClient.DownloadFilePart(accessToken(), claimToken, numChunks - 1);
if (chunk == null)
{
return(null);
}
Array.Copy(chunk, 0, buffer, (numChunks - 1) * chunkSize, fragmentChunkSize);
numDownloaded += fragmentChunkSize;
onPartDownloaded(numDownloaded, totalBytes);
}
// end the download
if (wsClient.DownloadFileEnd(accessToken(), claimToken) == false)
{
return(null);
}
onDownloadEnded(totalBytes);
return(buffer);
}