/// <summary>
/// Loads a segment from the binary data beginning at the specified position.
/// </summary>
/// <param name="fileId">File record identifier.</param>
/// <param name="position">Starting position of the segment.</param>
/// <param name="count">Number of bytes to load.</param>
/// <returns>Byte array containing the requested number of bytes (or less if there is not enough in the binary data).</returns>
protected internal static byte[] LoadBinaryFragment(int fileId, long position, int count)
{
var ctx = GetBlobStorageContext(fileId);
var provider = ctx.Provider;
if (provider == BuiltInProvider)
{
return(BuiltInBlobProvider.ReadRandom(ctx, position, count));
}
var realCount = Convert.ToInt32(Math.Min(ctx.Length - position, count));
var bytes = new byte[realCount];
using (var stream = provider.GetStreamForRead(ctx))
{
stream.Seek(position, SeekOrigin.Begin);
stream.Read(bytes, 0, realCount);
}
return(bytes);
}
/// <summary>
/// Loads a segment from the binary data beginning at the specified position.
/// </summary>
/// <param name="fileId">File record identifier.</param>
/// <param name="position">Starting position of the segment.</param>
/// <param name="count">Number of bytes to load.</param>
/// <param name="cancellationToken">The token to monitor for cancellation requests.</param>
/// <returns>A Task that represents the asynchronous operation containing
/// a byte array containing the requested number of bytes (or less if there is not enough in the binary data).</returns>
protected internal static async Task <byte[]> LoadBinaryFragmentAsync(int fileId, long position, int count,
CancellationToken cancellationToken)
{
var ctx = await GetBlobStorageContextAsync(fileId, cancellationToken).ConfigureAwait(false);
var provider = ctx.Provider;
if (provider == BuiltInProvider)
{
return(BuiltInBlobProvider.ReadRandom(ctx, position, count));
}
var realCount = Convert.ToInt32(Math.Min(ctx.Length - position, count));
var bytes = new byte[realCount];
using (var stream = provider.GetStreamForRead(ctx))
{
stream.Seek(position, SeekOrigin.Begin);
stream.Read(bytes, 0, realCount);
}
return(bytes);
}