internal override Command Decode(int prefix, Func <int> nextByte)
{
Delta nd = DeltaDecoder.DecodeNd((prefix & 0b11111000) >> 3);
Delta fd = DeltaDecoder.DecodeFd(nextByte(), nextByte(), nextByte());
return(Commands.GFill(nd, fd));
}
public override Result <ProcessedPayload> Decode(IPayload payload, DecodingContext context)
{
var logger = context.ChannelOptions?.Logger ?? DefaultLogger.LoggerInstance;
if (payload == null)
{
return(Result.Ok(new ProcessedPayload()));
}
try
{
var payloadBytes = DataHelpers.ConvertToByteArray(payload.Data);
var previousPayload = context.PreviousPayload?.GetBytes();
if (previousPayload is null)
{
return(Result.Fail <ProcessedPayload>(new VcDiffErrorInfo("Missing previous payload")));
}
var result = DeltaDecoder.ApplyDelta(previousPayload, payloadBytes);
var nextEncoding = RemoveCurrentEncodingPart(payload);
context.PreviousPayload = new PayloadCache(result.AsByteArray(), nextEncoding);
return(Result.Ok(new ProcessedPayload(
result.AsByteArray(),
RemoveCurrentEncodingPart(payload))));
}
catch (Exception ex)
{
var error =
$"Payload Encoding: {payload.Encoding}. Payload data: {GetPayloadString()}";
logger.Error("Error decoding vcdiff message: " + error, ex);
return(Result.Fail <ProcessedPayload>(new VcDiffErrorInfo("Failed to decode vcdiff message", ex)));
}
string GetPayloadString()
{
try
{
if (payload.Data == null)
{
return("null");
}
if (payload.Data is byte[])
{
return((payload.Data as byte[]).ToBase64());
}
if (payload.Data is string)
{
return(payload.Data as string);
}
return(string.Empty);
}
catch
{
return(string.Empty);
}
}
}