private byte[] DecompressTopicData(byte[] input, HelpTopic topic,
SerializationOptions options)
{
// The first two bytes indicates decompressed data size.
if (input.Length < 2)
{
var e = new InvalidTopicDataEventArgs(topic, input,
"Not enough bytes for DecodedLength field.");
this.InvalidTopicData?.Invoke(this, e);
return(null);
}
int decompressedLength = BitConverter.ToUInt16(input, 0);
// The rest of the buffer is a huffman stream wrapping a
// compression stream wrapping binary-encoded topic data.
byte[] output;
using (var memoryStream = new MemoryStream(input, 2, input.Length - 2))
using (var huffmanStream = new HuffmanStream(memoryStream, options.HuffmanTree))
using (var compressionStream = new CompressionStream(huffmanStream, options.Keywords))
using (var compressionReader = new BinaryReader(compressionStream))
{
output = compressionReader.ReadBytes(decompressedLength);
}
if (output.Length != decompressedLength)
{
var e = new InvalidTopicDataEventArgs(topic, input,
string.Format("Decompressed topic size mismatch: " +
"expecting {0} bytes, got {1} bytes.",
decompressedLength, output.Length));
this.InvalidTopicData?.Invoke(this, e);
}
return(output);
}
private void OnInvalidTopicData(object sender, QuickHelp.Serialization.InvalidTopicDataEventArgs e)
{
this.deserializationErrors.Add(e);
}
