/// <summary>Decompresses headers from a <see cref="SPDYFrameType.Headers"/>, <see cref="SPDYFrameType.Reply"/>, or
/// <see cref="SPDYFrameType.Stream"/> frame.
/// </summary>
/// <remarks>Because the compressed stream spans all frames read in the connection, only one thread may be decompressing headers
/// at any given time.
/// </remarks>
public Dictionary <string, List <string> > DecompressHeaders(byte[] data, int index, int length)
{
byte[] dec = decompressor.Transform(data, index, length, ZlibFlush.Sync).ToArray(); // decompress it
int count = SPDYFrame.ReadInt(dec, 0), i = 4; // the first field is the number of headers
var headers = new Dictionary <string, List <string> >(count);
while (--count >= 0) // for each header...
{
int byteCount = SPDYFrame.ReadInt(dec, i); // read the key length
string key = Encoding.UTF8.GetString(dec, i + 4, byteCount); // and the key itself
i = i + 4 + byteCount;
byteCount = SPDYFrame.ReadInt(dec, i); // now read the values length
i += 4;
var values = new List <string>();
for (int end = i + byteCount; i < end;)
{
int sep = i; // scan for the end of the current value
while (sep < end && data[sep] != 0)
{
sep++; // if we get to the end or see a NUL byte, stop
}
values.Add(Encoding.UTF8.GetString(dec, i, sep - i)); // add the value
i = sep; // and move past it
if (sep < end)
{
i++; // if we stopped at a NUL byte, move past that too
}
}
headers[key] = values;
}
return(headers);
}
