/**
*
* 使用方法:
* 1，入bytebuf后 把bytebuf发送出去,并释放bytebuf
* 2，判断返回值是否为null，如果不为null发送出去并释放它
*
* headerOffset +6字节fectHead + 2字节bodylenth(lenth-headerOffset-6)
*
* 1,对数据写入头标记为数据类型 markData
* 2,写入消息长度
* 3,获得缓存数据中最大长度，其他的缓存进行扩容到同样长度
* 4,去掉头长度，进行fec编码
* 5,对冗余字节数组进行标记为fec makefec
* 6,返回完整长度
*
* 注意: 传入的bytebuf如果需要释放在传入后手动释放。
* 返回的bytebuf 也需要自己释放
* @param byteBuf
* @return
*/
public IByteBuffer[] encode(IByteBuffer byteBuf)
{
markData(byteBuf, headerOffset);
int sz = byteBuf.WriterIndex;
byteBuf.SetShort(payloadOffset, sz - headerOffset - Fec.fecHeaderSizePlus2);
this.shardCache[shardCount] = byteBuf.RetainedDuplicate();
this.shardCount++;
if (sz > this.maxSize)
{
this.maxSize = sz;
}
if (shardCount != dataShards)
{
return(null);
}
//填充parityShards
for (int i = 0; i < parityShards; i++)
{
IByteBuffer parityByte = PooledByteBufferAllocator.Default.DirectBuffer(this.maxSize);
shardCache[i + dataShards] = parityByte;
encodeCache[i] = parityByte;
markParity(parityByte, headerOffset);
parityByte.SetWriterIndex(this.maxSize);
}
//按着最大长度不足补充0
for (var i = 0; i < this.dataShards; i++)
{
var shard = shardCache[i];
var left = this.maxSize - shard.WriterIndex;
if (left <= 0)
{
continue;
}
//是否需要扩容 会出现吗？？
//if(shard.capacity()<this.maxSize){
// ByteBuf newByteBuf = ByteBufAllocator.DEFAULT.buffer(this.maxSize);
// newByteBuf.writeBytes(shard);
// shard.release();
// shard = newByteBuf;
// shardCache[i] = shard;
//}
shard.WriteBytes(zeros, left);
zeros.SetReaderIndex(0);
}
codec.encodeParity(shardCache, payloadOffset, this.maxSize - payloadOffset);
//释放dataShards
for (int i = 0; i < dataShards; i++)
{
this.shardCache[i].Release();
this.shardCache[i] = null;
}
this.shardCount = 0;
this.maxSize = 0;
return(this.encodeCache);
}