net.mamoe.mirai.utils.kotlinx.coroutines.io.ByteReadChannel

copyAndClose	从接收者管道读取所有数据并写入 dst, 最终关闭 dst `suspend fun ByteReadChannel.copyAndClose(dst: OutputStream): Unit` `suspend fun ByteReadChannel.copyAndClose(dst: Output): Unit` `suspend fun ByteReadChannel.copyAndClose(dst: ByteWriteChannel): Unit` `suspend fun ByteReadChannel.copyAndClose(dst: ByteWriteChannel): Unit`
copyTo	从接收者管道读取所有数据并写入 dst. 不会关闭 dst `suspend fun ByteReadChannel.copyTo(dst: OutputStream): Unit` `suspend fun ByteReadChannel.copyTo(dst: Output): Unit` `suspend fun ByteReadChannel.copyTo(dst: ByteWriteChannel): Unit`
toExternalImage	保存为临时文件然后调用 File.toExternalImage. `suspend fun ByteReadChannel.toExternalImage(): ExternalImage`