BOOST ASIO: How to use limited buffer size with async_read_until?

When the provided buffer is not big enough async_read_until fills it in completely and then invokes the read handler with the error code asio::error::not_found meaning that the delimiter was not found.

When the provided buffer is not big enough, async_read_until fills it in completely and then invokes the read handler with the error code asio::error::not_found, meaning that the delimiter was not found. At that point you can .consume() some (or all) data from the buffer and call async_read_until again. It may be difficult to guarantee, with a 128-byte buffer, that when the delimiter is finally found, it is in the exact last position in the buffer (and even then, with a four-byte delimiter, you will only have the last 124 bytes prior to it).

It may be best to use a larger buffer and buffer. Consume(buffer.size()-128) in the not_found error handler, to make sure there's at least 128 bytes free at all time.

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