Read a complete message header from a stream using a parser.
Defined in header
template< class SyncReadStream, class DynamicBuffer, bool isRequest> std::size_t read_header( SyncReadStream& stream, DynamicBuffer& buffer, basic_parser< isRequest >& parser);
This function is used to read a complete message header from a stream into
an instance of
basic_parser. The call will block
until one of the following conditions is true:
This operation is implemented in terms of one or more calls to the stream's
read_some function. The
implementation may read additional bytes from the stream that lie past
the end of the message being read. These additional bytes are stored in
the dynamic buffer, which must be preserved for subsequent reads. If the
end of file error is received while reading from the stream, then the error
returned from this function will be:
The stream from which the data is to be read. The type must meet the SyncReadStream requirements.
Storage for additional bytes read by the implementation from the stream. This is both an input and an output parameter; on entry, the parser will be presented with any remaining data in the dynamic buffer's readable bytes sequence first. The type must meet the DynamicBuffer requirements.
The parser to use.
The number of bytes transferred from the stream.
Thrown on failure.
The function returns the total number of bytes transferred from the stream.
This may be zero for the case where there is sufficient pre-existing message
data in the dynamic buffer. The implementation will call
basic_parser::eager with the value
false on the parser passed in.