http::read_some (2 of 2 overloads)

Read part of a message from a stream using a parser.

Synopsis

Defined in header <boost/beast/http/read.hpp>

template<
    class SyncReadStream,
    class DynamicBuffer,
    bool isRequest,
    class Derived>
std::size_t
read_some(
    SyncReadStream& stream,
    DynamicBuffer& buffer,
    basic_parser< isRequest, Derived >& parser,
    error_code& ec);

Description

This function is used to read part of a message from a stream into a subclass of http::basic_parser. The call will block until one of the following conditions is true:

A call to http::basic_parser::put with a non-empty buffer sequence is successful.
An error occurs.

This operation is implemented in terms of one or more calls to the stream's read_some function. The implementation may read additional octets that lie past the end of the message being read. This additional data is stored in the dynamic buffer, which must be retained for subsequent reads.

If the stream returns the error boost::asio::error::eof indicating the end of file during a read, the error returned from this function will be:

http::end_of_stream if no octets were parsed, or
http::partial_message if any octets were parsed but the message was incomplete, otherwise:
A successful result. A subsequent attempt to read will return http::end_of_stream

The function returns the number of bytes processed from the dynamic buffer. The caller should remove these bytes by calling consume on the dynamic buffer, regardless of any error.

Parameters

Name	Description
`stream`	The stream from which the data is to be read. The type must support the SyncReadStream concept.
`buffer`	A DynamicBuffer holding additional bytes read by the implementation from the stream. This is both an input and an output parameter; on entry, any data in the dynamic buffer's input sequence will be given to the parser first.
`parser`	The parser to use.
`ec`	Set to the error, if any occurred.

Return Value

The number of bytes transferred to the parser.

Convenience header <boost/beast/http.hpp>