erlang decode_packet(Type, Bin, Options)用法及代码示例

erlang:decode_packet(Type, Bin, Options) ->
                        {ok, Packet, Rest} |
                        {more, Length} |
                        {error, Reason}

类型：

Type = 
    raw | 0 | 1 | 2 | 4 | asn1 | cdr | sunrm | fcgi | tpkt |
    line | http | http_bin | httph | httph_bin

Bin = binary()

Options = [Opt]

Opt = 
    {packet_size, integer() >= 0} |
    {line_length, integer() >= 0}

Packet = binary() | HttpPacket

Rest = binary()

Length = integer() >= 0 | undefined

Reason = term()

HttpPacket = 
    HttpRequest | HttpResponse | HttpHeader | http_eoh | HttpError

HttpRequest = {http_request, HttpMethod, HttpUri, HttpVersion}

HttpResponse = 
    {http_response, HttpVersion, integer(), HttpString}

HttpHeader = 
    {http_header,
 integer(),
     HttpField,
     UnmodifiedField :: HttpString,
     Value :: HttpString}

HttpError = {http_error, HttpString}

HttpMethod = 
    'OPTIONS' | 'GET' | 'HEAD' | 'POST' | 'PUT' | 'DELETE' |
    'TRACE' | HttpString

HttpUri = 
    '*' |
    {absoluteURI,
     http | https,
     Host :: HttpString,
     Port :: inet:port_number() | undefined,
     Path :: HttpString} |
    {scheme, Scheme :: HttpString, HttpString} |
    {abs_path, HttpString} |
    HttpString

HttpVersion = 
    {Major :: integer() >= 0, Minor :: integer() >= 0}

HttpField = 
    'Cache-Control' | 'Connection' | 'Date' | 'Pragma' |
    'Transfer-Encoding' | 'Upgrade' | 'Via' | 'Accept' |
    'Accept-Charset' | 'Accept-Encoding' | 'Accept-Language' |
    'Authorization' | 'From' | 'Host' | 'If-Modified-Since' |
    'If-Match' | 'If-None-Match' | 'If-Range' |
    'If-Unmodified-Since' | 'Max-Forwards' |
    'Proxy-Authorization' | 'Range' | 'Referer' | 'User-Agent' |
    'Age' | 'Location' | 'Proxy-Authenticate' | 'Public' |
    'Retry-After' | 'Server' | 'Vary' | 'Warning' |
    'Www-Authenticate' | 'Allow' | 'Content-Base' |
    'Content-Encoding' | 'Content-Language' | 'Content-Length' |
    'Content-Location' | 'Content-Md5' | 'Content-Range' |
    'Content-Type' | 'Etag' | 'Expires' | 'Last-Modified' |
    'Accept-Ranges' | 'Set-Cookie' | 'Set-Cookie2' |
    'X-Forwarded-For' | 'Cookie' | 'Keep-Alive' |
    'Proxy-Connection' | HttpString

HttpString = string() | binary()

> erlang:decode_packet(1,<<3,"abcd">>,[]).
{ok,<<"abc">>,<<"d">>}
> erlang:decode_packet(1,<<5,"abcd">>,[]).
{more,6}