84 lines
2.5 KiB
Go
84 lines
2.5 KiB
Go
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package httphead
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// OctetType desribes character type.
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//
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// From the "Basic Rules" chapter of RFC2616
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// See https://tools.ietf.org/html/rfc2616#section-2.2
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//
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// OCTET = <any 8-bit sequence of data>
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// CHAR = <any US-ASCII character (octets 0 - 127)>
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// UPALPHA = <any US-ASCII uppercase letter "A".."Z">
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// LOALPHA = <any US-ASCII lowercase letter "a".."z">
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// ALPHA = UPALPHA | LOALPHA
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// DIGIT = <any US-ASCII digit "0".."9">
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// CTL = <any US-ASCII control character (octets 0 - 31) and DEL (127)>
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// CR = <US-ASCII CR, carriage return (13)>
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// LF = <US-ASCII LF, linefeed (10)>
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// SP = <US-ASCII SP, space (32)>
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// HT = <US-ASCII HT, horizontal-tab (9)>
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// <"> = <US-ASCII double-quote mark (34)>
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// CRLF = CR LF
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// LWS = [CRLF] 1*( SP | HT )
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//
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// Many HTTP/1.1 header field values consist of words separated by LWS
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// or special characters. These special characters MUST be in a quoted
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// string to be used within a parameter value (as defined in section
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// 3.6).
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//
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// token = 1*<any CHAR except CTLs or separators>
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// separators = "(" | ")" | "<" | ">" | "@"
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// | "," | ";" | ":" | "\" | <">
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// | "/" | "[" | "]" | "?" | "="
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// | "{" | "}" | SP | HT
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type OctetType byte
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// IsChar reports whether octet is CHAR.
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func (t OctetType) IsChar() bool { return t&octetChar != 0 }
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// IsControl reports whether octet is CTL.
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func (t OctetType) IsControl() bool { return t&octetControl != 0 }
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// IsSeparator reports whether octet is separator.
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func (t OctetType) IsSeparator() bool { return t&octetSeparator != 0 }
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// IsSpace reports whether octet is space (SP or HT).
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func (t OctetType) IsSpace() bool { return t&octetSpace != 0 }
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// IsToken reports whether octet is token.
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func (t OctetType) IsToken() bool { return t&octetToken != 0 }
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const (
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octetChar OctetType = 1 << iota
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octetControl
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octetSpace
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octetSeparator
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octetToken
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)
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// OctetTypes is a table of octets.
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var OctetTypes [256]OctetType
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func init() {
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for c := 32; c < 256; c++ {
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var t OctetType
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if c <= 127 {
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t |= octetChar
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}
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if 0 <= c && c <= 31 || c == 127 {
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t |= octetControl
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}
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switch c {
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case '(', ')', '<', '>', '@', ',', ';', ':', '"', '/', '[', ']', '?', '=', '{', '}', '\\':
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t |= octetSeparator
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case ' ', '\t':
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t |= octetSpace | octetSeparator
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}
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if t.IsChar() && !t.IsControl() && !t.IsSeparator() && !t.IsSpace() {
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t |= octetToken
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}
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OctetTypes[c] = t
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}
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}
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