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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [net/] [http/] [lex.go] - Blame information for rev 848

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Line No. Rev Author Line
1 747 jeremybenn 
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package http
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// This file deals with lexical matters of HTTP
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func isSeparator(c byte) bool {
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        switch c {
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        case '(', ')', '<', '>', '@', ',', ';', ':', '\\', '"', '/', '[', ']', '?', '=', '{', '}', ' ', '\t':
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                return true
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        }
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        return false
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}
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func isSpace(c byte) bool {
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        switch c {
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        case ' ', '\t', '\r', '\n':
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                return true
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        }
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        return false
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}
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func isCtl(c byte) bool { return (0 <= c && c <= 31) || c == 127 }
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func isChar(c byte) bool { return 0 <= c && c <= 127 }
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func isAnyText(c byte) bool { return !isCtl(c) }
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func isQdText(c byte) bool { return isAnyText(c) && c != '"' }
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func isToken(c byte) bool { return isChar(c) && !isCtl(c) && !isSeparator(c) }
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// Valid escaped sequences are not specified in RFC 2616, so for now, we assume
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// that they coincide with the common sense ones used by GO. Malformed
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// characters should probably not be treated as errors by a robust (forgiving)
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// parser, so we replace them with the '?' character.
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func httpUnquotePair(b byte) byte {
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        // skip the first byte, which should always be '\'
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        switch b {
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        case 'a':
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                return '\a'
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        case 'b':
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                return '\b'
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        case 'f':
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                return '\f'
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        case 'n':
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                return '\n'
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        case 'r':
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                return '\r'
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        case 't':
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                return '\t'
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        case 'v':
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                return '\v'
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        case '\\':
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                return '\\'
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        case '\'':
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                return '\''
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        case '"':
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                return '"'
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        }
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        return '?'
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}
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// raw must begin with a valid quoted string. Only the first quoted string is
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// parsed and is unquoted in result. eaten is the number of bytes parsed, or -1
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// upon failure.
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func httpUnquote(raw []byte) (eaten int, result string) {
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        buf := make([]byte, len(raw))
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        if raw[0] != '"' {
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                return -1, ""
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        }
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        eaten = 1
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        j := 0 // # of bytes written in buf
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        for i := 1; i < len(raw); i++ {
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                switch b := raw[i]; b {
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                case '"':
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                        eaten++
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                        buf = buf[0:j]
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                        return i + 1, string(buf)
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                case '\\':
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                        if len(raw) < i+2 {
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                                return -1, ""
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                        }
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                        buf[j] = httpUnquotePair(raw[i+1])
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                        eaten += 2
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                        j++
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                        i++
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                default:
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                        if isQdText(b) {
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                                buf[j] = b
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                        } else {
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                                buf[j] = '?'
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                        }
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                        eaten++
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                        j++
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                }
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        }
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        return -1, ""
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}
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// This is a best effort parse, so errors are not returned, instead not all of
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// the input string might be parsed. result is always non-nil.
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func httpSplitFieldValue(fv string) (eaten int, result []string) {
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        result = make([]string, 0, len(fv))
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        raw := []byte(fv)
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        i := 0
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        chunk := ""
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        for i < len(raw) {
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                b := raw[i]
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                switch {
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                case b == '"':
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                        eaten, unq := httpUnquote(raw[i:len(raw)])
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                        if eaten < 0 {
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                                return i, result
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                        } else {
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                                i += eaten
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                                chunk += unq
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                        }
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                case isSeparator(b):
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                        if chunk != "" {
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                                result = result[0 : len(result)+1]
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                                result[len(result)-1] = chunk
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                                chunk = ""
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                        }
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                        i++
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                case isToken(b):
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                        chunk += string(b)
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                        i++
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                case b == '\n' || b == '\r':
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                        i++
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                default:
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                        chunk += "?"
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                        i++
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                }
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        }
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        if chunk != "" {
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                result = result[0 : len(result)+1]
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                result[len(result)-1] = chunk
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                chunk = ""
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        }
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        return i, result
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}

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