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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [net/] [http/] [sniff.go] - Blame information for rev 796

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Line No. Rev Author Line
1 747 jeremybenn 
// Copyright 2011 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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import (
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        "bytes"
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        "encoding/binary"
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)
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// Content-type sniffing algorithm.
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// References in this file refer to this draft specification:
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//   http://mimesniff.spec.whatwg.org/
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// The algorithm prefers to use sniffLen bytes to make its decision.
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const sniffLen = 512
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// DetectContentType returns the sniffed Content-Type string
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// for the given data. This function always returns a valid MIME type.
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func DetectContentType(data []byte) string {
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        if len(data) > sniffLen {
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                data = data[:sniffLen]
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        }
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        // Index of the first non-whitespace byte in data.
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        firstNonWS := 0
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        for ; firstNonWS < len(data) && isWS(data[firstNonWS]); firstNonWS++ {
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        }
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        for _, sig := range sniffSignatures {
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                if ct := sig.match(data, firstNonWS); ct != "" {
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                        return ct
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                }
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        }
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        return "application/octet-stream" // fallback
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}
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func isWS(b byte) bool {
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        return bytes.IndexByte([]byte("\t\n\x0C\r "), b) != -1
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}
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type sniffSig interface {
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        // match returns the MIME type of the data, or "" if unknown.
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        match(data []byte, firstNonWS int) string
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}
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// Data matching the table in section 6.
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var sniffSignatures = []sniffSig{
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        htmlSig("
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        htmlSig("
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        htmlSig("
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        htmlSig("
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        htmlSig("
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        htmlSig("
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        htmlSig("
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        htmlSig("
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        htmlSig("
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        htmlSig("
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        htmlSig("
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        htmlSig("
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        htmlSig("
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        htmlSig("
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        htmlSig("
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        htmlSig("
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        htmlSig("