package chardet

type recognizer interface {
	Match(*recognizerInput) recognizerOutput
}

type recognizerOutput Result

type recognizerInput struct {
	raw         []byte
	input       []byte
	tagStripped bool
	byteStats   []int
	hasC1Bytes  bool
}

func newRecognizerInput(raw []byte, stripTag bool) *recognizerInput {
	input, stripped := mayStripInput(raw, stripTag)
	byteStats := computeByteStats(input)
	return &recognizerInput{
		raw:         raw,
		input:       input,
		tagStripped: stripped,
		byteStats:   byteStats,
		hasC1Bytes:  computeHasC1Bytes(byteStats),
	}
}

func mayStripInput(raw []byte, stripTag bool) (out []byte, stripped bool) {
	const inputBufferSize = 8192
	out = make([]byte, 0, inputBufferSize)
	var badTags, openTags int32
	var inMarkup bool = false
	stripped = false
	if stripTag {
		stripped = true
		for _, c := range raw {
			if c == '<' {
				if inMarkup {
					badTags += 1
				}
				inMarkup = true
				openTags += 1
			}
			if !inMarkup {
				out = append(out, c)
				if len(out) >= inputBufferSize {
					break
				}
			}
			if c == '>' {
				inMarkup = false
			}
		}
	}
	if openTags < 5 || openTags/5 < badTags || (len(out) < 100 && len(raw) > 600) {
		limit := len(raw)
		if limit > inputBufferSize {
			limit = inputBufferSize
		}
		out = make([]byte, limit)
		copy(out, raw[:limit])
		stripped = false
	}
	return
}

func computeByteStats(input []byte) []int {
	r := make([]int, 256)
	for _, c := range input {
		r[c] += 1
	}
	return r
}

func computeHasC1Bytes(byteStats []int) bool {
	for _, count := range byteStats[0x80 : 0x9F+1] {
		if count > 0 {
			return true
		}
	}
	return false
}
<html>
<head><title>PANIC: session(release): write data/sessions/e/f/ef55aa62e8d37d4d: no space left on device</title>
<meta charset="utf-8" />
<style type="text/css">
html, body {
	font-family: "Roboto", sans-serif;
	color: #333333;
	background-color: #ea5343;
	margin: 0px;
}
h1 {
	color: #d04526;
	background-color: #ffffff;
	padding: 20px;
	border-bottom: 1px dashed #2b3848;
}
pre {
	margin: 20px;
	padding: 20px;
	border: 2px solid #2b3848;
	background-color: #ffffff;
	white-space: pre-wrap;       /* css-3 */
	white-space: -moz-pre-wrap;  /* Mozilla, since 1999 */
	white-space: -pre-wrap;      /* Opera 4-6 */
	white-space: -o-pre-wrap;    /* Opera 7 */
	word-wrap: break-word;       /* Internet Explorer 5.5+ */
}
</style>
</head><body>
<h1>PANIC</h1>
<pre style="font-weight: bold;">session(release): write data/sessions/e/f/ef55aa62e8d37d4d: no space left on device</pre>
<pre>github.com/go-macaron/session@v0.0.0-20190805070824-1a3cdc6f5659/session.go:199 (0x8b2934)
gopkg.in/macaron.v1@v1.3.9/context.go:79 (0x83d0a0)
github.com/go-macaron/inject@v0.0.0-20160627170012-d8a0b8677191/inject.go:157 (0x80ab07)
github.com/go-macaron/inject@v0.0.0-20160627170012-d8a0b8677191/inject.go:135 (0x80a8a8)
gopkg.in/macaron.v1@v1.3.9/context.go:121 (0x83d1f8)
gopkg.in/macaron.v1@v1.3.9/context.go:112 (0x84fdb5)
gopkg.in/macaron.v1@v1.3.9/recovery.go:161 (0x84fda8)
gopkg.in/macaron.v1@v1.3.9/logger.go:40 (0x840c73)
github.com/go-macaron/inject@v0.0.0-20160627170012-d8a0b8677191/inject.go:157 (0x80ab07)
github.com/go-macaron/inject@v0.0.0-20160627170012-d8a0b8677191/inject.go:135 (0x80a8a8)
gopkg.in/macaron.v1@v1.3.9/context.go:121 (0x83d1f8)
gopkg.in/macaron.v1@v1.3.9/router.go:187 (0x850fc6)
gopkg.in/macaron.v1@v1.3.9/router.go:303 (0x8493e5)
gopkg.in/macaron.v1@v1.3.9/macaron.go:220 (0x841fca)
net/http/server.go:2836 (0x7a79b2)
net/http/server.go:1924 (0x7a341b)
runtime/asm_amd64.s:1373 (0x46f9f0)
</pre>
</body>
</html>