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https://github.com/MHSanaei/3x-ui.git
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25 lines
729 B
Go
25 lines
729 B
Go
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package utils
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import (
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"math/rand/v2"
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)
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var (
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// 8 ÷ (397/62)
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h2packCorrectionFactor = 1.2493702770780857
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base62TotalCharsNum = 62
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base62Chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
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)
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// H2Base62Pad generates a base62 padding string for HTTP/2 header
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// The total len will be slightly longer than the input to match the length after h2(h3 also) header huffman encoding
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func H2Base62Pad[T int32 | int64 | int](expectedLen T) string {
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actualLenFloat := float64(expectedLen) * h2packCorrectionFactor
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actualLen := int(actualLenFloat)
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result := make([]byte, actualLen)
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for i := range actualLen {
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result[i] = base62Chars[rand.N(base62TotalCharsNum)]
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}
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return string(result)
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}
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