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soypat
41 lines
1.3 KiB
Go
41 lines
1.3 KiB
Go
package internal
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import (
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"encoding/hex"
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"strconv"
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)
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// AppendStrDecimal appends pfx followed by value in base 10 to dst and returns
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// the resulting slice. It condenses the prefixed-number pattern common to
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// AppendString/AppendText methods, i.e. `internal.AppendStrDecimal(b, " len=", 4)`.
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func AppendStrDecimal(dst []byte, pfx string, value int64) []byte {
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dst = append(dst, pfx...)
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return strconv.AppendInt(dst, value, 10)
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}
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// AppendStrHexData appends pfx followed by data as hexadecimaldata.
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//
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// dst = internal.AppendStrHexData(dst, "data=0x", data...) // data=0xdeadbeef
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func AppendStrHexData(dst []byte, pfx string, data ...byte) []byte {
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dst = append(dst, pfx...)
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return hex.AppendEncode(dst, data)
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}
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// IntLen returns the number of bytes [strconv.AppendInt] emits for value in the
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// given base, including a leading minus sign for negatives. Lets callers size a
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// buffer, or test whether a value fits an existing slot, before writing a byte.
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// base must be in the range 2..36, as accepted by [strconv.AppendInt].
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func IntLen(value int64, base int) int {
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n := 1
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u := uint64(value)
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if value < 0 {
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n++ // Leading minus sign.
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u = -u // Two's-complement magnitude; correct even for math.MinInt64.
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}
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for u >= uint64(base) {
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u /= uint64(base)
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n++
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}
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return n
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}
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