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// Copyright (C) 2023 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
// Package jsonutil provides utilities for implementing the interfaces
// consumed by the "git.lukeshu.com/go/lowmemjson" package.
package jsonutil
import (
"io"
"git.lukeshu.com/go/lowmemjson"
)
func EncodeHexString[T ~[]byte | ~string](w io.Writer, str T) error {
const hextable = "0123456789abcdef"
var buf [2]byte
buf[0] = '"'
if _, err := w.Write(buf[:1]); err != nil {
return err
}
for i := 0; i < len(str); i++ {
buf[0] = hextable[str[i]>>4]
buf[1] = hextable[str[i]&0x0f]
if _, err := w.Write(buf[:]); err != nil {
return err
}
}
buf[0] = '"'
if _, err := w.Write(buf[:1]); err != nil {
return err
}
return nil
}
func DecodeHexString(r io.RuneScanner, dst io.ByteWriter) error {
dec := &hexDecoder{dst: dst}
if err := lowmemjson.DecodeString(r, dec); err != nil {
return err
}
return dec.Close()
}
func EncodeSplitHexString[T ~[]byte | ~string](w io.Writer, str T, maxStrLen int) error {
if maxStrLen <= 0 || len(str) <= maxStrLen/2 {
return EncodeHexString(w, str)
}
var buf [1]byte
buf[0] = '['
if _, err := w.Write(buf[:]); err != nil {
return err
}
for len(str) > maxStrLen/2 {
if err := EncodeHexString(w, str[:maxStrLen/2]); err != nil {
return err
}
str = str[maxStrLen/2:]
if len(str) > 0 {
buf[0] = ','
if _, err := w.Write(buf[:]); err != nil {
return err
}
}
}
if len(str) > 0 {
if err := EncodeHexString(w, str); err != nil {
return err
}
}
buf[0] = ']'
if _, err := w.Write(buf[:]); err != nil {
return err
}
return nil
}
func DecodeSplitHexString(r io.RuneScanner, dst io.ByteWriter) error {
c, _, _ := r.ReadRune()
_ = r.UnreadRune()
if c == '"' {
return DecodeHexString(r, dst)
}
return lowmemjson.DecodeArray(r, func(r io.RuneScanner) error {
return DecodeHexString(r, dst)
})
}
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