Go のカスタム SplitFunc を使用して、特定の区切り文字 CRLF までバッファからデータを読み取る方法は?

<code class="go">// ScanCRLF splits the input data into tokens that are terminated by CRLF.
func ScanCRLF(data []byte, atEOF bool) (advance int, token []byte, err error) {
    if atEOF && len(data) == 0 {
        return 0, nil, nil
    }
    if i := bytes.Index(data, []byte{'\r', '\n'}); i >= 0 {
        return i + 2, dropCR(data[0:i]), nil
    }
    if atEOF {
        return len(data), dropCR(data), nil
    }
    return 0, nil, nil
}

// dropCR drops a terminal \r from the data.
func dropCR(data []byte) []byte {
    if len(data) > 0 && data[len(data)-1] == '\r' {
        return data[0 : len(data)-1]
    }
    return data
}</code>

<code class="go">// Wrap the reader with the custom scanner
scanner := bufio.NewScanner(this.reader)
scanner.Split(ScanCRLF)

// Read each line using the scanner
for scanner.Scan() {
    // Process the line as needed...
}

// Check for any errors encountered by the scanner
if err := scanner.Err(); err != nil {
    // Log or handle the error
}</code>

<code class="go">// Read the expected number of bytes
nr_of_bytes, err := this.reader.ReadNumberBytesSomeHow()
if err != nil {
    // Handle the error
}

// Allocate a buffer to hold the body
buf := make([]byte, nr_of_bytes)

// Read the body into the buffer
this.reader.Read(buf)

// Process the body as needed...</code>