golang处理C#中使用BinaryWriter/BinaryReader序列化的字符串

CSharpBinaryString.go

package Utils

import (
	"errors"
	"io"
	"math"
)

func WriteCSharpString(writer io.Writer, value string) error {
	buffer := []byte(value)
	err := Write7BitEncodedInt(writer, int32(len(buffer)))
	if nil != err {
		return err
	}
	_, err = writer.Write(buffer)
	if nil != err {
		return err
	}
	return nil
}

func Write7BitEncodedInt(writer io.Writer, value int32) error {
	var num uint32
	for num = uint32(value); num >= 128; num >>= 7 {
		_, err := writer.Write([]byte{byte(num | 128)})
		if nil != err {
			return err
		}
	}
	_, err := writer.Write([]byte{byte(num)})
	if nil != err {
		return err
	}
	return nil
}

func ReadCSharpString(reader io.Reader) (string, error) {
	length, err := Read7BitEncodedInt(reader)
	if nil != err {
		return "", err
	}
	buffer := make([]byte, length)
	n, err := reader.Read(buffer)
	if nil != err {
		return "", err
	}
	if n != int(length) {
		return "", errors.New("length is not correct")
	}
	return string(buffer), nil
}

func Read7BitEncodedInt(reader io.Reader) (int32, error) {
	var num1 int32
	var num2 int32
	var buffer [1]byte
	for num2 != 35 {
		_, err := reader.Read(buffer[:])
		if nil != err {
			return 0, err
		}
		num3 := buffer[0]
		num1 |= (int32(num3) & int32(math.MaxInt8)) << num2
		num2 += 7
		if (int32(num3) & 128) == 0 {
			return num1, nil
		}
	}
	return 0, errors.New("Too many bytes in what should have been a 7 bit encoded Int32.")
}