如何将二进制数据附加到 node.js 中的缓冲区

我有一个包含一些二进制数据的缓冲区:

var b = new Buffer ([0x00, 0x01, 0x02]);

我想追加0x03个.

如何添加更多二进制数据？我正在文档中搜索，但对于附加数据，它必须是字符串，如果不是，则会发生错误(TypeError: Argument must be a string):

var b = new Buffer (256);
b.write ("hola");
console.log (b.toString ("utf8", 0, 4)); //hola
b.write (", adios", 4);
console.log (b.toString ("utf8", 0, 11)); //hola, adios

然后，我在这里看到的唯一解决方案是 for each 附加的二进制数据创建一个新的缓冲区，并用正确的偏移量将其复制到主缓冲区:

var b = new Buffer (4); //4 for having a nice printed buffer, but the size will be 16KB
new Buffer ([0x00, 0x01, 0x02]).copy (b);
console.log (b); //<Buffer 00 01 02 00>
new Buffer ([0x03]).copy (b, 3);
console.log (b); //<Buffer 00 01 02 03>

但这似乎有点低效，因为我必须 for each 追加实例化一个新的缓冲区.

你知道附加二进制数据的更好方法吗？

EDIT

我写了一个BufferedWriter字节的程序，它使用内部缓冲区将字节写入文件.与BufferedReader相同，但用于写作.

举个简单的例子:

//The BufferedWriter truncates the file because append == false
new BufferedWriter ("file")
    .on ("error", function (error){
        console.log (error);
    })

    //From the beginning of the file:
    .write ([0x00, 0x01, 0x02], 0, 3) //Writes 0x00, 0x01, 0x02
    .write (new Buffer ([0x03, 0x04]), 1, 1) //Writes 0x04
    .write (0x05) //Writes 0x05
    .close (); //Closes the writer. A flush is implicitly done.

//The BufferedWriter appends content to the end of the file because append == true
new BufferedWriter ("file", true)
    .on ("error", function (error){
        console.log (error);
    })

    //From the end of the file:
    .write (0xFF) //Writes 0xFF
    .close (); //Closes the writer. A flush is implicitly done.

//The file contains: 0x00, 0x01, 0x02, 0x04, 0x05, 0xFF

LAST UPDATE

使用concat.