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每字节读取一个nodejs缓冲区字节

node.js

-1

Dimitrios Desyllas · 技术社区 · 7 年前

假设我有以下缓冲区:

const buf1 = Buffer.from('12ADFF1345', 'hex');

1 回复 | 直到 7 年前

1

0

Dimitrios Desyllas 7 年前

您可以使用以下方法:

const readBufferBytes = (buffer, callback, index=0) => {
  if(!Buffer.isBuffer(buffer)) return callback(new Error('Invalid value for buffer has been provided'));
  if (typeof callback !== 'function') return callback(new Error('The callback is not a function'));
  try {
    callback(null, buffer.readUInt8(index));
    // We iterate the buffer as an array that each array posision is a byte length.
    return readBufferBytes(buffer,callback,index+1);
  } catch(e) {
     return callback(e);
  }
}

const readBufferBytes = (buffer, callback, index=0) => {
  if(!Buffer.isBuffer(buffer)) return callback(new Error('Invalid value for buffer has been provided'));
  if (typeof callback !== 'function') return callback(new Error('The callback is not a function'));

  try {
    return process.nextTick(()=>{
        callback(null, buffer.readUInt8(index));
        readBufferBytes(buffer,callback,index+1);
    });
  } catch(e) {
     return process.nextTick(()=>{callback(e);});
  }

}

关于这些函数必须注意的一点是,我将缓冲区作为数组进行迭代,每个位置包含1个字节。因此,索引传入 readUInt8 0 并且在每次迭代中增加1。