Golang io/ioutil包源码分析

最新推荐文章于 2024-05-07 20:11:56 发布

思维的深度

最新推荐文章于 2024-05-07 20:11:56 发布

阅读量487

点赞数

CC 4.0 BY-SA版权

分类专栏： Golang源码文章标签： ioutil包源码 io/ioutil包

本文链接：https://blog.youkuaiyun.com/skh2015java/article/details/107883482

io/ioutil包

Golang JDK 1.10.3

/ readAll reads from r until an error or EOF and returns the data it read
// from the internal buffer allocated with a specified capacity.
func readAll(r io.Reader, capacity int64) (b []byte, err error) {
   var buf bytes.Buffer
   // If the buffer overflows, we will get bytes.ErrTooLarge.
   // Return that as an error. Any other panic remains.
   defer func() {
      e := recover()
      if e == nil {
         return
      }
      if panicErr, ok := e.(error); ok && panicErr == bytes.ErrTooLarge {
         err = panicErr
      } else {
         panic(e)
      }
   }()
   if int64(int(capacity)) == capacity {
      buf.Grow(int(capacity))
   }
   _, err = buf.ReadFrom(r)
   return buf.Bytes(), err
}

readAll方法从io.Reader r中读取数据直到error或EOF（读完），并返回读到的数据
参数capacity 用于