<p>I need to read a byte at the position X of length Y.</p>
<p>To do this in Node.js, I'm using the Buffer class and the readUIntLE function. For example: readUIntLE(position, 3).</p>
<p>What is the equivalent of the above mentioned process in Golang if the input is a byte array?</p>
<p>The readUIntLE function reads X bytes at position Y in the buffer and converts those bytes to an unsigned 24-bit integer (little endian).</p>
<p>Thanks!</p>
<hr/>**评论：**<br/><br/>Ainar-G: <pre><p><a href="http://golang.org/pkg/encoding/binary/">http://golang.org/pkg/encoding/binary/</a> might be what you're looking for.</p></pre>pdq: <pre><p>Yep.</p>
<p>Here's an example I wrote using BigEndian and LittleEndian:</p>
<p><a href="http://play.golang.org/p/1pdEjpKo-H" rel="nofollow">http://play.golang.org/p/1pdEjpKo-H</a></p>
<p>OP can tweak it for your 24-bit case -- use Uint32() and then shift right 8 bits.</p></pre>win32re: <pre><p>Thanks, this is the final code. s.Pos is the reading position and s.Data is the byte slice I'm reading from.</p>
<pre><code>func (s *Stream) ReadUIntLE(count int) uint64 {
var n uint64
buff := s.Data[s.Pos : s.Pos + count]
s.Pos += 3
for i, b := range buff {
n += uint64(b) << uint(8 * i)
}
return n
}
func ByteSwap(value uint64) uint32 {
buf := make([]byte, 8)
binary.LittleEndian.PutUint64(buf, value)
return binary.BigEndian.Uint32(buf) >> 8
}
</code></pre></pre>
