javascript - 如何处理nodejs缓冲区(长度不确定)

Question

这是示例数据流(在缓冲区中)。 0x81是每个 block 的结束，需要处理逻辑直到下一个0x81。

00:15:04:00:00:30:04:54:52:55:45:05:14:00:00:00:04:4b:30:01:00:64:81:00:14:04:00:00:10:03:42:57:47:03:0c:00:14:00:04:4b:31:01:01:f4:81:00:1a:04:00:00:14:07:44:43:4f:4e:2d:57:32:00:80:00:03:00:04:4b:33:02:07:08:20:08:81:00:15:04:00:00:20:04:49:52:50:43:01:ba:00:00:00:04:4b:34:01:00:64:81:00:15:04:00:00:00:04:42:44:4d:53:07:e4:00:1e:00:04:4b:35:01:03:20:81

我需要处理完整的流，但不知道如何处理每个 block 的不确定长度。

Answer 1

您可以尝试使用以下内容:

var bytes = "00:15:04:00:00:81:00:01:81:51:81".split(":");
var buffer = new Buffer(bytes);

function getNextBlock(buffer, pos) {
    if (pos >= buffer.length)
        return false;

    var block = [];
    while (pos < buffer.length && buffer[pos] != "81")
        block.push(buffer[pos++]);

    return block.length ? block : false;

}

var block;
var pos = 0;
while(block = getNextBlock(buffer, pos)) {
    console.log(block);
    pos += 1 + block.length;
}