JavaScript:读取8个字节到64位整数 [英] JavaScript: Read 8 bytes to 64 bit integer
问题描述
我有一个包含8个字节的缓冲区对象。这八个字节现在应解释为64位整数。
I have a buffer object which contains eight bytes. These eight bytes should now be interpreted as 64 bit integer.
目前我使用以下算法:
var int = buff[0];
for (var i = 1; i < buff.length; i++) {
int += (buff[i] * Math.pow(2, 8 * i));
}
console.log(int);
这有效,但我相信有更好的方法(可能使用Uint64Array)。
this works but I believe there are better ways (maybe using Uint64Array).
很遗憾我找不到Uint16Array如何帮助我。
Unfortunately I cannot find how a Uint16Array could help me here for.
问候
更新:
// puts two 32bit integers to one 64bit integer
var bufInt = (buf.readUInt32BE(0) << 8) + buf.readUInt32BE(4);
推荐答案
Javascript不支持64位整数,因为本机数字类型是64位双精度,只给出53位整数范围。
Javascript does not support 64 bit integers, because the native number type is a 64-bit double, giving only 53 bits of integer range.
您可以创建32位数字的数组(即 Uint32Array
)但如果有64位版本的那些,则无法将值复制到独立变量中。
You can create arrays of 32-bit numbers (i.e. Uint32Array
) but if there were a 64-bit version of those there'd be no way to copy values from it into standalone variables.
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