JavaScript Perl包

Question

首先，我會告訴你 我不會說英文，但我想嘗試獲取如何在Javascript中實現Perl包來製作node.js模塊的信息。

爲此，我想獲得更多關於Perl包的信息。特別是，我特別想知道的信息是「C，H *，N」。另外，如果我可以獲得更多關於jspack的信息，那將是美好的。

預先感謝您。

日本語(Japan)

Answer 1

pack 'C'

，pack 'N'和pack 'H*'用於創建一個字節序列。

my $bytes = pack('C', $uint8); 

# Array of bytes 
var bytes = []; 
bytes.push(uint8); 

# String of bytes 
var bytes = ""; 
bytes += String.fromCharCode(uint8); 

my $bytes = pack('N', $uint32); 

# Array of bytes 
var bytes = []; 
bytes.push((uint32 >> 24) & 0xFF); 
bytes.push((uint32 >> 16) & 0xFF); 
bytes.push((uint32 >> 8) & 0xFF); 
bytes.push((uint32  ) & 0xFF); 

# String of bytes 
var bytes = ""; 
bytes += String.fromCharCode((uint32 >> 24) & 0xFF); 
bytes += String.fromCharCode((uint32 >> 16) & 0xFF); 
bytes += String.fromCharCode((uint32 >> 8) & 0xFF); 
bytes += String.fromCharCode((uint32  ) & 0xFF); 

my $bytes = pack('H*', $hex_str); 

# Array of bytes 
function hexToBytes(hex) { 
    var bytes = []; 
    for (var c = 0; c < hex.length; c += 2) 
     bytes.push(parseInt(hex.substr(c, 2), 16)); 

    return bytes; 
} 

# String of bytes 
function hexToBytes(hex) { 
    var bytes = ""; 
    for (var c = 0; c < hex.length; c += 2) 
     bytes += String.fromCharCode(parseInt(hex.substr(c, 2), 16)); 

    return bytes; 
}