76 lines
1.8 KiB
JavaScript
76 lines
1.8 KiB
JavaScript
|
// unpack for static buffer
|
||
|
|
|
||
|
|
// TODO: use as fallback only if v0.5+ fuffer is not available
|
||
|
|
// TODO: remove duplicate code
|
||
|
|
var argument_length = {};
|
||
|
|
argument_length.C = 1;
|
||
|
|
argument_length.S = 2;
|
||
|
|
argument_length.s = 2;
|
||
|
|
argument_length.L = 4;
|
||
|
|
argument_length.x = 1;
|
||
|
|
|
||
|
|
module.exports.addUnpack = function(Buffer)
|
||
|
|
{
|
||
|
|
Buffer.prototype.unpack = function(format, offset)
|
||
|
|
{
|
||
|
|
if (!offset)
|
||
|
|
offset = 0;
|
||
|
|
|
||
|
|
var data = [];
|
||
|
|
var current_arg = 0;
|
||
|
|
while (current_arg < format.length)
|
||
|
|
{
|
||
|
|
var arg = format[current_arg];
|
||
|
|
switch (arg) {
|
||
|
|
case 'C':
|
||
|
|
data.push(this.readUInt8(offset++));
|
||
|
|
break;
|
||
|
|
case 'c':
|
||
|
|
data.push(this.readInt8(offset++));
|
||
|
|
break;
|
||
|
|
case 'S':
|
||
|
|
data.push(this.readUInt16LE(offset));
|
||
|
|
offset += 2;
|
||
|
|
break;
|
||
|
|
case 's':
|
||
|
|
data.push(this.readInt16LE(offset));
|
||
|
|
offset += 2;
|
||
|
|
break;
|
||
|
|
case 'n':
|
||
|
|
data.push(this.readUInt16BE(offset));
|
||
|
|
offset += 2;
|
||
|
|
break;
|
||
|
|
case 'L':
|
||
|
|
data.push(this.readUInt32LE(offset));
|
||
|
|
offset += 4;
|
||
|
|
break;
|
||
|
|
case 'l':
|
||
|
|
data.push(this.readInt32LE(offset));
|
||
|
|
offset += 4;
|
||
|
|
break;
|
||
|
|
case 'x':
|
||
|
|
offset++;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
current_arg++;
|
||
|
|
}
|
||
|
|
return data;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
Buffer.prototype.skip = function(n)
|
||
|
|
{
|
||
|
|
offset += n;
|
||
|
|
}
|
||
|
|
*/
|
||
|
|
|
||
|
|
Buffer.prototype.unpackString = function(n, offset)
|
||
|
|
{
|
||
|
|
var res = '';
|
||
|
|
var end = offset + n;
|
||
|
|
while(offset < end)
|
||
|
|
res += String.fromCharCode(this[offset++]);
|
||
|
|
return res;
|
||
|
|
}
|
||
|
|
}
|