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