comparison resources/osc/node_modules/binpack/index.js @ 271:fb9c28a4676b prerelease

Added osc example project and node script for testing

+// t is a binpack typename
+var sizeOfType = function(t) {
+    // unsigned are the same length as signed
+    if(t[0] === 'U') {
+        t = t.slice(1);
+    }
+
+    return {
+        'Float32' : 4,
+        'Float64' : 8,
+        'Int8' : 1,
+        'Int16' : 2,
+        'Int32' : 4,
+        'Int64' : 8
+    }[t];
+};
+
+var endianConv = function(e, t) {
+    // node doesn't define 8 bit endianness
+    if(t[t.length - 1] === '8')
+        return '';
+
+    if(e === 'big') {
+        return 'BE';
+    }
+    return 'LE';
+};
+
+var addBindings = function(binpackTypename, nodeTypename){
+    if(!(typeof nodeTypename !== "undefined" && nodeTypename !== null)) {
+        nodeTypename = binpackTypename;
+    }
+    module.exports['pack' + binpackTypename] = function(num, endian){
+        b = new Buffer(sizeOfType(binpackTypename));
+        b['write' + nodeTypename + endianConv(endian, binpackTypename)](num, 0, true);
+        return b;
+    }
+
+    module.exports['unpack' + binpackTypename] = function(buff, endian){
+        return buff['read' + nodeTypename + endianConv(endian, binpackTypename)](0);
+    }
+}
+
+var addIntBindings = function(n) {
+    addBindings("Int" + n);
+    addBindings("UInt" + n);
+}
+
+addIntBindings(8);
+addIntBindings(16);
+addIntBindings(32);
+
+twoToThe32 = Math.pow(2, 32);
+
+// 64 bit bindings require special care
+var read64 = function(unsigned){return function(buff, endian){
+    var e = endianConv(endian, '');
+    var u = unsigned ? 'U' : '';
+    var low, high;
+    if(e === 'LE') {
+        low = buff.readUInt32LE(0);
+        high = buff['read' + u + 'Int32LE'](4);
+    } else {
+        low = buff.readUInt32BE(4);
+        high = buff['read' + u + 'Int32BE'](0);
+    }
+    return high * twoToThe32 + low;
+};};
+
+var write64 = function(unsigned){return function(num, endian){
+    var e = endianConv(endian, '');
+    var u = unsigned ? 'U' : '';
+    var b = new Buffer(8);
+    var high = Math.floor(num / twoToThe32);
+    var low = Math.floor(num - high * twoToThe32);
+    if(e == 'LE') {
+        b.writeUInt32LE(low, 0, true);
+        b['write' + u + 'Int32LE'](high, 4, true);
+    } else {
+        b.writeUInt32BE(low, 4, true);
+        b['write' + u + 'Int32BE'](high, 0, true);
+    }
+    return b;
+};};
+
+module.exports.unpackInt64 = read64(false);
+module.exports.unpackUInt64 = read64(true);
+module.exports.packInt64 = write64(false);
+module.exports.packUInt64 = write64(true);
+
+addBindings("Float32", "Float");
+addBindings("Float64", "Double");