diff --git a/build b/build
new file mode 100755
index 0000000..2e967da
--- /dev/null
+++ b/build
@@ -0,0 +1,4 @@
+#!/bin/bash
+
+browserify index.js > dist/pluie.bin.js
+uglifyjs dist/pluie.bin.js -c -m -o dist/pluie.bin.min.js
diff --git a/dist/pluie.bin.js b/dist/pluie.bin.js
new file mode 100644
index 0000000..4da708f
--- /dev/null
+++ b/dist/pluie.bin.js
@@ -0,0 +1,222 @@
+(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
+bin = require('./lib/bin');
+module.exports = bin;
+
+},{"./lib/bin":2}],2:[function(require,module,exports){
+'use strict';
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+String.prototype.removeEndNullBytes = function() {
+    return this.replace(/\0+$/g, '');
+}
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+String.prototype.removeStartNullBytes = function() {
+    return this.replace(/^\0+/g, '');
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+var bin =
+{
+    enc             : new TextEncoder("utf-8"),
+    dec             : new TextDecoder("utf-8", {fatal: true}),
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    intFromBytes    : function(bytes)
+    {
+        var value = null;
+        if (bytes!=null && bytes.length > 0) {
+            // Big Endian
+            for (var i = value = 0, lim = bytes.length; i < lim; i++) {
+                value = value * 256 + bytes[i];
+            }
+        }
+        return value;
+    },
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    bytesFromInt    : function(value, size)
+    {
+        var bytes = new Uint8Array(size);
+        while (value) {
+            bytes.set([value & 255], --size);
+            value >>= 8;
+        }
+        return bytes;
+    },
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    pack            : function(size, type, value)
+    {
+        var packed = null 
+        if (type == 'n' || type == 'N') {
+            // js int max on 32 signed bits
+            if (value >= 0 && value <= 2147483647) {
+                packed = this.bytesFromInt(value, type == 'n' ? 2 : 4);
+            }
+        }
+        else if (type == 'a') {
+            packed = new Uint8Array(size);
+            packed.set(this.enc.encode(value), 0);
+        }
+        return packed;
+    },
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    unpack          : function(size, type, bytes)
+    {
+        var unpacked = null 
+        if (type == 'n' || type == 'N') {
+            var selByte = bytes.slice(0, size*(type == 'n' ? 2 : 4));
+            unpacked = this.intFromBytes(selByte);
+        }
+        else if (type == 'a') {
+            unpacked = this.dec.decode(bytes.slice(0, size)).removeEndNullBytes();
+        }
+        return unpacked;
+    },
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    mergeBuffers    : function(bufferArray)
+    {
+        var maxLength = 0;
+        for(var i=0, lim=bufferArray.length; i < lim; i++) {
+            if (bufferArray[i] != null) {
+                maxLength += bufferArray[i].byteLength;
+            }
+        }
+        var tmp = new Uint8Array(maxLength);
+        for(var i=0, pos = 0, lim=bufferArray.length; i < lim; i++) {
+            if (bufferArray[i] != null) {
+                tmp.set(new Uint8Array(bufferArray[i]), pos);
+                pos += bufferArray[i].byteLength;
+            }
+        }
+        return tmp;
+    },
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    getBuffer       : function(array, size)
+    {
+        var buffer  = new Uint8Array(!size ? array.length : size);
+        buffer.set(new Uint8Array(array), 0);
+        return buffer;
+    },
+}
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+require('./file')(bin);
+module.exports = bin;
+
+},{"./file":3}],3:[function(require,module,exports){
+module.exports = function (bin) {
+    require('./header')(bin);
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    bin.File = function(binary, header) {
+        this.header = header;
+        this.binary = binary;
+        this.extractProperties  = function(binary) {
+            if (!binary) binary = this.binary;
+            if (binary != null && binary.length >= this.header.def.length) {
+                this.header.def.map.forEach (function(prop) {
+                    var bytes    = binary.slice(prop.offset, prop.offset+prop.length);
+                    var unpacked = bin.unpack(prop.size, prop.type, bytes);
+                    prop.value = unpacked;
+                });
+            }
+        };
+        this.buildProperties = function(properties) {
+            var data = [];
+            this.header.buildProperties(properties);
+            this.header.def.map.forEach (function(prop) {
+                var packed = bin.pack(prop.size, prop.type, prop.value);
+                data.push(packed);
+            });
+            data = bin.mergeBuffers(data);
+        };
+        this.extractProperties(binary);
+    }
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    bin.smpFile = function(binary) {
+        return new bin.File(binary, new bin.Header([
+            ['signature', 'a',  9, '∢SMP0.2'],
+            ['size'     , 'N',  1, ''],
+            ['id'       , 'N',  1, ''],
+            ['from'     , 'a', 32, ''],
+            ['to'       , 'a', 32, ''],
+            ['channel'  , 'a', 32, ''],
+            ['command'  , 'n',  1, ''],
+            ['index'    , 'n',  1, ''],
+            ['split'    , 'n',  1, '']
+        ]));
+    }
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    bin.smpsFile = function(binary) {
+        return new bin.File(binary, new bin.Header([
+            ['signature', 'a',  13, 'ﷸSMPS0.2∢'],
+            ['size'     , 'N',   1, ''],
+            ['nonce'    , 'a',  12, ''],
+            ['cypher'   , 'a', 135, '']
+        ]));
+    }
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    bin.smpaFile = function(binary) {
+        return new bin.BaseFile(binary, new bin.Header([
+            ['signature', 'a',  13, 'ﷸSMPA0.2∢'],
+            ['size'     , 'N',   1, ''],
+            ['nonce'    , 'a',  24, ''],
+            ['cypher'   , 'a', 199, '']
+        ]));
+    }
+}
+
+},{"./header":4}],4:[function(require,module,exports){
+'use strict';
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+module.exports = function (bin) {
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    var HeaderProperty = function(name, type, size, defaultValue)
+    {
+        this.name   = name;
+        this.type   = type;
+        this.size   = size;
+        this.length = type == 'N' ? size*4 : (type == 'n' ? size*2 : size );
+        this.value  = defaultValue;
+    };
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    var HeaderDef = function(mapData)
+    {
+        var map = [];
+        mapData.forEach(function (def) {
+            map.push(new HeaderProperty(def[0], def[1], def[2], def[3]));
+        });
+        this.map    = map; 
+        var keys    = [];
+        var indexes = {};
+        var offset  = 0;
+        var index   = 0;
+        this.map.forEach(function(prop) {
+            prop.offset = offset;
+            keys[keys.length] = prop.name;
+            offset += prop.length;
+            indexes[prop.name] = index++;
+        });
+        this.indexes     = indexes;
+        this.keys        = keys;
+        this.length      = offset;
+        this.getProperty = function(key) {
+            return this.map[this.indexes[key]];
+        }
+    };
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    bin.Header = function(def) {
+        this.def   = new HeaderDef(def);
+        this.value = function(key) {
+            return this.def.getProperty(key).value;
+        };
+        this.buildProperties = function(properties) {
+            this.def.map.forEach(function(prop) {
+                if (prop.name != 'signature') {
+                    if (typeof properties[prop.name] != 'undefined') {
+                        prop.value = properties[prop.name];
+                    }
+                }
+            });
+        };
+    }
+}
+
+},{}]},{},[1]);
diff --git a/dist/pluie.bin.min.js b/dist/pluie.bin.min.js
new file mode 100644
index 0000000..0c3b7a0
--- /dev/null
+++ b/dist/pluie.bin.min.js
@@ -0,0 +1 @@
+!function e(n,t,r){function i(u,o){if(!t[u]){if(!n[u]){var s="function"==typeof require&&require;if(!o&&s)return s(u,!0);if(a)return a(u,!0);var f=new Error("Cannot find module '"+u+"'");throw f.code="MODULE_NOT_FOUND",f}var c=t[u]={exports:{}};n[u][0].call(c.exports,function(e){var t=n[u][1][e];return i(t?t:e)},c,c.exports,e,n,t,r)}return t[u].exports}for(var a="function"==typeof require&&require,u=0;u<r.length;u++)i(r[u]);return i}({1:[function(e,n,t){bin=e("./lib/bin"),n.exports=bin},{"./lib/bin":2}],2:[function(e,n,t){"use strict";String.prototype.removeEndNullBytes=function(){return this.replace(/\0+$/g,"")},String.prototype.removeStartNullBytes=function(){return this.replace(/^\0+/g,"")};var r={enc:new TextEncoder("utf-8"),dec:new TextDecoder("utf-8",{fatal:!0}),intFromBytes:function(e){var n=null;if(null!=e&&e.length>0)for(var t=n=0,r=e.length;t<r;t++)n=256*n+e[t];return n},bytesFromInt:function(e,n){for(var t=new Uint8Array(n);e;)t.set([255&e],--n),e>>=8;return t},pack:function(e,n,t){var r=null;return"n"==n||"N"==n?t>=0&&t<=2147483647&&(r=this.bytesFromInt(t,"n"==n?2:4)):"a"==n&&(r=new Uint8Array(e),r.set(this.enc.encode(t),0)),r},unpack:function(e,n,t){var r=null;if("n"==n||"N"==n){var i=t.slice(0,e*("n"==n?2:4));r=this.intFromBytes(i)}else"a"==n&&(r=this.dec.decode(t.slice(0,e)).removeEndNullBytes());return r},mergeBuffers:function(e){for(var n=0,t=0,r=e.length;t<r;t++)null!=e[t]&&(n+=e[t].byteLength);for(var i=new Uint8Array(n),t=0,a=0,r=e.length;t<r;t++)null!=e[t]&&(i.set(new Uint8Array(e[t]),a),a+=e[t].byteLength);return i},getBuffer:function(e,n){var t=new Uint8Array(n?n:e.length);return t.set(new Uint8Array(e),0),t}};e("./file")(r),n.exports=r},{"./file":3}],3:[function(e,n,t){n.exports=function(n){e("./header")(n),n.File=function(e,t){this.header=t,this.binary=e,this.extractProperties=function(e){e||(e=this.binary),null!=e&&e.length>=this.header.def.length&&this.header.def.map.forEach(function(t){var r=e.slice(t.offset,t.offset+t.length),i=n.unpack(t.size,t.type,r);t.value=i})},this.buildProperties=function(e){var t=[];this.header.buildProperties(e),this.header.def.map.forEach(function(e){var r=n.pack(e.size,e.type,e.value);t.push(r)}),t=n.mergeBuffers(t)},this.extractProperties(e)},n.smpFile=function(e){return new n.File(e,new n.Header([["signature","a",9,"∢SMP0.2"],["size","N",1,""],["id","N",1,""],["from","a",32,""],["to","a",32,""],["channel","a",32,""],["command","n",1,""],["index","n",1,""],["split","n",1,""]]))},n.smpsFile=function(e){return new n.File(e,new n.Header([["signature","a",13,"ﷸSMPS0.2∢"],["size","N",1,""],["nonce","a",12,""],["cypher","a",135,""]]))},n.smpaFile=function(e){return new n.BaseFile(e,new n.Header([["signature","a",13,"ﷸSMPA0.2∢"],["size","N",1,""],["nonce","a",24,""],["cypher","a",199,""]]))}}},{"./header":4}],4:[function(e,n,t){"use strict";n.exports=function(e){var n=function(e,n,t,r){this.name=e,this.type=n,this.size=t,this.length="N"==n?4*t:"n"==n?2*t:t,this.value=r},t=function(e){var t=[];e.forEach(function(e){t.push(new n(e[0],e[1],e[2],e[3]))}),this.map=t;var r=[],i={},a=0,u=0;this.map.forEach(function(e){e.offset=a,r[r.length]=e.name,a+=e.length,i[e.name]=u++}),this.indexes=i,this.keys=r,this.length=a,this.getProperty=function(e){return this.map[this.indexes[e]]}};e.Header=function(e){this.def=new t(e),this.value=function(e){return this.def.getProperty(e).value},this.buildProperties=function(e){this.def.map.forEach(function(n){"signature"!=n.name&&"undefined"!=typeof e[n.name]&&(n.value=e[n.name])})}}}},{}]},{},[1]);
\ No newline at end of file
diff --git a/index.js b/index.js
index 8d639ca..0f36466 100644
--- a/index.js
+++ b/index.js
@@ -1,68 +1,2 @@
-'use strict';
-
-String.prototype.removeEndNullBytes = function() {
-    return this.replace(/\0+$/g, '');
-}
-String.prototype.removeStartNullBytes = function() {
-    return this.replace(/^\0+/g, '');
-}
-
-var pluie =
-{
-    bin : 
-    {
-        enc             : new TextEncoder("utf-8"),
-
-        dec             : new TextDecoder("utf-8", {fatal: true}),
-
-        intFromBytes    : function(bytes)
-        {
-            // Big Endian
-            for (var i = value = 0, lim = bytes.length; i < lim; i++) {
-                value = value * 256 + bytes[i];
-            }
-            return value;
-        },
-
-        bytesFromInt    : function(value, size)
-        {
-            var bytes = new Uint8Array(size);
-            while (value) {
-                bytes.set([value & 255], --size);
-                value >>= 8;;
-            }
-            return bytes;
-        },
-
-        pack            : function(size, type, value)
-        {
-            var packed = null 
-            if (type == 'n' || type == 'N') {
-                // js int max on 32 signed bits
-                if (value >= 0 && value <= 2147483647) {
-                    packed = this.bytesFromInt(value, type == 'n' ? 2 : 4);
-                }
-            }
-            else if (type == 'a') {
-                packed = new Uint8Array(size);
-                packed.set(this.enc.encode(value), 0);
-            }
-            return packed;
-        },
-
-        unpack          : function(size, type, bytes)
-        {
-            var unpacked = null 
-            if (type == 'n' || type == 'N') {
-                var selByte = bytes.slice(0, size*(type == 'n' ? 2 : 4));
-                unpacked = this.intFromBytes(selByte);
-            }
-            else if (type == 'a') {
-                unpacked = this.dec.decode(bytes.slice(0, size)).removeEndNullBytes();
-            }
-            return unpacked;
-        }
-    }
-}
-
-module.exports = pluie.bin;
+bin = require('./lib/bin');
+module.exports = bin;
diff --git a/lib/bin.js b/lib/bin.js
new file mode 100644
index 0000000..87f53a9
--- /dev/null
+++ b/lib/bin.js
@@ -0,0 +1,96 @@
+'use strict';
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+String.prototype.removeEndNullBytes = function() {
+    return this.replace(/\0+$/g, '');
+}
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+String.prototype.removeStartNullBytes = function() {
+    return this.replace(/^\0+/g, '');
+}
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+var bin =
+{
+    enc             : new TextEncoder("utf-8"),
+    dec             : new TextDecoder("utf-8", {fatal: true}),
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    intFromBytes    : function(bytes)
+    {
+        var value = null;
+        if (bytes!=null && bytes.length > 0) {
+            // Big Endian
+            for (var i = value = 0, lim = bytes.length; i < lim; i++) {
+                value = value * 256 + bytes[i];
+            }
+        }
+        return value;
+    },
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    bytesFromInt    : function(value, size)
+    {
+        var bytes = new Uint8Array(size);
+        while (value) {
+            bytes.set([value & 255], --size);
+            value >>= 8;
+        }
+        return bytes;
+    },
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    pack            : function(size, type, value)
+    {
+        var packed = null 
+        if (type == 'n' || type == 'N') {
+            // js int max on 32 signed bits
+            if (value >= 0 && value <= 2147483647) {
+                packed = this.bytesFromInt(value, type == 'n' ? 2 : 4);
+            }
+        }
+        else if (type == 'a') {
+            packed = new Uint8Array(size);
+            packed.set(this.enc.encode(value), 0);
+        }
+        return packed;
+    },
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    unpack          : function(size, type, bytes)
+    {
+        var unpacked = null 
+        if (type == 'n' || type == 'N') {
+            var selByte = bytes.slice(0, size*(type == 'n' ? 2 : 4));
+            unpacked = this.intFromBytes(selByte);
+        }
+        else if (type == 'a') {
+            unpacked = this.dec.decode(bytes.slice(0, size)).removeEndNullBytes();
+        }
+        return unpacked;
+    },
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    mergeBuffers    : function(bufferArray)
+    {
+        var maxLength = 0;
+        for(var i=0, lim=bufferArray.length; i < lim; i++) {
+            if (bufferArray[i] != null) {
+                maxLength += bufferArray[i].byteLength;
+            }
+        }
+        var tmp = new Uint8Array(maxLength);
+        for(var i=0, pos = 0, lim=bufferArray.length; i < lim; i++) {
+            if (bufferArray[i] != null) {
+                tmp.set(new Uint8Array(bufferArray[i]), pos);
+                pos += bufferArray[i].byteLength;
+            }
+        }
+        return tmp;
+    },
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    getBuffer       : function(array, size)
+    {
+        var buffer  = new Uint8Array(!size ? array.length : size);
+        buffer.set(new Uint8Array(array), 0);
+        return buffer;
+    },
+}
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+require('./file')(bin);
+module.exports = bin;
diff --git a/lib/file.js b/lib/file.js
new file mode 100644
index 0000000..6607c4f
--- /dev/null
+++ b/lib/file.js
@@ -0,0 +1,60 @@
+module.exports = function (bin) {
+    require('./header')(bin);
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    bin.File = function(binary, header) {
+        this.header = header;
+        this.binary = binary;
+        this.extractProperties  = function(binary) {
+            if (!binary) binary = this.binary;
+            if (binary != null && binary.length >= this.header.def.length) {
+                this.header.def.map.forEach (function(prop) {
+                    var bytes    = binary.slice(prop.offset, prop.offset+prop.length);
+                    var unpacked = bin.unpack(prop.size, prop.type, bytes);
+                    prop.value = unpacked;
+                });
+            }
+        };
+        this.buildProperties = function(properties) {
+            var data = [];
+            this.header.buildProperties(properties);
+            this.header.def.map.forEach (function(prop) {
+                var packed = bin.pack(prop.size, prop.type, prop.value);
+                data.push(packed);
+            });
+            data = bin.mergeBuffers(data);
+        };
+        this.extractProperties(binary);
+    }
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    bin.smpFile = function(binary) {
+        return new bin.File(binary, new bin.Header([
+            ['signature', 'a',  9, '∢SMP0.2'],
+            ['size'     , 'N',  1, ''],
+            ['id'       , 'N',  1, ''],
+            ['from'     , 'a', 32, ''],
+            ['to'       , 'a', 32, ''],
+            ['channel'  , 'a', 32, ''],
+            ['command'  , 'n',  1, ''],
+            ['index'    , 'n',  1, ''],
+            ['split'    , 'n',  1, '']
+        ]));
+    }
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    bin.smpsFile = function(binary) {
+        return new bin.File(binary, new bin.Header([
+            ['signature', 'a',  13, 'ﷸSMPS0.2∢'],
+            ['size'     , 'N',   1, ''],
+            ['nonce'    , 'a',  12, ''],
+            ['cypher'   , 'a', 135, '']
+        ]));
+    }
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    bin.smpaFile = function(binary) {
+        return new bin.BaseFile(binary, new bin.Header([
+            ['signature', 'a',  13, 'ﷸSMPA0.2∢'],
+            ['size'     , 'N',   1, ''],
+            ['nonce'    , 'a',  24, ''],
+            ['cypher'   , 'a', 199, '']
+        ]));
+    }
+}
diff --git a/lib/header.js b/lib/header.js
new file mode 100644
index 0000000..355b4ae
--- /dev/null
+++ b/lib/header.js
@@ -0,0 +1,55 @@
+'use strict';
+
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+module.exports = function (bin) {
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    var HeaderProperty = function(name, type, size, defaultValue)
+    {
+        this.name   = name;
+        this.type   = type;
+        this.size   = size;
+        this.length = type == 'N' ? size*4 : (type == 'n' ? size*2 : size );
+        this.value  = defaultValue;
+    };
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    var HeaderDef = function(mapData)
+    {
+        var map = [];
+        mapData.forEach(function (def) {
+            map.push(new HeaderProperty(def[0], def[1], def[2], def[3]));
+        });
+        this.map    = map; 
+        var keys    = [];
+        var indexes = {};
+        var offset  = 0;
+        var index   = 0;
+        this.map.forEach(function(prop) {
+            prop.offset = offset;
+            keys[keys.length] = prop.name;
+            offset += prop.length;
+            indexes[prop.name] = index++;
+        });
+        this.indexes     = indexes;
+        this.keys        = keys;
+        this.length      = offset;
+        this.getProperty = function(key) {
+            return this.map[this.indexes[key]];
+        }
+    };
+    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    bin.Header = function(def) {
+        this.def   = new HeaderDef(def);
+        this.value = function(key) {
+            return this.def.getProperty(key).value;
+        };
+        this.buildProperties = function(properties) {
+            this.def.map.forEach(function(prop) {
+                if (prop.name != 'signature') {
+                    if (typeof properties[prop.name] != 'undefined') {
+                        prop.value = properties[prop.name];
+                    }
+                }
+            });
+        };
+    }
+}
diff --git a/package.json b/package.json
index 35e5041..0cb9c72 100644
--- a/package.json
+++ b/package.json
@@ -12,5 +12,7 @@
   "repository": {
     "type": "git",
     "url": "https://git.pluie.org/pluie/js-bin.git"
+  },
+  "dependencies": {
   }
 }