first commit - decode works

Author: Mark Schmale

bencode.js

@@ -0,0 +1,93 @@
+var sys = require('sys');
+
+exports.decode = function decode(str) {
+    var arr = str.split('');
+
+    function integer(start) {
+        var c = '', n = '', i = 0, mul = 1;
+        var len = arr.length;
+        if(arr[start] === '-') {
+            mul = -1;
+            start = start+1;
+        }
+        for(i=start;i<len;i++) {
+            c = arr[i];
+            if(c == parseInt(c)) {
+                n = n  + c;
+            } else {
+                break;
+            }
+        } 
+        return {next: i+1, ret: mul*parseInt(n)};
+    }
+    
+    function text(start) {
+        var   nfo = integer(start), 
+            start = nfo.next,
+              len = nfo.ret
+                i = 0
+             full = '';
+
+        for(i=start;i<len+start;i++) {
+            full = full + arr[i]
+        }
+        return {next: i, ret: full};
+    }
+
+    function list(start) {
+        var len  = arr.length, 
+            i    = start+1,
+            list = [], 
+            tmp  = {}, 
+            lcnt = 0;
+        while(i<len && arr[i] !== 'e') {
+            tmp        = next(i);
+            i          = tmp.next;
+            list[lcnt] = tmp.ret;
+            lcnt++;
+        }
+        return {next: i+1, ret: list};
+    }
+
+    function dictionary(start) {
+        var len   = arr.length, 
+            i     = start+1,
+            list  = {}, 
+            tmp   = {}, 
+            isKey = true,
+            key   = '';
+        while(i<len && arr[i] !== 'e') {
+            tmp        = next(i);
+            i          = tmp.next;
+            if(isKey === true) {
+                key = tmp.ret;
+            } else {
+                list[key] = tmp.ret;
+            }
+            isKey = !isKey;
+        }
+        return {next: i+1, ret: list};
+    }
+
+
+    function next(start) {
+        var data = 0;
+        start = start || 0;
+        switch(arr[start]) { 
+            case 'i':   // integer
+                data = integer(start+1);
+                break;
+            case 'l':   // liste
+                data = list(start);
+                break;
+            case 'd':   // dict
+                data = dictionary(start);
+                break; 
+            default:    // string
+                data = text(start);
+        }
+        return data;
+    }
+
+    return next(0);
+}

package.json

@@ -0,0 +1,8 @@
+{   "name": "bencode", 
+    "description": "a bencode de/encoder", 
+    "version": "0.0.1", 
+    "author": "Mark Schmale <[email protected]", 
+    "directories": { "/": "./" }, 
+    "main": "./bencode", 
+    "engines": { "node": ">=0.1.94" } 
+ }