hook java.io.InputStream, + Performance Tweak

README.md

@@ -19,6 +19,7 @@
  - [Webview URLS](#webview-urls)
  - [Await for specific module to load](#await-for-condition)
  - [Android make Toast](#android-make-toast)
+ - [Hook java io InputStream](#hook-java-io-inputstream)
  - [TODO list](#todos)
 
 #### Intercept and backtrace low level open
@@ -421,6 +422,45 @@ Java.scheduleOnMainThread(function() {
 });
 ```
 
+#### Hook java io InputStream
+```
+function binaryToHexToAscii(array, readLimit) {
+    var result = [];
+    // read 100 bytes #performance
+    readLimit = readLimit || 100;
+    for (var i = 0; i < readLimit; ++i) {
+        result.push(String.fromCharCode( // hex2ascii part
+            parseInt(
+                ('0' + (array[i] & 0xFF).toString(16)).slice(-2), // binary2hex part
+                16
+            )
+        ));
+    }
+    return result.join('');
+}
+
+function hookInputStream() {
+    Java.use('java.io.InputStream')['read'].overload('[B').implementation = function(b) {
+        // execute original and save return value
+        var retval = this.read(b);
+        var resp = binaryToHexToAscii(b);
+        // conditions to not print garbage packets
+        var reExcludeList = new RegExp(['Mmm'/*, 'Ping' /*, ' Yo'*/].join('|'));
+        if ( ! reExcludeList.test(resp) ) {
+            console.log(resp);
+        }
+        var reIncludeList = new RegExp(['AAA', 'BBB', 'CCC].join('|')); 
+        if ( reIncludeList.test(resp) ) {
+            send( binaryToHexToAscii(b, 1200) );
+        }
+        return retval;
+    };
+}
+
+// Main
+Java.perform(hookInputStream);
+```
+
 #### TODOs 
 - Add GIFs & docs
 - Add links to /scripts