1 files changed, 12 insertions, 6 deletions
diff --git a/src/preamble.js b/src/preamble.js
index 33da1159..c88a4671 100644
--- a/src/preamble.js
+++ b/src/preamble.js
@@ -729,11 +729,14 @@ Module['Array_copy'] = Array_copy;
 #if USE_TYPED_ARRAYS
 // Copies a list of num items on the HEAP into a
 // JavaScript typed array.
-function TypedArray_copy(ptr, num) {
+function TypedArray_copy(ptr, num, offset /*optional*/) {
   // TODO: optimize this!
-  var arr = new Uint8Array(num);
-  for (var i = 0; i < num; ++i) {
-    arr[i] = {{{ makeGetValue('ptr', 'i', 'i8') }}};
+  if (offset === undefined) {
+    offset = 0;
+  }
+  var arr = new Uint8Array(num - offset);
+  for (var i = offset; i < num; ++i) {
+    arr[i - offset] = {{{ makeGetValue('ptr', 'i', 'i8') }}};
   }
   return arr.buffer;
 }
@@ -762,11 +765,14 @@ Module['String_copy'] = String_copy;
 
 // This processes a JS string into a C-line array of numbers, 0-terminated.
 // For LLVM-originating strings, see parser.js:parseLLVMString function
-function intArrayFromString(stringy, dontAddNull) {
+function intArrayFromString(stringy, dontAddNull, length /* optional */) {
   var ret = [];
   var t;
   var i = 0;
-  while (i < stringy.length) {
+  if (length === undefined) {
+    length = stringy.length;
+  }
+  while (i < length) {
     var chr = stringy.charCodeAt(i);
     if (chr > 0xFF) {
 #if ASSERTIONS