fs: extract out validateOffsetLengthRead function

PR-URL: nodejs#17682
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Anatoli Papirovski <[email protected]>
Reviewed-By: Joyee Cheung <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>

lib/fs.js

@@ -165,6 +165,21 @@ function validateFd(fd) {
   }
 }
 
+function validateOffsetLengthRead(offset, length, bufferLength) {
+  let err;
+
+  if (offset < 0 || offset >= bufferLength) {
+    err = new errors.RangeError('ERR_OUT_OF_RANGE', 'offset');
+  } else if (length < 0 || offset + length > bufferLength) {
+    err = new errors.RangeError('ERR_OUT_OF_RANGE', 'length');
+  }
+
+  if (err !== undefined) {
+    Error.captureStackTrace(err, validateOffsetLengthRead);
+    throw err;
+  }
+}
+
 // Special case of `makeCallback()` that is specific to async `*stat()` calls as
 // an optimization, since the data passed back to the callback needs to be
 // transformed anyway.
@@ -743,11 +758,7 @@ fs.read = function(fd, buffer, offset, length, position, callback) {
     });
   }
 
-  if (offset < 0 || offset >= buffer.length)
-    throw new errors.RangeError('ERR_OUT_OF_RANGE', 'offset');
-
-  if (length < 0 || offset + length > buffer.length)
-    throw new errors.RangeError('ERR_OUT_OF_RANGE', 'length');
+  validateOffsetLengthRead(offset, length, buffer.length);
 
   if (!isUint32(position))
     position = -1;
@@ -779,11 +790,7 @@ fs.readSync = function(fd, buffer, offset, length, position) {
     return 0;
   }
 
-  if (offset < 0 || offset >= buffer.length)
-    throw new errors.RangeError('ERR_OUT_OF_RANGE', 'offset');
-
-  if (length < 0 || offset + length > buffer.length)
-    throw new errors.RangeError('ERR_OUT_OF_RANGE', 'length');
+  validateOffsetLengthRead(offset, length, buffer.length);
 
   if (!isUint32(position))
     position = -1;