Fix ParseUint to support all possible numbers

Fixes #461

bytesconv.go

@@ -183,7 +183,8 @@ func parseUintBuf(b []byte) (int, int, error) {
 			}
 			return v, i, nil
 		}
-		if i >= maxIntChars {
+		// Test for overflow.
+		if v*10 < v {
 			return -1, i, errTooLongInt
 		}
 		v = 10*v + int(k)

bytesconv_32.go

@@ -3,6 +3,5 @@
 package fasthttp
 
 const (
-	maxIntChars    = 9
 	maxHexIntChars = 7
 )

bytesconv_64.go

@@ -3,6 +3,5 @@
 package fasthttp
 
 const (
-	maxIntChars    = 18
 	maxHexIntChars = 15
 )

bytesconv_64_test.go

@@ -38,4 +38,5 @@ func TestParseUintSuccess(t *testing.T) {
 	testParseUintSuccess(t, "123", 123)
 	testParseUintSuccess(t, "1234567890", 1234567890)
 	testParseUintSuccess(t, "123456789012345678", 123456789012345678)
+	testParseUintSuccess(t, "9223372036854775807", 9223372036854775807)
 }

bytesconv_test.go

@@ -176,6 +176,7 @@ func TestParseUintError(t *testing.T) {
 
 	// too big num
 	testParseUintError(t, "12345678901234567890")
+	testParseUintError(t, "1234567890123456789012")
 }
 
 func TestParseUfloatSuccess(t *testing.T) {