Modify big integer library

third_party/bigint/BigUnsigned.cc

Index: third_party/bigint/BigUnsigned.cc
diff --git a/third_party/bigint/BigUnsigned.cc b/third_party/bigint/BigUnsigned.cc
index d7f9889cc69846de1030d740748789a506802bab..863fadcb39846804c688e5688e25fc74dd6ebf25 100644
--- a/third_party/bigint/BigUnsigned.cc
+++ b/third_party/bigint/BigUnsigned.cc
@@ -1,3 +1,9 @@
+// Copyright 2014 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code by Matt McCutchen, see the LICENSE file.
+
 #include "BigUnsigned.hh"
 
 // Memory management definitions have moved to the bottom of NumberlikeArray.hh.
@@ -189,8 +195,12 @@ void BigUnsigned::subtract(const BigUnsigned &a, const BigUnsigned &b) {
 		return;
 	} else if (a.len < b.len)
 		// If a is shorter than b, the result is negative.
+#ifdef FOXIT_CHROME_BUILD
+        abort();
+#else
 		throw "BigUnsigned::subtract: "
 			"Negative result in unsigned calculation";
+#endif
 	// Some variables...
 	bool borrowIn, borrowOut;
 	Blk temp;
@@ -223,7 +233,11 @@ void BigUnsigned::subtract(const BigUnsigned &a, const BigUnsigned &b) {
 	 * predictable state. */
 	if (borrowIn) {
 		len = 0;
+#ifdef FOXIT_CHROME_BUILD
+        abort();
+#else
 		throw "BigUnsigned::subtract: Negative result in unsigned calculation";
+#endif
 	} else
 		// Copy over the rest of the blocks
 		for (; i < a.len; i++)
@@ -386,7 +400,11 @@ void BigUnsigned::divideWithRemainder(const BigUnsigned &b, BigUnsigned &q) {
 	 * It would be silly to try to write quotient and remainder to the
 	 * same variable.  Rule that out right away. */
 	if (this == &q)
+#ifdef FOXIT_CHROME_BUILD
+        abort();
+#else
 		throw "BigUnsigned::divideWithRemainder: Cannot write quotient and remainder into the same variable";
+#endif
 	/* Now *this and q are separate, so the only concern is that b might be
 	 * aliased to one of them.  If so, use a temporary copy of b. */
 	if (this == &b || &q == &b) {
@@ -596,8 +614,12 @@ void BigUnsigned::bitShiftLeft(const BigUnsigned &a, int b) {
 	DTRT_ALIASED(this == &a, bitShiftLeft(a, b));
 	if (b < 0) {
 		if (b << 1 == 0)
+#ifdef FOXIT_CHROME_BUILD
+            abort();
+#else
 			throw "BigUnsigned::bitShiftLeft: "
 				"Pathological shift amount not implemented";
+#endif
 		else {
 			bitShiftRight(a, -b);
 			return;
@@ -622,8 +644,12 @@ void BigUnsigned::bitShiftRight(const BigUnsigned &a, int b) {
 	DTRT_ALIASED(this == &a, bitShiftRight(a, b));
 	if (b < 0) {
 		if (b << 1 == 0)
+#ifdef FOXIT_CHROME_BUILD
+            abort();
+#else
 			throw "BigUnsigned::bitShiftRight: "
 				"Pathological shift amount not implemented";
+#endif
 		else {
 			bitShiftLeft(a, -b);
 			return;
@@ -679,7 +705,11 @@ void BigUnsigned::operator ++(int) {
 // Prefix decrement
 void BigUnsigned::operator --() {
 	if (len == 0)
+#ifdef FOXIT_CHROME_BUILD
+        abort();
+#else
 		throw "BigUnsigned::operator --(): Cannot decrement an unsigned zero";
+#endif
 	Index i;
 	bool borrow = true;
 	for (i = 0; borrow; i++) {