Modify big integer library

This patch follows https://pdfium.googlesource.com/pdfium/+/44047c3300d07192a67b1714084cc2d43b1e9bd9

Modify the library to resolve compile error,
add copyright notice and change pdfium.gyp and BUILD.gn

R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/754743003

1 files changed, 30 insertions, 4 deletions

diff --git a/third_party/bigint/BigInteger.hh b/third_party/bigint/BigInteger.hh
index cf6e91056f..a239d3c954 100644
--- a/third_party/bigint/BigInteger.hh
+++ b/third_party/bigint/BigInteger.hh
@@ -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.
+
 #ifndef BIGINTEGER_H
 #define BIGINTEGER_H
 
@@ -157,14 +163,24 @@ inline BigInteger BigInteger::operator *(const BigInteger &x) const {
 	return ans;
 }
 inline BigInteger BigInteger::operator /(const BigInteger &x) const {
-	if (x.isZero()) throw "BigInteger::operator /: division by zero";
+	if (x.isZero())
+#ifdef FOXIT_CHROME_BUILD
+        abort();
+#else
+        throw "BigInteger::operator /: division by zero";
+#endif
 	BigInteger q, r;
 	r = *this;
 	r.divideWithRemainder(x, q);
 	return q;
 }
 inline BigInteger BigInteger::operator %(const BigInteger &x) const {
-	if (x.isZero()) throw "BigInteger::operator %: division by zero";
+	if (x.isZero())
+#ifdef FOXIT_CHROME_BUILD
+        abort();
+#else
+        throw "BigInteger::operator %: division by zero";
+#endif
 	BigInteger q, r;
 	r = *this;
 	r.divideWithRemainder(x, q);
@@ -193,7 +209,12 @@ inline void BigInteger::operator *=(const BigInteger &x) {
 	multiply(*this, x);
 }
 inline void BigInteger::operator /=(const BigInteger &x) {
-	if (x.isZero()) throw "BigInteger::operator /=: division by zero";
+	if (x.isZero())
+#ifdef FOXIT_CHROME_BUILD
+        abort();
+#else
+        throw "BigInteger::operator /=: division by zero";
+#endif
 	/* The following technique is slightly faster than copying *this first
 	 * when x is large. */
 	BigInteger q;
@@ -202,7 +223,12 @@ inline void BigInteger::operator /=(const BigInteger &x) {
 	*this = q;
 }
 inline void BigInteger::operator %=(const BigInteger &x) {
-	if (x.isZero()) throw "BigInteger::operator %=: division by zero";
+	if (x.isZero())
+#ifdef FOXIT_CHROME_BUILD
+        abort();
+#else
+        throw "BigInteger::operator %=: division by zero";
+#endif
 	BigInteger q;
 	// Mods *this by x.  Don't care about quotient left in q.
 	divideWithRemainder(x, q);