Simplified and clarified a few bits of code, without changing behavior.

cpp/QrCode.cpp

@@ -569,8 +569,8 @@ vector<uint8_t> QrCode::reedSolomonComputeRemainder(const vector<uint8_t> &data,
 		uint8_t factor = b ^ result.at(0);
 		result.erase(result.begin());
 		result.push_back(0);
-		for (size_t j = 0; j < result.size(); j++)
-			result.at(j) ^= reedSolomonMultiply(divisor.at(j), factor);
+		for (size_t i = 0; i < result.size(); i++)
+			result.at(i) ^= reedSolomonMultiply(divisor.at(i), factor);
 	}
 	return result;
 }

java/src/main/java/io/nayuki/qrcodegen/QrCode.java

@@ -768,7 +768,7 @@ public final class QrCode {
 	// Returns the product of the two given field elements modulo GF(2^8/0x11D). The arguments and result
 	// are unsigned 8-bit integers. This could be implemented as a lookup table of 256*256 entries of uint8.
 	private static int reedSolomonMultiply(int x, int y) {
-		assert x >>> 8 == 0 && y >>> 8 == 0;
+		assert x >> 8 == 0 && y >> 8 == 0;
 		// Russian peasant multiplication
 		int z = 0;
 		for (int i = 7; i >= 0; i--) {

python/qrcodegen.py

@@ -567,7 +567,7 @@ class QrCode(object):
 	def _reed_solomon_compute_divisor(degree):
 		"""Returns a Reed-Solomon ECC generator polynomial for the given degree. This could be
 		implemented as a lookup table over all possible parameter values, instead of as an algorithm."""
-		if degree < 1 or degree > 255:
+		if not (1 <= degree <= 255):
 			raise ValueError("Degree out of range")
 		# Polynomial coefficients are stored from highest to lowest power, excluding the leading term which is always 1.
 		# For example the polynomial x^3 + 255x^2 + 8x + 93 is stored as the uint8 array [255, 8, 93].