Fixed some arithmetic checks in Java and C code.

c/qrcodegen.c

@@ -346,7 +346,7 @@ static void encodeQrCodeTail(uint8_t dataAndQrcode[], int bitLen, uint8_t tempBu
 
 // Appends the given sequence of bits to the given byte-based bit buffer, increasing the bit length.
 testable void appendBitsToBuffer(unsigned int val, int numBits, uint8_t buffer[], int *bitLen) {
-	assert(0 <= numBits && numBits <= 16 && (long)val >> numBits == 0);
+	assert(0 <= numBits && numBits <= 16 && (unsigned long)val >> numBits == 0);
 	for (int i = numBits - 1; i >= 0; i--, (*bitLen)++)
 		buffer[*bitLen >> 3] |= ((val >> i) & 1) << (7 - (*bitLen & 7));
 }

java/io/nayuki/qrcodegen/BitBuffer.java

@@ -59,7 +59,7 @@ public final class BitBuffer implements Cloneable {
 	
 	// Returns the bit at the given index, yielding 0 or 1, or throwing IndexOutOfBoundsException.
 	public int getBit(int index) {
-		if (index < 0 || index > bitLength)
+		if (index < 0 || index >= bitLength)
 			throw new IndexOutOfBoundsException();
 		return data.get(index) ? 1 : 0;
 	}