Added an assertion to QrCode.encodeSegmentsAdvanced() in all language versions.

c/qrcodegen.c

@@ -927,6 +927,7 @@ bool qrcodegen_encodeSegmentsAdvanced(const struct qrcodegen_Segment segs[], siz
 		for (int j = 0; j < seg->bitLength; j++)
 			appendBitsToBuffer((seg->data[j >> 3] >> (7 - (j & 7))) & 1, 1, qrcode, &bitLen);
 	}
+	assert(bitLen == dataUsedBits);
 	
 	// Add terminator and pad up to a byte if applicable
 	int dataCapacityBits = getNumDataCodewords(version, ecl) * 8;

cpp/QrCode.cpp

@@ -93,6 +93,8 @@ QrCode QrCode::encodeSegments(const vector<QrSegment> &segs, Ecc ecl,
 		bb.appendBits(seg.getNumChars(), seg.getMode().numCharCountBits(version));
 		bb.insert(bb.end(), seg.getData().begin(), seg.getData().end());
 	}
+	if (bb.size() != static_cast<size_t>(dataUsedBits))
+		throw std::logic_error("Assertion error");
 	
 	// Add terminator and pad up to a byte if applicable
 	size_t dataCapacityBits = getNumDataCodewords(version, ecl) * 8;

java/io/nayuki/qrcodegen/QrCode.java

@@ -147,6 +147,7 @@ public final class QrCode {
 			bb.appendBits(seg.numChars, seg.mode.numCharCountBits(version));
 			bb.appendData(seg.data);
 		}
+		assert bb.bitLength() == dataUsedBits;
 		
 		// Add terminator and pad up to a byte if applicable
 		int dataCapacityBits = getNumDataCodewords(version, ecl) * 8;

javascript/qrcodegen.js

@@ -563,6 +563,8 @@ var qrcodegen = new function() {
 				bb.push(bit);
 			});
 		});
+		if (bb.length != dataUsedBits)
+			throw "Assertion error";
 		
 		// Add terminator and pad up to a byte if applicable
 		var dataCapacityBits = QrCode.getNumDataCodewords(version, ecl) * 8;

python/qrcodegen.py

@@ -121,6 +121,7 @@ class QrCode(object):
 			bb.append_bits(seg.get_mode().get_mode_bits(), 4)
 			bb.append_bits(seg.get_num_chars(), seg.get_mode().num_char_count_bits(version))
 			bb.extend(seg._bitdata)
+		assert len(bb) == datausedbits
 		
 		# Add terminator and pad up to a byte if applicable
 		datacapacitybits = QrCode._get_num_data_codewords(version, ecl) * 8

rust/src/lib.rs

@@ -136,6 +136,7 @@ impl QrCode {
 			bb.append_bits(seg.numchars as u32, seg.mode.num_char_count_bits(version));
 			bb.0.extend_from_slice(&seg.data);
 		}
+		assert_eq!(bb.0.len(), datausedbits);
 		
 		// Add terminator and pad up to a byte if applicable
 		let datacapacitybits: usize = QrCode::get_num_data_codewords(version, ecl) * 8;

typescript/qrcodegen.ts

@@ -108,6 +108,8 @@ namespace qrcodegen {
 				seg.getBits().forEach(
 					(b: bit) => bb.push(b));
 			});
+			if (bb.length != dataUsedBits)
+				throw "Assertion error";
 			
 			// Add terminator and pad up to a byte if applicable
 			let dataCapacityBits: int = QrCode.getNumDataCodewords(version, ecl) * 8;