Function DecodeContent

czxing/src/main/cpp/zxing/src/aztec/AZDecoder.cpp:252–299

}

static void DecodeContent(const BitArray& bits, Content& res)
{
	Table latchTable = Table::UPPER; // table most recently latched to
	Table shiftTable = Table::UPPER; // table to use for the next read

	auto remBits = BitArrayView(bits);

	while (remBits.size() >= (shiftTable == Table::DIGIT ? 4 : 5)) { // see ISO/IEC 24778:2008 7.3.1.2 regarding padding bits
		if (shiftTable == Table::BINARY) {
			int length = remBits.readBits(5);
			if (length == 0)
				length = remBits.readBits(11) + 31;
			for (int i = 0; i < length; i++)
				res.push_back(remBits.readBits(8));
			// Go back to whatever mode we had been in
			shiftTable = latchTable;
		} else {
			int size = shiftTable == Table::DIGIT ? 4 : 5;
			int code = remBits.readBits(size);
			const char* str = GetCharacter(shiftTable, code);
			if (std::strncmp(str, "CTRL_", 5) == 0) {
				// Table changes
				// ISO/IEC 24778:2008 prescibes ending a shift sequence in the mode from which it was invoked.
				// That's including when that mode is a shift.
				// Our test case dlusbs.png for issue #642 exercises that.
				latchTable = shiftTable;  // Latch the current mode, so as to return to Upper after U/S B/S
				shiftTable = GetTable(str[5]);
				if (str[6] == 'L')
					latchTable = shiftTable;
			} else if (std::strcmp(str, "FLGN") == 0) {
				int flg = remBits.readBits(3);
				if (flg == 0) { // FNC1
					res.push_back(29); // May be removed at end if first/second FNC1
				} else if (flg <= 6) {
					// FLG(1) to FLG(6) ECI
					res.switchEncoding(ParseECIValue(remBits, flg));
				} else {
					// FLG(7) is invalid
				}
				shiftTable = latchTable;
			} else {
				res.append(str);
				// Go back to whatever mode we had been in
				shiftTable = latchTable;
			}
		}
	}
}

ZXING_EXPORT_TEST_ONLY
DecoderResult Decode(const BitArray& bits)