bitmask.cpp

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/**
 * @file
 * @copyright
 *   SPDX-FileCopyrightText: 2023-2024 European Southern Observatory (ESO)
 *
 *   SPDX-License-Identifier: LGPL-3.0-only
 */
#include <numapp/bitmask.hpp>
 
#include <ostream>
 
namespace numapp {
 
std::ostream& FormatBitmask(std::ostream& os, bitmask const* mask, int min_bits) {
    unsigned char value = 0;
    // print value as hex char every 4 bits, starting from msb but minimum min_bits number of bits.
    for (int bit_num = mask->size - 1; bit_num >= 0; --bit_num) {
        if (numa_bitmask_isbitset(mask, bit_num)) {
            value |= (1u << (bit_num % 4));
            min_bits = bit_num;
        }
        if (bit_num > min_bits) {
            continue;
        }
        if (bit_num % 4 == 0) {
            if (value >= 0u && value < 10u) {
                os.put('0' + value);
            } else if (value >= 10u && value < 16u) {
                os.put('a' - 10 + value);
            } else {
                os.put('?');
            }
            value = 0;
        }
    }
    return os;
}
 
}  // namespace numapp