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ViaThinkSoft CodeLib

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CodeLib → Programming aids → C / C++

CodeLib C / C++: Read single bits from stream (Big Endian)
static int next_bit_BE(int input) {
        static unsigned char byte;
        static unsigned int bits = 0;
        if (bits == 0) {
                if (!read(input, &byte, 1)) return -1;
                bits=8;
        }
        int bit = (unsigned char)(byte & 0x80) >> 7;
        byte = (unsigned char)byte << 1;
        bits--;
        return bit;
}

int next_code_BE(int input, int code_length) {
        code = 0;
        for (int i=0; i<code_length; i++) {
                int bit = next_bit_BE(input);
                if (bit == -1) break; // done
                code = (code<<1) | bit;
        }
        return code;
}

(nicht getestet)
Daniel Marschall
ViaThinkSoft Co-Founder
Autor: Daniel Marschall
Datum: 16 February 2018
Gelesen: 9,961 Mal