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qt'ct_data_s (./qt-2.1.0/src/3rdparty/zlib/deflate.h:50)

typedef struct ct_data_s {
    union {
        ush  freq;       /* frequency count */
        ush  code;       /* bit string */
    } fc;
    union {
        ush  dad;        /* father node in Huffman tree */
        ush  len;        /* length of bit string */
    } dl;