52 typedef struct JDEC JDEC;  typedef
53 struct JDEC {  struct
54     size_t dctr;                /* Number of bytes available in the input buffer */
55     uint8_t * dptr;             /* Current data read ptr */
56     uint8_t * inbuf;            /* Bit stream input buffer */
57     uint8_t dbit;               /* Number of bits available in wreg or reading bit mask */
58     uint8_t scale;              /* Output scaling ratio */
59     uint8_t msx, msy;           /* MCU size in unit of block (width, height) */
60     uint8_t qtid[3];            /* Quantization table ID of each component, Y, Cb, Cr */
61     uint8_t ncomp;              /* Number of color components 1:grayscale, 3:color */
85     size_t (*infunc)(JDEC *, uint8_t *, size_t); /* Pointer to jpeg stream input function */  argument
92 JRESULT jd_prepare(JDEC * jd, size_t (*infunc)(JDEC *, uint8_t *, size_t), void * pool, size_t sz_p…  argument