restart()

static JRESULT fl::third_party::restart ( JDEC * jd, uint16_t rstn )

static

Definition at line 517 of file tjpgd.cpp.hpp.

{
    unsigned int i;
    uint8_t *dp = jd->dptr;
    size_t dc = jd->dctr;
 
#if JD_FASTDECODE == 0
    uint16_t d = 0;
 
    /* Get two bytes from the input stream */
    for (i = 0; i < 2; i++) {
        if (!dc) {  /* No input data is available, re-fill input buffer */
            dp = jd->inbuf;
            dc = jd->infunc(jd, dp, JD_SZBUF);
            if (!dc) return JDR_INP;
        } else {
            dp++;
        }
        dc--;
        d = d << 8 | *dp;   /* Get a byte */
    }
    jd->dptr = dp; jd->dctr = dc; jd->dbit = 0;
 
    /* Check the marker */
    if ((d & 0xFFD8) != 0xFFD0 || (d & 7) != (rstn & 7)) {
        return JDR_FMT1;    /* Err: expected RSTn marker is not detected (may be collapted data) */
    }
 
#else
    uint16_t marker;
 
 
    if (jd->marker) {   /* Generate a maker if it has been detected */
        marker = 0xFF00 | jd->marker;
        jd->marker = 0;
    } else {
        marker = 0;
        for (i = 0; i < 2; i++) {   /* Get a restart marker */
            if (!dc) {      /* No input data is available, re-fill input buffer */
                dp = jd->inbuf;
                dc = jd->infunc(jd, dp, JD_SZBUF);
                if (!dc) return JDR_INP;
            }
            marker = (marker << 8) | *dp++; /* Get a byte */
            dc--;
        }
        jd->dptr = dp; jd->dctr = dc;
    }
 
    /* Check the marker */
    if ((marker & 0xFFD8) != 0xFFD0 || (marker & 7) != (rstn & 7)) {
        return JDR_FMT1;    /* Err: expected RSTn marker was not detected (may be collapted data) */
    }
 
    jd->dbit = 0;           /* Discard stuff bits */
#endif
 
    jd->dcv[2] = jd->dcv[1] = jd->dcv[0] = 0;  /* Reset DC offset */
    return JDR_OK;
}

References FL_NOEXCEPT, JD_SZBUF, JDR_FMT1, JDR_INP, and JDR_OK.

Referenced by jd_decomp(), and jd_decomp_progressive().

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