949     uint8_t * seg, b;  in jd_prepare()  local
964     jd->inbuf = seg = alloc_pool(jd, JD_SZBUF);     /* Allocate stream input buffer */  in jd_prepare()
965     if(!seg) return JDR_MEM1;  in jd_prepare()
969         if(jd->infunc(jd, seg, 1) != 1) return JDR_INP;     /* Err: SOI was not detected */  in jd_prepare()
971         marker = marker << 8 | seg[0];  in jd_prepare()
976         if(jd->infunc(jd, seg, 4) != 4) return JDR_INP;  in jd_prepare()
977         marker = LDB_WORD(seg);     /* Marker */  in jd_prepare()
978         len = LDB_WORD(seg + 2);    /* Length field */  in jd_prepare()
986                 if(jd->infunc(jd, seg, len) != len) return JDR_INP;     /* Load segment data */  in jd_prepare()
988                 jd->width = LDB_WORD(&seg[3]);      /* Image width in unit of pixel */  in jd_prepare()
989                 jd->height = LDB_WORD(&seg[1]);     /* Image height in unit of pixel */  in jd_prepare()
990                 jd->ncomp = seg[5];                 /* Number of color components */  in jd_prepare()
995                     b = seg[7 + 3 * i];                         /* Get sampling factor */  in jd_prepare()
1006 …      jd->qtid[i] = seg[8 + 3 * i];               /* Get dequantizer table ID for this component */  in jd_prepare()
1013                 if(jd->infunc(jd, seg, len) != len) return JDR_INP;     /* Load segment data */  in jd_prepare()
1015                 jd->nrst = LDB_WORD(seg);   /* Get restart interval (MCUs) */  in jd_prepare()
1020                 if(jd->infunc(jd, seg, len) != len) return JDR_INP;     /* Load segment data */  in jd_prepare()
1022                 rc = create_huffman_tbl(jd, seg, len);  /* Create huffman tables */  in jd_prepare()
1028                 if(jd->infunc(jd, seg, len) != len) return JDR_INP;     /* Load segment data */  in jd_prepare()
1030                 rc = create_qt_tbl(jd, seg, len);   /* Create de-quantizer tables */  in jd_prepare()
1036                 if(jd->infunc(jd, seg, len) != len) return JDR_INP;     /* Load segment data */  in jd_prepare()
1039                 if(seg[0] != jd->ncomp) return JDR_FMT3;        /* Err: Wrong color components */  in jd_prepare()
1043                     b = seg[2 + 2 * i]; /* Get huffman table ID */  in jd_prepare()
1067                     jd->dctr = jd->infunc(jd, seg + ofs, (size_t)(JD_SZBUF - ofs));  in jd_prepare()
1069                 jd->dptr = seg + ofs - (JD_FASTDECODE ? 0 : 1);  in jd_prepare()