static int get_qcx(Jpeg2000DecoderContext *s, int n, Jpeg2000QuantStyle *q) { int i, x; if (s->buf_end - s->buf < 1) return AVERROR(EINVAL); x = bytestream_get_byte(&s->buf); // Sqcd q->nguardbits = x >> 5; q->quantsty = x & 0x1f; if (q->quantsty == JPEG2000_QSTY_NONE) { n -= 3; if (s->buf_end - s->buf < n || 32*3 < n) return AVERROR(EINVAL); for (i = 0; i < n; i++) q->expn[i] = bytestream_get_byte(&s->buf) >> 3; } else if (q->quantsty == JPEG2000_QSTY_SI) { if (s->buf_end - s->buf < 2) return AVERROR(EINVAL); x = bytestream_get_be16(&s->buf); q->expn[0] = x >> 11; q->mant[0] = x & 0x7ff; for (i = 1; i < 32 * 3; i++) { int curexpn = FFMAX(0, q->expn[0] - (i - 1) / 3); q->expn[i] = curexpn; q->mant[i] = q->mant[0]; } } else { n = (n - 3) >> 1; if (s->buf_end - s->buf < 2 * n || 32*3 < n) return AVERROR(EINVAL); for (i = 0; i < n; i++) { x = bytestream_get_be16(&s->buf); q->expn[i] = x >> 11; q->mant[i] = x & 0x7ff; } } return 0; }
static int get_qcx(Jpeg2000DecoderContext *s, int n, Jpeg2000QuantStyle *q) { int i, x; if (s->buf_end - s->buf < 1) return AVERROR(EINVAL); x = bytestream_get_byte(&s->buf);  