static int jpeg2000_read_main_headers(Jpeg2000DecoderContext *s) { Jpeg2000CodingStyle *codsty = s->codsty; Jpeg2000QuantStyle *qntsty = s->qntsty; uint8_t *properties = s->properties; for (;;) { int len, ret = 0; uint16_t marker; int oldpos; if (bytestream2_get_bytes_left(&s->g) < 2) { av_log(s->avctx, AV_LOG_ERROR, "Missing EOC\n"); break; } marker = bytestream2_get_be16u(&s->g); oldpos = bytestream2_tell(&s->g); if (marker == JPEG2000_SOD) { Jpeg2000Tile *tile = s->tile + s->curtileno; Jpeg2000TilePart *tp = tile->tile_part + tile->tp_idx; bytestream2_init(&tp->tpg, s->g.buffer, tp->tp_end - s->g.buffer); bytestream2_skip(&s->g, tp->tp_end - s->g.buffer); continue; } if (marker == JPEG2000_EOC) break; if (bytestream2_get_bytes_left(&s->g) < 2) return AVERROR(EINVAL); len = bytestream2_get_be16u(&s->g); switch (marker) { case JPEG2000_SIZ: ret = get_siz(s); if (!s->tile) s->numXtiles = s->numYtiles = 0; break; case JPEG2000_COC: ret = get_coc(s, codsty, properties); break; case JPEG2000_COD: ret = get_cod(s, codsty, properties); break; case JPEG2000_QCC: ret = get_qcc(s, len, qntsty, properties); break; case JPEG2000_QCD: ret = get_qcd(s, len, qntsty, properties); break; case JPEG2000_SOT: if (!(ret = get_sot(s, len))) { av_assert1(s->curtileno >= 0); codsty = s->tile[s->curtileno].codsty; qntsty = s->tile[s->curtileno].qntsty; properties = s->tile[s->curtileno].properties; } break; case JPEG2000_COM: // the comment is ignored bytestream2_skip(&s->g, len - 2); break; case JPEG2000_TLM: // Tile-part lengths ret = get_tlm(s, len); break; default: av_log(s->avctx, AV_LOG_ERROR, "unsupported marker 0x%.4X at pos 0x%X\n", marker, bytestream2_tell(&s->g) - 4); bytestream2_skip(&s->g, len - 2); break; } if (bytestream2_tell(&s->g) - oldpos != len || ret) { av_log(s->avctx, AV_LOG_ERROR, "error during processing marker segment %.4x\n", marker); return ret ? ret : -1; } } return 0; }