| /* |
| * The copyright in this software is being made available under the 2-clauses |
| * BSD License, included below. This software may be subject to other third |
| * party and contributor rights, including patent rights, and no such rights |
| * are granted under this license. |
| * |
| * Copyright (c) 2002-2014, Universite catholique de Louvain (UCL), Belgium |
| * Copyright (c) 2002-2014, Professor Benoit Macq |
| * Copyright (c) 2001-2003, David Janssens |
| * Copyright (c) 2002-2003, Yannick Verschueren |
| * Copyright (c) 2003-2007, Francois-Olivier Devaux |
| * Copyright (c) 2003-2014, Antonin Descampe |
| * Copyright (c) 2005, Herve Drolon, FreeImage Team |
| * Copyright (c) 2008, Jerome Fimes, Communications & Systemes <jerome.fimes@c-s.fr> |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS' |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef OPJ_MQC_INL_H |
| #define OPJ_MQC_INL_H |
| |
| /* For internal use of opj_mqc_decode_macro() */ |
| #define opj_mqc_mpsexchange_macro(d, curctx, a) \ |
| { \ |
| if (a < (*curctx)->qeval) { \ |
| d = !((*curctx)->mps); \ |
| *curctx = (*curctx)->nlps; \ |
| } else { \ |
| d = (*curctx)->mps; \ |
| *curctx = (*curctx)->nmps; \ |
| } \ |
| } |
| |
| /* For internal use of opj_mqc_decode_macro() */ |
| #define opj_mqc_lpsexchange_macro(d, curctx, a) \ |
| { \ |
| if (a < (*curctx)->qeval) { \ |
| a = (*curctx)->qeval; \ |
| d = (*curctx)->mps; \ |
| *curctx = (*curctx)->nmps; \ |
| } else { \ |
| a = (*curctx)->qeval; \ |
| d = !((*curctx)->mps); \ |
| *curctx = (*curctx)->nlps; \ |
| } \ |
| } |
| |
| |
| /** |
| Decode a symbol using raw-decoder. Cfr p.506 TAUBMAN |
| @param mqc MQC handle |
| @return Returns the decoded symbol (0 or 1) |
| */ |
| static INLINE OPJ_UINT32 opj_mqc_raw_decode(opj_mqc_t *mqc) |
| { |
| OPJ_UINT32 d; |
| if (mqc->ct == 0) { |
| /* Given opj_mqc_raw_init_dec() we know that at some point we will */ |
| /* have a 0xFF 0xFF artificial marker */ |
| if (mqc->c == 0xff) { |
| if (*mqc->bp > 0x8f) { |
| mqc->c = 0xff; |
| mqc->ct = 8; |
| } else { |
| mqc->c = *mqc->bp; |
| mqc->bp ++; |
| mqc->ct = 7; |
| } |
| } else { |
| mqc->c = *mqc->bp; |
| mqc->bp ++; |
| mqc->ct = 8; |
| } |
| } |
| mqc->ct--; |
| d = ((OPJ_UINT32)mqc->c >> mqc->ct) & 0x01U; |
| |
| return d; |
| } |
| |
| |
| #define opj_mqc_bytein_macro(mqc, c, ct) \ |
| { \ |
| OPJ_UINT32 l_c; \ |
| /* Given opj_mqc_init_dec() we know that at some point we will */ \ |
| /* have a 0xFF 0xFF artificial marker */ \ |
| l_c = *(mqc->bp + 1); \ |
| if (*mqc->bp == 0xff) { \ |
| if (l_c > 0x8f) { \ |
| c += 0xff00; \ |
| ct = 8; \ |
| mqc->end_of_byte_stream_counter ++; \ |
| } else { \ |
| mqc->bp++; \ |
| c += l_c << 9; \ |
| ct = 7; \ |
| } \ |
| } else { \ |
| mqc->bp++; \ |
| c += l_c << 8; \ |
| ct = 8; \ |
| } \ |
| } |
| |
| /* For internal use of opj_mqc_decode_macro() */ |
| #define opj_mqc_renormd_macro(mqc, a, c, ct) \ |
| { \ |
| do { \ |
| if (ct == 0) { \ |
| opj_mqc_bytein_macro(mqc, c, ct); \ |
| } \ |
| a <<= 1; \ |
| c <<= 1; \ |
| ct--; \ |
| } while (a < 0x8000); \ |
| } |
| |
| #define opj_mqc_decode_macro(d, mqc, curctx, a, c, ct) \ |
| { \ |
| /* Implements ISO 15444-1 C.3.2 Decoding a decision (DECODE) */ \ |
| /* Note: alternate "J.2 - Decoding an MPS or an LPS in the */ \ |
| /* software-conventions decoder" has been tried, but does not bring any */ \ |
| /* improvement. See https://github.com/uclouvain/openjpeg/issues/921 */ \ |
| a -= (*curctx)->qeval; \ |
| if ((c >> 16) < (*curctx)->qeval) { \ |
| opj_mqc_lpsexchange_macro(d, curctx, a); \ |
| opj_mqc_renormd_macro(mqc, a, c, ct); \ |
| } else { \ |
| c -= (*curctx)->qeval << 16; \ |
| if ((a & 0x8000) == 0) { \ |
| opj_mqc_mpsexchange_macro(d, curctx, a); \ |
| opj_mqc_renormd_macro(mqc, a, c, ct); \ |
| } else { \ |
| d = (*curctx)->mps; \ |
| } \ |
| } \ |
| } |
| |
| #define DOWNLOAD_MQC_VARIABLES(mqc, curctx, c, a, ct) \ |
| register const opj_mqc_state_t **curctx = mqc->curctx; \ |
| register OPJ_UINT32 c = mqc->c; \ |
| register OPJ_UINT32 a = mqc->a; \ |
| register OPJ_UINT32 ct = mqc->ct |
| |
| #define UPLOAD_MQC_VARIABLES(mqc, curctx, c, a, ct) \ |
| mqc->curctx = curctx; \ |
| mqc->c = c; \ |
| mqc->a = a; \ |
| mqc->ct = ct; |
| |
| /** |
| Input a byte |
| @param mqc MQC handle |
| */ |
| static INLINE void opj_mqc_bytein(opj_mqc_t *const mqc) |
| { |
| opj_mqc_bytein_macro(mqc, mqc->c, mqc->ct); |
| } |
| |
| /** |
| Renormalize mqc->a and mqc->c while decoding |
| @param mqc MQC handle |
| */ |
| #define opj_mqc_renormd(mqc) \ |
| opj_mqc_renormd_macro(mqc, mqc->a, mqc->c, mqc->ct) |
| |
| /** |
| Decode a symbol |
| @param d OPJ_UINT32 value where to store the decoded symbol |
| @param mqc MQC handle |
| @return Returns the decoded symbol (0 or 1) in d |
| */ |
| #define opj_mqc_decode(d, mqc) \ |
| opj_mqc_decode_macro(d, mqc, mqc->curctx, mqc->a, mqc->c, mqc->ct) |
| |
| #endif /* OPJ_MQC_INL_H */ |