| /* |
| * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium |
| * Copyright (c) 2002-2007, Professor Benoit Macq |
| * Copyright (c) 2002-2003, Yannick Verschueren |
| * Copyright (c) 2005, Herve Drolon, FreeImage Team |
| * 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. |
| */ |
| |
| #include "opj_includes.h" |
| |
| /* |
| * Read the information contains in VBAS [JPP/JPT stream message header] |
| * Store information (7 bits) in value |
| * |
| */ |
| unsigned int jpt_read_VBAS_info(opj_cio_t *cio, unsigned int value) { |
| unsigned char elmt; |
| |
| elmt = cio_read(cio, 1); |
| while ((elmt >> 7) == 1) { |
| value = (value << 7); |
| value |= (elmt & 0x7f); |
| elmt = cio_read(cio, 1); |
| } |
| value = (value << 7); |
| value |= (elmt & 0x7f); |
| |
| return value; |
| } |
| |
| /* |
| * Initialize the value of the message header structure |
| * |
| */ |
| void jpt_init_msg_header(opj_jpt_msg_header_t * header) { |
| header->Id = 0; /* In-class Identifier */ |
| header->last_byte = 0; /* Last byte information */ |
| header->Class_Id = 0; /* Class Identifier */ |
| header->CSn_Id = 0; /* CSn : index identifier */ |
| header->Msg_offset = 0; /* Message offset */ |
| header->Msg_length = 0; /* Message length */ |
| header->Layer_nb = 0; /* Auxiliary for JPP case */ |
| } |
| |
| /* |
| * Re-initialize the value of the message header structure |
| * |
| * Only parameters always present in message header |
| * |
| */ |
| void jpt_reinit_msg_header(opj_jpt_msg_header_t * header) { |
| header->Id = 0; /* In-class Identifier */ |
| header->last_byte = 0; /* Last byte information */ |
| header->Msg_offset = 0; /* Message offset */ |
| header->Msg_length = 0; /* Message length */ |
| } |
| |
| /* |
| * Read the message header for a JPP/JPT - stream |
| * |
| */ |
| void jpt_read_msg_header(opj_common_ptr cinfo, opj_cio_t *cio, opj_jpt_msg_header_t *header) { |
| unsigned char elmt, Class = 0, CSn = 0; |
| jpt_reinit_msg_header(header); |
| |
| /* ------------- */ |
| /* VBAS : Bin-ID */ |
| /* ------------- */ |
| elmt = cio_read(cio, 1); |
| |
| /* See for Class and CSn */ |
| switch ((elmt >> 5) & 0x03) { |
| case 0: |
| opj_event_msg(cinfo, EVT_ERROR, "Forbidden value encounter in message header !!\n"); |
| break; |
| case 1: |
| Class = 0; |
| CSn = 0; |
| break; |
| case 2: |
| Class = 1; |
| CSn = 0; |
| break; |
| case 3: |
| Class = 1; |
| CSn = 1; |
| break; |
| default: |
| break; |
| } |
| |
| /* see information on bits 'c' [p 10 : A.2.1 general, ISO/IEC FCD 15444-9] */ |
| if (((elmt >> 4) & 0x01) == 1) |
| header->last_byte = 1; |
| |
| /* In-class identifier */ |
| header->Id |= (elmt & 0x0f); |
| if ((elmt >> 7) == 1) |
| header->Id = jpt_read_VBAS_info(cio, header->Id); |
| |
| /* ------------ */ |
| /* VBAS : Class */ |
| /* ------------ */ |
| if (Class == 1) { |
| header->Class_Id = 0; |
| header->Class_Id = jpt_read_VBAS_info(cio, header->Class_Id); |
| } |
| |
| /* ---------- */ |
| /* VBAS : CSn */ |
| /* ---------- */ |
| if (CSn == 1) { |
| header->CSn_Id = 0; |
| header->CSn_Id = jpt_read_VBAS_info(cio, header->CSn_Id); |
| } |
| |
| /* ----------------- */ |
| /* VBAS : Msg_offset */ |
| /* ----------------- */ |
| header->Msg_offset = jpt_read_VBAS_info(cio, header->Msg_offset); |
| |
| /* ----------------- */ |
| /* VBAS : Msg_length */ |
| /* ----------------- */ |
| header->Msg_length = jpt_read_VBAS_info(cio, header->Msg_length); |
| |
| /* ---------- */ |
| /* VBAS : Aux */ |
| /* ---------- */ |
| if ((header->Class_Id & 0x01) == 1) { |
| header->Layer_nb = 0; |
| header->Layer_nb = jpt_read_VBAS_info(cio, header->Layer_nb); |
| } |
| } |