jpc_dec.h

在x86平台上运行不可信任代码的sandbox。

/*
 * Copyright (c) 1999-2000 Image Power, Inc. and the University of
 *   British Columbia.
 * Copyright (c) 2001-2002 Michael David Adams.
 * All rights reserved.
 */

/* __START_OF_JASPER_LICENSE__
 * 
 * JasPer License Version 2.0
 * 
 * Copyright (c) 1999-2000 Image Power, Inc.
 * Copyright (c) 1999-2000 The University of British Columbia
 * Copyright (c) 2001-2003 Michael David Adams
 * 
 * All rights reserved.
 * 
 * Permission is hereby granted, free of charge, to any person (the
 * "User") obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge,
 * publish, distribute, and/or sell copies of the Software, and to permit
 * persons to whom the Software is furnished to do so, subject to the
 * following conditions:
 * 
 * 1.  The above copyright notices and this permission notice (which
 * includes the disclaimer below) shall be included in all copies or
 * substantial portions of the Software.
 * 
 * 2.  The name of a copyright holder shall not be used to endorse or
 * promote products derived from the Software without specific prior
 * written permission.
 * 
 * THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS
 * LICENSE.  NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER
 * THIS DISCLAIMER.  THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
 * "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.  IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
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 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.  NO ASSURANCES ARE
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 * THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH,
 * PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH
 * RISK ACTIVITIES").  THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY
 * EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.
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 * __END_OF_JASPER_LICENSE__
 */

/*
 * JPEG-2000 Decoder
 *
 * $Id: jpc_dec.h 1918 2005-07-24 14:12:08Z baford $
 */

#ifndef JPC_DEC_H
#define JPC_DEC_H

/******************************************************************************\
* Includes.
\******************************************************************************/

#include "jasper/jas_stream.h"

#include "jpc_tsfb.h"
#include "jpc_bs.h"
#include "jpc_tagtree.h"
#include "jpc_cs.h"
#include "jpc_cod.h"
#include "jpc_mqdec.h"
#include "jpc_t2cod.h"

/******************************************************************************\
* Below are some ugly warts necessary to support packed packet headers.
\******************************************************************************/

/* PPM/PPT marker segment table entry. */

typedef struct {

	/* The index for this entry. */
	uint_fast16_t ind;

	/* The data length. */
	uint_fast32_t len;

	/* The data. */
	uchar *data;

} jpc_ppxstabent_t;

/* PPM/PPT marker segment table. */

typedef struct {

	/* The number of entries. */
	int numents;

	/* The maximum number of entries (i.e., the allocated size of the array
	  below). */
	int maxents;

	/* The table entries. */
	jpc_ppxstabent_t **ents;

} jpc_ppxstab_t;

/* Stream list class. */

typedef struct {

	/* The number of streams in this list. */
	int numstreams;

	/* The maximum number of streams that can be accomodated without
	  growing the streams array. */
	int maxstreams;

	/* The streams. */
	jas_stream_t **streams;

} jpc_streamlist_t;

/******************************************************************************\
* Coding parameters class.
\******************************************************************************/

/* Per-component coding parameters. */

typedef struct {

	/* How were various coding parameters set? */
	int flags;

	/* Per-component coding style parameters (e.g., explicit precinct sizes) */
	uint_fast8_t csty;

	/* The number of resolution levels. */
	uint_fast8_t numrlvls;

	/* The code block width exponent. */
	uint_fast8_t cblkwidthexpn;

	/* The code block height exponent. */
	uint_fast8_t cblkheightexpn;

	/* The QMFB ID. */
	uint_fast8_t qmfbid;

	/* The quantization style. */
	uint_fast8_t qsty;

	/* The number of quantizer step sizes. */
	uint_fast16_t numstepsizes;

	/* The step sizes. */
	uint_fast16_t stepsizes[3 * JPC_MAXRLVLS + 1];

	/* The number of guard bits. */
	uint_fast8_t numguardbits;

	/* The ROI shift value. */
	uint_fast8_t roishift;

	/* The code block parameters. */
	uint_fast8_t cblkctx;

	/* The precinct width exponents. */
	uint_fast8_t prcwidthexpns[JPC_MAXRLVLS];

	/* The precinct height exponents. */
	uint_fast8_t prcheightexpns[JPC_MAXRLVLS];

} jpc_dec_ccp_t;

/* Coding paramters. */

typedef struct {

	/* How were these coding parameters set? */
	int flags;

	/* Progression change list. */
	jpc_pchglist_t *pchglist;

	/* Progression order. */
	uint_fast8_t prgord;

	/* The number of layers. */
	uint_fast16_t numlyrs;

	/* The MCT ID. */
	uint_fast8_t mctid;

	/* The coding style parameters (e.g., SOP, EPH). */
	uint_fast8_t csty;

	/* The number of components. */
	int numcomps;

	/* The per-component coding parameters. */
	jpc_dec_ccp_t *ccps;

} jpc_dec_cp_t;

/******************************************************************************\
* Decoder class.
\******************************************************************************/

/* Decoder per-segment state information. */

typedef struct jpc_dec_seg_s {

	/* The next segment in the list. */
	struct jpc_dec_seg_s *next;

	/* The previous segment in the list. */
	struct jpc_dec_seg_s *prev;

	/* The starting pass number for this segment. */
	int passno;

	/* The number of passes in this segment. */
	int numpasses;

	/* The maximum number of passes in this segment. */
	int maxpasses;

	/* The type of data in this segment (i.e., MQ or raw). */
	int type;

	/* A stream containing the data for this segment. */
	jas_stream_t *stream;

	/* The number of bytes destined for this segment from the packet
	  currently being decoded. */
	int cnt;

	/* A flag indicating if this segment has been terminated. */
	int complete;

	/* The layer number to which this segment belongs. */
	/* If the segment spans multiple layers, then the largest layer number
	  spanned by the segment is used. */
	int lyrno;

} jpc_dec_seg_t;

/* Decoder segment list. */

typedef struct {

	/* The first entry in the list. */
	jpc_dec_seg_t *head;

	/* The last entry in the list. */
	jpc_dec_seg_t *tail;

} jpc_dec_seglist_t;

/* Decoder per-code-block state information. */

typedef struct {

	/* The number of passes. */
	int numpasses;

	/* A list of segments that still need to be decoded. */
	jpc_dec_seglist_t segs;

	/* The first incomplete/partial segment. */
	jpc_dec_seg_t *curseg;

	/* The number of leading insignificant bit planes for this code block. */
	int numimsbs;

	/* The number of bits used to encode pass data lengths. */
	int numlenbits;

	/* The first pass number containing data for this code block. */
	int firstpassno;

	/* The MQ decoder. */
	jpc_mqdec_t *mqdec;

	/* The raw bit stream decoder. */
	jpc_bitstream_t *nulldec;

	/* The per-sample state information for this code block. */
	jas_matrix_t *flags;

	/* The sample data associated with this code block. */
	jas_matrix_t *data;

} jpc_dec_cblk_t;

/* Decoder per-code-block-group state information. */

typedef struct {

	/* The x-coordinate of the top-left corner of the precinct. */
	uint_fast32_t xstart;

	/* The y-coordinate of the top-left corner of the precinct. */
	uint_fast32_t ystart;

	/* The x-coordinate of the bottom-right corner of the precinct
	  (plus one). */
	uint_fast32_t xend;

	/* The y-coordinate of the bottom-right corner of the precinct
	  (plus one). */
	uint_fast32_t yend;

	/* The number of code blocks spanning this precinct in the horizontal
	  direction. */
	int numhcblks;

	/* The number of code blocks spanning this precinct in the vertical
	  direction. */
	int numvcblks;

	/* The total number of code blocks in this precinct. */
	int numcblks;

	/* The per code block information. */
	jpc_dec_cblk_t *cblks;

	/* The inclusion tag tree. */
	jpc_tagtree_t *incltagtree;

	/* The insignificant MSBs tag tree. */
	jpc_tagtree_t *numimsbstagtree;

} jpc_dec_prc_t;