path: root/libopenjpeg/t2.c

/*
 * Copyright (c) 2001-2002, David Janssens
 * Copyright (c) 2002-2003, Yannick Verschueren
 * Copyright (c) 2002-2003,  Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
 * 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 "t2.h"
#include "tcd.h"
#include "bio.h"
#include "j2k.h"
#include "pi.h"
#include "tgt.h"
#include "int.h"
#include "cio.h"
#include <stdio.h>
#include <setjmp.h>
#include <string.h>
#include <stdlib.h>

#define RESTART 0x04

extern jmp_buf j2k_error;

void t2_putcommacode(int n)
{
	while (--n >= 0) {
		bio_write(1, 1);
	}
	bio_write(0, 1);
}

int t2_getcommacode()
{
	int n;
	for (n = 0; bio_read(1); n++) {
	}
	return n;
}

/* <summary> */
/* Variable length code for signalling delta Zil (truncation point) */
/* <val> n : delta Zil */
/* <\summary> */
void t2_putnumpasses(int n)
{
	if (n == 1) {
		bio_write(0, 1);
	} else if (n == 2) {
		bio_write(2, 2);
	} else if (n <= 5) {
		bio_write(0xc | (n - 3), 4);
	} else if (n <= 36) {
		bio_write(0x1e0 | (n - 6), 9);
	} else if (n <= 164) {
		bio_write(0xff80 | (n - 37), 16);
	}
}

int t2_getnumpasses()
{
	int n;
	if (!bio_read(1))
		return 1;
	if (!bio_read(1))
		return 2;
	if ((n = bio_read(2)) != 3)
		return 3 + n;
	if ((n = bio_read(5)) != 31)
		return 6 + n;
	return 37 + bio_read(7);
}

int t2_encode_packet(tcd_tile_t * tile, j2k_tcp_t * tcp, int compno,
										 int resno, int precno, int layno, unsigned char *dest,
										 int len, info_image * info_IM, int tileno)
{
	int bandno, cblkno;
	unsigned char *sop = 0, *eph = 0;
	tcd_tilecomp_t *tilec = &tile->comps[compno];
	tcd_resolution_t *res = &tilec->resolutions[resno];
	unsigned char *c = dest;

	/* int PPT=tile->PPT, ppt_len=0; */
	/* FILE *PPT_file; */

	/* <SOP 0xff91> */
	if (tcp->csty & J2K_CP_CSTY_SOP) {
		sop = (unsigned char *) malloc(6 * sizeof(unsigned char));
		sop[0] = 255;
		sop[1] = 145;
		sop[2] = 0;
		sop[3] = 4;
		sop[4] = (info_IM->num % 65536) / 256;
		sop[5] = (info_IM->num % 65536) % 256;
		memcpy(c, sop, 6);
		free(sop);
		c += 6;
	}
	/* </SOP> */

	if (!layno) {
		for (bandno = 0; bandno < res->numbands; bandno++) {
			tcd_band_t *band = &res->bands[bandno];
			tcd_precinct_t *prc = &band->precincts[precno];
			tgt_reset(prc->incltree);
			tgt_reset(prc->imsbtree);
			for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
				tcd_cblk_t *cblk = &prc->cblks[cblkno];
				cblk->numpasses = 0;
				tgt_setvalue(prc->imsbtree, cblkno, band->numbps - cblk->numbps);
			}
		}
	}

	bio_init_enc(c, len);
	bio_write(1, 1);							/* Empty header bit */

	/* Writing Packet header */
	for (bandno = 0; bandno < res->numbands; bandno++) {
		tcd_band_t *band = &res->bands[bandno];
		tcd_precinct_t *prc = &band->precincts[precno];
		for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
			tcd_cblk_t *cblk = &prc->cblks[cblkno];
			tcd_layer_t *layer = &cblk->layers[layno];
			if (!cblk->numpasses && layer->numpasses) {
				tgt_setvalue(prc->incltree, cblkno, layno);
			}
		}
		for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
			tcd_cblk_t *cblk = &prc->cblks[cblkno];
			tcd_layer_t *layer = &cblk->layers[layno];
			int increment = 0;
			int nump = 0;
			int len = 0, passno;
			/* cblk inclusion bits */
			if (!cblk->numpasses) {
				tgt_encode(prc->incltree, cblkno, layno + 1);
			} else {
				bio_write(layer->numpasses != 0, 1);
			}
			/* if cblk not included, go to the next cblk  */
			if (!layer->numpasses) {
				continue;
			}
			/* if first instance of cblk --> zero bit-planes information */
			if (!cblk->numpasses) {
				cblk->numlenbits = 3;
				tgt_encode(prc->imsbtree, cblkno, 999);
			}
			/* number of coding passes included */
			t2_putnumpasses(layer->numpasses);

			/* computation of the increase of the length indicator and insertion in the header     */
			for (passno = cblk->numpasses;
					 passno < cblk->numpasses + layer->numpasses; passno++) {
				tcd_pass_t *pass = &cblk->passes[passno];
				nump++;
				len += pass->len;
				if (pass->term
						|| passno == (cblk->numpasses + layer->numpasses) - 1) {
					increment =
						int_max(increment,
										int_floorlog2(len) + 1 - (cblk->numlenbits +
																							int_floorlog2(nump)));
					len = 0;
					nump = 0;
				}
			}
			t2_putcommacode(increment);
			/* computation of the new Length indicator */
			cblk->numlenbits += increment;
			/* insertion of the codeword segment length */

			for (passno = cblk->numpasses;
					 passno < cblk->numpasses + layer->numpasses; passno++) {
				tcd_pass_t *pass = &cblk->passes[passno];
				nump++;
				len += pass->len;
				if (pass->term
						|| passno == (cblk->numpasses + layer->numpasses) - 1) {
					bio_write(len, cblk->numlenbits + int_floorlog2(nump));
					len = 0;
					nump = 0;
				}
			}
		}
	}

	if (bio_flush())
		return -999;								/* modified to eliminate longjmp !! */

	c += bio_numbytes();

	/* <EPH 0xff92> */
	if (tcp->csty & J2K_CP_CSTY_EPH) {
		eph = (unsigned char *) malloc(2 * sizeof(unsigned char));
		eph[0] = 255;
		eph[1] = 146;
		memcpy(c, eph, 2);
		free(eph);
		c += 2;
	}
	/* </EPH> */
	/*   } */
	/* Writing the packet body */

	for (bandno = 0; bandno < res->numbands; bandno++) {
		tcd_band_t *band = &res->bands[bandno];
		tcd_precinct_t *prc = &band->precincts[precno];
		for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
			tcd_cblk_t *cblk = &prc->cblks[cblkno];
			tcd_layer_t *layer = &cblk->layers[layno];
			if (!layer->numpasses) {	/* ADD for index Cfr. Marcela --> delta disto by packet */
				if (info_IM->index_write && info_IM->index_on) {
					info_tile *info_TL = &info_IM->tile[tileno];
					info_packet *info_PK = &info_TL->packet[info_IM->num];
					info_PK->disto = layer->disto;
					if (info_IM->D_max < info_PK->disto)
						info_IM->D_max = info_PK->disto;
				}												/* </ADD> */
				continue;
			}
			if (c + layer->len > dest + len) {
				return -999;
			}

			memcpy(c, layer->data, layer->len);
			cblk->numpasses += layer->numpasses;
			c += layer->len;
			/* ADD for index Cfr. Marcela --> delta disto by packet */
			if (info_IM->index_write && info_IM->index_on) {
				info_tile *info_TL = &info_IM->tile[tileno];
				info_packet *info_PK = &info_TL->packet[info_IM->num];
				info_PK->disto = layer->disto;
				if (info_IM->D_max < info_PK->disto)
					info_IM->D_max = info_PK->disto;
			}													/* </ADD> */
		}
	}
	return c - dest;
}

void t2_init_seg(tcd_seg_t * seg, int cblksty, int first)
{
	seg->numpasses = 0;
	seg->len = 0;
	if (cblksty & J2K_CCP_CBLKSTY_TERMALL)
		seg->maxpasses = 1;
	else if (cblksty & J2K_CCP_CBLKSTY_LAZY) {
		if (first)
			seg->maxpasses = 10;
		else
			seg->maxpasses = (((seg - 1)->maxpasses == 1)
												|| ((seg - 1)->maxpasses == 10)) ? 2 : 1;
	} else
		seg->maxpasses = 109;
}

int t2_decode_packet(unsigned char *src, int len, tcd_tile_t * tile,
										 j2k_tcp_t * tcp, int compno, int resno, int precno,
										 int layno)
{
	int bandno, cblkno;
	tcd_tilecomp_t *tilec = &tile->comps[compno];
	tcd_resolution_t *res = &tilec->resolutions[resno];
	unsigned char *c = src;
	int present;

	if (layno == 0) {
		for (bandno = 0; bandno < res->numbands; bandno++) {
			tcd_band_t *band = &res->bands[bandno];
			tcd_precinct_t *prc = &band->precincts[precno];
			tgt_reset(prc->incltree);
			tgt_reset(prc->imsbtree);
			for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
				tcd_cblk_t *cblk = &prc->cblks[cblkno];
				cblk->numsegs = 0;
			}
		}
	}

	if (tcp->csty & J2K_CP_CSTY_SOP) {
		c += 6;
	}
	bio_init_dec(c, src + len - c);
	present = bio_read(1);
	if (!present) {
		bio_inalign();
		c += bio_numbytes();
		return c - src;
	}
	for (bandno = 0; bandno < res->numbands; bandno++) {
		tcd_band_t *band = &res->bands[bandno];
		tcd_precinct_t *prc = &band->precincts[precno];
		for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
			int included, increment, n;
			tcd_cblk_t *cblk = &prc->cblks[cblkno];
			tcd_seg_t *seg;
			/* if cblk not yet included before --> inclusion tagtree */
			if (!cblk->numsegs) {
				included = tgt_decode(prc->incltree, cblkno, layno + 1);
				/* else one bit */
			} else {
				included = bio_read(1);
			}
			/* if cblk not included */
			if (!included) {
				cblk->numnewpasses = 0;
				continue;
			}
			/* if cblk not yet included --> zero-bitplane tagtree */
			if (!cblk->numsegs) {
				int i, numimsbs;
				for (i = 0; !tgt_decode(prc->imsbtree, cblkno, i); i++) {
				}
				numimsbs = i - 1;
				cblk->numbps = band->numbps - numimsbs;
				cblk->numlenbits = 3;
			}
			/* number of coding passes */
			cblk->numnewpasses = t2_getnumpasses();
			increment = t2_getcommacode();
			/* length indicator increment */
			cblk->numlenbits += increment;
			if (!cblk->numsegs) {
				seg = &cblk->segs[0];
				t2_init_seg(seg, tcp->tccps[compno].cblksty, 1);
			} else {
				seg = &cblk->segs[cblk->numsegs - 1];
				if (seg->numpasses == seg->maxpasses) {
					t2_init_seg(++seg, tcp->tccps[compno].cblksty, 0);
				}
			}
			n = cblk->numnewpasses;

			do {
				seg->numnewpasses = int_min(seg->maxpasses - seg->numpasses, n);
				seg->newlen =
					bio_read(cblk->numlenbits + int_floorlog2(seg->numnewpasses));
				n -= seg->numnewpasses;
				if (n > 0) {
					t2_init_seg(++seg, tcp->tccps[compno].cblksty, 0);
				}
			} while (n > 0);
		}
	}
	if (bio_inalign())
		return -999;
	c += bio_numbytes();
	if (tcp->csty & J2K_CP_CSTY_EPH) {
		c += 2;
	}
	for (bandno = 0; bandno < res->numbands; bandno++) {
		tcd_band_t *band = &res->bands[bandno];
		tcd_precinct_t *prc = &band->precincts[precno];
		for (cblkno = 0; cblkno < prc->cw * prc->ch; cblkno++) {
			tcd_cblk_t *cblk = &prc->cblks[cblkno];
			tcd_seg_t *seg;
			if (!cblk->numnewpasses)
				continue;
			if (!cblk->numsegs) {
				seg = &cblk->segs[cblk->numsegs++];
				cblk->len = 0;
			} else {
				seg = &cblk->segs[cblk->numsegs - 1];
				if (seg->numpasses == seg->maxpasses) {
					seg++;
					cblk->numsegs++;
				}
			}
			do {
				if (c + seg->newlen > src + len)
					return -999;
				memcpy(cblk->data + cblk->len, c, seg->newlen);
				if (seg->numpasses == 0) {
					seg->data = cblk->data + cblk->len;
				}
				c += seg->newlen;
				cblk->len += seg->newlen;
				seg->len += seg->newlen;
				seg->numpasses += seg->numnewpasses;
				cblk->numnewpasses -= seg->numnewpasses;
				if (cblk->numnewpasses > 0) {
					seg++;
					cblk->numsegs++;
				}
			} while (cblk->numnewpasses > 0);
		}
	}

	return c - src;
}

int t2_encode_packets(j2k_image_t * img, j2k_cp_t * cp, int tileno,
											tcd_tile_t * tile, int maxlayers,
											unsigned char *dest, int len, info_image * info_IM)
{
	unsigned char *c = dest;
	int e = 0;
	pi_iterator_t *pi;
	int pino, compno;

	pi = pi_create(img, cp, tileno);

	for (pino = 0; pino <= cp->tcps[tileno].numpocs; pino++) {
		while (pi_next(&pi[pino])) {
			if (pi[pino].layno < maxlayers) {
				e =
					t2_encode_packet(tile, &cp->tcps[tileno], pi[pino].compno,
													 pi[pino].resno, pi[pino].precno, pi[pino].layno,
													 c, dest + len - c, info_IM, tileno);
				if (e == -999) {
					break;
				} else
					c += e;
				/* INDEX >> */
				if (info_IM->index_write && info_IM->index_on) {
					info_tile *info_TL = &info_IM->tile[tileno];
					info_packet *info_PK = &info_TL->packet[info_IM->num];
					if (!info_IM->num) {
						info_PK->start_pos = info_TL->end_header + 1;
					} else {
						info_PK->start_pos =
							info_TL->packet[info_IM->num - 1].end_pos + 1;
					}
					info_PK->end_pos = info_PK->start_pos + e - 1;

				}
				/* << INDEX */
				if ((info_IM->index_write
						 && cp->tcps[tileno].csty & J2K_CP_CSTY_SOP)
						|| (info_IM->index_write && info_IM->index_on)) {
					info_IM->num++;
				}
			}

		}

		/* FREE space memory taken by pi */
		for (compno = 0; compno < pi[pino].numcomps; compno++) {
			free(pi[pino].comps[compno].resolutions);
		}
		free(pi[pino].comps);
	}
	free(pi);
	if (e == -999)
		return e;
	else
		return c - dest;
}

int t2_decode_packets(unsigned char *src, int len, j2k_image_t * img,
											j2k_cp_t * cp, int tileno, tcd_tile_t * tile)
{
	unsigned char *c = src;
	pi_iterator_t *pi;
	int pino, compno, e = 0;

	pi = pi_create(img, cp, tileno);

	for (pino = 0; pino <= cp->tcps[tileno].numpocs; pino++) {
		while (pi_next(&pi[pino])) {
			e =
				t2_decode_packet(c, src + len - c, tile, &cp->tcps[tileno],
												 pi[pino].compno, pi[pino].resno, pi[pino].precno,
												 pi[pino].layno);
			if (e == -999) {					/* ADD */
				break;
			} else
				c += e;
		}
		/* FREE space memory taken by pi */
		for (compno = 0; compno < pi[pino].numcomps; compno++) {
			free(pi[pino].comps[compno].resolutions);
		}
		free(pi[pino].comps);
	}
	free(pi);
	if (e == -999)
		return e;
	else
		return c - src;
}