mif_cod.c

自主研发的一种电子文档格式。也算是多年技术的积累吧。 系统主要包含虚拟驱动和浏览器

/*
 * Copyright (c) 2001-2002 Michael David Adams.
 * All rights reserved.
 */

/* __START_OF_JASPER_LICENSE__
 * 
 * JasPer License Version 2.0
 * 
 * Copyright (c) 2001-2006 Michael David Adams
 * Copyright (c) 1999-2000 Image Power, Inc.
 * Copyright (c) 1999-2000 The University of British Columbia
 * 
 * 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
 * INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.  NO ASSURANCES ARE
 * PROVIDED BY THE COPYRIGHT HOLDERS THAT THE SOFTWARE DOES NOT INFRINGE
 * THE PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER ENTITY.
 * EACH COPYRIGHT HOLDER DISCLAIMS ANY LIABILITY TO THE USER FOR CLAIMS
 * BROUGHT BY ANY OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL
 * PROPERTY RIGHTS OR OTHERWISE.  AS A CONDITION TO EXERCISING THE RIGHTS
 * GRANTED HEREUNDER, EACH USER HEREBY ASSUMES SOLE RESPONSIBILITY TO SECURE
 * ANY OTHER INTELLECTUAL PROPERTY RIGHTS NEEDED, IF ANY.  THE SOFTWARE
 * IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL
 * SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES,
 * AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL
 * SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH
 * 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.
 * 
 * __END_OF_JASPER_LICENSE__
 */

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

#include <assert.h>

#include "jasper/jas_tvp.h"
#include "jasper/jas_stream.h"
#include "jasper/jas_image.h"
#include "jasper/jas_string.h"
#include "jasper/jas_malloc.h"

#include "mif_cod.h"

/******************************************************************************\
* Local types.
\******************************************************************************/

typedef enum {
	MIF_END = 0,
	MIF_CMPT
} mif_tagid2_t;

typedef enum {
	MIF_TLX = 0,
	MIF_TLY,
	MIF_WIDTH,
	MIF_HEIGHT,
	MIF_HSAMP,
	MIF_VSAMP,
	MIF_PREC,
	MIF_SGND,
	MIF_DATA
} mif_tagid_t;

/******************************************************************************\
* Local functions.
\******************************************************************************/

static mif_hdr_t *mif_hdr_create(int maxcmpts);
static void mif_hdr_destroy(mif_hdr_t *hdr);
static int mif_hdr_growcmpts(mif_hdr_t *hdr, int maxcmpts);
static mif_hdr_t *mif_hdr_get(jas_stream_t *in);
static int mif_process_cmpt(mif_hdr_t *hdr, char *buf);
static int mif_hdr_put(mif_hdr_t *hdr, jas_stream_t *out);
static int mif_hdr_addcmpt(mif_hdr_t *hdr, int cmptno, mif_cmpt_t *cmpt);
static mif_cmpt_t *mif_cmpt_create(void);
static void mif_cmpt_destroy(mif_cmpt_t *cmpt);
static char *mif_getline(jas_stream_t *jas_stream, char *buf, int bufsize);
static int mif_getc(jas_stream_t *in);
static mif_hdr_t *mif_makehdrfromimage(jas_image_t *image);

/******************************************************************************\
* Local data.
\******************************************************************************/

jas_taginfo_t mif_tags2[] = {
	{MIF_CMPT, "component"},
	{MIF_END, "end"},
	{-1, 0}
};

jas_taginfo_t mif_tags[] = {
	{MIF_TLX, "tlx"},
	{MIF_TLY, "tly"},
	{MIF_WIDTH, "width"},
	{MIF_HEIGHT, "height"},
	{MIF_HSAMP, "sampperx"},
	{MIF_VSAMP, "samppery"},
	{MIF_PREC, "prec"},
	{MIF_SGND, "sgnd"},
	{MIF_DATA, "data"},
	{-1, 0}
};

/******************************************************************************\
* Code for load operation.
\******************************************************************************/

/* Load an image from a stream in the MIF format. */

jas_image_t *mif_decode(jas_stream_t *in, char *optstr)
{
	mif_hdr_t *hdr;
	jas_image_t *image;
	jas_image_t *tmpimage;
	jas_stream_t *tmpstream;
	int cmptno;
	mif_cmpt_t *cmpt;
	jas_image_cmptparm_t cmptparm;
	jas_seq2d_t *data;
	int_fast32_t x;
	int_fast32_t y;
	int bias;

	/* Avoid warnings about unused parameters. */
	optstr = 0;

	hdr = 0;
	image = 0;
	tmpimage = 0;
	tmpstream = 0;
	data = 0;

	if (!(hdr = mif_hdr_get(in))) {
		goto error;
	}

	if (!(image = jas_image_create0())) {
		goto error;
	}

	for (cmptno = 0; cmptno < hdr->numcmpts; ++cmptno) {
		cmpt = hdr->cmpts[cmptno];
		tmpstream = cmpt->data ? jas_stream_fopen(cmpt->data, "rb") : in;
		if (!tmpstream) {
			goto error;
		}
		if (!(tmpimage = jas_image_decode(tmpstream, -1, 0))) {
			goto error;
		}
		if (tmpstream != in) {
			jas_stream_close(tmpstream);
			tmpstream = 0;
		}
		if (!cmpt->width) {
			cmpt->width = jas_image_cmptwidth(tmpimage, 0);
		}
		if (!cmpt->height) {
			cmpt->height = jas_image_cmptwidth(tmpimage, 0);
		}
		if (!cmpt->prec) {
			cmpt->prec = jas_image_cmptprec(tmpimage, 0);
		}
		if (cmpt->sgnd < 0) {
			cmpt->sgnd = jas_image_cmptsgnd(tmpimage, 0);
		}
		cmptparm.tlx = cmpt->tlx;
		cmptparm.tly = cmpt->tly;
		cmptparm.hstep = cmpt->sampperx;
		cmptparm.vstep = cmpt->samppery;
		cmptparm.width = cmpt->width;
		cmptparm.height = cmpt->height;
		cmptparm.prec = cmpt->prec;
		cmptparm.sgnd = cmpt->sgnd;
		if (jas_image_addcmpt(image, jas_image_numcmpts(image), &cmptparm)) {
			goto error;
		}
		if (!(data = jas_seq2d_create(0, 0, cmpt->width, cmpt->height))) {
			goto error;
		}
		if (jas_image_readcmpt(tmpimage, 0, 0, 0, cmpt->width, cmpt->height,
		  data)) {
			goto error;
		}
		if (cmpt->sgnd) {
			bias = 1 << (cmpt->prec - 1);
			for (y = 0; y < cmpt->height; ++y) {
				for (x = 0; x < cmpt->width; ++x) {
					*jas_seq2d_getref(data, x, y) -= bias;
				}
			}
		}
		if (jas_image_writecmpt(image, jas_image_numcmpts(image) - 1, 0, 0,
		  cmpt->width, cmpt->height, data)) {
			goto error;
		}
		jas_seq2d_destroy(data);
		data = 0;
		jas_image_destroy(tmpimage);
		tmpimage = 0;
	}

	mif_hdr_destroy(hdr);
	hdr = 0;
	return image;

error:
	if (image) {
		jas_image_destroy(image);
	}
	if (hdr) {
		mif_hdr_destroy(hdr);
	}
	if (tmpstream && tmpstream != in) {
		jas_stream_close(tmpstream);
	}
	if (tmpimage) {
		jas_image_destroy(tmpimage);
	}
	if (data) {
		jas_seq2d_destroy(data);
	}
	return 0;
}

/******************************************************************************\
* Code for save operation.
\******************************************************************************/

/* Save an image to a stream in the the MIF format. */

int mif_encode(jas_image_t *image, jas_stream_t *out, char *optstr)
{
	mif_hdr_t *hdr;
	jas_image_t *tmpimage;
	int fmt;
	int cmptno;
	mif_cmpt_t *cmpt;
	jas_image_cmptparm_t cmptparm;
	jas_seq2d_t *data;
	int_fast32_t x;
	int_fast32_t y;
	int bias;

	hdr = 0;
	tmpimage = 0;
	data = 0;

	if (optstr && *optstr != '\0') {
		jas_eprintf("warning: ignoring unsupported options\n");
	}

	if ((fmt = jas_image_strtofmt("pnm")) < 0) {
		jas_eprintf("error: PNM support required\n");
		goto error;
	}

	if (!(hdr = mif_makehdrfromimage(image))) {
		goto error;
	}
	if (mif_hdr_put(hdr, out)) {
		goto error;
	}

	/* Output component data. */
	for (cmptno = 0; cmptno < hdr->numcmpts; ++cmptno) {
		cmpt = hdr->cmpts[cmptno];
		if (!cmpt->data) {
			if (!(tmpimage = jas_image_create0())) {
				goto error;
			}	
			cmptparm.tlx = 0;
			cmptparm.tly = 0;
			cmptparm.hstep = cmpt->sampperx;
			cmptparm.vstep = cmpt->samppery;
			cmptparm.width = cmpt->width;
			cmptparm.height = cmpt->height;
			cmptparm.prec = cmpt->prec;
			cmptparm.sgnd = false;
			if (jas_image_addcmpt(tmpimage, jas_image_numcmpts(tmpimage), &cmptparm)) {
				goto error;
			}
			if (!(data = jas_seq2d_create(0, 0, cmpt->width, cmpt->height))) {
				goto error;
			}
			if (jas_image_readcmpt(image, cmptno, 0, 0, cmpt->width, cmpt->height,
			  data)) {
				goto error;
			}
			if (cmpt->sgnd) {
				bias = 1 << (cmpt->prec - 1);
				for (y = 0; y < cmpt->height; ++y) {
					for (x = 0; x < cmpt->width; ++x) {
						*jas_seq2d_getref(data, x, y) += bias;
					}
				}
			}
			if (jas_image_writecmpt(tmpimage, 0, 0, 0, cmpt->width, cmpt->height,
			  data)) {
				goto error;
			}
			jas_seq2d_destroy(data);
			data = 0;
			if (jas_image_encode(tmpimage, out, fmt, 0)) {
				goto error;
			}
			jas_image_destroy(tmpimage);
			tmpimage = 0;
		}
	}

	mif_hdr_destroy(hdr);

	return 0;

error:
	if (hdr) {
		mif_hdr_destroy(hdr);
	}
	if (tmpimage) {
		jas_image_destroy(tmpimage);
	}
	if (data) {
		jas_seq2d_destroy(data);
	}
	return -1;
}

/******************************************************************************\
* Code for validate operation.
\******************************************************************************/

int mif_validate(jas_stream_t *in)
{
	uchar buf[MIF_MAGICLEN];
	uint_fast32_t magic;
	int i;
	int n;

	assert(JAS_STREAM_MAXPUTBACK >= MIF_MAGICLEN);

	/* Read the validation data (i.e., the data used for detecting
	  the format). */
	if ((n = jas_stream_read(in, buf, MIF_MAGICLEN)) < 0) {