src/util/cmatrix.c

#ifndef lint
static const char RCSid[] = "$Id: cmatrix.c,v 2.28 2020/03/30 20:41:47 greg Exp $";
#endif
/*
 * Color matrix routines.
 *
 *      G. Ward
 */

#include <ctype.h>
#include "platform.h"
#include "standard.h"
#include "cmatrix.h"
#include "platform.h"
#include "paths.h"
#include "resolu.h"

const char      *cm_fmt_id[] = {
                        "unknown", COLRFMT, CIEFMT,
                        "float", "ascii", "double"
                };

const int       cm_elem_size[] = {
                        0, 4, 4, 3*sizeof(float), 0, 3*sizeof(double)
                };

/* Allocate a color coefficient matrix */
CMATRIX *
cm_alloc(int nrows, int ncols)
{
        CMATRIX *cm;

        if ((nrows <= 0) | (ncols <= 0))
                error(USER, "attempt to create empty matrix");
        cm = (CMATRIX *)malloc(sizeof(CMATRIX) +
                                sizeof(COLOR)*((size_t)nrows*ncols - 1));
        if (!cm)
                error(SYSTEM, "out of memory in cm_alloc()");
        cm->nrows = nrows;
        cm->ncols = ncols;
        return(cm);
}

static void
adjacent_ra_sizes(size_t bounds[2], size_t target)
{
        bounds[0] = 0; bounds[1] = 2048;
        while (bounds[1] < target) {
                bounds[0] = bounds[1];
                bounds[1] += bounds[1]>>1;
        }
}

/* Resize color coefficient matrix */
CMATRIX *
cm_resize(CMATRIX *cm, int nrows)
{
        size_t  old_size, new_size, ra_bounds[2];

        if (!cm)
                return(NULL);
        if (nrows == cm->nrows)
                return(cm);
        if (nrows <= 0) {
                cm_free(cm);
                return(NULL);
        }
        old_size = sizeof(CMATRIX) + sizeof(COLOR)*(cm->nrows*cm->ncols - 1);
        adjacent_ra_sizes(ra_bounds, old_size);
        new_size = sizeof(CMATRIX) + sizeof(COLOR)*(nrows*cm->ncols - 1);
        if (nrows < cm->nrows ? new_size <= ra_bounds[0] :
                                new_size > ra_bounds[1]) {
                adjacent_ra_sizes(ra_bounds, new_size);
                cm = (CMATRIX *)realloc(cm, ra_bounds[1]);
                if (!cm)
                        error(SYSTEM, "out of memory in cm_resize()");
        }
        cm->nrows = nrows;
        return(cm);
}

typedef struct {
        int     dtype;          /* data type */
        int     need2swap;      /* need byte swap? */
        int     nrows, ncols;   /* matrix size */
        COLOR   expos;          /* exposure value */
        char    *err;           /* error message */
} CMINFO;               /* header info record */

static int
get_cminfo(char *s, void *p)
{
        CMINFO  *ip = (CMINFO *)p;
        char    fmt[MAXFMTLEN];
        int     i;

        if (!strncmp(s, "NCOMP=", 6) && atoi(s+6) != 3) {
                ip->err = "unexpected # components (must be 3)";
                return(-1);
        }
        if (!strncmp(s, "NROWS=", 6)) {
                ip->nrows = atoi(s+6);
                return(0);
        }
        if (!strncmp(s, "NCOLS=", 6)) {
                ip->ncols = atoi(s+6);
                return(0);
        }
        if ((i = isbigendian(s)) >= 0) {
                ip->need2swap = (nativebigendian() != i);
                return(0);
        }
        if (isexpos(s)) {
                double  d = exposval(s);
                scalecolor(ip->expos, d);
                return(0);
        }
        if (iscolcor(s)) {
                COLOR   ctmp;
                colcorval(ctmp, s);
                multcolor(ip->expos, ctmp);
                return(0);
        }
        if (!formatval(fmt, s))
                return(0);
        for (i = 1; i < DTend; i++)
                if (!strcmp(fmt, cm_fmt_id[i]))
                        ip->dtype = i;
        return(0);
}

/* Load header to obtain/check data type and number of columns */
char *
cm_getheader(int *dt, int *nr, int *nc, int *swp, COLOR scale, FILE *fp)
{
        CMINFO  cmi;
                                                /* read header */
        cmi.dtype = DTfromHeader;
        cmi.need2swap = 0;
        cmi.expos[0] = cmi.expos[1] = cmi.expos[2] = 1.f;
        cmi.nrows = cmi.ncols = 0;
        cmi.err = "unexpected EOF in header";
        if (getheader(fp, get_cminfo, &cmi) < 0)
                return(cmi.err);
        if (dt) {                               /* get/check data type? */
                if (cmi.dtype == DTfromHeader) {
                        if (*dt == DTfromHeader)
                                return("missing/unknown data format in header");
                } else if (*dt == DTfromHeader)
                        *dt = cmi.dtype;
                else if (*dt != cmi.dtype)
                        return("unexpected data format in header");
        }
        if (nr) {                               /* get/check #rows? */
                if (*nr <= 0)
                        *nr = cmi.nrows;
                else if ((cmi.nrows > 0) & (*nr != cmi.nrows))
                        return("unexpected row count in header");
        }
        if (nc) {                               /* get/check #columns? */
                if (*nc <= 0)
                        *nc = cmi.ncols;
                else if ((cmi.ncols > 0) & (*nc != cmi.ncols))
                        return("unexpected column count in header");
        }
        if (swp)                                /* get/check swap? */
                *swp = cmi.need2swap;
        if (scale) {                            /* transfer exposure comp. */
                scale[0] = 1.f/cmi.expos[0];
                scale[1] = 1.f/cmi.expos[1];
                scale[2] = 1.f/cmi.expos[2];
        }
        return(NULL);
}

/* Allocate and load image data into matrix */
static CMATRIX *
cm_load_rgbe(FILE *fp, int nrows, int ncols, COLOR scale)
{
        int     doscale;
        CMATRIX *cm;
        COLORV  *mp;
                                                /* header already loaded */
        cm = cm_alloc(nrows, ncols);
        if (!cm)
                return(NULL);
        doscale = (scale[0] < .99) | (scale[0] > 1.01) |
                        (scale[1] < .99) | (scale[1] > 1.01) |
                        (scale[2] < .99) | (scale[2] > 1.01) ;
        mp = cm->cmem;
        while (nrows--) {
                if (freadscan((COLOR *)mp, ncols, fp) < 0) {
                        error(USER, "error reading color picture as matrix");
                        cm_free(cm);
                        return(NULL);
                }
                if (doscale) {
                        int     i = ncols;
                        while (i--) {
                                *mp++ *= scale[0];
                                *mp++ *= scale[1];
                                *mp++ *= scale[2];
                        }
                } else
                        mp += 3*ncols;
        }                                       /* caller closes stream */
        return(cm);
}

/* Allocate and load a matrix from the given input (or stdin if NULL) */
CMATRIX *
cm_load(const char *inspec, int nrows, int ncols, int dtype)
{
        const int       ROWINC = 2048;
        FILE            *fp = stdin;
        int             swap = 0;
        COLOR           scale;
        CMATRIX         *cm;

        if (!inspec)
                inspec = "<stdin>";
        else if (inspec[0] == '!') {
                fp = popen(inspec+1, "r");
                if (!fp) {
                        sprintf(errmsg, "cannot start command '%s'", inspec);
                        error(SYSTEM, errmsg);
                }
        } else if (!(fp = fopen(inspec, "r"))) {
                sprintf(errmsg, "cannot open file '%s'", inspec);
                error(SYSTEM, errmsg);
        }
#ifdef getc_unlocked
        flockfile(fp);
#endif
        if (dtype != DTascii)
                SET_FILE_BINARY(fp);            /* doesn't really work */
        if (!dtype | !ncols) {                  /* expecting header? */
                char    *err = cm_getheader(&dtype, &nrows, &ncols, &swap, scale, fp);
                if (err)
                        error(USER, err);
        }
        if (ncols <= 0 && !fscnresolu(&ncols, &nrows, fp))
                error(USER, "unspecified number of columns");
        switch (dtype) {
        case DTascii:
        case DTfloat:
        case DTdouble:
                break;
        case DTrgbe:
        case DTxyze:
                cm = cm_load_rgbe(fp, nrows, ncols, scale);
                goto cleanup;
        default:
                error(USER, "unexpected data type in cm_load()");
        }
        if (nrows <= 0) {                       /* don't know length? */
                int     guessrows = 147;        /* usually big enough */
                if (cm_elem_size[dtype] && (fp != stdin) & (inspec[0] != '!')) {
                        long    startpos = ftell(fp);
                        if (fseek(fp, 0L, SEEK_END) == 0) {
                                long    rowsiz = (long)ncols*cm_elem_size[dtype];
                                long    endpos = ftell(fp);

                                if ((endpos - startpos) % rowsiz) {
                                        sprintf(errmsg,
                                        "improper length for binary file '%s'",
                                                        inspec);
                                        error(USER, errmsg);
                                }
                                guessrows = (endpos - startpos)/rowsiz;
                                if (fseek(fp, startpos, SEEK_SET) < 0) {
                                        sprintf(errmsg,
                                                "fseek() error on file '%s'",
                                                        inspec);
                                        error(SYSTEM, errmsg);
                                }
                                nrows = guessrows;      /* we're confident */
                        }
                }
                cm = cm_alloc(guessrows, ncols);
        } else
                cm = cm_alloc(nrows, ncols);
        if (!cm)                                        /* XXX never happens */
                return(NULL);
        if (dtype == DTascii) {                         /* read text file */
                int     maxrow = (nrows > 0 ? nrows : 32000);
                int     r, c;
                for (r = 0; r < maxrow; r++) {
                    if (r >= cm->nrows)                 /* need more space? */
                        cm = cm_resize(cm, cm->nrows+ROWINC);
                    for (c = 0; c < ncols; c++) {
                        COLORV  *cv = cm_lval(cm,r,c);
                        if (fscanf(fp, COLSPEC, cv, cv+1, cv+2) != 3) {
                                if ((nrows <= 0) & (r > 0) & !c) {
                                        cm = cm_resize(cm, maxrow=r);
                                        break;
                                } else
                                        goto EOFerror;
                        }
                    }
                }
                while ((c = getc(fp)) != EOF)
                        if (!isspace(c)) {
                                sprintf(errmsg,
                                "unexpected data at end of ascii input '%s'",
                                                inspec);
                                error(WARNING, errmsg);
                                break;
                        }
        } else {                                        /* read binary file */
                if (sizeof(COLOR) == cm_elem_size[dtype]) {
                        int     nread = 0;
                        do {                            /* read all we can */
                                nread += getbinary(cm->cmem + 3*nread,
                                                sizeof(COLOR),
                                                cm->nrows*cm->ncols - nread,
                                                fp);
                                if (nrows <= 0) {       /* unknown length */
                                        if (nread == cm->nrows*cm->ncols)
                                                        /* need more space? */
                                                cm = cm_resize(cm, cm->nrows+ROWINC);
                                        else if (nread && !(nread % cm->ncols))
                                                        /* seem to be  done */
                                                cm = cm_resize(cm, nread/cm->ncols);
                                        else            /* ended mid-row */
                                                goto EOFerror;
                                } else if (nread < cm->nrows*cm->ncols)
                                        goto EOFerror;
                        } while (nread < cm->nrows*cm->ncols);

                        if (swap) {
                                if (sizeof(COLORV) == 4)
                                        swap32((char *)cm->cmem,
                                                        3*cm->nrows*cm->ncols);
                                else /* sizeof(COLORV) == 8 */
                                        swap64((char *)cm->cmem,
                                                        3*cm->nrows*cm->ncols);
                        }
                } else if (dtype == DTdouble) {
                        double  dc[3];                  /* load from double */
                        COLORV  *cvp = cm->cmem;
                        int     n = nrows*ncols;

                        if (n <= 0)
                                goto not_handled;
                        while (n--) {
                                if (getbinary(dc, sizeof(double), 3, fp) != 3)
                                        goto EOFerror;
                                if (swap) swap64((char *)dc, 3);
                                copycolor(cvp, dc);
                                cvp += 3;
                        }
                } else /* dtype == DTfloat */ {
                        float   fc[3];                  /* load from float */
                        COLORV  *cvp = cm->cmem;
                        int     n = nrows*ncols;

                        if (n <= 0)
                                goto not_handled;
                        while (n--) {
                                if (getbinary(fc, sizeof(float), 3, fp) != 3)
                                        goto EOFerror;
                                if (swap) swap32((char *)fc, 3);
                                copycolor(cvp, fc);
                                cvp += 3;
                        }
                }
                if (fgetc(fp) != EOF) {
                                sprintf(errmsg,
                                "unexpected data at end of binary input '%s'",
                                                inspec);
                                error(WARNING, errmsg);
                }
        }
cleanup:
        if (fp != stdin) {
                if (inspec[0] != '!')
                        fclose(fp);
                else if (pclose(fp)) {
                        sprintf(errmsg, "error running command '%s'", inspec);
                        error(WARNING, errmsg);
                }
        }
#ifdef getc_unlocked
        else
                funlockfile(fp);
#endif
        return(cm);
EOFerror:
        sprintf(errmsg, "unexpected EOF reading %s", inspec);
        error(USER, errmsg);
        return(NULL);
not_handled:
        error(INTERNAL, "unhandled data size or length in cm_load()");
        return(NULL);   /* gratis return */
}

/* Extract a column vector from a matrix */
CMATRIX *
cm_column(const CMATRIX *cm, int c)
{
        CMATRIX *cvr;
        int     dr;

        if (!cm)
                return(NULL);
        if ((c < 0) | (c >= cm->ncols))
                error(INTERNAL, "column requested outside matrix");
        cvr = cm_alloc(cm->nrows, 1);
        if (!cvr)
                return(NULL);
        for (dr = 0; dr < cm->nrows; dr++) {
                const COLORV    *sp = cm_lval(cm,dr,c);
                COLORV          *dp = cv_lval(cvr,dr);
                dp[0] = sp[0];
                dp[1] = sp[1];
                dp[2] = sp[2];
        }
        return(cvr);
}

/* Multiply two matrices (or a matrix and a vector) and allocate the result */
CMATRIX *
cm_multiply(const CMATRIX *cm1, const CMATRIX *cm2)
{
        char    *rowcheck=NULL, *colcheck=NULL;
        CMATRIX *cmr;
        int     dr, dc, i;

        if (!cm1 | !cm2)
                return(NULL);
        if ((cm1->ncols <= 0) | (cm1->ncols != cm2->nrows))
                error(INTERNAL, "matrix dimension mismatch in cm_multiply()");
        cmr = cm_alloc(cm1->nrows, cm2->ncols);
        if (!cmr)
                return(NULL);
                                /* optimization: check for zero rows & cols */
        if (((cm1->nrows > 5) | (cm2->ncols > 5)) & (cm1->ncols > 5)) {
                static const COLOR      czero;
                rowcheck = (char *)calloc(cmr->nrows, 1);
                for (dr = cm1->nrows*(rowcheck != NULL); dr--; )
                    for (dc = cm1->ncols; dc--; )
                        if (memcmp(cm_lval(cm1,dr,dc), czero, sizeof(COLOR))) {
                                rowcheck[dr] = 1;
                                break;
                        }
                colcheck = (char *)calloc(cmr->ncols, 1);
                for (dc = cm2->ncols*(colcheck != NULL); dc--; )
                    for (dr = cm2->nrows; dr--; )
                        if (memcmp(cm_lval(cm2,dr,dc), czero, sizeof(COLOR))) {
                                colcheck[dc] = 1;
                                break;
                        }
        }
        for (dr = 0; dr < cmr->nrows; dr++)
            for (dc = 0; dc < cmr->ncols; dc++) {
                COLORV  *dp = cm_lval(cmr,dr,dc);
                double  res[3];
                dp[0] = dp[1] = dp[2] = 0;
                if (rowcheck && !rowcheck[dr])
                        continue;
                if (colcheck && !colcheck[dc])
                        continue;
                res[0] = res[1] = res[2] = 0;
                for (i = 0; i < cm1->ncols; i++) {
                    const COLORV        *cp1 = cm_lval(cm1,dr,i);
                    const COLORV        *cp2 = cm_lval(cm2,i,dc);
                    res[0] += (double)cp1[0] * cp2[0];
                    res[1] += (double)cp1[1] * cp2[1];
                    res[2] += (double)cp1[2] * cp2[2];
                }
                copycolor(dp, res);
            }
        if (rowcheck) free(rowcheck);
        if (colcheck) free(colcheck);
        return(cmr);
}

/* write out matrix to file (precede by resolution string if picture) */
int
cm_write(const CMATRIX *cm, int dtype, FILE *fp)
{
        static const char       tabEOL[2] = {'\t','\n'};
        const COLORV            *mp;
        int                     r, c;

        if (!cm)
                return(0);
        mp = cm->cmem;
        switch (dtype) {
        case DTascii:
                for (r = 0; r < cm->nrows; r++)
                        for (c = 0; c < cm->ncols; c++, mp += 3)
                                fprintf(fp, "%.6e %.6e %.6e%c",
                                                mp[0], mp[1], mp[2],
                                                tabEOL[c >= cm->ncols-1]);
                break;
        case DTfloat:
        case DTdouble:
                if (sizeof(COLOR) == cm_elem_size[dtype]) {
                        r = cm->ncols*cm->nrows;
                        while (r > 0) {
                                c = putbinary(mp, sizeof(COLOR), r, fp);
                                if (c <= 0)
                                        return(0);
                                mp += 3*c;
                                r -= c;
                        }
                } else if (dtype == DTdouble) {
                        double  dc[3];
                        r = cm->ncols*cm->nrows;
                        while (r--) {
                                copycolor(dc, mp);
                                if (putbinary(dc, sizeof(double), 3, fp) != 3)
                                        return(0);
                                mp += 3;
                        }
                } else /* dtype == DTfloat */ {
                        float   fc[3];
                        r = cm->ncols*cm->nrows;
                        while (r--) {
                                copycolor(fc, mp);
                                if (putbinary(fc, sizeof(float), 3, fp) != 3)
                                        return(0);
                                mp += 3;
                        }
                }
                break;
        case DTrgbe:
        case DTxyze:
                fprtresolu(cm->ncols, cm->nrows, fp);
                for (r = 0; r < cm->nrows; r++, mp += 3*cm->ncols)
                        if (fwritescan((COLOR *)mp, cm->ncols, fp) < 0)
                                return(0);
                break;
        default:
                fputs("Unsupported data type in cm_write()!\n", stderr);
                return(0);
        }
        return(fflush(fp) == 0);
}
Revision:	2.29
Committed:	Fri Jan 15 02:46:28 2021 UTC (4 years, 9 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.28:	+2 -2 lines
Log Message:	fix: fixed malloc() call overflow for large matrices
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.29	static const char RCSid[] = "$Id: cmatrix.c,v 2.28 2020/03/30 20:41:47 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* Color matrix routines.
6			*
7			* G. Ward
8			*/
9
10			#include <ctype.h>
11	schorsch	2.16	#include "platform.h"
12	greg	2.1	#include "standard.h"
13			#include "cmatrix.h"
14			#include "platform.h"
15	greg	2.14	#include "paths.h"
16	greg	2.2	#include "resolu.h"
17
18			const char *cm_fmt_id[] = {
19	greg	2.24	"unknown", COLRFMT, CIEFMT,
20			"float", "ascii", "double"
21	greg	2.2	};
22
23			const int cm_elem_size[] = {
24	greg	2.26	0, 4, 4, 3sizeof(float), 0, 3sizeof(double)
25	greg	2.2	};
26	greg	2.1
27			/* Allocate a color coefficient matrix */
28			CMATRIX *
29			cm_alloc(int nrows, int ncols)
30			{
31			CMATRIX *cm;
32
33			if ((nrows <= 0) \| (ncols <= 0))
34			error(USER, "attempt to create empty matrix");
35			cm = (CMATRIX *)malloc(sizeof(CMATRIX) +
36	greg	2.29	sizeof(COLOR)((size_t)nrowsncols - 1));
37	greg	2.21	if (!cm)
38	greg	2.1	error(SYSTEM, "out of memory in cm_alloc()");
39			cm->nrows = nrows;
40			cm->ncols = ncols;
41			return(cm);
42			}
43
44	greg	2.6	static void
45			adjacent_ra_sizes(size_t bounds[2], size_t target)
46			{
47			bounds[0] = 0; bounds[1] = 2048;
48			while (bounds[1] < target) {
49			bounds[0] = bounds[1];
50			bounds[1] += bounds[1]>>1;
51			}
52			}
53
54	greg	2.1	/* Resize color coefficient matrix */
55			CMATRIX *
56			cm_resize(CMATRIX *cm, int nrows)
57			{
58	greg	2.6	size_t old_size, new_size, ra_bounds[2];
59
60	greg	2.21	if (!cm)
61			return(NULL);
62	greg	2.1	if (nrows == cm->nrows)
63			return(cm);
64			if (nrows <= 0) {
65			cm_free(cm);
66			return(NULL);
67			}
68	greg	2.6	old_size = sizeof(CMATRIX) + sizeof(COLOR)(cm->nrowscm->ncols - 1);
69			adjacent_ra_sizes(ra_bounds, old_size);
70			new_size = sizeof(CMATRIX) + sizeof(COLOR)(nrowscm->ncols - 1);
71			if (nrows < cm->nrows ? new_size <= ra_bounds[0] :
72			new_size > ra_bounds[1]) {
73			adjacent_ra_sizes(ra_bounds, new_size);
74			cm = (CMATRIX *)realloc(cm, ra_bounds[1]);
75	greg	2.21	if (!cm)
76	greg	2.6	error(SYSTEM, "out of memory in cm_resize()");
77			}
78	greg	2.1	cm->nrows = nrows;
79			return(cm);
80			}
81
82	greg	2.5	typedef struct {
83			int dtype; /* data type */
84	greg	2.22	int need2swap; /* need byte swap? */
85	greg	2.5	int nrows, ncols; /* matrix size */
86	greg	2.25	COLOR expos; /* exposure value */
87	greg	2.5	char err; / error message */
88			} CMINFO; /* header info record */
89
90	greg	2.1	static int
91	greg	2.5	get_cminfo(char s, void p)
92	greg	2.1	{
93	greg	2.5	CMINFO ip = (CMINFO )p;
94	greg	2.20	char fmt[MAXFMTLEN];
95	greg	2.2	int i;
96	greg	2.5
97			if (!strncmp(s, "NCOMP=", 6) && atoi(s+6) != 3) {
98			ip->err = "unexpected # components (must be 3)";
99			return(-1);
100			}
101			if (!strncmp(s, "NROWS=", 6)) {
102			ip->nrows = atoi(s+6);
103			return(0);
104			}
105			if (!strncmp(s, "NCOLS=", 6)) {
106			ip->ncols = atoi(s+6);
107			return(0);
108			}
109	greg	2.22	if ((i = isbigendian(s)) >= 0) {
110			ip->need2swap = (nativebigendian() != i);
111			return(0);
112			}
113	greg	2.25	if (isexpos(s)) {
114			double d = exposval(s);
115			scalecolor(ip->expos, d);
116			return(0);
117			}
118			if (iscolcor(s)) {
119			COLOR ctmp;
120			colcorval(ctmp, s);
121			multcolor(ip->expos, ctmp);
122			return(0);
123			}
124	greg	2.2	if (!formatval(fmt, s))
125			return(0);
126			for (i = 1; i < DTend; i++)
127			if (!strcmp(fmt, cm_fmt_id[i]))
128	greg	2.5	ip->dtype = i;
129	greg	2.1	return(0);
130			}
131
132	greg	2.5	/* Load header to obtain/check data type and number of columns */
133			char *
134	greg	2.25	cm_getheader(int dt, int nr, int nc, int swp, COLOR scale, FILE *fp)
135	greg	2.1	{
136	greg	2.5	CMINFO cmi;
137			/* read header */
138			cmi.dtype = DTfromHeader;
139	greg	2.22	cmi.need2swap = 0;
140	greg	2.25	cmi.expos[0] = cmi.expos[1] = cmi.expos[2] = 1.f;
141	greg	2.5	cmi.nrows = cmi.ncols = 0;
142			cmi.err = "unexpected EOF in header";
143	greg	2.7	if (getheader(fp, get_cminfo, &cmi) < 0)
144	greg	2.5	return(cmi.err);
145	greg	2.21	if (dt) { /* get/check data type? */
146	greg	2.5	if (cmi.dtype == DTfromHeader) {
147			if (*dt == DTfromHeader)
148			return("missing/unknown data format in header");
149			} else if (*dt == DTfromHeader)
150			*dt = cmi.dtype;
151			else if (*dt != cmi.dtype)
152			return("unexpected data format in header");
153			}
154	greg	2.21	if (nr) { /* get/check #rows? */
155	greg	2.5	if (*nr <= 0)
156			*nr = cmi.nrows;
157			else if ((cmi.nrows > 0) & (*nr != cmi.nrows))
158			return("unexpected row count in header");
159			}
160	greg	2.21	if (nc) { /* get/check #columns? */
161	greg	2.5	if (*nc <= 0)
162			*nc = cmi.ncols;
163			else if ((cmi.ncols > 0) & (*nc != cmi.ncols))
164			return("unexpected column count in header");
165			}
166	greg	2.22	if (swp) /* get/check swap? */
167			*swp = cmi.need2swap;
168	greg	2.25	if (scale) { /* transfer exposure comp. */
169			scale[0] = 1.f/cmi.expos[0];
170			scale[1] = 1.f/cmi.expos[1];
171			scale[2] = 1.f/cmi.expos[2];
172			}
173	greg	2.5	return(NULL);
174	greg	2.1	}
175
176	greg	2.23	/* Allocate and load image data into matrix */
177			static CMATRIX *
178	greg	2.25	cm_load_rgbe(FILE *fp, int nrows, int ncols, COLOR scale)
179	greg	2.23	{
180	greg	2.25	int doscale;
181	greg	2.23	CMATRIX *cm;
182			COLORV *mp;
183			/* header already loaded */
184			cm = cm_alloc(nrows, ncols);
185			if (!cm)
186			return(NULL);
187	greg	2.25	doscale = (scale[0] < .99) \| (scale[0] > 1.01) \|
188			(scale[1] < .99) \| (scale[1] > 1.01) \|
189			(scale[2] < .99) \| (scale[2] > 1.01) ;
190	greg	2.23	mp = cm->cmem;
191			while (nrows--) {
192			if (freadscan((COLOR *)mp, ncols, fp) < 0) {
193			error(USER, "error reading color picture as matrix");
194			cm_free(cm);
195			return(NULL);
196			}
197	greg	2.25	if (doscale) {
198			int i = ncols;
199			while (i--) {
200			mp++ = scale[0];
201			mp++ = scale[1];
202			mp++ = scale[2];
203			}
204			} else
205			mp += 3*ncols;
206	greg	2.23	} /* caller closes stream */
207			return(cm);
208			}
209
210	greg	2.9	/* Allocate and load a matrix from the given input (or stdin if NULL) */
211	greg	2.1	CMATRIX *
212	greg	2.9	cm_load(const char *inspec, int nrows, int ncols, int dtype)
213	greg	2.1	{
214	greg	2.15	const int ROWINC = 2048;
215			FILE *fp = stdin;
216	greg	2.22	int swap = 0;
217	greg	2.25	COLOR scale;
218	greg	2.15	CMATRIX *cm;
219	greg	2.1
220	greg	2.21	if (!inspec)
221	greg	2.9	inspec = "<stdin>";
222			else if (inspec[0] == '!') {
223			fp = popen(inspec+1, "r");
224	greg	2.21	if (!fp) {
225	greg	2.9	sprintf(errmsg, "cannot start command '%s'", inspec);
226			error(SYSTEM, errmsg);
227			}
228	greg	2.21	} else if (!(fp = fopen(inspec, "r"))) {
229	greg	2.9	sprintf(errmsg, "cannot open file '%s'", inspec);
230	greg	2.1	error(SYSTEM, errmsg);
231			}
232			#ifdef getc_unlocked
233			flockfile(fp);
234			#endif
235			if (dtype != DTascii)
236			SET_FILE_BINARY(fp); /* doesn't really work */
237	greg	2.5	if (!dtype \| !ncols) { /* expecting header? */
238	greg	2.25	char *err = cm_getheader(&dtype, &nrows, &ncols, &swap, scale, fp);
239	greg	2.21	if (err)
240	greg	2.5	error(USER, err);
241			}
242	greg	2.28	if (ncols <= 0 && !fscnresolu(&ncols, &nrows, fp))
243			error(USER, "unspecified number of columns");
244	greg	2.1	switch (dtype) {
245			case DTascii:
246			case DTfloat:
247			case DTdouble:
248			break;
249	greg	2.23	case DTrgbe:
250			case DTxyze:
251	greg	2.25	cm = cm_load_rgbe(fp, nrows, ncols, scale);
252	greg	2.23	goto cleanup;
253	greg	2.1	default:
254			error(USER, "unexpected data type in cm_load()");
255			}
256			if (nrows <= 0) { /* don't know length? */
257			int guessrows = 147; /* usually big enough */
258	greg	2.27	if (cm_elem_size[dtype] && (fp != stdin) & (inspec[0] != '!')) {
259	greg	2.1	long startpos = ftell(fp);
260			if (fseek(fp, 0L, SEEK_END) == 0) {
261	greg	2.27	long rowsiz = (long)ncols*cm_elem_size[dtype];
262	greg	2.1	long endpos = ftell(fp);
263
264	greg	2.27	if ((endpos - startpos) % rowsiz) {
265	greg	2.1	sprintf(errmsg,
266			"improper length for binary file '%s'",
267	greg	2.9	inspec);
268	greg	2.1	error(USER, errmsg);
269			}
270	greg	2.27	guessrows = (endpos - startpos)/rowsiz;
271	greg	2.1	if (fseek(fp, startpos, SEEK_SET) < 0) {
272			sprintf(errmsg,
273			"fseek() error on file '%s'",
274	greg	2.9	inspec);
275	greg	2.1	error(SYSTEM, errmsg);
276			}
277			nrows = guessrows; /* we're confident */
278			}
279			}
280			cm = cm_alloc(guessrows, ncols);
281			} else
282			cm = cm_alloc(nrows, ncols);
283	greg	2.21	if (!cm) /* XXX never happens */
284	greg	2.1	return(NULL);
285			if (dtype == DTascii) { /* read text file */
286			int maxrow = (nrows > 0 ? nrows : 32000);
287			int r, c;
288			for (r = 0; r < maxrow; r++) {
289			if (r >= cm->nrows) /* need more space? */
290	greg	2.15	cm = cm_resize(cm, cm->nrows+ROWINC);
291	greg	2.1	for (c = 0; c < ncols; c++) {
292			COLORV *cv = cm_lval(cm,r,c);
293	greg	2.13	if (fscanf(fp, COLSPEC, cv, cv+1, cv+2) != 3) {
294	greg	2.1	if ((nrows <= 0) & (r > 0) & !c) {
295			cm = cm_resize(cm, maxrow=r);
296			break;
297			} else
298			goto EOFerror;
299	greg	2.13	}
300	greg	2.1	}
301			}
302			while ((c = getc(fp)) != EOF)
303			if (!isspace(c)) {
304			sprintf(errmsg,
305	greg	2.9	"unexpected data at end of ascii input '%s'",
306			inspec);
307	greg	2.1	error(WARNING, errmsg);
308			break;
309			}
310			} else { /* read binary file */
311	greg	2.2	if (sizeof(COLOR) == cm_elem_size[dtype]) {
312	greg	2.1	int nread = 0;
313			do { /* read all we can */
314	greg	2.17	nread += getbinary(cm->cmem + 3*nread,
315	greg	2.4	sizeof(COLOR),
316	greg	2.1	cm->nrows*cm->ncols - nread,
317			fp);
318			if (nrows <= 0) { /* unknown length */
319			if (nread == cm->nrows*cm->ncols)
320			/* need more space? */
321	greg	2.15	cm = cm_resize(cm, cm->nrows+ROWINC);
322	greg	2.1	else if (nread && !(nread % cm->ncols))
323			/* seem to be done */
324			cm = cm_resize(cm, nread/cm->ncols);
325			else /* ended mid-row */
326			goto EOFerror;
327			} else if (nread < cm->nrows*cm->ncols)
328			goto EOFerror;
329			} while (nread < cm->nrows*cm->ncols);
330
331	greg	2.26	if (swap) {
332			if (sizeof(COLORV) == 4)
333			swap32((char *)cm->cmem,
334			3cm->nrowscm->ncols);
335			else /* sizeof(COLORV) == 8 */
336			swap64((char *)cm->cmem,
337			3cm->nrowscm->ncols);
338			}
339	greg	2.1	} else if (dtype == DTdouble) {
340			double dc[3]; /* load from double */
341			COLORV *cvp = cm->cmem;
342			int n = nrows*ncols;
343
344			if (n <= 0)
345			goto not_handled;
346			while (n--) {
347	greg	2.17	if (getbinary(dc, sizeof(double), 3, fp) != 3)
348	greg	2.1	goto EOFerror;
349	greg	2.26	if (swap) swap64((char *)dc, 3);
350	greg	2.1	copycolor(cvp, dc);
351			cvp += 3;
352			}
353			} else /* dtype == DTfloat */ {
354			float fc[3]; /* load from float */
355			COLORV *cvp = cm->cmem;
356			int n = nrows*ncols;
357
358			if (n <= 0)
359			goto not_handled;
360			while (n--) {
361	greg	2.17	if (getbinary(fc, sizeof(float), 3, fp) != 3)
362	greg	2.1	goto EOFerror;
363	greg	2.26	if (swap) swap32((char *)fc, 3);
364	greg	2.1	copycolor(cvp, fc);
365			cvp += 3;
366			}
367			}
368			if (fgetc(fp) != EOF) {
369			sprintf(errmsg,
370	greg	2.9	"unexpected data at end of binary input '%s'",
371			inspec);
372	greg	2.1	error(WARNING, errmsg);
373			}
374			}
375	greg	2.23	cleanup:
376	greg	2.9	if (fp != stdin) {
377			if (inspec[0] != '!')
378			fclose(fp);
379			else if (pclose(fp)) {
380			sprintf(errmsg, "error running command '%s'", inspec);
381			error(WARNING, errmsg);
382			}
383			}
384	greg	2.1	#ifdef getc_unlocked
385			else
386			funlockfile(fp);
387			#endif
388			return(cm);
389			EOFerror:
390	greg	2.9	sprintf(errmsg, "unexpected EOF reading %s", inspec);
391	greg	2.1	error(USER, errmsg);
392	greg	2.23	return(NULL);
393	greg	2.1	not_handled:
394			error(INTERNAL, "unhandled data size or length in cm_load()");
395			return(NULL); /* gratis return */
396			}
397
398			/* Extract a column vector from a matrix */
399			CMATRIX *
400			cm_column(const CMATRIX *cm, int c)
401			{
402			CMATRIX *cvr;
403			int dr;
404
405	greg	2.21	if (!cm)
406			return(NULL);
407	greg	2.1	if ((c < 0) \| (c >= cm->ncols))
408			error(INTERNAL, "column requested outside matrix");
409			cvr = cm_alloc(cm->nrows, 1);
410	greg	2.21	if (!cvr)
411	greg	2.1	return(NULL);
412			for (dr = 0; dr < cm->nrows; dr++) {
413			const COLORV *sp = cm_lval(cm,dr,c);
414			COLORV *dp = cv_lval(cvr,dr);
415			dp[0] = sp[0];
416			dp[1] = sp[1];
417			dp[2] = sp[2];
418			}
419			return(cvr);
420			}
421
422			/* Multiply two matrices (or a matrix and a vector) and allocate the result */
423			CMATRIX *
424			cm_multiply(const CMATRIX cm1, const CMATRIX cm2)
425			{
426			char rowcheck=NULL, colcheck=NULL;
427			CMATRIX *cmr;
428			int dr, dc, i;
429
430	greg	2.21	if (!cm1 \| !cm2)
431			return(NULL);
432	greg	2.1	if ((cm1->ncols <= 0) \| (cm1->ncols != cm2->nrows))
433			error(INTERNAL, "matrix dimension mismatch in cm_multiply()");
434			cmr = cm_alloc(cm1->nrows, cm2->ncols);
435	greg	2.21	if (!cmr)
436	greg	2.1	return(NULL);
437			/* optimization: check for zero rows & cols */
438			if (((cm1->nrows > 5) \| (cm2->ncols > 5)) & (cm1->ncols > 5)) {
439			static const COLOR czero;
440			rowcheck = (char *)calloc(cmr->nrows, 1);
441			for (dr = cm1->nrows*(rowcheck != NULL); dr--; )
442			for (dc = cm1->ncols; dc--; )
443			if (memcmp(cm_lval(cm1,dr,dc), czero, sizeof(COLOR))) {
444			rowcheck[dr] = 1;
445			break;
446			}
447			colcheck = (char *)calloc(cmr->ncols, 1);
448			for (dc = cm2->ncols*(colcheck != NULL); dc--; )
449			for (dr = cm2->nrows; dr--; )
450			if (memcmp(cm_lval(cm2,dr,dc), czero, sizeof(COLOR))) {
451			colcheck[dc] = 1;
452			break;
453			}
454			}
455			for (dr = 0; dr < cmr->nrows; dr++)
456			for (dc = 0; dc < cmr->ncols; dc++) {
457			COLORV *dp = cm_lval(cmr,dr,dc);
458	greg	2.4	double res[3];
459	greg	2.1	dp[0] = dp[1] = dp[2] = 0;
460	greg	2.21	if (rowcheck && !rowcheck[dr])
461	greg	2.1	continue;
462	greg	2.21	if (colcheck && !colcheck[dc])
463	greg	2.1	continue;
464	greg	2.4	res[0] = res[1] = res[2] = 0;
465	greg	2.1	for (i = 0; i < cm1->ncols; i++) {
466			const COLORV *cp1 = cm_lval(cm1,dr,i);
467			const COLORV *cp2 = cm_lval(cm2,i,dc);
468	greg	2.18	res[0] += (double)cp1[0] * cp2[0];
469			res[1] += (double)cp1[1] * cp2[1];
470			res[2] += (double)cp1[2] * cp2[2];
471	greg	2.1	}
472	greg	2.4	copycolor(dp, res);
473	greg	2.1	}
474	greg	2.21	if (rowcheck) free(rowcheck);
475			if (colcheck) free(colcheck);
476	greg	2.1	return(cmr);
477			}
478
479	greg	2.2	/* write out matrix to file (precede by resolution string if picture) */
480			int
481			cm_write(const CMATRIX cm, int dtype, FILE fp)
482	greg	2.1	{
483	greg	2.3	static const char tabEOL[2] = {'\t','\n'};
484	greg	2.21	const COLORV *mp;
485	greg	2.3	int r, c;
486	greg	2.2
487	greg	2.21	if (!cm)
488			return(0);
489			mp = cm->cmem;
490	greg	2.2	switch (dtype) {
491			case DTascii:
492	greg	2.3	for (r = 0; r < cm->nrows; r++)
493	greg	2.2	for (c = 0; c < cm->ncols; c++, mp += 3)
494	greg	2.3	fprintf(fp, "%.6e %.6e %.6e%c",
495			mp[0], mp[1], mp[2],
496			tabEOL[c >= cm->ncols-1]);
497	greg	2.2	break;
498			case DTfloat:
499			case DTdouble:
500			if (sizeof(COLOR) == cm_elem_size[dtype]) {
501			r = cm->ncols*cm->nrows;
502			while (r > 0) {
503	greg	2.17	c = putbinary(mp, sizeof(COLOR), r, fp);
504	greg	2.2	if (c <= 0)
505			return(0);
506			mp += 3*c;
507			r -= c;
508			}
509			} else if (dtype == DTdouble) {
510			double dc[3];
511			r = cm->ncols*cm->nrows;
512			while (r--) {
513			copycolor(dc, mp);
514	greg	2.17	if (putbinary(dc, sizeof(double), 3, fp) != 3)
515	greg	2.2	return(0);
516			mp += 3;
517			}
518			} else /* dtype == DTfloat */ {
519			float fc[3];
520			r = cm->ncols*cm->nrows;
521			while (r--) {
522			copycolor(fc, mp);
523	greg	2.17	if (putbinary(fc, sizeof(float), 3, fp) != 3)
524	greg	2.2	return(0);
525			mp += 3;
526			}
527			}
528			break;
529			case DTrgbe:
530			case DTxyze:
531			fprtresolu(cm->ncols, cm->nrows, fp);
532			for (r = 0; r < cm->nrows; r++, mp += 3*cm->ncols)
533			if (fwritescan((COLOR *)mp, cm->ncols, fp) < 0)
534			return(0);
535			break;
536			default:
537			fputs("Unsupported data type in cm_write()!\n", stderr);
538			return(0);
539	greg	2.1	}
540	greg	2.2	return(fflush(fp) == 0);
541	greg	2.1	}