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matvar.c
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matvar.c
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// matvar.c - MATLAB variable and MAT file functions
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "sigpro.h"
#ifdef WIN32
#include <io.h>
#else
#include <unistd.h>
#define _strdup strdup
#endif
#define MAXNCH 256
#define free_null(x) if(x){free(x);x=NULL;}
#ifndef O_BINARY
#define O_BINARY 0
#endif
#define PMODE (S_IREAD|S_IWRITE)
#define AFLAG (O_RDWR|O_BINARY)
#define OFLAG (O_RDWR|O_CREAT|O_BINARY)
#define OPMOD (O_RDONLY|O_BINARY)
/********************************* MAT **************************************/
// v4 data types
// 0: float*8
// 1: float*4
// 2: int*4
// 3: int*2
// 4: uint*4
// v5 data types
// 0: ???
// 1: int*1
// 2: uint*1
// 3: int*2
// 4: uint*2
// 5: int*4
// 6: uint*4
// 7: float*4
// 8: ???
// 9: float*8
//10: ???
//11: ???
//12: int*8
//13: uint*8
//14: matrix
//15: compressed
//16: utf*1
//17: utf*2
//18: utf*4
static int bs4[6] = {8, 4, 4, 2, 4, 2};
static int bs5[20] = {
0, 1, 1, 2, 2, 4, 4, 4, 0, 8,
0, 0, 8, 8, 0, 0, 1, 2, 4, 0
};
static int dt4[20] = {
-1, -1, -1, 3, 3, 2, 4, 1, -1, 0,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
};
static int dt5[6] = {9, 7, 5, 3, 6, 4};
static unsigned char *uncmp = NULL;
/*............................ MAT READ ................................*/
typedef struct {
int32_t data, next, nbyt, ofst, imag, rows, cols;
char type, text, cmpx, vers, bswp;
char name[MAXNCH];
} MATHDR;
/* mswab - swap bytes of m-byte sets */
static void
mswab(char *a, int m, int n)
{
char *b, *c, t;
while (n-- > 0) {
b = a;
c = a + m - 1;
while (c > b) {
t = *b;
*b++ = *c;
*c-- = t;
}
a += m;
}
}
/* cpu_lsb - check processor byte order */
static int
cpu_lsb(int i)
{
int16_t a = 1;
char *b = (char *) (&a);
return (b[i]);
}
/* ismat5 - test if file is MAT v5 format */
static int
ismat5(char *s)
{
int status = 0;
if (strncmp(s, "MATLAB", 6) == 0
&& s[124] == 0
&& s[125] == 1
&& s[126] == 'I'
&& s[127] == 'M') {
status = 1;
}
return (status);
}
/* ismat4 - test if file is MAT v4 format */
static int
ismat4(char *s, int bs)
{
char typ[4];
int status = 0;
uint32_t *hdr = (uint32_t *)s;
if (bs)
mswab((char *) hdr, 4, 5);
if (hdr[0] > 9999)
return (0);
typ[0] = (char) (hdr[0] / 1000) % 10; /* M */
typ[1] = (char) (hdr[0] / 100) % 10; /* O */
typ[2] = (char) (hdr[0] / 10) % 10; /* P */
typ[3] = (char) (hdr[0] / 1) % 10; /* T */
if ( (typ[0] == 0 || typ[0] == 1)
&& (typ[1] == 0 || typ[1] == 1)
&& (typ[2] >= 0 && typ[2] <= 4)
&& (typ[3] == 0 || typ[3] == 1)
&& (hdr[0] == 1 || hdr[1] > 0 || hdr[2] > 0)
&& (hdr[3] == 0 || hdr[3] == 1)
&& (hdr[4] > 0 && hdr[4] <= MAXNCH))
status = 1;
return (status);
}
/* rdhdr5 - read MAT v5 header */
static int
rdhdr5(FILE *fp, MATHDR *mh)
{
int32_t nc, nbd, ofst, gap;
uint32_t h[10];
uint16_t w[2];
if (fread(h, 4, 2, fp) < 2)
return (0);
mh->next += h[1] + 8;
if (h[0] == 15) { // compressed data ?
#ifndef ZLIB
strcpy(mh->name, "");
mh->type = h[0];
mh->rows = h[1];
mh->data = mh->next + 8;
mh->vers = 6;
#else
#undef FAR
#define FAR
#include <zlib.h>
Bytef *compr;
uLongf nbc, nbu;
int status;
mh->data = ftell(fp);
nbc = h[1];
nbu = nbc * 10 + 100; // ???
compr = (Bytef *) malloc(nbc);
uncmp = (Bytef *) malloc(nbu);
if (fread(compr, 1, nbc, fp) < (int) nbc) {
strcpy(mh->name, "read error");
return (0);
}
status = uncompress(uncmp, &nbu, compr, nbc);
if (status == Z_OK) {
strcpy(mh->name, "");
} else if (status == Z_MEM_ERROR) {
strcpy(mh->name, "mem error");
} else if (status == Z_BUF_ERROR) {
strcpy(mh->name, "buf error");
} else if (status == Z_DATA_ERROR) {
strcpy(mh->name, "data error");
} else {
strcpy(mh->name, "<error>");
}
if (status != Z_OK) {
mh->type = (char) h[0];
mh->rows = nbc;
return (1);
}
ofst = 0;
memcpy(h, uncmp + ofst, 40);
ofst += 40;
memcpy(w, uncmp + ofst, 4);
ofst += 4;
if (w[1]) {
nc = w[1];
} else {
memcpy(&nc, uncmp + ofst, 4);
ofst += 4;
}
memcpy(mh->name, uncmp + ofst, nc);
ofst += nc;
mh->name[nc] = '\0';
ofst += 8 - (ofst % 8);
memcpy(w, uncmp + ofst, 4);
ofst += 4;
if (w[1]) {
nbd = w[1];
} else {
memcpy(&nbd, uncmp + ofst, 4);
ofst += 4;
}
free(compr);
mh->rows = h[8];
mh->cols = h[9];
mh->type = (char) w[0];
mh->text = (h[4] == 4);
mh->cmpx = (w[0] == 0);
mh->nbyt = nbd;
mh->ofst = ofst;
mh->vers = 6;
#endif
} else {
if (fread(h + 2, 4, 8, fp) < 8)
return (0);
if (fread(w, 2, 2, fp) < 2)
return (0);
if (w[1]) {
nc = w[1];
} else {
if (fread(&nc, 4, 1, fp) < 1)
return (0);
}
if (fread(mh->name, nc, 1, fp) < 1)
return (0);
mh->name[nc] = '\0';
ofst = ftell(fp);
if (ofst % 8)
ofst = fseek(fp, 8 - (ofst % 8), 1);
if (fread(w, 2, 2, fp) < 2)
return (0);
if (w[1]) {
nbd = w[1];
} else {
if (fread(&nbd, 4, 1, fp) < 1)
return (0);
}
gap = (w[1] & 4) ? 4 : 8;
mh->rows = h[8];
mh->cols = h[9];
mh->type = (char) w[0];
mh->text = (h[4] == 4);
mh->cmpx = (h[4] >> 11) & 1;
mh->data = ftell(fp);
mh->nbyt = nbd;
mh->imag = mh->cmpx ? mh->data + nbd + gap : 0;
}
return (1);
}
/* rdhdr4 - read MAT v4 header */
static int
rdhdr4(FILE *fp, MATHDR *mh)
{
int P, T, nbyt, ndat, nchr = 0;
uint32_t hdr[12];
/* P= [0,1,2,3,4]=>[R*8,R*4,I*4,I*2,U*4] */
if (fread(hdr, 4, 5, fp) < 5)
return (0);
if (mh->bswp)
mswab((char *) hdr, 4, 5);
/* M = (hdr[0] / 1000) % 10; */
/* O = (hdr[0] / 100) % 10; */
P = (hdr[0] / 10) % 10;
T = (hdr[0] / 1) % 10;
mh->rows = hdr[1];
mh->cols = hdr[2];
mh->cmpx = (char) hdr[3];
nchr = hdr[4];
if (nchr <= 0 || nchr > MAXNCH)
return (0);
if (fread(mh->name, nchr, 1, fp) < 1)
return (0);
nbyt = bs4[P];
ndat = mh->rows * mh->cols;
mh->data = ftell(fp);
if (mh->cmpx) {
mh->imag = mh->data + ndat * nbyt;
mh->next = mh->data + ndat * nbyt *2;
} else {
mh->imag = 0;
mh->next = mh->data + ndat * nbyt;
}
mh->type = dt5[P];
mh->text = T;
mh->nbyt = ndat * nbyt;
return (1);
}
/* rdhdr - read MAT variable header */
static int
rdhdr(FILE *fp, MATHDR *mh)
{
free_null(uncmp);
fseek(fp, mh->next, 0);
if (mh->vers > 4)
return (rdhdr5(fp, mh));
return (rdhdr4(fp, mh));
}
/* ismat - check MAT version */
static int
ismat(char *s, MATHDR *mh)
{
if (ismat5(s)) {
mh->next = 128;
mh->vers = 5;
mh->bswp = ((int16_t *)s)[62] & 0xFF;
} else if (ismat4(s, 0)) {
mh->next = 0;
mh->vers = 4;
mh->bswp = 0;
} else if (ismat4(s, 1)) {
mh->next = 0;
mh->vers = 4;
mh->bswp = 1;
} else {
mh->next = 0;
mh->vers = 0;
mh->bswp = 0;
}
return (mh->vers);
}
/* mat_version - return MAT-file version */
static int
mat_version(const char *fn)
{
char s[128];
int nv = 0;
FILE *fp;
MATHDR mh;
if ((fp = fopen(fn, "rb")) == NULL) {
return (0);
}
fread(s, 1, 128, fp);
if (ismat(s, &mh)) {
for(;;) {
if (!rdhdr(fp, &mh)) {
break;
}
nv++;
}
}
fclose(fp);
return (mh.vers);
}
/* mat_size - count number of variables in MAT file */
static int
mat_size(const char *fn)
{
char s[128];
int nv = 0;
FILE *fp;
MATHDR mh;
if ((fp = fopen(fn, "rb")) == NULL) {
return (0);
}
fread(s, 1, 128, fp);
if (ismat(s, &mh)) {
for(;;) {
if (!rdhdr(fp, &mh)) {
break;
}
nv++;
}
}
fclose(fp);
return (nv);
}
/* mat_name - read variable names from MAT file */
static int
mat_name(const char *fn, VAR *vl, int nv)
{
char s[128];
int i;
FILE *fp;
MATHDR mh;
if ((fp = fopen(fn, "rb")) == NULL) {
return (0);
}
fread(s, 1, 128, fp);
if (ismat(s, &mh)) {
for(i = 0; i < nv; i++) {
if (!rdhdr(fp, &mh)) {
break;
}
vl[i].name = _strdup(mh.name);
vl[i].rows = mh.rows;
vl[i].cols = mh.cols;
vl[i].dtyp = mh.type;
vl[i].text = mh.text;
vl[i].cmpx = mh.cmpx;
vl[i].data = NULL;
}
}
fclose(fp);
return (nv);
}
static int
rd_var(FILE *fp, MATHDR *mh, VAR *vl, int16_t *irc, int16_t *nrc)
{
char *v, *w;
int b, c, m, n, o, r, s, nr, nc;
o = 0;
n = mh->nbyt;
c = mh->cmpx ? 2 : 1;
s = mh->rows * mh->cols;
if (s <= 0) {
return (0);
}
b = mh->nbyt / s;
if (irc) { // specify initial row & column
o = (irc[0] * mh->cols + irc[1]) * b;
n = (n > o) ? (n - o) : 0;
}
if (nrc) { // specify number of rows & columns
nr = nrc[0];
nc = nrc[1];
m = nr * nc;
if (s > m) {
s = m;
n = s * b;
} else {
nr = 1;
nc = s;
}
}
if (n <= 0) {
return (0);
}
v = vl->data = malloc(n * c);
if (nrc) {
vl->rows = nr;
vl->cols = nc;
} else {
vl->rows = mh->rows;
vl->cols = mh->cols;
}
if (uncmp) {
memcpy(v, uncmp + mh->ofst + o, n);
} else {
fseek(fp, mh->data + o, 0);
r = fread(v, 1, n, fp);
if (mh->imag) {
fseek(fp, mh->imag + o, 0);
r = fread(v + n, 1, n, fp);
}
fseek(fp, mh->next, 0);
if (r < 0) {
return (1);
}
}
if (mh->cmpx) {
w = malloc(n * c);
n = b * s;
for (r = 0; r < s; r++) {
o = r * b;
memcpy(w + o * 2 + 0, v + o + 0, b);
memcpy(w + o * 2 + b, v + o + n, b);
}
vl->data = w;
free(v);
}
if (mh->bswp) {
mswab((char *) vl->data, b, s * c);
}
return (0);
}
/* mat_fetch - read specified variable from MAT file */
static int
mat_fetch(const char *fn, VAR *vl, char *vn, int16_t *irc, int16_t *nrc)
{
char s[128];
int i;
FILE *fp;
MATHDR mh;
if ((fp = fopen(fn, "rb")) == NULL) {
return (0);
}
fread(s, 1, 128, fp);
if (ismat(s, &mh)) {
for(;;) {
if (!rdhdr(fp, &mh)) {
break;
}
if (strcmp(vn, mh.name) == 0) {
break;
}
}
if (strcmp(vn, mh.name) == 0) {
i = 0;
rd_var(fp, &mh, vl + i, irc, nrc);
vl[i].name = _strdup(mh.name);
vl[i].dtyp = mh.type;
vl[i].text = mh.text;
vl[i].cmpx = mh.cmpx;
vl[i].last = 1;
}
}
free_null(uncmp);
fclose(fp);
return (1);
}
/* mat_read - read variables from MAT file */
static int
mat_read(const char *fn, VAR *vl, int nv)
{
char s[128];
int i;
FILE *fp;
MATHDR mh;
if ((fp = fopen(fn, "rb")) == NULL) {
return (0);
}
fread(s, 1, 128, fp);
if (ismat(s, &mh)) {
for(i = 0; i < nv; i++) {
if (!rdhdr(fp, &mh)) {
break;
}
vl[i].name = _strdup(mh.name);
vl[i].rows = mh.rows;
vl[i].cols = mh.cols;
vl[i].dtyp = mh.type;
vl[i].text = mh.text;
vl[i].cmpx = mh.cmpx;
if (rd_var(fp, &mh, vl + i, NULL, NULL)) {
break;
}
}
}
free_null(uncmp);
fclose(fp);
return (nv);
}
/*............................ MAT WRITE ................................*/
/*
* matlab header -
* type = MOPT where:
* M=0 for pc; 1 for sun
* O=0 col or 1 row;
* P= [0,1,2,3,4]=>[r*8,r*4,I*4,I*2,I*4 unsigned integers]
* T= 0 for matrix or 1 for text (stored as r*4 numbers 0<i<255).
*/
static int32_t
encode_mopt(int p, int t)
{
int a = 1;
char *b = (char *) (&a);
return (b[1] * 1000 + p * 10 + t);
}
static void
mat_wr(FILE *fp, char *nam, void *d, int r, int c, int dtyp, int txt, int cx)
{
int sz, sw, ne;
int32_t ns, hdr[5];
static int bo = 1; // desired byte order: 0=BE, 1=LE
ns = strlen(nam) + 1;
hdr[0] = encode_mopt(dtyp, txt);
hdr[1] = r; /* rows */
hdr[2] = c; /* cols */
hdr[3] = cx; /* 0 for real, 1 for complex */
hdr[4] = ns; /* name length (including null byte) */
sz = bs4[dtyp];
ne = r * c; /* number of elements = rows * cols */
if (cx) { /* complex ? */
ne *= 2;
}
sw = cpu_lsb(bo); /* swap bytes ? */
if (sw) {
mswab((char *) hdr, 4, 5);
mswab((char *) d, sz, ne);
}
fwrite(hdr, 4, 5, fp);
fwrite(nam, 1, ns, fp);
fwrite(d, sz, ne, fp);
if (sw) {
mswab((char *) hdr, 4, 5);
mswab((char *) d, sz, ne);
}
}
/*..........................................................................*/
typedef struct {
VAR *varlst;
int lstsiz;
} VRL;
static int nvl = 0;
static int nvlsiz = 256;
static VRL *vrl = NULL;
static void
var_clear(int n)
{
int i, nv;
VAR *vl;
vl = vrl[n].varlst;
nv = vrl[n].lstsiz;
for (i = 0; i < nv; i++) {
free_null(vl[i].name);
free_null(vl[i].data);
}
free_null(vl);
}
static int
var_size(VAR *vl)
{
int i;
for (i = 0; i < SP_MAXVAR; i++) {
if (vl[i].last) {
break;
}
}
return (i + 1);
}
static int
var_verify(VAR *vl)
{
int i;
VAR *v1, *v2;
for (i = 0; i < nvl; i++) {
v1 = vrl[i].varlst;
v2 = vrl[i].lstsiz + v1;
if (vl >= v1 && vl < v2) {
return (1);
}
}
return (0);
}
static void
var_string(VAR *vl, const char *name, void *strptr)
{
char *s;
float *data;
int i, n;
s = (char *) strptr;
n = strlen(s);
data = (float *) calloc(n, sizeof(float));
for (i = 0; i < n; i++) {
data[i] = s[i];
}
sp_var_set(vl, name, data, 1, n, "f4");
vl[0].text = 1;
free(data);
}
/*..........................................................................*/
FUNC(VAR *) sp_mat_fetch(
const char *fn,
char *vn,
int16_t *irc,
int16_t *nrc
)
{
VAR *vl;
vl = sp_var_alloc(1);
mat_fetch(fn, vl, vn, irc, nrc);
return (vl);
}
FUNC(VAR *) sp_mat_load(
const char *fn
)
{
int nv;
VAR *vl = NULL;
nv = mat_size(fn);
if (nv > 0) {
vl = sp_var_alloc(nv);
mat_read(fn, vl, nv);
}
return (vl);
}
FUNC(VAR *) sp_mat_whos(
const char *fn
)
{
int nv;
VAR *vl;
nv = mat_size(fn);
vl = sp_var_alloc(nv);
mat_name(fn, vl, nv);
return (vl);
}
FUNC(int) sp_mat_append(
const char *fn,
VAR *vl
)
{
int i, dt;
FILE *fp;
fp = fopen(fn, "ab"); // open the file
if (fp == NULL) {
return (-1);
}
fseek(fp, 0L, SEEK_END);
for (i = 0; i < SP_MAXVAR; i++) {
dt = dt4[(int)vl[i].dtyp];
if (vl[i].name && vl[i].data && dt >= 0
&& vl[i].rows > 0 && vl[i].cols > 0) {
mat_wr(fp, vl[i].name, vl[i].data,
vl[i].rows, vl[i].cols,
dt, vl[i].text, vl[i].cmpx);
}
if (vl[i].last) {
break;
}
}
fclose(fp);
return (0);
}
FUNC(int) sp_mat_save(
const char *fn,
VAR *vl
)
{
int i, dt;
FILE *fp;
fp = fopen(fn, "wb"); // open the file
if (fp == NULL) {
return (-1);
}
for (i = 0; i < SP_MAXVAR; i++) {
dt = dt4[(int)vl[i].dtyp];
if (vl[i].name && vl[i].data && dt >= 0
&& vl[i].rows > 0 && vl[i].cols > 0) {
mat_wr(fp, vl[i].name, vl[i].data,
vl[i].rows, vl[i].cols,
dt, vl[i].text, vl[i].cmpx);
}
if (vl[i].last) {
break;
}
}
fclose(fp);
return (0);
}
FUNC(int) sp_mat_version(
const char *fn
)
{
return (mat_version(fn));
}
FUNC(int) sp_mat_size(
const char *fn
)
{
return (mat_size(fn));
}
FUNC(VAR *) sp_var_alloc(
int nvar
)
{
VAR *vl;
vl = (VAR *) calloc(nvar, sizeof(VAR));
vl[nvar - 1].last = 1;
if (!vrl) {
vrl = (VRL *) calloc(nvlsiz, sizeof(VRL));
nvl = 0;
} else if (nvl == nvlsiz) {
nvlsiz *= 2;
vrl = (VRL *) realloc(vrl, nvlsiz * sizeof(VRL));
}
vrl[nvl].lstsiz = nvar;
vrl[nvl].varlst = vl;
nvl++;
return (vl);
}
FUNC(void) sp_var_clear(
VAR *vl
)
{
int i, j;
for (i = 0; i < nvl; i++) {
if (vrl[i].varlst == vl) {
var_clear(i);
nvl--;
for (j = i; j < nvl; j++) {
vrl[j].varlst = vrl[j+1].varlst;
}
vrl[j].varlst = NULL;
break;
}
}
}
FUNC(void) sp_var_clear_all(
)
{
int i;
for (i = 0; i < nvl; i++) {
var_clear(i);
}
nvl = 0;
}
FUNC(VAR *) sp_var_copy(
VAR *vl
)
{
int i, nv, nd, nb;
VAR *vc;
nv = var_size(vl);
vc = sp_var_alloc(nv);
for(i = 0; i < nv; i++) {
vc[i].name = _strdup(vl[i].name);
vc[i].rows = vl[i].rows;
vc[i].cols = vl[i].cols;
vc[i].dtyp = vl[i].dtyp;
vc[i].cmpx = vl[i].cmpx;
vc[i].text = vl[i].text;
vc[i].last = vl[i].last;
nb = bs5[(int)vl[i].dtyp];
nd = vl[i].rows * vl[i].cols;
nd = vl[i].cmpx ? 2 * nd : nd;
vc[i].data = calloc(nd, nb);
memcpy(vc[i].data, vl[i].data, nd * nb);
}
return (vc);
}
FUNC(void) sp_var_float(
VAR *vl
)
{
char *i1;
double *f8;
float *f4;
int i, j, n;
int32_t *i4;
int16_t *i2;
unsigned char *u1;
uint32_t *u4;
uint16_t *u2;
for(i = 0; i < SP_MAXVAR; i++) {
n = vl[i].rows * vl[i].cols;
n = vl[i].cmpx ? 2 * n : n;
switch (vl[i].dtyp) {
case 1: // int*1
i1 = (char *) vl[i].data;
f4 = (float *) calloc(n, sizeof(float));
for (j = 0; j < n; j++) {
f4[j] = (float) i1[j];
}
free(i1);
vl[i].data = f4;
break;
case 2: // uint*1
u1 = (unsigned char *) vl[i].data;
f4 = (float *) calloc(n, sizeof(float));
for (j = 0; j < n; j++) {
f4[j] = (float) u1[j];
}
free(u1);
vl[i].data = f4;
break;
case 3: // int*2
i2 = (int16_t *) vl[i].data;
f4 = (float *) calloc(n, sizeof(float));
for (j = 0; j < n; j++) {
f4[j] = (float) i2[j];
}
free(i2);
vl[i].data = f4;
break;
case 4: // uint*2
u2 = (uint16_t *) vl[i].data;
f4 = (float *) calloc(n, sizeof(float));
for (j = 0; j < n; j++) {
f4[j] = (float) u2[j];
}
free(u2);
vl[i].data = f4;
break;
case 5: // int*4
i4 = (int32_t *) vl[i].data;
f4 = (float *) calloc(n, sizeof(float));
for (j = 0; j < n; j++) {
f4[j] = (float) i4[j];
}
free(i4);
vl[i].data = f4;
break;
case 6: // uint*4
u4 = (uint32_t *) vl[i].data;
f4 = (float *) calloc(n, sizeof(float));
for (j = 0; j < n; j++) {
f4[j] = (float) u4[j];
}
free(u4);
vl[i].data = f4;
break;
case 0: // text as float*8
case 9: // float*8
f8 = (double *) vl[i].data;
f4 = (float *) calloc(n, sizeof(float));
for (j = 0; j < n; j++) {
f4[j] = (float) f8[j];
}
free(f8);
vl[i].data = f4;
break;
}
if (vl[i].last) {