gnuplot/src/binary.c at branch-4-2-stable · gnuplot/gnuplot · GitHub

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#ifndef lint

static char *RCSid() { return RCSid("$Id: binary.c,v 1.12 2004/07/25 12:25:00 broeker Exp $"); }

#endif

* The addition of gnubin and binary, along with a small patch

* to command.c, will permit gnuplot to plot binary files.

* gnubin - contains the code that relies on gnuplot include files

* and other definitions

* binary - contains those things that are independent of those

* definitions and files

* With these routines, hidden line removal of your binary data is possible!

* Last update: 3/29/92 memory allocation bugs fixed. jvdwoude@hut.nl

* 3/09/92 spelling errors, general cleanup, use alloc with no

* nasty fatal errors

* 3/03/92 for Gnuplot 3.24.

* Created from code for written by RKC for gnuplot 2.0b.

/* NOTE: a significant fraction of these routines is not called from

* anywhere in gnuplot. They're provided as a utility library for

* people wanting to write binary files usable by gnuplot, as the

* bf_test.c demo does it. */

#include "binary.h"

#include "alloc.h"

#include "util.h"

/* This routine scans the first block of the file to see if the file

* is a binary file. A file is considered binary if 10% of the

* characters in it are not in the ascii character set. (values <

* 128), or if a NUL is found. I hope this doesn't break when used on

* the bizzare PC's. */

int

is_binary_file(FILE *fp)

{

int i, len;

int odd; /* Contains a count of the odd characters */

long where;

unsigned char *c;

unsigned char buffer[512];

if ((where = ftell(fp)) == -1) { /* Find out where we start */

fprintf(stderr, "Notice: Assuming unseekable data is not binary\n");

return (FALSE);

} else {

rewind(fp);

len = fread(buffer, sizeof(char), 512, fp);

if (len <= 0) /* Empty file is declared ascii */

return (FALSE);

c = buffer;

/* now scan buffer to look for odd characters */

odd = 0;

for (i = 0; i < len; i++, c++) {

if (!*c) { /* NUL _never_ allowed in text */

odd += len;

break;

} else if ((*c & 128) || /* Meta-characters--we hope it's not formatting */

(*c == 127) || /* DEL */

(*c < 32 &&

*c != '\n' && *c != '\r' && *c != '\b' &&

*c != '\t' && *c != '\f' && *c != 27 /*ESC */ ))

odd++;

}

fseek(fp, where, 0); /* Go back to where we started */

if (odd * 10 > len) /* allow 10% of the characters to be odd */

return (TRUE);

else

return (FALSE);

}

/*========================= I/O Routines ================================

These may be useful for situations other than just gnuplot. Note that I

have included the reading _and_ the writing routines, so others can create

the file as well as read the file.

#define START_ROWS 100 /* Each of these must be at least 1 */

#define ADD_ROWS 50

/* This function reads a matrix from a stream

* This routine never returns anything other than vectors and arrays

* that range from 0 to some number. */

int

fread_matrix(

FILE *fin,

float GPFAR * GPFAR * GPFAR * ret_matrix,

int *nr, int *nc,

float GPFAR * GPFAR * row_title,

float GPFAR * GPFAR * column_title)

{

float GPFAR * GPFAR * m, GPFAR * rt, GPFAR * ct;

int num_rows = START_ROWS;

size_t num_cols;

int current_row = 0;

float GPFAR * GPFAR * temp_array;

float fdummy;

if (fread(&fdummy, sizeof(fdummy), 1, fin) != 1)

return FALSE;

num_cols = (size_t) fdummy;

/* Choose a reasonable number of rows, allocate space for it and

* continue until this space runs out, then extend the matrix as

* necessary. */

ct = alloc_vector(0, num_cols - 1);

fread(ct, sizeof(*ct), num_cols, fin);

rt = alloc_vector(0, num_rows - 1);

m = matrix(0, num_rows - 1, 0, num_cols - 1);

while (fread(&rt[current_row], sizeof(rt[current_row]), 1, fin) == 1) {

/* We've got another row */

if (fread(m[current_row], sizeof(*(m[current_row])), num_cols, fin) != num_cols)

return (FALSE); /* Not a True matrix */

current_row++;

if (current_row >= num_rows) { /* We've got to make a bigger rowsize */

temp_array = extend_matrix(m, 0, num_rows - 1, 0, num_cols - 1,

num_rows + ADD_ROWS - 1, num_cols - 1);

rt = extend_vector(rt, 0, num_rows + ADD_ROWS - 1);

num_rows += ADD_ROWS;

m = temp_array;

}

/* finally we force the matrix to be the correct row size */

/* bug fixed. procedure called with incorrect 6th argument.

* jvdwoude@hut.nl */

temp_array = retract_matrix(m, 0, num_rows - 1, 0, num_cols - 1, current_row - 1, num_cols - 1);

/* Now save the things that change */

*ret_matrix = temp_array;

*row_title = retract_vector(rt, 0, current_row - 1);

*column_title = ct;

*nr = current_row; /* Really the total number of rows */

*nc = num_cols;

return (TRUE);

}

/* This writes a matrix to a stream

* Note that our ranges are inclusive ranges--and we can specify

* subsets. This behaves similarly to the xrange and yrange operators

* in gnuplot that we all are familiar with.

int

fwrite_matrix(

FILE *fout,

float GPFAR * GPFAR *m,

int nrl, int nrh, int ncl, int nch,

float GPFAR *row_title,

float GPFAR *column_title)

{

int j;

float length;

int col_length;

int status;

float GPFAR *title = NULL;

length = (float) (col_length = nch - ncl + 1);

if ((status = fwrite((char *) &length, sizeof(float), 1, fout)) != 1) {

fprintf(stderr, "fwrite 1 returned %d\n", status);

return (FALSE);

}

if (!column_title) {

column_title = title = alloc_vector(ncl, nch);

for (j = ncl; j <= nch; j++)

title[j] = (float) j;

}

fwrite((char *) column_title, sizeof(float), col_length, fout);

if (title) {

free_vector(title, ncl);

title = NULL;

}

if (!row_title) {

row_title = title = alloc_vector(nrl, nrh);

for (j = nrl; j <= nrh; j++)

title[j] = (float) j;

}

for (j = nrl; j <= nrh; j++) {

fwrite((char *) &row_title[j], sizeof(float), 1, fout);

fwrite((char *) (m[j] + ncl), sizeof(float), col_length, fout);

}

if (title)

free_vector(title, nrl);

return (TRUE);

}

/*===================== Support routines ==============================*/

/* ******************************* VECTOR *******************************

* The following routines interact with vectors.

* If there is an error we don't really return - int_error breaks us out.

* This subroutine based on a subroutine listed in "Numerical Recipies in C",

* by Press, Flannery, Teukoilsky and Vetterling (1988).

float GPFAR *

alloc_vector(int nl, int nh)

{

float GPFAR *vec;

if (! (vec = gp_alloc((nh - nl + 1) * sizeof(float), NULL))) {

int_error(NO_CARET, "not enough memory to create vector");

return NULL; /* Not reached */

}

return (vec - nl);

}

* Free a vector allocated above

* This subroutine based on a subroutine listed in "Numerical Recipies in C",

* by Press, Flannery, Teukoilsky and Vetterling (1988).

void

free_vector(float GPFAR *vec, int nl)

{

free(vec + nl);

}

/************ Routines to modify the length of a vector ****************/

float GPFAR *

extend_vector(float GPFAR *vec, int old_nl, int new_nh)

{

float GPFAR *new_v = gp_realloc((vec + old_nl),

(new_nh - old_nl + 1) * sizeof(new_v[0]),

"extend/retract vector");

return new_v - old_nl;

}

float GPFAR *

retract_vector(float GPFAR *v, int old_nl, int new_nh)

{

return extend_vector(v, old_nl, new_nh);

}

/* **************************** MATRIX ************************

* The following routines work with matricies

* I always get confused with this, so here I write it down:

* for nrl<= nri <=nrh and

* for ncl<= ncj <=nch

* This matrix is accessed as:

* matrix[nri][ncj];

* where nri is the offset to the pointer to a vector where the

* ncjth element lies.

* If there is an error we don't really return - int_error breaks us out.

* This subroutine based on a subroutine listed in "Numerical Recipies in C",

* by Press, Flannery, Teukoilsky and Vetterling (1988).

float GPFAR * GPFAR *

matrix(int nrl, int nrh, int ncl, int nch)

{

int i;

float GPFAR * GPFAR * m;

m = gp_alloc((nrh - nrl + 1) * sizeof(m[0]), "matrix rows");

m -= nrl;

for (i = nrl; i <= nrh; i++) {

if (!(m[i] = gp_alloc((nch - ncl + 1) * sizeof(m[i][0]), NULL))) {

free_matrix(m, nrl, i - 1, ncl);

int_error(NO_CARET, "not enough memory to create matrix");

return NULL;

}

m[i] -= ncl;

}

return m;

}

* Free a matrix allocated above

* This subroutine based on a subroutine listed in "Numerical Recipies in C",

* by Press, Flannery, Teukoilsky and Vetterling (1988).

void

free_matrix(

float GPFAR * GPFAR * m,

int nrl, int nrh, int ncl)

{

int i;

for (i = nrl; i <= nrh; i++)

free(m[i] + ncl);

free(m + nrl);

}

/* This routine takes a sub matrix and extends the number of rows and

* columns for a new matrix */

float GPFAR * GPFAR *

extend_matrix(

float GPFAR * GPFAR * a,

int nrl, int nrh, int ncl, int nch,

int srh, int sch)

{

int i;

float GPFAR * GPFAR * m;

m = gp_realloc(a + nrl, (srh - nrl + 1) * sizeof(m[0]),

"extend matrix");

m -= nrl;

if (sch != nch) {

for (i = nrl; i <= nrh; i++) { /* Copy and extend rows */

if (!(m[i] = extend_vector(m[i], ncl, sch))) {

free_matrix(m, nrl, nrh, ncl);

int_error(NO_CARET, "not enough memory to extend matrix");

return NULL;

}

for (i = nrh + 1; i <= srh; i++) {

if (!(m[i] = gp_alloc((nch - ncl + 1) * sizeof(m[i][0]), NULL))) {

free_matrix(m, nrl, i - 1, nrl);

int_error(NO_CARET, "not enough memory to extend matrix");

return NULL;

}

m[i] -= ncl;

}

return m;

}

/* this routine carves a large matrix down to size */

float GPFAR * GPFAR *

retract_matrix(

float GPFAR * GPFAR * a,

int nrl, int nrh, int ncl, int nch,

int srh, int sch)

{

int i;

float GPFAR * GPFAR * m;

for (i = srh + 1; i <= nrh; i++) {

free_vector(a[i], ncl);

}

m = gp_realloc(a + nrl, (srh - nrl + 1) * sizeof(m[0]),

"retract matrix");

m -= nrl;

if (sch != nch) {

for (i = nrl; i <= srh; i++)

if (!(m[i] = retract_vector(m[i], ncl, sch))) {

/* Shrink rows */

free_matrix(m, nrl, srh, ncl);

int_error(NO_CARET, "not enough memory to retract matrix");

return NULL;

}

return m;

}

/* allocate a float matrix m[nrl...nrh][ncl...nch] that points to the

matrix declared in the standard C manner as a[nrow][ncol], where

nrow=nrh-nrl+1, ncol=nch-ncl+1. The routine should be called with

the address &a[0][0] as the first argument. This routine does

not free the memory used by the original array a but merely assigns

pointers to the rows. */

float GPFAR * GPFAR *

convert_matrix(

float GPFAR *a,

int nrl, int nrh, int ncl, int nch)

{

int i, j, ncol, nrow;

float GPFAR * GPFAR * m;

nrow = nrh - nrl + 1;

ncol = nch - ncl + 1;

m = gp_alloc((nrh - nrl + 1) * sizeof(m[0]),

"convert_matrix");

m -= nrl;

m[nrl] = a - ncl;

for (i = 1, j = nrl + 1; i <= nrow - 1; i++, j++)

m[j] = m[j - 1] + ncol;

return m;

}

void

free_convert_matrix(float GPFAR * GPFAR * b, int nrl)

{

free(b + nrl);

}

gnuplot/src/binary.c at branch-4-2-stable · gnuplot/gnuplot · GitHub

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