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- #ifndef lint
- static char *RCSid = "$Id: binary.c,v 1.10 1998/04/14 00:14:49 drd 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.
- *
- * Copyright (c) 1991,1992 Robert K. Cunningham, MIT Lincoln Laboratory
- *
- */
-
- #include "plot.h" /* We have to get TRUE and FALSE */
- #include "stdfn.h"
- #include "binary.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(fp)
- register FILE *fp;
- {
- register int i, len;
- register int odd; /* Contains a count of the odd characters */
- long where;
- register 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.
- */
-
- /*
- 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.
-
- */
- #define START_ROWS 100 /* Each of these must be at least 1 */
- #define ADD_ROWS 50
- int fread_matrix(fin, ret_matrix, nr, nc, row_title, column_title)
- FILE *fin;
- float GPFAR *GPFAR * GPFAR * ret_matrix, GPFAR * GPFAR * row_title,
- GPFAR * GPFAR * column_title;
- int *nr, *nc;
- {
- float GPFAR *GPFAR * m, GPFAR * rt, GPFAR * ct;
- register int num_rows = START_ROWS;
- register int num_cols;
- register int current_row = 0;
- register float GPFAR *GPFAR * temp_array;
- float fdummy;
-
- if (fread(&fdummy, sizeof(fdummy), 1, fin) != 1)
- return FALSE;
-
- num_cols = (int) 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 = vector(0, num_cols - 1);
- fread(ct, sizeof(*ct), num_cols, fin);
-
- rt = 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 - 1, 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, num_rows - 1, 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(fout, m, nrl, nrh, ncl, nch, row_title, column_title)
- register FILE *fout;
- register float GPFAR *GPFAR * m, GPFAR * row_title, GPFAR * column_title;
- register int nrl, nrh, ncl, nch;
- {
- register int j;
- float length;
- register int col_length;
- register 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 = 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, nch);
- title = NULL;
- }
- if (!row_title) {
- row_title = title = 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, nrh);
-
- 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 *vector(nl, nh)
- register int nl, nh;
- {
- register float GPFAR *vec;
-
- if (!(vec = (float GPFAR *) gp_alloc((unsigned long) (nh - nl + 1) * sizeof(float), NULL))) {
- int_error("not enough memory to create vector", NO_CARET);
- 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(vec, nl, nh)
- float GPFAR *vec;
- int nl, nh;
- {
- free(vec + nl);
- }
-
- /************ Routines to modify the length of a vector ****************/
- float GPFAR *
- extend_vector(vec, old_nl, old_nh, new_nh)
- float GPFAR *vec;
- register int old_nl, old_nh, new_nh;
- {
- register float GPFAR *new_v;
- new_v = (float GPFAR *) gp_realloc((void *) (vec + old_nl),
- (unsigned long) (new_nh - old_nl + 1) * sizeof(float),
- "extend vector");
- return new_v - old_nl;
- }
-
- float GPFAR *
- retract_vector(v, old_nl, old_nh, new_nh)
- float GPFAR *v;
- register int old_nl, old_nh, new_nh;
- {
- register float GPFAR *new_v;
- new_v = (float GPFAR *) gp_realloc((void *) (v + old_nl),
- (unsigned long) (new_nh - old_nl + 1) * sizeof(float), "retract vector");
- return new_v - old_nl;
- }
-
-
- /***************************** 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(nrl, nrh, ncl, nch)
- register int nrl, nrh, ncl, nch;
- {
- register int i;
- register float GPFAR *GPFAR * m;
-
- m = (float GPFAR * GPFAR *) gp_alloc((unsigned long) (nrh - nrl + 1) * sizeof(float GPFAR *), "matrix");
- m -= nrl;
-
- for (i = nrl; i <= nrh; i++) {
- if (!(m[i] = (float GPFAR *) gp_alloc((unsigned long) (nch - ncl + 1) * sizeof(float), NULL))) {
- free_matrix(m, nrl, i - 1, ncl, nch);
- int_error("not enough memory to create matrix", NO_CARET);
- 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(m, nrl, nrh, ncl, nch)
- float GPFAR *GPFAR * m;
- unsigned nrl, nrh, ncl, nch;
- {
- register unsigned int i;
-
- for (i = nrl; i <= nrh; i++)
- free((char GPFAR *) (m[i] + ncl));
- free((char GPFAR *) (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(a, nrl, nrh, ncl, nch, srh, sch)
- register float GPFAR *GPFAR * a;
- register int nrl, nrh, ncl, nch;
- register int srh, sch;
- {
- register int i;
- register float GPFAR *GPFAR * m;
-
- m = (float GPFAR * GPFAR *) gp_realloc((void *) (a + nrl), (unsigned long) (srh - nrl + 1) * sizeof(float GPFAR *), "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, nch, sch))) {
- free_matrix(m, nrl, nrh, ncl, sch);
- int_error("not enough memory to extend matrix", NO_CARET);
- return NULL;
- }
- }
- }
- for (i = nrh + 1; i <= srh; i++) {
- if (!(m[i] = (float GPFAR *) gp_alloc((unsigned long) (nch - ncl + 1) * sizeof(float), NULL))) {
- free_matrix(m, nrl, i - 1, nrl, sch);
- int_error("not enough memory to extend matrix", NO_CARET);
- return NULL;
- }
- m[i] -= ncl;
- }
- return m;
- }
- /*
- this routine carves a large matrix down to size
- */
- float GPFAR *GPFAR * retract_matrix(a, nrl, nrh, ncl, nch, srh, sch)
- register float GPFAR *GPFAR * a;
- register int nrl, nrh, ncl, nch;
- register int srh, sch;
- {
- register int i;
- register float GPFAR *GPFAR * m;
-
- for (i = srh + 1; i <= nrh; i++) {
- free_vector(a[i], ncl, nch);
- }
-
- m = (float GPFAR * GPFAR *) gp_realloc((void *) (a + nrl), (unsigned long) (srh - nrl + 1) * sizeof(float GPFAR *), "retract matrix");
-
- m -= nrl;
-
- if (sch != nch) {
- for (i = nrl; i <= srh; i++)
- if (!(m[i] = retract_vector(m[i], ncl, nch, sch))) { { /* Shrink rows */
- free_matrix(m, nrl, srh, ncl, sch);
- int_error("not enough memory to retract matrix", NO_CARET);
- return NULL;
- }
- }
- }
- return m;
- }
-
- float
- GPFAR *GPFAR * convert_matrix(a, nrl, nrh, ncl, nch)
- float GPFAR *a;
- register int nrl, nrh, ncl, nch;
-
- /* 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. */
-
- {
- register int i, j, ncol, nrow;
- register float GPFAR *GPFAR * m;
-
- nrow = nrh - nrl + 1;
- ncol = nch - ncl + 1;
- m = (float GPFAR * GPFAR *) gp_alloc((unsigned long) (nrh - nrl + 1) * sizeof(float GPFAR *), "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(b, nrl, nrh, ncl, nch)
- float GPFAR *GPFAR * b;
- register int nrl, nrh, ncl, nch;
- {
- free((char *) (b + nrl));
- }
-