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- /*
- * $XConsortium: RdBitF.c,v 1.8 91/03/09 16:27:55 rws Exp $
- *
- * Copyright 1988 Massachusetts Institute of Technology
- *
- * Permission to use, copy, modify, distribute, and sell this software and its
- * documentation for any purpose is hereby granted without fee, provided that
- * the above copyright notice appear in all copies and that both that
- * copyright notice and this permission notice appear in supporting
- * documentation, and that the name of M.I.T. not be used in advertising or
- * publicity pertaining to distribution of the software without specific,
- * written prior permission. M.I.T. makes no representations about the
- * suitability of this software for any purpose. It is provided "as is"
- * without express or implied warranty.
- *
- * M.I.T. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL M.I.T.
- * BE LIABLE FOR 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.
- *
- *
- * This file contains miscellaneous utility routines and is not part of the
- * Xlib standard.
- *
- * Public entry points:
- *
- * XmuReadBitmapData read data from FILE descriptor
- * XmuReadBitmapDataFromFile read X10 or X11 format bitmap files
- * and return data
- *
- * Note that this file and ../X/XRdBitF.c look very similar.... Keep them
- * that way (but don't use common source code so that people can have one
- * without the other).
- */
-
-
- /*
- * Based on an optimized version provided by Jim Becker, Auguest 5, 1988.
- */
-
- #include <X11/Xos.h>
- #include <X11/Xlib.h>
- #include <X11/Xutil.h>
- #include <stdio.h>
- #include <ctype.h>
-
-
- #define MAX_SIZE 255
-
- /* shared data for the image read/parse logic */
- static short hexTable[256]; /* conversion value */
- static Bool initialized = False; /* easier to fill in at run time */
-
-
- /*
- * Table index for the hex values. Initialized once, first time.
- * Used for translation value or delimiter significance lookup.
- */
- static void initHexTable()
- {
- /*
- * We build the table at run time for several reasons:
- *
- * 1. portable to non-ASCII machines.
- * 2. still reentrant since we set the init flag after setting table.
- * 3. easier to extend.
- * 4. less prone to bugs.
- */
- hexTable['0'] = 0; hexTable['1'] = 1;
- hexTable['2'] = 2; hexTable['3'] = 3;
- hexTable['4'] = 4; hexTable['5'] = 5;
- hexTable['6'] = 6; hexTable['7'] = 7;
- hexTable['8'] = 8; hexTable['9'] = 9;
- hexTable['A'] = 10; hexTable['B'] = 11;
- hexTable['C'] = 12; hexTable['D'] = 13;
- hexTable['E'] = 14; hexTable['F'] = 15;
- hexTable['a'] = 10; hexTable['b'] = 11;
- hexTable['c'] = 12; hexTable['d'] = 13;
- hexTable['e'] = 14; hexTable['f'] = 15;
-
- /* delimiters of significance are flagged w/ negative value */
- hexTable[' '] = -1; hexTable[','] = -1;
- hexTable['}'] = -1; hexTable['\n'] = -1;
- hexTable['\t'] = -1;
-
- initialized = True;
- }
-
- /*
- * read next hex value in the input stream, return -1 if EOF
- */
- static NextInt (fstream)
- FILE *fstream;
- {
- int ch;
- int value = 0;
- int gotone = 0;
- int done = 0;
-
- /* loop, accumulate hex value until find delimiter */
- /* skip any initial delimiters found in read stream */
-
- while (!done) {
- ch = getc(fstream);
- if (ch == EOF) {
- value = -1;
- done++;
- } else {
- /* trim high bits, check type and accumulate */
- ch &= 0xff;
- if (isascii(ch) && isxdigit(ch)) {
- value = (value << 4) + hexTable[ch];
- gotone++;
- } else if ((hexTable[ch]) < 0 && gotone)
- done++;
- }
- }
- return value;
- }
-
-
- /*
- * The data returned by the following routine is always in left-most byte
- * first and left-most bit first. If it doesn't return BitmapSuccess then
- * its arguments won't have been touched. This routine should look as much
- * like the Xlib routine XReadBitmapfile as possible.
- */
- int XmuReadBitmapData (fstream, width, height, datap, x_hot, y_hot)
- FILE *fstream; /* handle on file */
- unsigned int *width, *height; /* RETURNED */
- unsigned char **datap; /* RETURNED */
- int *x_hot, *y_hot; /* RETURNED */
- {
- unsigned char *data = NULL; /* working variable */
- char line[MAX_SIZE]; /* input line from file */
- int size; /* number of bytes of data */
- char name_and_type[MAX_SIZE]; /* an input line */
- char *type; /* for parsing */
- int value; /* from an input line */
- int version10p; /* boolean, old format */
- int padding; /* to handle alignment */
- int bytes_per_line; /* per scanline of data */
- unsigned int ww = 0; /* width */
- unsigned int hh = 0; /* height */
- int hx = -1; /* x hotspot */
- int hy = -1; /* y hotspot */
-
- #define Xmalloc(size) malloc(size)
-
- /* first time initialization */
- if (initialized == False) initHexTable();
-
- /* error cleanup and return macro */
- #define RETURN(code) { if (data) free (data); return code; }
-
- while (fgets(line, MAX_SIZE, fstream)) {
- if (strlen(line) == MAX_SIZE-1) {
- RETURN (BitmapFileInvalid);
- }
- if (sscanf(line,"#define %s %d",name_and_type,&value) == 2) {
- if (!(type = rindex(name_and_type, '_')))
- type = name_and_type;
- else
- type++;
-
- if (!strcmp("width", type))
- ww = (unsigned int) value;
- if (!strcmp("height", type))
- hh = (unsigned int) value;
- if (!strcmp("hot", type)) {
- if (type-- == name_and_type || type-- == name_and_type)
- continue;
- if (!strcmp("x_hot", type))
- hx = value;
- if (!strcmp("y_hot", type))
- hy = value;
- }
- continue;
- }
-
- if (sscanf(line, "static short %s = {", name_and_type) == 1)
- version10p = 1;
- else if (sscanf(line,"static unsigned char %s = {",name_and_type) == 1)
- version10p = 0;
- else if (sscanf(line, "static char %s = {", name_and_type) == 1)
- version10p = 0;
- else
- continue;
-
- if (!(type = rindex(name_and_type, '_')))
- type = name_and_type;
- else
- type++;
-
- if (strcmp("bits[]", type))
- continue;
-
- if (!ww || !hh)
- RETURN (BitmapFileInvalid);
-
- if ((ww % 16) && ((ww % 16) < 9) && version10p)
- padding = 1;
- else
- padding = 0;
-
- bytes_per_line = (ww+7)/8 + padding;
-
- size = bytes_per_line * hh;
- data = (unsigned char *) Xmalloc ((unsigned int) size);
- if (!data)
- RETURN (BitmapNoMemory);
-
- if (version10p) {
- unsigned char *ptr;
- int bytes;
-
- for (bytes=0, ptr=data; bytes<size; (bytes += 2)) {
- if ((value = NextInt(fstream)) < 0)
- RETURN (BitmapFileInvalid);
- *(ptr++) = value;
- if (!padding || ((bytes+2) % bytes_per_line))
- *(ptr++) = value >> 8;
- }
- } else {
- unsigned char *ptr;
- int bytes;
-
- for (bytes=0, ptr=data; bytes<size; bytes++, ptr++) {
- if ((value = NextInt(fstream)) < 0)
- RETURN (BitmapFileInvalid);
- *ptr=value;
- }
- }
- break;
- } /* end while */
-
- if (data == NULL) {
- RETURN (BitmapFileInvalid);
- }
-
- *datap = data;
- data = NULL;
- *width = ww;
- *height = hh;
- if (x_hot) *x_hot = hx;
- if (y_hot) *y_hot = hy;
-
- RETURN (BitmapSuccess);
- }
-
-
- #if NeedFunctionPrototypes
- int XmuReadBitmapDataFromFile (_Xconst char *filename, unsigned int *width,
- unsigned int *height, unsigned char **datap,
- int *x_hot, int *y_hot)
- #else
- int XmuReadBitmapDataFromFile (filename, width, height, datap, x_hot, y_hot)
- char *filename;
- unsigned int *width, *height; /* RETURNED */
- unsigned char **datap; /* RETURNED */
- int *x_hot, *y_hot; /* RETURNED */
- #endif
- {
- FILE *fstream;
- int status;
-
- if ((fstream = fopen (filename, "r")) == NULL) {
- return BitmapOpenFailed;
- }
- status = XmuReadBitmapData (fstream, width, height, datap, x_hot, y_hot);
- fclose (fstream);
- return status;
- }
-