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OS/2 Shareware BBS: 11 Util
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11-Util.zip
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xicon05.zip
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readxbm.c
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C/C++ Source or Header
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1993-05-06
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6KB
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224 lines
/* Copyright, 1987, Massachusetts Institute of Technology */
/* Slightly modified by Norman Walsh for XIcon. I believe */
/* that this file is free within the context of the X11 */
/* Consortium. */
#if 0
#include "copyright.h"
#endif
/*
* Code to read bitmaps from disk files. Interprets
* data from X10 and X11 bitmap files and creates
* Pixmap representations of files. Returns Pixmap
* ID and specifics about image.
*
* Modified for speedup by Jim Becker, changed image
* data parsing logic (removed some fscanf()s).
* Aug 5, 1988
*
* Note that this file and ../Xmu/RdBitF.c look very similar.... Keep them
* that way (but don't use common source code so that people can have one
* without the other).
*/
#include <stdio.h>
#include <ctype.h>
#include "iconio.h"
typedef int Bool;
#define True 1
#define False 0
char *rindex();
#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;
}
int ReadXBM (input, width, height, data)
FILE *input;
unsigned int *width, *height; /* RETURNED */
char *data[]; /* RETURNED */
{
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 */
/* 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, input)) {
if (strlen(line) == MAX_SIZE-1) {
RETURN (-1);
}
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 (-1);
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 = (char *) malloc ((unsigned int) size);
if (!*data)
RETURN (-1);
if (version10p) {
unsigned char *ptr;
int bytes;
for (bytes=0, ptr= (unsigned char *) *data;
bytes<size; (bytes += 2)) {
if ((value = NextInt(input)) < 0)
RETURN (-1);
*(ptr++) = value;
if (!padding || ((bytes+2) % bytes_per_line))
*(ptr++) = value >> 8;
}
} else {
unsigned char *ptr;
int bytes;
for (bytes=0, ptr= (unsigned char *) *data;
bytes<size; bytes++, ptr++) {
if ((value = NextInt(input)) < 0)
RETURN (-1);
*ptr=value;
}
}
} /* end while */
if (*data == NULL) {
RETURN (-1);
}
*width = ww;
*height = hh;
return 0;
}