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DEFINITIONS
This source file includes following definitions.
- getmbi
- putmbi
- skipheader
- createwbmp
- readwbmp
- writewbmp
- freewbmp
- printwbmp
- putout
- getin
- main
/* WBMP
** ----
** WBMP Level 0: B/W, Uncompressed
** This implements the WBMP format as specified in WAPSpec 1.1 and 1.2.
** It does not support ExtHeaders as defined in the spec. The spec states
** that a WAP client does not need to implement ExtHeaders.
**
** (c) 2000 Johan Van den Brande <johan@vandenbrande.com>
*/
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include "wbmp.h"
#include "gd.h"
#include "gdhelpers.h"
#ifdef NOTDEF
#define __TEST /* Compile with main function */
#define __DEBUG /* Extra verbose when with __TEST */
#define __WRITE /* readwbmp and writewbmp(stdout) */
#define __VIEW /* view the wbmp on stdout */
#endif
/* getmbi
** ------
** Get a multibyte integer from a generic getin function
** 'getin' can be getc, with in = NULL
** you can find getin as a function just above the main function
** This way you gain a lot of flexibilty about how this package
** reads a wbmp file.
*/
int
getmbi (int (*getin) (void *in), void *in)
{
int i, mbi = 0;
do
{
i = getin (in);
if (i < 0)
return (-1);
mbi = (mbi << 7) | (i & 0x7f);
}
while (i & 0x80);
return (mbi);
}
/* putmbi
** ------
** Put a multibyte intgerer in some kind of output stream
** I work here with a function pointer, to make it as generic
** as possible. Look at this function as an iterator on the
** mbi integers it spits out.
**
*/
void
putmbi (int i, void (*putout) (int c, void *out), void *out)
{
int cnt, l, accu;
/* Get number of septets */
cnt = 0;
accu = 0;
while (accu != i)
accu += i & 0x7f << 7 * cnt++;
/* Produce the multibyte output */
for (l = cnt - 1; l > 0; l--)
putout (0x80 | (i & 0x7f << 7 * l) >> 7 * l, out);
putout (i & 0x7f, out);
}
/* skipheader
** ----------
** Skips the ExtHeader. Not needed for the moment
**
*/
int
skipheader (int (*getin) (void *in), void *in)
{
int i;
do
{
i = getin (in);
if (i < 0)
return (-1);
}
while (i & 0x80);
return (0);
}
/* create wbmp
** -----------
** create an empty wbmp
**
*/
Wbmp *
createwbmp (int width, int height, int color)
{
int i;
Wbmp *wbmp;
if ((wbmp = (Wbmp *) gdMalloc (sizeof (Wbmp))) == NULL)
return (NULL);
if (overflow2(sizeof (int), width)) {
gdFree(wbmp);
return NULL;
}
if (overflow2(sizeof (int) * width, height)) {
gdFree(wbmp);
return NULL;
}
if ((wbmp->bitmap = (int *) safe_emalloc(sizeof(int), width * height, 0)) == NULL)
{
gdFree (wbmp);
return (NULL);
}
wbmp->width = width;
wbmp->height = height;
for (i = 0; i < width * height; wbmp->bitmap[i++] = color);
return (wbmp);
}
/* readwbmp
** -------
** Actually reads the WBMP format from an open file descriptor
** It goes along by returning a pointer to a WBMP struct.
**
*/
int
readwbmp (int (*getin) (void *in), void *in, Wbmp ** return_wbmp)
{
int row, col, byte, pel, pos;
Wbmp *wbmp;
if ((wbmp = (Wbmp *) gdMalloc (sizeof (Wbmp))) == NULL)
return (-1);
wbmp->type = getin (in);
if (wbmp->type != 0)
{
gdFree (wbmp);
return (-1);
}
if (skipheader (getin, in))
return (-1);
wbmp->width = getmbi (getin, in);
if (wbmp->width == -1)
{
gdFree (wbmp);
return (-1);
}
wbmp->height = getmbi (getin, in);
if (wbmp->height == -1)
{
gdFree (wbmp);
return (-1);
}
#ifdef __DEBUG
printf ("W: %d, H: %d\n", wbmp->width, wbmp->height);
#endif
if (overflow2(sizeof (int), wbmp->width) ||
overflow2(sizeof (int) * wbmp->width, wbmp->height))
{
gdFree(wbmp);
return (-1);
}
if ((wbmp->bitmap = (int *) safe_emalloc((size_t)wbmp->width * wbmp->height, sizeof(int), 0)) == NULL)
{
gdFree (wbmp);
return (-1);
}
#ifdef __DEBUG
printf ("DATA CONSTRUCTED\n");
#endif
pos = 0;
for (row = 0; row < wbmp->height; row++)
{
for (col = 0; col < wbmp->width;)
{
byte = getin (in);
for (pel = 7; pel >= 0; pel--)
{
if (col++ < wbmp->width)
{
if (byte & 1 << pel)
{
wbmp->bitmap[pos] = WBMP_WHITE;
}
else
{
wbmp->bitmap[pos] = WBMP_BLACK;
}
pos++;
}
}
}
}
*return_wbmp = wbmp;
return (0);
}
/* writewbmp
** ---------
** Write a wbmp to a file descriptor
**
** Why not just giving a filedescriptor to this function?
** Well, the incentive to write this function was the complete
** integration in gd library from www.boutell.com. They use
** their own io functions, so the passing of a function seemed to be
** a logic(?) decision ...
**
*/
int
writewbmp (Wbmp * wbmp, void (*putout) (int c, void *out), void *out)
{
int row, col;
int bitpos, octet;
/* Generate the header */
putout (0, out); /* WBMP Type 0: B/W, Uncompressed bitmap */
putout (0, out); /* FixHeaderField */
/* Size of the image */
putmbi (wbmp->width, putout, out); /* width */
putmbi (wbmp->height, putout, out); /* height */
/* Image data */
for (row = 0; row < wbmp->height; row++)
{
bitpos = 8;
octet = 0;
for (col = 0; col < wbmp->width; col++)
{
octet |= ((wbmp->bitmap[row * wbmp->width + col] == 1) ? WBMP_WHITE : WBMP_BLACK) << --bitpos;
if (bitpos == 0)
{
bitpos = 8;
putout (octet, out);
octet = 0;
}
}
if (bitpos != 8)
putout (octet, out);
}
return (0);
}
/* freewbmp
** --------
** gdFrees up memory occupied by a WBMP structure
**
*/
void
freewbmp (Wbmp * wbmp)
{
gdFree (wbmp->bitmap);
gdFree (wbmp);
}
/* printwbmp
** ---------
** print a WBMP to stdout for visualisation
**
*/
void
printwbmp (Wbmp * wbmp)
{
int row, col;
for (row = 0; row < wbmp->height; row++)
{
for (col = 0; col < wbmp->width; col++)
{
if (wbmp->bitmap[wbmp->width * row + col] == WBMP_BLACK)
{
putchar ('#');
}
else
{
putchar (' ');
}
}
putchar ('\n');
}
}
#ifdef __TEST
/* putout to file descriptor
** -------------------------
*/
int
putout (int c, void *out)
{
return (putc (c, (FILE *) out));
}
/* getin from file descriptor
** --------------------------
*/
int
getin (void *in)
{
return (getc ((FILE *) in));
}
/* Main function
** -------------
**
*/
int
main (int argc, char *argv[])
{
FILE *wbmp_file;
Wbmp *wbmp;
wbmp_file = fopen (argv[1], "rb");
if (wbmp_file)
{
readwbmp (&getin, wbmp_file, &wbmp);
#ifdef __VIEW
#ifdef __DEBUG
printf ("\nVIEWING IMAGE\n");
#endif
printwbmp (wbmp);
#endif
#ifdef __WRITE
#ifdef __DEBUG
printf ("\nDUMPING WBMP to STDOUT\n");
#endif
writewbmp (wbmp, &putout, stdout);
#endif
freewbmp (wbmp);
fclose (wbmp_file);
}
}
#endif