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/* ddbugtopbm - convert Diddle/DiddleBug sketch DB to PBM files.
* Copyright (c) 2002 Russell Marks. See COPYING for licence details.
*
* The decompression code (uncompress_sketch() is directly from
* DiddleBug itself, which like ddbugtopbm is distributed under the
* terms of the GNU GPL. As such, the following copyright applies to
* uncompress_sketch():
*
* Copyright (c) 1999,2000 Mitch Blevins <mblevin@debian.org>.
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Adapted to Netpbm by Bryan Henderson 2003.08.09. Bryan got his copy
* from ftp:ibiblio.com/pub/linux/apps/graphics/convert, dated 2002.08.21.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "pm_c_util.h"
#include "pbm.h"
#include "mallocvar.h"
/* this is basically UncompressSketch() from DiddleBug 2.50's diddlebug.c */
static void
uncompress_sketch(unsigned char * const cPtr,
unsigned char * const uPtr,
int const size) {
int i, j;
unsigned char num_bytes;
j = 0;
for (i=0; i<size; ++i) {
if (cPtr[i]&0x80) {
num_bytes = cPtr[i]&0x3f; /* ~(0x40|0x80) */
++num_bytes;
if (cPtr[i]&0x40) {
/* Mixed */
memmove(uPtr+j, cPtr+i+1, num_bytes);
i += num_bytes;
} else {
/* Black */
memset(uPtr+j, 0xff, num_bytes);
}
} else {
/* White */
num_bytes = cPtr[i]&0x7f; /* ~0x80 */
++num_bytes;
memset(uPtr+j, 0x00, num_bytes);
}
j += num_bytes;
}
}
static const char *
make_noname(void) {
static char name[128];
static int num=0;
FILE *out;
out = NULL;
do {
num++;
if (out != NULL)
fclose(out);
sprintf(name, "sketch-%04d.pbm", num);
} while (num<10000 && (out = fopen(name, "rb")) != NULL);
if (num>=10000)
pm_error("too many unnamed sketches!");
return(name);
}
int
main(int argc, char ** argv) {
FILE * const in=stdin;
static unsigned char buf[64*1024];
int *recoffsets;
int f;
int numrecs;
bool is_diddle;
pbm_init(&argc, argv);
if (argc-1 > 0)
pm_error("Program takes no arguments.");
/* main DB header */
fread(buf, 1, 64, in);
fread(buf, 1, 14, in);
if (memcmp(buf, "DIDL", 4) != 0 && memcmp(buf, "DIDB", 4) !=0 )
pm_error("not a Diddle or DiddleBug DB.");
is_diddle = (memcmp(buf, "DIDL", 4) == 0);
numrecs = buf[12]*256+buf[13];
MALLOCARRAY_NOFAIL(recoffsets, numrecs);
for (f = 0; f < numrecs; ++f) {
fread(buf, 1, 8, in);
recoffsets[f] = ((buf[0]<<24)|(buf[1]<<16)|(buf[2]<<8)|buf[3]);
}
for (f = 0; f < numrecs; ++f) {
static unsigned char obuf[64*1024];
char * nameptr;
char * ptr;
const char * outfilename;
FILE *out;
fseek(in, recoffsets[f], SEEK_SET);
fread(buf, 1, 16*1024, in); /* XXX crappy! */
if (is_diddle) {
/* Diddle */
memcpy(obuf, buf, 160*160/8);
nameptr=(char*)(buf+(160*160/8));
} else {
/* DiddleBug */
int const sketchlen = buf[8]*256+buf[9];
uncompress_sketch(buf+26+80+1, obuf, sketchlen-80-1);
nameptr = (char*)(buf+26+sketchlen);
}
for (ptr = nameptr; *ptr; ++ptr) {
if (!isalnum(*ptr) && strchr("()-_+=[]:;,.<>?",*ptr) == NULL)
*ptr='_';
if (isupper(*ptr))
*ptr = tolower(*ptr);
}
if (*nameptr==0)
outfilename = make_noname();
else {
strcat(nameptr, ".pbm");
outfilename = nameptr;
}
pm_message("extracting sketch %2d as `%s'", f, outfilename);
if((out=fopen(outfilename,"wb"))==NULL)
pm_message("WARNING: couldn't open file '%s'. Carrying on...",
outfilename);
else {
pbm_writepbminit(out, 160, 160, FALSE);
fwrite(obuf,1,160*160/8,out);
fclose(out);
}
}
return 0;
}
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