/* ximtoppm.c - read an Xim file and produce a portable pixmap
**
** Copyright (C) 1991 by Jef Poskanzer.
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
** that the above copyright notice appear in all copies and that both that
** copyright notice and this permission notice appear in supporting
** documentation. This software is provided "as is" without express or
** implied warranty.
*/
#define _DEFAULT_SOURCE 1 /* New name for SVID & BSD source defines */
#define _BSD_SOURCE 1 /* Make sure strdup() is in string.h */
#define _XOPEN_SOURCE 500 /* Make sure strdup() is in string.h */
#include <string.h>
#include "pm_c_util.h"
#include "ppm.h"
#include "xim.h"
#include "shhopt.h"
#include "nstring.h"
struct cmdlineInfo {
/* All the information the user supplied in the command line,
in a form easy for the program to use.
*/
const char *input_filename;
const char *alpha_filename;
bool alpha_stdout;
};
static void
parseCommandLine(int argc, char ** argv,
struct cmdlineInfo *cmdlineP) {
/*----------------------------------------------------------------------------
Note that many of the strings that this function returns in the
*cmdlineP structure are actually in the supplied argv array. And
sometimes, one of these strings is actually just a suffix of an entry
in argv!
-----------------------------------------------------------------------------*/
optEntry option_def[100];
optStruct3 opt;
unsigned int option_def_index;
unsigned int alphaoutSpec;
option_def_index = 0; /* incremented by OPTENT3 */
OPTENT3(0, "alphaout", OPT_STRING,
&cmdlineP->alpha_filename, &alphaoutSpec, 0);
opt.opt_table = option_def;
opt.short_allowed = FALSE; /* We have no short (old-fashioned) options */
opt.allowNegNum = FALSE; /* We have no parms that are negative numbers */
pm_optParseOptions3(&argc, argv, opt, sizeof(opt), 0);
/* Uses and sets argc, argv, and all of *cmdlineP. */
if (!alphaoutSpec)
cmdlineP->alpha_filename = NULL;
if (argc - 1 == 0)
cmdlineP->input_filename = "-"; /* he wants stdin */
else if (argc - 1 == 1)
cmdlineP->input_filename = strdup(argv[1]);
else
pm_error("Too many arguments. The only argument accepted "
"is the input file specification");
if (cmdlineP->alpha_filename &&
streq(cmdlineP->alpha_filename, "-"))
cmdlineP->alpha_stdout = TRUE;
else
cmdlineP->alpha_stdout = FALSE;
}
/* The subroutines are excerpted and slightly modified from the
X.V11R4 version of xim_io.c.
*/
static int
ReadXimHeader(FILE * const in_fp,
XimImage * const header) {
int i;
char *cp;
XimAsciiHeader a_head;
cp = (char *) header;
for (i = 0; i < sizeof(XimImage); ++i )
*cp++ = 0;
/* Read header and verify image file formats */
if (fread((char *)&a_head, sizeof(ImageHeader), 1, in_fp) != 1) {
pm_message("ReadXimHeader: unable to read file header" );
return(0);
}
if (atoi(a_head.header_size) != sizeof(ImageHeader)) {
pm_message("ReadXimHeader: header size mismatch" );
return(0);
}
if (atoi(a_head.file_version) != IMAGE_VERSION) {
pm_message("ReadXimHeader: incorrect Image_file version" );
return(0);
}
header->width = atoi(a_head.image_width);
header->height = atoi(a_head.image_height);
header->ncolors = atoi(a_head.num_colors);
header->nchannels = atoi(a_head.num_channels);
header->bytes_per_line = atoi(a_head.bytes_per_line);
/* header->npics = atoi(a_head.num_pictures);
*/
header->bits_channel = atoi(a_head.bits_per_channel);
header->alpha_flag = atoi(a_head.alpha_channel);
header->author = pm_strdup(a_head.author);
header->date = pm_strdup(a_head.date);
header->program = pm_strdup(a_head.program);
/* Do double checking for bakwards compatibility */
if (header->npics == 0)
header->npics = 1;
if (header->bits_channel == 0)
header->bits_channel = 8;
else if (header->bits_channel == 24) {
header->nchannels = 3;
header->bits_channel = 8;
}
if ((int)header->bytes_per_line == 0)
header->bytes_per_line =
(header->bits_channel == 1 && header->nchannels == 1) ?
(header->width + 7) / 8 :
header->width;
header->datasize =(unsigned int)header->bytes_per_line * header->height;
if (header->nchannels == 3 && header->bits_channel == 8)
header->ncolors = 0;
else if (header->nchannels == 1 && header->bits_channel == 8) {
header->colors = (Color *)calloc((unsigned int)header->ncolors,
sizeof(Color));
if (header->colors == NULL) {
pm_message("ReadXimHeader: can't calloc colors" );
return(0);
}
for (i=0; i < header->ncolors; i++) {
header->colors[i].red = a_head.c_map[i][0];
header->colors[i].grn = a_head.c_map[i][1];
header->colors[i].blu = a_head.c_map[i][2];
}
}
return(1);
}
static int
ReadImageChannel(FILE * const infp,
byte * const buf,
unsigned int * const bufsize,
int const encoded) {
int i, runlen, nbytes;
unsigned int j;
byte *line;
long marker;
if (!encoded)
j = fread((char *)buf, 1, (int)*bufsize, infp);
else {
if ((line=(byte *)malloc((unsigned int)BUFSIZ)) == NULL) {
pm_message("ReadImageChannel: can't malloc() fread string" );
return(0);
}
/* Unrunlength encode data */
marker = ftell(infp);
j = 0;
while (((nbytes=fread((char *)line, 1, BUFSIZ, infp)) > 0) &&
(j < *bufsize)) {
for (i=0; (i < nbytes) && (j < *bufsize); i++) {
runlen = (int)line[i]+1;
i++;
while (runlen--)
buf[j++] = line[i];
}
marker += i;
}
/* return to the beginning of the next image's bufffer */
if (fseek(infp, marker, 0) == -1) {
pm_message("ReadImageChannel: can't fseek to location in image buffer" );
return(0);
}
free((char *)line);
}
if (j != *bufsize) {
pm_message("unable to complete channel: %u / %u (%d%%)",
j, *bufsize, (int)(j*100.0 / *bufsize) );
*bufsize = j;
}
return(1);
}
static int
ReadXimImage(FILE * const in_fp,
XimImage * const xim) {
if (xim->data) {
free((char *)xim->data);
xim->data = (byte *)0;
}
if (xim->grn_data) {
free((char *)xim->grn_data);
xim->grn_data = (byte *)0;
}
if (xim->blu_data) {
free((char *)xim->blu_data);
xim->blu_data = (byte *)0;
}
if (xim->other) {
free((char *)xim->other);
xim->other = (byte *)0;
}
xim->npics = 0;
if (!(xim->data = (byte *)calloc(xim->datasize, 1))) {
pm_message("ReadXimImage: can't malloc pixmap data" );
return(0);
}
if (!ReadImageChannel(in_fp, xim->data, &xim->datasize, 0)) {
pm_message("ReadXimImage: end of the images" );
return(0);
}
if (xim->nchannels == 3) {
xim->grn_data = (byte *)malloc(xim->datasize);
xim->blu_data = (byte *)malloc(xim->datasize);
if (xim->grn_data == NULL || xim->blu_data == NULL) {
pm_message("ReadXimImage: can't malloc rgb channel data" );
free((char *)xim->data);
if (xim->grn_data) free((char *)xim->grn_data);
if (xim->blu_data) free((char *)xim->blu_data);
xim->data = xim->grn_data = xim->blu_data = (byte*)0;
return(0);
}
if (!ReadImageChannel(in_fp, xim->grn_data, &xim->datasize, 0))
return(0);
if (!ReadImageChannel(in_fp, xim->blu_data, &xim->datasize, 0))
return(0);
}
if (xim->nchannels > 3) {
/* In theory, this can be any fourth channel, but the only one we
know about is an Alpha channel, so we'll call it that, even
though we process it generically.
*/
if ((xim->other = (byte *)malloc(xim->datasize)) == NULL) {
pm_message("ReadXimImage: can't malloc alpha data" );
return(0);
}
if (!ReadImageChannel(in_fp, xim->other, &xim->datasize, 0))
return(0);
}
xim->npics = 1;
return(1);
}
/***********************************************************************
* File: xlib.c
* Author: Philip Thompson
* $Date: 89/11/01 10:14:23 $
* $Revision: 1.14 $
* Purpose: General xim libray of utililities
* Copyright (c) 1988 Philip R. Thompson
* Computer Resource Laboratory (CRL)
* Dept. of Architecture and Planning
* M.I.T., Rm 9-526
* Cambridge, MA 02139
* This software and its documentation may be used, copied, modified,
* and distributed for any purpose without fee, provided:
* -- The above copyright notice appears in all copies.
* -- This disclaimer appears in all source code copies.
* -- The names of M.I.T. and the CRL are not used in advertising
* or publicity pertaining to distribution of the software
* without prior specific written permission from me or CRL.
* I provide this software freely as a public service. It is NOT a
* commercial product, and therefore is not subject to an an implied
* warranty of merchantability or fitness for a particular purpose. I
* provide it as is, without warranty.
* This software is furnished only on the basis that any party who
* receives it indemnifies and holds harmless the parties who furnish
* it against any claims, demands, or liabilities connected with using
* it, furnishing it to others, or providing it to a third party.
*
***********************************************************************/
static int
ReadXim(in_fp, xim)
FILE *in_fp;
XimImage *xim;
{
if (!ReadXimHeader(in_fp, xim)) {
pm_message("can't read xim header" );
return(0);
}
if (!ReadXimImage(in_fp, xim)) {
pm_message("can't read xim data" );
return(0);
}
return(1);
}
int
main(int argc,
char *argv[]) {
struct cmdlineInfo cmdline;
FILE *ifP, *imageout_file, *alpha_file;
XimImage xim;
pixel *pixelrow, colormap[256];
gray *alpharow;
/* The alpha channel of the row we're currently converting, in
pgm fmt
*/
int rows, cols, row, mapped;
pixval maxval;
bool success;
ppm_init(&argc, argv);
parseCommandLine(argc, argv, &cmdline);
ifP = pm_openr(cmdline.input_filename);
if (cmdline.alpha_stdout)
alpha_file = stdout;
else if (cmdline.alpha_filename == NULL)
alpha_file = NULL;
else
alpha_file = pm_openw(cmdline.alpha_filename);
if (cmdline.alpha_stdout)
imageout_file = NULL;
else
imageout_file = stdout;
success = ReadXim(ifP, &xim);
if (!success)
pm_error("can't read Xim file");
rows = xim.height;
cols = xim.width;
if (xim.nchannels == 1 && xim.bits_channel == 8) {
int i;
mapped = true;
maxval = 255;
for (i = 0; i < xim.ncolors; ++i) {
PPM_ASSIGN(
colormap[i], xim.colors[i].red,
xim.colors[i].grn, xim.colors[i].blu );
/* Should be colormap[xim.colors[i].pixel], but Xim is broken. */
}
} else if (xim.nchannels == 3 || xim.nchannels == 4) {
mapped = false;
maxval = pm_bitstomaxval(xim.bits_channel);
} else
pm_error(
"unknown Xim file type, nchannels == %d, bits_channel == %d",
xim.nchannels, xim.bits_channel);
if (imageout_file)
ppm_writeppminit(imageout_file, cols, rows, maxval, 0);
if (alpha_file)
pgm_writepgminit(alpha_file, cols, rows, maxval, 0);
pixelrow = ppm_allocrow(cols);
alpharow = pgm_allocrow(cols);
for (row = 0; row < rows; ++row) {
if (mapped) {
byte * const ximrow = xim.data + row * xim.bytes_per_line;
unsigned int col;
for (col = 0; col < cols; ++col)
pixelrow[col] = colormap[ximrow[col]];
alpharow[col] = 0;
} else {
byte * const redrow = xim.data + row * xim.bytes_per_line;
byte * const grnrow = xim.grn_data + row * xim.bytes_per_line;
byte * const blurow = xim.blu_data + row * xim.bytes_per_line;
byte * const othrow = xim.other + row * xim.bytes_per_line;
unsigned int col;
for (col = 0; col < cols; ++col) {
PPM_ASSIGN(pixelrow[col],
redrow[col], grnrow[col], blurow[col]);
if (xim.nchannels > 3)
alpharow[col] = othrow[col];
else
alpharow[col] = 0;
}
}
if (imageout_file)
ppm_writeppmrow(imageout_file, pixelrow, cols, maxval, 0);
if (alpha_file)
pgm_writepgmrow(alpha_file, alpharow, cols, maxval, 0);
}
pm_close(ifP);
if (imageout_file)
pm_close(imageout_file);
if (alpha_file)
pm_close(alpha_file);
return 0;
}
