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/*----------------------------------------------------------------------------
pamchannel
------------------------------------------------------------------------------
Part of the Netpbm package.
Extract specified channels (planes) from a PAM image
By Bryan Henderson, San Jose CA 2000.08.05
Contributed to the public domain by its author 2000.08.05.
-----------------------------------------------------------------------------*/
#include <string.h>
#include "pam.h"
#include "shhopt.h"
#include "mallocvar.h"
#define MAX_CHANNELS 16
/* The most channels we allow user to specify */
struct cmdlineInfo {
/* All the information the user supplied in the command line,
in a form easy for the program to use.
*/
const char * inputFileName; /* Filename of input files */
const char * tupletype; /* Tuple type for output PAM */
int n_channel;
/* The number of channels to extract. At least 1, at most 16. */
unsigned int channel_to_extract[MAX_CHANNELS];
/* The channel numbers to extract, in order. */
};
static void
parseCommandLine(int argc, char ** argv,
struct cmdlineInfo * const cmdlineP) {
/*----------------------------------------------------------------------------
Note that the file spec array we return is stored in the storage that
was passed to us as the argv array.
-----------------------------------------------------------------------------*/
optEntry *option_def;
/* Instructions to optParseOptions3 on how to parse our options.
*/
optStruct3 opt;
extern struct pam pam; /* Just so we can look at field sizes */
unsigned int option_def_index;
unsigned int infileSpec, tupletypeSpec;
MALLOCARRAY_NOFAIL(option_def, 100);
option_def_index = 0; /* incremented by OPTENT3 */
OPTENT3(0, "infile", OPT_STRING, &cmdlineP->inputFileName,
&infileSpec, 0);
OPTENT3(0, "tupletype", OPT_STRING, &cmdlineP->tupletype,
&tupletypeSpec, 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 */
optParseOptions3(&argc, argv, opt, sizeof(opt), 0);
/* Uses and sets argc, argv, and some of *cmdlineP and others. */
if (!infileSpec)
cmdlineP->inputFileName = "-";
if (!tupletypeSpec)
cmdlineP->tupletype = "";
else
if (strlen(cmdlineP->tupletype)+1 > sizeof(pam.tuple_type))
pm_error("Tuple type name specified is too long. Maximum of "
"%u characters allowed.", sizeof(pam.tuple_type));
cmdlineP->n_channel = 0; /* initial value */
{
int argn;
for (argn = 1; argn < argc; argn++) {
int n;
char *endptr;
if (cmdlineP->n_channel >= MAX_CHANNELS)
pm_error("You may not specify more than %d channels.",
MAX_CHANNELS);
n = strtol(argv[argn], &endptr, 10);
if (n < 0)
pm_error("Channel numbers cannot be negative. "
"You specified %d", n);
if (endptr == NULL)
pm_error("non-numeric channel number argument: '%s'",
argv[argn]);
cmdlineP->channel_to_extract[cmdlineP->n_channel++] = n;
}
}
if (cmdlineP->n_channel < 1)
pm_error("You must specify at least one channel to extract.");
}
static void
validateChannels(int const n_channel,
unsigned int const channels[],
int const depth) {
int i;
for (i = 0; i < n_channel; i++)
if (channels[i] > depth-1)
pm_error("You specified channel number %d. The highest numbered\n"
"channel in the input image is %d.",
channels[i], depth-1);
}
static void
doOneImage(FILE * const ifP,
FILE * const ofP,
unsigned int const nChannel,
unsigned int const channelToExtract[],
const char * const tupletype) {
struct pam inpam; /* Input PAM image */
struct pam outpam; /* Output PAM image */
pnm_readpaminit(ifP, &inpam, PAM_STRUCT_SIZE(tuple_type));
validateChannels(nChannel, channelToExtract, inpam.depth);
outpam = inpam; /* Initial value */
outpam.file = ofP;
outpam.depth = nChannel;
outpam.format = PAM_FORMAT;
strcpy(outpam.tuple_type, tupletype);
pnm_writepaminit(&outpam);
{
tuple * inrow;
tuple * outrow;
inrow = pnm_allocpamrow(&inpam);
outrow = pnm_allocpamrow(&outpam);
{
unsigned int row;
for (row = 0; row < inpam.height; ++row) {
unsigned int col;
pnm_readpamrow(&inpam, inrow);
for (col = 0; col < inpam.width; ++col) {
unsigned int plane;
for (plane = 0; plane < nChannel; ++plane)
outrow[col][plane] =
inrow[col][channelToExtract[plane]];
}
pnm_writepamrow(&outpam, outrow);
}
}
pnm_freepamrow(outrow);
pnm_freepamrow(inrow);
}
}
int
main(int argc, char *argv[]) {
struct cmdlineInfo cmdline;
FILE * ifP;
bool eof;
pnm_init(&argc, argv);
parseCommandLine(argc, argv, &cmdline);
ifP = pm_openr(cmdline.inputFileName);
eof = FALSE;
while (!eof) {
doOneImage(ifP, stdout, cmdline.n_channel, cmdline.channel_to_extract,
cmdline.tupletype);
pnm_nextimage(ifP, &eof);
}
pm_close(ifP);
return 0;
}
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