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/*============================================================================
pamfixtrunc
==============================================================================
Fix a Netpbm image that has been truncated, e.g. by I/O error.
By Bryan Henderson, January 2007.
Contributed to the public domain by its author.
============================================================================*/
#include <setjmp.h>
#include "pam.h"
#include "shhopt.h"
#include "mallocvar.h"
struct cmdlineInfo {
/* All the information the user supplied in the command line,
in a form easy for the program to use.
*/
const char * inputFilespec; /* Filespec of input file */
unsigned int verbose;
};
static void
parseCommandLine(int argc, char ** const 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;
optStruct3 opt;
unsigned int option_def_index;
MALLOCARRAY(option_def, 100);
option_def_index = 0; /* incremented by OPTENTRY */
OPTENT3(0, "verbose", OPT_FLAG, NULL, &cmdlineP->verbose, 0);
opt.opt_table = option_def;
opt.short_allowed = FALSE; /* We have no short (old-fashioned) options */
opt.allowNegNum = FALSE; /* We don't parms that are negative numbers */
optParseOptions3(&argc, argv, opt, sizeof(opt), 0);
/* Uses and sets argc, argv, and some of *cmdlineP and others. */
if (argc-1 == 0)
cmdlineP->inputFilespec = "-";
else if (argc-1 != 1)
pm_error("Program takes zero or one argument (filename). You "
"specified %d", argc-1);
else
cmdlineP->inputFilespec = argv[1];
}
static unsigned int readErrRow;
static bool readErrVerbose;
static pm_usererrormsgfn discardMsg;
static void
discardMsg(const char * const msg) {
if (readErrVerbose)
pm_message("Error reading row %u: %s", readErrRow, msg);
}
static void
countRows(const struct pam * const inpamP,
bool const verbose,
unsigned int * const goodRowCountP) {
tuple * tuplerow;
unsigned int row;
jmp_buf jmpbuf;
int rc;
unsigned int goodRowCount;
tuplerow = pnm_allocpamrow(inpamP);
pm_setusererrormsgfn(discardMsg);
rc = setjmp(jmpbuf);
if (rc == 0) {
pm_setjmpbuf(&jmpbuf);
readErrVerbose = verbose;
goodRowCount = 0; /* initial value */
for (row = 0; row < inpamP->height; ++row) {
readErrRow = row;
pnm_readpamrow(inpamP, tuplerow);
/* The above does not return if it can't read the next row from
the file. Instead, it longjmps out of this loop.
*/
++goodRowCount;
}
}
*goodRowCountP = goodRowCount;
pnm_freepamrow(tuplerow);
}
static void
copyGoodRows(const struct pam * const inpamP,
FILE * const ofP,
unsigned int const goodRowCount) {
struct pam outpam;
tuple * tuplerow;
unsigned int row;
outpam = *inpamP; /* initial value */
outpam.file = ofP;
outpam.height = goodRowCount;
tuplerow = pnm_allocpamrow(inpamP);
pnm_writepaminit(&outpam);
for (row = 0; row < outpam.height; ++row) {
pnm_readpamrow(inpamP, tuplerow);
pnm_writepamrow(&outpam, tuplerow);
}
pnm_freepamrow(tuplerow);
}
int
main(int argc, char * argv[]) {
struct cmdlineInfo cmdline;
struct pam inpam;
FILE * ifP;
pm_filepos rasterPos;
unsigned int goodRowCount;
pnm_init(&argc, argv);
parseCommandLine(argc, argv, &cmdline);
ifP = pm_openr_seekable(cmdline.inputFilespec);
pnm_readpaminit(ifP, &inpam, PAM_STRUCT_SIZE(tuple_type));
pm_tell2(ifP, &rasterPos, sizeof(rasterPos));
countRows(&inpam, cmdline.verbose, &goodRowCount);
pm_message("Copying %u good rows; %u bottom rows missing",
goodRowCount, inpam.height - goodRowCount);
pm_seek2(ifP, &rasterPos, sizeof(rasterPos));
copyGoodRows(&inpam, stdout, goodRowCount);
pm_close(inpam.file);
return 0;
}
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