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#ifndef lint
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static const char RCSid[] = "$Id: idmap.c,v 2.2 2019/07/26 18:37:21 greg Exp $";
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#endif
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/*
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* Routines for loading identifier maps
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*
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*/
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#include <stdlib.h>
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#include "platform.h"
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#include "rtio.h"
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#include "idmap.h"
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/* Open ID map file for reading, copying info to stdout based on hflags */
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IDMAP *
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idmap_ropen(const char *fname, int hflags)
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{
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IDMAP idinit, *idmp = NULL;
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char infmt[MAXFMTLEN];
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int gotfmt;
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int tablength;
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int i;
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if (!fname || !*fname)
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return NULL;
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memset(&idinit, 0, sizeof(IDMAP));
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idinit.finp = fopen(fname, "rb");
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if (!idinit.finp) {
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if (hflags & HF_STDERR) {
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fputs(fname, stderr);
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fputs(": cannot open for reading\n", stderr);
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}
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return NULL;
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}
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SET_FILE_BINARY(idinit.finp);
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#ifdef getc_unlocked /* avoid stupid semaphores */
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flockfile(idinit.finp);
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#endif
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strcpy(infmt, IDMAPFMT); /* read/copy header */
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gotfmt = checkheader(idinit.finp, infmt,
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(hflags & HF_HEADOUT) ? stdout : (FILE *)NULL);
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if (gotfmt <= 0) {
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if (hflags & HF_STDERR) {
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fputs(fname, stderr);
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fputs(": bad or missing header format\n", stderr);
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}
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fclose(idinit.finp);
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return NULL;
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}
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if (hflags & HF_HEADOUT) {
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fputformat("ascii", stdout);
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fputc('\n', stdout);
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}
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switch (atoi(infmt)) { /* get index size */
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case 8:
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idinit.bytespi = 1;
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break;
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case 16:
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idinit.bytespi = 2;
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break;
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case 24:
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idinit.bytespi = 3;
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break;
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default:
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if (hflags & HF_STDERR) {
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fputs(fname, stderr);
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fputs(": unsupported index size: ", stderr);
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fputs(infmt, stderr);
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fputc('\n', stderr);
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}
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fclose(idinit.finp);
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return NULL;
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}
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/* get/copy resolution string */
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if (!fgetsresolu(&idinit.res, idinit.finp)) {
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if (hflags & HF_STDERR) {
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fputs(fname, stderr);
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fputs(": missing map resolution\n", stderr);
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}
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fclose(idinit.finp);
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return NULL;
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}
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if (hflags & HF_RESOUT)
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fputsresolu(&idinit.res, stdout);
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/* set up identifier table */
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idinit.dstart = ftell(idinit.finp);
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if (fseek(idinit.finp, 0, SEEK_END) < 0)
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goto seekerr;
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tablength = ftell(idinit.finp) - idinit.dstart -
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(long)idinit.res.xr*idinit.res.yr*idinit.bytespi;
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if (tablength < 2) {
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if (hflags & HF_STDERR) {
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fputs(fname, stderr);
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fputs(": truncated file\n", stderr);
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}
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fclose(idinit.finp);
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return NULL;
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}
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/* allocate and load table */
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idmp = (IDMAP *)malloc(sizeof(IDMAP)+tablength);
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if (idmp == NULL) {
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if (hflags & HF_STDERR)
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fputs("Out of memory allocating ID table!\n", stderr);
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fclose(idinit.finp);
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return NULL;
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}
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*idmp = idinit; /* initialize allocated struct */
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idmp->idtable[tablength] = '\0';
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if (fseek(idmp->finp, -tablength, SEEK_END) < 0)
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goto seekerr;
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if (fread(idmp->idtable, 1, tablength, idmp->finp) != tablength) {
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if (hflags & HF_STDERR) {
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fputs(fname, stderr);
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fputs(": error reading identifier table\n", stderr);
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}
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fclose(idmp->finp);
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free(idmp);
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return NULL;
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}
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if (fseek(idmp->finp, idmp->dstart, SEEK_SET) < 0)
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goto seekerr;
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while (tablength > 0) /* create index */
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idmp->nids += !idmp->idtable[--tablength];
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idmp->idoffset = (int *)malloc(sizeof(int)*idmp->nids);
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if (!idmp->idoffset) {
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if (hflags & HF_STDERR)
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fputs("Out of memory in idmap_ropen!\n", stderr);
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fclose(idmp->finp);
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free(idmp);
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return NULL;
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}
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for (i = 0; i < idmp->nids; i++) {
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idmp->idoffset[i] = tablength;
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while (idmp->idtable[tablength++])
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;
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}
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return idmp;
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seekerr:
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if (hflags & HF_STDERR) {
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fputs(fname, stderr);
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fputs(": cannot seek on file\n", stderr);
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}
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fclose(idinit.finp);
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if (idmp) free(idmp);
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return NULL;
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}
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/* Read the next ID index from input */
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int
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idmap_next_i(IDMAP *idmp)
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{
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int ndx = getint(idmp->bytespi, idmp->finp);
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if (ndx == EOF && feof(idmp->finp))
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return -1;
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ndx &= (1<<(idmp->bytespi<<3)) - 1; /* undo sign extension */
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return ndx;
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}
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/* Read the next ID from input */
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const char *
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idmap_next(IDMAP *idmp)
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{
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int ndx = idmap_next_i(idmp);
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if (ndx < 0)
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return NULL;
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return mapID(idmp, ndx);
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}
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/* Seek to a specific pixel position in ID map */
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int
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idmap_seek(IDMAP *idmp, int x, int y)
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{
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if ((x < 0) | (y < 0) | (x >= idmp->res.xr) | (y >= idmp->res.yr))
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return 0;
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if (fseek(idmp->finp, idmp->dstart + ((long)y*idmp->res.xr + x)*idmp->bytespi,
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SEEK_SET) < 0)
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return -1;
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return 1;
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}
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/* Read ID at a pixel position */
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const char *
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idmap_pix(IDMAP *idmp, int x, int y)
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{
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if (idmap_seek(idmp, x, y) <= 0)
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return NULL;
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return idmap_next(idmp);
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}
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/* Close ID map and free resources */
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void
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idmap_close(IDMAP *idmp)
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{
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fclose(idmp->finp);
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free(idmp->idoffset);
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free(idmp);
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}
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