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#ifndef lint |
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static const char RCSid[] = "$Id: idmap.c,v 2.2 2019/07/23 17:20:20 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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|
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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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|
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|
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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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|
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if (!fname || !*fname) |
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return NULL; |
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|
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memset(&idinit, 0, sizeof(IDMAP)); |
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|
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idinit.finp = fopen(fname, "rb"); |
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|
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if (!idinit.finp) { |
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fputs(fname, stderr); |
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fputs(": cannot open for reading\n", stderr); |
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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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fputs(fname, stderr); |
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fputs(": bad or missing header format\n", stderr); |
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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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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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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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fputs(fname, stderr); |
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fputs(": missing map resolution\n", stderr); |
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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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fputs(fname, stderr); |
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fputs(": truncated file\n", stderr); |
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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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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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fputs(fname, stderr); |
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fputs(": error reading identifier table\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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if (fseek(idmp->finp, idmp->curpos = 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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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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fputs(fname, stderr); |
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fputs(": cannot seek on file\n", stderr); |
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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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|
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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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|
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if (ndx == EOF && feof(idmp->finp)) |
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return -1; |
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|
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idmp->curpos += idmp->bytespi; |
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|
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ndx &= (1<<(idmp->bytespi<<3)) - 1; /* undo sign extension */ |
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|
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return ndx; |
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} |
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|
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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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|
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if (ndx < 0) |
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return NULL; |
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|
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return mapID(idmp, ndx); |
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} |
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|
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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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long seekto; |
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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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|
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seekto = idmp->dstart + ((long)y*idmp->res.xr + x)*idmp->bytespi; |
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|
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if (seekto != idmp->curpos && fseek(idmp->finp, seekto, SEEK_SET) < 0) |
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return -1; |
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|
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idmp->curpos = seekto; |
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|
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return 1; |
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} |
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|
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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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|
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return idmap_next(idmp); |
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} |
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|
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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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} |
