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/*
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* Function to open floating-point depth file, making sure it's
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* the correct length, and converting from encoded 16-bit
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* depth into a temporary file if needed
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*/
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#include "rtio.h"
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#include "paths.h"
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#if defined(_WIN32) || defined(_WIN64)
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#include "platform.h"
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/* Return file descriptor for open raw float file, or -1 on error */
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/* Set expected_length to width*height, or 0 if unknown */
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/* We don't translate encoded depth under Windows because of temp file issue */
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int
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open_float_depth(const char *fname, long expected_length)
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{
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int fd = open(fname, O_RDONLY|O_BINARY);
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if (fd < 0)
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return(-1);
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if (expected_length > 0) {
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off_t flen = lseek(fd, 0, SEEK_END);
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if (flen != expected_length*sizeof(float)) {
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fprintf(stderr, "%s: expected length is %ld, actual length is %ld\n",
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fname, expected_length, (long)(flen/sizeof(float)));
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close(fd);
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return(-1);
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}
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lseek(fd, 0, SEEK_SET);
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}
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return(fd);
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}
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#else /* ! defined(_WIN32) || defined(_WIN64) */
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#include <ctype.h>
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#include "fvect.h"
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#include "depthcodec.h"
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#define FBUFLEN 1024 /* depth conversion batch size */
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/* Return file descriptor for open raw float file, or -1 on error */
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/* Set expected_length to width*height, or 0 if unknown */
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int
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open_float_depth(const char *fname, long expected_length)
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{
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char buf[FBUFLEN*sizeof(float)];
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DEPTHCODEC dc;
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ssize_t n, nleft;
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int fd = open(fname, O_RDONLY);
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if (fd < 0)
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return(-1);
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dc.finp = NULL;
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if (expected_length <= 0) { /* need to sniff file? */
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extern const char HDRSTR[];
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const int len = strlen(HDRSTR);
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n = read(fd, buf, len+1);
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if (n < len+1)
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goto gotEOF;
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if (lseek(fd, 0, SEEK_SET) != 0)
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goto seek_error;
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for (n = 0; n < len; n++)
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if (buf[n] != HDRSTR[n])
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break;
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if (n < len || !isprint(buf[len]))
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return(fd); /* unknown length raw float... */
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} else {
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off_t flen = lseek(fd, 0, SEEK_END);
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if (flen < 0 || lseek(fd, 0, SEEK_SET) != 0)
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goto seek_error;
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if (flen == expected_length*sizeof(float))
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return(fd); /* it's the right length for raw */
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}
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/* We're thinking it's an encoded depth file at this point... */
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set_dc_defaults(&dc); /* load & convert if we can */
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dc.finp = fdopen(fd, "r");
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if (!dc.finp) { /* out of memory?? */
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perror("fdopen");
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close(fd);
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return(-1);
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}
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dc.inpname = fname; /* check encoded depth header */
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dc.hdrflags = HF_HEADIN|HF_RESIN|HF_STDERR;
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if (!process_dc_header(&dc, 0, NULL) || !check_decode_depths(&dc)) {
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fclose(dc.finp); /* already reported error */
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return(-1);
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}
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if (expected_length > 0 && (long)dc.res.xr*dc.res.yr != expected_length) {
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fprintf(stderr, "%s: expected length is %ld, actual length is %ld\n",
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fname, (long)expected_length, (long)dc.res.xr*dc.res.yr);
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fclose(dc.finp);
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return(-1);
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}
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strcpy(buf, TEMPLATE); /* create temporary file to hold raw */
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fd = mkstemp(buf);
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if (fd < 0) {
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fputs(buf, stderr);
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fputs(": cannot create temporary file\n", stderr);
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fclose(dc.finp);
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return(-1);
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}
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unlink(buf); /* unlink it now (Windows forbids) */
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for (nleft = (ssize_t)dc.res.xr*dc.res.yr; nleft > 0; nleft -= FBUFLEN) {
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for (n = 0; n < FBUFLEN; n++) {
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double d = decode_depth_next(&dc);
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if (d < 0) {
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if (n < nleft)
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goto gotEOF;
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break;
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}
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((float *)buf)[n] = (float)d;
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}
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n *= sizeof(float);
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if (write(fd, buf, n) != n) {
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perror("write");
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fclose(dc.finp);
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close(fd);
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return(-1);
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}
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}
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fclose(dc.finp); /* all done -- clean up */
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if (lseek(fd, 0, SEEK_SET) != 0)
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goto seek_error;
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return(fd);
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gotEOF:
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fputs(fname, stderr);
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fputs(": unexpected end-of-file\n", stderr);
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if (dc.finp) fclose(dc.finp);
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close(fd);
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return(-1);
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seek_error:
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perror("lseek");
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close(fd);
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return(-1);
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}
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#endif |
