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Big endian fix, thanks to @hyperair for hints and initial implementation.

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This commit is contained in:
bubnikv 2017-10-03 10:57:16 +02:00
parent 84d4bf8fdb
commit a52a04550e
3 changed files with 44 additions and 10 deletions
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29
xs/src/admesh/stl_io.cpp
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@ -23,9 +23,9 @@
#include <stdlib.h>
#include <string.h>
#include "stl.h"
//#include "config.h"
#include <boost/nowide/cstdio.hpp>
#include <boost/detail/endian.hpp>
#if !defined(SEEK_SET)
#define SEEK_SET 0
@ -204,6 +204,17 @@ stl_print_neighbors(stl_file *stl, char *file) {
fclose(fp);
}
#ifndef BOOST_LITTLE_ENDIAN
// Swap a buffer of 32bit data from little endian to big endian and vice versa.
void stl_internal_reverse_quads(char *buf, size_t cnt)
{
for (size_t i = 0; i < cnt; i += 4) {
std::swap(buf[i], buf[i+3]);
std::swap(buf[i+1], buf[i+2]);
}
}
#endif
void
stl_write_binary(stl_file *stl, const char *file, const char *label) {
FILE *fp;
@ -229,9 +240,23 @@ stl_write_binary(stl_file *stl, const char *file, const char *label) {
for(i = strlen(label); i < LABEL_SIZE; i++) putc(0, fp);
fseek(fp, LABEL_SIZE, SEEK_SET);
#ifdef BOOST_LITTLE_ENDIAN
fwrite(&stl->stats.number_of_facets, 4, 1, fp);
for(i = 0; i < stl->stats.number_of_facets; i++)
for (i = 0; i < stl->stats.number_of_facets; ++ i)
fwrite(stl->facet_start + i, SIZEOF_STL_FACET, 1, fp);
#else /* BOOST_LITTLE_ENDIAN */
char buffer[50];
// Convert the number of facets to little endian.
memcpy(buffer, &stl->stats.number_of_facets, 4);
stl_internal_reverse_quads(buffer, 4);
fwrite(buffer, 4, 1, fp);
for (i = 0; i < stl->stats.number_of_facets; ++ i) {
memcpy(buffer, stl->facet_start + i, 50);
// Convert to little endian.
stl_internal_reverse_quads(buffer, 48);
fwrite(buffer, SIZEOF_STL_FACET, 1, fp);
}
#endif /* BOOST_LITTLE_ENDIAN */
fclose(fp);
}