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admesh: Fixed a problem in loading an STL when compiled with

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Visual Studio 2013. Added multiple compile time checks for data
sizes and alignment. The library STL import is not big endian safe, so
added a test for endianity, modified STL export to a faster little endian only.
This commit is contained in:
bubnikv
2016-11-17 16:57:58 +01:00
parent 9772584d78
commit 2085a482c7
3 changed files with 24 additions and 72 deletions
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17
xs/src/admesh/stl.h
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@@ -25,6 +25,12 @@
#include <stdio.h>
#include <stdint.h>
#include <stddef.h>
#include <boost/predef/detail/endian_compat.h>
#ifndef BOOST_LITTLE_ENDIAN
#error "admesh works correctly on little endian machines only!"
#endif
#ifdef __cplusplus
extern "C" {
@@ -51,12 +57,16 @@ typedef struct {
float z;
} stl_vertex;
static_assert(sizeof(stl_vertex) == 12, "size of stl_vertex incorrect");
typedef struct {
float x;
float y;
float z;
} stl_normal;
static_assert(sizeof(stl_normal) == 12, "size of stl_normal incorrect");
typedef char stl_extra[2];
typedef struct {
@@ -66,6 +76,11 @@ typedef struct {
} stl_facet;
#define SIZEOF_STL_FACET 50
static_assert(offsetof(stl_facet, normal) == 0, "stl_facet.normal has correct offset");
static_assert(offsetof(stl_facet, vertex) == 12, "stl_facet.vertex has correct offset");
static_assert(offsetof(stl_facet, extra ) == 48, "stl_facet.extra has correct offset");
static_assert(sizeof(stl_facet) >= SIZEOF_STL_FACET, "size of stl_facet incorrect");
typedef enum {binary, ascii, inmemory} stl_type;
typedef struct {
@@ -85,6 +100,8 @@ typedef struct stl_hash_edge {
struct stl_hash_edge *next;
} stl_hash_edge;
static_assert(offsetof(stl_hash_edge, facet_number) == SIZEOF_EDGE_SORT, "size of stl_hash_edge.key incorrect");
typedef struct {
// Index of a neighbor facet.
int neighbor[3];