From 3a310e181e95e65609d64f7474b26446d4a1bc76 Mon Sep 17 00:00:00 2001
From: josh <josh@bd8a9e45-a331-0410-811e-c64571078777>
Date: Sat, 2 Jun 2007 22:05:47 +0000
Subject: [PATCH] initial import

git-svn-id: svn://anubis/misc/stl@4 bd8a9e45-a331-0410-811e-c64571078777
---
 stl.c | 28 ++++++++++++++++++++++++++++
 stl.h | 44 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 72 insertions(+)
 create mode 100644 stl.c
 create mode 100644 stl.h

diff --git a/stl.c b/stl.c
new file mode 100644
index 0000000..d9bcb37
--- /dev/null
+++ b/stl.c
@@ -0,0 +1,28 @@
+
+#include <sys/stat.h>
+#include <stdio.h>
+#include "stl.h"
+
+/* load a STL file and return a pointer to the stl_t struct */
+stl_t *	stl_load(const char * filename)
+{
+	struct stat s;
+	if (stat(filename, &s))
+		return NULL;
+	int size = s.st_size;
+	if (size < sizeof(stl_t))
+		return NULL;
+	FILE *fil;
+	if ((fil = fopen(filename, "rb")) == NULL)
+		return NULL;
+	stl_t * stl = (stl_t *) malloc(s.st_size);
+	fread(stl, 1, s.st_size, fil);
+	fclose(fil);
+	if (s.st_size <
+		sizeof(stl_t) + sizeof(stl_face_t) * (stl_num_faces(stl)-1))
+	{
+		free(stl);
+		return NULL;
+	}
+	return stl;
+}
diff --git a/stl.h b/stl.h
new file mode 100644
index 0000000..5ca140b
--- /dev/null
+++ b/stl.h
@@ -0,0 +1,44 @@
+/*
+ * stl.h
+ * Author: Josh Holtrop
+ * Date: 2007-06-02
+ * From information at http://en.wikipedia.org/wiki/STL_(file_format)
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* macros */
+#define STL_HEADER_LENGTH 80
+#define stl_num_faces(stlp) ((stlp)->n_faces)
+#define stl_face(stlp,facenum) ((stlp)->faces[(facenum)])
+#define stl_attr_color_valid(attr) ((attr) & 0x8000)
+#define stl_attr_color_r(attr) (((attr) & 0x7C00) >> 7)
+#define stl_attr_color_g(attr) (((attr) & 0x03E0) >> 2)
+#define stl_attr_color_b(attr) (((attr) & 0x001F) << 3)
+
+
+/* types */
+typedef struct stl_face_s
+{
+	float		normal[3];
+	float		vertices[3][3];
+	unsigned short	attribute;
+} stl_face_t;
+
+typedef struct stl_s
+{
+	char		header[STL_HEADER_LENGTH];
+	unsigned int	n_faces;
+	stl_face_t	faces[1];
+} stl_t;
+
+
+/* functions */
+stl_t *	stl_load(const char * filename);
+
+
+#ifdef __cplusplus
+}
+#endif