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stlb: introduce 'byte_order' parameter (for now only little-endian is supported)

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This commit is contained in:
Hugues Delorme 2013-04-27 00:16:38 +02:00
parent e983afe159
commit 4924de91cb
4 changed files with 22 additions and 6 deletions
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6
src/c/libstl/stlb_read.c
View File

@ -25,7 +25,9 @@ static void foug_stlb_read_facets(foug_stlb_geom_input_t* geom,
}
}
int foug_stlb_read(foug_stlb_geom_input_t* geom, foug_transfer_t* trsf)
int foug_stlb_read(foug_stlb_geom_input_t* geom,
foug_transfer_t* trsf,
foug_endianness_t byte_order)
{
uint32_t total_facet_count;
size_t accum_facet_count_read;
@ -35,6 +37,8 @@ int foug_stlb_read(foug_stlb_geom_input_t* geom, foug_transfer_t* trsf)
return FOUG_DATAX_NULL_BUFFER_ERROR;
if (trsf->buffer_size < FOUG_STLB_MIN_CONTENTS_SIZE)
return FOUG_DATAX_INVALID_BUFFER_SIZE_ERROR;
if (byte_order != FOUG_LITTLE_ENDIAN)
return FOUG_STLB_READ_UNSUPPORTED_BYTE_ORDER;
/* Read header */
{

5
src/c/libstl/stlb_read.h
View File

@ -3,6 +3,7 @@
#include "stl_global.h"
#include "stlb_triangle.h"
#include "../endian.h"
#include "../transfer.h"
/* foug_stlb_geom_input */
@ -18,10 +19,12 @@ struct foug_stlb_geom_input
/* foug_stlb_read() */
FOUG_DATAX_LIBSTL_EXPORT int foug_stlb_read(foug_stlb_geom_input_t* geom,
foug_transfer_t* trsf);
foug_transfer_t* trsf,
foug_endianness_t byte_order);
/* Specific error codes returned by foug_stlb_read() */
#define FOUG_STLB_READ_HEADER_WRONG_SIZE_ERROR 1
#define FOUG_STLB_READ_FACET_COUNT_ERROR 2
#define FOUG_STLB_READ_UNSUPPORTED_BYTE_ORDER 3
#endif /* FOUG_DATAX_C_LIBSTL_STLB_READ_H */

10
src/c/libstl/stlb_write.c
View File

@ -25,7 +25,8 @@ static void foug_stlb_write_facets(const foug_stlb_geom_output_t* geom,
} /* end for */
}
int foug_stlb_write(const foug_stlb_geom_output_t* geom, foug_transfer_t* trsf)
int foug_stlb_write(const foug_stlb_geom_output_t* geom,
foug_transfer_t* trsf, foug_endianness_t byte_order)
{
uint32_t facet_count;
uint32_t i_facet;
@ -41,6 +42,8 @@ int foug_stlb_write(const foug_stlb_geom_output_t* geom, foug_transfer_t* trsf)
return FOUG_STLB_WRITE_NULL_GET_TRIANGLE_COUNT_FUNC;
if (geom == NULL || geom->get_triangle_func == NULL)
return FOUG_STLB_WRITE_NULL_GET_TRIANGLE_FUNC;
if (byte_order != FOUG_LITTLE_ENDIAN/* && byte_order != FOUG_BIG_ENDIAN*/)
return FOUG_STLB_WRITE_UNSUPPORTED_BYTE_ORDER;
/* Write header */
{
@ -56,7 +59,10 @@ int foug_stlb_write(const foug_stlb_geom_output_t* geom, foug_transfer_t* trsf)
/* Write facet count */
facet_count = geom->get_triangle_count_func(geom);
foug_encode_uint32_le(facet_count, trsf->buffer);
if (byte_order == FOUG_LITTLE_ENDIAN)
foug_encode_uint32_le(facet_count, trsf->buffer);
else
foug_encode_uint32_be(facet_count, trsf->buffer);
if (foug_stream_write(&trsf->stream, trsf->buffer, sizeof(uint32_t), 1) != 1)
return FOUG_DATAX_STREAM_ERROR;

7
src/c/libstl/stlb_write.h
View File

@ -3,6 +3,7 @@
#include "stl_global.h"
#include "stlb_triangle.h"
#include "../endian.h"
#include "../transfer.h"
/* foug_stlb_geom_output */
@ -10,17 +11,19 @@ typedef struct foug_stlb_geom_output foug_stlb_geom_output_t;
struct foug_stlb_geom_output
{
void* cookie;
void (*get_header_func) (const foug_stlb_geom_output_t*, uint8_t*);
void (*get_header_func) (const foug_stlb_geom_output_t*, uint8_t*); /* Optional */
uint32_t (*get_triangle_count_func)(const foug_stlb_geom_output_t*);
void (*get_triangle_func) (const foug_stlb_geom_output_t*, uint32_t, foug_stlb_triangle_t*);
};
/* foug_stlb_write() */
FOUG_DATAX_LIBSTL_EXPORT int foug_stlb_write(const foug_stlb_geom_output_t* geom,
foug_transfer_t* trsf);
foug_transfer_t* trsf,
foug_endianness_t byte_order);
/* Specific error codes returned by foug_stlb_write() */
#define FOUG_STLB_WRITE_NULL_GET_TRIANGLE_COUNT_FUNC 1
#define FOUG_STLB_WRITE_NULL_GET_TRIANGLE_FUNC 2
#define FOUG_STLB_WRITE_UNSUPPORTED_BYTE_ORDER 3
#endif /* FOUG_DATAX_C_LIBSTL_STLB_WRITE_H */