73 lines
2.5 KiB
C
73 lines
2.5 KiB
C
/****************************************************************************
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** gmio
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** Copyright Fougue (2 Mar. 2015)
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** contact@fougue.pro
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**
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** This software is a reusable library whose purpose is to provide complete
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** I/O support for various CAD file formats (eg. STL)
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**
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** This software is governed by the CeCILL-B license under French law and
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** abiding by the rules of distribution of free software. You can use,
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** modify and/ or redistribute the software under the terms of the CeCILL-B
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** license as circulated by CEA, CNRS and INRIA at the following URL
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** "http://www.cecill.info/licences/Licence_CeCILL-B_V1-en.html".
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****************************************************************************/
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#include "stlb_infos_get.h"
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#include "../../gmio_core/error.h"
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#include "../../gmio_core/internal/byte_swap.h"
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#include <string.h>
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static enum gmio_endianness gmio_stl_format_to_endianness(
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enum gmio_stl_format format)
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{
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if (format == GMIO_STL_FORMAT_BINARY_BE)
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return GMIO_ENDIANNESS_BIG;
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else if (format == GMIO_STL_FORMAT_BINARY_LE)
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return GMIO_ENDIANNESS_LITTLE;
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return GMIO_ENDIANNESS_UNKNOWN;
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}
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int gmio_stlb_infos_get(
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struct gmio_stl_infos* infos,
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struct gmio_stream* stream,
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unsigned flags,
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const struct gmio_stl_infos_get_options* opts)
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{
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if (flags != 0) {
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const enum gmio_endianness byte_order =
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gmio_stl_format_to_endianness(opts->format_hint);
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uint32_t facet_count = 0;
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uint8_t buff[GMIO_STLB_HEADER_SIZE + sizeof(uint32_t)];
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{ /* Read header and facet count into buff */
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const size_t read_size =
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gmio_stream_read_bytes(stream, buff, sizeof(buff));
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if (read_size != sizeof(buff))
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return GMIO_ERROR_STREAM;
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}
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memcpy(&facet_count, buff + GMIO_STLB_HEADER_SIZE, sizeof(uint32_t));
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if (byte_order != GMIO_ENDIANNESS_HOST)
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facet_count = gmio_uint32_bswap(facet_count);
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if (flags & GMIO_STLB_INFO_FLAG_HEADER)
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memcpy(infos->stlb_header.data, buff, GMIO_STLB_HEADER_SIZE);
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if (flags & GMIO_STL_INFO_FLAG_FACET_COUNT)
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infos->facet_count = facet_count;
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if (flags & GMIO_STL_INFO_FLAG_SIZE)
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infos->size = gmio_stlb_infos_size(facet_count);
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}
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return GMIO_ERROR_OK;
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}
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gmio_streamsize_t gmio_stlb_infos_size(uint32_t facet_count)
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{
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return GMIO_STLB_HEADER_SIZE
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+ sizeof(uint32_t)
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+ facet_count * GMIO_STLB_TRIANGLE_RAWSIZE;
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}
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