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126 lines
3.9 KiB
C
126 lines
3.9 KiB
C
#ifndef FLATCC_ENDIAN_H
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#define FLATCC_ENDIAN_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* This file provides helper macros to define type-specific macros and
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* inline functions that convert between stored data and native data
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* indedpently of both native (host) endianness and protocol endianness
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* (i.e. the serialized endian format).
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*
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* To detect endianness correctly ensure one of the following is defined.
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*
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* __LITTLE_ENDIAN__
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* __BIG_ENDIAN__
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* FLATBUFFERS_LITTLEENDIAN=1
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* FLATBUFFERS_LITTLEENDIAN=0
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*
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* Note: the Clang compiler likely already does this, but other
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* compilers may have their own way, if at all.
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*
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* It is also necessary to include <endian.h> or a compatible
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* implementation in order to provide:
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*
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* le16toh, le32to, le64toh, be16toh, be32toh, be64toh,
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* htole16, htole32, htole64, htobe16, htobe32, htobe64.
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*
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* A simple way to ensure all of the above for most platforms is
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* to include the portable endian support file:
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*
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* #include "flatcc/portable/pendian.h"
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*
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* It is also necessary to include
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*
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* #include "flatcc/flatcc_types.h"
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*
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* or an equivalent file. This makes it possible to change the
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* endianness of the serialized data and the sizes of flatbuffer
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* specific types such as `uoffset_t`.
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*
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* Note: the mentioned include files are likely already included
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* by the file including this file, at least for the default
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* configuration.
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*/
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#ifndef UINT8_t
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#include <stdint.h>
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#endif
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/* These are needed to simplify accessor macros and are not found in <endian.h>. */
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#ifndef le8toh
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#define le8toh(n) (n)
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#endif
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#ifndef be8toh
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#define be8toh(n) (n)
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#endif
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#ifndef htole8
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#define htole8(n) (n)
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#endif
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#ifndef htobe8
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#define htobe8(n) (n)
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#endif
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#include "flatcc_accessors.h"
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/* This is the binary encoding endianness, usually LE for flatbuffers. */
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#if FLATBUFFERS_PROTOCOL_IS_LE
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#define flatbuffers_endian le
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#elif FLATBUFFERS_PROTOCOL_IS_BE
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#define flatbuffers_endian be
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#else
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#error "flatbuffers has no defined endiannesss"
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#endif
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__flatcc_define_basic_scalar_accessors(flatbuffers_, flatbuffers_endian)
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__flatcc_define_integer_accessors(flatbuffers_bool, flatbuffers_bool_t,
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FLATBUFFERS_BOOL_WIDTH, flatbuffers_endian)
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__flatcc_define_integer_accessors(flatbuffers_union_type, flatbuffers_union_type_t,
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FLATBUFFERS_UTYPE_WIDTH, flatbuffers_endian)
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__flatcc_define_integer_accessors(__flatbuffers_uoffset, flatbuffers_uoffset_t,
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FLATBUFFERS_UOFFSET_WIDTH, flatbuffers_endian)
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__flatcc_define_integer_accessors(__flatbuffers_soffset, flatbuffers_soffset_t,
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FLATBUFFERS_SOFFSET_WIDTH, flatbuffers_endian)
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__flatcc_define_integer_accessors(__flatbuffers_voffset, flatbuffers_voffset_t,
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FLATBUFFERS_VOFFSET_WIDTH, flatbuffers_endian)
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__flatcc_define_integer_accessors(__flatbuffers_utype, flatbuffers_utype_t,
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FLATBUFFERS_UTYPE_WIDTH, flatbuffers_endian)
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__flatcc_define_integer_accessors(__flatbuffers_thash, flatbuffers_thash_t,
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FLATBUFFERS_THASH_WIDTH, flatbuffers_endian)
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/* flatcc/portable/pendian.h sets LITTLE/BIG flags if possible, and always defines le16toh. */
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#ifndef flatbuffers_is_native_pe
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#if defined(__LITTLE_ENDIAN__) || FLATBUFFERS_LITTLEENDIAN
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#undef FLATBUFFERS_LITTLEENDIAN
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#define FLATBUFFERS_LITTLEENDIAN 1
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#define flatbuffers_is_native_pe() (FLATBUFFERS_PROTOCOL_IS_LE)
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#elif defined(__BIG_ENDIAN__) || (defined(FLATBUFFERS_LITTLEENDIAN) && !FLATBUFFERS_LITTLEENDIAN)
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#undef FLATBUFFERS_LITTLEENDIAN
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#define FLATBUFFERS_LITTLEENDIAN 0
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#define flatbuffers_is_native_pe() (FLATBUFFERS_PROTOCOL_IS_BE)
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#else
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#define flatbuffers_is_native_pe() (__FLATBUFFERS_CONCAT(flatbuffers_endian, 16toh)(1) == 1)
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#endif
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#endif
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#ifndef flatbuffers_is_native_le
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#define flatbuffers_is_native_le() flatbuffers_is_native_pe()
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#endif
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#ifndef flatbuffers_is_native_be
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#define flatbuffers_is_native_be() (!flatbuffers_is_native_pe())
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* FLATCC_ENDIAN_H */
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