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| author | Greg Hackmann <ghackmann@google.com> | 2015-04-15 16:33:30 -0700 |
|---|---|---|
| committer | Greg Hackmann <ghackmann@google.com> | 2015-04-16 11:12:02 -0700 |
| commit | c3bac8b6719332f31140b2a034b70cf7f9eb3e51 (patch) | |
| tree | bdc8dde7363c63c28146a8a8f38bc7ccbf1bbcce /include/cutils | |
| parent | 96647a688011da6f1bd94a6e5d12202aa5675446 (diff) | |
| download | system_core-c3bac8b6719332f31140b2a034b70cf7f9eb3e51.zip system_core-c3bac8b6719332f31140b2a034b70cf7f9eb3e51.tar.gz system_core-c3bac8b6719332f31140b2a034b70cf7f9eb3e51.tar.bz2 | |
cutils: add OS-independent endian.h
cutils/endian.h provides the helpers defined in endian(3), either by
pulling in the OS's built-in endian.h (where available) or recreating
them using GCC builtins.
Change-Id: Ic8965f67e1efdc03f884dbe6b7fe0276f840e4fc
Signed-off-by: Greg Hackmann <ghackmann@google.com>
Diffstat (limited to 'include/cutils')
| -rw-r--r-- | include/cutils/endian.h | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/include/cutils/endian.h b/include/cutils/endian.h new file mode 100644 index 0000000..3d27ce6 --- /dev/null +++ b/include/cutils/endian.h @@ -0,0 +1,52 @@ +/* + * Copyright (C) 2015 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef __CUTILS_ENDIAN_H +#define __CUTILS_ENDIAN_H + +#if defined(__linux__) && !defined(TEST_CUTILS_ENDIAN_H) +#include <endian.h> +#else + +#if !defined(__BYTE_ORDER__) +/* gcc and clang predefine __BYTE_ORDER__, so this should never happen */ +#error Compiler does not define __BYTE_ORDER__ +#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ +#define htobe16(x) (x) +#define htobe32(x) (x) +#define htobe64(x) (x) +#define htole16(x) __builtin_bswap16(x) +#define htole32(x) __builtin_bswap32(x) +#define htole64(x) __builtin_bswap64(x) +#else +#define htobe16(x) __builtin_bswap16(x) +#define htobe32(x) __builtin_bswap32(x) +#define htobe64(x) __builtin_bswap64(x) +#define htole16(x) (x) +#define htole32(x) (x) +#define htole64(x) (x) +#endif /* __BYTE_ORDER__ */ + +#define be16toh(x) htobe16(x) +#define le16toh(x) htole16(x) +#define be32toh(x) htobe32(x) +#define le32toh(x) htole32(x) +#define be64toh(x) htobe64(x) +#define le64toh(x) htole64(x) + +#endif /* defined(__linux__) */ + +#endif /* __CUTILS_ENDIAN_H */ |