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Commit c3bac8b6 authored by Greg Hackmann's avatar Greg Hackmann
Browse files

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: default avatarGreg Hackmann <ghackmann@google.com>
parent 96647a68

include/cutils/endian.h

0 → 100644
+52 −0
Original line number Diff line number Diff line 
/*

 * 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 */

libcutils/tests/Android.mk

+1 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ LOCAL_PATH := $(call my-dir) 


test_src_files := \

    test_str_parms.cpp \

    EndianTest.cpp



test_target_only_src_files := \

    MemsetTest.cpp \

libcutils/tests/EndianTest.cpp

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+60 −0
Original line number Diff line number Diff line 
/*

 * 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.

 */



#include <stdint.h>



#define TEST_CUTILS_ENDIAN_H

#include <cutils/endian.h>

#include <gtest/gtest.h>



static const uint16_t host16 = 0x1122;

static const uint32_t host32 = 0x11223344;

static const uint64_t host64 = 0x1122334455667788;

static const uint16_t swapped16 = 0x2211;

static const uint32_t swapped32 = 0x44332211;

static const uint64_t swapped64 = 0x8877665544332211;

#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__

static const uint16_t le16 = swapped16;

static const uint32_t le32 = swapped32;

static const uint64_t le64 = swapped64;

static const uint16_t be16 = native16;

static const uint32_t be32 = native32;

static const uint64_t be64 = native64;

#else

static const uint16_t le16 = host16;

static const uint32_t le32 = host32;

static const uint64_t le64 = host64;

static const uint16_t be16 = swapped16;

static const uint32_t be32 = swapped32;

static const uint64_t be64 = swapped64;

#endif



TEST(endian, endian) {

    EXPECT_EQ(le16, htole16(host16));

    EXPECT_EQ(host16, le16toh(htole16(host16)));

    EXPECT_EQ(be16, htobe16(host16));

    EXPECT_EQ(host16, be16toh(htobe16(host16)));



    EXPECT_EQ(le32, htole32(host32));

    EXPECT_EQ(host32, le32toh(htole32(host32)));

    EXPECT_EQ(be32, htobe32(host32));

    EXPECT_EQ(host32, be32toh(htobe32(host32)));



    EXPECT_EQ(le64, htole64(host64));

    EXPECT_EQ(host64, le64toh(htole64(host64)));

    EXPECT_EQ(be64, htobe64(host64));

    EXPECT_EQ(host64, be64toh(htobe64(host64)));

}