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Merge "cutils: add OS-independent endian.h"

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Greg Hackmann 2015-04-16 20:06:39 +00:00 committed by Gerrit Code Review
commit 88e03449de
3 changed files with 113 additions and 0 deletions
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52
include/cutils/endian.h Normal file
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@ -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 */

1
libcutils/tests/Android.mk
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@ -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 \

60
libcutils/tests/EndianTest.cpp Normal file
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/*
* 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)));
}