Diff: mbed-client/nanostack-libservice/mbed-client-libservice/common_functions.h

Revision:

0:f7c60d3e7b8a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-client/nanostack-libservice/mbed-client-libservice/common_functions.h	Wed May 18 19:06:32 2016 +0000
@@ -0,0 +1,479 @@
+/*
+ * Copyright (c) 2014-2015 ARM Limited. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ * 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 COMMON_FUNCTIONS_H_
+#define COMMON_FUNCTIONS_H_
+
+#include "ns_types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * Common write 64-bit variable to 8-bit pointer.
+ *
+ * Write 64 bits in big-endian (network) byte order.
+ *
+ * \param value 64-bit variable
+ * \param ptr pointer where data to be written
+ *
+ * \return updated pointer
+ */
+NS_INLINE uint8_t *common_write_64_bit(uint64_t value, uint8_t ptr[__static 8]);
+
+/*
+ * Common read 64-bit variable from 8-bit pointer.
+ *
+ * Read 64 bits in big-endian (network) byte order.
+ *
+ * \param data_buf pointer where data to be read
+ *
+ * \return 64-bit variable
+ */
+NS_INLINE uint64_t common_read_64_bit(const uint8_t data_buf[__static 8]);
+
+/*
+ * Common write 32-bit variable to 8-bit pointer.
+ *
+ * Write 32 bits in big-endian (network) byte order.
+ *
+ * \param value 32-bit variable
+ * \param ptr pointer where data to be written
+ *
+ * \return updated pointer
+ */
+NS_INLINE uint8_t *common_write_32_bit(uint32_t value, uint8_t ptr[__static 4]);
+
+/*
+ * Common read 32-bit variable from 8-bit pointer.
+ *
+ * Read 32 bits in big-endian (network) byte order.
+ *
+ * \param data_buf pointer where data to be read
+ *
+ * \return 32-bit variable
+ */
+NS_INLINE uint32_t common_read_32_bit(const uint8_t data_buf[__static 4]);
+
+/*
+ * Common write 32-bit variable to 8-bit pointer.
+ *
+ * Write 32 bits in little-endian byte order.
+ *
+ * \param value 32-bit variable
+ * \param ptr pointer where data to be written
+ *
+ * \return updated pointer
+ */
+NS_INLINE uint8_t *common_write_32_bit_inverse(uint32_t value, uint8_t ptr[__static 4]);
+
+/*
+ * Common read 32-bit variable from 8-bit pointer.
+ *
+ * Read 32 bits in little-endian byte order.
+ *
+ * \param data_buf pointer where data to be read
+ *
+ * \return 32-bit variable
+ */
+NS_INLINE uint32_t common_read_32_bit_inverse(const uint8_t data_buf[__static 4]);
+
+/*
+ * Common write 24-bit variable to 8-bit pointer.
+ *
+ * Write 24 bits in big-endian (network) byte order.
+ *
+ * \param value 24-bit variable
+ * \param ptr pointer where data to be written
+ *
+ * \return updated pointer
+ */
+NS_INLINE uint8_t *common_write_24_bit(uint_fast24_t value, uint8_t ptr[__static 3]);
+
+/*
+ * Common read 24-bit variable from 8-bit pointer.
+ *
+ * Read 24 bits in big-endian (network) byte order.
+ *
+ * \param data_buf pointer where data to be read
+ *
+ * \return 24-bit variable
+ */
+NS_INLINE uint_fast24_t common_read_24_bit(const uint8_t data_buf[__static 3]);
+
+/*
+ * Common write 16-bit variable to 8-bit pointer.
+ *
+ * Write 16 bits in big-endian (network) byte order.
+ *
+ * \param value 16-bit variable
+ * \param ptr pointer where data to be written
+ *
+ * \return updated pointer
+ */
+NS_INLINE uint8_t *common_write_16_bit(uint16_t value, uint8_t ptr[__static 2]);
+
+/*
+ * Common read 16-bit variable from 8-bit pointer.
+ *
+ * Read 16 bits in big-endian (network) byte order.
+ *
+ * \param data_buf pointer where data to be read
+ *
+ * \return 16-bit variable
+ */
+NS_INLINE uint16_t common_read_16_bit(const uint8_t data_buf[__static 2]);
+
+/*
+ * Common write 16-bit variable to 8-bit pointer.
+ *
+ * Write 16 bits in little-endian byte order.
+ *
+ * \param value 16-bit variable
+ * \param ptr pointer where data to be written
+ *
+ * \return updated pointer
+ */
+NS_INLINE uint8_t *common_write_16_bit_inverse(uint16_t value, uint8_t ptr[__static 2]);
+
+/*
+ * Count bits in a byte
+ *
+ * \param byte byte to inspect
+ *
+ * \return number of 1-bits in byte
+ */
+NS_INLINE uint_fast8_t common_count_bits(uint8_t byte);
+
+/*
+ * Count leading zeros in a byte
+ *
+ * \param byte byte to inspect
+ *
+ * \return number of leading zeros in byte (0-8)
+ */
+NS_INLINE uint_fast8_t common_count_leading_zeros(uint8_t byte);
+
+/*
+ * Compare 8-bit serial numbers
+ *
+ * Compare two 8-bit serial numbers, according to RFC 1982 Serial Number
+ * Arithmetic.
+ *
+ * \param s1 first serial number
+ * \param s2 second serial number
+ *
+ * \return true if s1 > s2
+ * \return false if s1 <= s2, or the comparison is undefined
+ */
+NS_INLINE bool common_serial_number_greater_8(uint8_t s1, uint8_t s2);
+
+/*
+ * Compare 16-bit serial numbers
+ *
+ * Compare two 16-bit serial numbers, according to RFC 1982 Serial Number
+ * Arithmetic.
+ *
+ * \param s1 first serial number
+ * \param s2 second serial number
+ *
+ * \return true if s1 > s2
+ * \return false if s1 <= s2, or the comparison is undefined
+ */
+NS_INLINE bool common_serial_number_greater_16(uint16_t s1, uint16_t s2);
+
+/*
+ * Compare 32-bit serial numbers
+ *
+ * Compare two 32-bit serial numbers, according to RFC 1982 Serial Number
+ * Arithmetic.
+ *
+ * \param s1 first serial number
+ * \param s2 second serial number
+ *
+ * \return true if s1 > s2
+ * \return false if s1 <= s2, or the comparison is undefined
+ */
+NS_INLINE bool common_serial_number_greater_32(uint32_t s1, uint32_t s2);
+
+/*
+ * Test a bit in an bit array.
+ *
+ * Check whether a particular bit is set in a bit string. The bit array
+ * is in big-endian (network) bit order.
+ *
+ * \param bitset pointer to bit array
+ * \param bit index of bit - 0 is the most significant bit of the first byte
+ *
+ * \return true if the bit is set
+ */
+NS_INLINE bool bit_test(const uint8_t *bitset, uint_fast8_t bit);
+
+/*
+ * Set a bit in an bit array.
+ *
+ * Set a bit in a bit array. The array is in big-endian (network) bit order.
+ *
+ * \param bitset pointer to bit array
+ * \param bit index of bit - 0 is the most significant bit of the first byte
+ */
+NS_INLINE void bit_set(uint8_t *bitset, uint_fast8_t bit);
+
+/*
+ * Clear a bit in an bit array.
+ *
+ * Clear a bit in a bit array. The bit array is in big-endian (network) bit order.
+ *
+ * \param bitset pointer to bit array
+ * \param bit index of bit - 0 is the most significant bit of the first byte
+ */
+NS_INLINE void bit_clear(uint8_t *bitset, uint_fast8_t bit);
+
+/*
+ * Compare two bitstrings.
+ *
+ * Compare two bitstrings of specified length. The bit strings are in
+ * big-endian (network) bit order.
+ *
+ * \param a pointer to first string
+ * \param b pointer to second string
+ * \param bits number of bits to compare
+ *
+ * \return true if the strings compare equal
+ */
+bool bitsequal(const uint8_t *a, const uint8_t *b, uint_fast8_t bits);
+
+/*
+ * Copy a bitstring
+ *
+ * Copy a bitstring of specified length. The bit string is in big-endian
+ * (network) bit order. Bits beyond the bitlength at the destination are not
+ * modified.
+ *
+ * For example, copying 4 bits sets the first 4 bits of dst[0] from src[0],
+ * the lower 4 bits of dst[0] are unmodified.
+ *
+ * \param dst destination pointer
+ * \param src source pointer
+ * \param bits number of bits to copy
+ *
+ * \return the value of dst
+ */
+uint8_t *bitcopy(uint8_t *restrict dst, const uint8_t *restrict src, uint_fast8_t bits);
+
+/*
+ * Copy a bitstring and pad last byte with zeros
+ *
+ * Copy a bitstring of specified length. The bit string is in big-endian
+ * (network) bit order. Bits beyond the bitlength in the last destination byte are
+ * zeroed.
+ *
+ * For example, copying 4 bits sets the first 4 bits of dst[0] from src[0], and
+ * the lower 4 bits of dst[0] are set to 0.
+ *
+ * \param dst destination pointer
+ * \param src source pointer
+ * \param bits number of bits to copy
+ *
+ * \return the value of dst
+ */
+uint8_t *bitcopy0(uint8_t *restrict dst, const uint8_t *restrict src, uint_fast8_t bits);
+
+/* Provide definitions, either for inlining, or for common_functions.c */
+#if defined NS_ALLOW_INLINING || defined COMMON_FUNCTIONS_FN
+#ifndef COMMON_FUNCTIONS_FN
+#define COMMON_FUNCTIONS_FN NS_INLINE
+#endif
+
+COMMON_FUNCTIONS_FN uint8_t *common_write_64_bit(uint64_t value, uint8_t ptr[__static 8])
+{
+    *ptr++ = value >> 56;
+    *ptr++ = value >> 48;
+    *ptr++ = value >> 40;
+    *ptr++ = value >> 32;
+    *ptr++ = value >> 24;
+    *ptr++ = value >> 16;
+    *ptr++ = value >> 8;
+    *ptr++ = value;
+    return ptr;
+}
+
+COMMON_FUNCTIONS_FN uint64_t common_read_64_bit(const uint8_t data_buf[__static 8])
+{
+    uint64_t temp_64;
+    temp_64 = (uint64_t)(*data_buf++) << 56;
+    temp_64 += (uint64_t)(*data_buf++) << 48;
+    temp_64 += (uint64_t)(*data_buf++) << 40;
+    temp_64 += (uint64_t)(*data_buf++) << 32;
+    temp_64 += (uint64_t)(*data_buf++) << 24;
+    temp_64 += (uint64_t)(*data_buf++) << 16;
+    temp_64 += (uint64_t)(*data_buf++) << 8;
+    temp_64 += *data_buf++;
+    return temp_64;
+}
+
+COMMON_FUNCTIONS_FN uint8_t *common_write_32_bit(uint32_t value, uint8_t ptr[__static 4])
+{
+    *ptr++ = value >> 24;
+    *ptr++ = value >> 16;
+    *ptr++ = value >> 8;
+    *ptr++ = value;
+    return ptr;
+}
+
+COMMON_FUNCTIONS_FN uint32_t common_read_32_bit(const uint8_t data_buf[__static 4])
+{
+    uint32_t temp_32;
+    temp_32 = (uint32_t)(*data_buf++) << 24;
+    temp_32 += (uint32_t)(*data_buf++) << 16;
+    temp_32 += (uint32_t)(*data_buf++) << 8;
+    temp_32 += *data_buf++;
+    return temp_32;
+}
+
+COMMON_FUNCTIONS_FN uint8_t *common_write_32_bit_inverse(uint32_t value, uint8_t ptr[__static 4])
+{
+    *ptr++ = value;
+    *ptr++ = value >> 8;
+    *ptr++ = value >> 16;
+    *ptr++ = value >> 24;
+    return ptr;
+}
+
+COMMON_FUNCTIONS_FN uint32_t common_read_32_bit_inverse(const uint8_t data_buf[__static 4])
+{
+    uint32_t temp_32;
+    temp_32 =  *data_buf++;
+    temp_32 += (uint32_t)(*data_buf++) << 8;
+    temp_32 += (uint32_t)(*data_buf++) << 16;
+    temp_32 += (uint32_t)(*data_buf++) << 24;
+    return temp_32;
+}
+
+COMMON_FUNCTIONS_FN uint8_t *common_write_24_bit(uint_fast24_t value, uint8_t ptr[__static 3])
+{
+    *ptr++ = value >> 16;
+    *ptr++ = value >> 8;
+    *ptr++ = value;
+    return ptr;
+}
+
+COMMON_FUNCTIONS_FN uint_fast24_t common_read_24_bit(const uint8_t data_buf[__static 3])
+{
+    uint_fast24_t temp_24;
+    temp_24 = (uint_fast24_t)(*data_buf++) << 16;
+    temp_24 += (uint_fast24_t)(*data_buf++) << 8;
+    temp_24 += *data_buf++;
+    return temp_24;
+}
+
+COMMON_FUNCTIONS_FN uint8_t *common_write_16_bit(uint16_t value, uint8_t ptr[__static 2])
+{
+    *ptr++ = value >> 8;
+    *ptr++ = value;
+    return ptr;
+}
+
+COMMON_FUNCTIONS_FN uint16_t common_read_16_bit(const uint8_t data_buf[__static 2])
+{
+    uint16_t temp_16;
+    temp_16 = (uint16_t)(*data_buf++) << 8;
+    temp_16 += *data_buf++;
+    return temp_16;
+}
+
+COMMON_FUNCTIONS_FN uint8_t *common_write_16_bit_inverse(uint16_t value, uint8_t ptr[__static 2])
+{
+    *ptr++ = value;
+    *ptr++ = value >> 8;
+    return ptr;
+}
+
+COMMON_FUNCTIONS_FN uint_fast8_t common_count_bits(uint8_t byte)
+{
+    /* First step sets each bit pair to be count of bits (00,01,10) */
+    /* [00-00 = 00, 01-00 = 01, 10-01 = 01, 11-01 = 10] */
+    uint_fast8_t count = byte - ((byte >> 1) & 0x55);
+    /* Add bit pairs to make each nibble contain count of bits (0-4) */
+    count = (count & 0x33) + ((count >> 2) & 0x33);
+    /* Final result is sum of nibbles (0-8) */
+    count = (count >> 4) + (count & 0x0F);
+    return count;
+}
+
+COMMON_FUNCTIONS_FN uint_fast8_t common_count_leading_zeros(uint8_t byte)
+{
+#ifdef  __CC_ARM
+    return byte ? __clz((unsigned int) byte << 24) : 8;
+#elif defined __GNUC__
+    return byte ? __builtin_clz((unsigned int) byte << 24) : 8;
+#else
+    uint_fast8_t cnt = 0;
+    if (byte == 0) {
+        return 8;
+    }
+    if ((byte & 0xF0) == 0) {
+        byte <<= 4;
+        cnt += 4;
+    }
+    if ((byte & 0xC0) == 0) {
+        byte <<= 2;
+        cnt += 2;
+    }
+    if ((byte & 0x80) == 0) {
+        cnt += 1;
+    }
+
+    return cnt;
+#endif
+}
+
+COMMON_FUNCTIONS_FN bool common_serial_number_greater_8(uint8_t s1, uint8_t s2)
+{
+    return (s1 > s2 && s1 - s2 < UINT8_C(0x80)) || (s1 < s2 && s2 - s1 > UINT8_C(0x80));
+}
+
+COMMON_FUNCTIONS_FN bool common_serial_number_greater_16(uint16_t s1, uint16_t s2)
+{
+    return (s1 > s2 && s1 - s2 < UINT16_C(0x8000)) || (s1 < s2 && s2 - s1 > UINT16_C(0x8000));
+}
+
+COMMON_FUNCTIONS_FN bool common_serial_number_greater_32(uint32_t s1, uint32_t s2)
+{
+    return (s1 > s2 && s1 - s2 < UINT32_C(0x80000000)) || (s1 < s2 && s2 - s1 > UINT32_C(0x80000000));
+}
+
+COMMON_FUNCTIONS_FN bool bit_test(const uint8_t *bitset, uint_fast8_t bit)
+{
+    return bitset[bit >> 3] & (0x80 >> (bit & 7));
+}
+
+COMMON_FUNCTIONS_FN void bit_set(uint8_t *bitset, uint_fast8_t bit)
+{
+    bitset[bit >> 3] |= (0x80 >> (bit & 7));
+}
+
+COMMON_FUNCTIONS_FN void bit_clear(uint8_t *bitset, uint_fast8_t bit)
+{
+    bitset[bit >> 3] &= ~(0x80 >> (bit & 7));
+}
+
+#endif /* defined NS_ALLOW_INLINING || defined COMMON_FUNCTIONS_FN */
+
+#ifdef __cplusplus
+}
+#endif
+#endif /*__COMMON_FUNCTIONS_H_*/