Original project changes: Bit/Byte Utils - Fixes and improvements
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337b736771
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@ -373,44 +373,88 @@ INT sign_extend( UINT uvalue)
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*/
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template<uint8_t BIT>
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bool get_bit(uint8_t data)
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{
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{
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return (0 != (data & (1 << BIT)));
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}
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}
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/**
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* get_bit: Get at a specific (run-time defined) bit in a byte.
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*/
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inline bool get_bit(uint8_t data, uint8_t bit)
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{
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return (0 != (data & (1 << bit)));
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}
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/**
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* get_uint_bits: Get at unsigned integer values within data.
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* Compile-time defined section.
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*/
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template<uint8_t BIT, uint8_t BITLEN>
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uint16_t get_uint_bits(uint32_t data)
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{
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return (data >> BIT) & ((0x1U <<(BITLEN+1))-1);
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}
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/**
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* get_uint_bits: Get at unsigned integer values within data.
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* Run-time defined section.
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*/
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inline uint16_t get_uint_bits(uint32_t data, uint8_t bit, uint8_t bitlen)
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{
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return (data >> bit) & ((0x1U <<(bitlen+1))-1);
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}
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/**
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* get_uint_bits: Get at signed integer values within data.
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* Compile-time defined section.
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*/
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template<uint8_t BIT, uint8_t BITLEN>
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int16_t get_int_bits(uint32_t data)
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{
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uint16_t unsigned_val = get_uint_bits<BIT,BITLEN>(data);
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return sign_extend<uint16_t,int16_t, BITLEN-1>(unsigned_val);
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}
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/**
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* get_uint_bits: Get at signed integer values within data.
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* Run-time defined section.
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*/
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inline int16_t get_int_bits(uint32_t data, uint8_t bit, uint8_t bitlen)
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{
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uint16_t unsigned_val = get_uint_bits(data, bit, bitlen);
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return sign_extend<uint16_t,int16_t>(unsigned_val, bitlen-1);
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}
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// helper to provide a big endian integer from a given number of bytes.
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// The helper function checks the length before using this.
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template<uint8_t BYTES>
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template<uint8_t BYTES, typename UINT = uint32_t>
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struct ovms_bytes_impl_t
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{
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static uint32_t get_bytes_int(const uint8_t *data, uint32_t index)
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static UINT get_bytes_uint(const uint8_t *data, uint32_t index)
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{
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return (data[index + (BYTES - 1)])
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| (ovms_bytes_impl_t < BYTES - 1 >::get_bytes_int(data, index) << 8);
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| (ovms_bytes_impl_t < BYTES - 1, UINT>::get_bytes_uint(data, index) << 8);
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}
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};
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template<>
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struct ovms_bytes_impl_t<1>
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template<typename UINT>
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struct ovms_bytes_impl_t<1,UINT>
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{
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static uint32_t get_bytes_int(const uint8_t *data, uint32_t index)
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static UINT get_bytes_uint(const uint8_t *data, uint32_t index)
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{
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return (data[index]);
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}
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};
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// Helper Class to access Little-Endian values.
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template<uint8_t BYTES>
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template<uint8_t BYTES, typename UINT = uint32_t>
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struct get_bytes_le_impl_t
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{
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static uint32_t get_bytes_int( const uint8_t *data, uint32_t index)
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static UINT get_bytes_uint( const uint8_t *data, uint32_t index)
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{
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return ((data[index + (BYTES - 1)]) << (8 * (BYTES - 1)))
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| get_bytes_le_impl_t < BYTES - 1 >::get_bytes_int(data, index);
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return ((data[index + (BYTES - 1)]) << (UINT(8) * (BYTES - 1)))
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| get_bytes_le_impl_t < BYTES - 1 >::get_bytes_uint(data, index);
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}
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};
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template<>
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struct get_bytes_le_impl_t<1>
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template<typename UINT>
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struct get_bytes_le_impl_t<1, UINT>
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{
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static uint32_t get_bytes_int(const uint8_t *data, uint32_t index)
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static UINT get_bytes_uint(const uint8_t *data, uint32_t index)
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{
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return (data[index]);
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}
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@ -421,13 +465,13 @@ struct get_bytes_le_impl_t<1>
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*
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* @return true If within bounds
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*/
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template<uint8_t BYTES>
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bool get_uint_bytes_be(const uint8_t *data, uint32_t index, uint32_t length, uint32_t &res)
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template<uint8_t BYTES, typename UINT = uint32_t>
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bool get_uint_bytes_be(const uint8_t *data, uint32_t index, uint32_t length, UINT &res)
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{
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if ((index + (BYTES - 1)) >= length) {
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return false;
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}
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res = ovms_bytes_impl_t<BYTES>::get_bytes_int(data, index);
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res = ovms_bytes_impl_t<BYTES,UINT>::get_bytes_uint(data, index);
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return true;
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}
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@ -435,14 +479,15 @@ bool get_uint_bytes_be(const uint8_t *data, uint32_t index, uint32_t length, ui
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* get_int_bytes_be: Access to signed integer (big-endian) in a data buffer.
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* @return true If within bounds
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*/
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template<uint8_t BYTES>
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bool get_int_bytes_be(const uint8_t *data, uint32_t index, uint32_t length, int32_t &res)
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template<uint8_t BYTES, typename INT = int32_t>
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bool get_int_bytes_be(const uint8_t *data, uint32_t index, uint32_t length, INT &res)
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{
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if ((index + (BYTES - 1)) >= length)
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return false;
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typedef typename std::make_unsigned<INT>::type uint_t;
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uint32_t uresult = ovms_bytes_impl_t<BYTES>::get_bytes_int(data, index);
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res = reinterpret_cast<int32_t &>(uresult);
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uint_t uresult = ovms_bytes_impl_t<BYTES,uint_t>::get_bytes_uint(data, index);
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res = sign_extend<uint_t, INT, BYTES * 8 - 1>(uresult);
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return true;
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}
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@ -450,12 +495,12 @@ bool get_int_bytes_be(const uint8_t *data, uint32_t index, uint32_t length, int
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* get_uint_buff_be: Access to unsigned integer (big-endian) in a vector data buffer.
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* @return true If successful
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*/
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template<uint8_t BYTES>
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bool get_uint_buff_be(const std::string &data, uint32_t index, uint32_t &ures)
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template<uint8_t BYTES, typename UINT = uint32_t>
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bool get_uint_buff_be(const std::string &data, uint32_t index, UINT &ures)
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{
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if ((index + (BYTES - 1)) >= data.size())
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return false;
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ures = ovms_bytes_impl_t<BYTES>::get_bytes_int(reinterpret_cast<const uint8_t *>(data.data()), index);
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ures = ovms_bytes_impl_t<BYTES,UINT>::get_bytes_uint(reinterpret_cast<const uint8_t *>(data.data()), index);
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return true;
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}
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@ -463,14 +508,15 @@ bool get_uint_buff_be(const std::string &data, uint32_t index, uint32_t &ures)
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* get_buff_int_be: Access to signed integer (big-endian) in a std::string data buffer.
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* @return true If successful
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*/
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template<uint8_t BYTES>
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bool get_buff_int_be(const std::string &data, uint32_t index, int32_t &res)
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template<uint8_t BYTES, typename INT = int32_t>
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bool get_buff_int_be(const std::string &data, uint32_t index, INT &res)
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{
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if ((index + (BYTES - 1)) >= data.size())
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return false;
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uint32_t ures = ovms_bytes_impl_t<BYTES>::get_bytes_int(reinterpret_cast<const uint8_t *>(data.data()), index);
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typedef typename std::make_unsigned<INT>::type uint_t;
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uint_t ures = ovms_bytes_impl_t<BYTES,uint_t>::get_bytes_uint(reinterpret_cast<const uint8_t *>(data.data()), index);
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res = sign_extend < uint32_t, int32_t, BYTES * 8 - 1 > (ures);
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res = sign_extend<uint_t, INT, BYTES * 8 - 1>(ures);
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return true;
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}
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@ -478,37 +524,38 @@ bool get_buff_int_be(const std::string &data, uint32_t index, int32_t &res)
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* get_bytes_uint_le: Access to unsigned integer (little-endian) in a data buffer.
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* @return true If within bounds
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*/
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template<uint8_t BYTES>
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bool get_bytes_uint_le(const uint8_t *data, uint32_t index, uint32_t length, uint32_t &res)
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template<uint8_t BYTES, typename UINT = uint32_t>
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bool get_bytes_uint_le(const uint8_t *data, uint32_t index, uint32_t length, UINT &res)
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{
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if ((index + (BYTES - 1)) >= length)
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return false;
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res = get_bytes_le_impl_t<BYTES>::get_bytes_int(data, index);
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res = get_bytes_le_impl_t<BYTES,UINT>::get_bytes_uint(data, index);
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return true;
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}
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/** Access to unsigned integer (little-endian) in a vector data buffer.
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* @return true If within bounds
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*/
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template<uint8_t BYTES>
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bool get_buff_uint_le(const std::string &data, uint32_t index, uint32_t &res)
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template<uint8_t BYTES, typename UINT = uint32_t>
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bool get_buff_uint_le(const std::string &data, uint32_t index, UINT &res)
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{
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if ((index + (BYTES - 1)) >= data.size())
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return false;
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res = get_bytes_le_impl_t<BYTES>::get_bytes_int(reinterpret_cast<const uint8_t *>(data.data()), index);
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res = get_bytes_le_impl_t<BYTES,UINT>::get_bytes_uint(reinterpret_cast<const uint8_t *>(data.data()), index);
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return true;
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}
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/** Access to signed integer (little-endian) in a vector data buffer.
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* @return true If within bounds
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*/
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template<uint8_t BYTES>
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bool get_buff_int_le(const std::string &data, uint32_t index, int32_t &res)
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template<uint8_t BYTES, typename INT = int32_t>
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bool get_buff_int_le(const std::string &data, uint32_t index, INT &res)
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{
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if ((index + (BYTES - 1)) >= data.size())
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return false;
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uint32_t uresult = ovms_bytes_impl_t<BYTES>::get_bytes_int(reinterpret_cast<const uint8_t *>(data.data()), index);
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res = sign_extend < uint32_t, int32_t, BYTES * 8 - 1 > (uresult);
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typedef typename std::make_unsigned<INT>::type uint_t;
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uint_t uresult = ovms_bytes_impl_t<BYTES,uint_t>::get_bytes_uint(reinterpret_cast<const uint8_t *>(data.data()), index);
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res = sign_extend < uint_t, INT, BYTES * 8 - 1 > (uresult);
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return true;
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}
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