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nl::Weave::Encoding::LittleEndian

This namespace provides functions for:

Summary

  • Performing byte reordering, relative to the host system, by value of little endian byte ordered values for 16-, 32-, and 64-bit types.
  • Safely performing simple, efficient memory-mapped accesses, potentially to unaligned memory locations, with or without byte reordering, to 8-, 16-, 32-, and 64-bit little endian byte ordered quantities, both with and without pointer management.

On little endian host systems no actual byte reordering will occur. On other systems, byte reordering is peformed as appropriate.

Functions
Get16(const uint8_t *p)
uint16_t
Perform a, potentially unaligned, memory read of the little endian byte ordered 16-bit value from the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in target system byte ordering.
Get32(const uint8_t *p)
uint32_t
Perform a, potentially unaligned, memory read of the little endian byte ordered 32-bit value from the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in target system byte ordering.
Get64(const uint8_t *p)
uint64_t
Perform a, potentially unaligned, memory read of the little endian byte ordered 64-bit value from the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in target system byte ordering.
HostSwap16(uint16_t v)
uint16_t
This conditionally performs, as necessary for the target system, a byte order swap by value of the specified 16-bit value, presumed to be in little endian byte ordering to the target system (i.e.
HostSwap32(uint32_t v)
uint32_t
This conditionally performs, as necessary for the target system, a byte order swap by value of the specified 32-bit value, presumed to be in little endian byte ordering to the target system (i.e.
HostSwap64(uint64_t v)
uint64_t
This conditionally performs, as necessary for the target system, a byte order swap by value of the specified 64-bit value, presumed to be in little endian byte ordering to the target system (i.e.
Put16(uint8_t *p, uint16_t v)
void
Perform a, potentially unaligned, memory write of the target system byte ordered 16-bit value to the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in little endian byte ordering.
Put32(uint8_t *p, uint32_t v)
void
Perform a, potentially unaligned, memory write of the target system byte ordered 32-bit value to the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in little endian byte ordering.
Put64(uint8_t *p, uint64_t v)
void
Perform a, potentially unaligned, memory write of the target system byte ordered 64-bit value to the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in little endian byte ordering.
Read16(uint8_t *& p)
uint16_t
Perform a, potentially unaligned, memory read of the little endian byte ordered 16-bit value from the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in target system byte ordering, and increment the pointer by 16-bits (2 bytes).
Read16(const uint8_t *& p)
uint16_t
Perform a, potentially unaligned, memory read of the little endian byte ordered 16-bit value from the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in target system byte ordering, and increment the pointer by 16-bits (2 bytes).
Read32(uint8_t *& p)
uint32_t
Perform a, potentially unaligned, memory read of the little endian byte ordered 32-bit value from the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in target system byte ordering, and increment the pointer by 32-bits (4 bytes).
Read32(const uint8_t *& p)
uint32_t
Perform a, potentially unaligned, memory read of the little endian byte ordered 32-bit value from the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in target system byte ordering, and increment the pointer by 32-bits (4 bytes).
Read64(uint8_t *& p)
uint64_t
Perform a, potentially unaligned, memory read of the little endian byte ordered 64-bit value from the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in target system byte ordering, and increment the pointer by 64-bits (8 bytes).
Read64(const uint8_t *& p)
uint64_t
Perform a, potentially unaligned, memory read of the little endian byte ordered 64-bit value from the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in target system byte ordering, and increment the pointer by 64-bits (8 bytes).
Write16(uint8_t *& p, uint16_t v)
void
Perform a, potentially unaligned, memory write of the target system byte ordered 16-bit value to the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in little endian byte ordering.
Write32(uint8_t *& p, uint32_t v)
void
Perform a, potentially unaligned, memory write of the target system byte ordered 32-bit value to the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in little endian byte ordering.
Write64(uint8_t *& p, uint64_t v)
void
Perform a, potentially unaligned, memory write of the target system byte ordered 64-bit value to the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in little endian byte ordering.

Functions

Get16

uint16_t Get16(
  const uint8_t *p
)

Perform a, potentially unaligned, memory read of the little endian byte ordered 16-bit value from the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in target system byte ordering.

Details
Parameters
[in] p
A pointer address, potentially unaligned, to read the 16-bit little endian byte ordered value from.
Returns
The 16-bit value at the specified pointer address, if necessary, byte reordered.

Get32

uint32_t Get32(
  const uint8_t *p
)

Perform a, potentially unaligned, memory read of the little endian byte ordered 32-bit value from the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in target system byte ordering.

Details
Parameters
[in] p
A pointer address, potentially unaligned, to read the 32-bit little endian byte ordered value from.
Returns
The 32-bit value at the specified pointer address, if necessary, byte reordered.

Get64

uint64_t Get64(
  const uint8_t *p
)

Perform a, potentially unaligned, memory read of the little endian byte ordered 64-bit value from the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in target system byte ordering.

Details
Parameters
[in] p
A pointer address, potentially unaligned, to read the 64-bit little endian byte ordered value from.
Returns
The 64-bit value at the specified pointer address, if necessary, byte reordered.

HostSwap16

uint16_t HostSwap16(
  uint16_t v
)

This conditionally performs, as necessary for the target system, a byte order swap by value of the specified 16-bit value, presumed to be in little endian byte ordering to the target system (i.e.

host) byte ordering.

Consequently, on little endian target systems, this is a no-op and on big endian target systems, this performs a reordering.

Details
Parameters
[in] v
The 16-bit value to be byte order swapped.
Returns
The input value, if necessary, byte order swapped.

HostSwap32

uint32_t HostSwap32(
  uint32_t v
)

This conditionally performs, as necessary for the target system, a byte order swap by value of the specified 32-bit value, presumed to be in little endian byte ordering to the target system (i.e.

host) byte ordering.

Consequently, on little endian target systems, this is a no-op and on big endian target systems, this performs a reordering.

Details
Parameters
[in] v
The 32-bit value to be byte order swapped.
Returns
The input value, if necessary, byte order swapped.

HostSwap64

uint64_t HostSwap64(
  uint64_t v
)

This conditionally performs, as necessary for the target system, a byte order swap by value of the specified 64-bit value, presumed to be in little endian byte ordering to the target system (i.e.

host) byte ordering.

Consequently, on little endian target systems, this is a no-op and on big endian target systems, this performs a reordering.

Details
Parameters
[in] v
The 64-bit value to be byte order swapped.
Returns
The input value, if necessary, byte order swapped.

Put16

void Put16(
  uint8_t *p,
  uint16_t v
)

Perform a, potentially unaligned, memory write of the target system byte ordered 16-bit value to the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in little endian byte ordering.

Details
Parameters
[in] p
A pointer address, potentially unaligned, to write the target system byte ordered 16-bit value to in little endian byte ordering.
[in] v
The 16-bit value to write, if necessary, byte reordered.

Put32

void Put32(
  uint8_t *p,
  uint32_t v
)

Perform a, potentially unaligned, memory write of the target system byte ordered 32-bit value to the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in little endian byte ordering.

Details
Parameters
[in] p
A pointer address, potentially unaligned, to write the target system byte ordered 32-bit value to in little endian byte ordering.
[in] v
The 32-bit value to write, if necessary, byte reordered.

Put64

void Put64(
  uint8_t *p,
  uint64_t v
)

Perform a, potentially unaligned, memory write of the target system byte ordered 64-bit value to the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in little endian byte ordering.

Details
Parameters
[in] p
A pointer address, potentially unaligned, to write the target system byte ordered 64-bit value to in little endian byte ordering.
[in] v
The 64-bit value to write, if necessary, byte reordered.

Read16

uint16_t Read16(
  uint8_t *& p
)

Perform a, potentially unaligned, memory read of the little endian byte ordered 16-bit value from the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in target system byte ordering, and increment the pointer by 16-bits (2 bytes).

Details
Parameters
[in,out] p
A reference to a pointer address, potentially unaligned, to read the 16-bit little endian byte ordered value from and to then increment by 16- bits (2 bytes).
Returns
The 16-bit value at the specified pointer address, if necessary, byte order swapped.

Read16

uint16_t Read16(
  const uint8_t *& p
)

Perform a, potentially unaligned, memory read of the little endian byte ordered 16-bit value from the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in target system byte ordering, and increment the pointer by 16-bits (2 bytes).

Details
Parameters
[in,out] p
A reference to a constant pointer address, potentially unaligned, to read the 16-bit little endian byte ordered value from and to then increment by 16- bits (2 bytes).
Returns
The 16-bit value at the specified pointer address, if necessary, byte order swapped.

Read32

uint32_t Read32(
  uint8_t *& p
)

Perform a, potentially unaligned, memory read of the little endian byte ordered 32-bit value from the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in target system byte ordering, and increment the pointer by 32-bits (4 bytes).

Details
Parameters
[in,out] p
A reference to a pointer address, potentially unaligned, to read the 32-bit little endian byte ordered value from and to then increment by 32- bits (4 bytes).
Returns
The 32-bit value at the specified pointer address, if necessary, byte order swapped.

Read32

uint32_t Read32(
  const uint8_t *& p
)

Perform a, potentially unaligned, memory read of the little endian byte ordered 32-bit value from the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in target system byte ordering, and increment the pointer by 32-bits (4 bytes).

Details
Parameters
[in,out] p
A reference to a constant pointer address, potentially unaligned, to read the 32-bit little endian byte ordered value from and to then increment by 32- bits (4 bytes).
Returns
The 32-bit value at the specified pointer address, if necessary, byte order swapped.

Read64

uint64_t Read64(
  uint8_t *& p
)

Perform a, potentially unaligned, memory read of the little endian byte ordered 64-bit value from the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in target system byte ordering, and increment the pointer by 64-bits (8 bytes).

Details
Parameters
[in,out] p
A reference to a pointer address, potentially unaligned, to read the 64-bit little endian byte ordered value from and to then increment by 64- bits (8 bytes).
Returns
The 64-bit value at the specified pointer address, if necessary, byte order swapped.

Read64

uint64_t Read64(
  const uint8_t *& p
)

Perform a, potentially unaligned, memory read of the little endian byte ordered 64-bit value from the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in target system byte ordering, and increment the pointer by 64-bits (8 bytes).

Details
Parameters
[in,out] p
A reference to a constant pointer address, potentially unaligned, to read the 64-bit little endian byte ordered value from and to then increment by 64- bits (8 bytes).
Returns
The 64-bit value at the specified pointer address, if necessary, byte order swapped.

Write16

void Write16(
  uint8_t *& p,
  uint16_t v
)

Perform a, potentially unaligned, memory write of the target system byte ordered 16-bit value to the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in little endian byte ordering.

Details
Parameters
[in] p
A reference to a pointer address, potentially unaligned, to write the target system byte ordered 16-bit value to in little endian byte ordering and to then increment by 16-bits (2 bytes).
[in] v
The 16-bit value to write, if necessary, byte order swapped.

Write32

void Write32(
  uint8_t *& p,
  uint32_t v
)

Perform a, potentially unaligned, memory write of the target system byte ordered 32-bit value to the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in little endian byte ordering.

Details
Parameters
[in] p
A reference to a pointer address, potentially unaligned, to write the target system byte ordered 32-bit value to in little endian byte ordering and to then increment by 32-bits (4 bytes).
[in] v
The 32-bit value to write, if necessary, byte order swapped.

Write64

void Write64(
  uint8_t *& p,
  uint64_t v
)

Perform a, potentially unaligned, memory write of the target system byte ordered 64-bit value to the specified pointer address, perform byte reordering, as necessary, for the target system to put the value in little endian byte ordering.

Details
Parameters
[in] p
A reference to a pointer address, potentially unaligned, to write the target system byte ordered 64-bit value to in little endian byte ordering and to then increment by 64-bits (8 bytes).
[in] v
The 64-bit value to write, if necessary, byte order swapped.