Byte Swapping Functions

Functions
posh_u16_t	POSH_SwapU16 (posh_u16_t u)
posh_s16_t	POSH_SwapS16 (posh_s16_t u)
posh_u32_t	POSH_SwapU32 (posh_u32_t u)
posh_s32_t	POSH_SwapS32 (posh_s32_t u)

Detailed Description

These functions perform byte swapping of 16 and 32-bit values. The 64-bit versions of these functions are documented under SixtyFourBit

Function Documentation

posh_s16_t POSH_SwapS16

(

posh_s16_t

v)

Byte swaps a 16-bit signed value

Parameters

v[in]

signed 16-bit input value to swap

Returns

a byte swapped version of v

Remarks

This just calls back to the unsigned version, since byte swapping is independent of sign. However, we still provide this function to avoid signed/unsigned mismatch compiler warnings.

Definition at line 217 of file posh.cpp.

References POSH_SwapU16().

{
    return (posh_s16_t) POSH_SwapU16( v );
}

posh_s32_t POSH_SwapS32

(

posh_s32_t

v)

Byte swaps a 32-bit signed value

Parameters

v[in]

signed 32-bit input value to swap

Returns

a byte swapped version of v

Remarks

This just calls back to the unsigned version, since byte swapping is independent of sign. However, we still provide this function to avoid signed/unsigned mismatch compiler warnings.

Definition at line 249 of file posh.cpp.

References POSH_SwapU32().

{
    return (posh_s32_t) POSH_SwapU32( (posh_u32_t) v );
}

posh_u16_t POSH_SwapU16

(

posh_u16_t

v)

Byte swaps a 16-bit unsigned value

Parameters

v[in]

unsigned 16-bit input value to swap

Returns

a byte swapped version of v

Definition at line 198 of file posh.cpp.

Referenced by POSH_SwapS16().

{
    posh_u16_t swapped;

    swapped  = v<<8;
    swapped |= v>>8;

    return swapped;
}

posh_u32_t POSH_SwapU32

(

posh_u32_t

v)

Byte swaps a 32-bit unsigned value

Parameters

v[in]

unsigned 32-bit input value to swap

Returns

a byte swapped version of v

Definition at line 228 of file posh.cpp.

Referenced by POSH_BigFloatBits(), POSH_FloatFromBigBits(), POSH_FloatFromLittleBits(), POSH_LittleFloatBits(), and POSH_SwapS32().

{
    posh_u32_t swapped;

    swapped  = (v&0xFF)<<24;
    swapped |= (v&0xFF00)<<8;
    swapped |= (v>>8)&0xFF00;
    swapped |= (v>>24);

    return swapped;
}