static SigV4Status_t lowercaseHexEncode()

in source/sigv4.c [1017:1055]
33 lines of code
3 McCabe index (conditional complexity)

static SigV4Status_t lowercaseHexEncode( const SigV4String_t * pInputStr,
                                         SigV4String_t * pHexOutput )
{
    SigV4Status_t returnStatus = SigV4Success;
    static const char digitArr[] = "0123456789abcdef";
    char * hex = NULL;
    size_t i = 0U;
    const uint8_t * bytes;

    assert( pInputStr != NULL );
    assert( pHexOutput != NULL );
    assert( pInputStr->pData != NULL );
    assert( pHexOutput->pData != NULL );

    hex = pHexOutput->pData;
    bytes = ( const uint8_t * ) pInputStr->pData;

    /* Hex string notification of binary data takes twice the size. */
    if( pHexOutput->dataLen < ( pInputStr->dataLen * 2U ) )
    {
        returnStatus = SigV4InsufficientMemory;
        LOG_INSUFFICIENT_MEMORY_ERROR( "hex encode",
                                       ( pInputStr->dataLen * 2U ) - pHexOutput->dataLen );
    }
    else
    {
        for( i = 0; i < pInputStr->dataLen; i++ )
        {
            *hex = digitArr[ ( bytes[ i ] & 0xF0U ) >> 4 ];
            hex++;
            *hex = digitArr[ ( bytes[ i ] & 0x0FU ) ];
            hex++;
        }

        pHexOutput->dataLen = pInputStr->dataLen * 2U;
    }

    return returnStatus;
}