/***
    Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: AuBase32.cpp
    Date: 2021-6-12
    Author: Reece
***/
#include <Source/RuntimeInternal.hpp>
#include "AuBase32.hpp"
#include <tomcrypt.h>

namespace Aurora::Parse
{
    AUKN_SYM bool Base32Decode(const AuString &in, AuByteBuffer &decoded)
    {
        int iRet;
        unsigned long uLength = in.size();
    
        auto writeView = decoded.GetOrAllocateLinearWriteable(uLength);
        if (!writeView)
        {
            SysPushErrorMem();
            return false;
        }

        iRet = ::base32_decode(AuReinterpretCast<const char *>(decoded.writePtr),
                               (unsigned long)uLength,
                               AuReinterpretCast<unsigned char *>(&decoded[0]), 
                               &uLength,
                               BASE32_RFC4648);
        if (iRet != CRYPT_OK)
        {
            return false;
        }

        decoded.writePtr += uLength;
        return true;
    }

    AUKN_SYM bool Base32Encode(const Memory::MemoryViewRead &input, AuString &encoded)
    {
        unsigned long uOutLength = ((input.length * 8 + 4) / 5) + 5;
     
        if (!AuTryResize(encoded, uOutLength))
        {
            SysPushErrorMem();
            return false;
        }

        auto iRet = ::base32_encode(AuReinterpretCast<const unsigned char *>(input.ptr),
                                    (unsigned long)input.length,
                                    &encoded[0],
                                    &uOutLength,
                                    BASE32_RFC4648);

        if (!AuTryResize(encoded, uOutLength))
        {
            SysPushErrorMem();
            return false;
        }
            
        return iRet == CRYPT_OK;
    }
}