AuroraRuntime/Source/Parse/AuBase64.cpp

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

    File: AuBase64.cpp
    Date: 2021-6-12
    Author: Reece
***/
#include <Source/RuntimeInternal.hpp>
#include "AuBase64.hpp"
#include <tomcrypt.h>

namespace Aurora::Parse
{
    AUKN_SYM bool Base64Decode(const AuString &in, AuByteBuffer &decoded, bool bUrl)
    {
        int iRet;
        unsigned long uLength = (unsigned long)in.size();
     
        auto writeView = decoded.GetOrAllocateLinearWriteable(uLength);
        if (!writeView)
        {
            SysPushErrorMem();
            return {};
        }

        if (bUrl)
        {
            iRet = ::base64url_decode(AuReinterpretCast<const char *>(decoded.writePtr),
                                      (unsigned long)uLength,
                                      AuReinterpretCast<unsigned char *>(&decoded[0]),
                                      &uLength);
        }
        else
        {
            iRet = ::base64_decode(AuReinterpretCast<const char *>(decoded.writePtr),
                                   (unsigned long)uLength,
                                   AuReinterpretCast<unsigned char *>(&decoded[0]),
                                   &uLength);
        }

        if (iRet != CRYPT_OK)
        {
            return false;
        }

        decoded.writePtr += uLength;
        return true;
    }

    AUKN_SYM bool Base64Encode(const Memory::MemoryViewRead &input, AuString &encoded, bool bUrl)
    {
        int iRet;
        unsigned long uOutLength = input.length + (input.length / 3.0) + 16;

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

        if (bUrl)
        {
            iRet = ::base64url_encode(AuReinterpretCast<const unsigned char*>(input.ptr),
                                      (unsigned long)input.length,
                                      &encoded[0], 
                                      &uOutLength);
        }
        else
        {
            iRet = ::base64_encode(AuReinterpretCast<const unsigned char*>(input.ptr),
                                   (unsigned long)input.length,
                                   &encoded[0],
                                   &uOutLength);
        }

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

        return iRet == CRYPT_OK;
    }
}