Retro68/Elf2Mac/Reloc.cc

/*
	 Copyright 2017 Wolfgang Thaller.

	 This file is part of Retro68.

	 Retro68 is free software: you can redistribute it and/or modify
	 it under the terms of the GNU General Public License as published by
	 the Free Software Foundation, either version 3 of the License, or
	 (at your option) any later version.

	 Retro68 is distributed in the hope that it will be useful,
	 but WITHOUT ANY WARRANTY; without even the implied warranty of
	 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	 GNU General Public License for more details.

	 You should have received a copy of the GNU General Public License
	 along with Retro68.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "Reloc.h"
#include <sstream>
#include "BinaryIO.h"

Reloc::Reloc()
{
}

Reloc::Reloc(const GElf_Rela &rela)
    : GElf_Rela(rela), relocBase(RelocBase::code)
{
}

std::string SerializeRelocsUncompressed(std::vector<RuntimeReloc> relocs)
{
	std::ostringstream out;
	for(const auto& r : relocs)
	{
		longword(out, r.offset | ((int)r.base << 24));
	}
	longword(out, -1);
	return out.str();
}

std::string SerializeRelocs(std::vector<RuntimeReloc> relocs)
{
	std::ostringstream out;
	uint32_t offset = -1;

	for(const auto& r : relocs)
	{
		uint32_t delta = r.offset - offset;
		offset = r.offset;

		uint32_t base = (uint32_t) r.base;

		uint32_t encoded = (delta << 2) | base;

		while(encoded >= 128)
		{
			byte(out, (encoded & 0x7F) | 0x80);
			encoded >>= 7;
		}
		byte(out, encoded);
	}

	byte(out, 0);

	return out.str();
}