#include "Memory.h"

#include <algorithm>
#include <cstddef>
#include <vector>

#include "Assembly.h"


Memory::Memory() noexcept :
	content {}
{}


void Memory::apply(AssemblyContext ctx)
{
	ctx.bind("/read", [&](std::size_t len, std::size_t off) -> std::vector<char> { return read(len, off); });
	ctx.bind("/write", [&](const std::vector<char> data, std::size_t off) -> bool { return write(data, off); });
}


auto Memory::read(std::size_t len, std::size_t off) const -> std::vector<char>
{
	if (content.size() < off)
		return {};
	auto real_len = std::min(len, content.size() - off);
	auto data = content.data() + off;
	return {data, data + real_len};
}


bool Memory::write(const std::vector<char> data, std::size_t off)
{
	if (content.size() < off || data.empty())
		return false;
	std::size_t in_data = 0;
	std::size_t in_content = off;
	for (; in_data < data.size() && in_content < content.size(); ++in_data, ++in_content)
		content[in_content] = data[in_data];
	return true;
}