module sdiff.mmblocks;

import xdiff;

import sdiff.init;

import std.exception : enforce;
import std.conv : to;

private enum DEFAULT_BSIZE = 64 * 1024;

final class MMBlocks : MM
{
public:
	this()
	{
		super(DEFAULT_BSIZE);
	}

	~this()
	{
		if (_inner.head !is null)
			xdl_free_mmfile(&_inner);
	}

	package(sdiff) mmfile_t* ptr() @trusted
	{
		return &_inner;
	}

	const(ubyte)[] slice() const @trusted
	{
		enforce(isCompact(), "MMFile must be compact for asSliceConst");
		auto h = _inner.head;
		return (h is null || h.size <= 0) ? [] : (cast(const(ubyte)*) h.ptr)[0 .. h.size.to!size_t];
	}

	override string toString() const @trusted
	{
		return cast(string) slice();
	}
}