module libxdiff.mmblocks;

import xdiff;

import libxdiff.init;

import std.exception : enforce;
import core.stdc.errno : errno;
import core.stdc.string : strerror;
import std.string : fromStringz;
import std.conv : to;

private enum DEFAULT_BSIZE = 8 * 1024;

final class MMBlocks : MM
{
public:
	this()
	{
		_inner = initMmfile(DEFAULT_BSIZE);
	}

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

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