quake-tools/source/quam/wad2.cc

#include "quam/wad2.h"

namespace Wad2 {
	enum Compression {
		CompressNone,
		CompressLZSS,
	};
}

struct Wad2Header {
	quint32 dirNum;
	quint32 dirOffset;
};

struct Wad2Entry {
	std::string   name;
	Arc::FileType type;
	Arc::File     file;
};

static Arc::FileType getFileType(int n) {
	switch(n) {
		case 0:  return Arc::FileType::Normal;
		case 1:  return Arc::FileType::Label;
		case 64: return Arc::FileType::Palette;
		case 65: return Arc::FileType::Texture;
		case 66: return Arc::FileType::Picture;
		case 67: return Arc::FileType::Sound;
		case 68: return Arc::FileType::MipTexture;
		default: throw EnumError("invalid file type");
	}
}

static Wad2Header readWad2Header(std::istream &st) {
	auto magic = readBytes<4>(st);

	if(magic != std::array{'W', 'A', 'D', '2'}) {
		throw FileFormatError("not a wad2 file (invalid magic number)");
	}

	Wad2Header hdr;
	hdr.dirNum    = readLE<quint32>(st);
	hdr.dirOffset = readLE<quint32>(st);
	return hdr;
}

static Wad2Entry readWad2Entry(std::istream &st) {
	auto entOffset = readLE<quint32>(st);
	auto entSize   = readLE<quint32>(st);
	auto entCSize  = readLE<quint32>(st);
	auto entType   = readByte(st);
	auto entCompr  = readByte(st);
	/*   padding  */ readBytes<2>(st);
	auto entName   = readBytes<16>(st);

	if(entSize != entCSize || entCompr != Wad2::CompressNone) {
		throw UnimplementedError("compressed files not supported");
	}

	auto pos = st.tellg();

	st.seekg(entOffset);

	Arc::File file;
	file.resize(entSize);
	st.read(file.data(), entSize);

	st.seekg(pos);

	Wad2Entry ent;
	ent.name = ntbsToString(entName);
	ent.file = std::move(file);
	ent.type = getFileType(entType);
	return ent;
}

Arc::Dir readWad2(std::istream &st) {
	auto hdr = readWad2Header(st);
	st.seekg(hdr.dirOffset);

	Arc::Dir root;

	for(quint32 i = 0; i < hdr.dirNum; i++) {
		auto ent = readWad2Entry(st);
		root.emplace_back(std::move(ent.file), std::move(ent.name), ent.type);
	}

	return root;
}

// EOF