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#include "Reader.h"
#include <zlib.h>
#include <cstring>
#include <format>
#include <fstream>
#include <stdexcept>
namespace TESFile
{
template <ReaderHandler Handler>
inline void Reader<Handler>::parse(const std::filesystem::path& path, Handler& handler)
{
std::ifstream stream;
stream.open(path, std::ios_base::binary | std::ios_base::in);
if (!stream.good()) {
throw std::runtime_error(std::strerror(errno));
}
parse(stream, handler);
}
template <ReaderHandler Handler>
inline void Reader<Handler>::parse(std::istream& stream, Handler& handler)
{
parsePluginInfo(stream, handler);
while (stream.good() && stream.peek() != std::char_traits<char>::eof()) {
parseRecord(stream, handler);
}
}
template <ReaderHandler Handler>
inline std::uint32_t Reader<Handler>::parsePluginInfo(std::istream& stream,
Handler& handler)
{
const RecordHeader header = readType<RecordHeader>(stream);
if (stream.fail()) {
throw std::runtime_error("record incomplete");
}
if (header.type == "TES4"_ts) {
if (header.old.firstChunk == "HEDR"_ts) {
chunkFormat_ = TESFormat::Oblivion;
headerSize_ = HeaderSize_Oblivion;
stream.seekg(HeaderSize_Oblivion - sizeof(RecordHeader), std::istream::cur);
} else {
chunkFormat_ = TESFormat::Standard;
headerSize_ = sizeof(RecordHeader);
}
} else if (header.type == "TES3"_ts) {
chunkFormat_ = TESFormat::Morrowind;
headerSize_ = HeaderSize_Morrowind;
stream.seekg(HeaderSize_Morrowind - sizeof(RecordHeader), std::istream::cur);
} else {
throw std::runtime_error(
std::format("Unrecognized plugin info type: '{}'", header.type.value));
}
return handleForm(stream, header, handler);
}
template <ReaderHandler Handler>
inline std::uint32_t Reader<Handler>::parseRecord(std::istream& stream,
Handler& handler)
{
RecordHeader header;
stream.read(reinterpret_cast<char*>(&header), headerSize_);
if (stream.fail()) {
throw std::runtime_error("record incomplete");
}
if (header.type == "GRUP"_ts) {
return handleGroup(stream, header, handler);
} else {
return handleForm(stream, header, handler);
}
}
template <ReaderHandler Handler>
inline std::uint32_t Reader<Handler>::handleForm(std::istream& stream,
const RecordHeader& header,
Handler& handler)
{
std::uint32_t dataSize = header.dataSize;
const bool compressed = header.formData.flags & RecordFlags::Compressed;
// Check for Oblivion plugin data
uint16_t version = 0;
if (header.old.firstChunk.string() != "HEDR") {
version = header.version;
}
if (handler.Form(
FormData(header.type, header.formData.flags, header.formData.formId, version))) {
std::string data;
data.resize(dataSize);
stream.read(data.data(), dataSize);
if (stream.fail()) {
throw std::runtime_error("chunk incomplete");
}
std::istringstream chunkstream;
if (!compressed) {
chunkstream.str(std::move(data));
} else {
if (data.size() < 4) {
throw std::runtime_error("chunk incomplete");
}
std::memcpy(&dataSize, data.data(), sizeof(dataSize));
std::string inflated;
inflated.resize(dataSize);
int zret;
::z_stream zstreambuf{
.next_in = reinterpret_cast<z_const ::Bytef*>(data.data() + sizeof(dataSize)),
.avail_in = static_cast<::uInt>(data.size() - sizeof(dataSize)),
.next_out = reinterpret_cast<::Bytef*>(inflated.data()),
.avail_out = static_cast<::uInt>(inflated.size()),
.zalloc = Z_NULL,
.zfree = Z_NULL,
.opaque = Z_NULL,
};
zret = ::inflateInit(&zstreambuf);
if (zret != Z_OK) {
throw std::runtime_error("zlib failed to init");
}
zret = ::inflate(&zstreambuf, Z_FINISH);
if (zret != Z_STREAM_END) {
throw std::runtime_error("zlib failed to read data");
}
zret = ::inflateEnd(&zstreambuf);
chunkstream.str(std::move(inflated));
}
while (dataSize != 0) {
const std::uint32_t fieldSize = parseChunk(chunkstream, handler);
if (fieldSize > dataSize) {
throw std::runtime_error(
std::format("Subrecord exceeded record size ({}-{})", dataSize, fieldSize));
}
dataSize -= fieldSize;
}
if constexpr (requires { handler.EndForm(); }) {
handler.EndForm();
}
} else {
stream.seekg(dataSize, std::istream::cur);
if (stream.fail()) {
throw std::runtime_error("record incomplete");
}
}
return headerSize_ + header.dataSize;
}
template <ReaderHandler Handler>
inline std::uint32_t Reader<Handler>::handleGroup(std::istream& stream,
const RecordHeader& header,
Handler& handler)
{
std::uint32_t dataSize = header.dataSize - headerSize_;
if (handler.Group(GroupData(header.groupData.label, header.groupData.groupType))) {
while (dataSize != 0) {
const std::uint32_t recordSize = parseRecord(stream, handler);
if (recordSize > dataSize) {
throw std::runtime_error(
std::format("Record exceeded group size ({}-{})", dataSize, recordSize));
}
dataSize -= recordSize;
}
if constexpr (requires { handler.EndGroup(); }) {
handler.EndGroup();
}
} else {
stream.seekg(dataSize, std::istream::cur);
if (stream.fail()) {
throw std::runtime_error("group incomplete");
}
}
return header.dataSize;
}
template <ReaderHandler Handler>
inline std::uint32_t Reader<Handler>::parseChunk(std::istream& stream, Handler& handler)
{
ChunkHeader header = readType<ChunkHeader>(stream);
if (stream.fail()) {
throw std::runtime_error("chunk header incomplete");
}
std::uint32_t readSize = sizeof(ChunkHeader) + header.dataSize;
std::uint32_t dataSize = header.dataSize;
if (header.type == "XXXX"_ts) {
if (dataSize != 4) {
throw std::runtime_error("XXXX field has invalid size");
}
dataSize = readType<std::uint32_t>(stream);
header = readType<ChunkHeader>(stream);
if (stream.fail()) {
throw std::runtime_error("chunk size incomplete");
}
readSize += sizeof(ChunkHeader) + dataSize;
}
if (handler.Chunk(header.type)) {
std::string field;
field.resize(dataSize);
stream.read(field.data(), dataSize);
if (stream.fail()) {
throw std::runtime_error("chunk data incomplete");
}
std::istringstream data(std::move(field));
data.exceptions(std::ios_base::failbit);
handler.Data(data);
} else {
stream.seekg(dataSize, std::istream::cur);
if (stream.fail()) {
throw std::runtime_error("chunk incomplete");
}
}
return readSize;
}
} // namespace TESFile
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