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87 lines
2.5 KiB
C++
87 lines
2.5 KiB
C++
#include "reader.hpp"
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//#ifdef NDEBUG
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//#undef NDEBUG
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//#endif
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#include <cassert>
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#include <stdexcept>
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#include <components/files/constrainedfilestream.hpp>
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#include "components/esm3/esmreader.hpp"
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#include "components/esm4/reader.hpp"
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namespace ESM
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{
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Reader* Reader::getReader(const std::string &filename)
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{
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Files::IStreamPtr esmStream(Files::openConstrainedFileStream(filename));
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std::uint32_t modVer = 0; // get the first 4 bytes of the record header only
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esmStream->read((char*)&modVer, sizeof(modVer));
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if (esmStream->gcount() == sizeof(modVer))
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{
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esmStream->seekg(0);
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if (modVer == ESM4::REC_TES4)
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{
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return new ESM4::Reader(std::move(esmStream), filename);
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}
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else
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{
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//return new ESM3::ESMReader(esmStream, filename);
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}
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}
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throw std::runtime_error("Unknown file format");
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}
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bool Reader::getStringImpl(std::string& str, std::size_t size,
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std::istream& stream, const ToUTF8::StatelessUtf8Encoder* encoder, bool hasNull)
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{
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std::size_t newSize = size;
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if (encoder)
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{
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std::string input(size, '\0');
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stream.read(input.data(), size);
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if (stream.gcount() == static_cast<std::streamsize>(size))
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{
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encoder->getUtf8(input, ToUTF8::BufferAllocationPolicy::FitToRequiredSize, str);
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return true;
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}
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}
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else
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{
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if (hasNull)
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newSize -= 1; // don't read the null terminator yet
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str.resize(newSize); // assumed C++11
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stream.read(&str[0], newSize);
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if (static_cast<std::size_t>(stream.gcount()) == newSize)
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{
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if (hasNull)
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{
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char ch;
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stream.read(&ch, 1); // read the null terminator
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assert (ch == '\0'
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&& "ESM4::Reader::getString string is not terminated with a null");
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}
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#if 0
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else
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{
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// NOTE: normal ESMs don't but omwsave has locals or spells with null terminator
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assert (str[newSize - 1] != '\0'
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&& "ESM4::Reader::getString string is unexpectedly terminated with a null");
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}
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#endif
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return true;
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}
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}
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str.clear();
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return false; // FIXME: throw instead?
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}
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}
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