mirror of https://github.com/OpenMW/openmw.git
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
545 lines
16 KiB
C++
545 lines
16 KiB
C++
#include "esmreader.hpp"
|
|
|
|
#include "readerscache.hpp"
|
|
|
|
#include <components/esm3/cellid.hpp>
|
|
#include <components/esm3/loadcell.hpp>
|
|
#include <components/files/conversion.hpp>
|
|
#include <components/files/openfile.hpp>
|
|
#include <components/misc/strings/algorithm.hpp>
|
|
|
|
#include <filesystem>
|
|
#include <fstream>
|
|
#include <sstream>
|
|
#include <stdexcept>
|
|
|
|
namespace ESM
|
|
{
|
|
|
|
ESM_Context ESMReader::getContext()
|
|
{
|
|
// Update the file position before returning
|
|
mCtx.filePos = mEsm->tellg();
|
|
return mCtx;
|
|
}
|
|
|
|
ESMReader::ESMReader()
|
|
: mRecordFlags(0)
|
|
, mBuffer(50 * 1024)
|
|
, mEncoder(nullptr)
|
|
, mFileSize(0)
|
|
{
|
|
clearCtx();
|
|
mCtx.index = 0;
|
|
}
|
|
|
|
void ESMReader::restoreContext(const ESM_Context& rc)
|
|
{
|
|
// Reopen the file if necessary
|
|
if (mCtx.filename != rc.filename)
|
|
openRaw(rc.filename);
|
|
|
|
// Copy the data
|
|
mCtx = rc;
|
|
|
|
// Make sure we seek to the right place
|
|
mEsm->seekg(mCtx.filePos);
|
|
}
|
|
|
|
void ESMReader::close()
|
|
{
|
|
mEsm.reset();
|
|
clearCtx();
|
|
mHeader.blank();
|
|
}
|
|
|
|
void ESMReader::clearCtx()
|
|
{
|
|
mCtx.filename.clear();
|
|
mCtx.leftFile = 0;
|
|
mCtx.leftRec = 0;
|
|
mCtx.leftSub = 0;
|
|
mCtx.subCached = false;
|
|
mCtx.recName.clear();
|
|
mCtx.subName.clear();
|
|
}
|
|
|
|
void ESMReader::resolveParentFileIndices(ReadersCache& readers)
|
|
{
|
|
mCtx.parentFileIndices.clear();
|
|
for (const Header::MasterData& mast : getGameFiles())
|
|
{
|
|
const std::string& fname = mast.name;
|
|
int index = getIndex();
|
|
for (int i = 0; i < getIndex(); i++)
|
|
{
|
|
const ESM::ReadersCache::BusyItem reader = readers.get(static_cast<std::size_t>(i));
|
|
if (reader->getFileSize() == 0)
|
|
continue; // Content file in non-ESM format
|
|
const auto fnamecandidate = Files::pathToUnicodeString(reader->getName().filename());
|
|
if (Misc::StringUtils::ciEqual(fname, fnamecandidate))
|
|
{
|
|
index = i;
|
|
break;
|
|
}
|
|
}
|
|
mCtx.parentFileIndices.push_back(index);
|
|
}
|
|
}
|
|
|
|
bool ESMReader::applyContentFileMapping(FormId& id)
|
|
{
|
|
if (mContentFileMapping && id.hasContentFile())
|
|
{
|
|
auto iter = mContentFileMapping->find(id.mContentFile);
|
|
if (iter == mContentFileMapping->end())
|
|
return false;
|
|
id.mContentFile = iter->second;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
ESM::RefId ESMReader::getCellId()
|
|
{
|
|
if (mHeader.mFormatVersion <= ESM::MaxUseEsmCellIdFormatVersion)
|
|
{
|
|
ESM::CellId cellId;
|
|
cellId.load(*this);
|
|
if (cellId.mPaged)
|
|
{
|
|
return ESM::RefId::esm3ExteriorCell(cellId.mIndex.mX, cellId.mIndex.mY);
|
|
}
|
|
else
|
|
{
|
|
return ESM::RefId::stringRefId(cellId.mWorldspace);
|
|
}
|
|
}
|
|
return getHNRefId("NAME");
|
|
}
|
|
|
|
void ESMReader::openRaw(std::unique_ptr<std::istream>&& stream, const std::filesystem::path& name)
|
|
{
|
|
close();
|
|
mEsm = std::move(stream);
|
|
mCtx.filename = name;
|
|
mEsm->seekg(0, mEsm->end);
|
|
mCtx.leftFile = mFileSize = mEsm->tellg();
|
|
mEsm->seekg(0, mEsm->beg);
|
|
}
|
|
|
|
void ESMReader::openRaw(const std::filesystem::path& filename)
|
|
{
|
|
openRaw(Files::openBinaryInputFileStream(filename), filename);
|
|
}
|
|
|
|
void ESMReader::open(std::unique_ptr<std::istream>&& stream, const std::filesystem::path& name)
|
|
{
|
|
openRaw(std::move(stream), name);
|
|
|
|
if (getRecName() != "TES3")
|
|
fail("Not a valid Morrowind file");
|
|
|
|
getRecHeader();
|
|
|
|
mHeader.load(*this);
|
|
}
|
|
|
|
void ESMReader::open(const std::filesystem::path& file)
|
|
{
|
|
open(Files::openBinaryInputFileStream(file), file);
|
|
}
|
|
|
|
std::string ESMReader::getHNOString(NAME name)
|
|
{
|
|
if (isNextSub(name))
|
|
return getHString();
|
|
return "";
|
|
}
|
|
|
|
ESM::RefId ESMReader::getHNORefId(NAME name)
|
|
{
|
|
if (isNextSub(name))
|
|
return getRefId();
|
|
return ESM::RefId();
|
|
}
|
|
|
|
void ESMReader::skipHNORefId(NAME name)
|
|
{
|
|
if (isNextSub(name))
|
|
skipHRefId();
|
|
}
|
|
|
|
std::string ESMReader::getHNString(NAME name)
|
|
{
|
|
getSubNameIs(name);
|
|
return getHString();
|
|
}
|
|
|
|
RefId ESMReader::getHNRefId(NAME name)
|
|
{
|
|
getSubNameIs(name);
|
|
return getRefId();
|
|
}
|
|
|
|
std::string ESMReader::getHString()
|
|
{
|
|
return std::string(getHStringView());
|
|
}
|
|
|
|
std::string_view ESMReader::getHStringView()
|
|
{
|
|
getSubHeader();
|
|
|
|
if (mHeader.mFormatVersion > MaxStringRefIdFormatVersion)
|
|
return getStringView(mCtx.leftSub);
|
|
|
|
// Hack to make MultiMark.esp load. Zero-length strings do not
|
|
// occur in any of the official mods, but MultiMark makes use of
|
|
// them. For some reason, they break the rules, and contain a byte
|
|
// (value 0) even if the header says there is no data. If
|
|
// Morrowind accepts it, so should we.
|
|
if (mCtx.leftSub == 0 && hasMoreSubs() && !mEsm->peek())
|
|
{
|
|
// Skip the following zero byte
|
|
mCtx.leftRec--;
|
|
char c;
|
|
getT(c);
|
|
return std::string_view();
|
|
}
|
|
|
|
return getStringView(mCtx.leftSub);
|
|
}
|
|
|
|
RefId ESMReader::getRefId()
|
|
{
|
|
if (mHeader.mFormatVersion <= MaxStringRefIdFormatVersion)
|
|
return ESM::RefId::stringRefId(getHStringView());
|
|
getSubHeader();
|
|
return getRefIdImpl(mCtx.leftSub);
|
|
}
|
|
|
|
void ESMReader::skipHString()
|
|
{
|
|
getSubHeader();
|
|
|
|
// Hack to make MultiMark.esp load. Zero-length strings do not
|
|
// occur in any of the official mods, but MultiMark makes use of
|
|
// them. For some reason, they break the rules, and contain a byte
|
|
// (value 0) even if the header says there is no data. If
|
|
// Morrowind accepts it, so should we.
|
|
if (mHeader.mFormatVersion <= MaxStringRefIdFormatVersion && mCtx.leftSub == 0 && hasMoreSubs()
|
|
&& !mEsm->peek())
|
|
{
|
|
// Skip the following zero byte
|
|
mCtx.leftRec--;
|
|
skipT<char>();
|
|
return;
|
|
}
|
|
|
|
skip(mCtx.leftSub);
|
|
}
|
|
|
|
void ESMReader::skipHRefId()
|
|
{
|
|
skipHString();
|
|
}
|
|
|
|
void ESMReader::getHExact(void* p, int size)
|
|
{
|
|
getSubHeader();
|
|
if (size != static_cast<int>(mCtx.leftSub))
|
|
reportSubSizeMismatch(size, mCtx.leftSub);
|
|
getExact(p, size);
|
|
}
|
|
|
|
// Read the given number of bytes from a named subrecord
|
|
void ESMReader::getHNExact(void* p, int size, NAME name)
|
|
{
|
|
getSubNameIs(name);
|
|
getHExact(p, size);
|
|
}
|
|
|
|
FormId ESMReader::getFormId(bool wide, NAME tag)
|
|
{
|
|
FormId res;
|
|
if (wide)
|
|
getHNTSized<8>(res, tag);
|
|
else
|
|
getHNT(res.mIndex, tag);
|
|
return res;
|
|
}
|
|
|
|
// Get the next subrecord name and check if it matches the parameter
|
|
void ESMReader::getSubNameIs(NAME name)
|
|
{
|
|
getSubName();
|
|
if (mCtx.subName != name)
|
|
fail("Expected subrecord " + name.toString() + " but got " + mCtx.subName.toString());
|
|
}
|
|
|
|
bool ESMReader::isNextSub(NAME name)
|
|
{
|
|
if (!hasMoreSubs())
|
|
return false;
|
|
|
|
getSubName();
|
|
|
|
// If the name didn't match, then mark the it as 'cached' so it's
|
|
// available for the next call to getSubName.
|
|
mCtx.subCached = (mCtx.subName != name);
|
|
|
|
// If subCached is false, then subName == name.
|
|
return !mCtx.subCached;
|
|
}
|
|
|
|
bool ESMReader::peekNextSub(NAME name)
|
|
{
|
|
if (!hasMoreSubs())
|
|
return false;
|
|
|
|
getSubName();
|
|
|
|
mCtx.subCached = true;
|
|
return mCtx.subName == name;
|
|
}
|
|
|
|
// Read subrecord name. This gets called a LOT, so I've optimized it
|
|
// slightly.
|
|
void ESMReader::getSubName()
|
|
{
|
|
// If the name has already been read, do nothing
|
|
if (mCtx.subCached)
|
|
{
|
|
mCtx.subCached = false;
|
|
return;
|
|
}
|
|
|
|
// reading the subrecord data anyway.
|
|
const std::size_t subNameSize = decltype(mCtx.subName)::sCapacity;
|
|
getExact(mCtx.subName.mData, static_cast<int>(subNameSize));
|
|
mCtx.leftRec -= static_cast<std::uint32_t>(subNameSize);
|
|
}
|
|
|
|
void ESMReader::skipHSub()
|
|
{
|
|
getSubHeader();
|
|
skip(mCtx.leftSub);
|
|
}
|
|
|
|
void ESMReader::skipHSubSize(int size)
|
|
{
|
|
skipHSub();
|
|
if (static_cast<int>(mCtx.leftSub) != size)
|
|
reportSubSizeMismatch(mCtx.leftSub, size);
|
|
}
|
|
|
|
void ESMReader::skipHSubUntil(NAME name)
|
|
{
|
|
while (hasMoreSubs() && !isNextSub(name))
|
|
{
|
|
mCtx.subCached = false;
|
|
skipHSub();
|
|
}
|
|
if (hasMoreSubs())
|
|
mCtx.subCached = true;
|
|
}
|
|
|
|
void ESMReader::getSubHeader()
|
|
{
|
|
if (mCtx.leftRec < static_cast<std::streamsize>(sizeof(mCtx.leftSub)))
|
|
fail("End of record while reading sub-record header: " + std::to_string(mCtx.leftRec) + " < "
|
|
+ std::to_string(sizeof(mCtx.leftSub)));
|
|
|
|
// Get subrecord size
|
|
getUint(mCtx.leftSub);
|
|
mCtx.leftRec -= sizeof(mCtx.leftSub);
|
|
|
|
// Adjust number of record bytes left; may go negative
|
|
mCtx.leftRec -= mCtx.leftSub;
|
|
}
|
|
|
|
NAME ESMReader::getRecName()
|
|
{
|
|
if (!hasMoreRecs())
|
|
fail("No more records, getRecName() failed");
|
|
if (hasMoreSubs())
|
|
fail("Previous record contains unread bytes");
|
|
|
|
// We went out of the previous record's bounds. Backtrack.
|
|
if (mCtx.leftRec < 0)
|
|
mEsm->seekg(mCtx.leftRec, std::ios::cur);
|
|
|
|
getName(mCtx.recName);
|
|
mCtx.leftFile -= decltype(mCtx.recName)::sCapacity;
|
|
|
|
// Make sure we don't carry over any old cached subrecord
|
|
// names. This can happen in some cases when we skip parts of a
|
|
// record.
|
|
mCtx.subCached = false;
|
|
|
|
return mCtx.recName;
|
|
}
|
|
|
|
void ESMReader::skipRecord()
|
|
{
|
|
skip(mCtx.leftRec);
|
|
mCtx.leftRec = 0;
|
|
mCtx.subCached = false;
|
|
}
|
|
|
|
void ESMReader::getRecHeader(uint32_t& flags)
|
|
{
|
|
if (mCtx.leftFile < static_cast<std::streamsize>(3 * sizeof(uint32_t)))
|
|
fail("End of file while reading record header");
|
|
|
|
std::uint32_t leftRec = 0;
|
|
getUint(leftRec);
|
|
mCtx.leftRec = static_cast<std::streamsize>(leftRec);
|
|
getUint(flags); // This header entry is always zero
|
|
getUint(flags);
|
|
mCtx.leftFile -= 3 * sizeof(uint32_t);
|
|
|
|
// Check that sizes add up
|
|
if (mCtx.leftFile < mCtx.leftRec)
|
|
reportSubSizeMismatch(mCtx.leftFile, mCtx.leftRec);
|
|
|
|
// Adjust number of bytes mCtx.left in file
|
|
mCtx.leftFile -= mCtx.leftRec;
|
|
}
|
|
|
|
/*************************************************************************
|
|
*
|
|
* Lowest level data reading and misc methods
|
|
*
|
|
*************************************************************************/
|
|
|
|
std::string ESMReader::getMaybeFixedStringSize(std::size_t size)
|
|
{
|
|
if (mHeader.mFormatVersion > MaxLimitedSizeStringsFormatVersion)
|
|
{
|
|
StringSizeType storedSize = 0;
|
|
getT(storedSize);
|
|
if (storedSize > mCtx.leftSub)
|
|
fail("String does not fit subrecord (" + std::to_string(storedSize) + " > "
|
|
+ std::to_string(mCtx.leftSub) + ")");
|
|
size = static_cast<std::size_t>(storedSize);
|
|
}
|
|
|
|
return std::string(getStringView(size));
|
|
}
|
|
|
|
RefId ESMReader::getMaybeFixedRefIdSize(std::size_t size)
|
|
{
|
|
if (mHeader.mFormatVersion <= MaxStringRefIdFormatVersion)
|
|
return RefId::stringRefId(getMaybeFixedStringSize(size));
|
|
return getRefIdImpl(mCtx.leftSub);
|
|
}
|
|
|
|
std::string_view ESMReader::getStringView(std::size_t size)
|
|
{
|
|
if (mBuffer.size() <= size)
|
|
// Add some extra padding to reduce the chance of having to resize
|
|
// again later.
|
|
mBuffer.resize(3 * size);
|
|
|
|
// And make sure the string is zero terminated
|
|
mBuffer[size] = 0;
|
|
|
|
// read ESM data
|
|
char* ptr = mBuffer.data();
|
|
getExact(ptr, size);
|
|
|
|
size = strnlen(ptr, size);
|
|
|
|
// Convert to UTF8 and return
|
|
if (mEncoder != nullptr)
|
|
return mEncoder->getUtf8(std::string_view(ptr, size));
|
|
|
|
return std::string_view(ptr, size);
|
|
}
|
|
|
|
RefId ESMReader::getRefId(std::size_t size)
|
|
{
|
|
if (mHeader.mFormatVersion <= MaxStringRefIdFormatVersion)
|
|
return ESM::RefId::stringRefId(getStringView(size));
|
|
return getRefIdImpl(size);
|
|
}
|
|
|
|
RefId ESMReader::getRefIdImpl(std::size_t size)
|
|
{
|
|
RefIdType refIdType = RefIdType::Empty;
|
|
getT(refIdType);
|
|
|
|
switch (refIdType)
|
|
{
|
|
case RefIdType::Empty:
|
|
return RefId();
|
|
case RefIdType::SizedString:
|
|
{
|
|
const std::size_t minSize = sizeof(refIdType) + sizeof(StringSizeType);
|
|
if (size < minSize)
|
|
fail("Requested RefId record size is too small (" + std::to_string(size) + " < "
|
|
+ std::to_string(minSize) + ")");
|
|
StringSizeType storedSize = 0;
|
|
getT(storedSize);
|
|
const std::size_t maxSize = size - minSize;
|
|
if (storedSize > maxSize)
|
|
fail("RefId string does not fit subrecord size (" + std::to_string(storedSize) + " > "
|
|
+ std::to_string(maxSize) + ")");
|
|
return RefId::stringRefId(getStringView(storedSize));
|
|
}
|
|
case RefIdType::UnsizedString:
|
|
if (size < sizeof(refIdType))
|
|
fail("Requested RefId record size is too small (" + std::to_string(size) + " < "
|
|
+ std::to_string(sizeof(refIdType)) + ")");
|
|
return RefId::stringRefId(getStringView(size - sizeof(refIdType)));
|
|
case RefIdType::FormId:
|
|
{
|
|
FormId formId{};
|
|
getTSized<8>(formId);
|
|
if (applyContentFileMapping(formId))
|
|
return RefId(formId);
|
|
else
|
|
return RefId(); // content file was removed from load order
|
|
}
|
|
case RefIdType::Generated:
|
|
{
|
|
std::uint64_t generated{};
|
|
getExact(&generated, sizeof(std::uint64_t));
|
|
return RefId::generated(generated);
|
|
}
|
|
case RefIdType::Index:
|
|
{
|
|
RecNameInts recordType{};
|
|
getExact(&recordType, sizeof(std::uint32_t));
|
|
std::uint32_t index{};
|
|
getExact(&index, sizeof(std::uint32_t));
|
|
return RefId::index(recordType, index);
|
|
}
|
|
case RefIdType::ESM3ExteriorCell:
|
|
{
|
|
int32_t x, y;
|
|
getExact(&x, sizeof(std::int32_t));
|
|
getExact(&y, sizeof(std::int32_t));
|
|
return RefId::esm3ExteriorCell(x, y);
|
|
}
|
|
}
|
|
|
|
fail("Unsupported RefIdType: " + std::to_string(static_cast<unsigned>(refIdType)));
|
|
}
|
|
|
|
[[noreturn]] void ESMReader::fail(const std::string& msg)
|
|
{
|
|
std::stringstream ss;
|
|
|
|
ss << "ESM Error: " << msg;
|
|
ss << "\n File: " << Files::pathToUnicodeString(mCtx.filename);
|
|
ss << "\n Record: " << mCtx.recName.toStringView();
|
|
ss << "\n Subrecord: " << mCtx.subName.toStringView();
|
|
if (mEsm.get())
|
|
ss << "\n Offset: 0x" << std::hex << mEsm->tellg();
|
|
throw std::runtime_error(ss.str());
|
|
}
|
|
|
|
}
|