Ykkrosh
83271ec816
Fix VFS root directory failing IsDirectory, which breaks the search for textures.xml. Fix incompatible change to loose cache name determination. This was SVN commit r9092.
149 lines
4.6 KiB
C++
149 lines
4.6 KiB
C++
/* Copyright (C) 2010 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "precompiled.h"
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#include "CacheLoader.h"
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#include "lib/path_util.h"
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#include "ps/CLogger.h"
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#include "maths/MD5.h"
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#include <iomanip>
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CCacheLoader::CCacheLoader(PIVFS vfs, const std::wstring& fileExtension) :
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m_VFS(vfs), m_FileExtension(fileExtension)
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{
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}
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LibError CCacheLoader::TryLoadingCached(const VfsPath& sourcePath, const MD5& initialHash, u32 version, VfsPath& loadPath)
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{
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VfsPath archiveCachePath = ArchiveCachePath(sourcePath);
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// Try the archive cache file first
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if (CanUseArchiveCache(sourcePath, archiveCachePath))
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{
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loadPath = archiveCachePath;
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return INFO::OK;
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}
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// Fail if no source or archive cache
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LibError err = m_VFS->GetFileInfo(sourcePath, NULL);
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if (err < 0)
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{
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LOGERROR(L"Failed to find file: \"%ls\"", sourcePath.c_str());
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return err;
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}
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// Look for loose cache of source file
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VfsPath looseCachePath = LooseCachePath(sourcePath, initialHash, version);
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// If the loose cache file exists, use it
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if (m_VFS->GetFileInfo(looseCachePath, NULL) >= 0)
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{
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loadPath = looseCachePath;
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return INFO::OK;
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}
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// No cache - we'll need to regenerate it
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loadPath = looseCachePath;
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return INFO::SKIPPED;
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}
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bool CCacheLoader::CanUseArchiveCache(const VfsPath& sourcePath, const VfsPath& archiveCachePath)
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{
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// We want to use the archive cache whenever possible,
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// unless it's superseded by a source file that the user has edited
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size_t archiveCachePriority = 0;
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size_t sourcePriority = 0;
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bool archiveCacheExists = (m_VFS->GetFilePriority(archiveCachePath, &archiveCachePriority) >= 0);
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// Can't use it if there's no cache
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if (!archiveCacheExists)
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return false;
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bool sourceExists = (m_VFS->GetFilePriority(sourcePath, &sourcePriority) >= 0);
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// Must use the cache if there's no source
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if (!sourceExists)
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return true;
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// If source file is from a higher-priority mod than archive cache,
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// don't use the old cache
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if (archiveCachePriority < sourcePriority)
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return false;
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// If source file is more recent than the archive cache (i.e. the user has edited it),
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// don't use the old cache
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FileInfo sourceInfo, archiveCacheInfo;
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if (m_VFS->GetFileInfo(sourcePath, &sourceInfo) >= 0 &&
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m_VFS->GetFileInfo(archiveCachePath, &archiveCacheInfo) >= 0)
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{
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const double howMuchNewer = difftime(sourceInfo.MTime(), archiveCacheInfo.MTime());
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const double threshold = 2.0; // FAT timestamp resolution [seconds]
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if (howMuchNewer > threshold)
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return false;
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}
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// Otherwise we can use the cache
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return true;
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}
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VfsPath CCacheLoader::ArchiveCachePath(const VfsPath& sourcePath)
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{
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return Path::ChangeExtension(sourcePath, Path::Extension(sourcePath) + L".cached" + m_FileExtension);
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}
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VfsPath CCacheLoader::LooseCachePath(const VfsPath& sourcePath, const MD5& initialHash, u32 version)
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{
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FileInfo fileInfo;
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if (m_VFS->GetFileInfo(sourcePath, &fileInfo) < 0)
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{
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debug_warn(L"source file disappeared"); // this should never happen
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return VfsPath();
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}
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u64 mtime = (u64)fileInfo.MTime() & ~1; // skip lowest bit, since zip and FAT don't preserve it
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u64 size = (u64)fileInfo.Size();
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// Construct a hash of the file data and settings.
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MD5 hash = initialHash;
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hash.Update((const u8*)&mtime, sizeof(mtime));
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hash.Update((const u8*)&size, sizeof(size));
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hash.Update((const u8*)&version, sizeof(version));
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// these are local cached files, so we don't care about endianness etc
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// Use a short prefix of the full hash (we don't need high collision-resistance),
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// converted to hex
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u8 digest[MD5::DIGESTSIZE];
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hash.Final(digest);
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std::wstringstream digestPrefix;
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digestPrefix << std::hex;
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for (size_t i = 0; i < 8; ++i)
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digestPrefix << std::setfill(L'0') << std::setw(2) << (int)digest[i];
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// Construct the final path
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return Path::Join("cache", Path::ChangeExtension(sourcePath, Path::Extension(sourcePath) + std::wstring(L".") + digestPrefix.str() + m_FileExtension));
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// TODO: we should probably include the mod name, once that's possible (http://trac.wildfiregames.com/ticket/564)
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}
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