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git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6000 dfc29bdd-3216-0410-991c-e03cc46cb475
278 lines
6.1 KiB
C++
278 lines
6.1 KiB
C++
// Copyright (C) 2002-2012 Nikolaus Gebhardt
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// Copyright (C) 2009-2012 Christian Stehno
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// This file is part of the "Irrlicht Engine".
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// For conditions of distribution and use, see copyright notice in irrlicht.h
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// Based on the NPK reader from Irrlicht
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#include "CNPKReader.h"
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#ifdef __IRR_COMPILE_WITH_NPK_ARCHIVE_LOADER_
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#include "os.h"
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#include "coreutil.h"
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#ifdef _DEBUG
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#define IRR_DEBUG_NPK_READER
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#endif
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namespace irr
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{
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namespace io
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{
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namespace
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{
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bool isHeaderValid(const SNPKHeader& header)
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{
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const c8* const tag = header.Tag;
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return tag[0] == '0' &&
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tag[1] == 'K' &&
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tag[2] == 'P' &&
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tag[3] == 'N';
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}
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} // end namespace
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//! Constructor
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CArchiveLoaderNPK::CArchiveLoaderNPK( io::IFileSystem* fs)
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: FileSystem(fs)
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{
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#ifdef _DEBUG
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setDebugName("CArchiveLoaderNPK");
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#endif
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}
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//! returns true if the file maybe is able to be loaded by this class
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bool CArchiveLoaderNPK::isALoadableFileFormat(const io::path& filename) const
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{
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return core::hasFileExtension(filename, "npk");
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}
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//! Check to see if the loader can create archives of this type.
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bool CArchiveLoaderNPK::isALoadableFileFormat(E_FILE_ARCHIVE_TYPE fileType) const
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{
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return fileType == EFAT_NPK;
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}
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//! Creates an archive from the filename
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/** \param file File handle to check.
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\return Pointer to newly created archive, or 0 upon error. */
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IFileArchive* CArchiveLoaderNPK::createArchive(const io::path& filename, bool ignoreCase, bool ignorePaths) const
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{
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IFileArchive *archive = 0;
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io::IReadFile* file = FileSystem->createAndOpenFile(filename);
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if (file)
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{
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archive = createArchive(file, ignoreCase, ignorePaths);
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file->drop ();
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}
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return archive;
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}
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//! creates/loads an archive from the file.
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//! \return Pointer to the created archive. Returns 0 if loading failed.
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IFileArchive* CArchiveLoaderNPK::createArchive(io::IReadFile* file, bool ignoreCase, bool ignorePaths) const
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{
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IFileArchive *archive = 0;
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if ( file )
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{
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file->seek ( 0 );
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archive = new CNPKReader(file, ignoreCase, ignorePaths);
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}
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return archive;
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}
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//! Check if the file might be loaded by this class
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/** Check might look into the file.
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\param file File handle to check.
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\return True if file seems to be loadable. */
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bool CArchiveLoaderNPK::isALoadableFileFormat(io::IReadFile* file) const
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{
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SNPKHeader header;
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file->read(&header, sizeof(header));
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return isHeaderValid(header);
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}
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/*!
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NPK Reader
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*/
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CNPKReader::CNPKReader(IReadFile* file, bool ignoreCase, bool ignorePaths)
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: CFileList((file ? file->getFileName() : io::path("")), ignoreCase, ignorePaths), File(file)
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{
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#ifdef _DEBUG
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setDebugName("CNPKReader");
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#endif
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if (File)
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{
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File->grab();
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if (scanLocalHeader())
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sort();
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else
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os::Printer::log("Failed to load NPK archive.");
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}
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}
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CNPKReader::~CNPKReader()
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{
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if (File)
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File->drop();
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}
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const IFileList* CNPKReader::getFileList() const
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{
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return this;
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}
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bool CNPKReader::scanLocalHeader()
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{
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SNPKHeader header;
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// Read and validate the header
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File->read(&header, sizeof(header));
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if (!isHeaderValid(header))
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return false;
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// Seek to the table of contents
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#ifdef __BIG_ENDIAN__
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header.Offset = os::Byteswap::byteswap(header.Offset);
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header.Length = os::Byteswap::byteswap(header.Length);
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#endif
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header.Offset += 8;
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core::stringc dirName;
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bool inTOC=true;
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// Loop through each entry in the table of contents
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while (inTOC && (File->getPos() < File->getSize()))
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{
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// read an entry
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char tag[4]={0};
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SNPKFileEntry entry;
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File->read(tag, 4);
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const int numTag = MAKE_IRR_ID(tag[3],tag[2],tag[1],tag[0]);
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int size;
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bool isDir=true;
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switch (numTag)
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{
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case MAKE_IRR_ID('D','I','R','_'):
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{
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File->read(&size, 4);
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readString(entry.Name);
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entry.Length=0;
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entry.Offset=0;
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#ifdef IRR_DEBUG_NPK_READER
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os::Printer::log("Dir", entry.Name);
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#endif
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}
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break;
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case MAKE_IRR_ID('F','I','L','E'):
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{
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File->read(&size, 4);
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File->read(&entry.Offset, 4);
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File->read(&entry.Length, 4);
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readString(entry.Name);
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isDir=false;
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#ifdef IRR_DEBUG_NPK_READER
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os::Printer::log("File", entry.Name);
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#endif
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#ifdef __BIG_ENDIAN__
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entry.Offset = os::Byteswap::byteswap(entry.Offset);
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entry.Length = os::Byteswap::byteswap(entry.Length);
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#endif
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}
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break;
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case MAKE_IRR_ID('D','E','N','D'):
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{
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File->read(&size, 4);
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entry.Name="";
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entry.Length=0;
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entry.Offset=0;
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const s32 pos = dirName.findLast('/', dirName.size()-2);
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if (pos==-1)
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dirName="";
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else
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dirName=dirName.subString(0, pos);
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#ifdef IRR_DEBUG_NPK_READER
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os::Printer::log("Dirend", dirName);
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#endif
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}
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break;
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default:
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inTOC=false;
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}
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// skip root dir
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if (isDir)
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{
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if (!entry.Name.size() || (entry.Name==".") || (entry.Name=="<noname>"))
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continue;
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dirName += entry.Name;
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dirName += "/";
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}
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#ifdef IRR_DEBUG_NPK_READER
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os::Printer::log("Name", entry.Name);
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#endif
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addItem((isDir?dirName:dirName+entry.Name), entry.Offset+header.Offset, entry.Length, isDir);
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}
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return true;
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}
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//! opens a file by file name
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IReadFile* CNPKReader::createAndOpenFile(const io::path& filename)
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{
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s32 index = findFile(filename, false);
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if (index != -1)
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return createAndOpenFile(index);
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return 0;
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}
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//! opens a file by index
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IReadFile* CNPKReader::createAndOpenFile(u32 index)
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{
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if (index >= Files.size() )
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return 0;
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const SFileListEntry &entry = Files[index];
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return createLimitReadFile( entry.FullName, File, entry.Offset, entry.Size );
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}
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void CNPKReader::readString(core::stringc& name)
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{
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short stringSize;
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char buf[256];
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File->read(&stringSize, 2);
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#ifdef __BIG_ENDIAN__
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stringSize = os::Byteswap::byteswap(stringSize);
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#endif
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name.reserve(stringSize);
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while(stringSize)
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{
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const short next = core::min_(stringSize, (short)255);
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File->read(buf,next);
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buf[next]=0;
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name.append(buf);
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stringSize -= next;
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}
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}
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} // end namespace io
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} // end namespace irr
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#endif // __IRR_COMPILE_WITH_NPK_ARCHIVE_LOADER_
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