mirror of
https://github.com/juce-framework/JUCE.git
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434 lines
12 KiB
C++
434 lines
12 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library - "Jules' Utility Class Extensions"
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Copyright 2004-10 by Raw Material Software Ltd.
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------------------------------------------------------------------------------
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JUCE can be redistributed and/or modified under the terms of the GNU General
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Public License (Version 2), as published by the Free Software Foundation.
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A copy of the license is included in the JUCE distribution, or can be found
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online at www.gnu.org/licenses.
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JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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------------------------------------------------------------------------------
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To release a closed-source product which uses JUCE, commercial licenses are
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available: visit www.rawmaterialsoftware.com/juce for more information.
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==============================================================================
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*/
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#include "../../core/juce_StandardHeader.h"
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BEGIN_JUCE_NAMESPACE
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#include "juce_ZipFile.h"
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#include "../streams/juce_GZIPDecompressorInputStream.h"
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#include "../streams/juce_BufferedInputStream.h"
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#include "../streams/juce_FileInputSource.h"
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#include "juce_FileInputStream.h"
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#include "juce_FileOutputStream.h"
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#include "../../threads/juce_ScopedLock.h"
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//==============================================================================
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class ZipFile::ZipEntryInfo
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{
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public:
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ZipFile::ZipEntry entry;
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int streamOffset;
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int compressedSize;
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bool compressed;
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};
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//==============================================================================
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class ZipFile::ZipInputStream : public InputStream
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{
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public:
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//==============================================================================
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ZipInputStream (ZipFile& file_, ZipFile::ZipEntryInfo& zei)
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: file (file_),
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zipEntryInfo (zei),
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pos (0),
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headerSize (0),
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inputStream (0)
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{
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inputStream = file_.inputStream;
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if (file_.inputSource != 0)
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{
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inputStream = file.inputSource->createInputStream();
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}
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else
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{
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#if JUCE_DEBUG
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file_.numOpenStreams++;
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#endif
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}
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char buffer [30];
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if (inputStream != 0
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&& inputStream->setPosition (zei.streamOffset)
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&& inputStream->read (buffer, 30) == 30
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&& ByteOrder::littleEndianInt (buffer) == 0x04034b50)
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{
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headerSize = 30 + ByteOrder::littleEndianShort (buffer + 26)
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+ ByteOrder::littleEndianShort (buffer + 28);
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}
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}
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~ZipInputStream()
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{
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#if JUCE_DEBUG
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if (inputStream != 0 && inputStream == file.inputStream)
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file.numOpenStreams--;
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#endif
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if (inputStream != file.inputStream)
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delete inputStream;
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}
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int64 getTotalLength()
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{
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return zipEntryInfo.compressedSize;
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}
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int read (void* buffer, int howMany)
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{
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if (headerSize <= 0)
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return 0;
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howMany = (int) jmin ((int64) howMany, zipEntryInfo.compressedSize - pos);
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if (inputStream == 0)
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return 0;
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int num;
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if (inputStream == file.inputStream)
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{
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const ScopedLock sl (file.lock);
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inputStream->setPosition (pos + zipEntryInfo.streamOffset + headerSize);
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num = inputStream->read (buffer, howMany);
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}
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else
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{
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inputStream->setPosition (pos + zipEntryInfo.streamOffset + headerSize);
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num = inputStream->read (buffer, howMany);
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}
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pos += num;
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return num;
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}
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bool isExhausted()
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{
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return headerSize <= 0 || pos >= zipEntryInfo.compressedSize;
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}
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int64 getPosition()
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{
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return pos;
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}
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bool setPosition (int64 newPos)
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{
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pos = jlimit ((int64) 0, (int64) zipEntryInfo.compressedSize, newPos);
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return true;
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}
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private:
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//==============================================================================
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ZipFile& file;
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ZipEntryInfo zipEntryInfo;
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int64 pos;
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int headerSize;
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InputStream* inputStream;
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ZipInputStream (const ZipInputStream&);
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ZipInputStream& operator= (const ZipInputStream&);
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};
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//==============================================================================
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ZipFile::ZipFile (InputStream* const source_, const bool deleteStreamWhenDestroyed)
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: inputStream (source_)
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#if JUCE_DEBUG
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, numOpenStreams (0)
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#endif
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{
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if (deleteStreamWhenDestroyed)
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streamToDelete = inputStream;
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init();
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}
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ZipFile::ZipFile (const File& file)
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: inputStream (0)
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#if JUCE_DEBUG
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, numOpenStreams (0)
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#endif
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{
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inputSource = new FileInputSource (file);
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init();
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}
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ZipFile::ZipFile (InputSource* const inputSource_)
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: inputStream (0),
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inputSource (inputSource_)
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#if JUCE_DEBUG
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, numOpenStreams (0)
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#endif
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{
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init();
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}
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ZipFile::~ZipFile()
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{
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#if JUCE_DEBUG
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entries.clear();
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// If you hit this assertion, it means you've created a stream to read
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// one of the items in the zipfile, but you've forgotten to delete that
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// stream object before deleting the file.. Streams can't be kept open
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// after the file is deleted because they need to share the input
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// stream that the file uses to read itself.
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jassert (numOpenStreams == 0);
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#endif
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}
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//==============================================================================
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int ZipFile::getNumEntries() const throw()
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{
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return entries.size();
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}
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const ZipFile::ZipEntry* ZipFile::getEntry (const int index) const throw()
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{
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ZipEntryInfo* const zei = entries [index];
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return zei != 0 ? &(zei->entry) : 0;
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}
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int ZipFile::getIndexOfFileName (const String& fileName) const throw()
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{
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for (int i = 0; i < entries.size(); ++i)
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if (entries.getUnchecked (i)->entry.filename == fileName)
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return i;
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return -1;
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}
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const ZipFile::ZipEntry* ZipFile::getEntry (const String& fileName) const throw()
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{
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return getEntry (getIndexOfFileName (fileName));
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}
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InputStream* ZipFile::createStreamForEntry (const int index)
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{
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ZipEntryInfo* const zei = entries[index];
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InputStream* stream = 0;
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if (zei != 0)
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{
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stream = new ZipInputStream (*this, *zei);
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if (zei->compressed)
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{
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stream = new GZIPDecompressorInputStream (stream, true, true,
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zei->entry.uncompressedSize);
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// (much faster to unzip in big blocks using a buffer..)
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stream = new BufferedInputStream (stream, 32768, true);
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}
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}
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return stream;
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}
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class ZipFile::ZipFilenameComparator
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{
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public:
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int compareElements (const ZipFile::ZipEntryInfo* first, const ZipFile::ZipEntryInfo* second)
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{
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return first->entry.filename.compare (second->entry.filename);
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}
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};
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void ZipFile::sortEntriesByFilename()
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{
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ZipFilenameComparator sorter;
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entries.sort (sorter);
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}
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//==============================================================================
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void ZipFile::init()
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{
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ScopedPointer <InputStream> toDelete;
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InputStream* in = inputStream;
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if (inputSource != 0)
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{
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in = inputSource->createInputStream();
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toDelete = in;
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}
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if (in != 0)
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{
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int numEntries = 0;
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int pos = findEndOfZipEntryTable (in, numEntries);
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if (pos >= 0 && pos < in->getTotalLength())
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{
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const int size = (int) (in->getTotalLength() - pos);
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in->setPosition (pos);
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MemoryBlock headerData;
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if (in->readIntoMemoryBlock (headerData, size) == size)
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{
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pos = 0;
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for (int i = 0; i < numEntries; ++i)
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{
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if (pos + 46 > size)
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break;
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const char* const buffer = static_cast <const char*> (headerData.getData()) + pos;
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const int fileNameLen = ByteOrder::littleEndianShort (buffer + 28);
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if (pos + 46 + fileNameLen > size)
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break;
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ZipEntryInfo* const zei = new ZipEntryInfo();
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zei->entry.filename = String::fromUTF8 (buffer + 46, fileNameLen);
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const int time = ByteOrder::littleEndianShort (buffer + 12);
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const int date = ByteOrder::littleEndianShort (buffer + 14);
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const int year = 1980 + (date >> 9);
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const int month = ((date >> 5) & 15) - 1;
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const int day = date & 31;
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const int hours = time >> 11;
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const int minutes = (time >> 5) & 63;
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const int seconds = (time & 31) << 1;
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zei->entry.fileTime = Time (year, month, day, hours, minutes, seconds);
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zei->compressed = ByteOrder::littleEndianShort (buffer + 10) != 0;
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zei->compressedSize = ByteOrder::littleEndianInt (buffer + 20);
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zei->entry.uncompressedSize = ByteOrder::littleEndianInt (buffer + 24);
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zei->streamOffset = ByteOrder::littleEndianInt (buffer + 42);
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entries.add (zei);
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pos += 46 + fileNameLen
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+ ByteOrder::littleEndianShort (buffer + 30)
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+ ByteOrder::littleEndianShort (buffer + 32);
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}
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}
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}
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}
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}
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int ZipFile::findEndOfZipEntryTable (InputStream* input, int& numEntries)
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{
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BufferedInputStream in (input, 8192, false);
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in.setPosition (in.getTotalLength());
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int64 pos = in.getPosition();
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const int64 lowestPos = jmax ((int64) 0, pos - 1024);
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char buffer [32];
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zeromem (buffer, sizeof (buffer));
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while (pos > lowestPos)
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{
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in.setPosition (pos - 22);
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pos = in.getPosition();
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memcpy (buffer + 22, buffer, 4);
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if (in.read (buffer, 22) != 22)
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return 0;
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for (int i = 0; i < 22; ++i)
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{
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if (ByteOrder::littleEndianInt (buffer + i) == 0x06054b50)
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{
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in.setPosition (pos + i);
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in.read (buffer, 22);
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numEntries = ByteOrder::littleEndianShort (buffer + 10);
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return ByteOrder::littleEndianInt (buffer + 16);
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}
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}
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}
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return 0;
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}
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bool ZipFile::uncompressTo (const File& targetDirectory,
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const bool shouldOverwriteFiles)
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{
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for (int i = 0; i < entries.size(); ++i)
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if (! uncompressEntry (i, targetDirectory, shouldOverwriteFiles))
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return false;
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return true;
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}
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bool ZipFile::uncompressEntry (const int index,
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const File& targetDirectory,
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bool shouldOverwriteFiles)
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{
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const ZipEntryInfo* zei = entries [index];
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if (zei != 0)
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{
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const File targetFile (targetDirectory.getChildFile (zei->entry.filename));
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if (zei->entry.filename.endsWithChar ('/'))
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{
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targetFile.createDirectory(); // (entry is a directory, not a file)
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}
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else
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{
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ScopedPointer<InputStream> in (createStreamForEntry (index));
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if (in != 0)
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{
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if (shouldOverwriteFiles && ! targetFile.deleteFile())
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return false;
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if ((! targetFile.exists()) && targetFile.getParentDirectory().createDirectory())
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{
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ScopedPointer<FileOutputStream> out (targetFile.createOutputStream());
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if (out != 0)
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{
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out->writeFromInputStream (*in, -1);
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out = 0;
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targetFile.setCreationTime (zei->entry.fileTime);
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targetFile.setLastModificationTime (zei->entry.fileTime);
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targetFile.setLastAccessTime (zei->entry.fileTime);
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return true;
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}
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}
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}
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}
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}
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return false;
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}
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END_JUCE_NAMESPACE
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