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Compress.cpp
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//
// Compress.cpp
//
// $Id: //poco/1.4/Zip/src/Compress.cpp#1 $
//
// Library: Zip
// Package: Zip
// Module: Compress
//
// Copyright (c) 2007, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/Zip/Compress.h"
#include "Poco/Zip/ZipLocalFileHeader.h"
#include "Poco/Zip/ZipStream.h"
#include "Poco/Zip/ZipArchiveInfo.h"
#include "Poco/Zip/ZipDataInfo.h"
#include "Poco/Zip/ZipException.h"
#include "Poco/StreamCopier.h"
#include "Poco/File.h"
#include "Poco/FileStream.h"
namespace Poco {
namespace Zip {
Compress::Compress(std::ostream& out, bool seekableOut):
_out(out),
_seekableOut(seekableOut),
_files(),
_infos(),
_dirs(),
_offset(0)
{
}
Compress::~Compress()
{
}
void Compress::addEntry(std::istream& in, const Poco::DateTime& lastModifiedAt, const Poco::Path& fileName, ZipCommon::CompressionMethod cm, ZipCommon::CompressionLevel cl)
{
std::string fn = ZipUtil::validZipEntryFileName(fileName);
if (_files.size() >= 65535)
throw ZipException("Maximum number of entries for a ZIP file reached: 65535");
if (!in.good())
throw ZipException("Invalid input stream");
std::streamoff localHeaderOffset = _offset;
ZipLocalFileHeader hdr(fileName, lastModifiedAt, cm, cl);
hdr.setStartPos(localHeaderOffset);
ZipOutputStream zipOut(_out, hdr, _seekableOut);
Poco::StreamCopier::copyStream(in, zipOut);
zipOut.close();
hdr.setStartPos(localHeaderOffset); // reset again now that compressed Size is known
_offset = hdr.getEndPos();
if (hdr.searchCRCAndSizesAfterData())
_offset += ZipDataInfo::getFullHeaderSize();
_files.insert(std::make_pair(fileName.toString(Poco::Path::PATH_UNIX), hdr));
poco_assert (_out);
ZipFileInfo nfo(hdr);
nfo.setOffset(localHeaderOffset);
_infos.insert(std::make_pair(fileName.toString(Poco::Path::PATH_UNIX), nfo));
EDone.notify(this, hdr);
}
void Compress::addFileRaw(std::istream& in, const ZipLocalFileHeader& h, const Poco::Path& fileName)
{
std::string fn = ZipUtil::validZipEntryFileName(fileName);
//bypass the header of the input stream and point to the first byte of the data payload
in.seekg(h.getDataStartPos(), std::ios_base::beg);
if (_files.size() >= 65535)
throw ZipException("Maximum number of entries for a ZIP file reached: 65535");
if (!in.good())
throw ZipException("Invalid input stream");
std::streamoff localHeaderOffset = _offset;
ZipLocalFileHeader hdr(h);
hdr.setFileName(fn, h.isDirectory());
hdr.setStartPos(localHeaderOffset);
//bypass zipoutputstream
//write the header directly
std::string header = hdr.createHeader();
_out.write(header.c_str(), static_cast<std::streamsize>(header.size()));
// now fwd the payload to _out in chunks of size CHUNKSIZE
Poco::UInt32 totalSize = hdr.getCompressedSize();
if (totalSize > 0)
{
Poco::Buffer<char> buffer(COMPRESS_CHUNK_SIZE);
Poco::UInt32 remaining = totalSize;
while(remaining > 0)
{
if (remaining > COMPRESS_CHUNK_SIZE)
{
in.read(buffer.begin(), COMPRESS_CHUNK_SIZE);
std::streamsize n = in.gcount();
poco_assert_dbg (n == COMPRESS_CHUNK_SIZE);
_out.write(buffer.begin(), n);
remaining -= COMPRESS_CHUNK_SIZE;
}
else
{
in.read(buffer.begin(), remaining);
std::streamsize n = in.gcount();
poco_assert_dbg (n == remaining);
_out.write(buffer.begin(), n);
remaining = 0;
}
}
}
//write optional block afterwards
if (hdr.searchCRCAndSizesAfterData())
{
ZipDataInfo info(in, false);
_out.write(info.getRawHeader(), static_cast<std::streamsize>(info.getFullHeaderSize()));
}
hdr.setStartPos(localHeaderOffset); // reset again now that compressed Size is known
_offset = hdr.getEndPos();
if (hdr.searchCRCAndSizesAfterData())
_offset += ZipDataInfo::getFullHeaderSize();
_files.insert(std::make_pair(fileName.toString(Poco::Path::PATH_UNIX), hdr));
poco_assert (_out);
ZipFileInfo nfo(hdr);
nfo.setOffset(localHeaderOffset);
_infos.insert(std::make_pair(fileName.toString(Poco::Path::PATH_UNIX), nfo));
EDone.notify(this, hdr);
}
void Compress::addFile(std::istream& in, const Poco::DateTime& lastModifiedAt, const Poco::Path& fileName, ZipCommon::CompressionMethod cm, ZipCommon::CompressionLevel cl)
{
if (!fileName.isFile())
throw ZipException("Not a file: "+ fileName.toString());
if (fileName.depth() > 1)
{
addDirectory(fileName.parent(), lastModifiedAt);
}
addEntry(in, lastModifiedAt, fileName, cm, cl);
}
void Compress::addFile(const Poco::Path& file, const Poco::Path& fileName, ZipCommon::CompressionMethod cm, ZipCommon::CompressionLevel cl)
{
Poco::File aFile(file);
Poco::FileInputStream in(file.toString());
if (fileName.depth() > 1)
{
Poco::File aParent(file.parent());
addDirectory(fileName.parent(), aParent.getLastModified());
}
addFile(in, aFile.getLastModified(), fileName, cm, cl);
}
void Compress::addDirectory(const Poco::Path& entryName, const Poco::DateTime& lastModifiedAt)
{
if (!entryName.isDirectory())
throw ZipException("Not a directory: "+ entryName.toString());
std::string fileStr = entryName.toString(Poco::Path::PATH_UNIX);
if (_files.find(fileStr) != _files.end())
return; // ignore duplicate add
if (_files.size() >= 65535)
throw ZipException("Maximum number of entries for a ZIP file reached: 65535");
if (fileStr == "/")
throw ZipException("Illegal entry name /");
if (fileStr.empty())
throw ZipException("Illegal empty entry name");
if (fileStr.find(ZipCommon::ILLEGAL_PATH) != std::string::npos)
throw ZipException("Illegal entry name " + fileStr + " containing " + ZipCommon::ILLEGAL_PATH);
if (entryName.depth() > 1)
{
addDirectory(entryName.parent(), lastModifiedAt);
}
std::streamoff localHeaderOffset = _offset;
ZipCommon::CompressionMethod cm = ZipCommon::CM_STORE;
ZipCommon::CompressionLevel cl = ZipCommon::CL_NORMAL;
ZipLocalFileHeader hdr(entryName, lastModifiedAt, cm, cl);
hdr.setStartPos(localHeaderOffset);
ZipOutputStream zipOut(_out, hdr, _seekableOut);
zipOut.close();
hdr.setStartPos(localHeaderOffset); // reset again now that compressed Size is known
_offset = hdr.getEndPos();
if (hdr.searchCRCAndSizesAfterData())
_offset += ZipDataInfo::getFullHeaderSize();
_files.insert(std::make_pair(entryName.toString(Poco::Path::PATH_UNIX), hdr));
poco_assert (_out);
ZipFileInfo nfo(hdr);
nfo.setOffset(localHeaderOffset);
_infos.insert(std::make_pair(entryName.toString(Poco::Path::PATH_UNIX), nfo));
EDone.notify(this, hdr);
}
void Compress::addRecursive(const Poco::Path& entry, ZipCommon::CompressionLevel cl, bool excludeRoot, const Poco::Path& name)
{
addRecursive(entry, ZipCommon::CM_DEFLATE, cl, excludeRoot, name);
}
void Compress::addRecursive(const Poco::Path& entry, ZipCommon::CompressionMethod cm, ZipCommon::CompressionLevel cl, bool excludeRoot, const Poco::Path& name)
{
Poco::File aFile(entry);
if (!aFile.isDirectory())
throw ZipException("Not a directory: "+ entry.toString());
Poco::Path aName(name);
aName.makeDirectory();
if (!excludeRoot)
{
if (aName.depth() == 0)
{
Poco::Path tmp(entry);
tmp.makeAbsolute(); // eliminate ../
aName = Poco::Path(tmp[tmp.depth()-1]);
aName.makeDirectory();
}
addDirectory(aName, aFile.getLastModified());
}
// iterate over children
std::vector<std::string> children;
aFile.list(children);
std::vector<std::string>::const_iterator it = children.begin();
std::vector<std::string>::const_iterator itEnd = children.end();
for (; it != itEnd; ++it)
{
Poco::Path realFile(entry, *it);
Poco::Path renamedFile(aName, *it);
Poco::File aFile(realFile);
if (aFile.isDirectory())
{
realFile.makeDirectory();
renamedFile.makeDirectory();
addRecursive(realFile, cm, cl, false, renamedFile);
}
else
{
realFile.makeFile();
renamedFile.makeFile();
addFile(realFile, renamedFile, cm, cl);
}
}
}
ZipArchive Compress::close()
{
if (!_dirs.empty())
return ZipArchive(_files, _infos, _dirs);
poco_assert (_infos.size() == _files.size());
poco_assert (_files.size() < 65536);
Poco::UInt32 centralDirStart = _offset;
Poco::UInt32 centralDirSize = 0;
// write all infos
ZipArchive::FileInfos::const_iterator it = _infos.begin();
ZipArchive::FileInfos::const_iterator itEnd = _infos.end();
for (; it != itEnd; ++it)
{
const ZipFileInfo& nfo = it->second;
std::string info(nfo.createHeader());
_out.write(info.c_str(), static_cast<std::streamsize>(info.size()));
Poco::UInt32 entrySize = static_cast<Poco::UInt32>(info.size());
centralDirSize += entrySize;
_offset += entrySize;
}
poco_assert (_out);
Poco::UInt16 numEntries = static_cast<Poco::UInt16>(_infos.size());
ZipArchiveInfo central;
central.setCentralDirectorySize(centralDirSize);
central.setNumberOfEntries(numEntries);
central.setTotalNumberOfEntries(numEntries);
central.setHeaderOffset(centralDirStart);
if (!_comment.empty() && _comment.size() <= 65535)
{
central.setZipComment(_comment);
}
std::string centr(central.createHeader());
_out.write(centr.c_str(), static_cast<std::streamsize>(centr.size()));
_out.flush();
_dirs.insert(std::make_pair(0, central));
return ZipArchive(_files, _infos, _dirs);
}
} } // namespace Poco::Zip