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#include "coding/zip_reader.hpp"
#include "coding/constants.hpp"
#include "base/logging.hpp"
#include "base/scope_guard.hpp"
#include <array>
#include "3party/minizip/minizip.hpp"
using namespace std;
namespace
{
class UnzipFileDelegate : public ZipFileReader::Delegate
{
public:
explicit UnzipFileDelegate(string const & path)
: m_file(make_unique<FileWriter>(path)), m_path(path), m_completed(false)
{
}
~UnzipFileDelegate() override
{
if (!m_completed)
{
m_file.reset();
FileWriter::DeleteFileX(m_path);
}
}
// ZipFileReader::Delegate overrides:
void OnBlockUnzipped(size_t size, char const * data) override { m_file->Write(data, size); }
void OnCompleted() override { m_completed = true; }
private:
unique_ptr<FileWriter> m_file;
string const m_path;
bool m_completed;
};
} // namespace
ZipFileReader::ZipFileReader(string const & container, string const & file, uint32_t logPageSize,
uint32_t logPageCount)
: FileReader(container, logPageSize, logPageCount), m_uncompressedFileSize(0)
{
auto zip = unzip::Open(container.c_str());
if (!zip)
MYTHROW(OpenZipException, ("Can't get zip file handle", container));
SCOPE_GUARD(zipGuard, bind(&unzClose, zip));
if (unzip::Code::Ok != unzip::SeekToFile(zip, file.c_str()))
MYTHROW(LocateZipException, ("Can't locate file inside zip", file));
if (unzip::Code::Ok != unzip::OpenCurrentFile(zip))
MYTHROW(LocateZipException, ("Can't open file inside zip", file));
auto const offset = unzip::GetCurrentFileFilePos(zip);
unzip::CloseCurrentFile(zip);
if (offset == 0 || offset > Size())
MYTHROW(LocateZipException, ("Invalid offset inside zip", file));
unzip::FileInfo fileInfo;
if (unzip::Code::Ok != unzip::GetCurrentFileInfo(zip, fileInfo))
MYTHROW(LocateZipException, ("Can't get compressed file size inside zip", file));
SetOffsetAndSize(offset, fileInfo.m_info.compressed_size);
m_uncompressedFileSize = fileInfo.m_info.uncompressed_size;
}
void ZipFileReader::FilesList(string const & zipContainer, FileList & filesList)
{
auto const zip = unzip::Open(zipContainer.c_str());
if (!zip)
MYTHROW(OpenZipException, ("Can't get zip file handle", zipContainer));
SCOPE_GUARD(zipGuard, bind(&unzip::Close, zip));
if (unzip::Code::Ok != unzip::SeekToFirstFile(zip))
MYTHROW(LocateZipException, ("Can't find first file inside zip", zipContainer));
do
{
unzip::FileInfo fileInfo;
if (unzip::Code::Ok != unzip::GetCurrentFileInfo(zip, fileInfo))
MYTHROW(LocateZipException, ("Can't get file name inside zip", zipContainer));
filesList.push_back(make_pair(fileInfo.m_filename, fileInfo.m_info.uncompressed_size));
} while (unzip::Code::Ok == unzip::SeekToNextFile(zip));
}
bool ZipFileReader::IsZip(string const & zipContainer)
{
auto zip = unzip::Open(zipContainer);
if (!zip)
return false;
unzip::Close(zip);
return true;
}
// static
void ZipFileReader::UnzipFile(string const & zipContainer, string const & fileInZip,
Delegate & delegate)
{
auto zip = unzip::Open(zipContainer);
if (!zip)
MYTHROW(OpenZipException, ("Can't get zip file handle", zipContainer));
SCOPE_GUARD(zipGuard, bind(&unzip::Close, zip));
if (unzip::Code::Ok != unzip::SeekToFile(zip, fileInZip))
MYTHROW(LocateZipException, ("Can't locate file inside zip", fileInZip));
if (unzip::Code::Ok != unzip::OpenCurrentFile(zip))
MYTHROW(LocateZipException, ("Can't open file inside zip", fileInZip));
SCOPE_GUARD(currentFileGuard, bind(&unzip::CloseCurrentFile, zip));
unzip::FileInfo fileInfo;
if (unzip::Code::Ok != unzip::GetCurrentFileInfo(zip, fileInfo))
MYTHROW(LocateZipException, ("Can't get uncompressed file size inside zip", fileInZip));
std::array<char, unzip::kFileBufferSize> buf;
int readBytes = 0;
delegate.OnStarted();
do
{
readBytes = unzip::ReadCurrentFile(zip, buf);
if (readBytes < 0)
{
MYTHROW(InvalidZipException,
("Error", readBytes, "while unzipping", fileInZip, "from", zipContainer));
}
delegate.OnBlockUnzipped(static_cast<size_t>(readBytes), buf.data());
} while (readBytes != 0);
delegate.OnCompleted();
}
// static
void ZipFileReader::UnzipFile(string const & zipContainer, string const & fileInZip,
string const & outPath)
{
UnzipFileDelegate delegate(outPath);
UnzipFile(zipContainer, fileInZip, delegate);
}
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