xlnt/source/zip_file.cpp

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#include <array>
#include <fstream>
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#include "common/zip_file.hpp"
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namespace xlnt {
zip_file::zip_file(const std::string &filename, file_mode mode, file_access access)
: zip_file_(nullptr),
unzip_file_(nullptr),
current_state_(state::closed),
filename_(filename),
modified_(false),
// mode_(mode),
access_(access)
{
switch(mode)
{
case file_mode::open:
read_all();
break;
case file_mode::open_or_create:
if(file_exists(filename))
{
read_all();
}
else
{
flush(true);
}
break;
case file_mode::create:
flush(true);
break;
case file_mode::create_new:
if(file_exists(filename))
{
throw std::runtime_error("file exists");
}
flush(true);
break;
case file_mode::truncate:
if((int)access & (int)file_access::read)
{
throw std::runtime_error("cannot read from file opened with file_mode truncate");
}
flush(true);
break;
case file_mode::append:
read_all();
break;
}
}
zip_file::~zip_file()
{
change_state(state::closed);
}
std::string zip_file::get_file_contents(const std::string &filename)
{
return files_[filename];
}
void zip_file::set_file_contents(const std::string &filename, const std::string &contents)
{
if(!has_file(filename) || files_[filename] != contents)
{
modified_ = true;
}
files_[filename] = contents;
}
void zip_file::delete_file(const std::string &filename)
{
files_.erase(filename);
}
bool zip_file::has_file(const std::string &filename)
{
return files_.find(filename) != files_.end();
}
void zip_file::flush(bool force_write)
{
if(modified_ || force_write)
{
write_all();
}
}
void zip_file::read_all()
{
if(!((int)access_ & (int)file_access::read))
{
throw std::runtime_error("don't have read access");
}
change_state(state::read);
int result = unzGoToFirstFile(unzip_file_);
std::array<char, 1000> file_name_buffer = {{'\0'}};
std::vector<char> file_buffer;
while(result == UNZ_OK)
{
unz_file_info file_info;
file_name_buffer.fill('\0');
result = unzGetCurrentFileInfo(unzip_file_, &file_info, file_name_buffer.data(),
static_cast<uLong>(file_name_buffer.size()), nullptr, 0, nullptr, 0);
if(result != UNZ_OK)
{
throw result;
}
result = unzOpenCurrentFile(unzip_file_);
if(result != UNZ_OK)
{
throw result;
}
if(file_buffer.size() < file_info.uncompressed_size + 1)
{
file_buffer.resize(file_info.uncompressed_size + 1);
}
file_buffer[file_info.uncompressed_size] = '\0';
result = unzReadCurrentFile(unzip_file_, file_buffer.data(), file_info.uncompressed_size);
if(result != static_cast<int>(file_info.uncompressed_size))
{
throw result;
}
std::string current_filename(file_name_buffer.begin(), file_name_buffer.begin() + file_info.size_filename);
std::string contents(file_buffer.begin(), file_buffer.begin() + file_info.uncompressed_size);
if(current_filename.back() != '/')
{
files_[current_filename] = contents;
}
else
{
directories_.push_back(current_filename);
}
result = unzCloseCurrentFile(unzip_file_);
if(result != UNZ_OK)
{
throw result;
}
result = unzGoToNextFile(unzip_file_);
}
}
void zip_file::write_all()
{
if(!((int)access_ & (int)file_access::write))
{
throw std::runtime_error("don't have write access");
}
change_state(state::write, false);
for(auto file : files_)
{
write_to_zip(file.first, file.second, true);
}
modified_ = false;
}
std::string zip_file::read_from_zip(const std::string &filename)
{
if(!((int)access_ & (int)file_access::read))
{
throw std::runtime_error("don't have read access");
}
change_state(state::read);
auto result = unzLocateFile(unzip_file_, filename.c_str(), 1);
if(result != UNZ_OK)
{
throw result;
}
result = unzOpenCurrentFile(unzip_file_);
if(result != UNZ_OK)
{
throw result;
}
unz_file_info file_info;
std::array<char, 1000> file_name_buffer;
std::array<char, 1000> extra_field_buffer;
std::array<char, 1000> comment_buffer;
unzGetCurrentFileInfo(unzip_file_, &file_info,
file_name_buffer.data(), static_cast<uLong>(file_name_buffer.size()),
extra_field_buffer.data(), static_cast<uLong>(extra_field_buffer.size()),
comment_buffer.data(), static_cast<uLong>(comment_buffer.size()));
std::vector<char> file_buffer(file_info.uncompressed_size + 1, '\0');
result = unzReadCurrentFile(unzip_file_, file_buffer.data(), file_info.uncompressed_size);
if(result != static_cast<int>(file_info.uncompressed_size))
{
throw result;
}
result = unzCloseCurrentFile(unzip_file_);
if(result != UNZ_OK)
{
throw result;
}
return std::string(file_buffer.begin(), file_buffer.end());
}
void zip_file::write_to_zip(const std::string &filename, const std::string &content, bool append)
{
if(!((int)access_ & (int)file_access::write))
{
throw std::runtime_error("don't have write access");
}
change_state(state::write, append);
zip_fileinfo file_info;
int result = zipOpenNewFileInZip(zip_file_, filename.c_str(), &file_info, nullptr, 0, nullptr, 0, nullptr, Z_DEFLATED, Z_DEFAULT_COMPRESSION);
if(result != UNZ_OK)
{
throw result;
}
result = zipWriteInFileInZip(zip_file_, content.data(), static_cast<int>(content.size()));
if(result != UNZ_OK)
{
throw result;
}
result = zipCloseFileInZip(zip_file_);
if(result != UNZ_OK)
{
throw result;
}
}
void zip_file::change_state(state new_state, bool append)
{
if(new_state == current_state_ && append)
{
return;
}
switch(new_state)
{
case state::closed:
if(current_state_ == state::write)
{
stop_write();
}
else if(current_state_ == state::read)
{
stop_read();
}
break;
case state::read:
if(current_state_ == state::write)
{
stop_write();
}
start_read();
break;
case state::write:
if(current_state_ == state::read)
{
stop_read();
}
if(current_state_ != state::write)
{
start_write(append);
}
break;
default:
throw std::runtime_error("bad enum");
}
current_state_ = new_state;
}
bool zip_file::file_exists(const std::string& name)
{
std::ifstream f(name.c_str());
return f.good();
}
void zip_file::start_read()
{
if(unzip_file_ != nullptr || zip_file_ != nullptr)
{
throw std::runtime_error("bad state");
}
unzip_file_ = unzOpen(filename_.c_str());
if(unzip_file_ == nullptr)
{
throw std::runtime_error("bad or non-existant file");
}
}
void zip_file::stop_read()
{
if(unzip_file_ == nullptr)
{
throw std::runtime_error("bad state");
}
int result = unzClose(unzip_file_);
if(result != UNZ_OK)
{
throw result;
}
unzip_file_ = nullptr;
}
void zip_file::start_write(bool append)
{
if(unzip_file_ != nullptr || zip_file_ != nullptr)
{
throw std::runtime_error("bad state");
}
int append_status;
if(append)
{
if(!file_exists(filename_))
{
throw std::runtime_error("can't append to non-existent file");
}
append_status = APPEND_STATUS_ADDINZIP;
}
else
{
append_status = APPEND_STATUS_CREATE;
}
zip_file_ = zipOpen(filename_.c_str(), append_status);
if(zip_file_ == nullptr)
{
if(append)
{
throw std::runtime_error("couldn't append to zip file");
}
else
{
throw std::runtime_error("couldn't create zip file");
}
}
}
void zip_file::stop_write()
{
if(zip_file_ == nullptr)
{
throw std::runtime_error("bad state");
}
flush();
int result = zipClose(zip_file_, nullptr);
if(result != UNZ_OK)
{
throw result;
}
zip_file_ = nullptr;
}
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}