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ImHex/lib/libimhex/source/helpers/tar.cpp

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#include <hex/helpers/tar.hpp>
#include <hex/helpers/literals.hpp>
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#include <hex/helpers/fs.hpp>
#include <hex/helpers/logger.hpp>
#include <hex/helpers/fmt.hpp>
#include <wolv/io/file.hpp>
namespace hex {
using namespace hex::literals;
Tar::Tar(const std::fs::path &path, Mode mode) {
int tar_error = MTAR_ESUCCESS;
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// Explicitly create file so a short path gets generated
if (mode == Mode::Create) {
wolv::io::File file(path, wolv::io::File::Mode::Create);
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file.flush();
}
auto shortPath = wolv::io::fs::toShortPath(path);
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if (mode == Tar::Mode::Read)
tar_error = mtar_open(&this->m_ctx, shortPath.string().c_str(), "r");
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else if (mode == Tar::Mode::Write)
tar_error = mtar_open(&this->m_ctx, shortPath.string().c_str(), "a");
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else if (mode == Tar::Mode::Create)
tar_error = mtar_open(&this->m_ctx, shortPath.string().c_str(), "w");
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else
tar_error = MTAR_EFAILURE;
this->m_path = path;
this->m_valid = (tar_error == MTAR_ESUCCESS);
if (!this->m_valid) {
this->m_tarOpenErrno = tar_error;
// hopefully this errno corresponds to the file open call in mtar_open
this->m_fileOpenErrno = errno;
}
}
Tar::~Tar() {
this->close();
}
Tar::Tar(hex::Tar &&other) noexcept {
this->m_ctx = other.m_ctx;
this->m_path = other.m_path;
this->m_valid = other.m_valid;
this->m_tarOpenErrno = other.m_tarOpenErrno;
this->m_fileOpenErrno = other.m_fileOpenErrno;
other.m_ctx = { };
other.m_valid = false;
}
Tar &Tar::operator=(Tar &&other) noexcept {
this->m_ctx = other.m_ctx;
other.m_ctx = { };
this->m_path = other.m_path;
this->m_valid = other.m_valid;
other.m_valid = false;
this->m_tarOpenErrno = other.m_tarOpenErrno;
this->m_fileOpenErrno = other.m_fileOpenErrno;
return *this;
}
std::vector<std::fs::path> Tar::listEntries(const std::fs::path &basePath) {
std::vector<std::fs::path> result;
const std::string PaxHeaderName = "@PaxHeader";
mtar_header_t header;
while (mtar_read_header(&this->m_ctx, &header) != MTAR_ENULLRECORD) {
std::fs::path path = header.name;
if (header.name != PaxHeaderName && wolv::io::fs::isSubPath(basePath, path)) {
result.emplace_back(header.name);
}
mtar_next(&this->m_ctx);
}
return result;
}
bool Tar::contains(const std::fs::path &path) {
mtar_header_t header;
return mtar_find(&this->m_ctx, path.string().c_str(), &header) == MTAR_ESUCCESS;
}
std::string Tar::getOpenErrorString(){
return hex::format("{}: {}", mtar_strerror(this->m_tarOpenErrno), std::strerror(this->m_fileOpenErrno));
}
void Tar::close() {
if (this->m_valid) {
mtar_finalize(&this->m_ctx);
mtar_close(&this->m_ctx);
}
this->m_ctx = { };
this->m_valid = false;
}
std::vector<u8> Tar::readVector(const std::fs::path &path) {
mtar_header_t header;
auto fixedPath = path.string();
#if defined(OS_WINDOWS)
std::replace(fixedPath.begin(), fixedPath.end(), '\\', '/');
#endif
int ret = mtar_find(&this->m_ctx, fixedPath.c_str(), &header);
if(ret != MTAR_ESUCCESS){
log::debug("Failed to read vector from path {} in tarred file {}: {}",
path.string(), this->m_path.string(), mtar_strerror(ret));
return {};
}
std::vector<u8> result(header.size, 0x00);
mtar_read_data(&this->m_ctx, result.data(), result.size());
return result;
}
std::string Tar::readString(const std::fs::path &path) {
auto result = this->readVector(path);
return { result.begin(), result.end() };
}
void Tar::writeVector(const std::fs::path &path, const std::vector<u8> &data) {
if (path.has_parent_path()) {
std::fs::path pathPart;
for (const auto &part : path.parent_path()) {
pathPart /= part;
auto fixedPath = pathPart.string();
#if defined(OS_WINDOWS)
std::replace(fixedPath.begin(), fixedPath.end(), '\\', '/');
#endif
mtar_write_dir_header(&this->m_ctx, fixedPath.c_str());
}
}
auto fixedPath = path.string();
#if defined(OS_WINDOWS)
std::replace(fixedPath.begin(), fixedPath.end(), '\\', '/');
#endif
mtar_write_file_header(&this->m_ctx, fixedPath.c_str(), data.size());
mtar_write_data(&this->m_ctx, data.data(), data.size());
}
void Tar::writeString(const std::fs::path &path, const std::string &data) {
this->writeVector(path, { data.begin(), data.end() });
}
static void writeFile(mtar_t *ctx, mtar_header_t *header, const std::fs::path &path) {
constexpr static u64 BufferSize = 1_MiB;
wolv::io::File outputFile(path, wolv::io::File::Mode::Create);
std::vector<u8> buffer;
for (u64 offset = 0; offset < header->size; offset += BufferSize) {
buffer.resize(std::min<u64>(BufferSize, header->size - offset));
mtar_read_data(ctx, buffer.data(), buffer.size());
outputFile.writeVector(buffer);
}
}
void Tar::extract(const std::fs::path &path, const std::fs::path &outputPath) {
mtar_header_t header;
mtar_find(&this->m_ctx, path.string().c_str(), &header);
writeFile(&this->m_ctx, &header, outputPath);
}
void Tar::extractAll(const std::fs::path &outputPath) {
mtar_header_t header;
while (mtar_read_header(&this->m_ctx, &header) != MTAR_ENULLRECORD) {
const auto filePath = std::fs::absolute(outputPath / std::fs::path(header.name));
if (filePath.filename() != "@PaxHeader") {
std::fs::create_directories(filePath.parent_path());
writeFile(&this->m_ctx, &header, filePath);
}
mtar_next(&this->m_ctx);
}
}
}