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	diff --git a/CMakeLists.txt b/CMakeLists.txt
	index eee7061..e148fbc 100644
	--- a/CMakeLists.txt
	+++ b/CMakeLists.txt
	@@ -1,378 +1,377 @@
	cmake_minimum_required(VERSION 3.2)

	project(Guitar
	VERSION 0.9.0
	LANGUAGES CXX C
	)

	set(CMAKE_INCLUDE_CURRENT_DIR ON)
	set(CMAKE_AUTOMOC ON)
	set(CMAKE_AUTOUIC ON)
	set(CMAKE_AUTORCC ON)

	list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake/modules/")

	find_package(Qt5 COMPONENTS Core Widgets Network Svg REQUIRED)
	find_package(zlib REQUIRED )
	find_package(OpenSSL REQUIRED )
	find_package(Qt5LinguistTools REQUIRED)
	if(WIN32)
	# check package at
	# https://github.com/rprichard/winpty
	find_package(winpty REQUIRED )
	endif()

	# extract version information
	string(TIMESTAMP Guitar_copyright_year "%Y")
	execute_process(
	COMMAND git rev-parse --short=7 HEAD
	WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
	OUTPUT_VARIABLE Guitar_git_hash
	OUTPUT_STRIP_TRAILING_WHITESPACE
	)

	configure_file(version.h.in version.h)
	configure_file(win.rc.in win.rc.h)
	configure_file(Info.plist.in Info.plist)

	set(Guitar_SOURCES
	src/main.cpp
	src/MainWindow.cpp
	src/Git.cpp
	src/common/joinpath.cpp
	src/common/misc.cpp
	src/ConfigCredentialHelperDialog.cpp
	src/MySettings.cpp
	src/FileDiffWidget.cpp
	src/TextEditDialog.cpp
	src/LogTableWidget.cpp
	src/FileDiffSliderWidget.cpp
	src/FileUtil.cpp
	src/SettingsDialog.cpp
	src/MergeBranchDialog.cpp
	src/CloneDialog.cpp
	src/AboutDialog.cpp
	src/RepositoryInfoFrame.cpp
	src/RepositoryPropertyDialog.cpp
	src/RepositoryData.cpp
	src/MyToolButton.cpp
	src/GitDiff.cpp
	src/CommitPropertyDialog.cpp
	src/Terminal.cpp
	src/DeleteTagsDialog.cpp
	src/RepositoriesTreeWidget.cpp
	src/SelectCommandDialog.cpp
	src/ImageViewWidget.cpp
	src/FileHistoryWindow.cpp
	src/GitPackIdxV2.cpp
	src/GitPack.cpp
	src/GitObjectManager.cpp
	src/FilePropertyDialog.cpp
	src/BigDiffWindow.cpp
	src/MaximizeButton.cpp
	src/CommitExploreWindow.cpp
	src/ReadOnlyLineEdit.cpp
	src/ReadOnlyPlainTextEdit.cpp
	src/MyTableWidgetDelegate.cpp
	src/SetRemoteUrlDialog.cpp
	src/ClearButton.cpp
	src/SetUserDialog.cpp
	src/SearchFromGitHubDialog.cpp
	src/webclient.cpp
	src/charvec.cpp
	src/urlencode.cpp
	src/HyperLinkLabel.cpp
	src/JumpDialog.cpp
	src/CheckoutDialog.cpp
	src/DeleteBranchDialog.cpp
	src/BasicRepositoryDialog.cpp
	src/RemoteRepositoriesTableWidget.cpp
	src/LocalSocketReader.cpp
	src/PushDialog.cpp
	src/StatusLabel.cpp
	src/RepositoryLineEdit.cpp
	src/DirectoryLineEdit.cpp
	src/AbstractSettingForm.cpp
	src/SettingExampleForm.cpp
	src/CreateRepositoryDialog.cpp
	src/GitHubAPI.cpp
	src/MemoryReader.cpp
	src/ExperimentDialog.cpp
	src/gunzip.cpp
	src/AvatarLoader.cpp
	src/SettingNetworkForm.cpp
	src/Photoshop.cpp
	src/SettingBehaviorForm.cpp
	src/MyProcess.cpp
	src/FileViewWidget.cpp
	src/MyTextEditorWidget.cpp
	src/AbstractProcess.cpp
	src/texteditor/AbstractCharacterBasedApplication.cpp
	src/texteditor/InputMethodPopup.cpp
	src/texteditor/TextEditorTheme.cpp
	src/texteditor/TextEditorWidget.cpp
	src/texteditor/unicode.cpp
	src/texteditor/UnicodeWidth.cpp
	src/MyImageViewWidget.cpp
	src/SetGlobalUserDialog.cpp
	src/ReflogWindow.cpp
	src/Theme.cpp
	src/ApplicationGlobal.cpp
	src/BlameWindow.cpp
	src/MenuButton.cpp
	src/SettingGeneralForm.cpp
	src/WelcomeWizardDialog.cpp
	src/DialogHeaderFrame.cpp
	src/CommitViewWindow.cpp
	src/EditRemoteDialog.cpp
	src/gpg.cpp
	src/SelectGpgKeyDialog.cpp
	src/SetGpgSigningDialog.cpp
	src/CommitDialog.cpp
	src/ConfigSigningDialog.cpp
	src/AreYouSureYouWantToContinueConnectingDialog.cpp
	src/LineEditDialog.cpp
	src/SettingProgramsForm.cpp
	src/InputNewTagDialog.cpp
	src/EditTagsDialog.cpp
	src/darktheme/DarkStyle.cpp
	src/darktheme/NinePatch.cpp
	src/darktheme/StandardStyle.cpp
	src/darktheme/TraditionalWindowsStyleTreeControl.cpp
	src/EditGitIgnoreDialog.cpp
	src/SelectItemDialog.cpp
	src/RebaseOntoDialog.cpp
	)


	set(Guitar_HEADERS
	src/MainWindow.h
	src/Git.h
	src/common/joinpath.h
	src/common/misc.h
	src/ConfigCredentialHelperDialog.h
	src/MySettings.h
	src/main.h
	src/FileDiffWidget.h
	src/TextEditDialog.h
	src/LogTableWidget.h
	src/FileDiffSliderWidget.h
	src/FileUtil.h
	src/SettingsDialog.h
	src/MergeBranchDialog.h
	src/CloneDialog.h
	src/AboutDialog.h
	src/RepositoryInfoFrame.h
	src/RepositoryPropertyDialog.h
	src/RepositoryData.h
	src/MyToolButton.h
	src/GitDiff.h
	src/CommitPropertyDialog.h
	src/Terminal.h
	src/DeleteTagsDialog.h
	src/RepositoriesTreeWidget.h
	src/SelectCommandDialog.h
	src/ImageViewWidget.h
	src/FileHistoryWindow.h
	src/Debug.h
	src/GitPackIdxV2.h
	src/GitPack.h
	src/GitObjectManager.h
	src/FilePropertyDialog.h
	src/BigDiffWindow.h
	src/MaximizeButton.h
	src/CommitExploreWindow.h
	src/ReadOnlyLineEdit.h
	src/ReadOnlyPlainTextEdit.h
	src/MyTableWidgetDelegate.h
	src/SetRemoteUrlDialog.h
	- myzlib.h
	src/ClearButton.h
	src/SetUserDialog.h
	src/SearchFromGitHubDialog.h
	src/webclient.h
	src/charvec.h
	src/urlencode.h
	src/HyperLinkLabel.h
	src/JumpDialog.h
	src/CheckoutDialog.h
	src/DeleteBranchDialog.h
	src/BasicRepositoryDialog.h
	src/RemoteRepositoriesTableWidget.h
	src/LocalSocketReader.h
	src/PushDialog.h
	src/StatusLabel.h
	src/RepositoryLineEdit.h
	src/DirectoryLineEdit.h
	src/AbstractSettingForm.h
	src/SettingExampleForm.h
	src/CreateRepositoryDialog.h
	src/GitHubAPI.h
	src/MemoryReader.h
	src/ExperimentDialog.h
	src/gunzip.h
	src/AvatarLoader.h
	src/SettingNetworkForm.h
	src/Photoshop.h
	src/SettingBehaviorForm.h
	src/MyProcess.h
	src/FileViewWidget.h
	src/MyTextEditorWidget.h
	src/AbstractProcess.h
	src/texteditor/AbstractCharacterBasedApplication.h
	src/texteditor/InputMethodPopup.h
	src/texteditor/TextEditorTheme.h
	src/texteditor/TextEditorWidget.h
	src/texteditor/unicode.h
	src/texteditor/UnicodeWidth.h
	src/MyImageViewWidget.h
	src/SetGlobalUserDialog.h
	src/ReflogWindow.h
	src/Theme.h
	src/ApplicationGlobal.h
	src/BlameWindow.h
	src/MenuButton.h
	src/SettingGeneralForm.h
	src/WelcomeWizardDialog.h
	src/DialogHeaderFrame.h
	src/CommitViewWindow.h
	src/EditRemoteDialog.h
	src/gpg.h
	src/SelectGpgKeyDialog.h
	src/SetGpgSigningDialog.h
	src/CommitDialog.h
	src/ConfigSigningDialog.h
	src/AreYouSureYouWantToContinueConnectingDialog.h
	src/LineEditDialog.h
	src/SettingProgramsForm.h
	src/InputNewTagDialog.h
	src/EditTagsDialog.h
	src/darktheme/DarkStyle.h
	src/darktheme/NinePatch.h
	src/darktheme/StandardStyle.h
	src/darktheme/TraditionalWindowsStyleTreeControl.h
	src/EditGitIgnoreDialog.h
	src/SelectItemDialog.h
	src/RebaseOntoDialog.h
	)

	if(UNIX)
	list(APPEND Guitar_SOURCES
	src/unix/UnixProcess.cpp
	src/unix/UnixPtyProcess.cpp
	)
	list(APPEND Guitar_HEADERS
	src/unix/UnixProcess.h
	src/unix/UnixPtyProcess.h
	)
	elseif(WIN32)
	list(APPEND Guitar_SOURCES
	src/win32/thread.cpp
	src/win32/event.cpp
	src/win32/win32.cpp
	src/win32/Win32Process.cpp
	src/win32/Win32PtyProcess.cpp
	)
	list(APPEND Guitar_HEADERS
	src/win32/thread.h
	src/win32/event.h
	src/win32/mutex.h
	src/win32/win32.h
	src/win32/Win32Process.h
	src/win32/Win32PtyProcess.h
	)
	endif()

	set(Guitar_UIS
	src/MainWindow.ui
	src/ConfigCredentialHelperDialog.ui
	src/TextEditDialog.ui
	src/SettingsDialog.ui
	src/MergeBranchDialog.ui
	src/CloneDialog.ui
	src/AboutDialog.ui
	src/RepositoryPropertyDialog.ui
	src/CommitPropertyDialog.ui
	src/DeleteTagsDialog.ui
	src/SelectCommandDialog.ui
	src/FileDiffWidget.ui
	src/FileHistoryWindow.ui
	src/FilePropertyDialog.ui
	src/BigDiffWindow.ui
	src/CommitExploreWindow.ui
	src/SetRemoteUrlDialog.ui
	src/SetUserDialog.ui
	src/SearchFromGitHubDialog.ui
	src/JumpDialog.ui
	src/CheckoutDialog.ui
	src/DeleteBranchDialog.ui
	src/PushDialog.ui
	src/SettingExampleForm.ui
	src/CreateRepositoryDialog.ui
	src/ExperimentDialog.ui
	src/SettingNetworkForm.ui
	src/SettingBehaviorForm.ui
	src/SetGlobalUserDialog.ui
	src/ReflogWindow.ui
	src/BlameWindow.ui
	src/SettingGeneralForm.ui
	src/WelcomeWizardDialog.ui
	src/CommitViewWindow.ui
	src/EditRemoteDialog.ui
	src/SelectGpgKeyDialog.ui
	src/SetGpgSigningDialog.ui
	src/CommitDialog.ui
	src/ConfigSigningDialog.ui
	src/AreYouSureYouWantToContinueConnectingDialog.ui
	src/LineEditDialog.ui
	src/SettingProgramsForm.ui
	src/InputNewTagDialog.ui
	src/EditTagsDialog.ui
	src/EditGitIgnoreDialog.ui
	src/SelectItemDialog.ui
	src/RebaseOntoDialog.ui
	)

	set(Guitar_RESOURCES
	src/resources/resources.qrc
	)

	set(Guitar_TRANSLATIONS
	src/resources/translations/ja_JPN.ts
	)

	qt5_add_translation(Guitar_QM_FILES ${Guitar_TRANSLATIONS})
	configure_file(${Guitar_RESOURCES} ${CMAKE_BINARY_DIR} COPYONLY)

	add_custom_target(translations ALL DEPENDS ${Guitar_QM_FILES})

	add_custom_target(resources ALL DEPENDS ${Guitar_RESOURCES})

	add_dependencies(resources translations)

	include_directories(src)
	include_directories(src/texteditor)

	add_executable(${PROJECT_NAME}
	${Guitar_SOURCES}
	${Guitar_HEADERS}
	${Guitar_UIS}
	${Guitar_RESOURCES}
	${Guitar_QM_FILES}
	)

	set_target_properties(${PROJECT_NAME} PROPERTIES
	CXX_STANDARD 11
	CXX_EXTENSIONS OFF
	)

	target_link_libraries(${PROJECT_NAME}
	Qt5::Widgets
	Qt5::Network
	Qt5::Svg
	zlib
	OpenSSL::SSL OpenSSL::Crypto
	)


	add_subdirectory(extra)
	diff --git a/myzlib.h b/myzlib.h
	deleted file mode 100644
	index 213d57e..0000000
	--- a/myzlib.h
	+++ /dev/null
	@@ -1,6 +0,0 @@
	-#ifdef __HAIKU__
	-#include <zlib.h>
	-#else
	-#include "../zlib/zlib.h"
	-#endif
	-//#include <QtZlib/zlib.h>
	diff --git a/src/GitPack.cpp b/src/GitPack.cpp
	index 74c1306..8819f28 100644
	--- a/src/GitPack.cpp
	+++ b/src/GitPack.cpp
	@@ -1,252 +1,252 @@
	#include "GitPack.h"
	-#include "../myzlib.h"
	+#include <zlib.h>
	#include <QDebug>
	#include <QFile>
	#include "GitPackIdxV2.h"

	void GitPack::decodeTree(QByteArray *out)
	{
	if (out && out->size() > 0) {
	QByteArray ba;
	uint8_t const begin = (uint8_t const )out->data();
	uint8_t const *end = begin + out->size();
	uint8_t const *ptr = begin;
	while (ptr < end) {
	int mode = 0;
	while (ptr < end) {
	int c = *ptr & 0xff;
	ptr++;
	if (isdigit(c & 0xff)) {
	mode = mode * 10 + (c - '0');
	} else if (c == ' ') {
	break;
	}
	}
	uint8_t const *left = ptr;
	while (ptr < end && *ptr) {
	ptr++;
	}
	std::string name(left, ptr);
	if (ptr + 20 < end) {
	ptr++;
	char tmp[100];
	sprintf(tmp, "%06u %s ", mode, mode < 100000 ? "tree" : "blob");
	char *p = tmp + 12;
	for (int i = 0; i < 20; i++) {
	sprintf(p, "%02x", ptr[i]);
	p += 2;
	}
	ba.append(tmp, p - tmp);
	ba.append('\t');
	ba.append(name.c_str(), name.size());
	ba.append('\n');
	ptr += 20;
	} else {
	break;
	}
	}
	*out = std::move(ba);
	}

	}

	Git::Object::Type GitPack::stripHeader(QByteArray *out)
	{
	if (out) {
	int n = out->size();
	if (n > 0) {
	char const *p = out->data();
	if (n > 16) n = 16;
	for (int i = 0; i < n; i++) {
	if (p[i] == 0) {
	Git::Object::Type type = Git::Object::Type::UNKNOWN;
	if (strncmp(p, "blob ", 5) == 0) {
	type = Git::Object::Type::BLOB;
	} else if (strncmp(p, "tree ", 5) == 0) {
	type = Git::Object::Type::TREE;
	} else if (strncmp(p, "commit ", 7) == 0) {
	type = Git::Object::Type::COMMIT;
	} else if (strncmp(p, "tag ", 4) == 0) {
	type = Git::Object::Type::TAG;
	}
	if (type != Git::Object::Type::UNKNOWN) {
	*out = out->mid(i + 1);
	}
	return type;
	}
	}
	}
	}
	return Git::Object::Type::UNKNOWN;
	}

	bool GitPack::decompress(QIODevice in, size_t expanded_size, QByteArray out, size_t consumed, uint32_t crc)
	{
	if (consumed) *consumed = 0;
	try {
	int err;
	z_stream d_stream;

	d_stream.zalloc = (alloc_func)0;
	d_stream.zfree = (free_func)0;
	d_stream.opaque = (voidpf)0;

	d_stream.next_in = 0;
	d_stream.avail_in = 0;

	err = inflateInit(&d_stream);

	if (err != Z_OK) {
	throw QString("failed: inflateInit");
	}

	while (1) {
	if (expanded_size > 0 && (size_t)out->size() > expanded_size) {
	throw QString("file too large");
	}
	uint8_t src[1024];
	uint8_t tmp[65536];
	if (d_stream.next_in != src && d_stream.avail_in > 0) {
	memmove(src, d_stream.next_in, d_stream.avail_in);
	}
	d_stream.next_in = src;
	if (d_stream.avail_in < sizeof(src)) {
	int n = sizeof(src) - d_stream.avail_in;
	n = in->read((char *)(src + d_stream.avail_in), n);
	if (n >= 0) {
	d_stream.avail_in += n;
	}
	}

	d_stream.next_out = tmp;
	size_t l = expanded_size - out->size();
	if (l > sizeof(tmp)) l = sizeof(tmp);
	d_stream.avail_out = l;
	uLong total = d_stream.total_out;

	err = ::inflate(&d_stream, Z_NO_FLUSH);

	int in_len = (uint8_t *)d_stream.next_in - src;
	if (consumed) *consumed += in_len;

	if (crc) crc = crc32(crc, src, in_len);

	int out_len = d_stream.total_out - total;
	out->append((char const *)tmp, out_len);

	if (err == Z_STREAM_END) {
	break;
	}
	if (err != Z_OK) {
	throw QString("failed: inflate");
	}
	}

	err = inflateEnd(&d_stream);
	if (err != Z_OK) {
	throw QString("failed: inflateEnd");
	}

	return true;
	} catch (QString const &e) {
	qDebug() << e;
	}
	return false;
	}

	bool GitPack::seekPackedObject(QIODevice file, const GitPackIdxItem item, Info *out)
	{
	try {
	Info info;

	auto Read = [&](void *ptr, size_t len){
	const auto l = file->read((char *)ptr, len);
	if (l < 0 \|\| ((size_t)(l)) != len) {
	throw QString("failed to read");
	}
	info.checksum = crc32(info.checksum, (uint8_t const *)ptr, len);
	};

	file->seek(0);

	uint32_t header[3];
	Read(header, sizeof(int32_t) * 3);
	if (memcmp(header, "PACK", 4) != 0) throw QString("invalid pack file");
	uint32_t version = read_uint32_be(header + 1);
	if (version < 2) throw QString("invalid pack file version");
	/int count = /read_uint32_be(header + 2);

	file->seek(item->offset);

	info.checksum = 0;

	// cf. https://github.com/github/git-msysgit/blob/master/builtin/unpack-objects.c
	{
	size_t size = 0;
	char c;
	Read(&c, 1);
	info.type = (Git::Object::Type)((c >> 4) & 7);
	size = c & 0x0f;
	int shift = 4;
	while (c & 0x80) {
	Read(&c, 1);
	size \|= (c & 0x7f) << shift;
	shift += 7;
	}
	info.expanded_size = size;
	}
	if (info.type == Git::Object::Type::OFS_DELTA) {
	uint64_t offset = 0;
	char c;
	Read(&c, 1);
	offset = c & 0x7f;
	while (c & 0x80) {
	Read(&c, 1);
	offset = ((offset + 1) << 7) \| (c & 0x7f);
	}
	info.offset = offset;
	} else if (info.type == Git::Object::Type::REF_DELTA) {
	char bin[20];
	Read(bin, 20);
	char tmp[41];
	for (int i = 0; i < 20; i++) {
	sprintf(tmp + i * 2, "%02x", bin[i] & 0xff);
	}
	info.ref_id = QString::fromLatin1(tmp, GIT_ID_LENGTH);
	}

	*out = info;
	return true;
	} catch (QString const &e) {
	qDebug() << e;
	}
	return false;
	}

	bool GitPack::load(QIODevice file, const GitPackIdxItem item, Object *out)
	{
	*out = Object();
	try {
	seekPackedObject(file, item, out);

	if (decompress(file, out->expanded_size, &out->content, &out->packed_size, &out->checksum)) {
	out->expanded_size = out->expanded_size;
	return true;
	}
	} catch (QString const &e) {
	qDebug() << e;
	}
	return false;
	}

	bool GitPack::load(QString const &packfile, const GitPackIdxItem item, GitPack::Object out)
	{
	QFile file(packfile);
	if (file.open(QFile::ReadOnly)) {
	if (load(&file, item, out)) {
	return true;
	}
	}
	return false;
	}

	diff --git a/src/gunzip.cpp b/src/gunzip.cpp
	index 3ffb774..b98156d 100644
	--- a/src/gunzip.cpp
	+++ b/src/gunzip.cpp
	@@ -1,228 +1,228 @@
	#include "gunzip.h"
	-#include "myzlib.h"
	+#include <zlib.h>
	#include <stdint.h>
	#include <QFile>

	void gunzip::set_header_only(bool f)
	{
	header_only = f;
	}

	void gunzip::set_maximul_size(int64_t size)
	{
	maxsize = size;
	}

	bool gunzip::decode(QIODevice input, QIODevice output)
	{
	error = QString();
	try {
	struct Header {
	uint8_t id1;
	uint8_t id2;
	uint8_t cm;
	uint8_t flg;
	uint8_t mtime[4];
	uint8_t xfl;
	uint8_t os;
	};
	enum {
	FTEXT = 0x01,
	FHCRC = 0x02,
	FEXTRA = 0x04,
	FNAME = 0x08,
	FCOMMENT = 0x10,
	};

	unsigned char ibuf[4096];
	bool ok = true;
	int n;

	n = input->read((char *)ibuf, sizeof(Header));
	if (n != 10) {
	throw QString("failed to read the header");
	}

	Header h = (Header )ibuf;

	if (h->id1 == 0x1f && h->id2 == 0x8b && h->cm == 8) {
	// ok
	if (header_only) {
	return true;
	}
	} else {
	throw QString("invalid input format");
	}

	auto ReadText = [&](){
	char c;
	std::vector<uint8_t> vec;
	while (1) {
	if (input->read(&c, 1) != 1) {
	break;
	}
	if (c == 0) break;
	vec.push_back((uint8_t)c);
	}
	std::string str;
	if (!vec.empty()) {
	str.assign((char const *)&vec[0], vec.size());
	}
	return str;
	};

	if (h->flg & FEXTRA) {
	n = input->read((char *)ibuf, 2);
	n = ((uint8_t)ibuf[1] << 8) \| (uint8_t)ibuf[0];
	input->seek(input->pos() + n);
	}
	if (h->flg & FNAME) {
	std::string name = ReadText();
	(void)name;
	}
	if (h->flg & FCOMMENT) {
	std::string comment = ReadText();
	(void)comment;
	}
	if (h->flg & FHCRC) {
	input->read((char *)ibuf, 2);
	}

	z_stream stream;
	uint32_t crc = 0;
	int err;

	stream.zalloc = (alloc_func)0;
	stream.zfree = (free_func)0;
	stream.opaque = (voidpf)0;

	stream.next_in = ibuf;
	stream.avail_in = 0;

	err = inflateInit2(&stream, -MAX_WBITS);

	if (err != Z_OK) {
	throw QString("inflateInit2 faled");
	}

	if (open) {
	if (!open(output)) {
	ok = false;
	}
	} else {
	if (!output->open(QIODevice::WriteOnly)) {
	ok = false;
	}
	}
	if (!ok) throw QString("failed to open the output device");

	int64_t inpos = input->pos();

	auto Close = [&](){
	if (close) {
	close(output);
	} else {
	output->close();
	}
	inflateEnd(&stream);
	};

	try {
	while (1) {
	if (stream.avail_in == 0) {
	stream.next_in = ibuf;
	}
	if (stream.avail_in < sizeof(ibuf)) {
	stream.next_in = ibuf + stream.avail_in;
	auto len = input->read((char *)stream.next_in, sizeof(ibuf) - stream.avail_in);
	stream.avail_in += len;
	}
	unsigned char obuf[65536];
	stream.next_out = obuf; /* discard the output */
	stream.avail_out = sizeof(obuf);
	if (maxsize != -1 && stream.total_out + stream.avail_out > (unsigned)maxsize && (unsigned)maxsize >= stream.total_out) {
	stream.avail_out = maxsize - stream.total_out;
	}
	uLong total_out = stream.total_out;
	err = ::inflate(&stream, Z_NO_FLUSH);
	int n = stream.total_out - total_out;

	if (write) {
	if (!write(output, (char const *)obuf, n)) {
	ok = false;
	}
	} else {
	int w = output->write((char const *)obuf, n);
	if (w != n) {
	ok = false;
	}
	}
	if (!ok) throw QString("failed to write to the output device");

	crc = crc32(crc, (unsigned char const *)obuf, n);
	if (err == Z_STREAM_END) {
	break;
	}
	if (err != Z_OK) {
	throw QString("inflate failed");
	}
	if (stream.total_out >= (unsigned)maxsize) {
	break;
	}
	}
	} catch (...) {
	Close();
	throw;
	}
	Close();

	input->seek(inpos + stream.total_in);
	n = input->read((char *)ibuf, 8);

	auto ReadU32LE = [](void const *p)->uint32_t{
	uint8_t const q = (uint8_t const )p;
	return (q[3] << 24) \| (q[2] << 16) \| (q[1] << 8) \| q[0];
	};

	auto c = ReadU32LE(ibuf);
	auto l = ReadU32LE(ibuf + 4);
	if (c != crc) throw QString("crc incorrect");
	if (l != stream.total_out) throw QString("length incorrect");

	return true;
	} catch (QString const &e) {
	error = e;
	}
	return false;
	}

	bool gunzip::decode(const QString &inpath, const QString &outpath)
	{
	QFile infile(inpath);
	QFile outfile(outpath);
	if (infile.open(QFile::ReadOnly)) {
	if (decode(&infile, &outfile)) {
	return true;
	}
	}
	return false;
	}

	bool gunzip::is_valid_gz_file(QIODevice *input)
	{
	gunzip z;
	z.set_header_only(true);
	return z.decode(input, nullptr);
	}

	bool gunzip::is_valid_gz_file(const QString &inpath)
	{
	QFile infile(inpath);
	if (infile.open(QFile::ReadOnly)) {
	gunzip z;
	if (z.is_valid_gz_file(&infile)) {
	return true;
	}
	}
	return false;
	}

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