Add support for gzip-ed animated stickers.

Telegram/SourceFiles/base/zlib_help.h

@@ -12,6 +12,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 #include "zip.h"
 #include "unzip.h"
+#include "logs.h"
 
 #ifdef small
 #undef small

Telegram/SourceFiles/data/data_document.cpp

@@ -554,7 +554,8 @@ void DocumentData::setattributes(
 
 void DocumentData::validateLottieSticker() {
 	if (type == FileDocument
-		&& (_filename == qstr("animation.json")
+		&& (_filename.endsWith(qstr(".tgs"))
+			|| _filename == qstr("animation.json")
 			|| ((_filename.size() == 9 || _filename.size() == 10)
 				&& _filename.endsWith(qstr(".json"))
 				&& QRegularExpression("^\\d+\\.json$").match(_filename).hasMatch()))) {

Telegram/SourceFiles/history/media/history_media_sticker.cpp

@@ -123,7 +123,9 @@ void HistorySticker::unloadLottie() {
 }
 
 void HistorySticker::draw(Painter &p, const QRect &r, TextSelection selection, crl::time ms) const {
-	if (!_lottie && _data->filename().endsWith(qstr(".json"))) {
+	if (!_lottie
+		&& (_data->filename().endsWith(qstr(".tgs"))
+			|| _data->filename().endsWith(qstr(".json")))) {
 		if (_data->loaded()) {
 			const_cast<HistorySticker*>(this)->setupLottie();
 		} else {

Telegram/SourceFiles/lottie/lottie_animation.cpp

@@ -11,6 +11,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "rasterrenderer/rasterrenderer.h"
 #include "json.h"
 #include "base/algorithm.h"
+#include "zlib.h"
 #include "logs.h"
 
 #include <QFile>
@@ -18,16 +19,54 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include <crl/crl_on_main.h>
 
 namespace Lottie {
+namespace {
+
+constexpr auto kMaxSize = 1024 * 1024;
+
+QByteArray UnpackGzip(const QByteArray &bytes) {
+	z_stream stream;
+	stream.zalloc = nullptr;
+	stream.zfree = nullptr;
+	stream.opaque = nullptr;
+	stream.avail_in = 0;
+	stream.next_in = nullptr;
+	int res = inflateInit2(&stream, 16 + MAX_WBITS);
+	if (res != Z_OK) {
+		return bytes;
+	}
+	const auto guard = gsl::finally([&] { inflateEnd(&stream); });
+
+	auto result = QByteArray(kMaxSize + 1, Qt::Uninitialized);
+	stream.avail_in = bytes.size();
+	stream.next_in = reinterpret_cast<Bytef*>(const_cast<char*>(bytes.data()));
+	stream.avail_out = 0;
+	while (!stream.avail_out) {
+		stream.avail_out = result.size();
+		stream.next_out = reinterpret_cast<Bytef*>(result.data());
+		int res = inflate(&stream, Z_NO_FLUSH);
+		if (res != Z_OK && res != Z_STREAM_END) {
+			return bytes;
+		} else if (!stream.avail_out) {
+			return bytes;
+		}
+	}
+	result.resize(result.size() - stream.avail_out);
+	return result;
+}
+
+} // namespace
 
 bool ValidateFile(const QString &path) {
-	if (!path.endsWith(qstr(".json"), Qt::CaseInsensitive)) {
+	if (!path.endsWith(qstr(".json"), Qt::CaseInsensitive)
+		&& !path.endsWith(qstr(".tgs"), Qt::CaseInsensitive)) {
 		return false;
 	}
 	return true;
 }
 
 std::unique_ptr<Animation> FromFile(const QString &path) {
-	if (!path.endsWith(qstr(".json"), Qt::CaseInsensitive)) {
+	if (!path.endsWith(qstr(".json"), Qt::CaseInsensitive)
+		&& !path.endsWith(qstr(".tgs"), Qt::CaseInsensitive)) {
 		return nullptr;
 	}
 	auto f = QFile(path);
@@ -50,11 +89,21 @@ Animation::Animation(QByteArray &&content)
 	const auto weak = base::make_weak(this);
 	crl::async([=, content = base::take(content)]() mutable {
 		const auto now = crl::now();
+		content = UnpackGzip(content);
+		if (content.size() > kMaxSize) {
+			qWarning()
+				<< "Lottie Error: Too large file: "
+				<< content.size();
+			crl::on_main(weak, [=] {
+				parseFailed();
+			});
+			return;
+		}
 		const auto document = JsonDocument(std::move(content));
 		const auto parsed = crl::now();
 		if (const auto error = document.error()) {
 			qWarning()
-				<< "Lottie Error: Parse failed with code "
+				<< "Lottie Error: Parse failed with code: "
 				<< error;
 			crl::on_main(weak, [=] {
 				parseFailed();

Telegram/gyp/lib_lottie.gyp

@@ -44,6 +44,7 @@
       '<(src_loc)',
       '<(SHARED_INTERMEDIATE_DIR)',
       '<(libs_loc)/range-v3/include',
+      '<(libs_loc)/zlib',
       '<(lottie_loc)',
       '<(lottie_loc)/bodymovin',
       '<(lottie_loc)/imports',