WhatsApp: zipped nodes support

1 files changed, 34 insertions, 0 deletions

diff --git a/protocols/WhatsAppWeb/src/utils.cpp b/protocols/WhatsAppWeb/src/utils.cpp
index 4c8fb5d8ca..509f277f49 100644
--- a/protocols/WhatsAppWeb/src/utils.cpp
+++ b/protocols/WhatsAppWeb/src/utils.cpp
@@ -344,3 +344,37 @@ void WhatsAppProto::Popup(MCONTACT hContact, const wchar_t *szMsg, const wchar_t
 	ppd.hContact = hContact;
 	Popup_AddClass(&ppd);
 }
+
+/////////////////////////////////////////////////////////////////////////////////////////
+
+MBinBuffer WhatsAppProto::unzip(const MBinBuffer &src)
+{
+	z_stream strm = {};
+	inflateInit(&strm);
+
+	strm.avail_in = src.length();
+	strm.next_in = (Bytef *)src.data();
+
+	MBinBuffer res;
+	Bytef buf[2048];
+
+	while (strm.avail_in > 0) {
+		strm.avail_out = sizeof(buf);
+		strm.next_out = buf;
+
+		int ret = inflate(&strm, Z_NO_FLUSH);
+		switch (ret) {
+		case Z_NEED_DICT:
+			ret = Z_DATA_ERROR;     /* and fall through */
+		case Z_DATA_ERROR:
+		case Z_MEM_ERROR:
+			inflateEnd(&strm);
+			return ret;
+		}
+
+		res.append(buf, sizeof(buf) - strm.avail_out);
+	}
+
+	inflateEnd(&strm);
+	return res;
+}
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