From d85347f1f2028afb685142a776f2af4473de8273 Mon Sep 17 00:00:00 2001
From: George Hazan <george.hazan@gmail.com>
Date: Thu, 15 Jun 2023 13:08:02 +0300
Subject: memory buffer unzip function moved to core

---
 src/mir_app/src/mir_app.def   |  1 +
 src/mir_app/src/mir_app64.def |  1 +
 src/mir_app/src/utils.cpp     | 42 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 44 insertions(+)

(limited to 'src/mir_app')

diff --git a/src/mir_app/src/mir_app.def b/src/mir_app/src/mir_app.def
index d0abb0ecb0..0f02928081 100644
--- a/src/mir_app/src/mir_app.def
+++ b/src/mir_app/src/mir_app.def
@@ -875,3 +875,4 @@ Clist_RemoveEvent @989
 ?Clist_GetEventByMenu@@YGPAUCListEvent@@H@Z @990 NONAME
 ?Clist_GetEventCount@@YGHXZ @991 NONAME
 ?Chat_EmptyHistory@@YGXPAUSESSION_INFO@@@Z @992 NONAME
+?Utils_Unzip@@YG?AVMBinBuffer@@PBXI@Z @993 NONAME
diff --git a/src/mir_app/src/mir_app64.def b/src/mir_app/src/mir_app64.def
index ce3a55a6fd..9fe2e92c6a 100644
--- a/src/mir_app/src/mir_app64.def
+++ b/src/mir_app/src/mir_app64.def
@@ -875,3 +875,4 @@ Clist_RemoveEvent @989
 ?Clist_GetEventByMenu@@YAPEAUCListEvent@@H@Z @990 NONAME
 ?Clist_GetEventCount@@YAHXZ @991 NONAME
 ?Chat_EmptyHistory@@YAXPEAUSESSION_INFO@@@Z @992 NONAME
+?Utils_Unzip@@YA?AVMBinBuffer@@PEBX_K@Z @993 NONAME
diff --git a/src/mir_app/src/utils.cpp b/src/mir_app/src/utils.cpp
index 42e916d7d7..1c23ded07a 100644
--- a/src/mir_app/src/utils.cpp
+++ b/src/mir_app/src/utils.cpp
@@ -23,6 +23,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
 
 #include "stdafx.h"
+#include "..\..\libs\zlib\src\zlib.h"
 
 #define MS_SYSTEM_GET_MD5I	"Miranda/System/GetMD5I"
 
@@ -372,6 +373,47 @@ bool ProcessFileDrop(HDROP hDrop, MCONTACT hContact)
 
 /////////////////////////////////////////////////////////////////////////////////////////
 
+MIR_APP_DLL(MBinBuffer) Utils_Unzip(const void *pData, size_t cbLen)
+{
+	MBinBuffer res;
+	if (pData == nullptr || cbLen == 0)
+		return res;
+
+	z_stream strm = {};
+	inflateInit(&strm);
+
+	strm.avail_in = (uInt)cbLen;
+	strm.next_in = (Bytef *)pData;
+
+	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;
+			__fallthrough;
+
+		case Z_DATA_ERROR:
+		case Z_MEM_ERROR:
+			inflateEnd(&strm);
+			return res;
+		}
+
+		res.append(buf, sizeof(buf) - strm.avail_out);
+		if (ret == Z_STREAM_END)
+			break;
+	}
+
+	inflateEnd(&strm);
+	return res;
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////
+
 int LoadUtilsModule(void)
 {
 	CreateServiceFunction(MS_UTILS_GETCOUNTRYBYNUMBER, GetCountryByNumber);
-- 
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