From de4fcb29cffd8fb208c05df76c97526bcbdae048 Mon Sep 17 00:00:00 2001
From: Timofey Solomko <tsolomko@gmail.com>
Date: Thu, 23 Sep 2021 21:50:35 +0300
Subject: [PATCH] [LZ4] Add an empty implementation of LZ4

---
 SWCompression.xcodeproj/project.pbxproj | 12 ++++++++++++
 Sources/LZ4/LZ4.swift                   | 20 ++++++++++++++++++++
 2 files changed, 32 insertions(+)
 create mode 100644 Sources/LZ4/LZ4.swift

diff --git a/SWCompression.xcodeproj/project.pbxproj b/SWCompression.xcodeproj/project.pbxproj
index 0fabcc7f..991bf8a3 100644
--- a/SWCompression.xcodeproj/project.pbxproj
+++ b/SWCompression.xcodeproj/project.pbxproj
@@ -221,6 +221,7 @@
 		E66F36242538726E00076A6E /* test_empty.lzma in Resources */ = {isa = PBXBuildFile; fileRef = E66F36232538726E00076A6E /* test_empty.lzma */; };
 		E66F362C2538E2B700076A6E /* test_empty.zlib in Resources */ = {isa = PBXBuildFile; fileRef = E66F362B2538E2B700076A6E /* test_empty.zlib */; };
 		E6791E1826FD001A003852A9 /* DataError.swift in Sources */ = {isa = PBXBuildFile; fileRef = E6791E1726FD001A003852A9 /* DataError.swift */; };
+		E6791E1B26FD0094003852A9 /* LZ4.swift in Sources */ = {isa = PBXBuildFile; fileRef = E6791E1A26FD0094003852A9 /* LZ4.swift */; };
 		E6EDD6A826F7767F00884532 /* test_minor_version_3.7z in Resources */ = {isa = PBXBuildFile; fileRef = E6EDD6A626F7767E00884532 /* test_minor_version_3.7z */; };
 		E6EDD6A926F7767F00884532 /* test_minor_version_4.7z in Resources */ = {isa = PBXBuildFile; fileRef = E6EDD6A726F7767E00884532 /* test_minor_version_4.7z */; };
 		E6EDD6AC26F77C0E00884532 /* test_minor_version_2.7z in Resources */ = {isa = PBXBuildFile; fileRef = E6EDD6AB26F77C0E00884532 /* test_minor_version_2.7z */; };
@@ -452,6 +453,7 @@
 		E66F36232538726E00076A6E /* test_empty.lzma */ = {isa = PBXFileReference; lastKnownFileType = file; path = test_empty.lzma; sourceTree = "<group>"; };
 		E66F362B2538E2B700076A6E /* test_empty.zlib */ = {isa = PBXFileReference; lastKnownFileType = file; path = test_empty.zlib; sourceTree = "<group>"; };
 		E6791E1726FD001A003852A9 /* DataError.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DataError.swift; sourceTree = "<group>"; };
+		E6791E1A26FD0094003852A9 /* LZ4.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LZ4.swift; sourceTree = "<group>"; };
 		E6EDD6A626F7767E00884532 /* test_minor_version_3.7z */ = {isa = PBXFileReference; lastKnownFileType = file; path = test_minor_version_3.7z; sourceTree = "<group>"; };
 		E6EDD6A726F7767E00884532 /* test_minor_version_4.7z */ = {isa = PBXFileReference; lastKnownFileType = file; path = test_minor_version_4.7z; sourceTree = "<group>"; };
 		E6EDD6AB26F77C0E00884532 /* test_minor_version_2.7z */ = {isa = PBXFileReference; lastKnownFileType = file; path = test_minor_version_2.7z; sourceTree = "<group>"; };
@@ -590,6 +592,7 @@
 				0680B4C31F8814C400C5F253 /* BZip2 */,
 				0680B4C41F8814EB00C5F253 /* LZMA */,
 				06A1728C1FA5DCF00048A89C /* LZMA2 */,
+				E6791E1926FD0070003852A9 /* LZ4 */,
 				0680B4C61F88151400C5F253 /* XZ */,
 				06C936831F881A0B008BBF0E /* GZip */,
 				06C936841F881A28008BBF0E /* Zlib */,
@@ -917,6 +920,14 @@
 			path = BZip2;
 			sourceTree = "<group>";
 		};
+		E6791E1926FD0070003852A9 /* LZ4 */ = {
+			isa = PBXGroup;
+			children = (
+				E6791E1A26FD0094003852A9 /* LZ4.swift */,
+			);
+			path = LZ4;
+			sourceTree = "<group>";
+		};
 /* End PBXGroup section */
 
 /* Begin PBXNativeTarget section */
@@ -1163,6 +1174,7 @@
 				06A960561F1E7D0B0078E6D1 /* 7zPackInfo.swift in Sources */,
 				06DE29B81FB7024C0098A761 /* LittleEndianByteReader+Zip.swift in Sources */,
 				06BAC5941F8CFF28002443F4 /* ZipEntryInfo.swift in Sources */,
+				E6791E1B26FD0094003852A9 /* LZ4.swift in Sources */,
 				0625C49F1FB4B92F00A52C43 /* CompressionMethod+7z.swift in Sources */,
 				0620F4B31F8E2477001C9B7A /* ContainerEntry.swift in Sources */,
 				061C06301F0E8A4900832F0C /* ZlibError.swift in Sources */,
diff --git a/Sources/LZ4/LZ4.swift b/Sources/LZ4/LZ4.swift
new file mode 100644
index 00000000..ee184fff
--- /dev/null
+++ b/Sources/LZ4/LZ4.swift
@@ -0,0 +1,20 @@
+// Copyright (c) 2021 Timofey Solomko
+// Licensed under MIT License
+//
+// See LICENSE for license information
+
+import Foundation
+import BitByteData
+
+public enum LZ4: DecompressionAlgorithm {
+
+    public static func decompress(data: Data) throws -> Data {
+        let reader = LittleEndianByteReader(data: data)
+        // TODO: Switch between frame and block decoding modes?
+        // TODO: Small/empty data size check.
+        guard reader.uint32() == 0x184D2204
+            else { throw DataError.corrupted }
+        fatalError("Not implemented yet")
+    }
+
+}