From f28bd1972fd96cea476d537fe1b9b5953473161a Mon Sep 17 00:00:00 2001
From: topjohnwu <topjohnwu@gmail.com>
Date: Thu, 21 Feb 2019 00:52:47 -0500
Subject: [PATCH] Adjust LZ4F block size

---
 native/jni/magiskboot/compress.cpp | 4 ++--
 native/jni/magiskboot/compress.h   | 1 +
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/native/jni/magiskboot/compress.cpp b/native/jni/magiskboot/compress.cpp
index b93c8e844..b46fe8c87 100644
--- a/native/jni/magiskboot/compress.cpp
+++ b/native/jni/magiskboot/compress.cpp
@@ -410,7 +410,7 @@ bool LZ4FEncoder::update(const void *in, size_t size) {
 	auto inbuf = (const uint8_t *) in;
 	size_t read, write;
 	do {
-		read = size > CHUNK ? CHUNK : size;
+		read = size > BLOCK_SZ ? BLOCK_SZ : size;
 		write = LZ4F_compressUpdate(ctx, outbuf, outCapacity, inbuf, read, nullptr);
 		if (LZ4F_isError(write)) {
 			LOGW("LZ4 encode error: %s\n", LZ4F_getErrorName(write));
@@ -442,7 +442,7 @@ void LZ4FEncoder::write_header() {
 			.contentChecksumFlag = LZ4F_contentChecksumEnabled
 		}
 	};
-	outCapacity = LZ4F_compressBound(CHUNK, &prefs);
+	outCapacity = LZ4F_compressBound(BLOCK_SZ, &prefs);
 	outbuf = new uint8_t[outCapacity];
 	size_t write = LZ4F_compressBegin(ctx, outbuf, outCapacity, &prefs);
 	total += write;
diff --git a/native/jni/magiskboot/compress.h b/native/jni/magiskboot/compress.h
index 7529915c1..e83e78768 100644
--- a/native/jni/magiskboot/compress.h
+++ b/native/jni/magiskboot/compress.h
@@ -140,6 +140,7 @@ public:
 	uint64_t finalize() override;
 
 private:
+	static constexpr size_t BLOCK_SZ = 1 << 22;
 	LZ4F_compressionContext_t ctx;
 	uint8_t *outbuf;
 	size_t outCapacity;