From b87a8e9e623d6e2404ae9f948a4e0ee8f1415bee Mon Sep 17 00:00:00 2001
From: Yann Collet <cyan@fb.com>
Date: Mon, 10 Sep 2018 16:48:41 -0700
Subject: [PATCH] fixed minor warning in fuzzer.c

added a few more comments and assert()
---
 lib/lz4.c      | 14 ++++++++------
 lib/lz4.h      |  8 ++++----
 tests/fuzzer.c |  1 -
 3 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/lib/lz4.c b/lib/lz4.c
index 0545bbc5..133501db 100644
--- a/lib/lz4.c
+++ b/lib/lz4.c
@@ -1,6 +1,6 @@
 /*
    LZ4 - Fast LZ compression algorithm
-   Copyright (C) 2011-2017, Yann Collet.
+   Copyright (C) 2011-present, Yann Collet.
 
    BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
 
@@ -1405,9 +1405,9 @@ LZ4_decompress_generic(
                  int srcSize,
                  int outputSize,         /* If endOnInput==endOnInputSize, this value is `dstCapacity` */
 
-                 endCondition_directive endOnInput,     /* endOnOutputSize, endOnInputSize */
-                 earlyEnd_directive partialDecoding,    /* full, partial */
-                 int dict,               /* noDict, withPrefix64k, usingExtDict */
+                 endCondition_directive endOnInput,   /* endOnOutputSize, endOnInputSize */
+                 earlyEnd_directive partialDecoding,  /* full, partial */
+                 dict_directive dict,                 /* noDict, withPrefix64k, usingExtDict */
                  const BYTE* const lowPrefix,  /* always <= dst, == dst when no prefix */
                  const BYTE* const dictStart,  /* only if dict==usingExtDict */
                  const size_t dictSize         /* note : = 0 if noDict */
@@ -1434,6 +1434,7 @@ LZ4_decompress_generic(
     DEBUGLOG(5, "LZ4_decompress_generic (srcSize:%i, dstSize:%i)", srcSize, outputSize);
 
     /* Special cases */
+    assert(lowPrefix <= op);
     assert(src != NULL);
     if ((endOnInput) && (unlikely(outputSize==0))) return ((srcSize==1) && (*ip==0)) ? 0 : -1;  /* Empty output buffer */
     if ((!endOnInput) && (unlikely(outputSize==0))) return (*ip==0 ? 1 : -1);
@@ -1504,6 +1505,7 @@ LZ4_decompress_generic(
 
         /* copy literals */
         cpy = op+length;
+        LZ4_STATIC_ASSERT(MFLIMIT >= WILDCOPYLENGTH);
         if ( ((endOnInput) && ((cpy>oend-MFLIMIT) || (ip+length>iend-(2+1+LASTLITERALS))) )
           || ((!endOnInput) && (cpy>oend-WILDCOPYLENGTH)) )
         {
@@ -1523,7 +1525,7 @@ LZ4_decompress_generic(
             }
 
         } else {
-            LZ4_wildCopy(op, ip, cpy);
+            LZ4_wildCopy(op, ip, cpy);   /* may overwrite up to WILDCOPYLENGTH beyond cpy */
             ip += length; op = cpy;
         }
 
@@ -1584,7 +1586,7 @@ _copy_match:
         /* copy match within block */
         cpy = op + length;
 
-        /* specific : partial decode : does not respect end parsing restrictions */
+        /* partialDecoding : may not respect endBlock parsing restrictions */
         assert(op<=oend);
         if (partialDecoding && (cpy > oend-12)) {
             size_t const mlen = MIN(length, (size_t)(oend-op));
diff --git a/lib/lz4.h b/lib/lz4.h
index c8ee206a..059ef7c1 100644
--- a/lib/lz4.h
+++ b/lib/lz4.h
@@ -1,7 +1,7 @@
 /*
  *  LZ4 - Fast LZ compression algorithm
  *  Header File
- *  Copyright (C) 2011-2017, Yann Collet.
+ *  Copyright (C) 2011-present, Yann Collet.
 
    BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
 
@@ -46,7 +46,7 @@ extern "C" {
 /**
   Introduction
 
-  LZ4 is lossless compression algorithm, providing compression speed at 400 MB/s per core,
+  LZ4 is lossless compression algorithm, providing compression speed at 500 MB/s per core,
   scalable with multi-cores CPU. It features an extremely fast decoder, with speed in
   multiple GB/s per core, typically reaching RAM speed limits on multi-core systems.
 
@@ -62,8 +62,8 @@ extern "C" {
 
   An additional format, called LZ4 frame specification (doc/lz4_Frame_format.md),
   take care of encoding standard metadata alongside LZ4-compressed blocks.
-  If your application requires interoperability, it's recommended to use it.
-  A library is provided to take care of it, see lz4frame.h.
+  Frame format is required for interoperability.
+  It is delivered through a companion API, declared in lz4frame.h.
 */
 
 /*^***************************************************************
diff --git a/tests/fuzzer.c b/tests/fuzzer.c
index d6a5f511..b29e82e4 100644
--- a/tests/fuzzer.c
+++ b/tests/fuzzer.c
@@ -583,7 +583,6 @@ static int FUZ_test(U32 seed, U32 nbCycles, const U32 startCycle, const double c
         {   size_t const missingBytes = FUZ_rand(&randState) % blockSize;
             int const targetSize = (int)(blockSize - missingBytes);
             char const sentinel = decodedBuffer[targetSize] = block[targetSize] ^ 0x5A;
-            assert(decodedBuffer[targetSize] == sentinel);
             int const decResult = LZ4_decompress_safe_partial(compressedBuffer, decodedBuffer, compressedSize, targetSize, blockSize);
             FUZ_CHECKTEST(decResult<0, "LZ4_decompress_safe_partial failed despite valid input data (error:%i)", decResult);
             FUZ_CHECKTEST(decResult != targetSize, "LZ4_decompress_safe_partial did not regenerated required amount of data (%i < %i <= %i)", decResult, targetSize, blockSize);