diff --git a/examples/frameCompress.c b/examples/frameCompress.c
index 2cc4649..a189329 100644
--- a/examples/frameCompress.c
+++ b/examples/frameCompress.c
@@ -70,11 +70,12 @@ compress_file_internal(FILE* f_in, FILE* f_out,
     /* write frame header */
     {   size_t const headerSize = LZ4F_compressBegin(ctx, outBuff, outCapacity, &kPrefs);
         if (LZ4F_isError(headerSize)) {
-            printf("Failed to start compression: error %zu\n", headerSize);
+            printf("Failed to start compression: error %u \n", (unsigned)headerSize);
             return result;
         }
         count_out = headerSize;
-        printf("Buffer size is %zu bytes, header size %zu bytes\n", outCapacity, headerSize);
+        printf("Buffer size is %u bytes, header size %u bytes \n",
+                (unsigned)outCapacity, (unsigned)headerSize);
         safe_fwrite(outBuff, 1, headerSize, f_out);
     }
 
@@ -89,11 +90,11 @@ compress_file_internal(FILE* f_in, FILE* f_out,
                                                 inBuff, readSize,
                                                 NULL);
         if (LZ4F_isError(compressedSize)) {
-            printf("Compression failed: error %zu\n", compressedSize);
+            printf("Compression failed: error %u \n", (unsigned)compressedSize);
             return result;
         }
 
-        printf("Writing %zu bytes\n", compressedSize);
+        printf("Writing %u bytes\n", (unsigned)compressedSize);
         safe_fwrite(outBuff, 1, compressedSize, f_out);
         count_out += compressedSize;
     }
@@ -103,11 +104,11 @@ compress_file_internal(FILE* f_in, FILE* f_out,
                                                 outBuff, outCapacity,
                                                 NULL);
         if (LZ4F_isError(compressedSize)) {
-            printf("Failed to end compression: error %zu\n", compressedSize);
+            printf("Failed to end compression: error %u \n", (unsigned)compressedSize);
             return result;
         }
 
-        printf("Writing %zu bytes\n", compressedSize);
+        printf("Writing %u bytes \n", (unsigned)compressedSize);
         safe_fwrite(outBuff, 1, compressedSize, f_out);
         count_out += compressedSize;
     }
diff --git a/lib/lz4.c b/lib/lz4.c
index df7a2c7..3c7467a 100644
--- a/lib/lz4.c
+++ b/lib/lz4.c
@@ -522,13 +522,14 @@ static U32 LZ4_hash4(U32 sequence, tableType_t const tableType)
 
 static U32 LZ4_hash5(U64 sequence, tableType_t const tableType)
 {
-    static const U64 prime5bytes = 889523592379ULL;
-    static const U64 prime8bytes = 11400714785074694791ULL;
     const U32 hashLog = (tableType == byU16) ? LZ4_HASHLOG+1 : LZ4_HASHLOG;
-    if (LZ4_isLittleEndian())
+    if (LZ4_isLittleEndian()) {
+        const U64 prime5bytes = 889523592379ULL;
         return (U32)(((sequence << 24) * prime5bytes) >> (64 - hashLog));
-    else
+    } else {
+        const U64 prime8bytes = 11400714785074694791ULL;
         return (U32)(((sequence >> 24) * prime8bytes) >> (64 - hashLog));
+    }
 }
 
 LZ4_FORCE_INLINE U32 LZ4_hashPosition(const void* const p, tableType_t const tableType)
diff --git a/programs/lz4io.c b/programs/lz4io.c
index 28d6537..cdc4c27 100644
--- a/programs/lz4io.c
+++ b/programs/lz4io.c
@@ -331,42 +331,48 @@ static int LZ4IO_LZ4_compress(const char* src, char* dst, int srcSize, int dstSi
  * It generates compressed streams using the old 'legacy' format */
 int LZ4IO_compressFilename_Legacy(const char* input_filename, const char* output_filename, int compressionlevel)
 {
-    int (*compressionFunction)(const char* src, char* dst, int srcSize, int dstSize, int cLevel);
+    typedef int (*compress_f)(const char* src, char* dst, int srcSize, int dstSize, int cLevel);
+    compress_f const compressionFunction = (compressionlevel < 3) ? LZ4IO_LZ4_compress : LZ4_compress_HC;
     unsigned long long filesize = 0;
     unsigned long long compressedfilesize = MAGICNUMBER_SIZE;
     char* in_buff;
     char* out_buff;
     const int outBuffSize = LZ4_compressBound(LEGACY_BLOCKSIZE);
-    FILE* finput;
+    FILE* const finput = LZ4IO_openSrcFile(input_filename);
     FILE* foutput;
     clock_t clockEnd;
 
     /* Init */
     clock_t const clockStart = clock();
-    compressionFunction = (compressionlevel < 3) ? LZ4IO_LZ4_compress : LZ4_compress_HC;
+    if (finput == NULL)
+        EXM_THROW(20, "%s : open file error ", input_filename);
 
-    finput = LZ4IO_openSrcFile(input_filename);
-    if (finput == NULL) EXM_THROW(20, "%s : open file error ", input_filename);
     foutput = LZ4IO_openDstFile(output_filename);
-    if (foutput == NULL) { fclose(finput); EXM_THROW(20, "%s : open file error ", input_filename); }
+    if (foutput == NULL) {
+        fclose(finput);
+        EXM_THROW(20, "%s : open file error ", input_filename);
+    }
 
     /* Allocate Memory */
     in_buff = (char*)malloc(LEGACY_BLOCKSIZE);
-    out_buff = (char*)malloc(outBuffSize);
-    if (!in_buff || !out_buff) EXM_THROW(21, "Allocation error : not enough memory");
+    out_buff = (char*)malloc(outBuffSize + 4);
+    if (!in_buff || !out_buff)
+        EXM_THROW(21, "Allocation error : not enough memory");
 
     /* Write Archive Header */
     LZ4IO_writeLE32(out_buff, LEGACY_MAGICNUMBER);
-    { size_t const sizeCheck = fwrite(out_buff, 1, MAGICNUMBER_SIZE, foutput);
-      if (sizeCheck != MAGICNUMBER_SIZE) EXM_THROW(22, "Write error : cannot write header"); }
+    {   size_t const writeSize = fwrite(out_buff, 1, MAGICNUMBER_SIZE, foutput);
+        if (writeSize != MAGICNUMBER_SIZE)
+            EXM_THROW(22, "Write error : cannot write header");
+    }
 
     /* Main Loop */
     while (1) {
-        unsigned int outSize;
+        int outSize;
         /* Read Block */
-        size_t const inSize = (int) fread(in_buff, (size_t)1, (size_t)LEGACY_BLOCKSIZE, finput);
+        size_t const inSize = fread(in_buff, (size_t)1, (size_t)LEGACY_BLOCKSIZE, finput);
+        assert(inSize <= LEGACY_BLOCKSIZE);
         if (inSize == 0) break;
-        if (inSize > LEGACY_BLOCKSIZE) EXM_THROW(23, "Read error : wrong fread() size report ");   /* should be impossible */
         filesize += inSize;
 
         /* Compress Block */
@@ -376,9 +382,11 @@ int LZ4IO_compressFilename_Legacy(const char* input_filename, const char* output
                 (int)(filesize>>20), (double)compressedfilesize/filesize*100);
 
         /* Write Block */
-        LZ4IO_writeLE32(out_buff, outSize);
-        {   size_t const sizeCheck = fwrite(out_buff, 1, outSize+4, foutput);
-            if (sizeCheck!=(size_t)(outSize+4))
+        assert(outSize > 0);
+        assert(outSize < outBuffSize);
+        LZ4IO_writeLE32(out_buff, (unsigned)outSize);
+        {   size_t const writeSize = fwrite(out_buff, 1, outSize+4, foutput);
+            if (writeSize != (size_t)(outSize+4))
                 EXM_THROW(24, "Write error : cannot write compressed block");
     }   }
     if (ferror(finput)) EXM_THROW(25, "Error while reading %s ", input_filename);
diff --git a/tests/frametest.c b/tests/frametest.c
index 5714732..f8498b7 100644
--- a/tests/frametest.c
+++ b/tests/frametest.c
@@ -343,9 +343,10 @@ int basicTests(U32 seed, double compressibility)
                 op += oSize;
                 ip += iSize;
             }
-            { U64 const crcDest = XXH64(decodedBuffer, COMPRESSIBLE_NOISE_LENGTH, 1);
-              if (crcDest != crcOrig) goto _output_error; }
-            DISPLAYLEVEL(3, "Regenerated %u/%u bytes \n", (unsigned)(op-ostart), COMPRESSIBLE_NOISE_LENGTH);
+            {   U64 const crcDest = XXH64(decodedBuffer, COMPRESSIBLE_NOISE_LENGTH, 1);
+                if (crcDest != crcOrig) goto _output_error;
+            }
+            DISPLAYLEVEL(3, "Regenerated %u/%u bytes \n", (unsigned)(op-ostart), (unsigned)COMPRESSIBLE_NOISE_LENGTH);
         }
     }
 
@@ -840,8 +841,8 @@ int fuzzerTests(U32 seed, unsigned nbTests, unsigned startTest, double compressi
                 size_t const iSize = MIN(sampleMax, (size_t)(iend-ip));
                 size_t const oSize = LZ4F_compressBound(iSize, prefsPtr);
                 cOptions.stableSrc = ((FUZ_rand(&randState) & 3) == 1);
-                DISPLAYLEVEL(6, "Sending %zu bytes to compress (stableSrc:%u) \n",
-                                iSize, cOptions.stableSrc);
+                DISPLAYLEVEL(6, "Sending %u bytes to compress (stableSrc:%u) \n",
+                                (unsigned)iSize, cOptions.stableSrc);
 
                 result = LZ4F_compressUpdate(cCtx, op, oSize, ip, iSize, &cOptions);
                 CHECK(LZ4F_isError(result), "Compression failed (error %i : %s)", (int)result, LZ4F_getErrorName(result));