diff --git a/src/main.cpp b/src/main.cpp
index b7b3590d..dc019224 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1159,7 +1159,7 @@ int main(int argc, char *argv[])
     }
 #endif
 #if defined(WITH_NRV)
-    if (nrv_init() != NRV_E_OK)
+    if (nrv_init() != NRV_E_OK || NRV_VERSION != nrv_version())
     {
         show_head();
         fprintf(stderr,"nrv_init() failed - check your NRV installation !\n");
diff --git a/src/p_ps1.cpp b/src/p_ps1.cpp
index b31c7d65..4c8d5542 100644
--- a/src/p_ps1.cpp
+++ b/src/p_ps1.cpp
@@ -61,8 +61,9 @@ PackPs1::PackPs1(InputFile *f) :
     COMPILE_TIME_ASSERT(sizeof(ps1_exe_t) == 188);
     COMPILE_TIME_ASSERT(IH_BKUP == 40);
 
-    fdata_size = cfile_size = 0;
+    overlap = 0;
     sa_cnt = 0;
+    fdata_size = cfile_size = 0;
 }
 
 const int *PackPs1::getCompressionMethods(int method, int level) const
@@ -85,16 +86,16 @@ int PackPs1::patch_mips_le16(void *b, int blen, const void *old, unsigned new_)
 {
     unsigned char w[2];
 
-    set_le16(&w,get_be16(old));
-    return patch_le16(b, blen, &w, new_);
+    set_le16(w, get_be16(old));
+    return patch_le16(b, blen, w, new_);
 }
 
 int PackPs1::patch_mips_le32(void *b, int blen, const void *old, unsigned new_)
 {
     unsigned char w[4];
 
-    set_le32(&w,get_be32(old));
-    return patch_le32(b, blen, &w, new_);
+    set_le32(w, get_be32(old));
+    return patch_le32(b, blen, w, new_);
 }
 
 int PackPs1::patch_hi_lo(void *b, int blen, const void *old_hi, const void *old_lo, unsigned new_)
@@ -120,7 +121,7 @@ bool PackPs1::canPack()
     if ((memcmp(&ih.id,"PS-X EXE",8) != 0) && (memcmp(&ih.id,"EXE X-SP",8) != 0))
         return false;
     fi->readx(buf, sizeof(buf));
-    checkAlreadyPacked(&buf, sizeof(buf));
+    checkAlreadyPacked(buf, sizeof(buf));
     if (fdata_size != ih.tx_len || (ih.tx_len & 3))
     {
         if (!opt->force)
@@ -143,7 +144,7 @@ int PackPs1::buildLoader(const Filter *)
 {
     initLoader(nrv_loader,sizeof(nrv_loader));
     addLoader("PSXPREP0","PSXSTSZ0","PSXMAIN0",
-              ih.tx_ptr&0xffff ?  "PSXJSTA0" : "PSXJSTH0",
+              ih.tx_ptr & 0xffff ?  "PSXJSTA0" : "PSXJSTH0",
               "PSXDECO0",
               NULL);
 #ifdef EIGHTBIT
@@ -181,7 +182,7 @@ void PackPs1::pack(OutputFile *fo)
 
     ibuf.alloc(fdata_size);
     obuf.allocForCompression(fdata_size);
-    upx_byte *p_scan = ibuf+(fdata_size-1);
+    const upx_byte *p_scan = ibuf+(fdata_size-1);
 
     // read file
     fi->seek(PS_HDR_SIZE,SEEK_SET);
@@ -201,7 +202,7 @@ void PackPs1::pack(OutputFile *fo)
 
     Filter ft(ph.level);
     // compress (max_match = 65535)
-    compressWithFilters(&ft, 512, 0, NULL, 0, 65535, 0, 0);
+    compressWithFilters(&ft, 512, 0, NULL, 0, 65535);
 
     if (ph.overlap_overhead <= sa_cnt)
         overlap = 0;
@@ -236,10 +237,10 @@ void PackPs1::pack(OutputFile *fo)
     pad = ALIGN_DOWN(pad, 4);
     pad_code = CHK_ALIGNED(ph.c_len, 4);
 
-    unsigned decomp_data_start = ih.tx_ptr;
+    const unsigned decomp_data_start = ih.tx_ptr;
 
     // set the offset for compressed stuff at the very end of file
-    unsigned comp_data_start = (decomp_data_start+pad)-ph.c_len+(overlap ? overlap : 0);
+    const unsigned comp_data_start = (decomp_data_start+pad)-ph.c_len+(overlap ? overlap : 0);
 
     pad = 0;
     if (!opt->ps1.no_align)
diff --git a/src/packer.cpp b/src/packer.cpp
index 5619d057..440df68d 100644
--- a/src/packer.cpp
+++ b/src/packer.cpp
@@ -236,7 +236,7 @@ bool Packer::compress(upx_bytep in, upx_bytep out,
     {
         // decompress
         unsigned new_len = ph.u_len;
-        r = upx_decompress(out,ph.c_len,in,&new_len,ph.method);
+        r = upx_decompress(out, ph.c_len, in, &new_len, ph.method);
         //printf("%d %d: %d %d %d\n", ph.method, r, ph.c_len, ph.u_len, new_len);
         if (r != UPX_E_OK)
             throwInternalError("decompression failed");
diff --git a/src/packhead.cpp b/src/packhead.cpp
index 77013d98..57c12fec 100644
--- a/src/packhead.cpp
+++ b/src/packhead.cpp
@@ -110,7 +110,7 @@ void PackHeader::putPackHeader(upx_bytep p)
     assert(get_le32(p) == UPX_MAGIC_LE32);
     if (get_le32(p+4) != UPX_MAGIC2_LE32)
     {
-        //printf("%x %x\n", get_le32(p+4), UPX_MAGIC2_LE32);
+        //fprintf(stderr, "MAGIC2_LE32: %x %x\n", get_le32(p+4), UPX_MAGIC2_LE32);
         throwBadLoader();
     }
 
diff --git a/src/work.cpp b/src/work.cpp
index 2a9dc1ac..44dcc1ae 100644
--- a/src/work.cpp
+++ b/src/work.cpp
@@ -75,6 +75,8 @@ void do_one_file(const char *iname, char *oname)
 #endif
     if (st.st_size <= 0)
         throwIOException("empty file -- skipped");
+    if (st.st_size >= 1024*1024*1024)
+        throwIOException("file is too large -- skipped");
     if ((st.st_mode & S_IWUSR) == 0)
     {
         bool skip = true;