Resolve some erros for MSVC

libxisf.cpp

@@ -86,12 +86,12 @@ static void byteShuffle(ByteArray &data, int itemSize)
     {
         ByteArray &input = data;
         ByteArray output(input.size());
-        int num = input.size() / itemSize;
+        size_t num = input.size() / itemSize;
         char *s = output.data();
         for(int i=0; i<itemSize; i++)
         {
             const char *u = input.constData() + i;
-            for(int o=0; o<num; o++, s++, u += itemSize)
+            for(size_t o=0; o<num; o++, s++, u += itemSize)
                 *s = *u;
         }
         memcpy(s, input.constData() + num * itemSize, input.size() % itemSize);
@@ -105,12 +105,12 @@ static void byteUnshuffle(ByteArray &data, int itemSize)
     {
         ByteArray &input = data;
         ByteArray output(input.size());
-        int num = input.size() / itemSize;
+        size_t num = input.size() / itemSize;
         const char *s = input.constData();
         for(int i=0; i<itemSize; i++)
         {
             char *u = output.data() + i;
-            for(int o=0; o<num; o++, s++, u += itemSize)
+            for(size_t o=0; o<num; o++, s++, u += itemSize)
                 *u = *s;
         }
         memcpy(output.data() + num * itemSize, s, input.size() % itemSize);

streambuffer.cpp

@@ -89,7 +89,7 @@ std::streamsize StreamBuffer::xsgetn(char_type *s, std::streamsize n)
     std::streamsize len = egptr() - gptr();
     if(len > 0)
     {
-        std::streamsize c = std::min(n, len);
+        std::streamsize c = n < len ? n : len;
         std::memcpy(s, gptr(), c);
         gbump(c);
         ret = c;

utils.cpp

@@ -52,7 +52,7 @@ void sha1(uint8_t *data, size_t len, uint8_t *hash)
     nlen += 64 - nlen % 64;
     tmp.resize(nlen, 0);
 
-    size_t ml = len * 8;
+    uint64_t ml = len * 8;
     tmp[nlen - 1] = ml & 0xff;
     tmp[nlen - 2] = ml >>  8 & 0xff;
     tmp[nlen - 3] = ml >> 16 & 0xff;