silence multiple data conversion warnings

src/channel.c

@@ -1622,7 +1622,7 @@ libssh2_channel_receive_window_adjust(LIBSSH2_CHANNEL *channel,
     int rc;
 
     if(!channel)
-        return LIBSSH2_ERROR_BAD_USE;
+        return (unsigned long)LIBSSH2_ERROR_BAD_USE;
 
     BLOCK_ADJUST(rc, channel->session,
                  _libssh2_channel_receive_window_adjust(channel, adj,
@@ -1669,7 +1669,7 @@ _libssh2_channel_extended_data(LIBSSH2_CHANNEL *channel, int ignore_mode)
                        "Setting channel %lu/%lu handle_extended_data"
                        " mode to %d",
                        channel->local.id, channel->remote.id, ignore_mode);
-        channel->remote.extended_data_ignore_mode = ignore_mode;
+        channel->remote.extended_data_ignore_mode = (char)ignore_mode;
 
         channel->extData2_state = libssh2_NB_state_created;
     }

src/keepalive.c

@@ -75,7 +75,8 @@ libssh2_keepalive_send (LIBSSH2_SESSION *session,
         size_t len = sizeof (keepalive_data) - 1;
         int rc;
 
-        keepalive_data[len - 1] = session->keepalive_want_reply;
+        keepalive_data[len - 1] =
+            (unsigned char)session->keepalive_want_reply;
 
         rc = _libssh2_transport_send(session, keepalive_data, len, NULL, 0);
         /* Silently ignore PACKET_EAGAIN here: if the write buffer is
@@ -90,8 +91,8 @@ libssh2_keepalive_send (LIBSSH2_SESSION *session,
         if (seconds_to_next)
             *seconds_to_next = session->keepalive_interval;
     } else if (seconds_to_next) {
-        *seconds_to_next = (int) session->keepalive_last_sent
+        *seconds_to_next = (int) (session->keepalive_last_sent - now)
-            + session->keepalive_interval - now;
+            + session->keepalive_interval;
     }
 
     return 0;

src/misc.c

@@ -266,15 +266,15 @@ libssh2_base64_decode(LIBSSH2_SESSION *session, char **data,
             continue;
         switch (i % 4) {
         case 0:
-            d[len] = v << 2;
+            d[len] = (unsigned char)(v << 2);
             break;
         case 1:
             d[len++] |= v >> 4;
-            d[len] = v << 4;
+            d[len] = (unsigned char)(v << 4);
             break;
         case 2:
             d[len++] |= v >> 2;
-            d[len] = v << 6;
+            d[len] = (unsigned char)(v << 6);
             break;
         case 3:
             d[len++] |= v;
@@ -605,7 +605,7 @@ int __cdecl _libssh2_gettimeofday(struct timeval *tp, void *tzp)
     unsigned __int64 ns100; /*time since 1 Jan 1601 in 100ns units */
     FILETIME ft;
   }  _now;
-
+  (void)tzp;
   if(tp)
     {
       GetSystemTimeAsFileTime (&_now.ft);

src/packet.c

@@ -1157,8 +1157,7 @@ _libssh2_packet_burn(LIBSSH2_SESSION * session,
 {
     unsigned char *data;
     size_t data_len;
-    unsigned char all_packets[255];
+    unsigned char i, all_packets[255];
-    int i;
     int ret;
 
     if (*state == libssh2_NB_state_idle) {
@@ -1193,7 +1192,8 @@ _libssh2_packet_burn(LIBSSH2_SESSION * session,
 
         /* Be lazy, let packet_ask pull it out of the brigade */
         if (0 ==
-            _libssh2_packet_ask(session, ret, &data, &data_len, 0, NULL, 0)) {
+            _libssh2_packet_ask(session, (unsigned char)ret,
+                                         &data, &data_len, 0, NULL, 0)) {
             /* Smoke 'em if you got 'em */
             LIBSSH2_FREE(session, data);
             *state = libssh2_NB_state_idle;

src/scp.c

@@ -727,7 +727,7 @@ scp_recv(LIBSSH2_SESSION * session, const char *path, struct stat * sb)
         sb->st_mtime = session->scpRecv_mtime;
         sb->st_atime = session->scpRecv_atime;
         sb->st_size = session->scpRecv_size;
-        sb->st_mode = session->scpRecv_mode;
+        sb->st_mode = (unsigned short)session->scpRecv_mode;
     }
 
     session->scpRecv_state = libssh2_NB_state_idle;

src/sftp.c

@@ -1618,7 +1618,7 @@ static ssize_t sftp_readdir(LIBSSH2_SFTP_HANDLE *handle, char *buffer,
 
             filename_len = real_filename_len;
             if (filename_len >= buffer_maxlen) {
-                filename_len = LIBSSH2_ERROR_BUFFER_TOO_SMALL;
+                filename_len = (size_t)LIBSSH2_ERROR_BUFFER_TOO_SMALL;
                 goto end;
             }
 
@@ -1633,7 +1633,7 @@ static ssize_t sftp_readdir(LIBSSH2_SFTP_HANDLE *handle, char *buffer,
                 longentry_len = real_longentry_len;
 
                 if (longentry_len >= longentry_maxlen) {
-                    filename_len = LIBSSH2_ERROR_BUFFER_TOO_SMALL;
+                    filename_len = (size_t)LIBSSH2_ERROR_BUFFER_TOO_SMALL;
                     goto end;
                 }
 

src/transport.c

@@ -829,7 +829,7 @@ int _libssh2_transport_send(LIBSSH2_SESSION *session,
        the MAC and the packet_length field itself */
     _libssh2_htonu32(p->outbuf, packet_length - 4);
     /* store padding_length */
-    p->outbuf[4] = padding_length;
+    p->outbuf[4] = (unsigned char)padding_length;
 
     /* fill the padding area with random junk */
     _libssh2_random(p->outbuf + 5 + data_len, padding_length);

src/userauth.c

@@ -216,7 +216,8 @@ userauth_password(LIBSSH2_SESSION *session,
          * chgpwdbool(1) + password_len(4) */
         session->userauth_pswd_data_len = username_len + 40;
 
-        session->userauth_pswd_data0 = ~SSH_MSG_USERAUTH_PASSWD_CHANGEREQ;
+        session->userauth_pswd_data0 =
+            (unsigned char) ~SSH_MSG_USERAUTH_PASSWD_CHANGEREQ;
 
         /* TODO: remove this alloc with a fixed buffer in the session
            struct */

src/wincng.c

@@ -1278,7 +1278,8 @@ _libssh2_wincng_pub_priv_keyfile(LIBSSH2_SESSION *session,
     unsigned char *pbEncoded, **rpbDecoded;
     unsigned long cbEncoded, *rcbDecoded;
     unsigned char *key = NULL, *mth = NULL;
-    unsigned long keylen, mthlen, index, offset, length;
+    unsigned long keylen = 0, mthlen = 0;
+    unsigned long index, offset, length;
     int ret;
 
     ret = _libssh2_wincng_load_private(session, privatekey, passphrase,