diff --git a/main.c b/main.c
index fa5178b..d671af2 100644
--- a/main.c
+++ b/main.c
@@ -180,12 +180,19 @@ char *make_full_path (char *s) {
   return s;
 }
 
-void running_for_first_time (void) {
-  if (sizeof (void) != 1) {
-    logprintf ("sizeof (void) isn't equal 1\n");
-    logprintf ("GNU C compiler extension isn't available?\n");
+void check_type_sizes (void) {
+  if (sizeof (int) != 4u) {
+    logprintf ("sizeof (int) isn't equal 4.\n");
     exit (1);
   }
+  if (sizeof (char) != 1u) {
+    logprintf ("sizeof (char) isn't equal 1.\n");
+    exit (1);
+  }
+}
+
+void running_for_first_time (void) {
+  check_type_sizes ();
   if (config_filename) {
     return; // Do not create custom config file
   }
diff --git a/mtproto-client.c b/mtproto-client.c
index fb4103f..7f1d592 100644
--- a/mtproto-client.c
+++ b/mtproto-client.c
@@ -40,7 +40,6 @@
 #include <netinet/in.h>
 #include <netinet/tcp.h>
 #include <poll.h>
-#include <zlib.h>
 
 #include "net.h"
 #include "include.h"
@@ -1493,26 +1492,13 @@ void work_packed (struct connection *c, long long msg_id) {
     
   int l = prefetch_strlen ();
   char *s = fetch_str (l);
-  size_t dl = MAX_PACKED_SIZE;
 
-  z_stream strm;
-  memset (&strm, 0, sizeof (strm));
-  assert (inflateInit2 (&strm, 16 + MAX_WBITS) == Z_OK);
-  strm.avail_in = l;
-  strm.next_in = (void *)s;
-  strm.avail_out = MAX_PACKED_SIZE;
-  strm.next_out = (void *)buf;
-
-  int err = inflate (&strm, Z_FINISH);
-  if (verbosity) {
-    logprintf ( "inflate error = %d\n", err);
-    logprintf ( "inflated %d bytes\n", (int)strm.total_out);
-  }
+  int total_out = tinflate (s, l, buf, MAX_PACKED_SIZE);
   int *end = in_ptr;
   int *eend = in_end;
-  assert (dl % 4 == 0);
+  //assert (total_out % 4 == 0);
   in_ptr = buf;
-  in_end = in_ptr + strm.total_out / 4;
+  in_end = in_ptr + total_out / 4;
   if (verbosity >= 4) {
     logprintf ( "Unzipped data: ");
     hexdump_in ();
diff --git a/mtproto-common.c b/mtproto-common.c
index 8175864..6d958de 100644
--- a/mtproto-common.c
+++ b/mtproto-common.c
@@ -52,7 +52,7 @@ long long rsa_encrypted_chunks, rsa_decrypted_chunks;
 BN_CTX *BN_ctx;
 int verbosity;
 
-int get_random_bytes (void *buf, int n) {
+int get_random_bytes (unsigned char *buf, int n) {
   int r = 0, h = open ("/dev/random", O_RDONLY | O_NONBLOCK);
   if (h >= 0) {
     r = read (h, buf, n);
diff --git a/mtproto-common.h b/mtproto-common.h
index 0fda8c8..5f7218d 100644
--- a/mtproto-common.h
+++ b/mtproto-common.h
@@ -427,7 +427,7 @@ static inline void fetch_ints (void *data, int count) {
   in_ptr += count;
 }
 
-int get_random_bytes (void *buf, int n);
+int get_random_bytes (unsigned char *buf, int n);
 
 int pad_rsa_encrypt (char *from, int from_len, char *to, int size, BIGNUM *N, BIGNUM *E);
 int pad_rsa_decrypt (char *from, int from_len, char *to, int size, BIGNUM *N, BIGNUM *D);
diff --git a/net.c b/net.c
index 5d62e87..6c672fc 100644
--- a/net.c
+++ b/net.c
@@ -115,7 +115,8 @@ void delete_connection_buffer (struct connection_buffer *b) {
   tfree (b, sizeof (*b));
 }
 
-int write_out (struct connection *c, const void *data, int len) {
+int write_out (struct connection *c, const void *_data, int len) {
+  const unsigned char *data = _data;
   if (!len) { return 0; }
   assert (len > 0);
   int x = 0;
@@ -146,7 +147,8 @@ int write_out (struct connection *c, const void *data, int len) {
   return x;
 }
 
-int read_in (struct connection *c, void *data, int len) {
+int read_in (struct connection *c, void *_data, int len) {
+  unsigned char *data = _data;
   if (!len) { return 0; }
   assert (len > 0);
   if (len > c->in_bytes) {
@@ -177,7 +179,8 @@ int read_in (struct connection *c, void *data, int len) {
   return x;
 }
 
-int read_in_lookup (struct connection *c, void *data, int len) {
+int read_in_lookup (struct connection *c, void *_data, int len) {
+  unsigned char *data = _data;
   if (!len || !c->in_bytes) { return 0; }
   assert (len > 0);
   if (len > c->in_bytes) {
diff --git a/net.h b/net.h
index 69a473b..181c46c 100644
--- a/net.h
+++ b/net.h
@@ -93,10 +93,10 @@ struct dc_serialized {
 };
 
 struct connection_buffer {
-  void *start;
-  void *end;
-  void *rptr;
-  void *wptr;
+  unsigned char *start;
+  unsigned char *end;
+  unsigned char *rptr;
+  unsigned char *wptr;
   struct connection_buffer *next;
 };
 
diff --git a/queries.c b/queries.c
index 3fbfb24..08ce056 100644
--- a/queries.c
+++ b/queries.c
@@ -20,7 +20,6 @@
 #include <string.h>
 #include <memory.h>
 #include <stdlib.h>
-#include <zlib.h>
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -215,26 +214,12 @@ void query_result (long long id UU) {
     fetch_int ();
     int l = prefetch_strlen ();
     char *s = fetch_str (l);
-    size_t dl = MAX_PACKED_SIZE;
-
-    z_stream strm;
-    memset (&strm, 0, sizeof (strm));
-    assert (inflateInit2 (&strm, 16 + MAX_WBITS) == Z_OK);
-    strm.avail_in = l;
-    strm.next_in = (void *)s;
-    strm.avail_out = MAX_PACKED_SIZE;
-    strm.next_out = (void *)packed_buffer;
-
-    int err = inflate (&strm, Z_FINISH);
-    if (verbosity) {
-      logprintf ( "inflate error = %d\n", err);
-      logprintf ( "inflated %d bytes\n", (int)strm.total_out);
-    }
+    int total_out = tinflate (s, l, packed_buffer, MAX_PACKED_SIZE);
     end = in_ptr;
     eend = in_end;
-    assert (dl % 4 == 0);
+    //assert (total_out % 4 == 0);
     in_ptr = packed_buffer;
-    in_end = in_ptr + strm.total_out / 4;
+    in_end = in_ptr + total_out / 4;
     if (verbosity >= 4) {
       logprintf ( "Unzipped data: ");
       hexdump_in ();
@@ -2329,7 +2314,7 @@ void do_create_keys_end (struct secret_chat *U) {
   ensure_ptr (a);
   ensure (BN_mod_exp (r, g_b, a, p, ctx));
 
-  void *t = talloc (256);
+  unsigned char *t = talloc (256);
   memcpy (t, U->key, 256);
   
   memset (U->key, 0, sizeof (U->key));
diff --git a/tools.c b/tools.c
index 1fccb5e..8bed89b 100644
--- a/tools.c
+++ b/tools.c
@@ -24,10 +24,12 @@
 #include <stdlib.h>
 #include <string.h>
 #include <openssl/err.h>
+#include <zlib.h>
 
 #include "interface.h"
 #include "tools.h"
 
+extern int verbosity;
 
 static void out_of_memory (void) {
   logprintf ("Out of memory\n");
@@ -137,3 +139,26 @@ void ensure_ptr (void *p) {
     out_of_memory ();
   }
 }
+
+int tinflate (void *input, int ilen, void *output, int olen) {
+  z_stream strm;
+  memset (&strm, 0, sizeof (strm));
+  assert (inflateInit2 (&strm, 16 + MAX_WBITS) == Z_OK);
+  strm.avail_in = ilen;
+  strm.next_in = input;
+  strm.avail_out = olen ;
+  strm.next_out = output;
+  int err = inflate (&strm, Z_FINISH), total_out = 0;
+  if (err == Z_OK || err == Z_STREAM_END) {
+    total_out = (int) strm.total_out;
+    if (err == Z_STREAM_END && verbosity >= 2) {
+      logprintf ( "inflated %d bytes\n", (int) strm.total_out);
+    }
+  }
+  if (verbosity && err != Z_STREAM_END) {
+    logprintf ( "inflate error = %d\n", err);
+    logprintf ( "inflated %d bytes\n", (int) strm.total_out);
+  }
+  inflateEnd (&strm);
+  return total_out;
+}
diff --git a/tools.h b/tools.h
index 66c6d96..d6cbeca 100644
--- a/tools.h
+++ b/tools.h
@@ -24,6 +24,7 @@ void *talloc (size_t size);
 void *trealloc (void *ptr, size_t old_size, size_t size);
 void *talloc0 (size_t size);
 char *tstrdup (const char *s);
+int tinflate (void *input, int ilen, void *output, int olen);
 void ensure (int r);
 void ensure_ptr (void *p);