fix compilation error on Visual Studio 2013 and earlier

- fix compilation error about "inline"
  - fix linker error about "_TIFF_snprintf_f"

3rdparty/libtiff/CMakeLists.txt

@@ -34,9 +34,6 @@ if(NOT MSVC)
   check_include_file(unistd.h    HAVE_UNISTD_H)
 endif()
 
-if(MSVC)
-  set(INLINE_KEYWORD "inline")
-else()
 # Inspired from /usr/share/autoconf/autoconf/c.m4
 foreach(inline_keyword "inline" "__inline__" "__inline")
   if(NOT DEFINED C_INLINE)
@@ -59,7 +56,6 @@ else()
 if(NOT DEFINED C_INLINE)
   set(INLINE_KEYWORD)
 endif()
-endif()
 
 
 # Check type sizes
@@ -413,6 +409,7 @@ set(lib_srcs
     tif_write.c
     tif_zip.c
     tif_stream.cxx
+	snprintf.c
     t4.h
     tif_dir.h
     tif_fax3.h

3rdparty/libtiff/snprintf.c

@@ -0,0 +1,38 @@
+/**
+ * Workaround for lack of snprintf(3) in Visual Studio.  See
+ * http://stackoverflow.com/questions/2915672/snprintf-and-visual-studio-2010/8712996#8712996
+ * It's a trivial wrapper around the builtin _vsnprintf_s and
+ * _vscprintf functions.
+ */
+
+#ifdef _MSC_VER
+
+#include <stdio.h>
+#include <stdarg.h>
+
+int _TIFF_vsnprintf_f(char* str, size_t size, const char* format, va_list ap)
+{
+  int count = -1;
+
+  if (size != 0)
+    count = _vsnprintf_s(str, size, _TRUNCATE, format, ap);
+  if (count == -1)
+    count = _vscprintf(format, ap);
+
+  return count;
+}
+
+int _TIFF_snprintf_f(char* str, size_t size, const char* format, ...)
+{
+  int count;
+  va_list ap;
+
+  va_start(ap, format);
+  count = vsnprintf(str, size, format, ap);
+  va_end(ap);
+
+  return count;
+}
+
+#endif // _MSC_VER
+