libjava/java/net/natVMURLConnection.cc

   1 /* Copyright (C) 2006, 2007  Free Software Foundation
   2
   3    This file is part of libgcj.
   4
   5 This software is copyrighted work licensed under the terms of the
   6 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
   7 details.  */
   8
   9 #include <config.h>
  10
  11 #include <java/net/VMURLConnection.h>
  12 #include <gcj/cni.h>
  13 #include <java/lang/UnsupportedOperationException.h>
  14 #include <stdio.h>
  15
  16 #if defined (HAVE_MAGIC_H) && defined (USE_LTDL)
  17
  18 #include <magic.h>
  19 #include <ltdl.h>
  20
  21 static magic_t cookie;
  22
  23 static magic_t (*p_magic_open)(int flags);
  24 static int (*p_magic_load)(magic_t cookie, const char *filename);
  25 static void (*p_magic_close)(magic_t cookie);
  26 static const char * (*p_magic_buffer) (magic_t cookie, const void *buffer,
  27                                        size_t length);
  28
  29 #endif /* HAVE_MAGIC_H && defined (USE_LTDL) */
  30
  31 void
  32 java::net::VMURLConnection::init ()
  33 {
  34 #if defined (HAVE_MAGIC_H) && defined (USE_LTDL)
  35   lt_dlhandle handle = lt_dlopenext ("libmagic.so");
  36   if (!handle)
  37     return;
  38
  39   p_magic_open = (typeof (p_magic_open))lt_dlsym(handle, "magic_open");
  40   if (p_magic_open == NULL)
  41     return;
  42   p_magic_buffer = (typeof (p_magic_buffer))lt_dlsym(handle, "magic_buffer");
  43   if (p_magic_buffer == NULL)
  44     return;
  45   p_magic_close = (typeof (p_magic_close))lt_dlsym(handle, "magic_close");
  46   if (p_magic_close == NULL)
  47     return;
  48   p_magic_load = (typeof (p_magic_load))lt_dlsym(handle, "magic_load");
  49   if (p_magic_load == NULL)
  50     return;
  51
  52   cookie = p_magic_open (MAGIC_MIME);
  53   if (cookie == (magic_t) NULL)
  54     return;
  55   if (p_magic_load (cookie, NULL) == -1)
  56     {
  57       p_magic_close (cookie);
  58       cookie = (magic_t) NULL;
  59     }
  60 #endif /* HAVE_MAGIC_H  && defined (USE_LTDL) */
  61 }
  62
  63 ::java::lang::String *
  64 java::net::VMURLConnection::guessContentTypeFromBuffer (jbyteArray bytes,
  65                                                         jint valid)
  66 {
  67 #if defined (HAVE_MAGIC_H) && defined (USE_LTDL)
  68   const char *result;
  69
  70   if (cookie == (magic_t) NULL)
  71     return NULL;
  72
  73   result = p_magic_buffer (cookie, elements(bytes), valid);
  74
  75   if (result == NULL)
  76     return NULL;
  77   return _Jv_NewStringUTF (result);
  78 #else
  79   return NULL;
  80 #endif /* HAVE_MAGIC_H  && defined (USE_LTDL) */
  81 }