libjava/gnu/gcj/natCore.cc

   1 // natCore -- C++ side of Core
   2
   3 /* Copyright (C) 2001, 2002, 2003  Free Software Foundation
   4
   5    This file is part of libgcj.
   6
   7 This software is copyrighted work licensed under the terms of the
   8 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
   9 details.  */
  10
  11 /* Author: Anthony Green <green@redhat.com>.  */
  12
  13 #include <config.h>
  14
  15 #include <gcj/cni.h>
  16 #include <jvm.h>
  17 #include <string.h>
  18 #include <stdlib.h>
  19
  20 #include <java/lang/NullPointerException.h>
  21 #include <java/io/IOException.h>
  22 #include <gnu/gcj/Core.h>
  23
  24 // List of global core values.
  25 static _Jv_core_chain *root;
  26
  27 static void
  28 default_register_resource (_Jv_core_chain *node)
  29 {
  30   node->next = root;
  31   root = node;
  32 }
  33
  34 // This is set only when a lock is held on java.lang.Class.
  35 // This function is called to handle a new core node.
  36 void (*_Jv_RegisterCoreHook) (_Jv_core_chain *) = default_register_resource;
  37
  38 void
  39 _Jv_RegisterResource (void *vptr)
  40 {
  41   char *rptr = (char *) vptr;
  42
  43   _Jv_core_chain *cc = (_Jv_core_chain *) _Jv_Malloc (sizeof (_Jv_core_chain));
  44
  45   cc->name_length = ((int *)rptr)[0];
  46   cc->data_length = ((int *)rptr)[1];
  47   cc->name = rptr + 2 * sizeof (int);
  48   cc->data = cc->name + cc->name_length;
  49   cc->next = NULL;
  50
  51   (*_Jv_RegisterCoreHook) (cc);
  52 }
  53
  54 void
  55 _Jv_FreeCoreChain (_Jv_core_chain *chain)
  56 {
  57   while (chain != NULL)
  58     {
  59       _Jv_core_chain *next = chain->next;
  60       _Jv_Free (chain);
  61       chain = next;
  62     }
  63 }
  64
  65 _Jv_core_chain *
  66 _Jv_FindCore (_Jv_core_chain *node, jstring name)
  67 {
  68   char *buf = (char *) __builtin_alloca (JvGetStringUTFLength (name) + 1);
  69   jsize total = JvGetStringUTFRegion (name, 0, name->length(), buf);
  70   buf[total] = '\0';
  71
  72   // Usually requests here end up as an absolute URL.  We strip the
  73   // initial `/'.
  74   if (buf[0] == '/')
  75     {
  76       ++buf;
  77       --total;
  78     }
  79
  80   while (node)
  81     {
  82       if (total == node->name_length
  83           && strncmp (buf, node->name, total) == 0)
  84         return node;
  85       node = node->next;
  86     }
  87
  88   return NULL;
  89 }
  90
  91 gnu::gcj::Core *
  92 _Jv_create_core (_Jv_core_chain *node, jstring name)
  93 {
  94   node = _Jv_FindCore (node, name);
  95
  96   gnu::gcj::Core *core = NULL;
  97   if (node)
  98     {
  99       core = (gnu::gcj::Core *) _Jv_AllocObject(&gnu::gcj::Core::class$,
 100                                                 sizeof (gnu::gcj::Core));
 101       core->ptr = (gnu::gcj::RawData *) node->data;
 102       core->length = node->data_length;
 103     }
 104   return core;
 105 }
 106
 107 gnu::gcj::Core *
 108 gnu::gcj::Core::create (jstring name)
 109 {
 110   gnu::gcj::Core *core = _Jv_create_core (root, name);
 111   if (core == NULL)
 112     throw new java::io::IOException (JvNewStringLatin1 ("can't open core"));
 113   return core;
 114 }